Browse Prior Art Database

Retracting Optical Transmissive Ribbon Position Sensor

IP.com Disclosure Number: IPCOM000036783D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Lansing, SG: AUTHOR [+3]

Abstract

This article describes a means for detecting printer ribbon presence or printer ribbon edge position using a light-emitting diode (LED) and a retracting photo-detection device that are located on opposite sides of the ribbon.

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Retracting Optical Transmissive Ribbon Position Sensor

This article describes a means for detecting printer ribbon presence or printer ribbon edge position using a light-emitting diode (LED) and a retracting photo-detection device that are located on opposite sides of the ribbon.

In the figure, the sensor housing assembly is shown. The photo- detection portion 1 of the sensor is mounted to the retractable/pivoting sensor arm 2. The LED portion 3 of the sensor is mounted to the fixed part of the sensor housing assembly 4. The ribbon 5 is shown between both sensor halves 1 and 3.

When the ribbon is installed or removed, the retractable/pivoting sensor arm 2 rotates counter-clockwise away from the ribbon, as shown in broken lines at 6.

The retracting feature of the photo-detection device provides for error-free installation of the printer ribbon. This feature also provides for the required alignment of the LED and photo-detection device during normal printer operation, thus improving both customer usability and sensing reliability.

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