Browse Prior Art Database

Sensing Low Paper Supply in a Point of Sale Printer

IP.com Disclosure Number: IPCOM000103782D
Original Publication Date: 1993-Jan-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 1 page(s) / 49K

Publishing Venue

IBM

Related People

Barker, RB: AUTHOR [+2]

Abstract

Point of Sale (POS) printers may have hardware that senses the amount of paper remaining on a supply roll. The purpose of such hardware is to alert the operator that the supply roll requires changing before actually running out of paper. A method is disclosed to improve both the flexibility and consistency of low-paper sensing.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 86% of the total text.

Sensing Low Paper Supply in a Point of Sale Printer

      Point of Sale (POS) printers may have hardware that senses the
amount of paper remaining on a supply roll.  The purpose of such
hardware is to alert the operator that the supply roll requires
changing before actually running out of paper.  A method is disclosed
to improve both the flexibility and consistency of low-paper sensing.

      Existing low-paper sensors use optical or mechanical switches
to detect when the diameter of the paper roll drops below a desired
value.  When the switch is activated, the operator is alerted by an
indicator light or tone.  The actual amount of paper left on a roll
at this time depends upon the diameter of the paper roll core.

      In the disclosed system the signal supplied by the low-paper
sensing hardware is one of three pieces of data used by a software
routine to determine when the operator should be alerted.
1.  The low-paper sensing hardware is factory set to accommodate the
largest anticipated paper roll core  size.
2.  The POS system user specifies the lead time of the low-paper
indication.  (For example, some users want a low-paper indication
with enough remaining paper to handle five or six transactions.
Others want to minimize paper waste; here the indication should occur
with less than 12 inches of paper remaining.).
3.  The POS system user specifies the diameter of paper core used in
the printer.

      With the user-specified data, a software...