Pattern stitching speed control system for electronic sewing mac

Details Pattern stitching speed control system for electronic sewing mac Pattern stitching speed control system for electronic sewing mac

1977-06-03

1978-08-22

Nerbun, Peter

Sewing

Work manipulating

Guides

318305, 318342, 318348, 112220, D05B 302, D05B 6918

Patent

active

041080939

ABSTRACT:
A drive motor drives a reciprocating sewing needle. A static memory has lateral-control-signal outputs at which it furnishes signals indicating how much the needle should be laterally shifted for each stitch in a selected pattern, and feed-control-signal outputs at which it furnishes signals indicating how much a work feeding device should feed the work for each stitch of the pattern. An addressing circuit response to a pattern selector applies to the static memory a repeated sequence of address signals, causing the memory to produce repeated sequences of lateral-control and feed-control signals at its outputs. The first address signal in any of the repeated sequences of address signals causes the static memory to produce at its output a first lateral-control signal constituting a maximum-speed-establishment signal, and a first feed-control signal constituting a maximum-permissible-speed signal. A latch receives the feed-control signals but does not in general register them, except when activated. A detector receives the lateral-control signals, and in response to the maximum-speed-establishment signal activates the latch which then registers the maximum-permissible-speed signal. A motor speed limiter limits the speed of the drive motor in dependence upon the signal registered by the latch.

REFERENCES:
patent: 3319591 (1967-05-01), Hamlett
patent: 3493832 (1970-02-01), Kay
patent: 3612969 (1971-10-01), Cockroft
patent: 3789783 (1974-02-01), Cook et al.
patent: 3872808 (1975-03-01), Wurst

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