Browse Prior Art Database

Printer Stacker Jam Detector

IP.com Disclosure Number: IPCOM000112461D
Original Publication Date: 1994-May-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Jessen, RF: AUTHOR [+2]

Abstract

Disclosed is a method of connecting paper motion and stacker jam sensor outputs in a computer printer. The result is just one signal wire that contains paper status information from both sensors.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 61% of the total text.

Printer Stacker Jam Detector

      Disclosed is a method of connecting paper motion and stacker
jam sensor outputs in a computer printer.  The result is just one
signal wire that contains paper status information from both sensors.

      In the Figure, paper 1 is shown passing through the print
engine 2 in the indicated direction.  The open-collector stacker jam
sensor 3 is located in the output stacker area of the printer and the
open-collector paper (or forms) motion sensor 4 is located in the
paper feed area before the print engine.  The stacker jam sensor is a
switch that is activated by the paper build up in the stacker area of
the machine that corresponds to a paper jam.  This switch is held
activated by the paper jam and operator intervention is required.
The paper motion sensor contains a wheel with several apertures whose
rotation alternately activates and deactivates the sensor output to
produce a pulse train that corresponds to paper movement.  This pulse
signal is used with other known information about the expected paper
movement by the printer's logic to determine if there is an
inconsistency that would indicate a paper motion problem requiring
operator intervention.  An example of a paper motion problem is torn
sprocket holes causing the paper not to move.  The paper motion
sensor cannot reliably detect a paper jam before over-printing
occurs.  Likewise, the stacker jam sensor cannot detect paper motion
problems.  So, a need exists for infor...