| 摘要 |
<p>The invention relates to a machine and process for manufacturing cylindrical tenons used for correcting black loose knots in the sawn timber. The claimed machine comprises a milling unit, a cutting unit having a circular saw blade and a structure for guiding, clamping and feeding, the milling unit comprising a frame (2), an electric motor (3) for driving a wood milling cutter (4), a driving shaft (6), a pneumatic cylinder (7) for moving the milling unit towards and from a long cylindrical wooden rod (9) made of a branch of a tree from the same species of wood with the sawn timber to be corrected, the cutting unit comprising an electric motor (10), a feeding system (11 and 12) and a circular saw blade (13), the structure for guiding, clamping and feeding comprising an arm (14) tiltingly fixed on a bearing (15) and moved with a rod (16) of a piston placed in a pneumatic cylinder (17), some tongs formed in their turn of some dies (18 and 19), namely a fixed one and a mobile one, actuated by the piston of another pneumatic cylinder (20), a mechanical stop (21) and a screw (22) for adjusting the position thereof. The claimed process consists of an automatic processing cycle formed of five successive steps which consists in starting the machine, clamping the cylindrical rod (9), face milling the cylindrical rod (9) by means of the milling cutter (4) which also carries out the chamfering of the edges of the tenon (1) at an angle of 45°, moving pneumatically the cylindrical rod (9) towards the circular saw blade (13) in order to cut the tenon (1) and automatically-gravitationally feeding the cylindrical rod (9) in order to perform a new machining cycle.</p> |
