Browse Prior Art Database

Autolocation of Top-of-Form in a Printer

IP.com Disclosure Number: IPCOM000102292D
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Sinclair, DA: AUTHOR

Abstract

Users often incorrectly position fan-fold paper in printers. Disclosed is a method that allows a printer to locate the top of a form automatically regardless of where the top of the form is initially threaded. The method employs a specially positioned hole in each page. A simple method for the user to prepare his own paper stacks with holes is included.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 93% of the total text.

Autolocation of Top-of-Form in a Printer

       Users often incorrectly position fan-fold paper in
printers. Disclosed is a method that allows a printer to locate the
top of a form automatically regardless of where the top of the form
is initially threaded.  The method employs a specially positioned
hole in each page.  A simple method for the user to prepare his own
paper stacks with holes is included.

      An index mark 1 is made on every page of fan-fold printer paper
at the top of the form position.  The mark could be simply an extra
hole inline with a top tractor hole, as shown in Fig. 1.  A sensor,
such as an infrared diode and detector pair, is attached to the print
mechanism in the appropriate position in order to detect the marker
hole when the paper is at the top of the form position. Thus to find
the top of the form automatically, the printer can be programmed to
line-feed until the detector senses the first page hole.

      Such paper 2 can be specially produced by the manufacturer to a
published standard for high volume users or may be cut, as required
in stocks of standard fan-fold paper.  A simple mechanism, shown in
Fig.  2, to cut a small rectangular hole 3 as an index marker at an
appropriate position consists of a saw-toothed cutting wheel 4
rotating at the edges of the fan-fold stack, aligned horizontally to
cut into the stack edges at the position of the index hole detector.
The cut notch 5 so produced appears as a series of holes 3...