FRAME MOVEMENT CONTROL UNIT FOR AUTOMATICALLY EMBROIDERING MACHINE

摘要

PROBLEM TO BE SOLVED: To provide a frame movement control unit designed to change the rotative speed of a pulse motor over a wide range from low to high levels through preventing the output torque drop during the pulse motor's high-speed rotation. SOLUTION: This control unit is so designed that a pulse width det value D corresponding to the pulse width of drive pulse signal for making a drive control of a pulse motor is multiplied by a rotative speed parameter PA set so as to increase in proportional to the rotative speed of the pulse motor to calculate a corrected pulse width set value E1; thereby, the pulse width of the drive pulse signal can be corrected so as to increase in proportional to the rotative speed of the pulse motor, preventing the electric current passing through the coil of the pulse motor from decreasing as the rotative speed of the pulse motor increases.