Forms Carriage Control Algorithm
Original Publication Date: 1988-Mar-01
Included in the Prior Art Database: 2005-Feb-14
High-speed paper carriage motion is stopped with improved accuracy by determining carriage velocity at several times during deceleration and applying a stopping current commensurate with the measured velocity at each determination. A stopping algorithm for a microprocessor, when used to control carriage deceleration, is set out in Figs. lA-lC, assembled as in Fig. 1. In this procedure, velocity is indirectly determined by measuring the time a carriage emitter 1 requires to move a preselected displacement, indicated as a number of degrees. The deceleration current appropriate for that velocity is then found by table look-up and applied to drive motor 2 stopping carriage 3. The velocity determination and table look-up of applied current are repeated as frequently as desired to establish the stopping velocity profile.