Patent ID: 7571689

Claim:
A clutch structure for a presser foot in an embroidery sewing machine, in which, as an upper shaft rotates, a presser foot drive cam rotates, with the result that a presser foot drive lever having a presser foot drive link pivots around a certain pivot point, which is moved vertically by a height adjusting mechanism for the presser foot, a presser foot drive block connected to the presser foot drive link vertically reciprocates on a needle bar guide shaft, and a presser foot moves vertically in cooperation with vertical movement of a presser foot holder fastened to the presser foot drive block, the clutch structure comprising: a guide member, to which the presser foot drive link is rotatably connected, and through which the needle bar guide shaft passes; a spring connecting member mounted on the outer circumference of the needle bar guide shaft and inside the guide member; a resilient member mounted on an outer periphery of the spring connecting member; and a pivot member mounted inside the guide member so as to be pivotable around the needle bar guide shaft within a certain angular range by the height adjusting mechanism and the resilient member.