US 4,365,565 A · Control apparatus for automatic embroidery sewing machine

Abstract

A control apparatus for the embroidery sewing machine which comprises at least two D.C. servomotors for providing controlled power output for driving an embroidery frame, one pair of sensors responsive to rotation of the servomotors for providing detect signals in the form of feedback signals, a presettable counter located at pre-stage to a servomotor drive output amplifier circuit and having an input of the feedback signals in the form of up/down signals, the presettable counter containing a preset value for one stitch operation and counting up or down toward making the preset value zero according to the feedback signal resulting in a residual value if the servomotors are incompletely actuated, and correcting means for superposing the residual value in the counter with a value to be set therein for the next succeeding stitch operation, whereby integral accumulation of errors due to incomplete actuation of each servomotor for each stitch operation can be effectively eliminated. The control apparatus further includes indicator elements which tell the appropriate operation in progress and the completion thereof, and control keys which permit a repetitive operation including a return and an advance, a stop, etc. as required.

Claims18

Dependent claims

A control apparatus for embroidery sewing machine which sequentially reads out embroidery frame driving data of each stitch for embroidery sewing stored in a memory means, and actuates an embroidery frame-supporting/driving means in x- and y-axis directions synchronized with operation of a sewing machine through two controlled servomotors on each stitch, thereby controlling feed of a base cloth spanned on the embroidery frame stitchingly drawing a locus of a plane figure;

wherein the improvement comprises:
two direct current servomotors as said two servomotors;
means for producing a feed back pulse signal according to a rotation angle in a respective rotation sense by way of coding each rotation sense and angle of each servomotor output shaft;
an up/down counter which registers a preset x- or y-axis driving data through an adder, yields a servo control signal for each of said servomotors according to the preset data, and counts up or down toward making the preset data zero according to said feed back pulse signal resulting in a residual data if the servomotor is incompletely actuated;
means for correction by superposing said x- or y-axis driving data for a next stitch with the residual data by temporally memorizing the residual data slightly preceding a timing whereat said x- or y- axis driving data for the next stitch is supplied from said memory means to said adder;
wherein integral accumulation of errors on incomplete actuation of each servomotor is capable of being eliminated or reduced.

3 more elements

A control apparatus for the embroidery sewing machine which sequentially reads out embroidery frame driving data for each embroidery sewing stitch operation stored in memory means, and actuates an embroidery frame-supporting/driving means in x- and y-axis directions synchronized with the operation of the sewing machine through two controlled servomotors on each stitch, thereby controlling the feed of a base fabric or cloth ground spanned on the embroidery frame stitchingly drawing a locus of a plane figure, wherein the improvement comprises:

computer means for controlling the operation and cloth feeding of the sewing machine in accordance with a sequence of programmed embroidery frame drive data stored in a memory means, said computer means logically interpreting the content of codes in said program sequence at each change from one code or step to another, and providing each corresponding indication output and simultaneously causing the machine operation to be arrested;
a plurality of indicator elements on the operator console of the sewing machine and responsive to said indication output of said computer means for being energized to inform the operator of a change in the steps;
and
a plurality of repetitive control keys on the operator console operable to return or advance said program sequence to any selected code or step therein.

1 more element

Dependencies are inferred from the claim text.

Control apparatus for automatic embroidery sewing machine

Life of this patent

Control apparatus for automatic embroidery sewing machine

Life of this patent

Abstract

Claims18