| 摘要 |
<p>A router jig for profiling the end of an elongate workpiece, and in particular a coping or crown moulding section, comprises a support for a sample whose profile is to be copied, and for a profiling comb in the form of an array of parallel plates held in contact with one another by retaining means such as rods extending between a pair of support blocks, each said plate being individually and reversibly slidable in one direction relative to the others and having a contact surface at one end thereof whereby the contact surfaces of adjacent plates can pushed against a sample in the support to define a cam surface corresponding to the profile to be copied and a movable mounting on which a cutting tool can be mounted to move and follow a path defined by the cam surface, by means of a cam follower pin or the like, to match the shape of the cam surface. Means are provided for locking the plates of the profiling comb against said sliding movement. The profiling comb is movable between a first position in which the contact surfaces of the plate face the sample support for the purpose of forming a profile from the surface of the sample and a second position in which a profile formed by the plates can contact the cam follower on the movable mounting. In its second position the profiling comb extends at an acute angle relative to the longitudinal direction of the workpiece support and the workpiece support is configured to support the workpiece at an acute angle about its longitudinal axis corresponding to the acute angle at which the profiling comb is fixed.</p> |
