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Wire Dot Alignment Suitable for Matrix Printhead of High Speed and Multi-Pel Printer

IP.com Disclosure Number: IPCOM000115292D
Original Publication Date: 1995-Apr-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 4 page(s) / 77K

Publishing Venue

IBM

Related People

Hanabuchi, Y: AUTHOR [+3]

Abstract

Disclosed is a method of aligning wire top of dot-matrix printhead considering firing sequence to decrease both current dissipation peak value and magnetic interference. This alignment is effective for serial printer which has several different printing mode of horizontal resolution. Especially, it is effective for high speed printer which is required to align the top of wires of its printhead as rounded-shape to shorten the wires avoiding the mechanical stress of the wires.

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This is the abbreviated version, containing approximately 52% of the total text.

Wire Dot Alignment Suitable for Matrix Printhead of High Speed and
Multi-Pel Printer

      Disclosed is a method of aligning wire top of dot-matrix
printhead considering firing sequence to decrease both current
dissipation peak value and magnetic interference.  This alignment is
effective for serial printer which has several different printing
mode of horizontal resolution.  Especially, it is effective for high
speed printer which is required to align the top of wires of its
printhead as rounded-shape to shorten the wires avoiding the
mechanical stress of the wires.

      With this method, the alignment can meet the following
conditions: (a) the wires of the printhead are fired at some
separated timing to avoid driving current concentration; and (b) some
neighboring wires are fired simultaneously to avoid magnetic
interference which typically happens when neighboring wires are fired
alternately; (c) both of above conditions should be kept even if the
horizontal print resolution is altered.

      The method of alignment follows: (1) divide all the wires into
some groups (i.e., four groups) of wires which aligns neighborly; (2)
set the horizontal spacing of each wires in the same group as a
common multiple of each horizontal print dot spacing (dot pitch) of
desired variable resolutions of the printer; (3) set the horizontal
spacing of each groups NOT as a common multiple of any dot pitch of
desired variable resolutions of the printer.

      Fig. 1 is a typical application of this method for 24-wire
printhead of a printer which has four print...