| 摘要 |
A drawing device which includes a frame movable over a marking surface by at least a pair of wheels fixedly secured to a shaft for rotation with the wheels. At least one marking member is mounted on the frame and movable relative thereto to draw a predetermined pattern onto the marking surface in response to movement of the frame over the marking surface. A cam drum, having a plurality of different, individual cam runs disposed longitudinally therealong, is secured to the rotating shaft and a linkage is operatively connected to the marking member, with a cam follower of the linkages engageable with the cam drum to move the marking member relative to the frame in a pattern determined by the individual cam runs on the cam drum. The cam follower portion of the linkage and the cam drum are relatively shiftable to thereby permit selective determination of the pattern to be drawn by the drawing device. The marking member is journaled on the frame for movement toward and away from the frame, as well as pivoting movement relative to the frame, to provide for further selective changes of the drawn pattern.
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