Thread consumption detecting apparatus for a sewing machine

Details Thread consumption detecting apparatus for a sewing machine Thread consumption detecting apparatus for a sewing machine

1997-05-13

1998-12-01

Nerbun, Peter

Sewing

Elements

Thread sensing

200 6118, D05B 6936, H01H 316

Patent

active

058424326

ABSTRACT:
A thread consumption detecting apparatus includes an axial supporting shaft, a detector lever, a torsional spring, a proximity sensor, and a central processing unit (CPU). The detector lever includes an intermediate portion, a loop-shaped thread-contact end, and a base end. The intermediate portion is fitted idly around the supporting shaft so that the detector lever can swing. The thread-contact end is disposed so as to pass a thread outside the loop-shaped portion. The base end is detected by the proximity sensor. A swinging stroke of the detector lever is disposed so as to interfere with a thread-transfer-route variation range resulting from a fluctuation in tension of the thread. The torsional spring urges the detector lever in one swinging direction. The proximity sensor detects the base end on approach when the detector lever is swung by the tension of the thread. The CPU judges whether the thread is consumed or not in accordance with a signal output from the proximity sensor.

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