Improvements in Pantographic Apparatus for Producing Copies of Sculptures, Carvings, Carved Figures, Ornamentations and other Devices in Stone, Wood or other Material.

摘要

13,640. Denny, F. July 30. Pantographs.-Relates to pantographic apparatus for producing to scale copies of sculptures, carvings, and solid ornamental work generally. Within a frame A, B, C, D, a rectangular frame E', E2 is mounted to turn about an axis G. On the frame are mounted two pairs of racks H1, H2 and J1, J2. These racks are moved simultaneously in opposite directions by a hand-wheel and spur gearing I1, I2. One rack carries a balance weight L, while the other carries a shaft x, upon the end of which the cutting or shaping tool is fixed. A tracing bar or shaft y is connected to the shaft x, and also to the shaft G by a pantograph linkage, so that, as the shaft x is moved to and from the shaft G, the shaft y has a corresponding motion on a reduced scale. The motion of the shafts x and y in the direction of their lengths is effected by means of a slotted arm e pivoted to the shaft G and engaging with the arms x and y. When this arm is rotated by a treadle acting through a rope, the tracer and cutting-arm are forced against the work, and the motion takes place in the same ratio as that due to the pantograph. When a bust, say, has to be copied, it is placed on a stand opposite to the end of the tracing- shaft y. A block of stone is similarly placed opposite the end of the cutting-shaft x, which is fitted with a drill driven by a flexible shaft. Then the bar e is rotated until the end of the shaft y comes in contact with a point on the bust being copied. During this time the drill on the shaft x enters the block of stone to a corresponding depth. By the operation of the gear I2, or the rotation of the frame E1, E2, the shaft y is brought opposite a second point, and the operation repeated. When the work has to be reproduced on practically the same scale, the shafts x and y are too close to allow of the necessary space for the bust &c. In that case, therefore, the motion of the shaft x is transmitted to a second shaft fitted in a horizontal frame M1, M2, which slides on an upright P. For undercutting work, the drill &c. is mounted on the end of the shaft x at the necessary angle, and a corresponding tracer is fitted to the shaft y. In this arrangement, the simultaneous adjustment of the cutting-drill and the tracing-point about the respective axes of the shafts x and y is effected by chain gearing.