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Static Testing of an Infrared Transmissive Ribbon Sensor

IP.com Disclosure Number: IPCOM000039522D
Original Publication Date: 1987-Jun-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Garner, RC: AUTHOR [+2]

Abstract

An infrared transmissive ribbon sensor is used in a printer to sense when a ribbon cartridge is exhausted of its supply through an infrared light source transmitting to a sensor through a window in the cartridge when the ribbon supply is exhausted and does not block the window. A testing device enables a static test to determine whether the source and sensor are properly positioned within the printer. A testing device is disposed within a printer where a ribbon cartridge is to be positioned; this is between an infrared light source 1 and an infrared sensor 2.

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Static Testing of an Infrared Transmissive Ribbon Sensor

An infrared transmissive ribbon sensor is used in a printer to sense when a ribbon cartridge is exhausted of its supply through an infrared light source transmitting to a sensor through a window in the cartridge when the ribbon supply is exhausted and does not block the window. A testing device enables a static test to determine whether the source and sensor are properly positioned within the printer. A testing device is disposed within a printer where a ribbon cartridge is to be positioned; this is between an infrared light source 1 and an infrared sensor 2. It is necessary to determine whether the sensor 2 is properly positioned within the printer so that the sensor 2 will sense when the ribbon cartridge no longer has a supply ribbon therein by the infrared transmission from the source 1 passing through a window in the ribbon cartridge and being sensed by the sensor 2. The testing device includes a holding fixture 3 having a vertical wall 4 with a pair of windows 5 and 6 therein and separated by a segment 7 of the wall 4. The window 5 and the segment 7 of the wall 4 are the size of the window in the ribbon cartridge.

A housing of the printer supporting the light source 1 also supports a MYLAR* ribbon trailer material 8. The material 8 is used to prevent dirt from accumulating on one side of the ribbon cartridge window when the ribbon cartridge is positioned within the printer.

Thus, the light source 1 has the infrared light pass through the material 8. If the light source 1 and the sensor 2 are properly positioned, the sensor 2 will indicate no infrared light transmissio...