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Parallel Link Platen Mechanism

IP.com Disclosure Number: IPCOM000045405D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Choberka, JM: AUTHOR

Abstract

In designing wire matrix printers which are to operate with variable thickness forms, it is necessary to provide a means to control the gap between the printhead and the form so that the gap remains constant regardless of the thickness of the form. The mechanism shown in the figure provides a means of raising and lowering a platen by using a set of parallel links and an adjusting screw or cam to accommodate the varying forms thickness. This eliminates the need to adjust the printhead as is conventionally done.

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Parallel Link Platen Mechanism

In designing wire matrix printers which are to operate with variable thickness forms, it is necessary to provide a means to control the gap between the printhead and the form so that the gap remains constant regardless of the thickness of the form. The mechanism shown in the figure provides a means of raising and lowering a platen by using a set of parallel links and an adjusting screw or cam to accommodate the varying forms thickness. This eliminates the need to adjust the printhead as is conventionally done.

The device shown in the figure consists of a platen 10 connected to a base 12 by a pair of pivotable links 14 and 16. The platen 10 is further connected to the base 12 by spring 17 and screw adjustment 18 which can be rotated by knob
20. By initially setting the links at approximately a 53 degree angle from the horizontal, adjustments made by turning knob 20 become nearly linear per increment of screw rotation. Thus, by turning knob 20 and screw 18, the distance between printhead 22 and platen 10 can be easily varied.

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