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Print Impression Control Device

IP.com Disclosure Number: IPCOM000086013D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Drejza, JE: AUTHOR

Abstract

Different impact energies for type elements can be obtained from a constant energy print hammer. This is done by varying the thickness of the type elements in accordance with the character area thereon, and positioning a resilient stop in the hammer flight path which is capable of absorbing hammer energy in proportion to the distance traveled.

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Print Impression Control Device

Different impact energies for type elements can be obtained from a constant energy print hammer. This is done by varying the thickness of the type elements in accordance with the character area thereon, and positioning a resilient stop in the hammer flight path which is capable of absorbing hammer energy in proportion to the distance traveled.

Referring to Fig. 1, a print wheel 1 having a plurality of type fingers 2 with type elements 3 thereon is rotatable through a print position between hammer 4 and ribbon 5, to record a character on document 6 against platen 7. The hammer 4 is driven toward the type element 3 by a hammer actuator 8. The hammer is supported on a pair of springs 9 for parallel motion toward type element 3. Hammer 4 is cut out to accommodate a mounting bar 10 having a resilient pad or stop 11 to be impacted during hammer travel by surface 12.

Each type element 3 of the wheel 1 has a thickness T which is in proportion to the area of the character 13 carried thereby. In other words, for characters of a large area, such as an M or W, the thickness T will be the greatest while for characters of small areas, such as a comma or period, the thickness will be a minimum.

Referring to Figs. 2A and 2B, it will be seen that when the hammer 4 is driven to the left, and there is a character of large area (thick type element), the interference face 12 of the hammer 4 compresses resilient pad 11 very little; only a small amount o...