Patent EA-003289-B1 (EA)
Title: Device for producing a lifting and lowering movement
Inventor: STOCKLE STEFAN
IPC: B21D43/05
Filed: 2000-06-30
Abstract: 1. A device for producing a lifting and lowering movement for lifting and lowering the cross transfer tongs of a forming machine, comprising a movable cam support (1) on which a control cam (2), a counter cam (3) and a spring element cam (4) are mounted, a rotationally mounted double lever (5) has a control roller arm (52), a counter roller arm (53) and an output arm (51), a control roller (54) that rolls out on the control cam (2) is rotationally mounted on the control roller arm (52) and a counter roller (55) that rolls out on the counter cam (3) is rotationally mounted on the counter roller arm (53), the control cam (2) and the counter cam (3) act on the double lever (5) in opposite directions of rotation, characterized in that a spring element roller (62) is located on a spring element lever (6) rolls out on the spring element cam (4) a spring element (61) is located on the spring element lever (6), and acts on the double lever (5) in the same direction of rotation as the counter roller (55). 2. The device according to claim 1, characterized in that the spring element cam (4) is arranged on the rotating control shaft (1) and the double lever (5) and the spring element lever (6) are preferably rotationally mounted on a common axis (7). 3. The device according to claim 1, characterized in that the spring element cam (4) and the counter cam (3) have the identical shape and made preferably as a common cam. 4. The device according to claims 1 to 3, characterized in that the double lever (5) rotation caused by the control cam lifts lowering the cross transfer tongs, wherein the double lever (5) rotation caused by the counter cam (3) or the spring element cam (4) lowers the tongs. 5. The device according to claims 1 to 4, characterized in that the control cam (2), the counter cam (3) and the spring element cam (4) are formed so that in a fully lowered position of the cross transfer tongs the spring element roller (62) adjoins the spring element cam (4) and the spring element (61) creates on the double lever the torque pressing on the cross transfer tongs downwards, wherein the control roller (54) is raised from the control cam (2), and the counter roller (55) is raised from the counter cam (3). 6. The device according to claims 1 to 5, characterized in that the control cam (2), the counter cam (3) and the spring element cam (4) are formed so that they are adapted to lift the cross transfer tongs by the control cam (2) under the action of the torque created by the spring element (61) on the double lever (5) in a lower position of raise, wherein the counter roller (55) is raised from the counter cam (3). 7. The device according to claims 1 to 6, characterized in that the control cam (2), the counter cam (3) and the spring element cam (4) are formed so that they are adapted to lower the cross transfer tongs by the control cam (2) at the expense of the torque created by the spring element (61) on the double lever (5) from the low position of raise to the fully lowered position, wherein the counter roller (55) is raised from the counter cam (3). 8. The device according to claims 1 to 6, characterized in that the control cam (2), the counter cam (3) and the spring element cam (4) are formed so that they are adapted to lift the cross transfer tongs by the control cam (2) from the fully lowered position under the action of the torque created by the spring element (61) on the double lever (5) with a slow lifting to the middle position at adjoining the counter roller (55) to the counter cam (3) and after that quick lowering to the fully lowered position which is approximately three times quicker compared to the lifting movement supported at the expense of the torque created by the spring element (61) on the double lever (5), wherein the counter lever (55) is raised again from the counter cam (3). 9. The device according to claims 1 to 6, characterized in that the control cam (2), the counter cam (3) and the spring element cam (4) are formed so that they are adapted to lift the cross transfer tongs by the control cam (2) from the fully lowered position under the action of the torque created by the spring element (61) on the double lever (5) at adjoining the counter lever (55) to the counter cam (3) to the high lifting position and repeated lowering to the fully lowered position supported at the expense of the torque created by the spring element (61) on the double lever (5), wherein the counter lever (55) is raised again from the counter cam (3). 10. The device according to claim 9, characterized in that the control cam (2), the counter cam (3) and the spring element cam (4) are formed so that during the movement cycle of the movable cam support (1) the cross transfer tongs capable from the fully lowered position to the middle lifting position, lift from it to high lifting position and at last lower from it to the fully lowered position. 11. The device according to claims 1 to 10, characterized in that of the movable cam support is a rotating control shaft (1).