QB/T 2380-1998 Industrial sewing machine GC type automatic thread trimmer high speed lockstitch sewing machine
Some standard content:
Based on QB/T2380-1998
GC High-speed Lockstitch Sewing Machine Head", the technical requirements of this standard are added to QB/T2256--1996 "Automatic Function Requirements and Safety Performance Requirements for Industrial Sewing Machines: Automatic function requirements include: automatic needle stop position, automatic speed regulation, automatic thread trimming, etc.; safety performance requirements comply with the provisions of relevant national standards. This standard is proposed by the Industry Management Department of the State Bureau of Light Industry. This standard is under the jurisdiction of the National Sewing Machine Standardization Center. The drafting units of this standard are: Shanggong Co., Ltd., Shanghai Sewing Machine Research Institute. The main drafters of this standard are: Zhou Yuzhu, Zhou Kaiming, Huang Congrui. 431wwW.bzxz.Net
Light Industry Standard of the People's Republic of China
Industrial sewing machine GC type automatic thread trimmer high-speed lockstitch sewing machine 1
QB/T2380-1998
This standard specifies the product classification, technical requirements, test methods, inspection specifications, marking, packaging, transportation and storage of GC type automatic thread trimmer high-speed lockstitch sewing machines.
This standard applies to GC type automatic thread trimming high-speed lockstitch sewing machines (hereinafter referred to as "lockstitch sewing machines") for sewing medium-thick, thin and thick materials such as cotton, linen, wool and chemical fiber fabrics.
2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should discuss the possibility of using the latest versions of the following standards. GB/T406-1993 Cotton gray cloth
GB/T2828—1987
Batch inspection counting sampling procedures and sampling tables (applicable to the inspection of continuous batches) Periodic inspection counting sampling procedures and sampling tables (applicable to the inspection of production process stability) GB/T 2829--1987
GB/T 3797-—1989
GB/T 4515--1984
GB 4706.1--1992
GB/T 68351986
Electronic control equipment Part 2: Electric control equipment incorporating electronic components Classification and terminology of stitches
General safety requirements for household and similar electrical appliances Cotton sewing thread
GB/T16469-1996 Sewing machine packaging
Method of testing noise level of industrial sewing machines
QB/T 1177-1991
QB/T 1178--1991
Method of testing vibration of industrial sewing machines
Method of testing seam shrinkage and seam material migration of industrial sewing machines QB/T 2045—1994
QB/T2251-1996
Sewing machine model sewing rules
QB/T 2252-1996
Sewing machine head starting torque test method
QB/T 2256--1996
Industrial sewing machine GC type high-speed lockstitch sewing machine head ZBY 17022-1989
Technical conditions for baking varnish for sewing machines
3 Product classification
3.1 Type
This machine is a flat-bed machine body, adopts connecting rod thread picking, rotary hook thread hooking, and bottom feeding to form 301 stitches specified in GB/T4515, and adopts microcomputer control system to realize automatic speed regulation, automatic needle stop position, and automatic thread trimming. 3.2 Basic parameters
Basic parameters are as specified in Table 1.
