Under thread detection for sewing machines with axially spring b

Details Under thread detection for sewing machines with axially spring b Under thread detection for sewing machines with axially spring b

1979-03-01

1981-02-17

Nerbun, Peter P.

Sewing

Elements

Thread sensing

D05B 5900

Patent

active

042508258

ABSTRACT:
A sewing machine having a rotary hook shaft, a bobbin case with a hollow cylindrical shaft journalled through the rotary hook shaft, and a bobbin rotatably mounted on the shaft of the bobbin case. An axially spring-biased cylindrical member is provided for unitary rotation with the bobbin and axially movable between a first position in which it is held against the lateral edges of the thread layers when the latter is present through the length of the cylinder of the bobbin and a second position in which the thread layers have reduced to a predetermined radial extent. A detector is provided to sense the axial movement of the spring-biased cylinder member from the first to second positions.

REFERENCES:
patent: 2420275 (1947-05-01), Winberg
patent: 3601073 (1971-08-01), Simpson
patent: 3845320 (1974-10-01), Winberg
patent: 3991692 (1976-11-01), Papajewski et al.

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