EP0773077B1 - Press with combined transfer device - Google Patents

Description

Field of the Invention

The invention relates to a press with several press stations for serial processing preferably larger Sheet metal parts in the press stations running along a Transport direction are arranged.

Technical background

For presses with several in a row in the direction of transport arranged press stations will be accordingly workpieces to be machined, usually larger metal sheets, passed on from press station to press station and experience another in each of these press stations Machining so that the workpieces at the exit of the press arrive from sheet metal by multiple forming and / or cutting have been produced. The resulting Workpieces differ in their outer Shape and in its dimensions quite significantly from that of Sheet metal fed to the press.

In presses of this type there is usually a transfer device provided with the help of which in the successive processing stages increasingly deformed Workpieces from press station transported from press station become. The parts go through both Cutting and forming stations, the workpieces especially in the cutting stations in their outer contour can be changed significantly.

State of the art

DE 25 24 009 A1 discloses a device according to the preamble of claim 1.

From DE 25 24 009 A 1 a device for gradual transport of workpieces along several Stations of a press known that both cutting and Contains deformation stations. For transporting the workpieces serves a three-axis transfer device, the two pairs of gripper rails having. The gripper rails of the first Gripper rail pairs are in a relatively large side Spaced from each other and used for transport of relatively wide workpieces, for example during the introduction the same in a cutting station. The slightly lateral Gripper rails arranged at a distance from each other below the die of a press station concerned and serve to accommodate a cut out, down through the die passed through the workpiece. Both those in large lateral distance from each other arranged gripper rails as well as those closely spaced parallel to each other Gripper rails extend over several press stations. The gripper rails guide the workpieces a cyclical longitudinal movement. To record and Releasing the workpieces is a drive device provided by means of which the gripper rails of each Gripper rail pair towards and away from each other are movable. The drive device is designed so that the transverse movement of the Gripper rails in the opening and closing sense synchronously he follows. The gripper rails arranged at a greater distance go through a larger path than that in smaller spaced gripper rails. A gear transmission represents the relation between both movements for sure.

In this transfer device are in the matrices corresponding recesses for the passage of the gripper rails required. In addition, by the total four gripper rails guided parallel to each other considerable space required.

Summary of the invention

Based on this, it is an object of the invention, a Press with an automatic transfer device Create workpieces from press station to press station, which enables a space-saving design.

According to the invention defined in claim 1 is one for a press with several press stations Transfer unit provided in a first press area two essentially parallel to each other and parallel gripper rails arranged to the transport direction has, which are equipped with gripper means. Moreover are driving means interacting with these gripper rails provided, by means of which the gripper rails on top of each other to and from each other as well as with one another constant Distance at a right angle to the direction of transport lying direction and finally in the transport direction are movable. The transfer unit also has two in transport rails arranged in a second press area, which follow the gripper rails in the direction of transport and spaced parallel to each other, and second Drive means on. By means of the drive means are Transport rails at a constant distance from each other in one direction perpendicular to the direction of transport as well as movable in the transport direction, the gripper rails Traverses arranged transversely to the transport direction wear that are provided with gripper means.

Accordingly, the press is equipped with a transfer device provided the two are essentially independent of each other contains working transfer systems. The first transfer system is arranged by the two in a first press area Gripper rails formed that essentially parallel to each other and parallel to the direction of transport are arranged. This gripper rails can by the corresponding drive means moved both in the longitudinal direction what corresponds to the actual transport movement, as well as in the lateral direction, i.e. towards each other and away from each other, as well as in the vertical direction, with constant distance moved perpendicular to the transport direction become. The latter movement is usually one Lifting and lowering movement, which takes place in the vertical direction. This movement is used to lift workpieces out corresponding matrices or the insertion into them. The lateral movement component serves to open and close, the gripping means carried by the gripper rails engaged with the workpiece when closing and be separated from the workpiece when opening. The Transport movement is thus carried out with approximated Gripper rails while returning with each other removed gripper rails.

This section of the transfer system serves first Line the transport of the workpieces through press stations, in which the workpiece in its outer contour originally sheet metal introduced into the press is still largely is similar. It is particularly important that the dimension transverse to the transport direction, i.e. the width of the workpiece and thus the outer edges of the matrices in question are not too far apart in this area.

