Sewing – Special machines – Darning
Patent
1985-08-07
1987-09-22
Nerbun, Peter
Sewing
Special machines
Darning
D05B 2100
Patent
active
046947620
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a sewing machine control apparatus whereby a seam of a predetermined shape is formed while a fabric holding body holding an article to be stitched is moved horizontally relative to a needle rod and then halted.
PRIOR ART
The aforementioned type sewing machines include cycle stitch sewing machines such as lock stitch sewing machines, button hole working sewing machines, button attaching sewing machines and embroidering sewing machines. In particular, a recent electronically controlled sewing machine known in the art is adapted for form a seam of a predetermined shape by coupling a pair of stepping motors to a fabric holding body holding an article to be stitched and controlling the stepping motors on the basis of information stored on an information storage medium such as a floppy disc. When stitching a pattern A.fwdarw.B.fwdarw.C.fwdarw.D of the kind shown in FIG. 4 by the fabric holding body having coordinate axes X, Y and an origin O.sub.1, with the conventional electronically controlled sewing machine the needle is moved from an arbitrary point K to a first needle descent point A through the origin O.sub.1 and then is brought to a stop. However, since the stopping position is decided by such factors as the shape and size of the pattern to be stitched, a drawback is that the needle occasionally becomes an obstacle to a change or insertion of fabric.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a sewing machine control apparatus adapted to move a fabric holding body to a stitching starting point automatically relative to a needle rod, even if the position of the fabric holding body relative to the needle rod is changed, when the machine performs a stitching operation.
Specifically, in a sewing machine having
a needle rod having a needle secured to a lower end thereof and movable up and down in operative association with a main shaft;
a moving body having a fabric holding body to and from which a fabric is capable of being attached and detached, the moving body being freely movably supported on an upper surface of a bed in a plane perpendicular to the direction in which the needle rod moves;
drive means coupled to the moving body in such a manner that the moving body is moved under electrical control in the plane along perpendicularly intersecting X and Y axes individually or along a resultant direction;
memory means for successively storing needle descent position data for each stitching pattern as movement data in the X and Y directions from a stitching starting position to a stitching end position;
means for reading the movement data out of the memory means; and
first control means for driving the drive means in relation to the read movement data;
the present invention provides a sewing machine control apparatus characterized by provision of:
operating means for generating a displacement signal which moves the moving body in the X and Y directions;
second control means responsive to the displacement signal for controlling the drive means to move the moving body to a desired position;
starting means for generating a start signal by a manual operation to start a driving source of the sewing machine;
third control means for storing a signal indicative of the position of the fabric holding body, the position signal being revised at all times based on the displacement signal, and fourth control means responding to the generation of the start signal for controlling the drive means in such a manner that the moving body is moved from a position having X and Y coordinates responsive to the revised position signal to a stitching starting position of a stitching pattern.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a lock stitch sewing machine;
FIG. 2 is a block diagram of a control circuit;
FIG. 3 is a flowchart of a CPU control program;
FIG. 4 is a graph showing the positional relationship between a pattern and a second origin in the conventional lock stitch sewing machine; and
FIG. 5 is a graph illustrat
REFERENCES:
patent: 4135459 (1979-01-01), Manabe et al.
patent: 4582006 (1986-04-01), Yamane
Nukushina Masanori
Takano Kunio
Nerbun Peter
Tokyo Juki Industrial Co. Ltd.
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