Stitch pattern sewing machine

An automatic sewing machine comprising:

• stitch forming means including a reciprocatory needle;
• a workholder for holding a workpiece during sewing operation, said workholder being movable in a coordinate plane defined by X and Y axes which are perpendicular to one another;
• drive means to move said workholder along said X and Y axes for varying the relative position between said workholder and said needle to form a unit stitch pattern consisting of plural cell patterns a majority of which are each defined by a respective one of plural quadrangular parts of a sphere in which said unit stitch pattern is to be formed, said sphere being predeterminately divided into said quadrangular parts;
• memory means for storing unit stitch pattern information including plural blocks of cell pattern information corresponding to said plural quadrangular parts and each including X and Y coordinate data representing location of apexes of each of said quadrangular parts;
• manually operable input means for setting up desired number of stitches to be formed in each of said cell patterns, said manually operable input means generating stitch number data corresponding to said number of stitches;
• and
• control means for calculating coordinate position data related to actual stitch positions in said unit stitch pattern according to said coordinate data and said stitch number data, and for supplying the calculated coordinate position data to said drive means in timed relation with reciprocation of said needle.

An automatic sewing machine comprising:

• stitch forming means including a reciprocatory needle;
• a workholder holding a workpiece during sewing operation and movable along X and Y axes perpendicular to one another;
• drive means for moving said workholder along said X and Y axes and thereby varying the relative position between said workholder and said needle to form a letter pattern whose area to be sewn is divided into plural geometrical parts a majority of which are quadrangles;
• memory means for storing letter pattern information including plural blocks of geometrical information corresponding to said quadrangles and each including X and Y coordinate data representing location of corner points of said quadrangles;
• manually operable input means for setting up desired number of stitches to be formed in each of said geometrical parts, said manually operable input means generating stitch number data corresponding to said number of stitches;
• and
• control means for calculating coordinate position data related to actual stitch positions in said letter pattern according to said coordinate data and said stitch number data, and for supplying the calculated coordinate position data to said drive means in timed relation with reciprocation of said needle.