Electric sewing machine with a speed control system
AssigneeJanome Sewing Machine Co., Ltd.
InventorYoshiaki Ozaki
Life of this patent
Estimating the term…
Abstract
A sewing machine composed of a drive motor, an upper shaft with detector, a motor speed control and a motor starting and stopping control. The motor speed control has a bistable device to start and stop the machine in response to signals from a switch and an extreme lower speed control to drive the motor at an extreme low speed in response to a signal from a switch. Motor speed control also has counters which when set and actuated by a switch execute a predetermined finite number of stitches. Motor control device also has circuits allowing the motor to operate in response to a variable speed control switch.
Claims3
A sewing machine with a machine drive motor having an upper drive shaft and a motor speed control system including a variable motor speed control circuit, said motor control system comprising electrically conductive operating means sensing a touch by an operator;
- a switch means operated by manipulation of the electrically conductive operating means to produce a signal;
- motor starting and stopping means including bistable functioning means to start the machine drive motor at a predetermined speed when the bistable functioning means receives the signal from the switch means while the machine drive motor is stopped, said motor starting and stopping means operating to stop the machine drive motor when the bistable functioning means receives the signal from the switch means while the machine drive motor is rotating;
- and extreme lower speed control means operated to drive the machine drive motor at an extreme lower speed when the operating means is touched by the operator while the machine drive motor is driven by the motor starting and stopping means.
Dependencies are inferred from the claim text.