GB874948A - Improvements in and relating to distributing devices for workpieces - Google Patents

Abstract

874,948. Blanks transferring in metalworking presses. SOC. ORNANAISE DE CONSTRUCTIONS MECANIQUES. Nov. 27, 1958 [Nov. 30, 1957; Aug. 13, 1958], No. 38280/58. Class 83 (4). A distributing device for a power press incorporating oscillating mechanism with gripping means for picking up workpieces at a point remote from the press and transferring them to the tools, said oscillating mechanism comprising a distributer plate controlling the horizontal movements of the gripping means through means such as a sleeve and connecting rod and the vertical movements through means such as a cam and lever is characterized in that a cylinder unit is provided to control the oscillatory movement of the distributer plate, the piston-rod of said cylinder unit co-operating with a pin fixed to said distributer plate. The device comprises gripping means, e.g. pincers 43, controlled for vertical movement by a lever 30 and horizontal movement by a connecting rod 21 controlled by a distributing plate 1 which is oscillated about its axis by a pivoted fluid-pressure cylinder 2, controlled by a pilot valve 5, a distributer unit 4 and a control valve 51. The pilot valve 5 is operated by abutments 7 on the distributing plate 1 and the control valve 51 allows or interrupts the passage of fluid from the pilot valve 5, to the distributer unit 4. The opening and closing of the gripping means 43 is effected by a valve 9 controlled by a cam 9 2 moving between abutments 9 3 and 9 4 under the action of cams 6 1 and 6 2 on the distributing plate 1. The opening and closing is effected by cams 6 1 and 6 2 respectively. The movement of the gripping means is shown in Fig. 9. The gripping means are rigid with a plate 39 on a vertically movable spring-loaded part 27 mounted on the frame 33, the verticalmovement being effected by the lever 30 which is adjustably connected to the plate 39 at one end. and has a roller at the other end co-operating with cams 8 on the distributing plate 1. The horizontal movement of the gripping means is'effected by the rod 21 adjustably fixed at one end to a stirrup piece 18 fixed to a pivot-pin 22 on the distributing plate and at the other end through a stirrup piece 23 to the plate 39 which is fixed to the gripping means. A damping device 37 is incorporated in the rod 21. Abutments 29 1 and 29 2 acting on the plate 39 limit the horizontal movement of the gripping means. The plate 39 is provided with cams 13 which act on a valve 12 and a control cylinder 10 to operate the starting lever 11 of the machine. The device also includes means 49 and 50 for blowing and ejecting workpieces, said means being operated by a control plate 46 (Fig. 8), mounted on the crank-shaft of the press and having cams 46 1 and 46 2 for operating the control valves of the blowing and ejecting means. In a modification the distributer is provided with a control cylinder 2 (Fig. 12), attached to a rack 61 co-operating with a pinion 60 fixed to the distributing plate 1. An L-shaped guide-piece 71 fixed to the distributing plate axis guides and supports the rack 61. An hydraulic braking device is incorporated in the control cylinder 2. Operation of distributer.-When the valve 14 is opened fluid pressure is admitted to the pilot valve 5, the electro valve 54, the distributer unit 4 and the valve 9 which ensures the opening and closing of the gripping means. The movement of the piston 22 in cylinder 2 oscillates the distributing plate 1 to move the gripping means vertically and horizontally, controls the movements of the slide 91 and consequently controls the starting or stopping of the machine by displacing the starting lever 11 under the action of the piston-rod of the cylinder 10 which is controlled by an electrovalve 54. A contact 90 is mounted in series with a fluid pressure-operated contact 96 connected to the pressure fluid supply line to the grippers 43. When the grippers are supplied with fluid the contact 96 closes. To avoid blowing on each stroke of the cam 9 2 the supply of pressure fluid is interrupted every other time by the distributer 4. When the contacts 90 and 96 are made fluid pressure is admitted to cylinder 10 to start the machine. The cam 9 2 co-operating both with the blower 95 and the contact 90 ensures the stoppage of the machine and the ejection of the machined workpiece.