Patent ID: 7194968
Filing Date: 2007-03-27
Classification: D05C

Abstract:
1. An embroidery frame comprising: an upper frame; a lower frame, the upper and lower frame clamping a workpiece cloth between an upper surface of the lower frame and a lower surface of the upper frame; a clamping unit that presses the upper frame against the lower frame; a projection formed on either one of the upper surface of the lower frame and the lower surface of the upper frame; a plurality of notched recesses formed on an outer peripheral surface of the projection; a groove formed on the other of the upper surface of the lower frame and the lower surface of the upper frame to receive the projection; and a plurality of protrusions formed in the groove that conform with the notched recesses, wherein the notched recesses increase a surface area of the projection constituting a part of a cloth clamping surface and the protrusions increase a surface area of the groove constituting a part of the cloth clamping surface.