| 摘要 |
An anti-fold apparatus for high speed printers to prevent the folding or creasing of a printer ribbon riding over rollers. The rollers each have spiral angular serrations thereon, and are mounted in two pairs with each roller in a pair having one end abutting the end of the other, and each being mounted at an angle to the elongated center axis of the other, so that a printer ribbon rolling thereon is directed away from the abutting ends of each pair of rollers to prevent creasing therein. A linkage connects the two pairs of rollers at their abutting ends for shifting the angular position of each pair simultaneously between first slanted positions, when the ribbon is moving in one direction, and second slanted positions, when the ribbon is moving in the reverse direction. The linkage is actuated by solenoids, actuated by the reversing of the ribbon.
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