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Browse Prior Art Database

Counterweighted Print Head Drive

IP.com Disclosure Number: IPCOM000045174D
Original Publication Date: 1983-Feb-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Blaskovic, SU: AUTHOR [+5]

Abstract

In a wire matrix printer having a massive print head which travels at a relatively high rate of speed, rapid turnarounds of the print head impart excessive vibrations to the entire printer to cause it to be inoperative.

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Counterweighted Print Head Drive

In a wire matrix printer having a massive print head which travels at a relatively high rate of speed, rapid turnarounds of the print head impart excessive vibrations to the entire printer to cause it to be inoperative.

Referring to the figure, the print head is affixed to and driven by a timing belt. Since the lower strand of the timing belt travels exactly the same speed as and in the opposite direction of the upper strand, a counterweight may be attached to the lower strand to balance the forces felt by the machine during the print head turnaround and thereby eliminate the vibrations. The counterweight and its associated clamp are constructed from die cast lead, sintered or cast steel, providing a compact, low-cost part. The counterweight is bushed with a low friction plastic bearing and is supported by a hexagon or square shaft at the counterweight center of gravity. The hexagon or square shaft prevents rotation of the counterweight. The timing belt is sandwiched between the clamp and the counterweight.

The hexagon or square shaft has two collars fastened to it by set screws which function as crash stops to prevent the print head from feeding the machine side plates. In the event that the print head somehow misses the turnaround signal, the counterweight will hit a crash stop, thereby preventing the print head from being damaged. The counterweight hexagon or square shaft serves as a structural member stiffening the side plates...