Print gap detecting device in print head

Details Print gap detecting device in print head Print gap detecting device in print head

1992-03-09

1993-04-27

Burr, Edgar S.

Typewriting machines

Including adjustment for optimum printing plane

400124, 400703, B41J 1120

Patent

active

052056589

ABSTRACT:
Piezoelectric elements that can resonate at a certain frequency with a coil are extended and contracted as they are repeatedly charged and discharged. The extending and contracting movements of the piezoelectric elements are amplified and transmitted to move the print wires toward and away from the platen. The waveform of a voltage generated across the piezoelectric element is detected by a monitoring device. Then, the detected voltage waveform is compared with the waveform of a voltage that is produced when the print gap is proper, and lets the user to know the magnitude of the print gap between the distal ends of print wires and a platen at any time during printing operation.

REFERENCES:
patent: 4984913 (1991-01-01), Silverman et al.
patent: 5037217 (1991-08-01), Suzuki et al.
patent: 5103680 (1992-04-01), Kanayama et al.

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