34 flatbed plotter i a flatbed plotter plots a design

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Unformatted text preview: d graphic output on large sheets. The various types of printers discussed above are, not suitable for meeting this output requirement of such applications. A special type of output device called plotters is used for this purpose. Plotters are an ideal output device for architects, engineers, city planners, and others who need to routinely generate high-precision, hard-copy graphic output of widely varying sizes. The two commonly used types of plotters are drum plotter and flatbed plotter. They are briefly described below. Drum Plotter In a drum plotter, the paper on which the design has to be made is placed over a drum that can rotate in both clockwise and anti-clockwise directions to produce vertical motion. The mechanism also consists of one or more pen holders mounted perpendicular to the drum's surface. The pen(s) clamped in the holder(s) can move left to right or right to left to produce horizontal motion. The movements of the drum and the pen(s) are controlled by the graph plotting program. That is, under computer control, the drurn and the pen(s) move simultaneously to draw the designs and graphs on the sheet placed on the drum. The plotter can also annotate the designs and graphs so drawn by using the pen to draw characters of various sizes. Since each pen is program selectable, pens having ink of different colors can be mounted in different holders to produce multi-colored designs. A drum plotter is shown in Figure 9.34. Flatbed Plotter I A flatbed plotter plots a design or graph on a sheet of paper that is spread and fixed over a rectangular flatbed table. In this type of plotter, normally the paper does not move and the pen holding mechanism is designed to provide all types of motions necessary to draw complex designs and graphs. That is, under computer control, the pen(s) move in the required manner to draw the designs and graphs on the sheet placed on the flatbed table. The plotter can also annotate the designs and graphs so drawn by using the pen to draw characters of various sizes. Here also provision is there to mount mor...
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This document was uploaded on 04/07/2014.

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