Ribbon Take-Up System Using a DC Motor and an Optical Encoder
Original Publication Date: 1985-Mar-01
Included in the Prior Art Database: 2005-Feb-18
A ribbon take-up spool is center driven through gearing from a DC motor, which has its speed controlled so that it runs only as fast as necessary to keep up with ribbon feed. A ribbon take-up spool 1 (Fig. 1) is center driven from a DC motor 2 through gearing to wrap a ribbon 3 around the take-up spool 1. The ribbon 3 passes over a pivotally mounted tension arm 4, which it is desired to maintain at a reference position 5, with the reference position 5 being that at which the motor 2 runs only fast enough to keep up with the feed of the ribbon 3. A spring 6 resiliently biases the tension arm 4 clockwise towards the reference position 5. The tension arm 4 has a linear optical interrupter 7 (Fig. 2) mounted thereon.