Sewing – Elements – Thread cutting – severing or breaking
Patent
1982-02-22
1984-03-20
Rimrodt, Louis
Sewing
Elements
Thread cutting, severing or breaking
D05B 6502
Patent
active
044374232
ABSTRACT:
A thread trimming device comprises a first ratchet disposed on a first shaft having a first partial gear, a first cam surface, a first radial projection, and blank surfaces on its periphery. A second ratchet disposed on a second shaft has a second partial gear, a second radial projection, and a second cam surface on its periphery. A stationary blade is secured to a framework. A pivotably movable blade is connected to the second shaft. A solenoid moves the second ratchet along the second shaft such that, upon actuation of the solenoid, the toothed portion of the first and second partial gears are engaged with each other to rotate the movable blade to an operable position relative to the stationary blade. Thereafter the first cam surface comes into contact with the second partial gear to slowly rotate the movable blade to cooperate with the stationary blade to perform the thread trimming operation. Afterwards, the first radial projection comes into sliding contact with the second radial projection and the second cam surface to rotate the second ratchet in the reverse direction after the termination of the thread trimming operation.
REFERENCES:
patent: 3141432 (1964-07-01), Reeber et al.
patent: 3889615 (1975-06-01), Uozake et al.
patent: 3921554 (1975-11-01), Uozaki et al.
Aisin Seiki Kabushiki Kaisha
Falik Andrew M.
Rimrodt Louis
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