Approved by the State Bureau of Light Industry on 1998~05-14
Implemented on 1999-03-01
Basic parameters
Maximum sewing speed, needles/min
Maximum stitch length, mm
Presser foot lifting height
Used sewing thread
(GB/T 6835)
Needle used
GC3×1 type wear GC3X2 type
Working environment
3.3Model representation
QB/T2380—1998
Medium and thick material machine
Handheld ≥4.5
Basic parameters
Thin material machine
Handheld ≥4
Knee lifted ≥9
147.5ex×3~4 Strand (42~80s/34) cotton thread or other types of sewing thread
Nm60110
Nm60~70
Power supply: should comply with 3.2.6.1 of GB/T3797-1989: Temperature: 5℃~40℃#
Humidity: Relative humidity 40%r·h~85%r·h (25℃ without condensation), Pollution: should comply with 3.2.2 of GB/T3797-1989. According to QB/T2251, the design sequence and derived number group are based on the use object and mechanism characteristics. Example:
4 Technical requirements
4.1 Basic requirements
4.1.1 Appearance quality
Derivation number
Design sequence number
Raw material machine
Handheld 5.5
Knee lifted ≥12
88~14.5tex×2~4 strands (20
40s/2~4) Cotton thread or other
similar sewing thread
Nm120~140
Straight seam, lockstitch, horizontal hook hook, connecting rod thread pick-up, bottom feeding, flat body industrial
4.1.1.1 The surface quality of the baking paint parts shall meet the following requirements: a) The paint surface shall be flat and uniform in color. The main visible parts shall be free of obvious defects such as paint flow, blistering and paint contact. b) Impact strength of coating film
should meet the requirements of 3.3 of ZBY17022-1989. c) Wear resistance of coating film
should meet the requirements of 3.5 of ZBY17022--1989. d) Hardness of coating film
should meet the requirements of 3.6.1 of ZBY17022-1989. 4.1.1.2 The surface of electroplated parts should be flat, with basically uniform color, and should not have rust or separation. There should be no obvious bubbles, pinholes and hair residue on the main surface.
4.1.1.3 The surface of blackened parts should have uniform color, and should not have unoxidized spots, sediments, spots, scratches or rust. 4.1.1.4 Exposed parts and components should not have burrs. 4.1.1.5 The surface of plastic parts should have basically uniform color, and should not have obvious shrinkage or scratches. 433
QB/T 23801998
4.1.1.6 The surface of the table should be flat and smooth, without degumming, stains or scratches. 4.1.1.7 The surface of the controller should be flat and of basically uniform color, without obvious dents, scratches, cracks or deformation. 4.1.2 Machine performance
4.1.2.1 The stitch length, thread tension and presser foot pressure can all be adjusted. 4.1.2.2 After the presser foot is lifted and locked, it should have a thread loosening effect. 4.1.2.3 After the thread is trimmed, the needle should automatically be in the upper needle position. 4.1.2.4 The lockstitch sewing machine should be able to automatically adjust the speed, with the minimum speed not exceeding 180 stitches/min and the maximum speed not less than that specified in Table 1. 4.1.2.5 When the stitch length is the maximum, the starting force of the reverse feed wrench should not exceed 13N. After being pressed and released, the reverse feed wrench should be able to completely reset.
4.1.2.6 The stitch length of manual forward and reverse stitches should be basically consistent, and the relative error of the length should not exceed 13%. 4.1.2.7 The maximum stitch length should comply with the provisions of Table 1. 4.1.3 Sewing performance
4.1.3.1 Ordinary sewing
Sewing length is 1000mm, sewing 2 times, there should be no broken needles, broken threads, skipped stitches, or floating threads. 4.1.3.2 Continuous sewing
Sewing length is 5000mm, there should be no broken needles, broken threads, skipped stitches, or floating threads. 4.1.3.3 Layer sewing
Sewing length is 500mm, sewing 5 times, there should be no broken needles, broken threads, skipped stitches, or floating threads. 4.1.3.4 Shrinkage of seam for thin material machine
a) Shrinkage rate of upper layer shall not exceed 1.5%;
b) Shrinkage rate of lower layer shall not exceed 2.5%.
4.1.3.5 Creep rate of seam material layer
For thin material and medium and thick material machine, it shall not exceed 1%.
