Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Print Head

IP.com Disclosure Number: IPCOM000099644D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Harahata, M: AUTHOR [+2]

Abstract

Disclosed is a structure of a circular leaf spring for a spring chargetype dot-matrix serial print head. This spring structure enables print heads to be of high speed, highly reliable and with low manufacturing cost.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Print Head

       Disclosed is a structure of a circular leaf spring for a
spring chargetype dot-matrix serial print head.  This spring
structure enables print heads to be of high speed, highly reliable
and with low manufacturing cost.

      The unique feature of this spring structure is a ring part on a
spring disk between slits and clamping edge, as shown in Fig. 1.
Because of this ring's strength, the inner diameter of the ring works
as a fulcrum of the leaf springs. As shown in Fig. 2. by the fulcrum
shifting from the clamping edge to the ring inner diameter, inertia
moment of the hammer assembly on the leaf spring is reduced and,
consequently, repetition frequency of the spring is higher than that
of the prior print head.

      Fretting corrosions on the clamping edge can be prevented with
this structure also.  Because the clamping edge and the spring
fulcrum are separated by the ring, vibration on the leaf springs does
not affect the clamping edge, and fretting corrosions are prevented.