| 摘要 |
A mechanism for controlling the direction and amplitude of a cloth feeder in a sewing machine comprises a cam keyed on a spindle having a control button, said cam acting on an actuating arm of a control shaft of which the angular position determines the direction and amplitude of the feeder. By turning the control button, the cam angularly sets the actuating arm and hence the stitch length. When the button is turned to a given angular position, a cam profile thereon axially displaces a sliding rod to push a sliding pinion and bring a cam profile of the pinion into contact with an eccentric protuberance of the cam. The pinion is driven by the main shaft of the machine so that in said given position of the button it axially reciprocates the cam and hence automatically modulates the direction and amplitude of the cloth feeder to execute a special stitch. |
