| 摘要 |
865,644. Copying-lathes; machine-tool details. ERNAULT-BATIGNOLLES, H. July 15, 1958 [July 23, 1957; Jan. 23, 1958], No. 22657/58. Class 83 (3). A copying-lathe, copy-milling machine or the like, comprises a carriage 104 movable parallel to the axis of a workpiece 145 and carrying a toolslide 141 movable towards the workpiece, and a templet-holder 155 rockable by a crank 157 about an axis parallel to the work-axis. The templet 152 is engaged by a feeler 144 actuating a valve 189 to control an hydraulic piston 187 attached to the tool-slide 141. If an electric power failure occurs, an electromagnet E1 allows a spring R2 to move the feeler 144 in the tool-withdrawing direction. An adjustable stop 191 limits the withdrawal movement of the tool by engaging a stop 192, and also engages a switch M1 controlling rapid-return of the saddle. The holder 155 is secured by a bolt 19 to the crank 157 in a position adjusted by a screw against a graduated scale. The crank is held by a spring against a fixed stop 159. The crank can be angularly-adjusted by adjustable stops 161 on a drum 162, indexed by a rack-and-pinion operated by hydraulic means 165, to swing the templet outwardly for taking roughing cuts. Oscillation of the crank 157 is damped by a dashpot 164. The saddle 104 is traversed on guides 102, 103 by a screw 113 or, for quick traverse, by an hydraulic piston 105. Indexed with the drum 162 is a disc carrying screws 177, which can be adjusted to vary the stroke of each traverse of the saddle which carries a stop 176. When the stop 176 engages a screw 177, a valve V3 and a switch M4 are actuated to index the drum 162 and to withdraw the tool. A disc (not shown), on a shaft 175 carries selector-means for skipping one or more of the roughing-cuts. The lead-screw 113, engaging a gear 114 in the carriage, is rotated from the lathe headstock drive by a shaft 121, driving through gearing which can be selected or locked by electromagnetic clutches EM1 to EM4. The gear 114 is normally locked to the saddle by a spring- operated clutch 116 and, for manual traverse of the saddle, it can be rotated by a hand-wheel 130. Traverse of the saddle rotates a control drum T2 by a quick-pitch screw 195. A second control-drum T1 is indexed with the disc 162. The drums carry dogs to control traverse speeds through the electromagnetic clutches EM1- EM4, and to control spindle rotation. To produce a rapid-return movement of the saddle, switches M7, M11 are actuated by dogs on the drums T1, T2 to energize electromagnets E2, E3. The magnet E2 releases the clutch 116, allowing the gear 114 to freewheel in engagement with the traverse-screw 113, and the magnet E3 moves the screw 113 a small distance axially to actuate a valve V2 and cause rapid movement of the piston 105. Specification 808,976 is referred to. |
