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Class Information
Number: 112/229
Name: Sewing > Elements > Revolving hooks > Bobbin tensioning
Description: Includes tension means for the bobbin.

Patents under this class:

Patent Number Title Of Patent Date Issued
8640637 Sewing-machine bobbin thread tension controller, and sewing machine Feb. 4, 2014
6901871 Bobbin case assembly with thread tensioning element and method of drawing thread from a thread supply Jun. 7, 2005
6895879 Bobbin case assembly with thread tensioning assembly May. 24, 2005
6152057 Bobbin assembly incorporating a thread tensioning assembly and method of controlling the payout of thread from a bobbin assembly Nov. 28, 2000
5109782 Cover plate and bobbin holder thread tensioning guides May. 5, 1992
5065683 Thread trimmer mechanism for sewing machines Nov. 19, 1991
5048436 Rotary looper for a lockstitch sewing machine Sep. 17, 1991
4920903 Device for adjusting a lower thread in a sewing machine May. 1, 1990
4886004 Needle thread tension control including separate stopping and adjustable pre-tension devices Dec. 12, 1989
4884519 Bobbin case holder with adjustable thread tensioning device Dec. 5, 1989
4748925 Opening plate for attaching a lower thread bobbin of a sewing machine Jun. 7, 1988
4704975 Upper and lower thread tension devices for sewing machine Nov. 10, 1987
4700644 Sewing machine having an automatic lower thread tension device Oct. 20, 1987
4679513 Thread-tensioning device for a bobbin housing Jul. 14, 1987
4638751 Sewing machine with a device for setting thread tension Jan. 27, 1987
4572091 Freely revolving looper for double lockstitch sewing machines Feb. 25, 1986
4542706 Lower thread tension adjusting device of sewing machine Sep. 24, 1985
4530296 Lower thread tension adjusting device of sewing machines Jul. 23, 1985
4458613 Sewing machine with bobbin thread tension adjusting device Jul. 10, 1984
4434734 Anti-spill device for sewing machine bobbin Mar. 6, 1984
4429649 Assembly for lower thread tension adjustment of sewing machine Feb. 7, 1984
4377980 Automatic thread tensioning device for sewing machines Mar. 29, 1983
4365567 Modified thread control lever for a bobbin case Dec. 28, 1982
4355590 Variable bobbin thread control for lockstitch looptaker Oct. 26, 1982
4331090 Bobbin thread tensioning device for a sewing machine May. 25, 1982
4299181 Bobbin thread tension device Nov. 10, 1981
4275675 Bobbin case with thread guide for cyclic sewing machine Jun. 30, 1981
4235178 Bobbin thread tension device Nov. 25, 1980
4217839 Adjustable anti-spill bobbin tension spring Aug. 19, 1980
4157691 Spool case for sewing machines Jun. 12, 1979
4137858 Gripper and bobbin assembly for double-lock-stitch sewing machine Feb. 6, 1979
4089282 Bobbin case May. 16, 1978
4074645 Controlled braking device for the gripper-thread bobbin of a double lock-stitch sewing machine Feb. 21, 1978
3940089 Sewing machine thread control Feb. 24, 1976

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