QB/T 2148-1995 Zigzag sewing machine heads for industrial sewing machines
Some standard content:
Light Industry Standard of the People's Republic of China
Industrial Sewing Machine
1 Subject Content and Scope of Application
Zigzag Sewing Machine Head
QB/T 2148-1995
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of zigzag sewing machine heads.
This standard applies to zigzag sewing machine heads (hereinafter referred to as "heads") that sew 301, 304, 308.321, 322 double-thread lockstitch stitches and are equipped with automatic oiling.
2 reference standards
GB/T 2828
GB/T 2829
GB/T4515
GB/T4516
GB/T4517
GB/T4518
QB/T1177
QB/T1178
ZBY 17004
ZBY 17023
3 Product classification
3.1 Type
Count sampling procedure and sampling table for batch inspection (applicable to inspection of continuous batches)Count sampling procedure and sampling table for periodic inspection (applicable to inspection of stability of production process)Classification and terminology of stitches
Test method for seam thickness ability of household sewing machines
Test method for feeding direction stability of household sewing machinesTest method for creep amount of feeding layer of household sewing machinesTest method for noise level
Industrial sewing machines
Industrial sewing machines
Test method for vibration
Sewing machine packaging
Test method for starting torque of sewing machine head
This machine is a flat-plate body, which adopts connecting rod thread taking-up, needle bar swing, rotary hook thread hook and bottom feeding to form 301, 304 and other stitches (GB/T 4515).
3.2 Basic parameters
Maximum sewing speed
Straight seam: not less than 3500 stitches/min, curved seam: not less than 3200 stitches/min: Single curved seam (including 2-point, 3-point, 4-point stitch): 3200 stitches/min; Maximum stitch length: not less than 4mm;
Maximum stitch width: not less than 6mm;
Presser foot lifting height: manual control not less than 6mm, knee control not less than 10mm; Seam thickness can Force: not less than 8 layers of yarn khaki;
Needle: GCX5 type Nm70~120;
Thread: 14.5tex/3sz~～5.9tex/3sz (40°/3~～100°/3) cotton thread or similar polyester thread and silk thread, etc.; Lubricating oil: No. 2 special white oil or No. 7 high-speed oil, approved by China Light Industry General Association on October 24, 1995
Implementation on June 1, 1996
Motor power: 370W.
3.3 The structural dimensions shall comply with the provisions of Table 1. Part
Rounded corner where length and width meet
Left to hinge hole
Hinge hole distance
4 Technical requirements
4.1 Appearance quality
QB/T2148—1995
Basic dimensions
-i KAoNni KAca-
Limit deviation
4.1.1 The surface of the baking varnish should be flat and uniform in color. The main visible parts should not have obvious defects such as paint flow, bubbles and paint contact. 4.1.2 There should be no rust on the surface of the machine head. The trademark, nameplate and decals should be complete and correctly positioned without obvious scars, stains and broken flowers. 4.1.3 There should be no burrs on the exposed parts of the machine head. 4.1.4 The surface of the electroplated layer should be flat and smooth, with basically uniform color, and should not have defects such as rust, peeling, bubbles, spots, scratches, etc. 4.1.5 The surface color of the blackened parts shall be uniform, and there shall be no blanks, spots, sediment spots and scratches. 4.2 Machine performance
4.2.1 The maximum sewing speed shall comply with the provisions of Article 3.2a of this standard. 4.2.2 The maximum stitch length and width shall comply with the provisions of Articles 3.2b and C of this standard. 4.2.3
The stitch length, width, presser foot pressure, and needle and shuttle thread tension shall be flexible to adjust and have reliable performance. 4.2.4 After the presser foot is lifted, it shall play a role in loosening the thread. 4.2.5 When the stitch length is the largest, the starting pressure of the reverse feed wrench shall not exceed 20N, and the reverse feed wrench shall be reset by pressing and releasing it. 4.2. 6
When feeding forward and backward, the stitch length shall be basically consistent, and the relative error shall not exceed 15%. The feeding direction shall be stable and smooth, and shall comply with the provisions of GB/T4517. Its P. and P values shall not exceed 5mm. 4.2.8 When the stitch width is at its maximum, the offset relative to the left and right base points should not exceed 0.3mm. 4.3 Sewing performance
4.3.1 When sewing at high speed 3500 stitches/min and low speed 1500 stitches/min, the stitch length and width should be basically consistent, and the relative error should not exceed 15%.
4.3.2 Within a length of 500mm, the amount of creep of the sewing material layer should not exceed 5mm. 4.3.3 There should be no break or skipped stitches in 5m of continuous sewing of straight seams and 2m of continuous sewing of curved seams. 4.3.4 When sewing medium and thick materials with straight stitches, when the stitch length changes within the range of 1.5 to 3mm, the thread clamp should be adjusted to the same position, and there should be no skipped stitches, thread breakage or floating thread.
4.3.5 There should be no skipped stitches, thread breakage or floating thread when sewing layers. 4.3.6 There should be no break, thread breakage or skipped stitches when sewing thick materials. 4.4 Operation performance
4.4.1 Operation noise
a. When operating continuously at the highest speed, there should be no abnormal noise; b. During routine inspection, the noise sound pressure level should not exceed 85dB(A). 4.4.2 Vibration displacement should not exceed 300μm. 4.4.3 Starting torque should meet the following requirements:376
a. Straight needle trace: not more than 0.7N·m;
b. Curved needle trace: not more than 0.9Nm.
QB/T2148-1995
4.4.4 When the machine head is running, the oil supply and return of the lubrication system should be good, and there should be no oil leakage on the joint surfaces. 4.5 Accessories and spare parts
Each machine head should be provided with the types and quantities of accessories and spare parts specified in the instruction manual or packing list, not less than the specified number. 5 Inspection method
5.1 Appearance quality inspection
The appearance quality specified in Article 4.1 of this standard shall be inspected by visual inspection at a distance of 300mm under an environment with a natural light illumination of 600±2001x.
5.2 Machine performance inspection
5.2.1 The sewing speed specified in Article 2.1 of this standard shall be measured by a photoelectric tachometer or other non-contact tachometer. 5.2.2 The maximum stitch length and width specified in Article 4.2.2 of this standard shall be inspected in accordance with the provisions of No. 4 in Table 2. 5.2.3 The adjustment of stitch length, width, presser foot pressure and thread tension specified in Article 4.2.3 of this standard shall be inspected in accordance with the provisions of No. 4 in Table 2.
