Electrical automatic pattern stitching sewing machine

Details Electrical automatic pattern stitching sewing machine Electrical automatic pattern stitching sewing machine

1977-01-21

1979-03-27

Nerbun, Peter

Sewing

Work manipulating

Guides

D05B 302

Patent

active

041459822

ABSTRACT:
The needle-shifting zig-zag unit and the work feeding unit are moved to different positions, when necessary, for successive stitches, to form a stitching pattern. Each unit is powered by the main rotating drive shaft of the sewing machine. However, each unit is provided with a respective stepper motor. Each stepper motor changes the setting of an adjuster in a reciprocating-motion generator driven by the main drive shaft. When one of these adjusters is in a constant setting, its respective reciprocating-motion generator continually generates reciprocating motion of constant corresponding amplitude, for an unlimited time, so long as the drive shaft rotates. The needle-penetration coordinates for the stitching pattern are established by continually changing the amplitude of the reciprocations performed by the two reciprocating-motion generators. A static memory is read out, in synchronism with sewing, to furnish information commanding the stepper motors to move the amplitude adjusters of the reciprocating-motion generators from one amplitude setting to another, very quickly, to in this way establish all the successive needle-penetration coordinates for even complex stitching patterns.

REFERENCES:
patent: 3872808 (1975-03-01), Wurst
patent: 3982491 (1976-09-01), Herzer et al.

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