DE2156937C3 - Stripping device on a turret punch - Google Patents

Description

20th

The invention relates to a stripping device on a turret punch with one on and in a die from movable punch and a hold-down device acting as a stripper for the workpiece.

A well-known revolver punch of this type (US-PS 35 66 730) is provided with a stripping device that holds a workpiece against a supporting surface presses when the punch or tool is withdrawn from the workpiece. This well-known Device is actuated with each cycle of the turret punch. However, there are certain operating conditions among which it is desirable to put the stripping devices out of operation, i.e. ineffective too keep.

The object of the invention is therefore to provide the J5 To train the stripping device of the type mentioned so that they can optionally, according to the to the turret punch set operational requirements, can be disengaged. In the operating state should while the scraper press the workpiece against a supporting surface as soon as the punch of the workpiece is withdrawn, while this should not be the case in the inoperative state.

This object is achieved according to the invention in that between the ram drive and the hold-down device a mechanical transmission device consisting of two superposed, mutually rotatable parts is provided, the parts with coaxial, arranged centrally around the plunger Pins are provided, and the lower part between the pins has holes in which the upper pins are recordable.

In the following, the invention will be described in greater detail using the exemplary embodiment shown in the drawing explained. In the drawing shows

Fig. I is a partial view of a turret punch with the Scraper,

Fig. 2 is a partial sectional view taken along line 2-2 in Fig. I, from which the stripping device in the operating state it can be seen

Fig. 3 is a partial view similar to that of Fig. 3. 2, at that the scraper is out of operation and

4 shows a schematic representation of a control sound system for the turret punch from FIG. 1.

In Fig. I a turret punch 12 is shown. In accordance with conventional practice, this turret punch press has selectively rotatable upper and lower supports 14 and 16 for punch or die. The lower support 16 forms a supporting surface 20 on which a Workpiece 22 is arranged. During operation of the turret punch 12 is a punch 26, which is guided through the workpiece 22 into a mold or opening 28 in the lower support 16 Punched hole. The punch 26 is pressed down by a plunger 30, for example by a drive device comprising a crankshaft, clutch and a drive motor in motion is set. A stripping device 10 is provided with a Downholder 34 equipped, which touches an upper side of the workpiece 22 to the latter against the lower To press carrier 16 as soon as the punch 26 is withdrawn. A stripping plate 36 of the Hold-down 34 touches the workpiece 22 and is provided with a central opening 38 through which the Hole punch 26 runs through it. The cross-sectional shape of the opening 36 corresponds to the cross-sectional shape of the Punch 26.

To enable stripper plate 36 to come into and out of contact with workpiece 22 they on the upper support 14 with the help of several stripping pins 40, which by springs 42 upwards printed, spring-loaded. The springs 42 press the stripping plate 36 against the underside of the Carrier 14. As soon as the ram 30 is lowered in order to press the punch 26 through the workpiece 22, the stripper plate 36 is pressed down and with the workpiece 22 under the action of the ram 30 by a stripper drive assembly 46 and a selectively actuable transmission assembly 48, which is arranged between the drive assembly 46 and the hold-down 34, transferred Forces brought into contact. After the plunger 30 has been withdrawn enough to the The compression springs 42 act to bring the punch 26 out of contact with the workpiece 22 to the effect that it moves the hold-down device 34 into the retracted position of FIG. 1 move back.

At the beginning of a stamping operation, the upper and lower spring plates 52 and 54 are in the stripper drive assembly 46 moved downward with the plunger 30 so that the lower spring plate 54 has a plurality of pins 60 in the Transmission arrangement 48 touches. If the downward movement of the plunger 30 is continued, the Pins 60 against the action of the springs 62 exerted such a pressure that they are axially against the Create guide pins 66 which are slidably arranged in sleeves in a rotatable part 70. Will the Downward movement of the plunger 30 is continued, so a propulsion body 74, which is on the plunger 30 is slidably mounted. pressed against the stripping pins 40. This way it gets between the lower Spring plate 54 of the drive assembly 46 and the Abslrcifplatte 36 with the help of the pins 60, the Guide pins 66, drive plate 74 and stripping plate 40 created a solid connection.

A continuation of the downward movement of the plunger 30 has the consequence that the Abstreifplaite 36 against the Upper side of the workpiece 22 is pressed. The front or lower end 78 of the l.ochstempcls 26 follows behind following the front or bottom surface 80 of the stripper plate 36. Therefore the stripping plate 36 touches the Workpiece 22 and press! it against the lower beam 16 before the punch 26 with the workpiece 22 in Touch comes.

