Some standard content:
Light Industry Standard of the People's Republic of China
Industrial Sewing Machine
1 Subject Content and Scope of Application
Fur Splicing Seam Sewing Machine Head
QB/T 1516 992
This standard specifies the product classification, technical requirements, test methods, inspection planning, marking, packaging, transportation and storage of industrial fur plowing seam sewing machine heads.
This standard applies to the splicing seam sewing machine heads (hereinafter referred to as "heads") for splicing various furs, leathers and synthetic leathers. 2
Cited standards
GB/T 4515
Classification and terminology of stitches
ZBY 17002
Technical conditions for blackening of sewing machine parts
Sewing machine packaging
ZBY 17004
ZBY17023 Test method for starting torque of sewing machine head 3 Product classification
3.1 Products are divided into the following four types:
Type 1: patchwork of thin materials and furs
Type: patchwork of medium and thick materials and furs
Prototype: patchwork of thick materials and furs
Type W: patchwork of thick leather, synthetic leather and thick materials and furs 3.2 Type
This machine head is a box-type body, which adopts straight needle punching material, swing hook hook thread, toothed disc feeding, and forms 501 type stitches. 3.3 Basic parameters (see Table 1) Basic numerical items Maximum sewing speed, needle/min Thickness (under free state) mm Stitch length adjustment, mm Needle used Thread used Machine power, W 4. GPX1 type \|tt||Nm 45-120 (18tex-5.9tex)/3-strand cotton thread Polyester thread 250 370 Note: 1) Equivalent to German 1567, 459R and American Singer Sy6520 needles. Approved by the Ministry of Light Industry of the People's Republic of China on June 8, 1992 224
4 (Meeting to revise)
Implemented on February 1, 1993
4 Technical requirements
4.1 Appearance quality
QB/T1516—1992
4.1.1 The surface of the baking varnish should be flat and uniform in color, and the main visible parts should not have obvious defects such as paint flow, blistering and paint contact. 4.1.2 There should be no rust on the surface of the head, and the label should be complete, correctly positioned, and without obvious scars. 4.1.3 The surface of the electroplated part should be flat and smooth, with uniform color, and should not have defects such as missing plating, peeling, spots, scratches and rust. 4.1.4 The surface quality of blackened parts should comply with the provisions of Article 1.1 of ZBY17002. 4.1.5 Exposed parts should be free of burrs.
4.2 Sewing performance
When the sewing performance is tested under the conditions specified in Table 2, the following requirements must be met: When sewing general and thick, there should be no broken needles, broken threads, skipped stitches, or floating threads. a.
When the cumulative length of continuous sewing is 1m, no broken threads are allowed. b.
4.3 Operation performance
4.3.1 Operation noise
When operating at the highest sewing speed without load, there should be no abnormal noise; when operating continuously at 90% of the highest sewing speed, the noise sound pressure level should not exceed 83dB(A). b.
4.3.2 The machine head should operate smoothly, and when it is without load, its starting torque value should not exceed 0.6N·m. 4.3.3 The sealing surface should have a sealing device, and there should be no obvious oil leakage. 4.3.4 The oil supply of the oil pump lubrication system should be good. When the machine head is running, the oil pump outlet must start to supply oil within 25 seconds. 4.4 Machine performance
4.4.1 The adjustment range of the stitch length should comply with the provisions of Table 1, and there should be no self-slip after adjustment. 4.4.2 The relative error value of the stitch length should not be greater than 20%. 4.4.3 The thread tension should be adjustable, and the thread loosening nail should play a role in loosening the thread. 4.4.4 The pressure of the pressing plate should be adjustable.
4.5 Accessories and spare parts
Each machine should have necessary accessories and spare parts. The types and quantities of accessories and spare parts shall be as specified in the instruction manual. 5 Test methods
5.1 Appearance quality
5.1.1 The appearance quality specified in 4.1.1, 4.1.2, 4.1.3 and 4.1.5 of this standard shall be visually inspected under natural light with an illumination of 600±2001x and a distance of 300mm.
