Sewing machine cutting system having microprocessor controlled c

Details Sewing machine cutting system having microprocessor controlled c Sewing machine cutting system having microprocessor controlled c

1997-09-08

1999-10-19

Nerbun, Peter

Sewing

Special machines

Pattern controlled or programmed

112300, 112DIG3, D05B 1912, D05B 6502

Patent

active

059670690

ABSTRACT:
A cutting system for a sewing machine is disclosed. The cutting system may include a pattern cam that does not have a stopping lug or a stopping groove. The pattern cam may have two faces having substantially equal circumferences. The cutting system may comprise a pneumatically actuated, computer-controlled means for activating and positioning the moveable cutting blade which cuts both the upper needle and lower bobbin threads of a sewing machine. The pattern cam may have a stopping signal device to achieve existing timings of the sewing machine's hook and to determine the home position of the pattern's first stitch. Microprocessor-based signals may be used to count programmed stitches and pulses while reading the signals from the cam to send signals to control a manifold which opens solenoids in a series of synchronized controlled air flow forces to activate and position the moveable cutting blade which cuts both the upper needle and lower bobbin threads of sewing machine.

REFERENCES:
patent: 3543737 (1970-12-01), Maschmann
patent: 3738297 (1973-06-01), Sangiorgi
patent: 4235179 (1980-11-01), Ross
patent: 4417531 (1983-11-01), Doyama
patent: 4459925 (1984-07-01), Miyachi et al.
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patent: 5372079 (1994-12-01), Kitai et al.
patent: 5603272 (1997-02-01), Takahashi et al.
Brother Sewing Machine Parts Book, "High Speed Lock Stitch Pattern Tacking Machine with Treble Hook", Jan. 1983.
Brother Sewing Machine Parts Book, "High Speed Bar Tacking Machine", Dec. 1989.

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