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Browse Prior Art Database

Platen Tilt Adjustment Mechanism

IP.com Disclosure Number: IPCOM000060951D
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Harris, RH: AUTHOR

Abstract

In wire matrix printers, the nose of the print head must be carefully aligned to traverse the platen parallel to its surface in both the horizontal and vertical directions. That is, the plane of the ends of the wires of the wire matrix printer must be parallel to the plane of the surface of the platen. Traverse adjustments are made by positioning the ends of the platen in or out and/or by causing the print head to follow the surface of the platen with a roller. This does not take account of any axial rotation of the platen which would cause the plane of the platen surface to intersect the plane of the wire ends of the wire matrix printer. A simple solution is shown in the drawings which permit rotational adjustment of the platen about its longitudinal axis in a simple and reliable way. In Fig.

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Platen Tilt Adjustment Mechanism

In wire matrix printers, the nose of the print head must be carefully aligned to traverse the platen parallel to its surface in both the horizontal and vertical directions. That is, the plane of the ends of the wires of the wire matrix printer must be parallel to the plane of the surface of the platen. Traverse adjustments are made by positioning the ends of the platen in or out and/or by causing the print head to follow the surface of the platen with a roller. This does not take account of any axial rotation of the platen which would cause the plane of the platen surface to intersect the plane of the wire ends of the wire matrix printer. A simple solution is shown in the drawings which permit rotational adjustment of the platen about its longitudinal axis in a simple and reliable way. In Fig. 1, platen 1 of hardened steel or the like has an end mount 3 integrally machined or cast with it. The end mount 3 is resiliently supported in an elastomer block 2 to isolate vibrations from being transmitted to the printer frame (not shown). Angled adjustment surface cam plates 4 are machined on the end mount 3, as shown. A pivot pin 5 is inserted and passes through an aperture 9 in an adjusting plate 6. Adjusting plate 6 has a matching set of cam surfaces 7 to those surfaces 4 on the platen and the mount 3. A slot for a screwdriver or adjusting tool is shown as a slot 8 in the adjusting plate 6. In operation, the adjusting plate 6 may be rotated slightly counterclockwise or clockwise which will cause engagement between the cam surfaces 4 and 7 and rotate the platen 1 about its longitudinal axis by a small amount depending on the direction of rotation of the adjusting plate 6. For example, clockwise rotation of the adjusting plate 6, as shown in Fig. 1, will produce counterclockwise rotation of platen 1 abou...