ICS61.080
Classification number: Y17
Registration number: 16394-2005
Light Industry Standard of the People's Republic of China
QB/T 1515-2005
Replaces QB/T1515-1992
Industrial sewing machine
High-speed overedging sewing machine head
Industrial sewing machine
High-speed overedging sewing machine headPublished on 2005-07-26
National Development and Reform Commission of the People's Republic of ChinaImplemented on 2006-01-01
QB/T1515-2005
This standard is a revision of QB/T1515-1992 "Industrial sewing machine GN type high-speed overedging sewing machine head". Compared with QB/T1515-1992, this standard has the following major changes: the original standard name is changed to "Industrial Sewing Machine High-speed Overlock Sewing Machine Head"; Chapter 2 "Reference Standards" of the original standard is modified; Chapter 3 "Terms and Definitions" of the original standard is modified or deleted; the "Basic Parameters" of the original standard is modified; 4 requirements are added to "Machine Performance"; the noise sound pressure level in "Operation Performance" is modified according to different rotation speeds. When the maximum sewing speed is not more than 5500 stitches/minute, the noise The sound pressure level should not exceed 80dB (A): When the maximum sewing speed is greater than 5500 stitches/min and not greater than 6500 stitches/min, the noise sound pressure level should not exceed 82dB (A); when the maximum sewing speed is greater than 6500 stitches/min, the noise sound pressure level should not exceed 85dB (A); the content of "test method" has been modified and added; the product standard number mark content has been added to the "mark": the inspection rules are compiled in accordance with the provisions of GB/T2828.1-2003 and GB/T2829-2002. This standard is proposed by the China Light Industry Federation. This standard is developed by the National Sewing Machine Standardization Center. The drafting units of this standard are: Zhejiang Xinjieke Sewing Machine Co., Ltd., Tianjin Tiangong Sewing Machine Co., Ltd., Xi'an Standard Industry Co., Ltd., Shanghai Sewing Machine Research Institute, and National Sewing Machine Quality Supervision and Inspection Center. The main drafters of this standard are: Qiu Weiming, Chu Shoushan, Zhang Min, Wang Weigang, and Zhang Jian. This standard replaces the light industry standard QB/T1515-1992 "GN type high-speed overlock sewing machine head for industrial sewing machines" issued by the former Ministry of Light Industry from the date of implementation.
1 Scope
Industrial sewing machines
, high-speed overlock sewing machine heads
QB/T1515-2005
This standard specifies the classification, requirements, test methods, inspection rules and marking, packaging, transportation and storage of high-speed overlock sewing machine heads. This standard applies to high-speed overlock sewing machine heads for overlocking and overlocking of sewing materials (hereinafter referred to as "heads"). 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced documents, the latest version shall apply to this standard. GB/T 191-2000
Pictorial marking for packaging, storage and transportation
Inspection procedures by sampling by attributes
GB/T2828.1-2003
GB/T2829--2002
GB/T4515-1984
GB/T6835—1997
GB/T 6836-1997
GB 9969.1-1998
GB/T16469-1996
QB/T 1177-1991
QB/T1178-1991
QB/T1572-1992
QB/T2251-1996
QB/T2252-1996
QB/T2505-2000
QB/T2528-2001
QB/T26102003
3 Terms and definitions
Part 1: Sampling plan for batch inspection based on acceptance quality limit (AQL) Sampling procedures and tables for periodic inspection by attributes
Classification and terminology of stitches
Cotton sewing thread| |tt||Polyester sewing thread
Industrial product instruction manual General
Sewing machine packaging
Test method for noise level
Industrial sewing machine
Industrial sewing machine
Sewing machine parts
Test method for vibration
General technical conditions for electroplating
Rules for compiling sewing machine models
Test method for starting torque of sewing machine head
Technical conditions for blackening of sewing machine parts
Technical conditions for coating of sewing machines
Test method for oil leakage of industrial sewing machines Part 1: Test method for oil leakage of overlock sewing machines The following terms and definitions apply to this standard. 3.1
Differential ratio
The ratio of the movement of the differential feed dog to the movement of the main feed dog. 3.2
Reverse differential stretching feed The amount of movement of the differential feed dog is less than the amount of movement of the main feed dog, and the sewing material stretches during the sewing process. 3.3
Forward differential gathering feed The amount of movement of the differential feed dog is greater than the amount of movement of the main feed dog, and the sewing material shrinks during the sewing process. 3.4
OB/T1515-2005
No-load running
The sewing machine operates without thread, without sewing material, with maximum stitch length, maximum transverse stitch length, zero differential ratio, and presser foot lifted or removed.
