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Pre-Heat Platen Temperature Controller Algorithms for IBM 3900 Laser Printer

IP.com Disclosure Number: IPCOM000111568D
Original Publication Date: 1994-Mar-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 4 page(s) / 81K

Publishing Venue

IBM

Related People

Bozarth, R: AUTHOR [+4]

Abstract

Disclosed are temperature controller algorithms for the pre-heat platen of the IBM 3900 laser printer. The pre-heat platen of the IBM 3900 printer is divided into four separate sections, with four individual heaters and temperature-monitoring sensors. The two upper sections were set at the factory for 80ºC and the two lower sections were set at 100ºC. In order to get all the four sections to attain a temperature of 135ºC the control elements had to be different for the upper and lower sections of the pre-heat platen. This was accomplished with a quad 10 K ohms of adjustable potentiometer assemblies, with different parallel resistors for the upper and lower sections. The arrays of potentiometers are connected together with a common shaft to move all the four sections the same amount simultaneously.

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Pre-Heat Platen Temperature Controller Algorithms for IBM 3900 Laser
Printer

      Disclosed are temperature controller algorithms for the
pre-heat platen of the IBM 3900 laser printer.  The pre-heat platen
of the IBM 3900 printer is divided into four separate sections, with
four individual heaters and temperature-monitoring sensors.  The two
upper sections were set at the factory for 80ºC and the two
lower sections were set at 100ºC.  In order to get all the
four sections to attain a temperature of 135ºC the control
elements had to be different for the upper and lower sections of the
pre-heat platen.  This was accomplished with a quad 10 K ohms of
adjustable potentiometer assemblies, with different parallel
resistors for the upper and lower sections.  The arrays of
potentiometers are connected together with a common shaft to move all
the four sections the same amount simultaneously.  The parallel range
resistors set the maximum resistance for each potentiometer.  The
parallel resistors are the same for the two upper sections of the
platen.  This helps to track the platen temperatures with respect to
each other.  This temperature range is linear.  The lowest
temperature setting is 80ºC, and the maximum temperature
setting is 136ºC.  This increase in temperature can be
accomplished in increments of 8ºC.  A dial indicator with
seven divisions will provide the temperature setting from
100ºC to 136ºC.

      The parallel set of resistors of the lower...