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A bumper which acts as a rebound damper and backstop for a print hammer has a construction which automatically compensates for dimensional changes induced by thermal effects on the damping material.
English (United States)
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Thermal Compensating Bumper
A bumper which acts as a rebound damper and backstop for a print hammer
has a construction which automatically compensates for dimensional changes
induced by thermal effects on the damping material.
As shown, a backstop 10 comprises bumper 11 attached to rigid member 12.
Bumper 11 consists of stem 13 with small button 14 and large button 15 attached
to each end. Stem 13 is sized to move freely in clearance hole 16. Small button
14 holds polyurethane pad 17 with striking surface 18. A relatively thin
polyurethane washer 19 is located between small button 14 and rigid member 12. A relatively thicker polyurethane washer 20 is similarly located between large
button 15 and rigid member 12. During temperature increases, the expansion
force of washer 20 will be greater than the expansion force of washer 19 thereby
producing a net expansive force which results in a displacement of stem 13 to
the right thereby compensating for the expansion of pad 17 and its leftward
displacement of striking surface 18. A preloading force should be exerted on the
washers so that compensation occurs for decreasing temperatures. Stem 13
may have one end threaded to receive a button for preloading the washers.