In the second press area are instead of the gripper rails Transport rails arranged by trusses are interconnected. The crossbeams carry gripper means such as suction devices, suction spiders or the like. The transport rails are with drive means provided that this both a lifting and lowering movement can also give a feed movement. During the the normal operation of the press changes the distance of the Not transport rails to each other.

The section formed by the transport rails Transfer system extends through a press area, in the matrices, i.e. Sliding tables with a larger width, or with a greater lateral distance between the outer edges, required are. Such matrices or sliding tables are particularly arranged in press areas in which Cutting stations are provided or those on cutting stations consequences. Become several from one sheet of metal Workpieces separated in parallel to each other by subsequent ones Press stations to be clocked may be required Total width of the press compared to a company with pure three-axis transfer can be reduced. The workpieces are by the gripper means attached to the trusses For example, taken from above, so that there is no space for the Gripping means working from the side or sideways for themselves moving gripper rails is required. The matrices and Sliding tables can therefore be available in this area Use the full width in the press.

In contrast, in the first press area in Transport direction available length optimal used. Because of the possible side access of the Gripper means for the workpieces are no waiting positions for any longitudinal sections serving gripper means required between the press stations.

The one from a three-axis transfer device and one Transfer device with trusses combined transfer unit thus allows for a given machining sequence a very compact press with a rectangular overall Build floor plan with both the cross to the direction of transport measured width as well as the length to the Transport direction measured length are minimized. The press with the said transport device is therefore of theirs Dimensions compact and therefore inexpensive to manufacture.

The drive means are advantageously designed so that the gripper rails and the transport rails are movable independently of one another. This allows the Return of the three-axis transfer from the gripper rails is formed when the transport rails, which form a two-axis transfer, in the park position are.

The gripper rails are by two drive units driven. One is a lifting and closing device, which the lateral movement of the gripper rails as well controls their lifting and lowering movements. The other is one Feed device that moves the gripper rails in the direction of transport emotional. This separation into different drive units enables the optimal design of the respective drive device for the given purpose. This allows for the different directions of movement the respective occurring movement curves are optimized and thus the accelerations are minimized. For decoupling the longitudinal movement of the gripper rails from their lifting and A linear guide can serve transverse movement, the Then gripper rail with a telescopic device the lifting and closing device is connected.

The gripper means carried by the gripper rails can be attached to separate supports attached to the Gripper rails are releasably attached. This makes it possible in a simple way, when changing tools To exchange gripper means.

The same applies to the trusses, which also with the Transport rails can be detachably connected. To do this Coupling agent used at a side, after outward movement of the transport rails the trusses uncouple them.

One can also be used for the transport movement for the transport rails provided drive device and a separate drive device may be provided, which Lifting and lowering the transport rails according to the predetermined transfer curve accomplished. In addition, the performing the lifting and lowering of the transport rail Device designed as a lifting and closing device be that the transport rails also a side Can give movement by means of which the transport rails are separable from the trusses.

A good use of space results when the distance the transport rails from each other are substantially the same The distance between the gripper rails is when they are in their furthest apart position. At this Design results in both machine sections of the maximum available for the sliding tables or dies standing space.

The gripper rails belong to a first transfer device, which preferably in one, based on the Transport direction, upstream area arranged is, in which deep drawing stations or the like are often used Forming stations are arranged. The the transport rails containing section of the transfer device is preferably downstream in the area of singling or Cutting stations. That of the two transfer devices traversed motion curves can each be optimized separately be, it is advantageous if the movements are coordinated. That by nature from a somewhat slower second transport device with the Trussing is designed for maximum speed, if the resulting accuracy is sufficient. The Speed can range from 15 to 16 strokes per minute. Meanwhile, the speed potential can be higher having the first transfer device with the Three-axis transfer for maximum precision or minimum Energy consumption can be designed.

Although it is possible in principle over the length of the Press several, i.e. more than two transport devices to be provided, each as required as a three-axis transfer device with gripper rails or as transfer devices are designed with transport rails and trusses it is useful for most applications, only to provide two separate transfer devices, with both the gripper rails and the transport rails each over several press stations extend.

