Patent GB-672452-A (GB)
Title: Die cutting machine
Inventor: COE GEORGE BERTRAM
IPC: B23Q1/54
Filed: 1950-05-17
Abstract: 672,452. Grinding. TUBE REDUCING CORPORATION. May 17, 1950, No. 12363/50. Class 60. [Also in Group XXII] A die-cutting machine for simultaneously shaping a pair of workpieces 20 to form a cooperating pair of dies, comprising a main shaft 32, a rotatable member 22 carrying a pair of spindles 21 to which the respective workpieces are attached, a grinding tool 23 mounted on a laterally-movable table 24 which carries a roller bearing against the face of a longitudinally movable cam, and a sun gear 50 and associated planetary pinions 49, 49<SP>1</SP> for turning the respective spindles is characterised by an auxiliary shaft 51 to which the sun gear is rigidly secured, a countershaft 54 operatively connected to the cam for imparting longitudinal movement thereto, gears 56, 58 freely mounted on the countershaft, pairs of pinions 43, 44 and 38, 39 freely mounted on the main shaft, the pinions 43, 39 being operatively connected to the member 22 and shaft 51 respectively and the pinions 44, 38 being operatively connected to the gears 56, 58 respectively, and slidable clutch members 40, 60 keyed to the shafts 32 and 54 respectively and connected to each other so as to be movable together along their respective shafts so that when the clutch. members are shifted to the right, the clutch member 40 is coupled to the pinion 43 and the clutch member 60 to the gear 56 to effect a tooling operation on the workpieces, and then to the left, the clutch member 40 is coupled to the pinion. 39 and the clutch member 60 to the gear 58, to effect a rapid return of the spindles and a rapid retraction of the cam to their respective starting positions. The clutch members are connected to shifter rings 41, 61 carried by brackets fixed to a slide 35 movable longitudinally by fluid pressure means and the slide has fixed thereto a stationary clutch member 36 within which the main shaft is freely rotatable. The cam is mounted on a slide 30' to which is screwthreaded a shaft 75 having fast thereon a gear cluster 76 which is operatively connected, by means of a tumbler gear 77, to a long-faced pinion 78 fast on the countershaft. The planetary pinions are connected by means of toothed gearing to the upper end of one work spindle and to the lower end of the other, work spindle. The member 22 is provided with an opening 85 for loading and unloading the workpieces and for measuring and inspection purposes. The tool may be driven by an auxiliary motor mounted on the table 24. The latter and its associated slides are mounted on a bracket 86 which is pivotally supported so that it can be swung away from the opening 85. The member 22 is enclosed by a casing having a removable cover. The spindles 21 are journalled in slidable frames which are adjustably secured to removable covers, on opposite sides of the member 22, by means of hollow screws which allow access to screws securing the workpieces to the spindles 21. Lubricant is supplied to the tool. The main shaft is driven by a reversible motor 31 which is stopped automatically when the spindles and workpieces have reached their starting positions, as well as at the end of a cutting operation, by means of adjustable fingers 30" on the cam-carrying slide 30' which engage and open switches in the motor circuit.