Patent GB-790884-A (GB)
Title: Multiple cut cutting machine
IPC: C14B1/22
Filed: 1956-02-16
Abstract: 790,884. Skiving-machines. FORTUNAWERKE SPEZIALMASCHINENFABRIK AKT.-GES. Feb. 16, 1956 [Feb. 16, 1955], No. 4866/56. Class 31 (1). In a skiving-machine of the cylindrical-cutter type in which the angle and height of a guide foot are adjustable in order to adjust the angle and depth of cut, a plurality of angle and height adjustment devices are provided in or on a continuously rotatable member in such a manner that, by rotation of the rotatable member, any of the adjustment devices can be brought into a position in which it controls the adjustment of the guide foot. As shown, a guide foot 7 provided with a guide cam 6 is adjustable in height by means of a spring-influenced guide rod 12, and a spring-influenced holder 11 for the guide foot is adjustable angularly relatively to a graduated circular ring segment 14 at the lower end of the guide rod 12 by means of a guide rod 19, the angular adjustment taking place about a centre which lies on the point of intersection of the guide cam 6 with an abutment edge 5 on the guide foot or on the holder 11. The upper ends of the guide rods 12, 19 engage respectively against guide rings 22, 24 the position of which is determined by slots in six control pins 25, 26, 27, 28, &c., arranged in pairs offset 120 degrees from each other in a rotatably-mounted drum 29. The positions of the control pins are determined by set screws, e.g. a set screw 31 determines the position of the pin 25 for heightwise adjustment of the guide foot and together with a set screw 34 determines the position of the pin 27 for angular adjustment of the guide foot. The set screws are adjustable by means of manually-operable box spanners 41, 42. The drum 29 is provided with two turning pins 49, 89 and a slightly longer guide pin 50 which are arranged so as to be opposite to the pairs of control pins. A gripper head 53 adapted to be reciprocated by a pedal-operated driving element 51 in the form of an hydraulic ram or electromagnet has pivotally mounted thereon two gripper arms 58, 59 provided with hooks 60, 61 either of which is adapted to engage the turning pins on the drum 29 to rotate the drum in a clockwise or counterclockwise direction. The gripper arms are also provided with guide pins 62, 63. The direction of rotation of the drum 29 is determined by a fork 67 pivotally mounted on the gripper head 53 and provided with prongs 83, 84 on which guide pins 68, 69 are arranged. The position of the fork 67 is determined by a reversing lever assembly 77 consisting of a handle 85, shaft 70 with grooves 71, 72, and reversing arm 73 carrying reversing pin 74 and cams 75, 76. When the gripper head 53 is reciprocated, the position of the gripper arms 58, 59 is controlled by two torsion springs 64, 65, the spring 64 which bears on the pins 62, 63 tending to spread the gripper arms apart, and the spring 65, which bears on the pins 62, 63, 68 and 69, tending to move the gripper arms towards each other. The spring 65 is stronger than the spring 64. The reversing lever 77 is shown as held in its upper position by means of a spring-influenced pin 79, Fig. 5, engaging the groove 72 and in one of its lateral positions by means of a spring-influenced pin 81 engaging the end 82 of the cam 76. To reverse the direction of rotation of the drum 29, the reversing lever is moved clockwise to the other lateral position in which the pin 81 engages the end 90 of the cam 75. By moving the reversing lever into its lower position in which the pin 29 engages the groove 71, the cams 75, 76 are brought into the path of travel of the elongated guide pin 50 so that the fork 67 is moved automatically from one to the other of its limit positions on reciprocation of the gripper head 53. The characters 92 for each cut are arranged on the drum 29 so as to be visible from outside through a window 91 in the machine casing.