This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of shuttle bodies for household sewing machines. This standard applies to shuttle bodies for JA and JB type household sewing machines. QB/T 2145-1995 Shuttle bodies for household sewing machines QB/T2145-1995 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
Household Sewing Machines
1 Subject Content and Applicable Scope
Shuttle Body
QB/T2145—1995
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of shuttle bodies for household sewing machines.
This standard is applicable to shuttle bodies of JA and JB household sewing machines. 2 Reference standards
Packaging, storage and transportation pictorial marking
GB/T 2828
GB/T 2829
QB/T 1572
ZBY 17004
ZBY17022
3 Product classification
Batch inspection counting sampling sequence and sampling table (applicable to the inspection of continuous batches) Periodic inspection counting sampling procedure and sampling table (applicable to the inspection of production stability) General technical conditions for electroplating of sewing machine parts
Sewing machine packaging
Technical conditions for baking varnish for sewing machines
The shuttle bed body is divided into two types: front opening and rear opening. 3.2 Structural dimensions
The structural dimensions are shown in Figures 1 and 2.
Approved by China Light Industry General Association on October 24, 1995
Implemented on June 1, 1996
$42. 6 ±o.119
#64. 55+ 0. 03
QB/T 2145-1995
Figure 1 Rear-open shuttle bed body
1 Shuttle bed body, 2 Shuttle bed pin
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4 Technical requirements
QB/T2145-1995
+64. 55+0.03
Figure 2 Front-open shuttle bed body
0. 6 _0.03
4.1 The circular runout of the 64.55mm axis of the shuttle bed body to the inner wall of the 42.6mm hole is not greater than 0.06mm. 4.2 The height of the inner diameter of $42.6mm is 4.6+°C.018mm. 4.3 The inner diameter of the shuttle hook is $42.60:0mm. 4.4 The distance between the shuttle bed ring plane and the shuttle bed foot plane is 0.6-°C.o3mm. 4.5 The inner diameter of the shuttle bed foot is 64.55+g.3mm. 4. 6 The inner diameter of the shuttle bed of the front-opening shuttle bed body is 51±:mm. 4.7
The distance between the two mounting holes of the shuttle bed body is $62.5±0.15mm. 4.8 The distance between the two shuttle bed pin holes is $46.8±0.125mm. 4.9 The surface roughness of the inner wall of the $42.6mm hole and the shuttle hook matching plane is R.3.2μm. 4.10
The surface roughness of the shuttle bed ring matching plane is R.3.2μm. The surface roughness of the bottom plane A is R.3.2μm. The thread passing parts such as the shuttle handle groove should be smooth and free of defects such as notches and sharp edges. 4.13
$42.6mm The inner circle and the plane are not allowed to have defects such as sand holes. 4.14
The unprocessed surface should be electroplated or painted. There is no rust or peeling on the electroplated surface, and no paint peeling on the painted surface. 2-+5.5
5 Inspection method
QB/T2145—1995
5.1 The circular runout of the shuttle bed body axis to the inner wall of the hole is measured by the special measuring tool shown in Figure 3 in the following way. Install the shuttle bed body to be measured on the special mouse tool so that the shuttle bed body plane is in close contact with the measuring tool plane. Make the dial indicator on the special measuring tool contact the inner wall of the shuttle bed body hole and calibrate it to zero. The test position is from the center line of one calibration bed cover screw hole to the center line of the other shuttle bed cover screw hole. .
Rotate the special measuring tool turntable in the same direction, and the percentage value difference is the measured value. Figure 3
5.24.6mm height is measured by the special measuring tool shown in Figure 4 in the following method. , Use the standard block to calibrate the special measuring tool to zero. -riikAoNiKAca
b. Take the shuttle bed mating plane as the reference, from the center line of one ridge bed cover screw hole to the center line of the other shuttle bed cover screw hole as the effective measurement distance, rotate in the same direction, and measure all points on the bottom plane. The percentage value difference is the measured value. Figure 4
5.3 The inner diameter of the shuttle shuttle mating is measured with a special plug gauge QB/T2145-1995
5.4 The distance between the shuttle bed ring plane and the shuttle bed foot plane is measured by the special measuring tool shown in Figure 5 in the following method. ?
a. Use the standard block to calibrate the dial indicator on the special measuring tool to zero. b. Take the shuttle bed ring plane as the reference, measure any point on the shuttle bed foot plane before and after the two holes of Φ5.5, and the percentage difference is the measured value.
5.5 The inner diameter of the shuttle bed foot is measured with a special plug gauge. 5.6 The inner diameter of the shuttle bed diagram of the front-opening shuttle bed body is measured with a special plug gauge. 5.7 The distance between the two mounting holes is measured with a special measuring tool. 5.8 The distance between the two shuttle bed pin holes is measured with a special measuring tool. 5.9 The surface roughness of the inner wall of the Φ42.6 hole and the bottom plane of the shuttle rack is tested at a distance of 300mm under the illumination of 600±2001x, and is determined by visual inspection and comparison with the corresponding surface roughness plate. 5.10 The surface roughness of the shuttle bed ring matching plane is tested at a distance of .300mm under the illumination of 600±2001x, and is determined by self-test and comparison with the corresponding surface roughness plate.
5.11 The surface roughness of the bottom plane A is determined by visual inspection and comparison with the corresponding surface roughness board under the illumination of 600±200lx, and the inspection distance is 300mm.
