QB/T 1576-1992 Industrial sewing machine GL type blind stitch sewing machine head
Some standard content:
Light Industry Standard of the People's Republic of China
Industrial Sewing Machine
Subject Content and Scope of Application
GL Type Blind Stitch Sewing Machine Head
QB/T 1576—1992
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of GL type blind stitch sewing machine heads.
This standard applies to GL type blind stitch sewing machine heads (hereinafter referred to as "heads"). 2 Reference standards
GB/T 2828
GB/T2829
GB/T 4514
GB/T4515
QB/T 1177
ZBY17004
ZBY17023
3 Terminology
Batch inspection counting sampling procedure and sampling table periodic inspection counting sampling procedure and sampling table Rules for compiling product models of sewing machines
Classification and terminology of stitches
Noise test method for industrial sewing machines
Marking, packaging, transportation and storage of sewing machines Starting torque test method for sewing machine heads
Blind stitchbzxZ.net
The stitches are not obviously exposed on the front side of the sewing material after sewing. 4 Product classification
4.1 Type
This machine head adopts needle bar to pick up the thread, and the thread hook to hook the thread. It consists of a curved needle and a thread hook to form a 103 type stitch (GB/T4515). 4.2 Basic parameters (selected according to each model)
Maximum sewing speed: 1500~2500 stitches/min; Stitch length: 3.2~8.5mm or 2.5~7mm; Prying seam spacing ratio: 1:1, 2:1,
Presser foot drop distance is not less than 7mm,
Needle: GL×1 type NM65~100 (LWX6T*11~*16); Sewing thread: 14.5~7.5tex×3 strands of cotton thread or 14.8~7.4tex×3 strands of polyester-cotton sewing thread; Motor power: not more than 250W.
4.3 Product model
Product model shall comply with GB/T4514.
Example:
Approved by the Ministry of Light Industry of the People's Republic of China on 1992-08-31 260
Implemented on 1993-04-01
5 Technical requirements
5.1 Appearance quality
QB/T1576-1992
Derivation number
Design sequence number
-Top feeding
Transformable
Single-line chain stitch, straight blind stitch, line hook, needle bar thread pick-up for industrial use
5.1.1 The surface of the baking varnish parts shall be flat, with uniform color, and there shall be no obvious cracks, paint flow, bubbles, paint bumps and other defects in the main visible parts. 5.1.2 The surface of the machine head should be free of rust and oil stains, and the labels should be complete and correctly positioned without obvious scars. 5.1.3 There should be no burrs on the exposed parts and screw heads of the machine head. 5.1.4 The electroplated parts should be free of rust and peeling, and its main surface should be free of obvious bubbles, spots, pinholes and burrs, and it should be smooth, flat and basically uniform in color.
5.1.5 The surface of the blackened parts should be uniform in color and should not have defects such as unoxidized spots, sediments, flower spots, scratches and rust. 5.2 Machine performance
5.2.1 The needle swing, stitch length, blind seam depth and thread tension should be adjustable. 5.2.2 The presser foot should be raised and lowered flexibly, and the presser foot should be lowered by no less than 7mm. 5.2.3 The rotary table should be opened and closed flexibly and reliably. 5.2.4 The ratio of the prying seam spacing shall comply with 11,2:1. 5.3 Sewing performance
When the test is carried out under the test conditions specified in 6.3 and Table 1, there shall be no defects such as broken needles, broken threads, skipped stitches, and floating threads. 5.3.1 Prying seam sewing, prying seam spacing ratio 1:1 sewing, sewing length is 400mm. 5.3.2 Prying seam continuous sewing, prying seam spacing ratio 2:1 sewing, sewing length is 400mm. 5.3.3 Thin sewing, sewing length is 400mm, and there shall be no wrinkling 5.3.4 Continuous sewing, sewing length is 3m. 5.4 Running performance
5.4.1 Running noise
5.4.1.1 There shall be no abnormal noise when running at the highest sewing speed without load. 5.4.1.2 The noise sound pressure level shall not be greater than 82dB(A). 5.4.2 When the machine head is unloaded, the starting torque should not be greater than 0.4N·m. 5.5 Accessories and spare parts
The accessories and spare parts equipped with each machine head should comply with the provisions of the instruction manual or packing list. 6 Test method
6.1 Appearance quality
Under the light of 600±200lx, the inspection distance is 300mm, and it is judged by visual inspection. 6.2 Machine performance
6.2.1 The adjustment mechanism is adjusted according to the method specified in the instruction manual in the prying seam item of Article 5.3. 6.2.2 Presser foot drop test: Lower the presser foot and measure it with a special block gauge. It can pass freely. 261
6.2.3 The workbench is judged by hand feeling and visual inspection. QB/T 1576-1992
6.2.4 Prying seam spacing ratio: Test in the prying seam item of Article 5.3. 6.3 Sewing performance
Preparation before the test:
Before the test, clean the surface of the machine head, remove dirt from the needle plate, feed dog and thread passing parts, add lubricating oil, run at the highest sewing speed of 80% for 5 minutes, and then test each item according to the provisions of Table 1; b. Trial sewing and adjustment are allowed before each test. The relevant parts that are adjusted according to the provisions of the instruction manual are not allowed to be adjusted again during the formal test;
The sewing speed is tested with a non-contact speed meter. The sewing speed tolerance during the test is -3%. Table 1
Test items
Stirred stitching
Continuous sewing
Thin sewing
Using machine needle
Using sewing thread
9.5tex×3 strands
Cotton thread or polyester-cotton thread
7.5tex×3 strands
Cotton thread or polyester-cotton thread
6.3.1 Sewing with a prying seam spacing ratio of 1:1
Inspect after sewing as specified in Table 1.
