| 摘要 |
1,035,197. Machine tool details. D. T. N. WILLIAMSON, and MOLINS ORGANISATION Ltd. July 26, 1963 [July 27, 1962; April 26, 1963], Nos. 28962/62 and 16544/63. Headings B3B and B3K. A method of locating a cutting tool T in numerically-controlled machine tool (e.g. by punched or magnetic tape) consists in releasing the grip on the tool within a chuck, moving the tool against a reference surface 118 and then reclamping the tool. Two tools 107, T are carried on a slide 102 movable on a slide 105. Two workpieces are carried on a vertically-movable slide 113 which also carries two reference pads 117, 118 and a tool storage rack 114. Axial play of the spindle 3, Fig. 3, is prevented by springs 9 between a collar 7 and a bearing 5. Oil-mist lubrication is supplied through passages 15, 16, 30. The spindle is rotated by a Pelton wheel driven by an oil jet. The rack 114 contains spring-pressed plastic holders which have thin-walled extensions to grip the cutting-ends of the stored tools. A plastic cover extending over all the tools is lifted when the slide 113 is lowered for tool-changing. In operation, each spindle 2, 109 (only one of which is subsequently referred to) moves to lie opposite a required tool as the slide 113 is lowered. Pressure is admitted to passages 68, 67 and a cylinder 60 moves forwardly to abut a collar 26; the pressure is then sufficient to overcome the force of a spring 73 so that a piston 54 then moves rearwardly. During the movement of the piston 54, pins 57 on the piston engage a ring 61 and carry back a rod 52 and a piston 49. Withdrawal of the piston 49 releases a conicallyended collet 36 and allows a split sleeve 39 to expand. The spindle is next advanced to pick up a tool, the advance being determined by a tape instruction. The spindle 3 is rotated slowly until a projection 43 in the end of the tool engages a recess in a spring-pressed plunger 44. The tool is then clamped by admitting pressure behind the piston 54 to release the rod 52 and allow springs 51 to close the collet 36. The slide 106 is then withdrawn, the slide 113 is raised, the slide 105 is moved sideways and the slide 106 again advanced. As the slide advances, the tool is unclamped and engages the reference pad 118. The slide stops at a tape-determined position. As the tool has been moved into the chuck, the rod 52 has moved a rod 76 to move arms 78 around a pivot 79. If the correct tool has been selected, one of two switches 80 is actuated: if a toolong or too-short tool has been selected, neither, or both, of the switches 80 are actuated and the machine stops. In a modification, the slide 113 is replaced by a rotary table, the cutter head can be swivelled, and only one tool is provided. The first Provisional Specification describes also a holster secured by a bayonet joint and carrying a spring-fingered toolholder, a bellows-shaped chuck and a toolejector. |