The thread-passing parts such as the shuttle handle groove should be smooth, without defects such as notches and sharp edges, and are determined by visual inspection and comparison with the standard sample. 5.13 The inner circle and plane of $42.6mm are not allowed to have defects such as sand holes, and are determined by self-test. 5.14 Electroplated parts shall be inspected according to Article 7.1 of QB/T1572, and painted parts shall be inspected according to Article 4.1 of ZBY17022. 6 Inspection rules
6.1 Products leaving the factory must pass the quality inspection of the manufacturer and be accompanied by an inspection certificate. 6.2 Inspection classification
Product inspection is divided into two categories: factory inspection (delivery inspection) and type inspection (routine inspection). 6.2.1 Factory inspection
When the product is delivered, the consignee has the right to inspect and accept it according to the factory inspection items specified in this standard. 6.2.2 Type inspection
If there is one of the following situations, it is necessary to conduct a comprehensive assessment of product quality and a type inspection should be carried out. a. Trial production and identification of new products or old products transferred to the factory for production; 362
QB/T 2145--1995
b. After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c. Periodic inspection should be carried out once every 6 months of normal production; d. When the product is resumed after a long period of suspension; e. When the factory inspection results are significantly different from the last type inspection; f. When the superior quality supervision agency proposes a requirement for type inspection. 6.2.3 Product quality characteristics and inspection classification
See Table 1 for product quality characteristics and inspection classification. Table 1
Inspection items
5.1§64.55Axis line to $42.6 hole inner wall runout 0.06mm5.2$42.6 inner diameter height 4.6+0.18mm
5.3Inner diameter $42.6+8:8mm
5.4Distance between shuttle bed surrounding plane and shuttle bed foot plane 0.6-8.osmm5.5
Shuttle bed foot inner diameter 64 .55+.mm
Inner diameter of front-open shuttle bed body$51+:mm
Distance between two mounting holes d2.5±0.15mmbZxz.net
5.8Distance between two shuttle bed pin holes of rear-open pole bed body$46.8±0.125mm
$42.6Surface roughness of inner wall of hole and bottom plane of shuttle rack R.5.9
Surface roughness of shuttle bed adjustment plane R,3. 2μm5.10
Surface roughness R of bottom plane A of rear-open shuttle bed body. 5.12 The thread-passing parts of the shuttle handle groove of the rear-open shuttle bed should be smooth and free of sharp edges.
$42.6mm The inner circle and the plane are not allowed to have defects such as sand holes. 5.13
Surface appearance quality of electroplated parts or painted parts
Classification of quality characteristics
Note: The inspection items that are not specified for the front-open shuttle bed or the rear-open shuttle bed are the inspection items for the front-open shuttle bed and the rear-open shuttle bed. 6.3 Factory inspection rules
6.3.1 Sample extraction
Samples should be randomly selected from the inspection batch submitted. 6.3.2 Sampling plan and strictness
The normal inspection sampling plan is shown in Table 2. The strictness is determined according to GB/T2828 4.6 regulations. -iKAoNiKAca-
Inspection classification
Batch range
281～500
501～1200
1201～3200
3201～10000
10001～35000
Inspection level
Sampling plan
Unqualified classification
Number of sample unit inspection items
Qualified quality level (AQL)
Sample size code
Note: ①The sample unit is each shuttle bed body. QB/T 2145-1995
Sample size
②A and R of Class B. Count as unqualified products, and Ac and R of Class C. Count as unqualified number. 6.3.3 Judgment of qualified or unqualified inspection batch R
Normal inspection sampling
Back opening
Front opening
Based on the results of sample inspection, if the number of Class B unqualified products and Class C unqualified 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 unqualified products and Class C unqualified products found in the sample is 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 disposal of unqualified products and batches after inspection shall be in accordance with Article 4.12 of GB/T2828. 6.4 Type inspection rules
6.4.1 Sample extraction
Samples should be extracted from a batch or batches manufactured in this cycle and qualified by factory inspection, and the obtained samples should be guaranteed to represent the manufacturing technology level of this cycle.
6.4.2 Sampling plan
The sub-sampling plan for type inspection is shown in Table 3.
Discrimination level
Sampling plan
Non-conforming classification
Number of inspection items of sample unit
Non-conforming quality level (RQL)
Sample size
Note: ①The sample unit is each shuttle bed body, A
②A. and R. of Class B are counted as non-conforming products, and A. and R. of Class C are counted as non-conforming numbers. 6.4.3 Determination of pass or fail in type inspection364
Single sampling plan
Back opening
Front opening
QB/T 2145-1995
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According to the results of sample inspection, if the number of Class B nonconforming products and the number of Class C nonconforming products found in the sample are both less than or equal to the corresponding qualified judgment number (A.), then the batch is judged to be a qualified batch. If the number of Class B nonconforming products and the number of Class C nonconforming products found in the sample are either greater than or equal to the corresponding unqualified judgment number (R.), then the batch is judged to be an unqualified batch. 6.4.4 Disposal after type inspection
Disposal after type inspection shall be in accordance with Article 4.12 of GB/T2829. 7 Marking, packaging, transportation, storage
7.1 Marking
The product packaging shall have the following markings:
Product model:
b. Parts name;
c. Manufacturer's name:
, Packing date:
e. Standard number;
f. The graphics of "handle with care", "afraid of moisture", "upward", and "stack limit" shall comply with the provisions of GB 191. 7.2 Product inner packaging
The product shall be coated with anti-rust agent before packaging, and packed in paper boxes with moisture-proof paper lined inside. For shuttle bed bodies, 20 pieces shall be packed in one box, and 10 boxes shall be packed in one box, with tar paper lined inside. If there are other requirements for the quantity and form of packaging, they can be negotiated and decided by the supplier and the orderer. 7.3 Packing, transportation, storage
The packaging, transportation, and storage of products shall be carried out in accordance with the provisions of ZBY17004. Additional Notes:
This standard was 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 Sewing Machine Parts Factory No. 4. The main drafters of this standard are Zhu Yi and Chen Changbao.
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