Thread guiding device for schiffli embroidery machine

摘要

A thread guiding appts. for a schiffle embroidery machine has a small (14) and a large (15) guide for the front thread (11) running from the reel to the needle (16). There is a first regulating member (29) which contributes to the movement of the large guide and a second regulating member (31) by which the thread tension can be adjusted. The small guide is stationary and means (18) are supplied for superimposing the second member's movement profile on that of the first and to transmit the combined movement to the large guide. Also claimed is a similar thread guiding appts. where the first regulating member is a signal generator to produce a signal analogous to a first movement profile and the second is a generator for a second profile. A phase detector controls the generators in accordance with the angular position of the drive shaft and their outputs are connected to a summing circuit, its output being connected to the controller for the motor drive to large thread guide.