4 Classification
4.1 Type
The machine head is a platform or cantilever body, with needle bar thread picking, curved needle thread hooking, differential bottom feeding, and an automatic cutting device and automatic lubrication system.
4.2 Classification
According to GB/T4515-1984, product stitch types can be divided into: 502, 503, 504, 505, 512, 514 stitches and 401+504, 401+514 composite stitches, etc.
4.3 Basic parameters
a) Maximum sewing speed: not less than 5000 stitches/min; b) Stitch length: minimum stitch length is not more than 0.6mm, maximum stitch length is not less than 3.6mm; c) Differential ratio: the maximum differential ratio of forward differential is not less than 1.4, the minimum differential ratio of reverse differential is not more than 0.8; d) Hemming width: not less than 2.5mm;
e) Lifting height of leg: not less than 5mm; f) Needle used: GN type Nm65~Nm130; g) Thread used: 9.5tex×3 (60 counts/3 strands) cotton sewing thread (according to GB/T6835-1997) or 7.4tex×3 (60 counts/3 strands) polyester sewing thread (according to GB/T6836-1997); h) Motor power: not less than 370W.
4.4 Product model representation method
Named in accordance with the provisions of QB/T22511996; it can also be compiled according to the compilation details registered by the enterprise at the National Sewing Machine Standardization Center. 5 Requirements
5.1 Appearance quality
5.1.1 The surface quality of painted parts shall comply with the provisions of 5.1 in QB/T2528-2001. 5.1.2 There shall be no rust or stains on the surface of the machine head, and the label shall be complete, correctly positioned, and free of obvious scars. 5.1.3 There shall be no burrs on the exposed parts and screw heads of the machine head. 5.1.4 The surface quality of the coating of electroplated parts shall comply with the provisions of 6.1.1 in QB/T15721992. 5.1.5 The surface quality of blackened parts shall comply with the provisions of 3.1 in QB/T2505-2000. 5.2 Machine performance
The stitch length, hemming width, differential ratio, thread tension, thread feed and presser foot pressure should all be adjustable. 5.2.1
The cutter should be sharp and the cutting edge should be neat.
The stitch length should comply with the provisions of 4.3b) of this standard. 5.2.34
The differential ratio should comply with the provisions of 4.3c) of this standard. 5.2.5 The hemming width should comply with the provisions of 4.3d) of this standard. 5.2.6 The presser foot lifting height should comply with the provisions of 4.3e) of this standard. 5.3 Sewing performance
There should be no thread breakage, needle breakage, skipped stitches or floating thread in ordinary sewing. 5.3.1
There should be no thread breakage, needle breakage, skipped stitches or floating thread in sewing of thin materials. 5.3.3
There should be no thread breakage, needle breakage, skipped stitches or floating thread when sewing medium and thick materials. 5.3.4 There should be no thread breakage, needle breakage, skipped stitches or floating thread when sewing layer seams. 2
5.3.5 There should be no thread breakage, needle breakage, skipped stitches or floating thread when sewing continuous seams. 5.3.6 The thread should be smoothly discharged when sewing braids, and the length of the braids should not be shorter than 50mm. 5.4 Running performance
5.4.1 Running noise
a) There should be no abnormal noise when running at the highest sewing speed without load; b) The noise sound pressure level should not be greater than that specified in Table 1. Table 1
5.4.2 Vibration displacement
Maximum sewing speed/(needle/minute)
≤5500
>5500～6500
The vibration displacement value should not be greater than 300μum.
5.4.3 Starting torque
The starting torque should not be greater than 0.4Nm.
