DE2156937A1 - STRIPPING MECHANISM FOR A MACHINE TOOL - Google Patents

Description

PATENT LAWYERS

PATENTANWÄLTE LICHT, HANSMANN, HERRMANN 8 MÖNCHEN 2 THERES I ENSTRASSE 33

Dipl.-Ing. MARTIN LICHT Dr. REINHOLD SCHMIDT DipLWirfsch.-Ing. AXEL HANSMANN Dipl.-Phys. SEBASTIAN HERRMANN

Munich, the

Your sign

6, Nov. 197t

Our sign

Ke / vL

THE WARNER & SWASEY COMPANY CLEVELAND, COUNTY OP CUYAHOGA, OHIO 44106, V ₀ St. A. 11000 CEDAR AVENUE

Stripping mechanism for a machine tool

The invention is concerned with a stripping mechanism, the old is provided with a stripping unit that is used during the Operation of a machine tool can be kept switched on or off.

A well-known punch press is old a scraper · » aeohanisaus which presses a workpiece against a supporting surface when the punching stack or the tool is withdrawn from the workpiece. This well-known Abstreifaeohanisaus is operated on every cycle of the punch press. However, there are certain operating conditions under which it is desired not to put the Abstreifaechanisaus in operation, so to keep it ineffective.

The object of the invention is therefore to create a new and improved Abstreifaeohanisaus,

Patent attorneys Dipl.-Ing. Martin Licht, Dipl.-Wirfsch.-Ing. Axel Hansmann, Dipl.-Phys. Sebastian Herrmann

8 MÖNCHEN 2, TH ERESI ENSTRASSE 33 · Telephone: 281202 · Telegram address: üpatli / Munich Bayer. Club bank; Monks, branch Oskar-von-Miller-Ring, account no. 882495 · Postfscheck account: Munich No. 1633 97

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the optionally corresponding to the one placed on a machine operational requirements can be kept in an operating state and in an inoperative state. Yes In the operating state, the stripping unit of the stripping mechanism should press a workpiece against a load-bearing surface. sen as soon as a tool is withdrawn from the workpiece, while in the inoperative state the wiper unit is not in Action occurs to press the workpiece against the bearing surface as soon as the tool is withdrawn.

In this context, a new type of tower dance » press, with which machining on a workpiece processing operations can be carried out and which has an optionally actuatable stripping unit that is on a upper tower of the punch press is mounted and can be actuated to a workpiece against a load-bearing surface to push the lower tower as soon as a tool is withdrawn from the workpiece with the aid of a ram. Further a transmission device is provided, the driving forces from the ram to the stripping unit during a Operating cycle of the press can be transferred, the transfer device between an operating state in which it transmits the driving forces from the ram to the stripping unit, in order for the latter to move the workpiece against the lower tower to be pressed as soon as the tool is withdrawn, and an inoperative state can be switched in which the Transmission device does not have any driving forces from the ram transfers to the stripping unit, so that the stripping unit the workpiece does not press against the lower tower if that Tool is withdrawn.

An exemplary embodiment of the invention is shown below explained in more detail with reference to the drawing. In the drawing show:

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Fig. 1 «in part of a punch press with a« Release mechanism,

Fig. 2 shows a part of the length of the line 2-2 in 1, from which the stripping mechanism can be seen in the operating state, in which it is a Presses workshop against a load-bearing surface, as soon as a tool is withdrawn from the workpiece,

Fig. 3 is a partial plan view, similar to that of Fig. 2;

which shows the stripping mechanism is inoperative, in which the workpiece is not against

a bearing surface is pressed as soon as a tool is withdrawn, and

FIG. K shows a similar representation of a control circuit for the punch press of FIG.

Although the stripping mechanism 10 described below can be used with many types of machine tools, it is shown in FIG. In accordance with conventional practice, the tower punch press 12 has selectively rotatable upper and lower towers Ik and 16. The lower tower 16 defines a supporting surface 20 on which a workpiece 22 is placed. During operation of the punch press 12, a hole is punched by a punch or tool 26 which is guided through the workpiece into a mold or opening 28 in the lower tower 16. The punch 26 is pressed downwards by a ram 30 which is set in motion in a suitable manner, for example by means of a drive device which has a crankshaft, clutch and a drive motor.