4.1.3.6 Number of stitch skew
For sewing length of 300mm, the number of stitch skew shall not exceed 3. 4.1.3.7 High and low speed sewing
The stitch length shall be basically the same, and the relative error of its length shall not exceed 13%. 4.1.4 Thread trimming performance
4.1.4.1 When sewing, stop midway (before thread trimming), and the needle shall automatically be in the lower needle position. 4.1.4.2 Automatic thread trimming 100 times shall meet the following requirements: a) The thread shall be cut off each time the thread is trimmed;
b) The length of the thread left on the sewing material after trimming is not more than 8mm c) The length of the thread left on the needle hole after trimming is not more than 42mm. 4.1.5 Running performance
4.1.5.1 Operation noise
a) At the highest sewing speed, there should be no abnormal noise; b) The noise sound pressure level should not exceed 85dB(A)). 4.1.5.2 The vibration displacement value should not exceed 300m. 4.1.5.3 The starting torque at any position should not exceed 0.40N·m. 4.1.5.4 Needle stop position accuracy
a) The upper needle stop position accuracy after thread trimming is not greater than 7°; b) The lower needle stop position accuracy before thread trimming is not greater than 22.5°. 4.1.5.5 The oil supply and return of the lubrication system should be good. 434
QB/T 2380---1998
4.1.5.6 The sealing performance should be good, and the joint surfaces should not leak oil. 4.1.6 Mechanism matching clearance
4.1.6.1 The clearance in the moving direction of the thread picking mechanism should not exceed 0.10mm. 4.1.6.2 The clearance of the thread picking mechanism in the plane direction shall not be greater than 0.25mm. 4.1.6.3 The clearance of the feeding mechanism in the moving direction shall not be greater than 0.13mm. 4.1.6.4 The clearance of the feeding mechanism in the lifting direction shall not be greater than 0.10mm. 4.1.6.5 The clearance of the piercing mechanism in the moving direction shall not be greater than 0.06mm. 4.1.6.6 The clearance of the hooking mechanism in the circumferential direction shall not be greater than 45°. 4.1.7 After the machine head has been running for 6 hours, the clearance change of each main mechanism in the moving direction of the thread picking mechanism shall not be greater than 0.05mm. 4. 1.7. 13
4.1.7.2 The clearance of the thread picking mechanism in the plane direction shall not be greater than 0.05mm. 4.1.7.3 The clearance of the feeding mechanism in the moving direction shall not be greater than 0.07mm. 4.1.7.4 The clearance of the feeding mechanism in the lifting direction shall not be greater than 0.07mm. 4.1.7.5 The moving direction of the piercing mechanism should not exceed 0.03mm. 4.1.7.6 The circumferential direction of the hooking mechanism should not exceed 5°. 4.1.8 Safety performance
4.1.8.1 Anti-interference
should comply with the provisions of 3.10.6.1a3.10.6.2 in GB/T3797-1989. 4.1.8.2 Insulation resistance
should comply with the provisions of 3.8.1 in GB/T3797-1989. 4.1.8.3 Dielectric strength
should comply with the provisions of 3.8.2 in GB/T3797-1989. 4.1.8.4 Protection against electric shock
should comply with the provisions of 3.10.1 in GB/T3797-1989. 4.1.8.5 Grounding and grounding mark
shall comply with the provisions of 3.10.7.1 of GB/T3797-1989. 4.1.8.6 Wiring
shall comply with the provisions of 3.12.4 of GB/T3797--1989. 4.1.8.7 Temperature rise
shall comply with the provisions of 11 of GB4706.1-1992, and the temperature rise of any part of the motor and control box housing shall not exceed 35K. 4.1.8.8 Stall protection
When the machine head is locked or other reasons cause the control system to fail to receive the speed signal, the control system shall automatically enter the protection state within 2.5s.
