| 摘要 |
A plotter instrument for marking on a recording medium utilizes a rotatable pen carousel carrying a plurality of marking pen elements. A carriage drives the pen carousel into engagement with a cam track to produce rotation of the pen carousel and result in a change of the marking pen element in position for marking on the recording medium. The plotter instrument further includes drive rollers on a first driven shaft and pinch rollers on a second shaft, which shafts extend between opposing end plates. The drive rollers and pinch rollers are engagable with the recording medium for providing displacement thereof. Relative positioning of the drive and pinch rollers is provided by a pinch roller shaft cap eccentrically placed on each end of the second shaft. Each shaft cap is of a multi-sided, regular polygon configuration and insertable in a respective end plate opening. The orientation at which the cap is inserted determines the relative spacing between the drive rollers and the pinch rollers.
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