Sewing – Work manipulating – Guides
Patent
1978-06-12
1980-07-01
Nerbun, Peter P.
Sewing
Work manipulating
Guides
D05B 302
Patent
active
042100887
ABSTRACT:
When a pattern is selected a pattern-identifying code word is persistently held, the system referring to this code word during pattern formation. A free-running pulse generator applies pulses to an addressing counter, unsynchronized with machine operation, and at a speed much higher than the speed of machine rotation. As the addressing counter assumes successive counts, successive data appear at the outputs of an addressed ROM. At least some of this memory-output data is continually compared to the pattern-identifying code word, to ascertain whether certain predetermined relationships between the memory-output data and pattern-identifying code word exist; these relationships include identity, but are not limited to simple identity. This ongoing comparison determines how many steps the counter is to be allowed to run through before the next stitch-forming operation is performed. Meanwhile, at least some of the memory-output data is being applied to an adder having feedback, through the intermediary of logic gates. The output signals of the adder constitute potential stitch-control data. As the counter counts, sometimes the output signals produced by the adder are fed back and added to the input signals applied to the adder's input, the potential stitch-control data being generated in this way. When the counter stops counting, the output signals now present on the adder will constitute the stitch-control data for the next stitching operation to be performed.
REFERENCES:
patent: 3855956 (1974-12-01), Wurst
patent: 4085691 (1978-04-01), Coughenour et al.
patent: 4086862 (1978-05-01), Makabe et al.
Makabe Hachiro
Takenoya Hideaki
Janome Sewing Machine Co. Ltd.
Nerbun Peter P.
Striker Michael J.
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