Print hammer bumper exhibiting dual resiliency characteristics

Details Print hammer bumper exhibiting dual resiliency characteristics Print hammer bumper exhibiting dual resiliency characteristics

F - Mech Eng,Light,Heat,Weapons

04

C

101/94

F04C 2/30 (2006.01) B41J 9/26 (2006.01) B41J 9/42 (2006.01) F04C 2/46 (2006.01)

Patent

CA 1086565

PRINT HAMMER BUMPER EXHIBITING DUAL RESILIENCY CHARACTERISTICS ABSTRACT A print hammer bumper for an on-the-fly impact printer which includes a hammer mechanism having a plurality of print hammers disposed in a linear array. The bumper serves to automatically adjust the forward force of the hammer to the number of paper plys being printed and to dampen the rebound energy of the hammer return stroke. The bumper is in the form of an elongated material having two portions each exhibiting different characteristics. A first portion of the bumper, which is positioned to engage each of the print hammers during their forward printing stroke, exhibits a hardness characteristic such that it readily compresses to adjust the printing force to the number of paper plys being printed. A second portion of the bumper exhibits a low resiliency characteristic and is positioned to engage the hammers upon their return or rebound stroke so as to absorb the hammer rebound energy, thus preventing character overprint by a rebounding hammer again striking the paper. -1-

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