Abstract: A drawing device for a press is provided with a drawing slide, with a sheet holder having a sheet held therein, and with a pressure cheek which is arranged under the sheet holder and is connected with a piston rod which can be displaced in parallel to the drawing direction. The piston rod is operatively connected with a preacceleration piston of a preacceleration cylinder. The drawing cylinders are applied to the pressure cheek by way of drawing rods, in which case the drawing cylinders have drawing pistons with first and second piston spaces. The first piston space directed to the drawing rod is pressure controlled during the drawing operation for the sheet forming. In the event of a press stoppage during a sheet forming, a control valve device can be activated so that, for maintaining the pressure existing in the first piston space at the start of the press stoppage during the time of the press stoppage, pressure medium can be charged into the first piston space by way of a pressure medium generator.

Abstract: A drawing device for drawing presses has a sheet holding ring which travels along the entire drawing path during the drawing operation. For admitting a corresponding sheet holding force to the sheet holding ring, a pneumatic force generating device is provided whose pressure cylinders generating the force are permanently or statically acted upon by compressed air with a defined pressure volume. For adjusting the sheet holding force, the corresponding pistons of the force generating device can be acted upon on their opposite side with counterpressure of a defined pressure level. Thus, the course of the sheet holding force can be adjusted by way of the drawing depth. For local adjustment of the distribution of the sheet holding force along the sheet holding ring, hydraulic cylinders are arranged between the sheet holding ring and the pressure box, and are combined into groups.

Abstract: A groove stamping machine stamps the required grooves successively into a disk-shaped blank particularly for manufacturing stator and rotor plates for electric machines. The groove stamping machine has a stationary bench which, on the end side, carries a spacing apparatus for receiving the blank. A stamping device disposed on the bench is adjustable with respect to the spacing apparatus. The distance between the spacing apparatus and the stamping device can be adjusted by a ball thread spindle which acts between the spacing apparatus and the stamping device. The fixing of an adjusted distance takes place by the blocking of the ball thread spindle, preferably by way of a disk brake. The stamping device is disposed via a combined roller slide bearing on the bench which permits a low-friction displacement of the stamping device which also supporting the latter in a stiff manner.

Abstract: A braking and/or clutch arrangement has a cooling system which is sealed off with respect to excess pressure. Liquid coolant is fed under pressure to friction elements and first comes in contact with the surface areas of the friction elements whose relative speed is the highest. The operating device required for operating the friction elements is connected with the clutch half which in the operation is subjected to lower rotational accelerations to reduce heat formation.

Abstract: A transfer device 41 provided particularly for multistation presses 1 has a holding device 46, 47 which is carried by several rods 53, 54, 55; 83, 84, 85 and which can be swivelled in space and positioned by means of the rods 53, 54, 55; 83, 84, 85. The rods 53, 54, 55; 83, 84, 85 are preferably connected with linear driving devices 61, 62, 63; 86, 87, 88 which therefore jointly act upon the holding device 46, 47. In the case of an embodiment having six degrees of positioning freedom, three of the rods 53, 54, 55; 83, 84, 85 are applied to a first hinge point 49 of the holding device 46, 47. By means of their other ends, these rods 83, 84, 85 define a triangle. Of the remaining three rods 53, 54, 55, two 53, 54 are applied to another hinge point 56 and a third 55 is applied to a hinge point 57 situated away therefrom which again defines a triangle together with the other two hinge points 49, 56. In addition to the simple workpiece transfer, such a transfer device 41 permits complicated positioning tasks.

Abstract: A multistation press has a three-axis transfer provided with transport rails onto which carrier rails are placed. The carrier rails carry grippers for the workpieces. During the tool change, the carrier rails are deposited on corresponding receiving devices of the sliding table. The transport rail is at first moved to deposit a first carrier rail connected therewith on the receiving device. Then the transport rail is separated from the carrier rail and is moved to bring a second carrier rail still connected therewith to the receiving device. The receiving device receives the second carrier rail in the immediate vicinity of the first carrier rail, whereby two carrier rails overlap and are spaced closely side-by-side. The receiving device is then laterally swivelled away. The carrier rails are deposited on the receiving device without the aid of driving devices operating between the transport rail and the carrier rail.