The stripping mechanism 10 is equipped with a stripping hold-down unit 3%, which is an upper side of the workpiece 22 touches to the workpiece against the lower tower 16 to

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as soon as the punch 26 is withdrawn. One Stripping plate 36 of stripping unit 34 touches the workpiece 22 and is provided with a central opening 38 through which the punch 26 passes. The cross-sectional shape of the Opening 38 is the same as the cross-sectional shape of the punch 26

In order to enable the stripping plate 36, with the Workpiece 22 to come into and out of contact is the stripper plate on the upper tower 14 with the aid of several stripper pins 40, which are pressed up by springs 42, stored leather. The springs 42 press the Abstreifplalte 36 upwards against the underside of the tower 14. As soon as the ram 30 is lowered or extended, the punch 26 through the To push workpiece 22 through, the Abstieifplat 36 te pressed down and with the Weikstück 22 under the action of of the plunger 30 through a stripping drive assembly 46 and a selectively actuatable transmission assembly 48, the between the drive assembly 46 and the stripping hold-down- Unit 34 is arranged, brought into contact. After the The ram 30 has been withdrawn sufficiently to bring the punch 26 out of contact with the workpiece 22, the compression springs 42 act to the effect that they move the stripping hold-down unit 34 into the retracted position of FIG move back.

When a punching process starts, the upper and lower spring plates 52 and 54 in the stripper drive assembly 46 moved with the plunger 30 downwards, so that the lower Spring plate 54 makes contact with a plurality of transmission pins 60 in the transmission arrangement 48. If the downward movement of the Plunger 30 continued, so on the transmission pins 60 against the action of the springs 62 exerted such a pressure that they rest axially against the guide pins 66, which are slidably arranged in sleeves in a stamping press head 70 «, the downward movement of the ram 30 is still

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continued, a drive plate or a drive body 74, which is slidably mounted on the plunger 30, pressed against the stripping pins 40. That way will between the lower spring plate 54 of the drive assembly 46 and the stripper plate 36 by means of the transfer pins 60, the guide pins 66, the drive plate 74 and the stripping pins 40 created a solid connection.

A continuation of the downward movement of the plunger 30 has the consequence that the stripping plate 36 against the top of the work piece 22 is pressed. It should be noted that the front or lower end 73 of the punch 26 behind follows or lags the front or bottom surface 80 of the stripper plate. Therefore, the stripper plate 36 contacts the workpiece 22 and presses it against the lower tower 16 before the punch 26 comes into contact with the workpiece.

Once the stripper plate 36 has come into pressure contact with the workpiece 22, the stripper drive assembly becomes 46 is resiliently compressed so that a relative movement takes place between the punch and the stripping plate 36. This relative movement enables the punch 26 to enter the opening 28 through the workpiece 22 while the workpiece is pressed against the lower tower 16 by the stripping plate 36.

In order to achieve a relative movement between the punch 26 and the stripping plate 36, the stripping drive arrangement 46 is compressed under the action of the forces transmitted between the stripping plate 36 and the lower spring plate 54 of the drive arrangement by the stripping pins 40 and the transmission device 48. Thus, the lower spring plate 54 is by means of a bushing 86 * \ t slidably mounted to the plunger 30th The upper spring plate 52 is firmly connected to the plunger 30 and is opposite to that of the springs 90, which are between the upper and lower plungers

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lower spring plate are arranged on guide members or pins 92, exerted force action in the direction of the lower Spring plate 54 movable downwards. It should be noted that that the tension springs 90 are somewhat stiffer than the stripping pin tension springs 42 and transmission pin tension springs 62, so that between the spring plates 52 and 54 takes place a relative movement only after the transmission pins 60 and the Stripper pins 40 axially relative to the lower tower 14 have been moved under the action of the forces transmitted from the plunger 30 through the drive arrangement 46.

After a hole has been punched in the workpiece 22, the ram 30 is withdrawn Withdrawal movement of the ram 30 pushes the workpiece 22 downward against the lower tower 16 to remove the workpiece from the Stripping punch 26 when it is withdrawn. In this way, as soon as the ram 30 begins its upward stroke, the upper spring plate 52 moves from the lower Spring plate 54 away upwards, the springs 90 being relaxed. When the springs 90 are relaxed, they compress the lower plate 5 ^ downwards, with a force that is sufficient to hold the stripping plate 36 firmly against the workpiece 22 to press «The stripping compression springs 42 and the transmissions compression springs 62 therefore remain under the action of the fc transmission pins 60, guide pins 66, the drive plate and forces transmitted to the stripper pins 40 in the compressed position.

