Electronic control system for sewing machines
AssigneeJanome Sewing Machine Co., Ltd.
InventorsKazuo Watanabe, Hachiro Makabe, Toshiaki Kume, Toshihide Kakinuma, Hideaki Takenoya
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Abstract
A first memory stores stitch control signals. A second memory stores these signals temporarily and reads them out to enable stitches to be formed. As a pattern is stitched, the first memory is readdressed and stitch control signals are successively written into and read out of the second memory. In one embodiment, the second memory is a RAM--in a second embodiment, the second memory is a shift register. Monostable multivibrators are used to operate the memories.
Claims11
An electronic control system for use in sewing machines which vary needle position and fabric feed in order to stitch a plurality of stitch patterns in accordance with stitch control signals, comprising:
- a pulse generator issuing pulses in synchronism with rotation of the sewing machine;
- a first memory storing a plurality of stitch control signals;
- a user-operable pattern selector for selecting an initial address within the first memory;
- a plurality of monostable multivibrators which are connected to each other and to the pattern selector in a manner that the monostable multivibrators oscillate when the pattern selector is operated;
- and a second memory connected to the pulse generator, the first memory and said plurality of monostable multivibrators, the second memory operating in a manner that each time an oscillation of the monostable multivibrators takes place, a stitch control signal is read out of the first memory and temporarily stored in the second memory, and each time the pulse generator generates a pulse, a stitch control signal temporarily stored in the second memory is read out therefrom and used to vary needle position and fabric feed.
Dependencies are inferred from the claim text.