QB/T 3709-1999 Thread take-up cam for household sewing machines

This standard applies to the thread take-up cam of JA type sewing machines. QB/T 3709-1999 Thread take-up cam for household sewing machines QB/T3709-1999 Standard download decompression password: www.bzxz.net

Classification number: Y17
Light Industry Standard of the People's Republic of China
QB/T3709-1999
Household sewing machine
Published on April 21, 1999
Thread take-up cam
Implemented on April 21, 1999
Published by the State Bureau of Light Industry
QB/T3709-1999
This standard is the original national standard GB4526-1984 "Thread take-up cam for household sewing machines", which was converted to QB/T3709-1999 through the publication of the State Light Industry Bureau [1999] No. 112, and the content remains unchanged. This standard was 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. This standard was drafted by the Shanghai Sewing Machine Research Institute. The main drafters of this standard are Yang Fuyuan and Zhu Yiming. Light Industry Standard of the People's Republic of China
Thread take-up cams for household sewing machinesbZxz.net
Thread take-up cams for household sewing machines This standard applies to the thread take-up cams of JA type sewing machines. Type and size
Type and size, as shown in the figure below.
SM15/64
75°±30
2 Technical requirements
QB/T3709-1999
R15.6±D.042
2.1 There should be no sand holes on both sides of the 7.94 groove and the end face of 20.8. 2.2 When installed on a special measuring tool, the 7.94 groove should rotate flexibly after matching with the thread take-up roller, and there should be no jamming. 2.3 The coordinate size of the curved groove should meet the requirements of the movement trajectory of the thread take-up rod. Approved by the State Bureau of Light Industry on April 21, 1999
Implemented on April 21, 1999
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