Thermal printing head
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United States of America Patent
Stats
-
Oct 8, 1991
Grant Date -
N/A
app pub date -
Mar 20, 1990
filing date -
Mar 21, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A thermal printing head (10) is described which comprises a supporting frame (12, 14, 16, 18, 20, 22) and a thermal printing plate (28). Several individually triggerable heating elements are provided along a line on the front side of the thermal printing plate (28). The thermal printing plte (28) is held in frictional contact with a counter-pressure roll (26) rotatably mounted in the supporting frame. The line of heating elements contacts the counter-pressure roll along a paraxial generating line. At least one locking hook (38, 40) being in engagement with a pin fixed on the supporting frame is provided on the thermal printing plate (28) to be spaced apart from the line of heating elements. At least one pressure spring (54, 56) is provided in the region situated between the at least one locking hook (38, 40) and the line of heating elements between a stop (62, 64) being in fixed connection with the supporting frame and the rear side of the thermal printing plate (28). The at least one pressure spring (54, 56 ) is secured on the thermal printing plate (28) by means of a retaining means (50, 52, 48).
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