Pen turret rotation for plotters

Details Pen turret rotation for plotters Pen turret rotation for plotters

G - Physics

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D

234/25

G01D 9/30 (2006.01) B43L 13/02 (2006.01) F16H 1/16 (2006.01) F16H 21/44 (2006.01) G01D 9/40 (2006.01)

Patent

CA 1263851

PEN TURRET ROTATION FOR PLOTTERS ABSTRACT OF THE DISCLOSURE In a plotter (10) having a plurality of pens (14) stored in a rotatable turret (16) for selective use in a plotting operation, the turret may be rotated by the drive motor (32) used to move the paper (12) bidirectionally, thereby eliminating the cost and weight associated with a pen turret drive motor. The rotation of the turret is mechanically coupled to a grit wheel shaft (34), which is used to move the paper and which is driven by the paper drive motor. The turret is positioned on a spindle (86) provided with slots (88) associated with the location of the pens. The bottom of the spindle is provided with a worm gear (110), which is continuously engaged by a worm (94) mounted on one end of a worm shaft (96). The grit wheel shaft is also provided with a gear (104), which is selectively engagable by a sliding gear (102) mounted on the other end of the worm shaft. A lever engager (98) is actuated by a foot (106) on the bottom of the carriage assembly (56) which supports a pen during the plotting operation. Upon actuation by the foot, the lever engager causes the sliding gear to engage the grit wheel shaft gear, thereby coupling rotation of the grit wheel shaft to the spindle. A spring (112) on the worm shaft returns the sliding gear to its disengaged position. The lever en- gager includes a walking stop (100) to engage the prese- lected slot in the spindle to provide appropriate orienta- tion of the turret for removal or replacement of a pen therein.

542287

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