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Print Mechanism

IP.com Disclosure Number: IPCOM000052454D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Hoekstra, JP: AUTHOR

Abstract

A print mechanism is shown in the drawing for impact inking of a paper surface. The mechanism includes a print hammer element 1 which is fixed at its left end. Print hammer 1 is raised up by the action of one of the four cams on rotating drum 2, thereby resulting in a downward tension on hammer 1. At the same time, an inner leaf section 3 of print hammer 1 is brought between a pair of outer leaves 4 of an electrostatic clamp. The two outer leaves 4 are stationary and in close proximity to inner leaf 3, such that the application of a suitable voltage to the electrostatic clamp will prevent the inner leaf 3 from being pulled downward by the spring tension of the print hammer element 1, and the print hammer is therefore cocked.

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Print Mechanism

A print mechanism is shown in the drawing for impact inking of a paper surface. The mechanism includes a print hammer element 1 which is fixed at its left end. Print hammer 1 is raised up by the action of one of the four cams on rotating drum 2, thereby resulting in a downward tension on hammer 1. At the same time, an inner leaf section 3 of print hammer 1 is brought between a pair of outer leaves 4 of an electrostatic clamp. The two outer leaves 4 are stationary and in close proximity to inner leaf 3, such that the application of a suitable voltage to the electrostatic clamp will prevent the inner leaf 3 from being pulled downward by the spring tension of the print hammer element 1, and the print hammer is therefore cocked.

When the electrostatic clamp leaves 4 are deactivated, inner leaf 3 is released and the downward spring action of the print hammer 1 will cause the right end of the print hammer 1 to strike or impact the surface of a paper located below the print hammer 1.

When direct inking is used, an ink applier 5 is provided within the right end of the ink hammer 1. Ink applier 5 is fed from a common ink reservoir (not shown).

Although only one print hammer is shown in the drawing, a large number of such hammers may be provided to effect a mechanism which offers high packing density, consumes little power, is inexpensive to manufacture, has one moving part and is applicable for impact printing, ribbonless printing and in-line printing.

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