Workpiece holding-down device for a sewing machine
AssigneeTokyo Juki Industrial Co., Ltd.
InventorsTorao Ohchi, Hideo Yasui
Life of this patent
Estimating the term…
Abstract
A workpiece holding-down device for a sewing machine comprises a spring-loaded presser bar and foot assembly supported in the framework of said sewing machine, a drive mechanism for moving said assembly vertically, and a control circuit for controlling the movement of said presser bar. The foot assembly includes signal means for positioning the presser bar and foot assembly in a controlled position in response to the actuation of an operation member or stored information.
Claims4
A workpiece holding-down device for a sewing machine comprising a vertically movable workpiece holding-down means including a vertical presser bar and a substantially horizontal presser foot pivoted to the lower end of said pressure bar;
- a drive mechanism for moving the presser foot;
- and a control mechanism for controlling said drive mechanism so as to position the presser foot in a controlled position;
- said drive mechanism comprises a motor, means operatively connected to said motor to convert the rotation of the motor into a linear movement and a linkage operatively connected to said conversion means to transmit said linear movement to said presser bar.
A workpiece holding-down device for a sewing machine comprising:
- a vertical presser bar supported in the machine framework of said sewing machine for vertical movement and having a presser foot pivoted to the lower end of said presser bar;
- p1 a holding-down spring disposed about said presser bar for normally urging the presser foot downwardly;
- signal means for producing a push-up signal in response to the operation of an operator's operation member or a program information stored in memory means;
- a drive mechanism operable in response to said push-up signal;
- a vertically movable tubular member interlocked with said drive mechanism for movement between two predetermined positions;
- interlocking means disposed between said tubular member and presser bar for moving said workpiece holding-down means in response to the movement of the tubular member;
- and
- a resilient member disposed about said tubular member between the tubular member and said machine framework to normally urge the tubular member upwardly against the force of said holding-down spring.
Dependencies are inferred from the claim text.