One regarding the positioning of the items to be transported Workpieces variable and versatile press results when the gripping means provided on the crossbeams slidable transversely to the transport direction on the Trusses are stored. To position it accordingly To reach the gripper means are the gripper means each connected to an adjustment device, the one targeted movement of the relevant gripper means in relation on the traverse. If in a cutting station For example, several individual parts are cut out of a workpiece have been, they can by means of the gripper means be brought to the appropriate lateral distance and in subsequent forming stations at a spatial distance to be processed to each other.

Brief description of the drawings

Fig. 1

eine Presse mit mehreren Pressenstationen und einer ersten, als Dreiachstransfervorrichtung ausgebildeten Transfereinheit, sowie mit einer zweiten, als Saugerbrückentransfervorrichtung ausgebildeten Transfereinheit, in schematisierter, ausschnittsweiser und teilweise aufgebrochener Darstellung,

Fig. 2

eine stark schematisierte, ausschnittsweise Darstellung der Presse in Draufsicht, in einer ersten Arbeitsposition, und schematische Darstellung der von den Transfervorrichtungen durchlaufenen Transferkurven,

Fig. 3

eine schematisierte Darstellung der Presse nach Fig. 2, in einer anderen Arbeitsposition,

Fig. 4

eine schematische Darstellung der Presse nach Fig. 2 und eine diagrammartig veranschaulichte Darstellung der Transferkurve, in einer weiteren Arbeitsposition, und

Fig. 5

eine schematische Darstellung der Presse nach Fig. 2, in einer letzten Arbeitsposition, die der in Fig. 2 dargestellten Arbeitsposition vorangeht.

In the drawing, an embodiment of the invention is shown. Show it:

Fig. 1

a press with a plurality of press stations and a first transfer unit in the form of a three-axis transfer device, and with a second transfer unit in the form of a suction bridge transfer device, in a schematic, partial and partially broken-open representation,

Fig. 2

2 shows a highly schematic, partial representation of the press in a top view, in a first working position, and a schematic representation of the transfer curves traversed by the transfer devices,

Fig. 3

3 shows a schematic representation of the press according to FIG. 2, in a different working position,

Fig. 4

a schematic representation of the press of FIG. 2 and a diagrammatic illustration of the transfer curve, in a further working position, and

Fig. 5

a schematic representation of the press of FIG. 2, in a last working position, which precedes the working position shown in Fig. 2.

Description of the preferred embodiment

The press shown in Fig. 1 is a multi-stage transfer press 1 with a total of four successive press stages 3, 5, 7, 9. To each Press stage 3, 5, 7, 9 belongs to a die as well as one further shown up and down movable plunger, the a corresponding drive unit from that Matrix is moved away or to this force-operated. The plungers are guided in a machine frame and by driven by a drive device that only schematically indicated columns 11, 12, 13 and by is supported by other columns, which in Fig. 1 only by their floor plans 15, 16, 17 are indicated. The pestles and so that press stages 3, 5, 7, 9 work in unison.

Not belonging to each press level 3, 5, 7, 9 further shown matrices are on sliding tables stored, each with a corresponding base frame 19, 20 heard. On this are the sliding tables on the side, i.e. in the Z direction indicated by the XYZ axis movable and lockable if necessary. For further transport of workpieces by a feed device 22 introduced into the multi-stage transfer press 1 have been used, a transfer unit 24 serves a first Transfer device 26 and a second transfer device 27 contains. The first transfer device 26 is related to FIG that indicated by the X direction of the XYZ axis Transport direction arranged upstream while the second transfer device 27 based on this transport direction is arranged downstream. The transfer device 26 thus extends through a first section the multi-stage transfer press 1 and the second transfer device 27 through a second section. In the first Section of the multi-stage transfer press 1, i.e. in the Press stages 3 and 5, are forming steps the workpieces, such as deep drawing or the like. In the subsequent second section of the Multi-stage transfer press 1, i.e. in press stages 7 and 9, cutting operations, cutting operations as well if necessary, further forming steps are carried out.

The first upstream in the direction of transport X. Transfer device 26 is a three-axis transfer device formed and has two parallel to each other at a distance held gripper rails 31, 32 on the parallel are moved synchronously with each other. The gripper rails 31, 32 pass through to transport the workpieces a transfer curve, in the course of which they are in both X and can also be moved in the Y and Z directions. As Actual transport movement serving movement in the X direction is the gripper rails 31, 32 synchronously by a Feed device 34 issued, which in Fig. 1 only is indicated schematically. For adjusting the gripper rails 31, 32 in the lateral direction, i.e. to move the Gripper rails 31, 32 in the Z direction, and for adjustment in Y direction, i.e. for synchronous lifting and lowering of the gripper rails 31, 32 serve one before and one after the base frame 19 of the relevant sliding table Lock case 36, 37.