5.2.4 Thread loosening inspection specified in Article 4.2.4 of this standard The thread take-up lever of the machine head to be inspected is at the highest point, and the hanging mass after one end of the needle and thread passes through all thread-passing parts is 50g, and the presser foot is lowered;. Wrap the other end of the needle and thread around the auxiliary thread clamp several times and fix it: C. Lift the presser foot and cut the needle and thread with scissors. The foot will fall down automatically if it is qualified. 5.2.5 The starting pressure test of the reverse feed wrench specified in 4.2.5 of this standard a. Press the spring scale against the end of the reverse feed wrench, slowly apply force to read the pressure value when the reverse feed wrench starts to move. The pressure value should be no more than 20N to be qualified:
b. Remove the reverse feed wrench, and the reverse feed wrench should be able to reset automatically as it is relaxed. It is qualified if it is not stuck. 5.2.6 The relative error of the length of the reverse and forward feed stitch specified in 4.2.6 of this standard shall be tested according to the provisions of No. 8 in Table 2. 5.2.7 The feeding direction stability specified in 4.2.7 of this standard shall be tested according to the provisions of No. 7 in Table 2. 5.2.8 This standard promotes the offset inspection group specified in 4.2.8, adjust the stitch width to the maximum
b. Move the needle to the left base point, turn the wheel to make the needle tip drop to 5mm away from the upper plane of the needle plate: c. The blade-type contact of the dial indicator points to the needle bar 2mm below the plane of the high head panel, and adjust the pointer of the dial indicator to zero;, turn the upper wheel again to make the needle move vertically back and forth, when the needle tip rises to the original position 5mm away from the plane of the needle plate, at this time, the difference in the dial indicator is the left base point offset:
e. Use the above method to measure again at the right base point position and read the right base point offset; f. The largest offset between the left and right base points is the offset of the machine. 5.3 Sewing performance test
The sewing performance test specified in 4.3 of this standard should first clean the surface of the machine head, remove dirt from the needle plate, feed dog, hook and thread passing parts, add appropriate amount of lubricating oil and run for 5 minutes, then test each item according to the conditions specified in Table 2. 5.4 Running performance test
5.4.1 The test of no abnormal noise specified in 4.4.1a of this standard shall be judged by listening. 5.4.2 4.4.The sound pressure level test specified in 1b shall be carried out according to the test method specified in QB/T1177. 5.4.3 The perturbation displacement test specified in 4.4.2 of this standard shall be carried out according to the test method specified in QB/T1178. 5.4.4 The starting torque test shall be carried out according to the test method specified in ZBY17023. 5.4.5 Inspection of oil supply, oil return and oil leakage as specified in 4.4.4 of this standard. Inspection of oil supply and oil return
-iiiKAoNiKAca-
001×Relevant number (%) Concentrated practical
01（%)
0090018
0008000
00s1~00
uu/Special
09X008
09×009
Industry base station
000881
(22/01
2s2/00 )
z/xa6s
919909
（97）
QB/T2148—1995
Run at 90% of the maximum sewing speed for 1 minute, visually check the continuous oil supply in the oil window, and after running, remove the panel to check the oil return; b. Oil leakage inspection
After the sewing performance test, visually inspect the needle bar swing frame oil-proof sleeve, the lower section of the swing frame needle bar, the clamping rod sleeve, the upper shaft rear shaft sleeve, the upper cover, the upper cover oil cover, the panel, the rear cover, the reverse wrench shaft, the horizontal needle cover plate, and the stitch adjustment screw. There should be no oil leakage, and the sewing material should be free of oil stains. 5.5 Inspection of accessories and spare parts specified in 4.6 of this standard Check the accessories and spare parts according to the types and quantities specified in the product manual or packing list, and the quantity should not be less than the specified quantity. 6 Inspection rules
Inspection items, quality characteristic classification and inspection classification are shown in Table 3. Table 3
Inspection items
Appearance quality
Machine performance
Sewing performance
Operation performance
Accessories and spare parts
4.1.1 Quality of baking varnish
Inspection strip
4.1.2 Quality of machine head surface
4.1.3 Quality of exposed parts
4.1.4 Quality of electroplated parts
4.1.5 Quality of blackened parts
4.2.1 Maximum sewing speed
4.2.2 Maximum stitch length and width
4.2.3 Adjustment of each mechanism
4.2.4 Loose thread effect
4.2.5 Wrench starting force
4.2.6 Error in forward and reverse stitch length
4. 2. 7 Feeding direction stability
4.2.8 Offset platewww.bzxz.net
4.3.1 Relative error of stitch length and width
4.3.2 Creep
4.3.3 Continuous sewing
4.3. 4 Sewing of medium-thick materials
4.3.5 Layer seams
4.3.6 Seam thickness
No abnormal noise
Noise level dB(A)
4.4.2 Vibration displacement
No jamming
Starting torque Nm
4.4.4 Oil supply, oil return, oil leakage
4. 5 Accessories and spare parts
Classification of quality characteristics
Inspection classification
—1995
QB/T 2148
iiiKAoNiKAca-
6.1 The machine head must be inspected and qualified by the inspection department before it can leave the factory, and it must be accompanied by an inspection certificate and a continuous stitch sample with a size of 100mm X 30mm.
6.2 Inspection classification
Product inspection is divided into two categories: factory inspection and type inspection. 6.2.1 Factory inspection
When the product is delivered, it must be inspected. The inspection rules and items shall be in accordance with the factory inspection regulations. The consignee has the right to accept the product according to the factory inspection items specified in this standard. 6.2.2 Type inspection
If one of the following situations occurs, a comprehensive assessment of product quality is required and a type inspection should be carried out. a. Trial determination and identification of new products or old products transferred to the factory for production; b. After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c. During normal production, periodic inspection should be carried out once every 3 months; d. When the product is resumed after a long period of suspension; e. When the results of the final inspection are significantly different from the last type inspection; f. When the superior quality supervision agency proposes a request for type inspection. 6.2.3 Product quality characteristics and inspection classification
According to the severity of the non-conformity of product quality characteristics, it is divided into Class B unqualified and Class C unqualified. 6.3 Factory inspection rules
6.3.1 Sample selection
Samples should be randomly selected from the submitted inspection batches. 6.3.2 Inspection level, sampling plan, qualified quality level and sample size shall be as specified in Table 4. Table 4
Inspection level
Sampling plan
Non-conformity classification
Number of unit sample inspection items
Qualified quality level (AQL)
Batch range
26~150
151～1200
Sample size letter
Note: (①Unit sample is each machine head; Sample size
②A., R. Determination number regulations: Class B is counted by the number of non-conforming products, and Class C is counted by the number of non-conforming products. 6.3.3 Judgment of qualified or unqualified inspection batch B
Normal inspection once Sampling
According to the results of sample inspection, if the number of Class B non-conforming products and Class C non-conforming products found in the sample are less than or equal to the corresponding qualified judgment number (A.), then the inspection batch is judged to be a qualified batch. If the number of Class B non-conforming products and Class C non-conforming products found in the sample are greater than or equal to the corresponding non-conforming judgment number (R.), then the inspection batch is judged to be a non-conforming batch. 6.3.4 The disposal of non-conforming products and batches after inspection shall comply with the provisions of Article 4.12 of GB/T2828.
