Wire-dot impact printer

Details Wire-dot impact printer Wire-dot impact printer

1993-02-09

1994-03-22

Burr, Edgar S.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

4001573, 400166, B41J 944

Patent

active

052957500

ABSTRACT:
In a wire-dot impact printer having a capacitance detector for detecting a displacement of each armature by a sensor electrode arranged opposite the armature, a space is formed between each sensor electrode and its associated armature, and a shield pattern is formed with a small space left around each sensor electrode. The shield pattern is fed with a potential at least equal to the potential of each sensor electrode. This makes it possible to reduce the influence of noise upon detection of a capacitance by the capacitance detector. A noise canceling electrode is also disposed around each sensor electrode and is connected to the sensor electrode, whereby a noise canceling circuit is further provided to eliminate noise voltage. The noise canceling circuit can eliminate a noise voltage picked up by the sensor electrode and the noise canceling electrode.

REFERENCES:
patent: 4208137 (1980-06-01), Liu et al.
patent: 4940343 (1990-07-01), Kikuchi et al.
patent: 5030020 (1991-07-01), Kikuchi et al.
patent: 5039238 (1991-08-01), Kikuchi et al.
patent: 5071268 (1991-12-01), Tanuma et al.

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