Pneumatic thread undercutter

Details Pneumatic thread undercutter Pneumatic thread undercutter

1981-08-04

1983-08-30

Schroeder, Werner H.

Sewing

Elements

Thread cutting, severing or breaking

D05B 6502

Patent

active

044010460

ABSTRACT:
A pneumatic thread undercutter to sever both the needle thread and the bobbin thread in a lock stitch type sewing machine. The apparatus works in conjunction with a pneumatically controlled sewing machine, and includes a frame disposed beneath a sewing area surface, a pneumatic cylinder carried on the frame having an extensible rod upon which a moving blade is operatively connected so as to translate in a reciprocal lateral manner. The moving blade includes a cutting notch, a pull hook and anvil hook orifice cooperating with a ramp area on a bobbin case to engage both the bobbin thread and needle thread such that one thread is cut before the other. A stationary knife is included to cut the second of the two threads so that at the end of a predetermined sewing endeavor the thread attached to a work piece can be expeditiously cut and a second work piece can be engaged in a rapid manner.

REFERENCES:
patent: 1450531 (1923-04-01), Weis
patent: 1878480 (1932-09-01), Fifield
patent: 3051111 (1962-08-01), Cortese et al.
patent: 3403648 (1968-10-01), Jarrett
patent: 3418953 (1968-12-01), Fowler
patent: 3859940 (1975-01-01), Nakamura
patent: 4200050 (1980-04-01), Bianchi
patent: 4202286 (1980-05-01), Costas

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