Typewriting machines – Including adjustment for optimum printing plane
Patent
1997-06-06
1998-06-30
Bennett, Christopher A.
Typewriting machines
Including adjustment for optimum printing plane
400 56, 400 59, B41J 1120
Patent
active
057723397
ABSTRACT:
An automatic adjusting device for accurately adjusting a platen gap including an encoder 14 for outputting pulse signals in accordance with a moving distance of a carriage, a pulse width detector for detecting a pulse width of the pulse signal when the carriage is moved from a reference position in a direction of the platen, a difference calculator for calculating a difference between a pulse width of the pulse signal sent from the pulse width detector and a pulse width of a stored pulse signal, a contact detector for judging a contact position of the recording head with the platen surface by comparing the difference with the reference value, and a controller for controlling a platen gap in accordance with the thickness of a recording medium charged on the platen detected by a pulse signal sent from the encoder and a signal sent from the contact detector. A change in the pulse width caused by resistance on the carriage is subtracted by the difference detector to obtain correction data so that the contact point can be accurately detected.
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Bennett Christopher A.
Seiko Epson Corporation
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