John M Washburn

US Patent:

39410684, Mar 2, 1976

Filed:

Dec 12, 1974

Appl. No.:

5/532147

Inventors:

John M. Washburn - West Hartford CT

Assignee:

The Merrow Machine Company - Hartford CT

International Classification:

D05B 5706

US Classification:

112162

Abstract:

A thread control mechanism for an overedge sewing machine uses only the movable driven components of the needle, lower looper, and upper looper, in combination with stationary thread guides, for feeding and controlling the threads used by the machine to form a seam. The lower and upper looper threads, i. e. , the threads which pass through the eye of the lower and upper loopers, respectively, are each engaged by movable thread guides carried on the looper carriers for both loopers so that the coordinated movement of the two loopers cooperate to control and feed both looper threads. A needle thread takeup cam mounted on and driven by the needle arm drive shaft cooperates with stationary thread guides to feed and control the needle thread.