| 摘要 |
<p>A machine for routing end portions of frame pieces (F) produces a channel that extends with increasing spacing from the bevelled face of the frame piece. Structure (12) on the machine supports the frame piece (F) in a plane that converges toward the plane in which the router bit (64) lies, and cutting is carried out by effecting either curvilinear or rectilinear relative movement of the router and the frame piece or pieces (F). A frame for pictures and the like is assembled from pieces that are routed to have divergent channels in mutual communication. The divergent paths produce increasing levels of force upon the parallel engagement portions of the fastening peg as it is inserted more deeply into the common recess, and thereby generate increasing levels of compressive force across the joint between the frame pieces.</p> |