When the upper spring plate 52 comes into contact with the stops or heads 93 on the guide pins 92 the front end 78 of the punch 26 at the front upper- flat · 80 of the stripping plate 36 has been pulled past »Accordingly Once the workpiece 22 has been completely stripped off the punch 26, another upward movement of the ram 30

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has the consequence that both the upper and the lower spring plate 52 and 54 move upwardly away from the lower tower 16 together. This releases the stripping plate 36, so that it can move upwards under the action of the springs 42 to come into contact with the upper tower 14. As the plunger 30 is retracted further, the transmission pins become 60 moved axially upward into the position shown in FIG. 1 under the action of the springs 62. Finally will the upper spring plate 46 from the upper ends of the transmission pins 60 emptied.

The leveling mechanism let you choose between one Operating state in which the Abstreifplat te 36 the WeikstUck presses against the with a tower 10 when the punch 26 is withdrawn, and an out-of-love condition in which the stripping plate does not hold the workpiece against the lower tower pushes when the punch is withdrawn, operable. To the stripping mechanism 10 between the operating state and to have it out of operation, the Transmission device V3 optionally between an active state (FIG. 2), in which it is operated by the stripping drive arrangement 46 transmits forces to the wiper hold-down unit 34, and an inactive state (FIG. 3) in which the stripping drive assembly 46 does not exert any forces on the stripping hold-down unit 34 transmits. The transfer device 48 is switched between the active state of FIGS the inactive state of FIG. 3 by an arrangement 102 consisting of a piston and cylinder.

When the transfer device 48 is in the active State is, the transmission pins 60 are with the Guide bars 66 in axial alignment, as in FIG. 1 shown to exert forces from the wiper drive assembly 46 on the guide pins 66 and the wiper hold-down assembly transferred to. The transmission device 48 is thereby in

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brought the inactive state that the working piston 102 is extended to the transmission pins 60 transversely into the to move inactive position of FIG. 3, in which they are axially offset with respect to the guide pins 66. When the transmission device 48 is in the inactive state of FIG. 3, are by a downward movement of the lower spring plate 54 the transmission pins 60 only axially downwards into the Holes 108 formed in the press driving head 70. Therefore, through this downward movement, the transmission guide pins 60 no downward movement of the guide pins 66 and the drive plate 74 causes the stripper plate 36 against the force of the springs 42 extend.

To move the transmission pins 60 between the vine To enable the active position of FIGS. 1 and 2 and the inactive position of FIG slidably disposed on a transmission plate 114 which is rotatably mounted on a tappet sleeve II6. The transfer plate 114 has a drive arm 118 which is articulated with a piston rod 120 of the piston and cylinder assembly 102 stands. Thus, when the piston and cylinder assembly 102 from the retracted position of FIG. 2 to the extended position Position of Fig. 3 is moved, the transfer plate 114 is rotated about the longitudinal axis of the plunger 30 to thereby the over- ^ support pins 60 with the holes 108 in the drive head 70

to be axially aligned. Once the transmission pins 60 are in the axial fluidization position with the holes 108, the transmission device 48 can no longer transmit force from the stripping drive assembly 46 to the stripping hold-down unit 34, so that the stripping plate 36 remains in the retracted position shown in FIG when the ram 30 and punch 26 are extended. Of course, once the piston and cylinder assembly 102 is retracted, the transfer plate is rotated from the position of Figure 3 in _o that of Fig. 2 114 to thereby form the transmission pins 60 in

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Axial flow position ait the guide pins 66 back to the move. A screw or pin 124 that is securely attached to the drive head and turns into a curved one Slot 126 in the transfer plate 114 extends into it, guides the movement of the transfer plate between the active position of FIG. 2 and the inactive position of FIG. 3.

Numerical control ' devices 130 (Fig. 4) are provided. The numerical control devices 130 have a known reader 134 for a Punched tape I36 on. During the operation of the punch press the stripping mechanism 10 is between the operating state and the inoperative state according to an on the paper tape 136 predetermined program run * As a result, signals are sent from the tape reader 134 to the numerical control 138 for the punch press 12, which indicate whether the Ab— streifmeohanismus 10 is to be kept in or out of operation during a certain punching process.

