Patent ID: 6973887

Claim:
A chain stitch sewing mechanism with a sewing head movable parallel to a sewn material plane, which sewing head includes a needle rod for a thread carrying needle, a needle drive for linearly moving the needle rod back and forth at an angle to the sewn material plane, a needle shaped thread catcher provided with an open catching hook and a catcher drive for linearly moving the thread catcher back and forth at an angle to the sewn material plane, with the movement path of the needle and of the thread catcher forming a sharp angle α with one another whose apex S lies below the sewn material plane and with the needle drive and the catcher drive being so controlled that a thread loop formed by the withdrawal of the needle out of the sewn material and located below the sewn material is caught by the thread catcher and pulled by the thread catcher upwardly through the sewn material, wherein a driven thread puller is associated with the thread catcher, which thread puller has an arm movable at an angle to the movement path of the thread catcher into the path of the thread loop hanging on the thread catcher and whose drive is so controlled that the arm near the uppermost position of the thread catcher deflects the thread loop hanging from the thread catcher at an angle to the movement path of the thread catcher and toward the side opposite to that of the hook opening.