Sewing machine with automatic thread control and thread breakage

Details Sewing machine with automatic thread control and thread breakage Sewing machine with automatic thread control and thread breakage

1990-05-22

1991-02-19

Nerbun, Peter

Sewing

Elements

Starting or stopping

112302, D05B 6936

Patent

active

049933370

ABSTRACT:
A sewing machine includes a timing pulse generator, a thread feeding device, thread sensor, and microcomputer. The timing pulse generator generates a timing pulse when a main shaft is rotated by a predetermined rotational increment by a main motor. The thread feeding device feeds out a needle thread toward a needle. The thread sensor is disposed in a path of the needle thread between the thread feeding device and the needle, and generates a thread breakage signal when the needle thread is out of the path. The microcomputer drives the thread feeding device based on the timing signal generated by the timing pulse generator if the thread breakage signal is not generated by the thread sensor. The microcomputer counts the timing pulses after the thread breakage signal has been generated by the thread sensor. The microcomputer stops the main motor when a count value has reached first predetermined value. The microcomputer stops the thread feeding device when the count value has reached a second predetermined value which is smaller than the first predetermined value.

REFERENCES:
patent: 4244310 (1981-01-01), Sasaki et al.
patent: 4269131 (1981-05-01), Principe
patent: 4408554 (1983-10-01), Takiguchi et al.
patent: 4638752 (1987-01-01), Hartwig
patent: 4691654 (1987-09-01), Meier
patent: 4735161 (1988-04-01), Brocklehurst
patent: 4766827 (1988-08-01), Matsubara
patent: 4841890 (1989-06-01), Tancs

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