5.1.2 The quality of blackened parts specified in 4.1.4 of this standard shall be tested in accordance with the method specified in 2.1.1 of ZBY17002. 5.2 Sewing performance
General seam, seam thickness and continuous sewing performance tests shall be carried out according to the conditions specified in Table 2 according to different product types. The allowable deviation of sewing speed is -3%; 5.9tex/3-strand cotton thread 7.5tex/3-strand cotton thread 65/3-strand nylon thread 65/3-strand nylon thread tt|| Material thickness, mm 0.7~1 (fur) 1.2~1.5 (fur) 2.5~3 (fur) ||0.8 (artificial leather)
Test stitching
Needle/min
QB/T1516--1992
Continued Table 2
15.9tex/3-strand cotton thread
И-type Nm90
7.5tex/3-strand cotton thread
65/3-strand nylon thread
Nm120|65/3-strand nylon thread||tt| |5.9tex/3-strand cotton thread
7.5tex/3-strand cotton thread
Nm9065/3-strand nylon thread
65/3-strand nylon thread
Thickness of sewing material, mm
0.9~1.3(fur)
1.8~~2.2(fur)
3.2~3.8(fur)
0.8(artificial leather)
【0.7～1（fur）
1.2～1.5(fur）
2.5～3(fur)
0.8（artificial leather）
Splicing test
Stitch sewing speed
Length needle/min
Maximum 3000
Before sewing performance test, it is allowed to adjust the stitch length, thread tension and pressure of pressing sewing materials, but other parts shall not be adjusted. 5.3 Running performance
The maximum sewing speed shall be measured by photoelectric speed meter or other non-contact speed meter, and abnormal noise shall be measured by ear. 5.3.1
5.3.2 Noise level test
5.3.2.1 Test conditions
It should be carried out in a laboratory or semi-anechoic room with walls that do not generate reflected noise except the ground. The background noise of the test environment must be at least 10dB(A) lower than the noise of the machine head. The microphone is placed on the operator's side, and the axis of the microphone is aligned with the tangent point of the machine head feeding plate and the pressing plate, forming an angle of 45° with the pressing plane, and the distance is 450mm (see Figure 1). Microphone
Sound transmission plate
Feeding plate
5.3.2.2 Measuring instrument
A sound level meter with an accuracy of ±0.7dB is used; Figure 1
Jade plate
The measuring instrument includes the entire test system including the microphone and cable, and should be calibrated according to relevant regulations before each test. b.
5.3.2.3 Test procedure
Release the pressure plate and adjust the stitch length to the maximum; during measurement, the machine is placed on a 20mm thick sponge base plate with a bottom and surrounding pads; the machine head under test runs continuously at 90% of the maximum speed, and at the end of 1 minute, record its indication; perform the test 5 times in a row according to the above method and take the arithmetic mean. Start-up torque test
Perform according to the provisions of ZBY17023.
5.3.4 Sealing performance test
QB/T 1516-1992
Run at the highest sewing speed, run for 25s, stop for 10s, and continue for 30min. Stop the machine to check whether there is obvious oil leakage on each sealing surface. 5.3.5 Oil pump oil supply inspection
Principle: The sewing speed of the machine head is 2000 stitches/min; b, the machine head runs for 1mn, stops for 155, and when it continues to run, the oil pump outlet must start to supply oil within 25s. 5.4 Machine performance test
5.4.1 Test of 4.1.1 of this standard:
5.4.1.1 Maximum and minimum stitch length test Adjust the stitch length to the maximum and minimum, and the other inspection conditions are the same as the requirements for ordinary sewing items in Table 2:. Sewing 300mm on two layers of fur or synthetic leather: Use a vernier caliper to measure the total length of 10 consecutive small and large stitches on the seam, and calculate the average value of the smallest stitch and the average value of the largest stitch.
5.4.1.2 After adjustment, there should be no self-moving items, which should be checked in the sewing performance. 5.4.2 The error of the stitch length sample should be checked in ordinary sewing. After sewing, the length of 10 stitches in the front section of the sewing material and the length of 10 stitches in the middle section of the sewing material are measured. The relative error value is calculated according to the following formula: f(%)=two wires×100
where; f-
relative error of stitch length.
