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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.
English (United States)
This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately
90% of the total text.
Carrier Stop Mechanism
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
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.
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.
problem is more often observed when
loading partially-curled or thin
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.
positions are within 20mm from the
paper, so that the paper guide