Browse Prior Art Database

Forms Compensation for Point of Sale Printers

IP.com Disclosure Number: IPCOM000121601D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 2 page(s) / 73K

Publishing Venue

IBM

Related People

Harris, RH: AUTHOR

Abstract

Point of sale printers must print well on a wide variety of form thicknesses. The thicker forms require the maximum print force because these usually have multiple copies. Studies have shown that it is desirable to change the print head gap only 55% to 80% of the thickness of the form. A further requirement is that an entire line is to be printed when the form only covers a portion of the print line (form plus journal). This invention satisfies both of these requirements.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Forms Compensation for Point of Sale Printers

      Point of sale printers must print well on a wide variety
of form thicknesses.  The thicker forms require the maximum print
force because these usually have multiple copies. Studies have shown
that it is desirable to change the print head gap only 55% to 80% of
the thickness of the form.  A further requirement is that an entire
line is to be printed when the form only covers a portion of the
print line (form plus journal).  This invention satisfies both of
these requirements.

      The figure shows the disclosed transport of a point of sale
printer.  The carrier is divided into two parts, the guide carrier
and the head carrier.

      The guide carrier slides along and rotates around the front
guide rod, is driven by the drive belt, and is attached to the gap
roller and the head lift roller.  The gap roller rolls below the
print line against the front face of the media to be printed.  The
head lift roller encounters a head lift cam at the end of each print
line allowing a line feed or a document to be inserted.

      The head carrier is pivotally attached to the guide carrier,
slides on the rear guide rod, and is attached to the print head.  An
extension spring forces the guide carrier clockwise and the gap
roller against the front surface of the document.  Both parts are
intended to be made of injection molded plastic with metal supports
and pivots where needed.

      The proper print head gap for the normal thickness paper is set
by design.  As the gap roller rolls over the normal media, the proper
gap is assured.  When a thicker d...