Control method of contour sewing machine and control apparatus thereof

A contour sewing machine, comprising:

• a sewing holding means which can be moved with holding sewing;
• a pair of driving motors;
• a sewing conveyance means for conveying the driving force of said pair of driving motors by converting at least one of the driving force of said pair of driving motors to approximate linear motion and converting the other to approximate linear motion or linear motion so that said sewing holding means is moved in longitudinal and transverse two directions approximately perpendicular along the surface of a bed;
• an auxiliary storage in which sewing data composed of quantity in which said sewing holding means is moved on rectangular coordinates in longitudinal and transverse two directions mutually perpendicular is stored;
• data input means from/to which sewing data stored in said auxiliary storage can be read or can be read and written;
• data conversion means for converting quantity in which said sewing holding means is moved as said sewing data to coordinate values in the moved position;
• correction table storage means for storing a correction table for correcting the driven quantity of said each driving motor corresponding to coordinate values converted from said sewing data;
• and
• control means for controlling the driven quantity of said pair of driving motors based upon values obtained based upon coordinate values in a position to which said sewing holding means is moved and said correction table.

An contour sewing machine, comprising:

• a workpiece holder;
• a pair of driving motors for driving said workpiece holder in an x-y rectangular coordinate plane in a series of motions relative to a position of a needle, wherein at least one of said series of motions is approximately linear in one of the x and y directions;
• sewing data including x-y coordinate values representing respective x-y coordinate plane positions to which said workpiece holder is moved from a home position;
• coordinate correction data for correcting a driven quantity of a motion of at least one of said driving motors;
• and
• a controller for controlling said driving motors based on said sewing data and said correction data, to thereby move said workpiece holder in a predetermined contour direction.