Zero hammer adjustment drum printer control technique

Details Zero hammer adjustment drum printer control technique Zero hammer adjustment drum printer control technique

1993-09-27

1995-01-24

Burr, Edgar S.

Printing

Selective or progressive

Bed and platen machines

101 9314, 101 9329, 400146, 4001573, B41T 936

Patent

active

053833996

ABSTRACT:
A method and apparatus for controlling the adjustment of printer hammers which impact against an associated moveable member on which characters are present. Each hammer includes a coil which is energized at the appropriate time, taking into consideration the "flight time" of the associated hammer. These flight times are determined by detecting a change in the back EMF in the energizing current to the coil. These flight times are averaged to obtain a running average of the last several successive flight times (for each hammer in the printer), and successive timing pulses from a timing disc are used to obtain an almost instantaneous velocity of the moveable member (like a printer drum) just prior to a character to be printed. The last several successive flight times are stored in a non-volatile RAM of a controller to enable the printer to be ready at a next start up.

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IBM Technical Disclosure Bulletin, vol. 34, No. 7B Dec. 1991; "Print Hammer Flight Time Compensation For Supply Voltage Variation".
IBM Technical Disclosure Bulletin, vol. 27, No. 4B Sep. 1984 "Flight Time System For a High Speed Impact Printer".

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