Once the scraper plate .16 with the workpiece 22 in

Pruek contact has come, the Abstreifantriebsanardnung 46 resiliently compressed so that between the punch 26 and the stripping plate 36 a relative movement takes place which enables the punch 26 to pass through the workpiece 22 in the opening 28 to enter while the workpiece 22 is pressed against the lower support 16 by the stripping plate 36.

In order to achieve that between the punch 26 and the stripping plate 36 a relative movement ι ο takes place, the drive assembly 46 is under the Effect of between the stripping plate 36 and the lower spring plate 54 by the stripping pins 40 and the transmission device 48 compressed forces transmitted. Thus, the lower spring plate 54 slidably mounted on the plunger 30 with the aid of a bush 86. The upper spring plate 52 stands with the plunger 30 in a fixed connection and is against that of the springs 90, which between the upper and lower Spring plate are arranged on guide members or pins 92, exerted force in the direction movable downward on the lower spring plate 54. It will pointed out that the tension springs 90 are somewhat stiffer than the springs 42 and springs 62, so that there is relative movement between the spring plates 52 and 54 only after the upper pins 60 and the stripping pins 40 in the axial direction relative to the lower support 16 under the action of the The plunger 30 have been moved by the forces transmitted by the drive assembly 46.

After a hole has been punched in the workpiece 22, the ram 30 is withdrawn. While With the initial retraction of the ram 30, the workpiece 22 is against the lower support 16 down to strip it off the punch 26 as it is withdrawn. on in this way, once the plunger 30 begins its upward thrust, the upper spring plate 52 moves from the lower spring plate 54 upwards, the springs 90 being relaxed. When the springs 90 are relaxed, they push the lower plate 54 downwards with a force sufficient to release the Stripping plate 36 to press firmly against the workpiece 22. The springs 42 and the springs 62 remain therefore under the action of the pins 60, guide pins 66, the driving plate 74 and the Stripping pins 40 transmitted forces in the compressed position.

When the upper spring plate 52 makes contact with the heads 98 on the guide pins 92: n, the front end 78 of the punch 26 has been pulled past the front surface 80 of the locking column 36. Accordingly, the workpiece 22 has been completely stripped from the punch 26. , Further upward movement of the plunger 30 has the advantage that v, both the upper and the lower spring plate 52 and 54 move together from the lower carrier 16 upwardly away result. This releases the stripping plate 36 so that it can move upward under the action of the springs 42 to come into contact with the upper bracket 14. If the plunger 30 is withdrawn further, the pins 60 are moved axially upwards into the position shown in FIG. 1 under the action of the springs 62. Finally, the top spring plate 46 60 f>^r> from the upper ends of the Stifle.

The Abstreifmcchanis rus is therefore optionally between an operating state in which the stripping plate 36 presses the workpiece 22 against the lower carrier 16 pushes when the punch 26 is withdrawn, and an inoperative state in which the stripping plate 36 does not press workpiece 22 against the lower beam when punch 26 is retracted becomes, operable. To the stripping device 10 between the operating state and the inoperative state To operate, the transfer device 48 is selectively switched between an active state (Fig. 2), in which they of the drive assembly 46 none Forces on the hold-down 34 transfers. The transmission device 48 is between the active State of FIG. 2 and the inactive state of FIG. 3 by a piston and cylinder Arrangement 102 powered.

When the transfer device is in the active state 48, the pins 60 are with the pins 66 in axial alignment position as shown in Fig. 1, to the hold-down 34 7> \ transmitted from the drive assembly 46 forces on the pins 66 and. The transfer device 48 is brought into the inactive state in that the working piston 102 is extended to transversely move the pins 60 into the inactive position of FIG. 3, in which they are axially offset with respect to the pins 66. When the transfer device 48 is in the inactive state of FIG. 3, a downward movement of the lower spring plate 54 presses the pins 60 only axially downwards into the holes 108 formed in the rotatable part 70. Therefore, this downward movement of upper pins 60 does not cause downward movement of pins 66 and drive plate 74 to extend stripper plate 36 against the force of springs 42.