The numerical controller I38 activates according to these Signals the slide control 142 to thereby set the piston and cylinder assembly 102 in motion as soon as the stripping mechanism 10 switches between operating and inoperative states between successive punching operations should be driven. To prevent the punch press 12 from working when the transmission assembly 48 is only partially between the active position of Fig. 2 and the inactive position of Fig. 3 and to provide an indication of the location or state of the transmission arrangement, are sensing switches 150 and 152 on the press drive head 70 (see Figures 2 and 3) to determine the location of the transfer plate 114 with respect to the press drive head. When the transfer plate 114 is in the active 2, the normally open id switch 152 is closed by a cam 154 which is open

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the transfer plate 114 is attached. Similarly, if the transfer plate 114 is in the inactive 3 is the normally open limit switch 150 closed by a cam 158 on the transfer plate 114. The sampling switches I50 and 152 work with the Bump! Controller 142 (see FIG. 4) together to create an interlock that makes it impossible for the punch press 12 to begin a punching operation until one of the Sampling switch, i.e. either switch 150 or switch 152, is closed. Which of the limit switches 150 and 152 each must be closed, of course, depends on the program recorded on the punched tape I36.

From the above, it can be seen that a stripping mechanism IO is created, the optional between an active position in which the stripping mechanism presses a workpiece 22 on a supporting surface as soon as the punch 26 of the Workpiece is withdrawn, and an inactive position in which the stripping mechanism does not push the workpiece against the supporting one Surface presses when the punch is withdrawn, is adjustable.

To the Abstreifmeohanismus 10 between the operating state and to put the inoperative condition in motion, the piston and cylinder assembly 102 is actuated, whereby the Transfer plate 114 is rotated to thereby move the transfer pins 60 between an active position in the egg · axially aligned with the guide pins 66 in order to transmit force from the stripping drive assembly 46 to the stripping hold-down unit 34, and an inactive position, in which the transmission pins are arranged axially offset with respect to the guide pins 66. In the inactive In this case, the transfer pins 60 are unable to transfer force from the wiper drive assembly 46 to the wiper hold-down unit 34. The movement of the stripping mechanism 10 between the operating and the inoperative state can be advantageously carried out with the aid of the numerical information Control 130 for the punch 12, according to

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a program specified on a punched tape I36.

Although the transfer assembly 48 is described herein in connection with the guide pins 66 and the drive plate 74 and has been shown, the guide pins could of course be used and the drive plate can also be omitted, so that then the stripping pins 40 are immediately separated from the transfer pins 60 are driven. In addition, the stripping mechanism 10, although it is controlled here in connection with a perforated belt Tower punching press 12 has been shown, can also be used in conjunction with other types of machines that can be used with work with different tax types.

It should also be noted that instead of the only one described here and shown in the drawing Hole punch 26 and die 28 also several hole punch on the upper tower 14 in connection with several dies or Forms can be attached to the lower tower l6, as is conventional Ba art. Leave that way several stripping beds 3 ^ on the upper tower 14 before ~ see. Each of these stripping units is one of the individual Punch 26 assigned. As the upper and lower towers 14, 16 are rotated, each punch and each stripping unit again moved so that it cooperates with the plunger 30 in an intended manner. Therefore can be the same Stripping drive assembly 46 and transmission assembly 48 for the sequential actuation of multiple stripping units 34 use. Of course, the transmission arrangement 48 is switched to the inactive state as soon as this is on Punch tape 136 recorded program indicates that a certain stripping unit is to remain out of operation during a punching process.

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Claims (1)