6.3.2 Sewing with a prying seam spacing ratio of 2:1
Inspect after sewing as specified in Table 1.
6.3.3 Sewing with thin sewing
Inspect after sewing as specified in Table 1.
6.3.4 Continuous sewing
No. 130
Medium plain cloth
Polyester cloth
Sewing speed
Highest sewing speed
Highest sewing speed
Highest key speed
Rare high continuous speed
Stitch length
Spacing ratio
Test length
Stagger the upper and lower layers of the test material and stack them together, connect them end to end to form a ring, sew them (circumference Im), and check them after continuous sewing according to the provisions of Table 1. 6.4 Running performance
6.4.1 Running noise
a. No abnormal noise
Remove the feed dog, adjust the stitch length to 5mm, and judge by ear; Noise test
Remove the feed dog, adjust the stitch length to 5mm, and install the microphone according to Figure 1. Test according to QB/T1177. Microphone
Microphone
6.4.2 Starting torque
Test according to ZBY17023.
6.5 Accessories and spare parts
QB/T 1576—1992
Check item by item according to the product manual or packing list. 7 Inspection rules
Each machine head leaving the factory must be inspected and qualified by the quality inspection department of the manufacturer and accompanied by an inspection certificate before leaving the factory. 7.2 Under the presser foot of each machine head, a sewing sample of the continuous stitch of the machine head should be attached. 7.3 The consignee has the right to accept the factory inspection items specified in this standard. If the consignee has other requirements, the supplier and the buyer shall specify them in the order contract.
7.4 Inspection classification
Inspection items, unqualified categories, and inspection classifications shall be specified in Table 2. Unit product is counted as each machine head, category A and B are counted as defective products, and category C is counted as the number of defectives.
Inspection items
Appearance quality
Machine protection performance
Sewing performance
Operation performance
Accessories and spare parts
7.4.1 Factory inspection
Defective categories
7.4.1.1 The sampling plan and strictness of factory inspection shall be in accordance with GB/T2828, see Table 3. Table 3
Inspection level
Sampling plan
Non-conforming classification
Number of unit sample inspection items
Special inspection S-2
Inspection classification
Normal inspection Single sampling
[～25
26～150
151～1200
1201～3200
Qualified quality level AQL
Sample code
QB/T1576-1992
Continued Table 3
Sample size
Factory inspection When a batch fails, the manufacturer shall conduct a full inspection, remove or repair the non-conforming products, and attach a rework record before submitting it for inspection again, but a stricter inspection must be used. If the products still fail to meet the standards when they are resubmitted, the batch of products shall not be submitted for acceptance again. 7.4.2 Type inspection Type inspection must be conducted in one of the following situations: a. Trial production and appraisal of new products; when there are major changes in the design, process or materials used; when products that are not frequently produced are produced again; c. Once every six months during normal continuous production. 7.4.2.2 Samples for type inspection shall be randomly selected from the inspection batch of products produced in the current half year that have passed the factory inspection. The samples shall be fully inspected according to the factory inspection items. If unqualified products are found, they shall be replaced with qualified products, and the reasons shall be analyzed in time and included in the manned type inspection report, but shall not be used as the basis for the appraisal of the type inspection results. 7.4.2.4 The sampling plan for type inspection is shown in Table 4. Table 4
Discrimination level
Sampling plan
Unqualified category
Unit sample inspection items
Unqualified quality level RQL
Sample size
Single sampling
5 When the type inspection fails, it shall be handled in accordance with Article 4.12 of GB/T2829. 7.4.2.5
8 Marking, packaging, transportation, purchase and storage
8.1 Marking
The machine head shall have the following markings:
Product name,
Product trademark;
Product model,
Manufacturer name;
Manufacture number and manufacturing date.
8.2 Packaging, transportation, storage
According to the provisions of ZBY17004.
Additional Notes:
QB/T1576
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 the South China Sewing Machine Industry Company Research Institute. The main drafters of this standard are Huang Yongqiang, Li Bosong and Tan Songhua. 1992
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