Apparatus and method for controlling position of embroidery frame

An apparatus to control a position of an embroidery frame in an embroidery machine, the embroidery machine having the embroidery frame to fix a fabric, the apparatus comprising:

• an X-axis driver to move the embroidery frame along an X-axis direction;
• a Y-axis driver to move the embroidery frame along a Y-axis direction;
• a sensor to sense a displacement of the embroidery frame to the X-axis and Y-axis directions, and outputting electric signals corresponding to the sensed displacement of the embroidery frame;
• and
• a controller to generate X-axis and Y-axis drive control signals based on the electric signals from the sensor in order to control the X-axis and Y-axis drivers, respectively,
• wherein the controller includes:
• a position detector to detect the displacement of the embroidery frame based on the electric signals from the sensor;
• a speed detector to detect a transport speed of the embroidery frame based on the displacement of the embroidery frame sensed by the sensor;
• and
• a current detector to detect first and second motor drive current signals provided from the X-axis and Y-axis drivers,
• wherein the controller generates the X-axis and Y-axis drive control signals using the displacement of the embroidery frame detected by the position detector, the transport speed of the embroidery frame detected by the speed detector, and the first and second motor drive current signals detected by the current detector.

A method to control a position of an embroidery frame which moves the position of the embroidery frame along X-axis and Y-axis directions according to X-axis and Y-axis drive control signals from X-axis and Y-axis drivers, the method comprising:

• detecting an electric signal corresponding to a displacement after moving the embroidery frame along an X-axis and a Y-axis;
• and
• generating the X-axis and Y-axis drive control signals based on the electric signal detected, wherein generating the X-axis and Y-axis device control signals based on the electric signal detected includes:
• detecting the displacement of the embroidery frame based on the electric signal detected;
• detecting a transfer speed of the embroidery frame based on the displacement of the embroidery frame detected;
• detecting motor drive current signals which the X-axis and Y-axis drivers output;
• and
• generating the X-axis and Y-axis drive control signals using the displacement of the embroidery frame detected, the transfer speed of the embroidery frame detected, and the motor drive current signals detected.