PATENT CLAIMS /i.J Machine tool for performing machining operations on a workpiece, characterized by a Workpiece (22) bearing surface (20), a ram (30) for moving the tool (26) in an operating cycle during which the tool engages the workpiece (22) comes and the tool (26) is withdrawn from the workpiece, an optionally actuatable stripping device (36, 40), which belongs to the ram (30) and serves to press the workpiece (22) onto the bearing surface (20) when the Tool (26) is withdrawn from the workpiece with the aid of the ram (30), a transfer device (48, 60), between an active state in which it transmits actuating forces to the stripping device (36, 40), and an inactive state in which it does not transmit any actuating forces to the scraper device, is movable, in order not to enable the stripping device to press the workpiece against the supporting surface (22) when the Tool is withdrawn, and by a drive assembly (46) which the transmission device (48, 60) between the active state and moving inactive state 2. Machine tool according to claim 1, characterized in that the transmission device (48, 60) has a plurality of actuating elements and bearing elements for supporting the actuating elements in order to move in a first direction and thereby driving forces on the stripping device (36, 40) to transmit, and that the drive device (46) is provided with means through which the actuating elements are movable in a second direction transverse to the first direction, thereby the transfer device between the active and inactive state. 309821/0105 ? 15 6 9 3 3. Machine tool according to claim 1, characterized in that the transmission device (48) and the stripping device (46) has a plurality of sets of pins (60, 40) that the transmission device (48) is provided with devices by means of which one of the pin sets from a first layer, in which it is axially aligned with another set of pins, can be moved into a second position in which the first set of pins is axially offset with respect to the other set of pins when the transmission device is out of the active state is brought into the inactive state. 4. Machine tool naoh claim 3, characterized in that the stripping device has a stripping plate (36), which is permanently connected to one of the sets of pins (40, 60). 5. Machine tool according to claim 1, characterized by a control device (130) for controlling the operation of the machine, the control device having scanners (150 152) is provided, through which it can be determined when the transmission device (48) is in the inactive state and in the active state, and by a locking device by which the Tool (26) is moved by the ram (30) when the scanning device (150, 152) detects that the Transmission device (48) is in a state other than active or inactive. 6. Machine tool naoh claim 1, characterized by a ram control device (142) for controlling the ram operation, a main control device (138th) for activation the central control, and by a locking device, with which the activation of the shock control (142) by the Main control (I38) is prevented as soon as the transmission device (48) is in a state other than that active or inactive 309821 / 010S 7c machine tool according to one of claims 1 to 6 in the form of a tower punching press, characterized by a base body, an upper tower (14) which is rotatably mounted on the base body, a lower tower (i6) which is rotatably mounted on the base body and at least partially forms a tool-bearing surface (20), a ram device (30) with which a relative movement between the tool (26) and the upper and lower tower (Ik ₉ i6) can be carried out, in order thereby to move the tool through a work cycle, in which the tool (26) can be brought into contact with the workpiece * 22) and can be withdrawn from the workpiece, a selectively actuatable stripping device (36) which is mounted on the upper tower (14) and under the action of on it by the Plunger device (30) transmitted forces can be driven in order to press the workpiece (22) onto the workpiece-bearing surface on the lower tower (i6) when the tool (26) is removed from the workpiece with the aid the ram device (30) is retracted, a transmission device (48) operatively connected to the stripping device (36) and the ram device (30) for transmitting drive forces from the ram device to the stripping device during an operating cycle of the punch press (12), wherein the transfer device (48) between an active state in which it transfers driving forces from the ram device (30) to the stripping device (36) to cause the stripping device to press the workpiece against the workpiece-bearing surface on the lower tower (16) once the tool / is withdrawn and is operable in an inactive state in which the transmission device (48) is unable to transmit driving forces from the ram device to the stripping device, thereby preventing the stripping device from pushing the workpiece against the To press the workpiece-bearing surface as soon as the tool (26) returns is withdrawn, further by a drive device (46) which the transfer device (48) between the active state, in which the stripping device presses the workpiece against the workpiece-bearing surface while the tool (26) is being withdrawn, and the inactive state 309821/0105 drives, in which the stripping device is unable to move the workpiece towards the workpiece-bearing surface (20) press while the tool (26) is withdrawn, further by a scanning device (150, 152), with the detectable is when the transmission device (48) is in one of the two states mentioned, and by a control device (142) that allows the operation of the ram device (30) to move the tool (26) through one cycle of operation only can be initiated after the scanning device (150, 152) has been determined has that the transmission device (48) is either in the active or inactive state, 8. tower punching press according to claim 7 »characterized in that the stripping device (34) has a Abs tre if element (36) which is arranged between the upper and lower tower (14, l6) and forms an opening (38) through which the tool (26) passes through to come into contact with a workpiece (22) and a plurality of stripping carriers. (40), which are connected to the stripping element (36) f ^ st and are movable on the upper tower (14) _o sla £ vi , and stripping springs (42) which are connected to the stripping support bodies (40) and the lower tower (l6 _s are operatively) connected to press the scraper element (36) against the upper tower (i4), that the transfer device (48) comprises a resilient urging means (74) for transmitting force from the plunger means (30) which enables the plunger device in the situation ^ to move relative to the stripping device (36) when the workpiece (22) is pressed with a certain force by the stripping device on the supporting surface (20), furthermore a transfer body and several transfer pins (60) which are attached to the transfer body and serve to transmit power between the drive device (46) and the stripping device (38) when the transmission device (48) is in the active state, the transmission pins (60) in With respect to the stripping device bits are axially movable by means of the drive device when the transfer device is in the inactive state, so as not to the transfer pins (60) 309821/0105 allow between the drive device and the stripping device To transfer forces. 