4.1.9 Accessories and spare parts
The accessories and spare parts of each lockstitch sewing machine shall comply with the provisions of the product manual or packing list. 4.2 Extended requirements
4.2.1 Needle position selection function
After receiving the upper and lower needle position instructions, the flat-bed sewing machine should be able to automatically locate at the corresponding needle position. 4.2.2 Automatic presser foot lifting function
After the flat-bed sewing machine trims the thread, it should be able to automatically lift the presser foot. 4.2.3 Stop and immediately trim the thread function
When the flat-bed sewing machine stops during sewing, it should be able to trim the thread immediately. 4.2.4 Manual reverse stitch function
QB/T 2380-1998
During sewing, press the manual reverse stitch button, the flat-bed sewing machine should be able to automatically reverse stitch. 4.2.5 Thread pulling function
After trimming the thread, the flat-bed sewing machine should be able to automatically pull the thread. 4.2.6 Automatic reverse stitch compensation function
When the flat-bed sewing machine automatically reverses and sews, it should be able to compensate 0.5~2 stitches. 4.2.7 Automatic reinforcement sewing function
Press the automatic reverse sewing button, the sewing machine should be able to automatically reinforce the sewing at the beginning or end. 4.2.8 Continuous reverse sewing function
Press the continuous reverse sewing button, the sewing machine should perform continuous reverse sewing according to the sewing mode set by the control system. 4.2.9 Counting sewing function
Press the counting button, the sewing machine should stop automatically after sewing the set number of stitches. 4.2.10 Slow start function
Press the slow start button, the sewing machine should be able to start slowly according to the set number of stitches. 5 Test methods
5.1 Basic requirements
5.1.1 Appearance quality
5.1.1.1 Impact strength of coating
According to 4.3 of ZBY17022-1989.
5.1.1.2 Wear resistance of coating
According to 4.5 of ZBY17022-1989. 5.1.1.3 Hardness of coating
According to 4.6 of ZBY17022-1989.
5:1.1.4 Other appearance quality is determined by daily test under the illumination of (600±200) x-ray, with the inspection distance of 300mm. 5.1.2 Machine performance
5.1.2.1 The adjustment of stitch length, thread tension and presser foot pressure are all adjusted and checked during the sewing performance test. 5.1.2.2 The thread loosening effect after the presser foot is lifted
According to 5.2.2 of QB/T2256-1996. 5.1.2.3 Needle position after thread cutting
Visual inspection.
5.1.2, 4 Automatic speed regulation
Under rated voltage and rated rate, the sewing machine presser foot is lowered, no thread is threaded, and photosensitive paper is attached to the upper wheel, and the tachometer is used for testing. 5.1.2.5 The starting pressure of the reverse feed wrench
shall be carried out in accordance with the provisions of 5.2.3 of QB/T2256-1996. 5.1.2.6 The relative error of the reverse and forward stitch length shall be carried out in accordance with the provisions of 5.2.4 of QB/T2256--1996. 5.1.2.7 The maximum stitch length
shall be carried out in accordance with the provisions of 5.2.5 of QB/T2256-1996. 5.1.3 Sewing performance
a) Before the test, clean the outer surface of the machine head, remove dirt from the needle plate, feed dog, hook and thread passing part, add lubricating oil, run at 80% of the maximum sewing speed for 5 minutes, and then test each item according to the test conditions specified in Table 2. ) The sewing speed is tested with a non-contact speed meter, and the test sewing speed tolerance is 3%. c) Before each test, it is allowed to adjust the presser foot pressure, thread tension, stitch length, and test sewing, but no further adjustment is allowed during the formal test. 436
Project name
Maximum stitch
Reverse sewing
Stitch length
Relative error
High and low speed lines
Trace length error
Ordinary sewing
Stitch skew
Continuous sewing
Trimming stitch
Material layer creep rate
And seam shrinkage
Medium and thick material machine
Thin material machine
Thick material machine
Medium and thick material machine
Thin material machine|| tt||Thick material machine
Medium thick material machine
Thin material machine
Thick material machine
Medium thick material machine
Thin material machine
Thick material machine
Medium thick material machine
Thin material machine
Thick material machine
Medium thick material machine
Thin material machine
Thick material machine
Medium thick material machine
Thin material machine
Thick material machine
Medium thick material machine
Thin material machine
Thick material machine
QB/T 2380-1998
Test conditions for machine performance and sewing performance
Test materials (GB/T406)
Fine cloth
Polyester-cotton cloth
Fine canvas
Fine cloth
Cotton cloth
Fine canvas
Fine cloth
Polyester-cotton cloth
Fine canvas
Fine cloth
Varnished cotton cloth
fine canvas
fine flat cloth
polyester cotton cloth
fine canvas
605611
yarn khaki
polyester cotton cloth
fine canvas
605611
single-sided yarn khaki
polyester cotton cloth
fine canvas
fine flat cloth
polyester cotton cloth||tt| |Fine canvas
Size mm
300×50
500×100
560×100
1000X100||tt ||500×100
600×90
560X100
500×100
2-6-2-6-2
4-1 2-4-12-4
Perform according to the provisions of QB/T2045
Stitch length
Sewing speed
Needle/min
Up to 80%
Up to 80%
Up to and up to 40%
Up to 90%
Thread trimming speed
5.1.3.1 Ordinary sewing
QB/T 2380—1998
Perform according to the provisions of 5.3.1 of QB/T2256---1996. 5.1.3.2 Continuous sewing
Perform according to the provisions of 5.3.3 of QB/T2256—1996. 5.1.3.3 Layer sewing
Perform according to 5.3.2 of QB/T2256-1996. 5.1.3.4 Seam shrinkage
Perform according to QB/T2045.
