Sewing machine with bobbin thread monitor

Details Sewing machine with bobbin thread monitor Sewing machine with bobbin thread monitor

1991-04-29

1992-04-14

Nerbun, Peter

Sewing

Elements

Thread sensing

11226211, 242 37R, 250560, D05B 4500, D05B 5902

Patent

active

051037505

ABSTRACT:
According to a sewing machine with a bobbin thread monitor, the light emitted from a luminescence element is reflected by a bobbin thread or a rotating hook bobbin and received by a light receiving element. The light receiving element outputs the detection signal according to an amount of thread remaining on the bobbin based on the reflection light. A color sensor detects the wave length of the color of the bobbin thread and outputs the signal according to the result of the detection. A CPU corrects the detection signal output from the light receiving element based on the signal output from the color sensor so that the amount of thread remaining on the bobbin is detected.

REFERENCES:
patent: 4188902 (1980-02-01), Kahan
patent: 4212257 (1980-07-01), Herron et al.
patent: 4250825 (1981-02-01), Kamiyama
patent: 4432297 (1984-02-01), Kemmel
patent: 4569298 (1986-02-01), Lindh et al.
patent: 4693196 (1987-09-01), Hager
patent: 4805544 (1989-02-01), Dobner et al.
patent: 4825789 (1989-05-01), Garron et al.
patent: 4938159 (1990-07-01), Shibata
patent: 5020461 (1991-06-01), Hanyu et al.
patent: 5044292 (1991-09-01), Nakamura et al.

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