Abstract: A transfer device is provided particularly for multistation presses and is arranged between two working stations. The transfer device has a suction bridge which extends transversely with respect to a transfer direction and which is guided on its ends by two control arm gearings synchronously along a predetermined transfer curve. The control arm gearings are formed by control arms or rods which are connected on the end side with the cross traverse and which, on their respective end situated away from the cross traverse 46, are held in preferably vertically aligned linear axles, in which case the control arms, in respective pairs, enclose the same angle with one another. By the targeted controlling of the linear axles, almost arbitrary transfer curves can be travelled within the scope of the range of the transfer device. All linear axles are directly supported on a stationary frame whereby a high stiffness and precision is achieved even at high accelerations.

Abstract: An arrangement is used for transferring workpieces through a succession of machining stations of a press, a simulator or similar machining system or tool setting system. This arrangement has two spaced transport rails which are arranged parallel to one another and which can be moved by motors horizontally in a longitudinal direction thereof, vertically up and down and horizontally toward one another. Each individual transport rail is pivotally connected for a horizontal movement in each case by way of a coupling rod. Traverses are operatively connected by way of at least one of the coupling rods with one respective transport rail. The traverses can be moved by an additional transverse drive which is synchronously driven by the driving motors arranged in a closing box of the press for the horizontal movement of the transport rails toward one another.

Abstract: A transfer arrangement includes a transfer unit constructed as a three-axle transfer unit. For two parallel, spaced gripper rails which are to be moved synchronously, stationarily disposed driving units are provided for the respective transport direction, the transverse direction and the stroke direction. The transverse driving unit acts by way of coupling devices upon the gripper rails to establish a driving connection between the transverse driving unit and the gripper rails only when these must be laterally adjusted. Otherwise, the transverse driving unit is separated from the gripper rails. Thereby, the masses, which are to be moved up and down with the gripper rails and the resulting acceleration forces are considerably reduced and shortened timing periods are permitted. The transverse driving unit 40 can be arranged below a plane defined by the gripper rails.

Abstract: For shaping longitudinal grooves or comparable longitudinal structures into round housings or housings which are otherwise regularly shaped with respect to a longitudinal axis, a press is provided with a deforming tool whose top tool presses a workpiece through a corresponding roll arrangement of a bottom tool. The bottom tool has an opening which is coaxial to the top tool contains an axially displaceable cage provided with a group of rolls. The rolls are rotatably disposed in the cage and are supported on radially exterior abutments which are stationarily held in the bottom tool. The rolls are constructed as profile rolls and shape the desired longitudinal structures into the workpiece when it is moved through between the profile rolls. The resulting radial reaction forces are absorbed exclusively by the abutments and not by the cage. For supporting the longitudinal movement of the cage, a transmission is formed, for example, by gear wheels which are rotatably disposed on the cage.

Abstract: An apparatus for three-dimensionally driving gripper rails in a multiple-pedestal press has raisable and lowerable guides for moving the gripper rails in a clamping and releasing direction in cross slide supports. The cross slide supports are movable in the clamping and releasing direction. The motion of the gripper rails in the clamping and releasing direction is brought about by a servomotor, which is secured at the level of the cross slide supports and which cooperates, with shaft portions extending from both sides thereof and embodied as spindles, with clasp nuts on the cross slide supports. In addition to the advantage of the direct drive for the clamping and releasing motion of the gripper rails, the region required by the tools in the working stages is utilized for accommodating the servomotors.

Abstract: A transfer arrangement for a multistation press has two parallel gripper rails on a carrier and can be moved, together with the carrier, along a transfer curve. The gripper rails carry gripper fingers which are assigned to one another in pairs and which can be moved toward and away from one another by an oppositely directed movement of the gripper rails. The application movement is generated by parallelogram transmissions which are used for the bearing and for the drive of the gripper rails. The parallelogram transmissions are driven from a single drive source by a cardan shaft which permits the implementation of the transfer movement without any change of the relative position of the gripper fingers with respect to one another. Such a transfer arrangement is arranged on one side of the row formed by the tools and permits good access to the workpieces from the respective other side. As required, the entire transfer arrangement can be removed from the tool area, preferably in a swivel movement.

