Sewing machine input signal waveshaping

Details Sewing machine input signal waveshaping Sewing machine input signal waveshaping

1978-07-31

1979-06-26

Nerbun, Peter

Sewing

Work manipulating

Guides

318397, D05B 302

Patent

active

041590023

ABSTRACT:
In an electronically controlled sewing machine, new stitch position coordinate information is retrieved from a solid state memory and transferred to the sewing machine servo system one bit per some proportional clock period, at either a fast stepping rate or a slow stepping rate depending upon the speed of the sewing machine. By use of suitable logic gates, a low speed condition will initiate a slow stepping rate of some fraction of a predetermined clock period, whereas a high speed condition will initiate a fast stepping rate of once every clock period. The new data from the solid state memory is fed to a comparator wherein it is compared to the immediately prior stitch position coordinate information transferred to the servo system and retained in an up/down counter. The comparator determines whether the new data requires an up or a down count of the counter. The signal from the up/down counter is transferred to a pulse width modulator, the output of which is fed to a digital to analog converter for the appropriate bight or feed servo system of the sewing machine. In effect, the pulse width modulated signal transferred to the servo system is a ramp signal of steep or shallow slope dependent on whether the sewing machine is operating above or below a predetermined speed.

REFERENCES:
patent: 3859581 (1975-01-01), Gardner
patent: 4016821 (1977-04-01), Minalga

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