OPERATION

The spindle drive is controlled by a digital inverter drive, capable of both driving and braking the motor. Material is fed to the spindle via a springloaded dancer for tension control. The dancer is equipped with a position feedback sensor which, together with the PID controls on the trim winder control board provides a speed reference for the spindle drive. The system operates to maintain the dancer in a fixed position, and thus provide a fixed rewinding tension. The actual tension is set by the position of the dancer. When the dancer is close to the infeed roller, the tension, and thus the trim tension is high. When the dancer is furthest away from the infeed roll, the tension is at its lowest. Actual dancer position is set by the internal set tension potentiometer. The dancer is mounted on a cross travel mechanism, and acts as a layering guide to the trim.

The cross travel is controlled by a lead screw and nut with automatic end reversing, so that the lead screw always rotates in one direction. The traverse motor is controlled by a digital inverter drive operating directly from the AC supply. A setpoint isolator on the control board links the winding motor speed reference with the traverse motor so that they operate in unison. The winder can be stopped and started from the remote control pushbuttons. Alternatively, the winder can be directly linked to stop and start with the main feed machine. A trim break detector on the control operates 3 seconds after start up to stop the winder if the dancer has not been pulled off its end stop position.

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