Browse Prior Art Database

Variable Print Impression Control

IP.com Disclosure Number: IPCOM000086659D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Hall, DJ: AUTHOR

Abstract

Print impression can be controlled in an impact printer by providing an elastomeric material in the print hammer path to engage and absorb a portion of the hammer energy.

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Variable Print Impression Control

Print impression can be controlled in an impact printer by providing an elastomeric material in the print hammer path to engage and absorb a portion of the hammer energy.

Referring to Fig. 1, hammer 1 is driven in the direction of the arrow by an actuator 2 so that it engages type element 3, driving it into ribbon 4 paper 5 and against platen 6. The hammer has a flange 7 which engages and compresses elastomeric stop 8 supported on base 9. The stop and base are correspondingly tapered, and the stop is adjustable vertically to change the time at which the flange engages the stop. The print intensity can be varied by adjustment of the stop to a suitable interference position.

As an alternative, the stiffness of stop 8 may be varied instead of its interference position. As shown in Fig. 2, holes 10 of varying size may be formed in the material of the stop to alter its stiffness. Or as shown in Fig. 3, the configuration of opposing recesses 11 may be tapered to provide varying resilience. The stop elements of Figs. 2 and 3 may also be used in conjunction with the positioning arrangement shown in Fig. 1.

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