Browse Prior Art Database

Carrier Stop Mechanism

IP.com Disclosure Number: IPCOM000117976D
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Hada, T: AUTHOR [+3]

Abstract

Disclosed is a method which controls the positioning of the printing head carrier by using an optical sensor to eliminate the risk of "dog ear" on the passbook printer.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 90% of the total text.

Carrier Stop Mechanism

      Disclosed is a method which controls the positioning of the
printing head carrier by using an optical sensor to eliminate the
risk of "dog ear" on the passbook printer.

      Fig. 1 shows an example of this device.  The printing head
carrier (1) on the passbook printer has the printing head gap roller
(2) and the paper guide (3).  The printing head gap roller runs on
papers bi-directionally to print and the paper guide helps the paper
to load between the platen (4) and the roller.  For paper feed, the
printer head  gap roller sidesteps on either right or left.

      The right positioning of the roller when sidestepping is a key
issue.  Traditionally, on many passbook printers, the printing head
gap roller sometimes overruns to the point where the paper is
completely away from the printing head and the paper guide is no
longer effective,  which eventually causes a "dog ear" problem.  This
problem is more often  observed when loading partially-curled or thin
papers.

      The M/T 9068 passbook printer shown in Fig. 2 detects the
positions of both edges of the paper by scanning left-to-right before
printing with the optical sensor (5) attached to the printing head
carrier.  Based on the information, the printer sets the positions
where the head carrier sidesteps at both ends.  Currently, the
positions are  within 20mm from the paper, so that the paper guide
function works.

      Given the great advantage of this n...