Device for forming a hem on fabric edges with the use of a sewing machine

Abstract

A hem forming means comprising a guide shoe suspended with limited movability on a spring clip directly in front of the needle hole of the machine. The spring clip, which is arranged at right angles to the conveying direction of the sewing material is attached to a ruler forming an edge abutment surface for the sewing material. In the zone of the edge abutment surface, the guide shoe is provided with a turndown nose which has, on the side facing away from the ruler, a lateral surface extending with broadening of the turndown nose at an acute angle with respect to the needle hole. This lateral surface extends at a spacing parallel to a beveled surface of the base plate, said beveled surface extending toward the needle center. The beveled surface constitutes one limitation of a wedge-shaped edge cutout of the base plate, into which the turndown nose of the guide shoe disposed thereabove can enter under spring pressure. The point of engagement of the spring clip at the guide shoe is, as seen from the ruler, outside of the wide center of the guide shoe, so that the contact pressure of the guide shoe sole is higher on the outside than in the zone of the contact surface of the ruler. In this way a flawless, straight guidance of the edge of the sewing material is obtained, making it possible to maintain an always constant small hem width, even in case of very fine sewing material.