Activation device for a path and time dependent motion of a thread cutting and lead-in stitching unit

摘要

The activation for a path and time related motion of a thread cutting and lead-in stitching unit (7) and the thread brake (25) occurs by a cam drive driven by the primary shaft (9) and a cam drum (75) arranged on the upper shaft (17). This way, an absolute synchronization of the elements of the thread cutting and lead-in stitching unit (7), the thread brake (25), and the hook as well as the needle is ensured.

主权项

1. A sewing and embroidery machine comprising: an activation device for a path and time related motion of a thread cutting and lead-in stitching unit (7) driven by a primary shaft (9) of the sewing and embroidering machine, a coupling sled (55) that guides a movement of the thread cutting and lead-in stitching unit, a thread brake (25) that controls an upper thread tension, a coupling member that is movable dependent upon a trigger signal, said coupling member inserts one of two switching levers (47, 51) into a respective one of a link (41) for cutting a thread or a link (43) for lead-in stitching, dependent upon a rotational angle of an upper shaft of the sewing and embroidery machine, and thus drives the path and time related motion of the thread cutting and lead-in stitching unit (7) and the thread brake (25) in time with the thread cutting and lead-in stitching unit, and the coupling member (59) is engagable with an adjusting ring (61) on the primary shaft (9) by electrifying a magnet (65).