Browse Prior Art Database

Stoke Stabilizing Mechanism for Stored Energy Print Head

IP.com Disclosure Number: IPCOM000118432D
Original Publication Date: 1997-Feb-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 4 page(s) / 89K

Publishing Venue

IBM

Related People

Hinata, K: AUTHOR [+4]

Abstract

Disclosed is a simple Stoke stabilizing mechanism for the Stored Energy Print Head, which consists of a single ring made of low thermal expansion soft magnetic material, such as Invar.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Stoke Stabilizing Mechanism for Stored Energy Print Head

      Disclosed is a simple Stoke stabilizing mechanism for the
Stored Energy Print Head, which consists of a single ring made of low
thermal expansion soft magnetic material, such as Invar.

      Fig. 1 shows an application sample for a Print Head whose
permanent magnet is made of low-cost NdFe.  Since the NdFe magnet
coercive force decreases according to temperature rise, the magnetic
retaining force of the Armature decreases and the stroke increases.
In order to stabilize the stroke, Invar ring 1 is inserted between
NdFe Permanent magnet 2 and Yoke 3.  Invar ring 1, Permanent magnet
and Yoke expands according to temperature rise, but the Invar ring
has a lower thermal expansion than the Permanent magnet and Yoke.
Consequently, the Yoke moves toward Armature 4 and decreases the
deformation force of Spring 5.  This spring force decrease is
proportional to the Invar ring thickness.  Accordingly, by selecting
Invar ring thickness so that the magnetic retaining force decreases
and the Spring deformation force decrease are balanced, the Print
stroke is stable from low temperature to high temperature.

      On the contrary, when the magnet is made of high-grade
material such as SmCo5 or Sm2Co17, its coercive force decrease is not
large.  However, Cancel coil-5 resistance increases according to
temperature, cancel current decreases and causes stroke decrease.
Fig. 2 shows the application sample for this kind of Print Head.
Yoke 6 is divided into two pieces (61 and 62), and bet...