The gripper rails 31, 32 are provided with grippers 39, which are arranged on corresponding supports 41, 42 are. If necessary, these are from the gripper rails 31, 32 separable.

For decoupling the longitudinal movement of the gripper rails 31, 32 in the X direction of their lifting and transverse movement in Y or. Each gripper rail 31, 32 is in the Z direction via a corresponding telescopic linear guide 44, 44a, 45, 45a connected to the respective lock box 36, 37. These ensure that the gripper rails 31, 32, as specified by the feed device 34, in Move with respect to the lock boxes 36, 37 in the longitudinal direction can.

The transfer device 27, however, is a sucker cross transfer trained and has two at a distance Transport rails 51, 52 held parallel to one another. The end of the transport rails 51, 52 are with a Feed unit 53 and each telescopic Linear guides 54, 54a, 55, 55a with locking boxes 57, 58 connected, essentially as lifting units operate. The transport rails 51, 52 are one below the other by transverse to the transport direction (X direction) and spaced-apart trusses 61, 62, 63 connected, the coupling means not shown releasably held on the transport rails 51, 52 are. For releasing the trusses 61, 62, 63 from the transport rails 51, 52 these are closed by means of the lock boxes 57, 58 in the Z direction from each other, the Release the crossbars 61, 62, 63 from the transport rails 51, 52. The feed unit 53 drives the transport rails synchronously in and against the X direction.

The traverse 61 can be moved with two in the Z direction Carriages 65, 66 provided, each vacuum gripper Wear 67, 68. The carriages are in the Z direction by means of a Drive device 69 adjustable.

The other trusses 62, 63 are structurally identical to the described traverse 61. The car concerned, vacuum gripper and drive devices are therefore without re-description and reference with the same to Differentiate with an addition "a" or "b" Reference numerals denote or not further detailed explained.

In the following description of how it works and determining the dimensions of the transfer devices 26, 27 of the multi-stage transfer press 1 is based on FIGS. 2, 3, 4 and 5, in which the multi-stage transfer press 1 is shown very schematically.

As can be seen from Fig. 2, the columns 12, 16 arranged lock boxes 37, 57 the separation point between the transfer devices 26, 27. The latter The upstream matrices are only schematic indicated and corresponding to the sliding table 19, of to which they are included, designated 19 '. Are similar the matrices downstream of the separation point according to the Sliding table 20, from which they are received, with 20 'or 20 '' and marked by a rectangle that is yours Outside outline suggests. The die 19 'serves, for example, for removal one on the workpiece marked W here Drawing edge and is relatively narrow. Because of that However, it is related to workpiece W existing edge the X direction is relatively long. In contrast, the die 20 ' e.g. separating, i.e. Cutting the workpiece W, in two workpieces to be processed further in the die 20 '' Wa and Wb.

The matrices 20 'and 20' 'have a larger transverse dimension, i.e. wider than the die 19 ''. The length measured in the transport direction (X direction) however, is less. During that released from the die 19 ' lateral clearance from the gripper rails 31, 32 claimed for their gripping and releasing movement in the Z direction the transport rails 51, 52 are in one kept far apart and give a maximum lateral space for the dies 20 ', 20' 'free. However there is a free space F between the matrices 20 ', 20' ', which enables individual trusses 61, 62 at one Working stroke assigned to the respective dies 20 ', 20' ' Bring pestle into waiting position. While the Transfer device 26 to the side of the die 19 ' The transfer device 27 uses the maximum space between the matrices 20 ', 20' 'anyway Installation space, so that the multi-stage transfer press 1 saves space and can be built compact, resulting in significant cost savings makes possible.

When operating the multi-stage transfer press 1 starting from one designated by A in FIG. 2 Starting position, in which the workpieces W in the positions are stored, the gripper 39 of the Move gripper rails 31, 32 outwards in the Z direction and thus separated from the workpieces W. This position, in which the grippers 39 are separated from the workpiece W or are separated, is in the characteristic of the transfer curve left part of the diagram in Fig. 2 with S and Fig. 3 shown. At the same time run through the transport rails 51, 52 a slight lifting / lowering movement in the Z direction as well as a movement against the X direction, which is the traverse 61 from its initial position A into one labeled P. and brings parking position shown in Fig. 3.

