Browse Prior Art Database

Head to Platen Gap Adjuster

IP.com Disclosure Number: IPCOM000045401D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Moser, MA: AUTHOR [+2]

Abstract

In conventional wire matrix printers, it is necessary to adjust the head-to-platen distance to compensate for varying thickness forms. In the past, this has been done by attaching the paper thickness knob and its standoff bushing to the head adjustment bracket with a binding head screw. The bracket assembly was then attached to the carrier casting with a binding head screw which passes through a slot in the bracket. With the knob set at zero, "the bracket assembly is pushed up against the feeler gauge, which has been inserted and held between the printhead and platen, and the bracket assembly is then tightened in place.

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Head to Platen Gap Adjuster

In conventional wire matrix printers, it is necessary to adjust the head-to- platen distance to compensate for varying thickness forms. In the past, this has been done by attaching the paper thickness knob and its standoff bushing to the head adjustment bracket with a binding head screw. The bracket assembly was then attached to the carrier casting with a binding head screw which passes through a slot in the bracket. With the knob set at zero, "the bracket assembly is pushed up against the feeler gauge, which has been inserted and held between the printhead and platen, and the bracket assembly is then tightened in place.

By adding an eccentric adjuster 10 as shown in the figure, it is possible to set the gap quickly. First, the copy control dial 12 is set to zero and the eccentric adjuster 10 is set to the low point towards the platen. Next, the printhead 14 and bracket assembly are pushed against the platen so that the end of the head wires are in contact with the platen. Next, the head adjustment bracket 16 is tightened to the carrier. Finally, the eccentric adjuster 10 is rotated with a tool, such as an open-ended wrench, until the proper distance, as measured by the feeler gauge, exists between the head and the platen. Thereafter, if anything is moved, it is only necessary to adjust the eccentric adjuster 10 rather than reset the entire mechanism as in the past.

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