| 摘要 |
A low cost line printer character chain lubricating device that provides an accurate amount of lubricant between a line printer character chain and the hard, smooth support surface about which the chain rotates. The lubricating device is located in a depression in the hard, smooth support surface and includes a piece of flexible, abrasion-resistant, microporous nitrile rubber that is impregnated with lubricating oil. The nitrile rubber has a smooth convex arcuate surface for contacting the character chain. A bracket semipermanently mounts the nitrile rubber in the depression in the support surface such that the convex arcuate surface of the nitrile rubber contacts the side of the character chain that normally contacts the hard, smooth support surface as the chain rotates. Depressions in the nitrile rubber beside the arcuate surface serve as charging reservoirs for the lubricating oil. As the line printer character chain rotates and contacts the arcuate surface of the nitrile rubber, the lubricating device provides oil on a need only basis such that an accurate amount of oil is automatically maintained between the chain and the hard, smooth support surface. The size of the micropores in the nitrile rubber, in relation to the lubricating oil used, controls the desired level of lubrication.
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