During the transport rails 51, 52 and thus the trusses 61, 62, 63 must rest during the press stroke, can the gripper rails 31, 32, the side of the Workpieces W have been separated and deal with their Grippers 39 are not in the press area, gradually to move a return point designated R in FIG. 2. This movement can be optimized for accuracy or energy expire.

4, the gripper rails can 31, 32 of the transfer device 26 starting from the return point R is an infeed movement in the Z direction start at the point G the grippers 39 with the next one Bring workpiece W into engagement, which in the die 19 ' lies. When this movement is finished, the gripper rails are standing 31, 32 in the position shown in FIG. 5. At the same time, the trusses 61, 62 begin from their in Fig. 4 shown parking position in a G to move designated gripping position. This essentially against the transport direction in the X direction Movement is a slight lifting / lowering movement in the Y direction overlaid. While the vacuum grippers 67, 68 with respect to the crossbeam 61 are at rest, the vacuum grippers 67A, 68A move towards one another in order to achieve the to be able to pick up lying workpiece W.

When the vacuum grippers 67, 68, 67A, 68A on the workpieces are lowered, is the one shown in FIG. 5 on the right Position of the transfer device 27 reached. Of this Starting position go through both the gripper rails 31, 32 of the transfer device 26 as well as the transport rails 51, 52 of the transfer device 27 a lifting-lowering movement. This transfers the workpiece W from the Die 19 ', that of the in the left half of the diagram of Fig. 4 corresponds to G designated gripping position in the Storage position, which is exactly above the lock boxes 37, 57 is located. This position is shown in FIG. 2 Diagram marked with an A in the middle. The the corresponding curve branch of the transfer movement is in FIG. 4 denoted by T. The same applies to the movement of the transfer device 27, the workpiece W from the storage position above the locking boxes 37, 57 into the die 20 ' transferred and thus to that designated in Fig. 2 with A. Starting point returns. The corresponding branch of the Transfer curve is labeled T. The one described so far Transport cycle of the transfer unit 24 is in the Machine cycle repeated cyclically.

For a press with several press stations 3, 5, 7, 9, preferably for serial processing larger Sheet metal parts is provided, is a transfer unit to Transporting the workpieces through the in the machining sequence press stations 3, 5, 7 arranged one behind the other, 9 provided. The transfer unit has a first, as Triaxial transfer trained section 26 and one second section designed as a cross-beam transfer 27 on. The three-axis transfer has a pair to each other parallel gripper rails with gripper means that pass through a lateral feed movement of the gripper rails with the Workpieces can be brought into and out of engagement. The gripper rails need a certain amount of lateral space. On the other hand, the cross-beam transfer requires parking positions between individual press stations in which the Crossbeams stop when the press stations are in operation. While in the first section of the press there is lateral clearance anyway in addition to the sliding tables are present in the second press section the parking positions for the cross members predictable because of the shorter dies without the Press to enlarge. The intricate combination of the Three-axis transfers made possible with cross-beam transfer an adapted, good use of space throughout Press area.

Claims (20)

1. Press (1) having a number of press stations (3, 5, 7, 9) for the serial processing of preferably relatively large sheet-metal parts (W) in the press stations arranged along a transport direction (X),

   having two gripper rails (31, 32), which are arranged in a first press area and are arranged essentially parallel to each other and parallel to the transport direction (X),

   having first drive means (34, 36, 37), by means of which the gripper rails (31, 32) can be moved towards each other and away from each other (Z), with a constant spacing in a direction (Y) at right angles to the transport direction (X) and in the transport direction (X),

   having first gripper means (39), which are borne by the gripper rails (31, 32) and can be brought into and out of engagement with workpieces (W),

   having two transport rails (51, 52), which are arranged in a second press area and are arranged at a distance from and parallel to each other, following the gripper rails (31, 32) in the transport direction (X),

      characterized by:

   second drive means (53, 57, 58), by means of which the transport rails (51, 52) can be moved, with a constant spacing from each other, in a direction (Y) at right angles to the transport direction (X) and in the transport direction (X),

