This standard specifies the product classification, technical requirements, test methods, shuttle inspection rules and marking, packaging, transportation and storage of household sewing machine shuttles. This standard is applicable to JA, JB, JH type household sewing machine shuttles, and other sewing machine shuttles can be used as a reference. QB/T 2144-1995 Household sewing machine shuttle QB/T2144-1995 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 Examples
QB/T 2144--1995
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of household sewing machine shuttles.
This standard is applicable to JA, JB, and JH household sewing machine shuttles, and other sewing machine shuttles can be used as a reference. 2 Reference standards
GB/T2828 Batch inspection counting sampling sequence and sampling table (applicable to manual continuous batch inspection) GB4342 Metal micro-Vickers hardness test method 3 Product classification
3.1 Type (see Figure 1)
1 Large triangular plane; 2-lower hungry surface, 3-lower plane, 4-axis: 5-shuttle double: 6-needle groove; 7-external map; 8-upper arc surface, 9-needle groove surface; 10-hook line Shuttle tip: 11- take-up curve; 12- tail end 3.2 Basic parameters (see Figure 2)
Approved by China Light Industry Association on October 24, 1995
Purchased on June 1, 1996
4 Technical requirements
4.6h8(ao
QB/T2144-—1995
15H12(+0.18)
1.8+o. 25
The main dimensions of the shuttle should comply with the provisions of Article 3.2. 4.1
4.2 The part in contact with the suture should be smooth and without sharp edges. 4.3 The shuttle surface should be free of rust spots and obvious scars, and the trademark logo should be clear. 4.4 The surface roughness should comply with the provisions of Article 3.2. (60 g
Unit: mm
4.5 The runout of the outer circle and the lower plane to the $4.4mm axis shall comply with the provisions of 3.2. 4.6 The surface hardness shall not be less than 500HV2.
5 Test method
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5.1Φ4.4=8:,g42.6-8.030,g4.6-8.018mm respectively use the measurement range of 0~25,25~50 precision The outer diameter is tested with a micrometer of 0.002mm; 1.8+925mm is tested with a gauge; 13+918mm is tested with a special measuring tool (see Figure 3). Figure 3
5.2 The contact part with the suture is inspected by visual inspection and hand feeling under natural light with an illumination of 600±200lx and a distance of 300mm. 5.3 The appearance of the shuttle and the trademark logo are inspected by visual inspection under natural light with an illumination of 600±200lx and a distance of 300mm. Check. 5.4 The surface roughness is compared by visual inspection with a roughness sample. 5.5 The runout test of the outer circle and the lower plane to the 4.4mm axis is shown in Figures 4 and 5. 355
QB/T2144-1995
5.5.1 The outer circle test position is from the outside of the large triangle plane to the range of 5mm from the tail angle. 5.5.2 The lower plane test position is from 2mm behind the large triangle plane to the range of 5mm from the tail angle. Figure 5
5.6 The surface hardness is tested according to GB4342 or similar methods, and the final arbitration is in accordance with the provisions of GB4342. The test position is any three points on the lower plane.
6 Inspection rules
6.1 The product must be inspected and qualified by the technical inspection department of the manufacturer, and each box must be accompanied by a product certificate before it can be shipped. 6.2 The consignee has the right to conduct acceptance inspection on the submitted inspection batch according to the inspection items and counting sampling inspection plan specified in this standard within the acceptance period specified in the order contract.
6.3 Inspection items, inspection levels, non-conforming categories, and qualified quality levels shall be as specified in Table 1. Table
Inspection items
4. 6h8_8.018
The passing part is smooth without sharp correction
Surface hardness 500HV2
042.6h8-8.039
Ground 4.4d10二8:88
13H12+8
Roughness of two planes and outer circle
Outer circle against 4.4 axis
Lower plane against 4 axis
Appearance without rust and obvious scars, clear trademarkbzxz.net
Technical requirements
Test method
Inspection level
Unqualified classification
Qualified quality level
6.4 Products are delivered in batches, single The product is each shuttle, and the sample should be randomly selected from the batch submitted for inspection. The sampling plan type is a one-time sampling plan.
6.5 The strictness of the sampling plan shall be in accordance with GB/T2828. The sampling plan for a normal inspection shall be in accordance with Table 2. 356
91~150
151-280
281500
5011200
12013200
320110000
QB/T2144-
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6.6 Batch qualification judgment, the first and second groups are counted by the number of unqualified products, and the third group is counted by the number of unqualified products. All qualified batches are qualified, and one group is unqualified, which means the batch is unqualified.
6.7 The batches submitted for inspection that are judged as unqualified shall be fully inspected by the manufacturer, and after removing the unqualified products, they shall be reassembled for inspection. When submitting for inspection, re-inspection records shall be attached. If the batch is still judged as unqualified, the batch of products shall not be accepted again. 6.8 In the batches judged as qualified, the unqualified products found in the inspection shall be replaced with qualified products of the same category or refurbished to qualified products. 7 Marking, packaging, transportation, storage
7.1 The shuttle shall have the manufacturer's trademark. The packaging carton shall indicate the product model, name, quantity, manufacturer's name and address, production date, adopted standard number and quality certification mark 7.21
7.3 The product shall be treated with rust prevention before packaging.
7.4 The product shall be packed with neutral wax paper or plastic bags and then packed in special cartons. 7.5 The product shall be kept clean and dry during transportation, loading and unloading, and shall not be thrown, rained, or shipped together with corrosive items. 7.6 The product must be stored in a dry, ventilated room that is protected from turning over. The relative humidity should not be greater than 80%. It is forbidden to store it with corrosive items.
7.7 The product quality must be guaranteed within six months of normal storage and it must not rust. Additional remarks:
This standard was proposed by the Quality Standards Department of the China Light Industry Association. This standard is under the jurisdiction of the National Sewing Machine Standardization Center. This standard was drafted by Shanghai Huacui Sewing Machine Parts Factory. The main drafter of this standard is Xu Bing.
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