5.4.4 Lubrication and sealing
The oil supply and return of the lubrication system should be good during operation, and the sealing of the machine head should be good without oil leakage. 5.4.5 Normal operation
The machine should operate normally, and there should be no machine parts jamming or parts falling off. 5.5 Accessories and spare parts
The accessories and spare parts equipped with each machine head should comply with the product manual or packing list. 6 Test method
6.1 Appearance quality
Under the light intensity of (600±200)1x, the inspection distance is 500mm, and the visual judgment is made. 6.2 Machine performance
QB/T 1515-2005
Noise sound pressure level/dB(A)
6.2.1 Adjustment mechanism
The adjustment of stitch length, hemming width, differential ratio, thread tension, thread output and presser foot pressure shall be made in the "sewing performance test" according to the product manual. 6.2.2 Edge cutting performance
The sharpness of the cutter and the neatness of the cut edges shall be checked in the ordinary sewing test. 6.2.3 Stitch length
Sew according to the test conditions specified in Table 2. When measuring the maximum stitch length, use a vernier caliper with an accuracy of not less than 0.02mm to measure the lengths of the shortest 10 continuous stitches on the seam, and take the arithmetic mean as the maximum stitch length; when measuring the minimum stitch length, use a vernier caliper with an accuracy of not less than 0.02mm to measure the lengths of the largest 10 continuous stitches on the seam, and take the arithmetic mean as the minimum stitch length.
6.2.4 Differential ratio
Open the sewing table, remove the needle plate, adjust the feed distance of the feed dog to 2.5mm (the error is not more than 0.10mm), use a dial indicator to measure the stroke of the main feed dog, then adjust the differential wrench to the maximum position of the forward differential, use a dial indicator to measure the stroke of the differential feed dog, and the stroke of the differential feed dog divided by the stroke of the main feed dog is the maximum differential ratio of the forward differential; adjust the differential wrench to the maximum position of the reverse differential, use a dial indicator to measure the stroke of the differential feed dog, and the stroke of the differential feed dog divided by the stroke of the main feed dog is the minimum differential ratio of the reverse differential. 3
QB/T1515-2005
6.2.5 Hemming width
Test in ordinary sewing items and measure with a vernier caliper with an accuracy indication of not less than 0.02mm. 6.2.6 Presser foot lifting height
Turn the hand wheel to adjust the feed dog to a position lower than the needle plate, lift the presser foot with your knee, and use a special presser foot height gauge or a 5mm thick standard gauge block to insert under the foot. It should be able to pass smoothly.
Test items
Fengtong sewing
Sewing of thin materials
Sewing of medium and thick materials
Layer sewing
Continuous sewing
Pigtail sewing
Stitch length
6.3 Sewing performance
6.3.1 Preparation before test
Polyester rag
Sanitary fleece
Polyester cotton cloth
Polyester cotton cloth
Size/
(mmxmm)
1100×100
1100×100
600x100
2100×100
1100×100|| tt||2-6-2-6-2-
Most human
Not short 50
Sewing speed
／(needle/min)
Highest sewing speed
Highest sewing speed
Highest sewing speed
a) Before the test, clean the surface of the machine head, remove the dirt on the needle plate, feed dog, bend needle and thread passing part, add lubricant, run at 80% of the slope height sewing speed for 5 minutes, and then check each item according to the test conditions specified in Table 2: b) The sewing speed is tested with a non-touch speed meter, and the test sewing speed tolerance is -1%: c) Before each test, it is allowed to adjust the stitch length, hemming width, differential ratio, sewing thread tension, thread output and presser foot pressure and conduct trial sewing, but it is not allowed to adjust again during the formal test. 6.3.2 Ordinary sewing
Sewing 1000mm, test and judge.
6.3.3 Sewing of thin materials
Sewing 1000mm, H measurement judgment.
6.3.4 Sewing of medium and thick materials
Sewing 1000mm, H measurement judgment.
6.3.5 Sewing of layers
Sew the materials as shown in Figure 1, sew 3 rows, and make a gate measurement judgment. 6.3.6 Continuous sewing
Stagger and overlap the test materials: the lower layer is overlapped front and back, and the ends are connected and sewn (circumference 2000mm), and sew continuously for 5000mm according to the provisions of Table 2, and make a H measurement judgment.
