Patterngraph apparatus

Claim 1

A patterngraph apparatus, comprising, in combination, a base, a first pin mounted upon said base, a drive wheel rotatably supported at its center on said pin, a turntable rotatably supported at its center, upon a second pin mounted upon said base, an annular groove around said drive wheel and around said turntable, an endless belt in both said grooves transmitting rotational movement therebetween, a plurality of upwardly projecting pins upon said turntable, a sheet of paper having a plurality of openings receiving said projecting pins for removable securement of said paper upon said turntable; an elongated arm having a longitudinally extending, irregularly curved slot being pivotally rocked about a screw stationarily mounted upon said base, said screw being received through said arm slot, an eccentrically mounted pin upon said drive wheel being also received through said arm slot, an "L"-shaped guide rod, a plurality of holes along said arm selectively receiving a bent-down end of said guide rod; a guide rod rest pivotally mounted upon said base, a row of notches upon said guide rod rest selectively supporting an opposite end of said guide rod, a guide rod plate supported on said guide rod, a pen-holding member extending transversely to said guide rod, being adjustably securable to said guide rod plate, and a pen upon an end of said pen-holding member for drawing a pattern upon said sheet of paper, when said drive wheel is rotated.