Two-way operation system control device for sewing machines
AssigneeJanome Sewing Machine Co., Ltd.
InventorYoshikazu Tanaka
Life of this patent
Estimating the term…
Abstract
A speed control device for a sewing machine having a drive motor, includes a foot controller with a variable resister and a depressable operating plate; depending upon the extent to which the plate is depressed the variable resister provides a variable resistance value for the motor. The controller also has manually operable push buttons each sewing to selectively connect one of several different fixed-value resistors in circuit with the drive motor. A changeover switch connects the variable resistor into the motor circuit when the plate is depressed and disconnects the variable resister from the circuit while connecting the fixed resistors into the circuit, when the plate is not depressed.
Claims4
A speed control device for a sewing machine comprising a machine drive motor;
- and a foot controller including a variable resistor providing a variable resistance value to drive the machine drive motor in dependence upon the operation of the foot controller, said foot controller being provided with a plurality of hand-operated means, fixed resistors each specific to and in operative connection with one of said hand-operated means, and a changeover switch, said changeover switch being displaced to a first position for connecting the variable resistor to the machine drive motor when the foot controller is operated and being displaced to a second position for connecting the fixed resistors in circuit with the machine drive motor when the foot controller is released, said hand-operated means being selectively operable to selectively connect respective ones of the fixed resistors to the machine drive motor.
Dependencies are inferred from the claim text.