Sewing – Elements – Thread cutting – severing or breaking
Patent
1980-05-15
1982-12-28
Hunter, H. Hampton
Sewing
Elements
Thread cutting, severing or breaking
112295, 112298, D05B 6500
Patent
active
043655688
ABSTRACT:
A single-operation cam mechanism includes a cam body with a cam surface extending along the body from an entrance location to an exit location. A cam follower is retained in a waiting position adjacent a part of the cam body at which the exit location is found. When the cam follower is moved free of the retainer, a spring forces the cam follower to the part of the cam where the entrance location is found. Then, as the cam rotates, the cam surface engages the follower and forces it back through the exit location and past a resilient trap to the waiting position. The trap snaps shut after the follower has been forced past it, and the surface of the trap then prevents the follower from moving back into engagement with the cam surface except by way of the entrance location. In an underbed thread trimmer, a support member for the cam follower engages a pin connected to blade-like members, some of which have hooks, to carry one set of such members to a position in which their hooks engage looptaker thread. Another set of such members is carried by the pin to a different location in which their hook engage a limb of needle thread. The follower is connected to the pin by a support member so that movement of the follower back to its waiting position retracts sets of hooks and draws the threads across separate ledger blades to sever them.
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Bell Edward L.
Hunter H. Hampton
Smith Robert E.
The Singer Company
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