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Structure of Stored Energy Type Printhead

IP.com Disclosure Number: IPCOM000116746D
Original Publication Date: 1995-Oct-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Hikai, S: AUTHOR [+3]

Abstract

Disclosed is a structure of sub-yoke and armature for stored energy printhead. This structure enables printhead to be low power consumption and high throughput. This structure has a trapezoid armature and taperedk sub-yoke to obtain variable gap between an armature and a sub-yoke according to armature movement.

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Structure of Stored Energy Type Printhead

      Disclosed is a structure of sub-yoke and armature for stored
energy printhead.  This structure enables printhead to be low power
consumption and high throughput.  This structure has a trapezoid
armature and taperedk sub-yoke to obtain variable gap between an
armature and a sub-yoke according to armature movement.

      In Fig. 1, a magnetic circuit consists of a core 7, a permanent
magnet 6 a yoke 5, sub-yoke 4 and an armature 2.  This is
accomplished by attracting a spring 3 to the pole of the permanent
magnet 6.  The spring 3 is released by using a bucking coil 1 to
counteract the flux of the permanent magnet 6.

      When the armature 2 is settled on the pole, a gap 8 is minimum.
The gap 8 increases according to the armature 2 releasing from the
pole.  This means that the magnetic permeance is variable by the
armature displacement.

      Fig. 2 shows the relationship between magnetic force and
armature displacement.  In Fig. 2, line 1 is a spring force, line 2
is a magnetic force of flat(non-tapered) armature, and line 3 is a
magnetic force of trapezoid armature.  Line 3 means that the
trapezoid armature reduces an excess of magnetic force.  As the
result, this structure enables print head to be low power
consumption.