Browse Prior Art Database

Method for Modifying Print Positions in a Serial Printer

IP.com Disclosure Number: IPCOM000045853D
Original Publication Date: 1983-Apr-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Kajisa, K: AUTHOR [+3]

Abstract

It is most important that serial line printers should be adjusted to obtain a specified print position, typically the first print position, relative to the left edge of the print form after being assembled, because a small error in the print position due to cumulative mechanical assembly tolerance is inevitable.

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Method for Modifying Print Positions in a Serial Printer

It is most important that serial line printers should be adjusted to obtain a specified print position, typically the first print position, relative to the left edge of the print form after being assembled, because a small error in the print position due to cumulative mechanical assembly tolerance is inevitable.

In the prior method, the first print position is adjusted mechanically. Such a method has a defect in that it requires several trials of printing, measuring the first print position relative to the left edge of a print form and adjusting (moving the print mechanism relative to the print form) manually. Thus, much time is consumed adjusting printers which require a tight tolerance for the first print position.

To remedy the above defect, the following method is provided: First, a line of characters is printed for testing, and then, a difference between the correct or nominal first print position and the character position actually printed for the first print position is manually measured. Then, based on the measured difference, a value representative of an amount to be modified is set, in code, to four switches of the printer. The code is defined to represent a multiple of a reference value which is based on the cycle time of a print trigger pulse and the moving speed of the print head, as follows: Code Modified Value (m,m)

0 0 0 0 -0.45

0 0 0 1 -0.30

0 0 1 0 -0.15

0 0 1 1 0

0 1 0 0 +0.15

0 1 0 1 +0....