In order to move the pins 60 between the active position of FIGS. 1 and 2 and the inactive position of F i g. 3, the pins are slidably mounted in sleeves 112 on a rotatable part 114, which is rotatably mounted on a plunger sleeve 116, the Part 114 has a drive arm 118 that connects to a piston rod 120 of the piston and cylinder assembly 102 is articulated. Thus, when the piston and cylinder assembly 102 is in the retracted Position of Fig.2 into the extended position of Fig.3 is moved, the part 114 is about the longitudinal axis of the Plunger 30 rotated, thereby the upper pins 60 with the holes 108 in the rotatable part 70 axially to be aligned. As soon as the upper pins 60 are in the axial alignment with the holes 108 are located, the transmission device 48 can no longer force from the drive assembly 46 to the Downholder 34 transferred so that the stripping plate 36 in the in F i g. I remains in the retracted position when the plunger 30 and the punch 26 be extended. Of course, once the piston and cylinder assembly 102 is withdrawn, the rotatable part 114 from the position of FIG. 3 into that of F i g. 2, thereby turning the pins 60 in to move back the axial alignment with the pins 66. A pin 124 which is integral with the drive head and fits into an arcuate slot 126 in the rotatable part 114 extends into it leads the movement of this part between the active position of F i g. 2 and the inactive position of FIG. 3.

To carry out fine automatic operation of the turret punch press and stripping control 132 are numerical Control devices 130 (Figure 4) are provided. the Numerical control devices 130 include

known reader 134 for a punched tape 136. During the operation of the turret punch 12, the stripping device t0 is between the operating state and the non-operational state operated in accordance with a program specified on the punched tape 136. As a result, signals from the tape reader 134 to the numerical controller 138 for the Turret punch 12 transmitted, which indicate whether the stripping device IO during a certain . The punching process is to be kept in or out of operation.

The numerical control 138 activates the ram control 142 in accordance with these signals in order to set the piston and cylinder arrangement 102 in motion as soon as the stripping device 10 / between successive punching processes / between the operating and the inoperative state is to be operated. To prevent the turret punch 12 / ti from working when the transfer arrangement 48 is only partially between the active position of fi g. 2 and the inactive position of Γ i g. J has been switched, and in order to produce an indication of the location or the state of the transmission arrangement 48, scanning switches 150 and 152 are mounted on the rotatable part 70 (see FIGS. 2 and i) in order to determine the location of the in relation to determine the part 70 rotatable part 114. Thus, when the rotatable portion 114 is in the active position of FIG. 2, the normally open limit switch 152 is closed by a cam 154 which is mounted on this part 114. Similarly, when the rotatable portion 114 is in the inactive position of I i g. 3, the normally open limit switch 150 is closed by a cam 158 on this part 114. The sensing switches 150 and 152 work together with the slide control 142 (see FIG. 4) to create a lock that makes it impossible for the turret punch 12 to begin a punching operation until one of the sensing switches, ie Either switch 150 or switch 152 is closed, which of the finder switches 150 and 152 must be closed, of course, depends on the program recorded on the punched tape 136.

From the above it follows that a stripping device 10 is created, which is optionally between a active position in which it presses a workpiece 22 onto the emc-bearing surface as soon as the punch 26 is withdrawn from the workpiece, and one

r, inactive position in which the workpiece is not against the bearing surface presses when the punch 26 is withdrawn, is adjustable.

To the stripping device 10 between the

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To set movement, the piston and cylinder assembly 102 is actuated, whereby the rotatable part 114 is set in rotation, thereby wiping the pins 60 / wiping an active position in which they are connected to the pins 66 axially align to from the drive assembly 46 on

2- to transmit force to the hold-down device 34, and one inactive position in which the pins are axially offset with respect to the pins 66 to move. In the inactive vii position, the upper pins 60 are not in the Location of the drive assembly 46 force on the

to be transferred to hold-down 34. The movement of the stripping device 10 between the operating and the Out of control can be advantageous with the help of Control numerical controller 130 for punch 26, and / was according to one on a punched tape 136 established program.

For this purpose 2 sheets of drawings

Claims (1)

Claim: Stripping device on a revolver punch with a movable up and down in a die Hole punch and a hold-down device acting as a stripper for the workpiece, characterized in that that between the ram drive and the hold-down device (34) one of two superimposed, mutually rotatable parts (70, 114) existing mechanical Transmission device is provided, the parts (70, 114) with coaxial, centric to the plunger (30) arranged pins (60,66) are provided, and the lower part (70) between the pins (66) holes (108) in which the upper pins (60) can be received.