6.4 Type inspection
6.4.1 Sampling
QB/T 2148--1995
The samples shall be drawn from a batch or several batches manufactured in this cycle and qualified by factory inspection, and it shall be ensured that the obtained samples can represent the manufacturing technology level of this cycle.
6.4.2 The discrimination level, sampling plan, unqualified quality level and sample size shall be as specified in Table 5. Table 5
Inspection level
Sampling plan
Unqualified classification
Number of sample unit inspection items
Unqualified quality level (RQL)
Note: ①The unit sample is each machine head.
Sample size
②Ac, R. Provisions for the judgment number: Class B is counted by the number of unqualified products, and Class C is counted by the number of unqualified products. 6.4.3 Judgment of qualified or unqualified type inspection B
Normal inspection secondary sampling
According to the results of the sample inspection, if Class B is found in the first sample, If the number of defective products and the number of Class C defective products are both less than or equal to the corresponding first determination number (A), the batch is judged to be a qualified batch. If the number of Class B defective products and the number of Class C defective products in the sample are found to be greater than or equal to the corresponding first defective determination number (R.), the batch is judged to be a defective batch. If the number of defective products or defective numbers found in the first sample, one or more categories are greater than the corresponding first qualified determination number (A), and at the same time are less than the corresponding first defective determination number (R.), then a second sample is drawn for inspection. If the sum of the number of Class B defective products and the sum of the number of Class C defective products found in the second sample are both less than or equal to the corresponding second qualified determination number (A.), the batch is judged to be a qualified batch. If the sum of the number of Class B defective products or the sum of the number of Class C defective products found in the first and second samples is greater than or equal to the corresponding second defective determination number (R), the batch is judged to be a defective batch. 6.4.4 Disposal after type inspection
According to Article 4.12 of GB/T2829.
7 Marking, packaging, transportation, storage
7.1 Marking
The machine head should have the following markings:
a. Product model, name, specification;
b. Trademark;
c. Manufacturer's name,
d. Manufacturing date or number.
7.2 Packaging, transportation, storage
According to the provisions of ZBY17004.
Additional remarks:
This standard is proposed by the Quality Standards Department of China Light Industry General Association. This standard is under the jurisdiction of the National Sewing Machine Standardization Center. This standard was drafted by Shanghai Xiechang Sewing Machine Factory, Nanjing 513 Factory, Shanghai Sewing Machine Factory No. 1, and Wuhan Garment Machinery Factory. The main drafters of this standard are Chen Jialian, He Zhaoxu, Li Meidi and Ma Rujie.2 The perturbation displacement test specified in this standard shall be carried out according to the test method specified in QB/T1178. 5.4.4 The starting torque test shall be carried out according to the test method specified in ZBY17023. 5.4.5 The oil supply, oil return and oil leakage test specified in 4.4.4 of this standard. Oil supply and oil leakage test
-iiiKAoNiKAca-
001×Image number (%) Concentrated practical
01（%)
0090018
0008000
00s1~00
uu/Special
09X008
09×009
Industry Bentai
000881
(22/01
2s2/00 )
z/xa6s
919909
（97）
QB/T2148—1995
Run at 90% of the maximum sewing speed for 1 minute, visually check the continuous oil supply in the oil window, and after running, remove the panel to check the oil return; b. Oil leakage inspection
After the sewing performance test, visually inspect the needle bar swing frame oil-proof sleeve, the lower section of the swing frame needle bar, the clamping rod sleeve, the upper shaft rear shaft sleeve, the upper cover, the upper cover oil cover, the panel, the rear cover, the reverse wrench shaft, the horizontal needle cover plate, and the stitch adjustment screw. There should be no oil leakage, and the sewing material should be free of oil stains. 5.5 Inspection of accessories and spare parts specified in 4.6 of this standard Check the accessories and spare parts according to the types and quantities specified in the product manual or packing list, and the quantity should not be less than the specified quantity. 6 Inspection rules
Inspection items, quality characteristic classification and inspection classification are shown in Table 3. Table 3
Inspection items
Appearance quality
Machine performance
Sewing performance
Operation performance
Accessories and spare parts
4.1.1 Quality of baking varnish
Inspection strip
4.1.2 Quality of machine head surface
4.1.3 Quality of exposed parts
4.1.4 Quality of electroplated parts
4.1.5 Quality of blackened parts
4.2.1 Maximum sewing speed
4.2.2 Maximum stitch length and width
4.2.3 Adjustment of each mechanism
4.2.4 Loose thread effect
4.2.5 Wrench starting force
4.2.6 Error in forward and reverse stitch length
4. 2. 7 Feeding direction stability
4.2.8 Offset plate
4.3.1 Relative error of stitch length and width
4.3.2 Creep
4.3.3 Continuous sewing
4.3. 4 Sewing of medium-thick materials
4.3.5 Layer seams
4.3.6 Seam thickness
No abnormal noise
Noise level dB(A)
4.4.2 Vibration displacement
No jamming
Starting torque Nm
4.4.4 Oil supply, oil return, oil leakage
4. 5 Accessories and spare parts
Classification of quality characteristics
Inspection classification
—1995
QB/T 2148
iiiKAoNiKAca-
6.1 The machine head must be inspected and qualified by the inspection department before it can leave the factory, and it must be accompanied by an inspection certificate and a continuous stitch sample with a size of 100mm X 30mm.
