Sewing – Elements – Thread cutting – severing or breaking
Patent
1980-04-28
1981-03-10
Hunter, H. Hampton
Sewing
Elements
Thread cutting, severing or breaking
112301, D05B 6502
Patent
active
042547253
ABSTRACT:
A thread-cutting device for sewing machines including a housing mounting a reciprocating thread guiding needle which cooperates with a revolving looper comprises a thread catcher adjacent the looper which is movable to engage the thread and to advance the thread past a fixed knife. The catcher is mounted so that it may move relative to the looper and the fixed knife to urge thread held by the catcher into cutting engagement with the knife. Double action fluid pressure operated piston and cylinder is connected to the catcher so as to move it relative to the knife and to the looper. A member is connected to the mechanism between the fluid pressure cylinder operator and the thread catcher and a spring has one end connected to the member and an opposite end mounted on the housing in such a manner that the force of the spring may be adjusted. A fluid pressure operated control has a movable control piston rod which is engageable with the member in an engagement portion thereof such as an opening therethrough. When engaged, it holds the connection between the fluid pressure operated piston rod and the thread catcher against the influence of the spring. When the spring is connected so that it operates through the member moving the catcher, it causes the catcher to be moved during the cutting movement of the thread with some delay so that tearing of the thread is less likely. In a non-operative position, the control member holds the moving mechanism for the thread catcher against the force of the spring.
REFERENCES:
patent: 3141432 (1964-07-01), Reeber et al.
patent: 3173392 (1965-03-01), Hedegaard
patent: 3782313 (1974-01-01), Conti
patent: 4202286 (1980-05-01), Costas
Hager Walter
Walther Karl-Heinz
Hunter H. Hampton
McGlew John J.
Pfaff Industriemaschinen GmbH
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