6.3.7 Sewing of thread braids
Sew according to the provisions of Table 2, and measure the length of the thread braids with a ruler. 6.4 Operation performance
6.4.1 Operation noise
a) When operating at the highest seam speed and narrow load, there should be no abnormal noise, which can be judged by listening; b) The noise level i shall be tested in accordance with the provisions of QB/T1177-1991. 6.4.2 Vibration displacement
Test according to the provisions of QB/T1178-1991. 6.4.3 Starting torque
Test according to the provisions of QB/T2252-1996. 6.4.4 Lubrication and sealing
Test according to the provisions of QB/T2610-2003. 6.4.5 Normal operation
Inspect in the lubrication and sealing test items, listen and visually. 6.5. Accessories and spare parts
Count and check item by item according to the product manual or packing list, and the number shall not be less than the specified number. Inspection rules
7.1 Factory conditions
Products must be inspected and qualified by the quality inspection department and accompanied by an inspection certificate before they can leave the factory. 7.2 Inspection categories
Product inspection is divided into factory inspection and type inspection. 7.2.1 Factory inspection
When the product is delivered, the consignee has the right to conduct acceptance according to the inspection items specified in this standard. 7.2.2 Type inspection
In the following cases, a comprehensive assessment of the product is required and a type inspection should be carried out. 2. After formal production, if there are major changes in structure, materials, and processes that may affect product performance; when normal production is resumed after a long period of suspension; when the inspection results are significantly different from the last type inspection; when the superior quality supervision agency proposes a requirement for type inspection. 7.2.3 Non-conforming classification and inspection classification
Non-conforming classification and inspection classification are shown in Table 3.
QB/T1515-2005
Unit is mm
QB/T 1515 -2005
Inspection Items
Surface Quality of Painted Parts
Surface Quality of Machine Head
Appearance Quality
Machine Performance
Sewing Performance
Operation Performance
5Accessories and Spare Parts
Surface Quality of Exposed Parts
Surface Quality of Electroplated Parts
Surface Quality of Blackened Parts
Mechanism Adjustment
Sharp Cutter and Neat Cutting Edge
Stitch Length
Differential Ratio
Hemming Width
Presser Foot Lifting Height
Ordinary Sewing
Sewing of thin materials
Sewing of medium and thick materials
Sewing of layer seams
Continuous sewing
Thread identification sewing
Abnormal noise
Noise sound pressure level
Vibration displacement
Starting torque
Lubrication and sealing
Normal operation
7.3 Factory inspection rules
7.3.1 Sample extraction
Test method
Classification of non-conformance
Products are delivered in batches, and the unit product is each machine head. Samples should be randomly selected from the batch submitted for inspection. 7.3.2 Sampling plan and strictness
Inspection classification
The normal inspection single sampling plan is shown in Table 4. The inspection strictness shall be determined in accordance with the provisions of Chapter 9 of GB/T2828.1-2003. 7.3.3 Determination of acceptability
According to the results of the sample inspection, if the number of Class A nonconforming products and the number of Class B and C nonconforming products found in the sample are not greater than 6
the corresponding acceptance number (Ac) of QB/T1515-2005, the inspection lot is judged to be acceptable. If the number of Class A nonconforming products and the number of Class B and C nonconforming products found in the sample is not less than the corresponding rejection number (Re), the inspection lot is judged to be unacceptable. 7.3.4 Disposal of unacceptable batches
The disposal of unacceptable batches shall be carried out in accordance with the provisions of 7.2 of GB/T2828.1-2003. Table 4
Inspection level
Sampling plan
Non-conformity category
Sample unit Inspection items
Acceptance quality limit (AQL)
26~150
151~1200
Note 1: The sample unit is each sewing machine head. Sample quantity
Note 2: Ac and Re of category A are counted as non-conforming products, and Ac and Re of categories B and C are counted as non-conforming numbers. Note 3: The use of arrows in the table shall be in accordance with 10.3 of GB/T2828.1-2003. 7.4 Type inspection rules
wwW.bzxz.Net7.4.1 Sample extraction
Normal inspection single sampling
The sample should be extracted from a batch or batches manufactured in this cycle and passed the inspection, and it should be ensured that the obtained sample can represent the manufacturing technology level of this cycle.
