| 摘要 |
<p>A sheet indexing drive roller (10) has knurled drive portions (32, 34) on its opposite ends that are formed with spaced teeth (36) which partially penetrate into the sheet (22) being driven to form indentations. The teeth (36) are tapered and self centering so that when driving the paper (22) in reverse and forward direction the sheet (22) will be indexed as the teeth (36) slide into previously made indentation. As shown the teeth (36) are sharp pointed pyramidal shaped projections that are spaced apart a desired distance, and which have a vertical height (40) that is selected to be less than the thickness of the sheet (22) to prevent the points of the teeth (36) from piercing the side of the paper (22) that is being printed. The drive roller (10) finds an application in a wide variety of paper feed drives, and in particular is useful for driving sheets (22) that are to have labels printed on one side, and then cut into individual labels.</p> |
