Ribbon Drive Apparatus for Printer
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
This apparatus provides (1) ribbon reversal without the need of sensing devices and (2) improved ribbon tracking that is less dependent on tolerance factors. Ribbon reversal in a reel-to-reel ribbon drive is accomplished without using sensing arms or switches. Most reel-to-reel drives employ a grommet or similar device near the end of the ribbon which actuates a switch or mechanical reversing mechanism. Such devices may have operational difficulties and threading of the ribbon is usually complicated. In the apparatus shown in the drawing, stepper motors are used and electrical ribbon reversal circuitry so that no switches, grommets, or sensing arms are required. As one stepper motor is driving the ribbon, the other motor is used as an emitter or pulse generator.