   crossmembers (61, 62, 63), which are arranged essentially transversely with respect to the transport direction (X) and are held at the ends of the transport rails (51, 52),

   second gripper means (67, 68), which are provided on the crossmembers (61, 62, 63) which connect the transport rails (51, 52) to each other.
2. Press according to Claim 1, characterized in that the first drive means (34, 36, 37) and the second drive means (53, 57, 58) can be driven independently of one another.
3. Press according to Claim 1, characterized in that the first drive means (34, 36, 37) contain a lifting and closing device for the movement towards each other and away from each other (Z) and for the movement (Y) at right angles to the transport direction (X), during which movement the gripper rails (31, 32) do not change their spacing.
4. Press according to Claim 1, characterized in that the first drive means (34, 36, 37) contain a forward thrust device, by means of which the gripper rails (31, 32) can be driven in and counter to the transport direction (X).
5. Press according to Claims 3 and 4, characterized in that a linear guide (44, 45) is arranged between the lifting and forward thrust device (36, 37) and the gripper rail (31, 32) in order to decouple the forward thrust device (34).
6. Press according to Claim 1, characterized in that the gripper means (39) borne by the gripper rails (31, 32) are fixed to carriers (41, 42) which are detachably fixed to the gripper rails (31, 32).
7. Press according to Claim 1, characterized in that the crossmembers (61, 62, 63) are detachably connected to the transport rails (51, 52), it being possible for the crossmembers (61, 62, 63) to be detached from the transport rails (51, 52) by a movement directed away from one another (Z).
8. Press according to Claim 7, characterized in that the second drive means (53, 57, 58) contain a lifting and closing device for the movement towards each other and away from each other (Z) and for the movement (Y) at right angles to the transport direction (X), during which movement the transport rails (51, 52) do not change their spacing from each other.
9. Press according to Claim 1, characterized in that the second drive means (53, 57, 58) contain a forward thrust device by means of which the transport rails (51, 52) can be driven in and counter to the transport direction (X).
10. Press according to Claims 8 and 9, characterized in that a linear guide (54, 55) is arranged between the lifting and closing device (57, 58) and the carrier rail (51, 52) in order to decouple the forward thrust device (56).
11. Press according to Claim 1, characterized in that the gripper rails (31, 32) are located in their approached position, in a gripping position in which they are engaged with the workpieces (W), and in their position remote from each other, in a release position in which they are not engaged with the workpieces (W), and in that the spacing between the gripper rails (31, 32), when the latter are in the release position, essentially coincides with the spacing between the transport rails (51, 52).
12. Press according to Claim 1, characterized in that the gripper rails (31, 32) belong to a first transfer device (26) and the transport rails (51, 52) belong to a second transfer device (27), and in that the first transfer device (26) is arranged upstream of the second transfer device (27), as referred to the transport direction (X).
13. Press according to Claim 12, characterized in that the movement curve traced by the first transfer device (26) differs from the movement curve traced by the second transfer device (27).
14. Press according to Claim 13, characterized in that the movement curves are coordinated with each other.
15. Press according to Claim 13, characterized in that the first transfer device (26) is arranged in a press area in which the workpieces (W) to be transported have a smaller width, as measured transversely with respect to the transport direction (X).
16. Press according to Claim 13, characterized in that the first transfer device (26) is arranged in a press area in which the workpieces (W) to be transported have a greater length.
17. Press according to Claim 1, characterized in that the lifting movement (Y), which is to be executed with a constant spacing between the gripper rails (31, 32), and which is to be traced at right angles to the transport direction (X) of the gripper rails (31, 32), coincides in terms of its height with the corresponding lifting movement (Y) of the transport rails (51, 52).
18. Press according to Claim 1, characterized in that the gripper rails (31, 32) and/or the transport rails (51, 52) are in each case constructed so as to overlap a number of press stations (3, 5, 7, 9).
19. Press according to Claim 1, characterized in that the gripper means (67, 68) provided on the crossmembers (61, 62, 63) are mounted on the crossmembers (61, 62, 63) such that they can be displaced transversely with respect to the transport direction (X).
20. Press according to Claim 19, characterized in that the gripper means (67, 68) are each connected to an adjusting device (65, 66, 69), which permits a specific movement of the gripper means (67, 68) in relation to the crossmember (61).

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