Head pressing mechanism of a thermal printer

Details Head pressing mechanism of a thermal printer Head pressing mechanism of a thermal printer

1992-12-03

1995-05-09

Tran, Huan H.

Communications: directive radio wave systems and devices (e.g.,

With particular circuit

Digital processing

346145, 400 55, 400 60, B41J 25304, B41J 25312, B41J 25308, B41J 25316

Patent

active

054144507

ABSTRACT:
A thermal printer comprising a line type thermal head which is arranged substantially in parallel with the shaft of a platen and is swingably supported about the longitudinal central portion thereof can obtain clear printed letters and prevent the abrasion of the platen due to the direct contact between the thermal head and the platen even if the recording paper varies in width or thickness or is set on the platen one-sided. To achieve the above object, members for restricting the swinging of the thermal head are prodded at both end portions thereof, one of the members being adjustable in its restricting position and the thermal head is supported by a head supporting means composed of a head plate, a head frame and tension springs so as to be movable toward or away from the platen so that the thermal head is separated from the platen according to the thickness of the recording paper and does; not contact the platen. When the thermal head is separated from the platen, the stopper portions of the head plate move while contacting the outer circumferences of beatings for supporting the platen so that the printing line of the thermal head is not displaced out of a given printing position.

REFERENCES:
patent: 125871 (1886-06-01), Hashizume

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