Sewing – Elements – Thread cutting – severing or breaking
Patent
1984-10-03
1985-12-17
Schroeder, Werner H.
Sewing
Elements
Thread cutting, severing or breaking
112273, 112275, 112300, D05B 5100
Patent
active
045586543
ABSTRACT:
A device for stopping the machine drive of a needle movable in cooperation with a rotary hook of a sewing, embroidering or tufting machine upon a thread breakage comprises a thread cutting mechanism which includes a thread catcher movable through the needle path and a switching mechanism which is connected to the drive for disconnecting it and which becomes effective upon a thread breakage. The device includes a movably mounted thread feeler carrier having a thread feeler which is adapted to be located between the needle and the rotary hook. The drive mechanism for actuating the thread catcher includes control cams which are engageable with lifting cams so as to project the feeler out of the path of motion of the thread between the needle and the rotary hook. The thread feeler is associated with a piezoelectric element and the deflection of the feeler by the thread produces a pulse which regulates the drive mechanism for the sewing machine and effects the stopping thereof when the threads are cut.
REFERENCES:
patent: 3658021 (1972-04-01), Hedegaard et al.
patent: 4284020 (1981-08-01), Conner, Jr. et al.
patent: 4429651 (1984-02-01), Tajima
patent: 4469038 (1984-09-01), Fujikawa
Schiller Karl H.
Schilling Lothar
Falik Andrew M.
Pfaff Industriemaschinen GmbH
Schroeder Werner H.
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