6.2 Inspection classification
Product inspection is divided into two categories: factory inspection and type inspection. 6.2.1 Factory inspection
When the product is delivered, it must be inspected. The inspection rules and items shall be in accordance with the factory inspection regulations. The consignee has the right to accept the product according to the factory inspection items specified in this standard. 6.2.2 Type inspection
If one of the following situations occurs, a comprehensive assessment of product quality is required and a type inspection should be carried out. a. Trial determination and identification of new products or old products transferred to the factory for production; b. After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c. During normal production, periodic inspection should be carried out once every 3 months; d. When the product is resumed after a long period of suspension; e. When the results of the final inspection are significantly different from the last type inspection; f. When the superior quality supervision agency proposes a request for type inspection. 6.2.3 Product quality characteristics and inspection classification
According to the severity of the non-conformity of product quality characteristics, it is divided into Class B unqualified and Class C unqualified. 6.3 Factory inspection rules
6.3.1 Sample selection
Samples should be randomly selected from the submitted inspection batches. 6.3.2 Inspection level, sampling plan, qualified quality level and sample size shall be as specified in Table 4. Table 4
Inspection level
Sampling plan
Non-conformity classification
Number of unit sample inspection items
Qualified quality level (AQL)
Batch range
26~150
151～1200
Sample size letter
Note: (①Unit sample is each machine head; Sample size
②A., R. Determination number regulations: Class B is counted by the number of non-conforming products, and Class C is counted by the number of non-conforming products. 6.3.3 Judgment of qualified or unqualified inspection batch B
Normal inspection once Sampling
According to the results of sample inspection, if the number of Class B non-conforming products and Class C non-conforming products found in the sample are less than or equal to the corresponding qualified judgment number (A.), then the inspection batch is judged to be a qualified batch. If the number of Class B non-conforming products and Class C non-conforming products found in the sample are greater than or equal to the corresponding non-conforming judgment number (R.), then the inspection batch is judged to be a non-conforming batch. 6.3.4 The disposal of non-conforming products and batches after inspection shall comply with the provisions of Article 4.12 of GB/T2828.
6.4 Type inspection
6.4.1 Sampling
QB/T 2148--1995
The samples shall be drawn from a batch or several batches manufactured in this cycle and qualified by factory inspection, and it shall be ensured that the obtained samples can represent the manufacturing technology level of this cycle.
6.4.2 The discrimination level, sampling plan, unqualified quality level and sample size shall be as specified in Table 5. Table 5
Inspection level
Sampling plan
Unqualified classification
Number of sample unit inspection items
Unqualified quality level (RQL)
Note: ①The unit sample is each machine head.
Sample size
②Ac, R. Provisions for the judgment number: Class B is counted by the number of unqualified products, and Class C is counted by the number of unqualified products. 6.4.3 Judgment of qualified or unqualified type inspection B
Normal inspection secondary sampling
According to the results of the sample inspection, if Class B is found in the first sample, If the number of defective products and the number of Class C defective products are both less than or equal to the corresponding first determination number (A), the batch is judged to be a qualified batch. If the number of Class B defective products and the number of Class C defective products in the sample are found to be greater than or equal to the corresponding first defective determination number (R.), the batch is judged to be a defective batch. If the number of defective products or defective numbers found in the first sample is one or more categories greater than the corresponding first qualified determination number (A), and at the same time less than the corresponding first defective determination number (R.), a second sample is drawn for inspection. If the sum of the number of Class B defective products and the sum of the number of Class C defective products found in the second sample are both less than or equal to the corresponding second qualified determination number (A.), the batch is judged to be a qualified batch. If the sum of the number of Class B defective products or the sum of the number of Class C defective products found in the first and second samples is greater than or equal to the corresponding second defective determination number (R), the batch is judged to be a defective batch. 6.4.4 Disposal after type inspection
According to Article 4.12 of GB/T2829.
7 Marking, packaging, transportation, storage
7.1 Marking
The machine head should have the following markings:
a. Product model, name, specification;
b. Trademark;
c. Manufacturer's name,
d. Manufacturing date or number.
7.2 Packaging, transportation, storage
According to the provisions of ZBY17004.
Additional remarks:
This standard is proposed by the Quality Standards Department of China Light Industry Association. This standard is under the jurisdiction of the National Sewing Machine Standardization Center. This standard was drafted by Shanghai Xiechang Sewing Machine Factory, Nanjing 513 Factory, Shanghai Sewing Machine Factory No. 1, and Wuhan Garment Machinery Factory. The main drafters of this standard are Chen Jialian, He Zhaoxu, Li Meidi and Ma Rujie.2 The perturbation displacement test specified in this standard shall be carried out according to the test method specified in QB/T1178. 5.4.4 The starting torque test shall be carried out according to the test method specified in ZBY17023. 5.4.5 The oil supply, oil return and oil leakage test specified in 4.4.4 of this standard. Oil supply and oil leakage test
-iiiKAoNiKAca-
001×Image number (%) Concentrated practical
01（%)
0090018
0008000
00s1~00
uu/Special
09X008
09×009
Industry Bentai
000881
(22/01
2s2/00 )
z/xa6s
919909
（97）
QB/T2148—1995
Run at 90% of the maximum sewing speed for 1 minute, visually check the continuous oil supply in the oil window, and after running, remove the panel to check the oil return; b. Oil leakage inspection
After the sewing performance test, visually inspect the needle bar swing frame oil-proof sleeve, the lower section of the swing frame needle bar, the clamping rod sleeve, the upper shaft rear shaft sleeve, the upper cover, the upper cover oil cover, the panel, the rear cover, the reverse wrench shaft, the horizontal needle cover plate, and the stitch adjustment screw. There should be no oil leakage, and the sewing material should be free of oil stains. 5.5 Inspection of accessories and spare parts specified in 4.6 of this standard Check the accessories and spare parts according to the types and quantities specified in the product manual or packing list, and the quantity should not be less than the specified quantity. 6 Inspection rules
Inspection items, quality characteristic classification and inspection classification are shown in Table 3. Table 3
Inspection items
Appearance quality
Machine performance
Sewing performance
Operation performance
Accessories and spare parts
4.1.1 Quality of baking varnish
Inspection strip
4.1.2 Quality of machine head surface
4.1.3 Quality of exposed parts
4.1.4 Quality of electroplated parts
4.1.5 Quality of blackened parts
4.2.1 Maximum sewing speed
4.2.2 Maximum stitch length and width
4.2.3 Adjustment of each mechanism
4.2.4 Loose thread effect
4.2.5 Wrench starting force
4.2.6 Error in forward and reverse stitch length
4. 2. 7 Feeding direction stability
4.2.8 Offset plate
4.3.1 Relative error of stitch length and width
4.3.2 Creep
4.3.3 Continuous sewing
4.3. 4 Sewing of medium-thick materials
4.3.5 Layer seams
4.3.6 Seam thickness
No abnormal noise
Noise level dB(A)
4.4.2 Vibration displacement
No jamming
Starting torque Nm
4.4.4 Oil supply, oil return, oil leakage
4. 5 Accessories and spare parts
Classification of quality characteristics
Inspection classification
—1995
QB/T 2148
iiiKAoNiKAca-
6.1 The machine head must be inspected and qualified by the inspection department before it can leave the factory, and it must be accompanied by an inspection certificate and a continuous stitch sample with a size of 100mm X 30mm.
