| 摘要 |
1,081,116. Shearing. W. SCHLœTER. April 15, 1965 [May 25, 1964], No. 16205/65. Heading B3W. [Also in Divisions B5 and H2] In a flying shear, punch or saw, the cutting tool is mounted on a carriage 28 which is reciprocated by an hydraulic piston and cylinder assembly 2, 3, 4. Pressure fluid is pumped into the cylinder 2 by a pump 5 which is driven from a machine 10 which produces the work 16. A by-pass pipe 21, 22 leads from thedelivery pipe 20 of the pump 5 to a sump 8. The by-pass circuit can be closed by a valve 12 attached to an end stop 11 which is engaged by the leading end of the work and closes the valve against the pressure of a spring 23. Movement of the valve 12 within the body 13 controls the flow of fluid to the cylinder 2 and hence the speed of the carriageso that it corresponds with the speed of the work. The return stroke of the carriage is effected by fluid from a pump 6 driven by a motor 9. In a modification, Fig. 3 (not shown), the work (16) drives a roller (29) which drives an infinitely variable gear (31). The output shaft (32) of the gear carries a pair of carbon brushes (34) which rotate around a stationary commutator (35). The setting of the infinitely variable gear is controlled by a stop (11), connected to a regulating member (36) operating a lever (37). As the stop (11) is engaged by the work (16) the shaft (32) begins to rotate and drives the brushes (34). The commutator (35) is connected to a fixed pole electric motor (39) which drives the carriage (1) through a rack-and-pinion gear (40, 41) at a speed determined by the extent to which the stop (11) has been moved relative to its casing (13). |
