Adaptive electronic control system for formed character printer

Details Adaptive electronic control system for formed character printer Adaptive electronic control system for formed character printer

1985-02-20

1987-03-31

Sewell, Paul J.

Typewriting machines

Including type-set-assemblage mounted on carrier and...

Including type-faces movable relative to type-face-carrier

101 9319, 400322, B41J 130

Patent

active

046539468

ABSTRACT:
A nominal carriage velocity profile is initiated during each carriage positioning interval which enables the carriage to be decelerated and stopped at the proper position for printing. However, the carriage velocity profile can be modified during the positioning interval to avoid decelerating if printing can occur on the fly; i.e., if the print element (and ribbon) are able to complete any necessary positioning by the time the carriage arrives at its printing position. In accordance with the preferred embodiment, the slave microprocessor produces a READY signal in advance of the print wheel arriving at its destination orientation. The READY signal indicates that both the print wheel and ribbon will reach their destinations and be ready for printing within a fixed time interval; e.g., three milliseconds. In response to the READY signal, the master microprocessor inhibits further adjustments in the carriage speed and permits the carriage to assume a "fly" mode. Additionally, from known carriage position and velocity information, the master microprocessor determines the time at which the carriage will pass through the printing position and when the hammer is to be fired.

REFERENCES:
patent: 4030591 (1977-06-01), Martin
patent: 4044880 (1977-08-01), Martin
patent: 4101006 (1978-07-01), Jensen
patent: 4251161 (1981-02-01), Cresti

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