5.4.3 Test of the function of loosening thread nail:
Turn the hand wheel, and when the needle bar moves, the daily loosening thread ball and the pressing thread screw work normally and have the function of loosening thread. 5.4.4 The pressure of the pressing plate should be adjustable, which should be carried out in the sewing performance test. 5.5 Accessories and spare parts
Check according to the instructions or the packing list.
6 Inspection rules
6.1 Products leaving the factory must be inspected and qualified by the enterprise's quality inspection department, and be accompanied by an inspection certificate. 6.2 Inspection classification
6.2.1 Factory inspection
The consignee has the right to inspect and accept the factory inspection items according to the provisions of this standard. 6.2.2 Type inspection
In the following cases, it is necessary to conduct a comprehensive assessment of product quality and conduct type inspection for new products or old products transferred to the factory for trial production and adjustment: static
After formal production, if there are major changes in structure, materials, and processes that may affect product performance, a periodic inspection should be conducted after six months of normal production (one month, quarter, half a year or one year depending on the product); d. When the product is resumed after a long period of suspension; when there is a large difference between the factory inspection results and the last type inspection; 1. When the superior quality supervision agency proposes a requirement for type inspection. 6.2.3 Unqualified categories and inspection categories
Inspection items, unqualified categories and inspection categories are shown in Table 3. The sample unit is each sewing machine head, and Class B is counted as unqualified products and Class C is counted as the number of unqualified products.
6.3 Factory inspection rules
6.3.1 Sample selection
Inspection items
QB/T 1516—1992
Unqualified categories
Ordinary sewing
Samples should be randomly selected from the inspection batch submitted. 6.3.2 Sampling plan and strictness
Inspection classification
Normal inspection The primary sampling plan is shown in Table 4, the determination of strictness and its transfer rules, and the primary sampling plan after transfer shall comply with the provisions of GB/T2828.
Inspection level
Sampling plan
Non-conformance classification
Number of unit sample inspection items
Qualified quality level (AQL)
Batch range
26~150
151～1200
Sample size code
Sample size
Normal inspection single sampling
6.3.3 Judgment of qualified and unqualified inspection batches QB/T1516—1992
According to the results of sample inspection, if the number of Class B non-conformance products and Class C non-conformance products found in the sample are both 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-conformance products and Class C non-conformance products found in the sample is either greater than or equal to the corresponding unqualified judgment number (R.), then the inspection batch is judged to be an unqualified batch. 6.3.4 Disposal of unqualified products and batches after inspection The ordering party has the right to reject unqualified products found during inspection in qualified batches. In principle, all batches judged as unqualified shall be returned to the supplier or resolved by negotiation between the supplier and the ordering party. The supplier shall allow the unqualified products to be submitted for inspection again after removing or repairing them on the basis of 100% inspection of the unqualified batches.
For the batches submitted for inspection again, whether to use normal inspection or strict inspection, whether to check all items or only the items that cause the batch to fail, shall be decided by the ordering party.
6.4 Rules for type inspection
6.4.1 Sampling
The samples shall be drawn from a batch or batches manufactured in this cycle and qualified by the export inspection, and it shall be ensured that the obtained samples can represent the manufacturing technology level of this period (when using the secondary sampling plan, each sample shall be taken at the same time). 6.4.2 Sampling plan
The secondary sampling plan for type inspection is shown in Table 5. Table 5
Judgment level
Sampling plan
Non-conformity classification
Number of sample inspection items
Non-conformity quality level (RQL)
Sample size
6.4.3 Judgment of pass or fail in type inspection A
According to the results of sample inspection, if the number of non-conforming products of Class B and the number of non-conforming products of Class C found in the first sample are both less than or equal to the corresponding first qualified judgment number (A.), then the inspection lot is judged to be a qualified lot. If one of the number of non-conforming products of Class B and the number of non-conforming products of Class C found in the sample is greater than or equal to the corresponding first unconformity judgment number (R), then the inspection lot is judged to be an unconformity. If the number of defective products or the number of unqualified products found in the first sample is greater than the corresponding qualified judgment number (A.) in one category or in two categories, and both are less than the corresponding unqualified judgment number (R.), then the second sample shall be drawn for inspection. If the total number of defective products of Class B and the total number of unqualified products of Class C found in the first and second samples are less than or equal to the corresponding second qualified judgment number (A.), then the inspection batch is judged to be a qualified batch. If the total number of defective products of Class E or the total number of unqualified products of Class C found in the first and second samples is greater than or equal to the corresponding second unqualified judgment number (R), then the inspection batch is judged to be unqualified. 6.4.4 Treatment after type inspection
The treatment after type inspection shall be in accordance with Article 4.12 of GB/T2829. 7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 Product marking
The following markings shall be marked on the machine head:
Manufacturer's name:
Trademark,
Product model or mark;
QB/T1516.- 1992
Manufacturing date (or number) or production batch number.
