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A Method of Handling Forms with Holes in Printers

IP.com Disclosure Number: IPCOM000121807D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 1 page(s) / 63K

Publishing Venue

IBM

Related People

Barker, RB: AUTHOR [+3]

Abstract

Point of sale printers are required to print on a wide range of documents including forms that have holes in the document or in the binding of the document. Printing on a form with holes is not desirable because the print wires can be damaged if they are fired into a hole as the print head is moving across the form. The wire does not retract from the hole in sufficient time to prevent snagging and possible damage.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 54% of the total text.

A Method of Handling Forms with Holes in Printers

      Point of sale printers are required to print on a wide range of
documents including forms that have holes in the document or in the
binding of the document.  Printing on a form with holes is not
desirable because the print wires can be damaged if they are fired
into a hole as the print head is moving across the form.  The wire
does not retract from the hole in sufficient time to prevent snagging
and possible damage.

      Another problem with using forms with holes occurs when the
hole passes under an optical document sensor.  The printer does not
know if the form has skewed or has been removed from the printer.
The resulting condition requires extensive error recovery to aid the
operator in continuing the transaction.

      Through the use of printer microcode, a different method of
handling documents could eliminate both the potential for printing in
holes and the error condition sensed by the optical document sensor
when a hole passes under the sensor.  A microcode change could be
implemented to reduce the exposures as follows:
      o Sense that the document is correctly inserted initially.
      o Continue to monitor the sensor as the document is ad vanced.
      o If a hole is detected (which would change the sensor status),
then continue to feed the document for a few motor steps while
watching to see if the document blocks the sensor again.
           - If the sensor s...