6.2 Inspection classification
Product inspection is divided into two categories: factory inspection and type inspection. 6.2.1 Factory inspection
When the product is delivered, it must be inspected. The inspection rules and items shall be in accordance with the factory inspection regulations. The consignee has the right to accept the product according to the factory inspection items specified in this standard. 6.2.2 Type inspection
If one of the following situations occurs, a comprehensive assessment of product quality is required and a type inspection should be carried out. a. Trial determination and identification of new products or old products transferred to the factory for production; b. After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c. During normal production, periodic inspection should be carried out once every 3 months; d. When the product is resumed after a long period of suspension; e. When the results of the final inspection are significantly different from the last type inspection; f. When the superior quality supervision agency proposes a request for type inspection. 6.2.3 Product quality characteristics and inspection classification
According to the severity of the non-conformity of product quality characteristics, it is divided into Class B unqualified and Class C unqualified. 6.3 Factory inspection rules
6.3.1 Sample selection
Samples should be randomly selected from the submitted inspection batches. 6.3.2 Inspection level, sampling plan, qualified quality level and sample size shall be as specified in Table 4. Table 4
Inspection level
Sampling plan
Non-conformity classification
Number of unit sample inspection items
Qualified quality level (AQL)
Batch range
26~150
151～1200
Sample size letter
Note: (①Unit sample is each machine head; Sample size
②A., R. Determination number regulations: Class B is counted by the number of non-conforming products, and Class C is counted by the number of non-conforming products. 6.3.3 Judgment of qualified or unqualified inspection batch B
Normal inspection once Sampling
According to the results of sample inspection, if the number of Class B non-conforming products and Class C non-conforming products found in the sample are less than or equal to the corresponding qualified judgment number (A.), then the inspection batch is judged to be a qualified batch. If the number of Class B non-conforming products and Class C non-conforming products found in the sample are greater than or equal to the corresponding non-conforming judgment number (R.), then the inspection batch is judged to be a non-conforming batch. 6.3.4 The disposal of non-conforming products and batches after inspection shall comply with the provisions of Article 4.12 of GB/T2828.
6.4 Type inspection
6.4.1 Sampling
QB/T 2148--1995
The samples shall be drawn from a batch or several batches manufactured in this cycle and qualified by factory inspection, and it shall be ensured that the obtained samples can represent the manufacturing technology level of this cycle.
6.4.2 The discrimination level, sampling plan, unqualified quality level and sample size shall be as specified in Table 5. Table 5
Inspection level
Sampling plan
Unqualified classification
Number of sample unit inspection items
Unqualified quality level (RQL)
Note: ①The unit sample is each machine head.
Sample size
②Ac, R. Provisions for the judgment number: Class B is counted by the number of unqualified products, and Class C is counted by the number of unqualified products. 6.4.3 Judgment of qualified or unqualified type inspection B
Normal inspection secondary sampling
According to the results of the sample inspection, if Class B is found in the first sample, If the number of defective products and the number of Class C defective products are both less than or equal to the corresponding first determination number (A), the batch is judged to be a qualified batch. If the number of Class B defective products and the number of Class C defective products in the sample are found to be greater than or equal to the corresponding first defective determination number (R.), the batch is judged to be a defective batch. If the number of defective products or defective numbers found in the first sample is one or more categories greater than the corresponding first qualified determination number (A), and at the same time less than the corresponding first defective determination number (R.), a second sample is drawn for inspection. If the sum of the number of Class B defective products and the sum of the number of Class C defective products found in the second sample are both less than or equal to the corresponding second qualified determination number (A.), the batch is judged to be a qualified batch. If the sum of the number of Class B defective products or the sum of the number of Class C defective products found in the first and second samples is greater than or equal to the corresponding second defective determination number (R), the batch is judged to be a defective batch. 6.4.4 Disposal after type inspection
According to Article 4.12 of GB/T2829.
7 Marking, packaging, transportation, storage
7.1 Marking
The machine head should have the following markings:
a. Product model, name, specification;
b. Trademark;
c. Manufacturer's name,
d. Manufacturing date or number.
7.2 Packaging, transportation, storage
According to the provisions of ZBY17004.
Additional remarks:
This standard is proposed by the Quality Standards Department of China Light Industry Association. This standard is under the jurisdiction of the National Sewing Machine Standardization Center. This standard was drafted by Shanghai Xiechang Sewing Machine Factory, Nanjing 513 Factory, Shanghai Sewing Machine Factory No. 1, and Wuhan Garment Machinery Factory. The main drafters of this standard are Chen Jialian, He Zhaoxu, Li Meidi and Ma Rujie.Oil supply and oil inspection
-iiiKAoNiKAca-
001×Relevant number(%)Concentration practical
01（%)
0090018
0008000
00s1~00
uu/Special
09X008
09×009
Industry base
000881
(22/01
2s2/00)
z/xa6s
919909
（97）
QB/T2148—1995
Run at 90% of the maximum sewing speed for 1 minute, visually check the continuous oil supply in the oil window, and after running, remove the panel to check the oil return; b. Oil leakage inspection
After the sewing performance test, visually inspect the oil-proof sleeve of the needle bar swing frame, the lower section of the needle bar of the swing frame, the clamping rod sleeve, the rear sleeve of the upper shaft, the upper cover, the upper cover oil cover, the panel, the rear cover, the forward and reverse wrench shaft, the horizontal needle cover plate, and the stitch adjustment screw. There should be no oil leakage and no oil stain on the sewing material. 5.5 Inspection of accessories and spare parts specified in 4.6 of this standard Check the accessories and spare parts item by item according to the types and quantities specified in the product manual or packing list, and the quantity should not be less than the specified quantity. 6 Inspection rules
Inspection items, quality characteristic classification and inspection classification are shown in Table 3. Table 3
Inspection items
Appearance quality
Machine performance
Sewing performance
Operation performance
Accessories and spare parts
4.1.1 Quality of baking varnish
Inspection strip
4.1.2 Quality of machine head surface
4.1.3 Quality of exposed parts
4.1.4 Quality of electroplated parts
4.1.5 Quality of blackened parts
4.2.1 Maximum sewing speed
4.2.2 Maximum stitch length and width
4.2.3 Adjustment of each mechanism
4.2.4 Loose thread effect
4.2.5 Wrench starting force
4.2.6 Error in forward and reverse stitch length
4. 2. 7 Feeding direction stability
4.2.8 Offset plate
4.3.1 Relative error of stitch length and width
4.3.2 Creep
4.3.3 Continuous sewing
4.3. 4 Sewing of medium-thick materials
4.3.5 Layer seams
4.3.6 Seam thickness
No abnormal noise
Noise level dB(A)
4.4.2 Vibration displacement
No jamming
Starting torque Nm
4.4.4 Oil supply, oil return, oil leakage
4. 5 Accessories and spare parts
Classification of quality characteristics
Inspection classification
—1995
QB/T 2148
iiiKAoNiKAca-
6.1 The machine head must be inspected and qualified by the inspection department before it can leave the factory, and it must be accompanied by an inspection certificate and a continuous stitch sample with a size of 100mm X 30mm.