7.4.2 Sampling plan
The sampling plan for type inspection is shown in Table 5. Table 5
Discrimination level
Sampling plan
Non-conformity classification
Sample unit inspection item
Non-conformity quality level (RQL)
Sample size
Note 1: The sampling unit is each sewing machine head. Ac
Note 2: Ac and Re of Class A are counted as non-conformities, and Ac and Re of Class B and C are counted as the number of non-conformities. 7.4.3 Judgment of pass or fail in type inspection Single sampling
According to the results of sample inspection, if the number of non-conformities of Class A and the number of non-conformities of Class B and C found in the sample are not greater than the corresponding qualified judgment number (Ac), then the type inspection is judged to be qualified. If the number of unqualified products of Class A and the number of unqualified products of Class B and Class C7 found in the sample is not less than the corresponding unqualified judgment number (Re), the type inspection is judged to be unqualified. Disposal after type inspection
Disposal after type inspection shall be carried out in accordance with the provisions of 5.12 of GB/T2829-2002. 8 Marking, packaging, transportation and storage
8.1 Marking
The following markings shall be on the head
a) Product model;
b) Trademark;
c) Manufacturer's name;
d) Manufacturing date or number.
Product standard number marking
The standard number to be implemented shall be indicated on the product packaging. 8.1.3 Storage and transportation marks on outer packaging
According to the provisions of GB/T191-2000, the following storage and transportation marks shall be present: a) moisture-proof;
b) upward;
c) handle with care;
d) stacking layer limit.
8.2 Product instruction manual
Product instruction manual shall comply with the provisions of GB9969.1-1998. 8.3 Packaging, transportation, purchase and storage
According to the provisions of GB/T16469-1996.
People's Republic of China
Light Industry Standard 1
Industrial Sewing Machine
High-speed Overlock Sewing Machine Head
QB/T1515-2005
Published and distributed by China Light Industry Shanhai Press
Address: No. 6 East Chang'an Street, Beijing
Postal Code: 100740
Issuing Tel: (010)65241695
Website: http://www.chlip.com.cn
Email:
[email protected]Light Industry Standardization Editorial and Publishing Committee Editorial Address: No. 12 Guanghua Road, Chaoyang District, Beijing
Postal Code: 100020
Tel: (010)65811585
All rights reserved
Infringements will be prosecuted
Book Number: 155019.28553 Packaging, transportation, purchase and storage
According to the provisions of GB/T16469-1996.
People's Republic of China
Light Industry Standard 1
Industrial Sewing Machine
High-speed Overlock Sewing Machine Head
QB/T1515-2005
Published and distributed by China Light Industry Shanhai Press
Address: No. 6, East Chang'an Street, Beijing
Postal Code: 100740
Issuing Tel: (010)65241695
Website: http://www.chlip.com.cn
Email:
[email protected]Light Industry Standardization Editorial and Publishing Committee Editorial Address: No. 12 Guanghua Road, Chaoyang District, Beijing
Postal Code: 100020
Tel: (010)65811585
All rights reserved
Infringements will be prosecuted
Book Number: 155019.28553 Packaging, transportation, purchase and storage
According to the provisions of GB/T16469-1996.
People's Republic of China
Light Industry Standard 1
Industrial Sewing Machine
High-speed Overlock Sewing Machine Head
QB/T1515-2005
Published and distributed by China Light Industry Shanhai Press
Address: No. 6, East Chang'an Street, Beijing
Postal Code: 100740
Issuing Tel: (010)65241695
Website: http://www.chlip.com.cn
Email:
[email protected]Light Industry Standardization Editorial and Publishing Committee Editorial Address: No. 12 Guanghua Road, Chaoyang District, Beijing
Postal Code: 100020
Tel: (010)65811585
All rights reserved
Infringements will be prosecuted
Book Number: 155019.2855
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