Patent ID: 6237515
Filing Date: 2001-05-29
Classification: D05B

Abstract:
A buttonhole sewing machine for the production of buttonholes on a workpiece (32) of fabric, comprisinga needle (12) mounted in an arm (4),which needle (12) is reciprocatingly drivable in a Z direction by a driving motor (6), forming a series of stitches,which needle (12) is drivable by a jogging drive (23) for the production of a zigzag seam by a motion of the needle (12) relative to the workpiece (32), andwhich needle (12) is drivable to pivot about an axis by means of a pivot drive (18);a hook bearing (13),which is disposed in a base plate (2), andwhich is drivable by a pivot drive (18) to pivot synchronously and equiangularly relative to the needle (12) about a pivot axis (17) which extends in the Z direction; anda thread feeding mechanism (33) in the path of a needle thread (34) which is fed in a direction of delivery (48);wherein the thread feeding mechanism (33) comprises a pivotal thread lever (41) with an opening (42) for the needle thread (34) to be led through; andwherein the thread lever (41) is drivable by a triggerable positioning motor (45) to pivot between a zero position (68) and several positions of thread delivery (69, 70, 72).