Outer packaging marking
According to the provisions of ZBY17004.
Packaging, transportation and storage
According to the provisions of ZBY17004.
Additional remarks:
This standard was proposed by the Quality Standards Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Sewing Machine Standardization Center. This standard was drafted by Shanghai Sewing Machine Factory. The main drafter of this standard is Li Meidi.2 Sampling plan and strictness
Inspection classification
The normal inspection single sampling plan is shown in Table 4, the determination of strictness and its transfer rules, and the single sampling plan after transfer shall comply with the provisions of GB/T2828.
Inspection level
Sampling plan
Non-conformance classification
Number of unit sample inspection items
Qualified quality level (AQL)
Batch range
26~150
151～1200
Sample size code
Sample size
Normal inspection single sampling
6.3.3 Judgment of qualified and unqualified inspection batches QB/T1516—1992
According to the results of sample inspection, if the number of Class B non-conformance products and Class C non-conformance products found in the sample are both 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-conformance products and Class C non-conformance products found in the sample is either greater than or equal to the corresponding unqualified judgment number (R.), then the inspection batch is judged to be an unqualified batch. 6.3.4 Disposal of unqualified products and batches after inspection The ordering party has the right to reject unqualified products found during inspection in qualified batches. In principle, all batches judged as unqualified shall be returned to the supplier or resolved by negotiation between the supplier and the ordering party. The supplier shall allow the unqualified products to be submitted for inspection again after removing or repairing them on the basis of 100% inspection of the unqualified batches.
For the batches submitted for inspection again, whether to use normal inspection or strict inspection, whether to check all items or only the items that cause the batch to fail, shall be decided by the ordering party.
6.4 Rules for type inspection
6.4.1 Sampling
The samples shall be drawn from a batch or batches manufactured in this cycle and qualified by the export inspection, and it shall be ensured that the obtained samples can represent the manufacturing technology level of this period (when using the secondary sampling plan, each sample shall be taken at the same time). 6.4.2 Sampling plan
The secondary sampling plan for type inspection is shown in Table 5. Table 5
Judgment level
Sampling plan
Non-conformity classification
Number of sample inspection items
Non-conformity quality level (RQL)
Sample size
6.4.3 Judgment of pass or fail in type inspection A
According to the results of sample inspection, if the number of non-conforming products of Class B and the number of non-conforming products of Class C found in the first sample are both less than or equal to the corresponding first qualified judgment number (A.), then the inspection lot is judged to be a qualified lot. If one of the number of non-conforming products of Class B and the number of non-conforming products of Class C found in the sample is greater than or equal to the corresponding first unconformity judgment number (R), then the inspection lot is judged to be an unconformity. If the number of defective products or the number of unqualified products found in the first sample is greater than the corresponding qualified judgment number (A.) in one category or in two categories, and both are less than the corresponding unqualified judgment number (R.), then the second sample shall be drawn for inspection. If the total number of defective products of Class B and the total number of unqualified products of Class C found in the first and second samples are less than or equal to the corresponding second qualified judgment number (A.), then the inspection batch is judged to be a qualified batch. If the total number of defective products of Class E or the total number of unqualified products of Class C found in the first and second samples is greater than or equal to the corresponding second unqualified judgment number (R), then the inspection batch is judged to be unqualified. 6.4.4 Treatment after type inspection
The treatment after type inspection shall be in accordance with Article 4.12 of GB/T2829. 7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 Product marking
The following markings shall be marked on the machine head:
Manufacturer's name:
Trademark,
Product model or mark;
QB/T1516.- 1992
Manufacturing date (or number) or production batch number.
