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Magnetic Circuit Adjustment Method in Modular Core Structure Type Printhead

IP.com Disclosure Number: IPCOM000105737D
Original Publication Date: 1993-Sep-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 4 page(s) / 61K

Publishing Venue

IBM

Related People

Doi, N: AUTHOR [+3]

Abstract

This article describes a polar magnetic flux adjustment method in a modular core structure-type printhead which has an independent magnetic circuit at each pole in the core assembly. This method enables the printhead assembly to adjust functional properties and to change the print speed without changing the core assembly components.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 78% of the total text.

Magnetic Circuit Adjustment Method in Modular Core Structure Type Printhead

      This article describes a polar magnetic flux adjustment method
in a modular core structure-type printhead which has an independent
magnetic circuit at each pole in the core assembly.  This method
enables the printhead assembly to adjust functional properties and to
change the print speed without changing the core assembly components.

      Fig. 1 shows the magnetic flux path at the pole.  Schematic A
in Fig. 1 shows a flux path at the original magnetic pole, and
schematic B shows a flux path when each stator plate 1 is bridged by
metal block 2 made of a magnetic substance.  By shorting the magnetic
circuit by the metal block, magnetic flux 3 which flows into armature
4 is changed.  By changing the thickness of metal block 2, the
magnetic flux 3 can be controlled.  Fig. 2 shows a magnetic pulling
force 1 at the pole and a spring force 2 of the printhead.  A
magnetic pulling force 1 is decreased due to the block, hence it has
the same effect as demagnetizing a magnet at the pole and it is
possible to adjust the functional properties of the printhead by
changing the magnetic resistance of the metal block, e.g., its
thickness.  Furthermore, print speed can be adjusted by using a thin
spring which has lower spring force 3.

      Fig.3 shows five examples of a metal block shape and how to fix
it in the printhead assembly.

      Schematic (A):  A block (1-A) is inserted in...