Stitch pattern sewing machine

An automatic sewing machine comprising:

• means for forming stitches on a workpiece, including a reciprocatory needle and a looptaker cooperating with said needle;
• a workholder for holding said workpiece during sewing operation.
• drive means connected to at least one of said workholder and said stitch forming means, and operative to vary the relative position between said workholder and said needle;
• memory means for storing a combination pattern information corresponding to a combination stitch pattern to be formed on said workpiece, said combination pattern information consisting of plural blocks of predetermined unit pattern information each of which corresponds to respective plural unit stitch patterns and predetermined distance information between adjacent ones of said unit stitch patterns;
• manually operable means to generate a command signal for designating the size of each of said unit stitch patterns and the individual distance between said adjacent ones of said unit stitch patterns;
• and
• control means for modifying each of said plural blocks of predetermined unit pattern information and each of said predetermined distance information according to said command signal and for supplying the modified information to said drive means synchronously with said sewing operation.

In an automatic sewing machine having:

• a stitch forming insturmentality including an endwise reciprocatory needle;
• a drive motor for reciprocating the needle to produce stitches on a workpiece;
• circuit means for operating the drive motor;
• drive means operative to vary the relative position between the needle and the workpiece;
• memory means for storing the position data between the needle and the workpiece in the predetermined sequence, said position data including movement data indicative of the amount of the movement of the workpiece relative to the needle and direction data indicative of the direction of movement of the workpiece relative to the needle;
• and
• first control means to control said circuit means for driving said drive motor, to read out said position data from said memory means in the predetermined sequence and to supply said position data to said drive means synchronously with rotation of said drive motor, the improvement comprising;
• means for generating a timing pulse asynchronous to the rotation of said drive motor,
• second control means to control said circuit means for stopping said drive motor, for reading out said movement data and direction data from said memory means in the reverse sequence of said predetermined sequence, modifying the direction data of the position data and supplying the modified position data to said drive means synchronously with said timing pulse, without operating said drive motor, and
• means for selecting the operation of either one of said both control means.

An automatic sewing machine comprising:

• means for forming stitches on a workpiece, including a reciprocatory needle and a looptaker cooperating with said needle;
• a workholder for holding said workpiece during sewing operation;
• drive means connected to at least one of said workholder and said stitch forming means, and operative to vary the relative position between said workholder and said needle;
• first memory means for storing plural blocks of unit pattern information each of which corresponds to respective predetermined plural unit stitch patterns, each of said plural blocks of unit pattern information consisting of a plurality of position data related to the relative position between said workholder and said needle;
• first manually operable means for generating selection commands to select at least two desired blocks of unit pattern information from said first memory means;
• second memory means for storing said selection commands generated by said first manually operable means in the order of the selection operation conducted through said first manually operable means;
• second manually operable means to generate a first command signal representative of the size of each of the individual unit stitch patterns selected by said selection commands, and a second command signal representative of desired number of stitches to be formed in said unit stitch pattern;
• and
• control means for modifying the position data of the selected unit pattern information according to said first and second command signals generated by said second manually operable means and supplying the modified position data to said drive means in timed relation with the reciprocation of said needle.

An automatic sewing machine comprising:

• means for forming stitches on a workpiece, including a reciprocatory needle and a looptaker cooperating with said needle;
• a workholder for holding said workpiece during sewing operation;
• drive means connected to at least one of said workholder and said stitch forming means, and operative to vary the relative position between said workholder and said needle;
• first memory means for storing plural blocks of unit pattern information each of which corresponds to respective predetermined plural unit stitch patterns, each of said plural blocks of unit pattern information consisting of a plurality of position data related to the relative position between said workholder and said needle, and being prepared so that a unit stitch pattern to be formed according thereto is accommodated within a predetermined area defined by a quadrangle;
• second manual means to generate a first command signal representative of the size of each of the individual unit stitch patterns selected by said selection commands, and a second command signal representative of the direction of arrangement so that said selected unit stitch patterns are arranged with one of the apexes of said quadrangle being placed on a straight line;
• and
• control means for modifying the position data of the selected unit pattern information according to said first and second command signals generated by said second manual means and supplying the modified position data to said drive means in timed relation with the reciprocation of said needle.