Needle thread tension control system with differential clamping

Details Needle thread tension control system with differential clamping Needle thread tension control system with differential clamping

1988-04-26

1989-09-26

Falik, Andrew M.

Sewing

Elements

Tensioning

112241, D05B 4704, D05B 4900

Patent

active

048691860

ABSTRACT:
A needle thread tension control system includes a pair of thread clamping members and a driving mechanism for driving the thread clamping members in timed relation with the rotating speed of a arm shaft. A controlling mechanism controls the driving mechanism to effect a disengaging displacement of the thread clamping members to be smaller than an amount of engaging displacement therof for a predetermined angle of rotation of the arm shaft. The controlling mechanism includes a specific cam drive linkage in the driving mechanism to effect the differential displacements of the clamping members.

REFERENCES:
patent: 4215641 (1980-08-01), Dobrjansky et al.
patent: 4632048 (1986-12-01), Matsubara
patent: 4690083 (1987-09-01), Hara et al.
patent: 4791876 (1988-12-01), Sasaki et al.

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