Typewriting machines – Including adjustment for optimum printing plane
Patent
1989-05-04
1992-07-21
Burr, Edgar S.
Typewriting machines
Including adjustment for optimum printing plane
400 59, 400355, B41J 1120
Patent
active
051317656
ABSTRACT:
A dot matrix printhead is adjusted automatically or manually with respect to a platen in accordance with the thickness of a recording medium on which printing is to occur. When a host data processor sends a control signal to a printer microprocessor to indicate that a recording medium of a different thickness is to be printed, a carrier, which has a first portion supporting the printhead and pivotally and slidably mounted on a front guide rail, is moved so that a shift arm on the carrier engages a right side plate of the frame. This disconnects a ribbon drive motor gear from a ribbon drive gear and moves the ribbon drive motor gear into engagement with a gear train. Rotation of the gear train rotates a gear, which has a threaded shaft and is rotatably supported by a second portion of the carrier slidably mounted on a rear guide rail, to cause pivoting of the first portion of the carrier about the front guide rail to change the gap of the printhead from the platen. When the gap change is completed, the carrier is moved to the left to its recording medium loading printing position and to disengage the ribbon drive motor gear from the gear train and reengage it with the ribbon drive gear. Then, manual adjustment of the spacing of the printhead from the platen may be accomplished.
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Computer Systems Reviews, Jan. 1988, No. 1 "Optional Extras", p. 40.
Bradley John P.
Coffey Johnnie A.
Denny Clifford M.
Okcuoglu Selahattin A.
Brady John A.
Burr Edgar S.
Hilten John S.
Leach, Jr. Frank C.
Lexmark International Inc.
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