Method and apparatus for controlling an automatic bar tacking ma

Details Method and apparatus for controlling an automatic bar tacking ma Method and apparatus for controlling an automatic bar tacking ma

1975-09-29

1977-09-27

Schroeder, Werner H.

Sewing

Special machines

Darning

D05B 2100

Patent

active

040503933

ABSTRACT:
This invention relates to an automatic sewing machine in which the workpiece is moved under the sewing head by means of a clamp which is driven by stepping motors along two coordinate axis through a predetermined pattern. The stepping motors are connected to the workpiece clamp through a non-linear linkage assembly. The stepping motors are controlled by a coded Programmable Read Only Memory (PROM) which generates signals in timed relation to the operation of the sewing machine. The PROM is coded by first digitizing the stitch coordinates of the predetermined pattern and then modifying each of the coordinate values to compensate for the non-linearity of the linkage system.

REFERENCES:
patent: 3742879 (1973-07-01), Schaefer, Jr.
patent: 3820082 (1974-06-01), Bauknecht
patent: 3830175 (1974-08-01), Levor
patent: 3855956 (1974-12-01), Wurst
patent: 3982491 (1976-09-01), Herzer et al.

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