5.1.3.5 Sewing material layer creep
Perform according to QB/T2045.
5.1.3.6 Stitch skew
Perform according to 5.3.5 of QB/T2256-1996. 5.1.3.7 For high and low speed sewing, the relative error of stitch length shall be carried out according to 5.3.4 of QB/T2256-1996. 5.1.4 Thread trimming performance
5.1.4.1 The needle position before thread trimming shall be determined by visual inspection during normal sewing. 5.1.4.2 The sewing length of each time shall not be less than 100mm, and shall be carried out in the following manner: a) Cut the sewing thread and make a visual judgment;
b) After cutting the thread, the length of the sewing thread left on the sewing material shall be measured with a ruler; c) After cutting the thread, the length of the sewing thread left on the needle hole shall be measured with a ruler. 5.1.5 Operation performance
5.1.5.1 Operation noise
a) At the highest sewing speed, there shall be no abnormal noise, and the ear listening method shall be used for inspection; b) The noise sound pressure level shall be tested in accordance with the provisions of QB/T1177. 5.1.5.2 The vibration displacement value shall be tested in accordance with the provisions of QB/T1178. 5.1.5.3 Starting torque
shall be carried out in accordance with the provisions of QB/T2252.
5.1.5.4 Needle stop accuracy
a) Turn the upper wheel, take the highest position of the needle bar as the main axis rotation zero position, that is, 0°, and stick the adhesive paper engraved with degrees on the upper wheel; b) Fix the pointer on the housing;
c) After trimming the thread, visually observe the upper needle stop angle, test five times, and take the average error value, which all meet the specified requirements; d) Stop halfway (before trimming the thread), visually observe the lower needle stop angle, test five times, and take the average error value, which all meet the specified requirements. 5.1.5.5 Lubrication and sealing
Perform according to the provisions of 5.4.5 in QB/T2256-1996. 5.1.6 Mechanism matching clearance
Perform according to the provisions of 5.5 in QB/T2256-1996. 5.1.7 The change in the gap after the machine head is running
shall be carried out in accordance with the provisions of 5.6 of QB/T2256-1996. 5.1.8 Safety performance
5.1.8.1 Anti-interference
shall be carried out in accordance with the provisions of 4.14.1.1 and 4.14.2 of GB/T3797-1989. 5.1.8.2 Insulation resistance
shall be carried out in accordance with the provisions of 4.3 of GB/T3797-1989. 438
5.1.8.3 Dielectric strength
QB/T2380-1998
shall be carried out in accordance with the provisions of 4.4 of GB/T3797--1989. 5.1.8.4 Protection against electric shock
shall be determined by visual inspection.
5.1.8.5 Grounding and grounding mark
For grounding measurement, use a grounding resistance tester, use a working loop current of 25A to pass between the grounding terminal and the easily accessible metal parts, and measure its grounding resistance value. Grounding mark, visual inspection. 5.1.8.6 Wiring
Visual inspection.