6.2 Inspection classification
Product inspection is divided into two categories: factory inspection and type inspection. 6.2.1 Factory inspection
When the product is delivered, it must be inspected. The inspection rules and items shall be in accordance with the factory inspection regulations. The consignee has the right to accept the product according to the factory inspection items specified in this standard. 6.2.2 Type inspection
If one of the following situations occurs, a comprehensive assessment of product quality is required and a type inspection should be carried out. a. Trial determination and identification of new products or old products transferred to the factory for production; b. After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c. During normal production, periodic inspection should be carried out once every 3 months; d. When the product is resumed after a long period of suspension; e. When the results of the final inspection are significantly different from the last type inspection; f. When the superior quality supervision agency proposes a request for type inspection. 6.2.3 Product quality characteristics and inspection classification
According to the severity of the non-conformity of product quality characteristics, it is divided into Class B unqualified and Class C unqualified. 6.3 Factory inspection rules
6.3.1 Sample selection
Samples should be randomly selected from the submitted inspection batches. 6.3.2 Inspection level, sampling plan, qualified quality level and sample size shall be as specified in Table 4. Table 4
Inspection level
Sampling plan
Non-conformity classification
Number of unit sample inspection items
Qualified quality level (AQL)
Batch range
26~150
151～1200
Sample size letter
Note: (①Unit sample is each machine head; Sample size
②A., R. Determination number regulations: Class B is counted by the number of non-conforming products, and Class C is counted by the number of non-conforming products. 6.3.3 Judgment of qualified or unqualified inspection batch B
Normal inspection once Sampling
According to the results of sample inspection, if the number of Class B non-conforming products and Class C non-conforming products found in the sample are less than or equal to the corresponding qualified judgment number (A.), then the inspection batch is judged to be a qualified batch. If the number of Class B non-conforming products and Class C non-conforming products found in the sample are greater than or equal to the corresponding non-conforming judgment number (R.), then the inspection batch is judged to be a non-conforming batch. 6.3.4 The disposal of non-conforming products and batches after inspection shall comply with the provisions of Article 4.12 of GB/T2828.
6.4 Type inspection
6.4.1 Sampling
QB/T 2148--1995
The samples shall be drawn from a batch or several batches manufactured in this cycle and qualified by factory inspection, and it shall be ensured that the obtained samples can represent the manufacturing technology level of this cycle.
6.4.2 The discrimination level, sampling plan, unqualified quality level and sample size shall be as specified in Table 5. Table 5
Inspection level
Sampling plan
Unqualified classification
Number of sample unit inspection items
Unqualified quality level (RQL)
Note: ①The unit sample is each machine head.
Sample size
②Ac, R. Provisions for the judgment number: Class B is counted by the number of unqualified products, and Class C is counted by the number of unqualified products. 6.4.3 Judgment of qualified or unqualified type inspection B
Normal inspection secondary sampling
According to the results of the sample inspection, if Class B is found in the first sample, If the number of defective products and the number of Class C defective products are both less than or equal to the corresponding first determination number (A), the batch is judged to be a qualified batch. If the number of Class B defective products and the number of Class C defective products in the sample are found to be greater than or equal to the corresponding first defective determination number (R.), the batch is judged to be a defective batch. If the number of defective products or defective numbers found in the first sample is one or more categories greater than the corresponding first qualified determination number (A), and at the same time less than the corresponding first defective determination number (R.), a second sample is drawn for inspection. If the sum of the number of Class B defective products and the sum of the number of Class C defective products found in the second sample are both less than or equal to the corresponding second qualified determination number (A.), the batch is judged to be a qualified batch. If the sum of the number of Class B defective products or the sum of the number of Class C defective products found in the first and second samples is greater than or equal to the corresponding second defective determination number (R), the batch is judged to be a defective batch. 6.4.4 Disposal after type inspection
According to Article 4.12 of GB/T2829.
7 Marking, packaging, transportation, storage
7.1 Marking
The machine head should have the following markings:
a. Product model, name, specification;
b. Trademark;
c. Manufacturer's name,
d. Manufacturing date or number.
7.2 Packaging, transportation, storage
According to the provisions of ZBY17004.
Additional remarks:
This standard is proposed by the Quality Standards Department of China Light Industry Association. This standard is under the jurisdiction of the National Sewing Machine Standardization Center. This standard was drafted by Shanghai Xiechang Sewing Machine Factory, Nanjing 513 Factory, Shanghai Sewing Machine Factory No. 1, and Wuhan Garment Machinery Factory. The main drafters of this standard are Chen Jialian, He Zhaoxu, Li Meidi and Ma Rujie.Oil supply and oil inspection
-iiiKAoNiKAca-
001×Relevant number(%)Concentration practical
01（%)
0090018
0008000
00s1~00
uu/Special
09X008
09×009
Industry base
000881
(22/01
2s2/00)
z/xa6s
919909
（97）
QB/T2148—1995
Run at 90% of the maximum sewing speed for 1 minute, visually check the continuous oil supply in the oil window, and after running, remove the panel to check the oil return; b. Oil leakage inspection
After the sewing performance test, visually inspect the oil-proof sleeve of the needle bar swing frame, the lower section of the needle bar of the swing frame, the clamping rod sleeve, the rear sleeve of the upper shaft, the upper cover, the upper cover oil cover, the panel, the rear cover, the forward and reverse wrench shaft, the horizontal needle cover plate, and the stitch adjustment screw. There should be no oil leakage and no oil stain on the sewing material. 5.5 Inspection of accessories and spare parts specified in 4.6 of this standard Check the accessories and spare parts item by item according to the types and quantities specified in the product manual or packing list, and the quantity should not be less than the specified quantity. 6 Inspection rules
Inspection items, quality characteristic classification and inspection classification are shown in Table 3. Table 3
Inspection items
Appearance quality
Machine performance
Sewing performance
Operation performance
Accessories and spare parts
4.1.1 Quality of baking varnish
Inspection strip
4.1.2 Quality of machine head surface
4.1.3 Quality of exposed parts
4.1.4 Quality of electroplated parts
4.1.5 Quality of blackened parts
4.2.1 Maximum sewing speed
4.2.2 Maximum stitch length and width
4.2.3 Adjustment of each mechanism
4.2.4 Loose thread effect
4.2.5 Wrench starting force
4.2.6 Error in forward and reverse stitch length
4. 2. 7 Feeding direction stability
4.2.8 Offset plate
4.3.1 Relative error of stitch length and width
4.3.2 Creep
4.3.3 Continuous sewing
4.3. 4 Sewing of medium-thick materials
4.3.5 Layer seams
4.3.6 Seam thickness
No abnormal noise
Noise level dB(A)
4.4.2 Vibration displacement
No jamming
Starting torque Nm
4.4.4 Oil supply, oil return, oil leakage
4. 5 Accessories and spare parts
Classification of quality characteristics
Inspection classification
—1995
QB/T 2148
iiiKAoNiKAca-
6.1 The machine head must be inspected and qualified by the inspection department before it can leave the factory, and it must be accompanied by an inspection certificate and a continuous stitch sample with a size of 100mm X 30mm.
