Browse Prior Art Database

TEMPERATURE COMPENSATING MEANS FOR ACTUATOR ARM ARM OF HAMMER DRIVER

IP.com Disclosure Number: IPCOM000023888D
Original Publication Date: 1979-Apr-30
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 377K

Publishing Venue

Xerox Disclosure Journal

Abstract

Hammer4ype impact printing mechanisms, such as shown in Figure 1, tend to display variations in energy level for printing between startup time (COLD) and a time period after the system has been operating for a period of time (HOT).

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XEROX DISCLOSURE JOURNAL

TEMPERATURE COMPENSATING MEANS ~TU ATOR ARM ATURE ARM OF HAMMER DRIVER
William C. Monday

Proposed Classification
U.S. CL 101/93,48

mt. CL B41j

~34~

39,40

PRIOR ART

A concept is disclosed for providing compensation energy level caused by the change in temperature mechanism versus operating time.

to the variations in printer of a portion of the printing

Hammer4ype impact printing mechanisms, such as shown in Figure 1, tend to display variations in energy level for printing between startup time (COLD) and a time period after the system has been operating for a period of time (HOT).

Referring to Figure 1, the hammer 14 is slidingly guided in a sleeve 31 for recip~ rocating movement toward and away from the recording medium (not shown). The hammer driver comprises an actuator or armature arm 34 which is pivotally mounted on support assembly 32 in position to propel the hammer 14 forwardly toward the recording medium in response to the energization of electro~magnet35. When an energizing current is applied to the electro~magnet35, the pole piece 39 is attracted to and brought into engagement with the magnetic poles 37 and 38. Repeated printing causes pole piece 39 to heat rapidly to a high temperature, which sets up a temperature gradient across (left and right as seen in Figure 1) the plastic actuator or armature arm 34. This temperature gradient causes the plastic

FIG. 2

Volume 4 Number 2 March/April 1979 151

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