5.1.8.7 Temperature rise
Perform in accordance with 11 of GB4706.1-1992. 5.1.8.8 Stall protection
Turn the machine head over, disengage the belt, and use a stopwatch to test the stall protection time. 5.1.9 Accessories and spare parts
Check each item according to 4.1.9, not less than the specified number. 5.2 Extended requirements
5.2.1 Needle position selection function
Press the upper and lower needle position selection switches, and stop the sewing machine in the middle position of the pedal to visually determine whether the stop position of the sewing machine is consistent with the position selected by the needle position selection switch.
5.2.2 Automatic presser foot lifting function
During sewing (after thread trimming), visually determine. 5.2.3 Stop and immediately trim thread function
Stop during sewing and visually determine.
5.2.4 Manual reverse sewing function
Press the manual reverse sewing button and visually determine whether the sewing machine is in the reverse sewing state. Release the manual reverse sewing button and visually determine whether the sewing machine returns to the forward sewing state.
5.2.5 Thread pulling function
After the sewing machine executes the thread trimming function, visually determine. 5.2.6 Automatic reverse stitching function
After setting the number of stitches for 0.5 to 2 stitches, press the automatic reverse stitching button and make a visual judgment. 5.2.7 Automatic reinforcement stitching function
Press the automatic reinforcement stitching button and make a visual judgment. 5.2.8 Continuous reverse stitching function
Press the continuous reverse stitching mode button and make a visual judgment. 5.2.9 Counting sewing
Set the number of stitches, press the counting button and make a visual judgment. 5.2.10 Slow start
Set the number of stitches, press the slow start button and make a visual judgment. 6 Inspection rules
, 6.1 The products leaving the factory shall be inspected and qualified by the enterprise's quality inspection department and be accompanied by an inspection certificate. A continuous stitch seam sample shall be attached under the presser foot. The seam sample size (l×b) is 100mm×30mm. 6.2 All the expansion requirements specified for the flat-bed sewing machine shall be qualified. 439
6.3 Inspection classification
QB/T23801998
Product inspection is divided into factory inspection (delivery inspection) and type inspection (routine inspection). 6.3.1 Factory inspection
When the product is delivered, the consignee has the right to conduct acceptance according to the factory inspection items specified in this standard. 6.3.2 Type inspection
In the following cases, the product quality must be fully evaluated and type inspection should be carried out: a) Trial production 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) Inspection should be carried out periodically every three 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. 6.3.3 Product inspection items, non-conforming classification and inspection classification See Table 3 for product inspection items, non-conforming classification and inspection classification. Table 3 Inspection items, non-conforming categories and inspection category numbers
Appearance quality
Inspection items from
Painted parts
Note) Surface of painted parts
b) Impact spot resistance of coating
c) Wear resistance of coating
d) Hardness of coating
Surface of electric magnesium parts
4.1.1.3 Surface of parts
4. 1. 1. 4
Surface of external parts and components
Surface of plastic parts
Surface of table
Surface of control box
Stitch length, thread tension, etc.
