| 摘要 |
<p>A drawing apparatus comprising an assembly of a first member and a second member which are shaped in such a way and assembled in such a way that the assembly constitutes a self-indexing stencil. The first member has one or more shaped apertures therein and the assembly comprises one or more conjugated cam systems each including a multi-lobed cam shaped external surface and a multi-lobed cam shaped internal surface. The first member is a disc and the second member is a frame, the disc being movable relative to the stationery frame by means of a pen, pencil or the like tracing out the shape of the or an aperture in said disc, the disc when the pen, pencil or the like has completely traced out said shape being indexed one part of one revolution relative to the frame, the pen, pencil or the like simultaneously drawing or inscribing a design upon a surface supporting the apparatus.</p> |
