Speed setting device for a sewing machine.

摘要

Disclosed is a speed setting device for an industrial sewing machine. The device comprises a lever (5) pivotally mounted at one end thereof on a stationary wall (3) and adapted to be pivotally moved in response to the foot pedal of the sewing machine. An arm (13) is pivotally mounted at one end to the stationary wall an operatively engaged with the lever so that they rotate in unison about their respective pivot points. The pivot point (21) of the second member is located intermediate the pivot point (11) of the lever and the point (12) of engagement between the lever and the arm. With this arrangement, the arm (13) is rotated through an angle greater than the angle through which the lever is rotated in response to the angular displacement of the foot pedal. An angular displacement sensor (14, 15) detects the angular displacement of the arm to generate a speed setting signal.