Apparatus for driving printing head of wire-dot impact printer

Details Apparatus for driving printing head of wire-dot impact printer Apparatus for driving printing head of wire-dot impact printer

1990-03-13

1992-01-07

Eickholt, Eugene H.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, 310314, 395108, B41J 312

Patent

active

050785206

ABSTRACT:
An apparatus for driving a printing head of a wire-dot printer, the head including a plurality of electroexpansive elements for driving respective printing wires cooperatively constituting a wire-dot matrix and in accordance with print pattern data designating the existence, or non-existence, of a dot to be printed by the respective, plural dot-impact printing wires in each of a succession of print cycles. Each electroexpansive element, selectively, is expanded and shrunk by an electrical charge/discharge, thereby to move the respective printing wire and perform a dot printing operation. The time intervals T1 and T2 respectively for the charge and discharge in each of a succession of printing cycles are: in the case of continuous dots, T1=A, T2 -B' for the first dot, T1=A', T2-B' for successive dots intermediate the first and the last dots, and T1=A', T2-B for the last dot of the continuous dots, and in the case of a single dot, T1=A, T2=B, wherein A>A', and B>B'.

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"Timing Generation Logic for Dot Matrix Printer" IBM Tech. Discl. Bulletin, vol. 32, No. 1, 6/89, pp. 120-122.

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