G - Physics – 05 – B
Patent
G - Physics
05
B
342/22
G05B 19/12 (2006.01) D05B 21/00 (2006.01) G05B 19/40 (2006.01) D05B 65/00 (2006.01)
Patent
CA 1042532
ABSTRACT The disclosed invention describes an automatic sewing machine which uses a randomly addressable storage element to store a sequence of instructions. The instructions describe a pattern through which a work holder securing a work piece is moved. Electrical circuitry reads the instructions stored in the storage element in a predetermined sequence and provides electrical signals dependent upon the sequence of instructions. A pair of stepping motors respond to the electrical signals to move the work holder. The electrical signals to the stepping motors are aperiodic in order to increase the machine cycle rate and to reduce the tendency of the stepping motors to oscillate. A closed loop actuatable homing device moves the work holder to a predetermined "home" position prior to reading any of the sequence of instructions. Thereafter the work holder is moved according to the sequence of instructions in an open loop made. Limit circuitry prevents the work holder form being moved beyond predetermined limits. At the end of each sequence of instructions the homing device returns the work holder to its predetermined "home" position.
232209
Cullen Robert E.
Herzer William P.
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