6.2 Inspection classification
Product inspection is divided into two categories: factory inspection and type inspection. 6.2.1 Factory inspection
When the product is delivered, it must be inspected. The inspection rules and items shall be in accordance with the factory inspection regulations. The consignee has the right to accept the product according to the factory inspection items specified in this standard. 6.2.2 Type inspection
If one of the following situations occurs, a comprehensive assessment of product quality is required and a type inspection should be carried out. a. Trial determination and identification of new products or old products transferred to the factory for production; b. After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c. During normal production, periodic inspection should be carried out once every 3 months; d. When the product is resumed after a long period of suspension; e. When the results of the final inspection are significantly different from the last type inspection; f. When the superior quality supervision agency proposes a request for type inspection. 6.2.3 Product quality characteristics and inspection classification
According to the severity of the non-conformity of product quality characteristics, it is divided into Class B unqualified and Class C unqualified. 6.3 Factory inspection rules
6.3.1 Sample selection
Samples should be randomly selected from the submitted inspection batches. 6.3.2 Inspection level, sampling plan, qualified quality level and sample size shall be as specified in Table 4. Table 4
Inspection level
Sampling plan
Non-conformity classification
Number of unit sample inspection items
Qualified quality level (AQL)
Batch range
26~150
151～1200
Sample size letter
Note: (①Unit sample is each machine head; Sample size
②A., R. Determination number regulations: Class B is counted by the number of non-conforming products, and Class C is counted by the number of non-conforming products. 6.3.3 Judgment of qualified or unqualified inspection batch B
Normal inspection once Sampling
According to the results of sample inspection, if the number of Class B non-conforming products and Class C non-conforming products found in the sample are less than or equal to the corresponding qualified judgment number (A.), then the inspection batch is judged to be a qualified batch. If the number of Class B non-conforming products and Class C non-conforming products found in the sample are greater than or equal to the corresponding non-conforming judgment number (R.), then the inspection batch is judged to be a non-conforming batch. 6.3.4 The disposal of non-conforming products and batches after inspection shall comply with the provisions of Article 4.12 of GB/T2828.
6.4 Type inspection
6.4.1 Sampling
QB/T 2148--1995
The samples shall be drawn from a batch or several batches manufactured in this cycle and qualified by factory inspection, and it shall be ensured that the obtained samples can represent the manufacturing technology level of this cycle.
6.4.2 The discrimination level, sampling plan, unqualified quality level and sample size shall be as specified in Table 5. Table 5
Inspection level
Sampling plan
Unqualified classification
Number of sample unit inspection items
Unqualified quality level (RQL)
Note: ①The unit sample is each machine head.
Sample size
②Ac, R. Provisions for the judgment number: Class B is counted by the number of unqualified products, and Class C is counted by the number of unqualified products. 6.4.3 Judgment of qualified or unqualified type inspection B
Normal inspection secondary sampling
According to the results of the sample inspection, if Class B is found in the first sample, If the number of defective products and the number of Class C defective products are both less than or equal to the corresponding first determination number (A), the batch is judged to be a qualified batch. If the number of Class B defective products and the number of Class C defective products in the sample are found to be greater than or equal to the corresponding first defective determination number (R.), the batch is judged to be a defective batch. If the number of defective products or defective numbers found in the first sample is one or more categories greater than the corresponding first qualified determination number (A), and at the same time less than the corresponding first defective determination number (R.), a second sample is drawn for inspection. If the sum of the number of Class B defective products and the sum of the number of Class C defective products found in the second sample are both less than or equal to the corresponding second qualified determination number (A.), the batch is judged to be a qualified batch. If the sum of the number of Class B defective products or the sum of the number of Class C defective products found in the first and second samples is greater than or equal to the corresponding second defective determination number (R), the batch is judged to be a defective batch. 6.4.4 Disposal after type inspection
According to Article 4.12 of GB/T2829.
7 Marking, packaging, transportation, storage
7.1 Marking
The machine head should have the following markings:
a. Product model, name, specification;
b. Trademark;
c. Manufacturer's name,
d. Manufacturing date or number.
7.2 Packaging, transportation, storage
According to the provisions of ZBY17004.
Additional remarks:
This standard is proposed by the Quality Standards Department of China Light Industry Association. This standard is under the jurisdiction of the National Sewing Machine Standardization Center. This standard was drafted by Shanghai Xiechang Sewing Machine Factory, Nanjing 513 Factory, Shanghai Sewing Machine Factory No. 1, and Wuhan Garment Machinery Factory. The main drafters of this standard are Chen Jialian, He Zhaoxu, Li Meidi and Ma Rujie.2 Packaging, transportation and storage
According to the provisions of ZBY17004.
Additional remarks:
This standard is proposed by the Quality Standards Department of China Light Industry Association. This standard is under the jurisdiction of the National Sewing Machine Standardization Center. This standard was drafted by Shanghai Xiechang Sewing Machine Factory, Nanjing 513 Factory, Shanghai Sewing Machine Factory No. 1, and Wuhan Garment Machinery Factory. The main drafters of this standard are Chen Jialian, He Zhaoxu, Li Meidi, and Ma Rujie. 3812 Packaging, transportation and storage
According to the provisions of ZBY17004.