Outer packaging marking
According to the provisions of ZBY17004.
Packaging, transportation and storage
According to the provisions of ZBY17004.
Additional remarks:
This standard is proposed by the Quality Standards Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Sewing Machine Standardization Center. This standard was drafted by Shanghai Sewing Machine Factory. The main drafter of this standard is Li Meidi.2 Sampling plan and strictness
Inspection classification
The normal inspection single sampling plan is shown in Table 4, the determination of strictness and its transfer rules, and the single sampling plan after transfer shall comply with the provisions of GB/T2828.
Inspection level
Sampling plan
Non-conformance classification
Number of unit sample inspection items
Qualified quality level (AQL)
Batch range
26~150
151～1200
Sample size code
Sample size
Normal inspection single sampling
6.3.3 Judgment of qualified and unqualified inspection batches QB/T1516—1992
According to the results of sample inspection, if the number of Class B non-conformance products and Class C non-conformance products found in the sample are both 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-conformance products and Class C non-conformance products found in the sample is either greater than or equal to the corresponding unqualified judgment number (R.), then the inspection batch is judged to be an unqualified batch. 6.3.4 Disposal of unqualified products and batches after inspection The ordering party has the right to reject unqualified products found during inspection in qualified batches. In principle, all batches judged as unqualified shall be returned to the supplier or resolved by negotiation between the supplier and the ordering party. The supplier shall allow the unqualified products to be submitted for inspection again after removing or repairing them on the basis of 100% inspection of the unqualified batches.
For the batches submitted for inspection again, whether to use normal inspection or strict inspection, whether to check all items or only the items that cause the batch to fail, shall be decided by the ordering party. bzxZ.net
6.4 Rules for type inspection
6.4.1 Sampling
The samples shall be drawn from a batch or batches manufactured in this cycle and qualified by the export inspection, and it shall be ensured that the obtained samples can represent the manufacturing technology level of this period (when using the secondary sampling plan, each sample shall be taken at the same time). 6.4.2 Sampling plan
The secondary sampling plan for type inspection is shown in Table 5. Table 5
Judgment level
Sampling plan
Non-conformity classification
Number of sample inspection items
Non-conformity quality level (RQL)
Sample size
6.4.3 Judgment of pass or fail in type inspection A
According to the results of sample inspection, if the number of non-conforming products of Class B and the number of non-conforming products of Class C found in the first sample are both less than or equal to the corresponding first qualified judgment number (A.), then the inspection lot is judged to be a qualified lot. If one of the number of non-conforming products of Class B and the number of non-conforming products of Class C found in the sample is greater than or equal to the corresponding first unconformity judgment number (R), then the inspection lot is judged to be an unconformity. If the number of defective products or the number of unqualified products found in the first sample is greater than the corresponding qualified judgment number (A.) in one category or in two categories, and both are less than the corresponding unqualified judgment number (R.), then the second sample shall be drawn for inspection. If the total number of defective products of Class B and the total number of unqualified products of Class C found in the first and second samples are less than or equal to the corresponding second qualified judgment number (A.), then the inspection batch is judged to be a qualified batch. If the total number of defective products of Class E or the total number of unqualified products of Class C found in the first and second samples is greater than or equal to the corresponding second unqualified judgment number (R), then the inspection batch is judged to be unqualified. 6.4.4 Treatment after type inspection
The treatment after type inspection shall be in accordance with Article 4.12 of GB/T2829. 7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 Product marking
The following markings shall be marked on the machine head:
Manufacturer's name:
Trademark,
Product model or mark;
QB/T1516.- 1992
Manufacturing date (or number) or production batch number.
Outer packaging marking
According to the provisions of ZBY17004.
Packaging, transportation and storage
According to the provisions of ZBY17004.
Additional remarks:
This standard was proposed by the Quality Standards Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Sewing Machine Standardization Center. This standard was drafted by Shanghai Sewing Machine Factory. The main drafter of this standard is Li Meidi.
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