4.1.2.2 Thread loosening effect
Machine performance 4.1.2.4
Sewing performance
Needle is automatically in the upper needle position
Starting speed
Starting force of reverse feed wrench
Relative error of stitch length
Maximum stitch length
Ordinary sewing
4.1.3.2 Continuous sewing
4.1.3.3
Layer sewing Sewing
Unqualified classification
Inspection classification
Sewing performance
Thread trimming performance
Operation performance
Matching
Variation
QB/T2380-1998
Table 3 (continued)
Inspection items
Seam shrinkage (thin material machine)
Seam material layer creep rate (thin material, medium and thick material)
Stitch skew number
High and low speed sewing
Stop halfway, the machine needle should be in the lower needle position
Requirements after 100 automatic thread trimmings
No abnormal noise
4. 1.5. 1b
Noise sound pressure level
4.1.5.2Vibration displacement value
4.1.5.3Starting torque
Needle stop accuracy
Oil supply and oil return
No oil seepage on each joint surface
Clearance in the direction of movement of thread take-up mechanism
Clearance in the plane direction of thread take-up mechanism
Clearance in the direction of movement of feeding mechanism
Clearance in the direction of lifting teeth of feeding mechanism
Image in the direction of movement of residual material mechanism
Clearance in the circumferential direction of thread hooking mechanism
Direction of movement of thread take-up mechanism
4.1.7.2 Planar direction of thread take-up mechanism
4.1.7.3 Direction of movement of feeding mechanism
Direction of teeth of feeding mechanism
4.1.7.5 Direction of movement of material removing mechanism
Safety requirements
Circumferential direction of hooking mechanism
Anti-interference
Insulation resistance
Dielectric strength
Protection against electric shock
Grounding and grounding mark
Accessories and spare parts4.1.9
Stuck protection
Unqualified classification
Inspection classification
Extended requirements
6.4 Factory inspection rules
Sample defect
QB/T 2380-1998
Table 3 (end)
Inspection items
Needle position selection function
4.2.2 Automatic presser foot pick-up function
Stop and immediately trim thread function
Hand-touch reverse stitching function
Thread dialing function
Automatic reverse stitching function
Automatic reinforcement stitching function
Continuous reverse stitching function
Counting sewing function
4.2.10 Optimal start function
Samples should be randomly selected from the inspection batch submitted. 6.4.2 Sampling plan and strictness
Unqualified classification
The sampling plan for normal inspection is shown in Table 4, and the strictness is in accordance with 4.6 of GB/T2828-1987. Table 4 Factory inspection sampling plan
Inspection level
Sampling plan
Unqualified classification
Number of inspection items in sample unit
Qualified quality level (AQL)
Batch
26~150
1511200
1201-3500
The sample unit is each sewing machine.
2A, R. Count as unqualified products B, C A, R. Count as unqualified number. S-2
Normal inspection one-time sampling
Inspection classification
3*Indicates the use of the sampling plan below the header. When the sample size of the sampling plan is equal to or greater than the batch size, it shall be implemented according to 4.11.4b of GB/T28281987.
indicates the use of the sampling scheme above the arrow. 6.4.3 Judging whether the inspection batch is qualified or unqualified According to the results of the sample inspection, if the number of Class A unqualified products and the number of Class B and Class C unqualified products found in the sample are respectively 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 A unqualified products and the number of Class B and Class C unqualified products found in the sample are respectively greater than or equal to the corresponding unqualified judgment number (R), then the inspection batch is judged to be an unqualified batch.3 Starting torque
Needle stop accuracy
Oil supply and oil return
No oil leakage on all joint surfaces
Clearance in the direction of movement of thread take-up mechanism
Clearance in the plane direction of thread take-up mechanism
Clearance in the direction of movement of feeding mechanism
Clearance in the direction of lifting teeth of feeding mechanism
Image in the direction of movement of residual material mechanism
Clearance in the circumferential direction of thread hooking mechanism
Direction of movement of thread take-up mechanism
4.1.7.2 Planar direction of thread take-up mechanism
4.1.7.3 Direction of movement of feeding mechanism
Feeding mechanism snapping direction
4.1.7.5 Movement direction of feeding mechanism
Safety requirements
Circular direction of hooking mechanism
Anti-interference
Insulation resistance
Dielectric strength
Protection against electric shock
Grounding and grounding mark
Accessories and spare parts4.1.9
Stuck protection
Unqualified classification
Inspection classification
Extended requirements
6.4 Factory inspection rules
Sample defects
QB/T 2380-1998
Table 3 (end)
Inspection items
Needle position selection function
4.2.2 Automatic presser foot pick-up function
Stop and immediately trim thread function
Hand-touch reverse stitching function
Thread dialing function
Automatic reverse stitching function
Automatic reinforcement stitching function
Continuous reverse stitching function
Counting sewing function
4.2.10 Optimal start function
Samples should be randomly selected from the inspection batch submitted. 6.4.2 Sampling plan and strictness
Unqualified classification
The sampling plan for normal inspection is shown in Table 4, and the strictness is in accordance with 4.6 of GB/T2828-1987. Table 4 Factory inspection sampling plan
Inspection level
Sampling plan
Unqualified classification
Number of inspection items in sample unit
Qualified quality level (AQL)
Batch
26~150
1511200
1201-3500
The sample unit is each sewing machine.
