Thread cutter, for button hole sewing machine

摘要

Thread cutter for a button hole sewing machine has a gripper unit (70) with a drive (29) for the upper thread cutter (42) and a drive (30) for the lower thread (60) cutter (53), which operate independently of each other. A power distributor (69) at the gripper (70) delivers the energy for the cutter drives (29, 30). Thread cutter for a button hole sewing machine has a gripper unit (70) with a drive (29) for the upper thread cutter (42) and a drive (30) for the lower thread (60) cutter (53), which operate independently of each other. A power distributor (69) at the gripper (70) delivers the energy for the cutter drives (29, 30). The power distributor (69) is connected by at least one channel (33-35) to an external static energy supply. At least one energy supply channel (33-35) passes through the hollow shaft (19) rotating round the gripper axis (22). At least one drive has a pneumatic cylinder (29, 30) as a double action pneumatic cylinder, or one drive has a double action cylinder and the other drive has a single action pneumatic cylinder. The pneumatic cylinders (29, 30) are positioned at the gripper (70) so that their axes are parallel to the gripper axis (22). A flange (27) extends radially round the axis (22), as a mounting for the pneumatic cylinders. The channels (33-35) are elastic hoses. The power distributor (69) has a rotating unit to carry the compressed air from the static supply point to the drives (29, 30).