Abstract: A multistation press has a three-axis transfer provided with transport rails onto which carrier rails are placed. The carrier rails carry grippers for the workpieces. During the tool change, the carrier rails are deposited on corresponding receiving devices of the sliding table. The transport rail is at first moved to deposit a first carrier rail connected therewith on the receiving device. Then the transport rail is separated from the carrier rail and is moved to bring a second carrier rail still connected therewith to the receiving device. The receiving device receives the second carrier rail in the immediate vicinity of the first carrier rail, whereby two carrier rails overlap and are spaced closely side-by-side. The receiving device is then laterally swivelled away. The carrier rails are deposited on the receiving device without the aid of driving devices operating between the transport rail and the carrier rail.

Abstract: A drawing mechanism for a press has a drawing slide and a plate holder with a plate held therein. A holding force, which acts against the drawing direction, can be applied to the plate by way of a piston rod which can be displaced in parallel to the drawing direction. A control accelerates the plate holder in the drawing direction before the drawing slide is placed on the plate holder because the plate holder is rapidly acceleratable independently of the drawing slide. A pre-acceleration cylinder is fixed to the press and has a pre-acceleration piston which is operatively connected with the piston rod. The pre-acceleration cylinder has first and second effective surfaces of different sizes which act in opposite directions, and a first and a second pressure chamber.

Abstract: A press with several press stations is provided for serially machining larger sheet metal parts. A transfer unit transports workpieces through the press stations which are arranged behind one another in the machining sequence. The transfer unit has a first section constructed as a three-axis transfer and a second section constructed as a cross-traverse transfer. The three-axis transfer has a pair of mutually parallel gripper rails with gripper devices which, by way of a lateral feeding movement of the gripper rails can be engaged with and disengaged from the workpieces. The cross-traverse transfer has a pair of mutually parallel transport rails which are connected with one another by cross-traverses provided with gripper devices for the workpieces. The cross-traverse transfer has parking positions between individual press stations in which the cross-traverses remain during the operation of the press stations.

Abstract: A transfer device in a metal forming machine, particularly a transfer press, bulky-part transfer press, press facility and the like, is provided with a slide which can be moved up and down by means of driving devices for the metal forming of sheet metal parts 16, having sliding tables for the tool change, having a cam drive for a transfer movement of connecting rods to which travelling carriages 2, 15 are pivotally connected which travel on transfer rails 3. Two opposite travelling carriages 2, 15 respectively are connected with one another by means of at least one cross traverse 12. On each side, the cross traverse 12 is connected with the respective travelling carriages 2, 15 by way of a lifting and lowering device 1.

Abstract: A press is provided with gripping rails for moving workpieces in work stations. The press is provided with a motor and a shaft moved thereby, on which shaft cams are mounted. Swing levers follow the shape of the cams, and connecting tabs direct the movements of swing levers toward driving movements of the gripping rails. At least two rollers are rotatably mounted on swing levers. The rollers run on the shaft cams. At least one of the two rollers is pressable with zero play against one of cams by a pretensioning device.

Abstract: A method serves to actively perform vibration damping of driven elements of workpiece transport devices in and on shaping machines, especially presses and punches. A measured state value of the driven element or one reconstructed by an observer is determined. The state value is then entered into a damping regulator which affects the drive of the driven elements. A damping regulating circuit is provided in addition to a position regulating circuit.

Abstract: An arrangement is used for transferring workpieces through a succession of machining stations of a press, a simulator or similar machining or tool-setting machine. Two parallel transport rails are spaced at a distance from one another and can be moved by motors horizontally in their longitudinal direction, vertically up and down and optionally horizontally toward one another. The motors are arranged on one traverse respectively, the transport rail being hinged to the traverse. Between the transport rails and the motors arranged on the traverse, a compensating guide is provided for the horizontal movement of the transport rails. The compensating guide has at least two struts and a double-armed lug with three hinge points, each of the struts being mounted on the traverse side in a hinged manner at one point respectively.

Abstract: A process supplies energy to electronically controlled drives, particularly drives for workpiece handling devices, in and on a press having a press slide. The workpiece handling devices are electromechanically driven and electronically controlled. In the event of a power supply system outage, at least the workpiece handling devices are supplied at least for a short time by an intermediate circuit of a drive amplifier or an uninterruptable power supply system with voltage. Thereby, all devices important for the movement of the workpiece handling devices are supplied with voltage from the intermediate circuit or the uninterruptable power supply system.