2A, R. Count as unqualified products B, C A, R. Count as unqualified number. S-2
Normal inspection one-time sampling
Inspection classification
3*Indicates the use of the sampling plan below the header. When the sample size of the sampling plan is equal to or greater than the batch size, it shall be implemented according to 4.11.4b of GB/T28281987.
indicates the use of the sampling scheme above the arrow. 6.4.3 Judging whether the inspection batch is qualified or unqualified According to the results of the sample inspection, if the number of Class A unqualified products and the number of Class B and Class C unqualified products found in the sample are respectively 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 A unqualified products and the number of Class B and Class C unqualified products found in the sample are respectively greater than or equal to the corresponding unqualified judgment number (R), then the inspection batch is judged to be an unqualified batch.3 Starting torque
Needle stop accuracy
Oil supply and oil return
No oil leakage on all joint surfaces
Clearance in the direction of movement of thread take-up mechanism
Clearance in the plane direction of thread take-up mechanism
Clearance in the direction of movement of feeding mechanism
Clearance in the direction of lifting teeth of feeding mechanism
Image in the direction of movement of residual material mechanism
Clearance in the circumferential direction of thread hooking mechanism
Direction of movement of thread take-up mechanism
4.1.7.2 Planar direction of thread take-up mechanism
4.1.7.3 Direction of movement of feeding mechanism
Feeding mechanism snapping direction
4.1.7.5 Movement direction of feeding mechanism
Safety requirements
Circular direction of hooking mechanism
Anti-interference
Insulation resistance
Dielectric strength
Protection against electric shock
Grounding and grounding mark
Accessories and spare parts4.1.9
Stuck protection
Unqualified classification
Inspection classification
Extended requirements
6.4 Factory inspection rules
Sample defects
QB/T 2380-1998
Table 3 (end)
Inspection items
Needle position selection function
4.2.2 Automatic presser foot pick-up function
Stop and immediately trim thread function
Hand-touch reverse stitching function
Thread dialing function
Automatic reverse stitching function
Automatic reinforcement stitching function
Continuous reverse stitching function
Counting sewing function
4.2.10 Optimal start function
Samples should be randomly selected from the inspection batch submitted. 6.4.2 Sampling plan and strictness
Unqualified classification
The sampling plan for normal inspection is shown in Table 4, and the strictness is in accordance with 4.6 of GB/T2828-1987. Table 4 Factory inspection sampling plan
Inspection level
Sampling plan
Unqualified classification
Number of inspection items in sample unit
Qualified quality level (AQL)
Batch
26~150
1511200
1201-3500
The sample unit is each sewing machine.
2A, R. Count as unqualified products B, C A, R. Count as unqualified number. S-2
Normal inspection one-time sampling
Inspection classification
3*Indicates the use of the sampling plan below the header. When the sample size of the sampling plan is equal to or greater than the batch size, it shall be implemented according to 4.11.4b of GB/T28281987.
indicates the use of the sampling scheme above the arrow. 6.4.3 Judging whether the inspection batch is qualified or unqualified According to the results of the sample inspection, if the number of Class A unqualified products and the number of Class B and Class C unqualified products found in the sample are respectively 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 A unqualified products and the number of Class B and Class C unqualified products found in the sample are respectively greater than or equal to the corresponding unqualified judgment number (R), then the inspection batch is judged to be an unqualified batch.
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