Printer ribbon motor controller

Details Printer ribbon motor controller Printer ribbon motor controller

1993-05-11

1994-11-22

Burr, Edgar S.

Typewriting machines

Including interposed inking device for record-medium

Ribbon-feeding mechanism

400225, 400239, 318 89, 318696, B41J 3314

Patent

active

053663039

ABSTRACT:
This disclosure sets forth a dot matrix printer having an improved ribbon drive. The ribbon drive is provided by two respective stepper motors. When one stepper motor is in a take-up mode, the second is in a feed mode. The process is reversed proximate the end of the tape as it is unwound. A re-generative mode for the feed motor is provided and a resistance bank varies amounts of drag on the ribbon as it is fed from the feed motor spool. Both motors when in the take-up mode are driven by full H bridge drivers and amplifiers controlled by a micro controller through an address and decode input and output latch. In order to provide for a uniform velocity of the print ribbon the angular velocity of the take up motor is controlled by counting the zero crossings of the feed motor, and then loading it into the micro controller to compare it with a look-up table for purposes of providing a proper speed to the take-up motor and the proper peak drag through the resistance bank to the feed motor. All functions are controlled by the micro controller and firmware logic provided thereto.

REFERENCES:
patent: 4103216 (1978-07-01), Hayes
patent: 4177731 (1979-12-01), Kliest et al.
patent: 4224628 (1980-09-01), Murray
patent: 4349771 (1982-09-01), Buxton
patent: 5187419 (1993-02-01), DeLange

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