Abstract: A sewing machine for sewing workpieces, comprises a stationary bottom part with an arm which has one end pivotally mounted on the bottom part and an opposite end overlying the bottom part. The arm is movable from a fixed sewing position to an inoperable position away from the point of stitch formation. A revolving looper is mounted on the end of the opposite arm and it has a thread exit opening and a needle is mounted for upward and downward movement in the bottom part for cooperation with the looper. The workpiece is clamped between the base part and the arm and the needle traverses the workpiece upwardly. The construction includes a looper thread guide member mounted on the opposite arm adjacent the looper and has a thread deflector located between the needle path and the thread exit opening of the looper and extending above the point of stitch formation directly laterally of the needle path crosswise to the axis of the looper.

Abstract: A sewing machine for sewing buttonholes in a workpiece comprises a stationary lower part and an arm having one end pivotally mounted on the lower part and having an opposite end which carries a rotary hook which cooperates with a reciprocating needle carried in the lower part. The arm is pivotal relative to the base part to move the arm from a fixable sewing position with said hook spaced by a predetermined distance from the needle at a stitch-forming area to a rest position in which it is spaced away from the stitch-forming area. A thread-monitoring device is located adjacent the needle for monitoring the thread and detecting any breakage thereof. The machine includes a buttonhole cutting mechanism which is connected to the drive means so as to periodically cut the workpiece. A clamp is carried by the upper arm and it has a lower portion which rests on a resilient support which is biased upwardly by a spring.