| 摘要 |
A system and method detect the location of a workpiece as it passes from a feeding mechanism to a receiving pair of rollers. The system generally consists of a feeding mechanism having a pair of feeding rollers, a pair of receiving rollers, a motor control system for applying a fixed torque to the receiving rollers causing the receiving rollers to rotate, and a tachometer for monitoring the revolution speed of the receiving rollers. The motor control system for revolving the rollers consists of a motor, motor controller and a microprocessor to program the motor speed or torque. A decrease in the revolution speed of the receiving rollers indicates the workpiece has been received by the receiving rollers. An increase in the revolution speed of the receiving rollers subsequent to the decrease in speed indicates the workpiece has been released from the feeding mechanism.
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