Additional remarks:
This standard is proposed by the Quality Standards Department of China Light Industry Association. This standard is under the jurisdiction of the National Sewing Machine Standardization Center. This standard was drafted by Shanghai Xiechang Sewing Machine Factory, Nanjing 513 Factory, Shanghai Sewing Machine Factory No. 1, and Wuhan Garment Machinery Factory. The main drafters of this standard are Chen Jialian, He Zhaoxu, Li Meidi, and Ma Rujie. 381Oil leakage inspection
After the sewing performance test, visually inspect the oil-proof sleeve of the needle bar swing frame, the lower section of the needle bar of the swing frame, the clamping rod sleeve, the rear sleeve of the upper shaft, the upper cover, the upper cover oil cover, the panel, the rear cover, the forward and reverse wrench shaft, the horizontal needle cover plate, and the stitch adjustment screw. There should be no oil leakage and no oil stain on the sewing material. 5.5 Inspection of accessories and spare parts specified in 4.6 of this standard Check the accessories and spare parts item by item according to the types and quantities specified in the product manual or packing list, and the quantity should not be less than the specified quantity. 6 Inspection rules
See Table 3 for inspection items, quality characteristic classification and inspection classification. Table 3
Inspection items
Appearance quality
Machine performance
Sewing performance
Operation performance
Accessories and spare parts
4.1.1 Quality of baking varnish
Inspection strip
4.1.2 Quality of machine head surface
4.1.3 Quality of exposed parts
4.1.4 Quality of electroplated parts
4.1.5 Quality of blackened parts
4.2.1 Maximum sewing speed
4.2.2 Maximum stitch length and width
4.2.3 Adjustment of each mechanism
4.2.4 Loose thread effect
4.2.5 Wrench starting force
4.2.6 Error in forward and reverse stitch length
4. 2. 7 Feeding direction stability
4.2.8 Offset plate
4.3.1 Relative error of stitch length and width
4.3.2 Creep
4.3.3 Continuous sewing
4.3. 4 Sewing of medium-thick materials
4.3.5 Layer seams
4.3.6 Seam thickness
No abnormal noise
Noise level dB(A)
4.4.2 Vibration displacement
No jamming
Starting torque Nm
4.4.4 Oil supply, oil return, oil leakage
4. 5 Accessories and spare parts
Classification of quality characteristics
Inspection classification
—1995
QB/T 2148
iiiKAoNiKAca-
6.1 The machine head must be inspected and qualified by the inspection department before it can leave the factory, and it must be accompanied by an inspection certificate and a continuous stitch sample with a size of 100mm X 30mm.
6.2 Inspection classification
Product inspection is divided into two categories: factory inspection and type inspection. 6.2.1 Factory inspection
When the product is delivered, it must be inspected. The inspection rules and items shall be in accordance with the factory inspection regulations. The consignee has the right to accept the product according to the factory inspection items specified in this standard. 6.2.2 Type inspection
If one of the following situations occurs, a comprehensive assessment of product quality is required and a type inspection should be carried out. a. Trial determination and identification of new products or old products transferred to the factory for production; b. After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c. During normal production, periodic inspection should be carried out once every 3 months; d. When the product is resumed after a long period of suspension; e. When the results of the final inspection are significantly different from the last type inspection; f. When the superior quality supervision agency proposes a request for type inspection. 6.2.3 Product quality characteristics and inspection classification
According to the severity of the non-conformity of product quality characteristics, it is divided into Class B unqualified and Class C unqualified. 6.3 Factory inspection rules
6.3.1 Sample selection
Samples should be randomly selected from the submitted inspection batches. 6.3.2 Inspection level, sampling plan, qualified quality level and sample size shall be as specified in Table 4. Table 4
Inspection level
Sampling plan
Non-conformity classification
Number of unit sample inspection items
Qualified quality level (AQL)
Batch range
26~150
151～1200
Sample size letter
Note: (①Unit sample is each machine head; Sample size
②A., R. Determination number regulations: Class B is counted by the number of non-conforming products, and Class C is counted by the number of non-conforming products. 6.3.3 Judgment of qualified or unqualified inspection batch B
Normal inspection once Sampling
According to the results of sample inspection, if the number of Class B non-conforming products and Class C non-conforming products found in the sample are less than or equal to the corresponding qualified judgment number (A.), then the inspection batch is judged to be a qualified batch. If the number of Class B non-conforming products and Class C non-conforming products found in the sample are greater than or equal to the corresponding non-conforming judgment number (R.), then the inspection batch is judged to be a non-conforming batch. 6.3.4 The disposal of non-conforming products and batches after inspection shall comply with the provisions of Article 4.12 of GB/T2828.
6.4 Type inspection
6.4.1 Sampling
QB/T 2148--1995
The samples shall be drawn from a batch or several batches manufactured in this cycle and qualified by factory inspection, and it shall be ensured that the obtained samples can represent the manufacturing technology level of this cycle.
6.4.2 The discrimination level, sampling plan, unqualified quality level and sample size shall be as specified in Table 5. Table 5
Inspection level
Sampling plan
Unqualified classification
Number of sample unit inspection items
Unqualified quality level (RQL)
Note: ①The unit sample is each machine head.
Sample size
②Ac, R. Provisions for the judgment number: Class B is counted by the number of unqualified products, and Class C is counted by the number of unqualified products. 6.4.3 Judgment of qualified or unqualified type inspection B
Normal inspection secondary sampling
According to the results of the sample inspection, if Class B is found in the first sample, If the number of defective products and the number of Class C defective products are both less than or equal to the corresponding first determination number (A), the batch is judged to be a qualified batch. If the number of Class B defective products and the number of Class C defective products in the sample are found to be greater than or equal to the corresponding first defective determination number (R.), the batch is judged to be a defective batch. If the number of defective products or defective numbers found in the first sample is one or more categories greater than the corresponding first qualified determination number (A), and at the same time less than the corresponding first defective determination number (R.), a second sample is drawn for inspection. If the sum of the number of Class B defective products and the sum of the number of Class C defective products found in the second sample are both less than or equal to the corresponding second qualified determination number (A.), the batch is judged to be a qualified batch. If the sum of the number of Class B defective products or the sum of the number of Class C defective products found in the first and second samples is greater than or equal to the corresponding second defective determination number (R), the batch is judged to be a defective batch. 6.4.4 Disposal after type inspection
According to Article 4.12 of GB/T2829.
7 Marking, packaging, transportation, storage
7.1 Marking
The machine head should have the following markings:
a. Product model, name, specification;
b. Trademark;
c. Manufacturer's name,
d. Manufacturing date or number.
7.2 Packaging, transportat
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.