Importance

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Abstract

At a sewing automat the sewing head is provided with a rotary housing incorporating a needle bar, a needle bar jogging mechanism and a thread take-up mechanism and a rotatable hook bearing receiving a hook, in order to generate a tangentially directed needle feed movement of the needle relative to the seam to be produced. In order to achieve constant lengths of stitches at swivel motions of the rotary housing and the hook bearing a rotary position indicator associated to a central control unit is connected to a main drive shaft, wherein the rotary position indicator puts out a pre-given number of pulses per revolution of a main drive shaft. The main drive shaft and an adjusting shaft are operably connected to the rotary position indicator via a differential gear in such a manner that at swivelling of the adjusting shaft the rotary position indicator generates a number of pulses corresponding to the swivelling of the adjusting shaft.

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First Claim