9ο tower punching press according to claim 71, characterized in that that the control device (130, 138) with devices (134) is provided that the transmission device (48) according to a predetermined program between the active and the inactive Control state « 10 · Tower punching press according to one of claims 7 to 9 » by a base body, an upper tower (14), the is rotatably mounted on the base body, several punches (26) which are arranged on the upper tower, a lower one Tower (16) which is rotatably mounted on the base body and at least partially dne the workpiece (22) supporting surface (20) forms a drive device for rotating the towers (14, 16), thereby turning each punch (26) into a work station to move a ram device (30) at the work station, which causes a relative movement between one of the punch (26) and the upper and lower tower (14, i6) to thereby move the one punch through a cycle of operation in which the one punch is engaged with the workpiece and is withdrawn from the workpiece, a plurality of selectively actuatable stripping devices (34) mounted on the upper tower (14) are arranged and each of which is assigned to one of the punch (26) and at the work station is drivable under the action of forces from the ram device (30) at the work station on the stripping device (34) are transferred to thereby the workpiece (22) against the workpiece-bearing surface (20) to press the lower tower (14) as soon as the punch is at the work station from the workpiece with the aid of the ram device (30) is withdrawn, a transmission device (48) which is in operative connection with the plunger device (30) stands in order from this ram device to each of the stripping devices (34) in turn at the work station during the operating cycles of the punch press (l2) drive forces to be exceeded 309821/0105 wear, wherein the transmission device (48) between a active state in which it is driving forces from the ram device (30) transfers to a scraper device (34) at the work station to the scraper deck on the lower To hold the tower (16) when the punch (26) is at work. station is withdrawn, and is movable to an inactive state in which the transfer device (48) is unable is, from the ram device (30) to the stripping device (34) to transmit driving forces at the work station in order to render the stripping device at the work station incapable to move the workpiece (22) against the workpiece supporting Surface (20) to be pressed when the punch * 26) on the Workstation is withdrawn, further by an actuating device (46) with which the transfer device (48) between the active state in which the stripping device (34) at the work station the workpiece fftgon the one carrying the workpiece Surface presses while the punch is retracted at the work station and is operable in the inactive state is in which the. Stripping device at the work station is unable to hold the workpiece against the one carrying it Surface to be pressed while the punch is withdrawn at the work station and by a scanning device (150, 152) used to determine when the transmission device has been brought into one of the states mentioned, as well as by a control device (130, 142) with which the operation of the ram device (30) can be initiated in order to only move a punch (36) through an operating cycle, after it has been determined by the scanning device that the transfer device is either in the active or inactive state « 11. Tower punch press according to claim 10, characterized in that each of the stripping devices (34) has a stripping element (36), which is arranged between the upper and lower tower (14, 16) and forms an opening (28) through which an associated punch (36) runs around a workpiece 309821/0105 (22) to touch several stripping support bodies (40), which with the stripping element (36) are firmly connected and are movably mounted on the upper tower (14), stripping springs (42), which are in operative communication with the stripping supports (40) and the lower tower (16), around the stripping element (36) to press upwards against the upper tower (14), the transmission device (48) being a resilient drive device with which the shock! device (30) Force can be transmitted, and which enables the pusher device to to move relative to the stripping device at the work station as soon as the workpiece (22) with a certain force is pressed against the supporting surface (20), further by a transfer body and several over- support pins (60) disposed on the body and Power is transmitted between the drive device and the stripping device at the work station as soon as the transmission device (48) is in the active state, the transmission pins (60) in the axial direction with respect to the Stripping device at the workstation using the Drive device are movable as soon as the transmission device is in the inactive state, thereby the To make transmission pins (60) ineffective so that they are between the drive device and the stripping device cannot transfer any forces at the workstation, 12. Tower punching press according to claim 10, characterized in that the control device (130) is equipped with a device (134) which causes a rotation of the upper and lower tower according to a predetermined program to thereby one! The punch (26) and the to move the associated stripping device (48) to the work station, and by means of a device with which the transfer device (48) can be put into operation between the active and the inactive state according to the predetermined program, _o 309821/0105 ff Blank page