Browse Prior Art Database

Dynamic Head to Platen Gap Measuring Tool

IP.com Disclosure Number: IPCOM000045398D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Gianmoena, AG: AUTHOR [+3]

Abstract

The IBM 5225 wire matrix printer uses print wire actuators that cycle at a high repetition rate but have extremely limited stroke. For this reason, the distance from the tip of the actuator to the platen is very critical. This distance can be measured statically with feeler gauges. However, it is important to know how this distance varies dynamically when the printer is operated. The device for determining dynamic motion between the actuator carrier assembly and the platen is shown in the figure.

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Dynamic Head to Platen Gap Measuring Tool

The IBM 5225 wire matrix printer uses print wire actuators that cycle at a high repetition rate but have extremely limited stroke. For this reason, the distance from the tip of the actuator to the platen is very critical. This distance can be measured statically with feeler gauges. However, it is important to know how this distance varies dynamically when the printer is operated. The device for determining dynamic motion between the actuator carrier assembly and the platen is shown in the figure.

The tool uses a Hall effect device 10, the output of which may be monitored and captured by means such as an oscilloscope. Two print wire actuators are removed from the printer to permit installation of the tool. A follower 12 with a hard spherical tip 14 rides against the platen 16 as the actuator carrier assembly 18 moves from side to side. If it is desired to print while monitoring the motion, the follower 12 may be allowed to press against the ribbon 20 and paper 22. A spring 24 insures that the follower 12 is always against the platen 16 or ribbon
20. The position change of a metal disk 26 on the back end of the follower 12 results in the corresponding change of the output signal from the Hall effect sensor 10. The measuring tool and the signal-sensing equipment are calibrated as a unit prior to the installation of the tool on the printer.

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