Energy absorbing print hammer bumper with internal stabilizer

Details Energy absorbing print hammer bumper with internal stabilizer Energy absorbing print hammer bumper with internal stabilizer

1974-12-18

1976-11-30

Burr, Edgar S.

Printing

Selective or progressive

Bed and platen machines

197 42, 335271, B41J 942

Patent

active

039942180

ABSTRACT:
An elongated energy absorbing bumper assembly, particularly adapted for use in absorbing the kinetic energy induced print hammer forces produced in impact printers and the like, is comprised of an outer resilient body portion, and an axially disposed stabilizing rod. The stabilizing rod is employed to substantially minimize the troublesome "kneading" or stretching effects that have otherwise often been encountered heretofore with conventional one-piece elongated bumpers made out of materials exhibiting the requisite resiliency and viscous damping characteristics. Such detrimental effects have developed heretofore both during the assembly of the bumper in the hammer mechanism, and during use thereafter. As a result of the stabilizing rod minimizing dimensional changes in the outer resilient body portion of the bumper assembly along its axial length, the energy absorbing (or damping) characteristics thereof will permanently remain substantially uniform therealong.
In an alternative embodiment, the stabilizing rod is of tubular construction and optionally allows a temperature controlled heater element to be axially disposed therewithin. Such a heated bumper assembly is particularly advantageous for use in printers, such as of the mobile type, that are often operated in environments wherein the temperature may vary over a considerably wide range.

REFERENCES:
patent: 837920 (1906-12-01), Felbel
patent: 2625100 (1953-01-01), Williams et al.
patent: 3292531 (1966-12-01), Mutz
patent: 3296958 (1967-01-01), Liepelt
patent: 3386376 (1968-06-01), Mutz et al.
patent: 3418929 (1968-12-01), Nelson
patent: 3670647 (1972-06-01), Funk et al.
patent: 3726213 (1973-04-01), Herbert
patent: 3791292 (1974-02-01), Soderstrom et al.
patent: 3823667 (1974-07-01), Babler
patent: 3826191 (1974-07-01), Pittis et al.

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