WO2016124621A1

WO2016124621A1 - Energy guiding device and system for workpiece processing

Info

Publication number: WO2016124621A1
Application number: PCT/EP2016/052234
Authority: WO
Inventors: Markus DEISS
Original assignee: Trumpf Werkzeugmaschinen Gmbh + Co. Kg
Priority date: 2015-02-06
Filing date: 2016-02-03
Publication date: 2016-08-11
Also published as: DE102015101719B4; DE102015101719A1; CN107408804B; CN107408804A

Abstract

The invention relates to an energy guiding device and a system for workpiece processing using an energy guiding device for accommodation and guiding of at least one line, like a hose or a cable, between two connector end pieces (12, 14) which are moveable relative to one another, comprising a first strand (16) which accommodates the at least one conductor (13) and extends from the first connector end piece (12) up to a first connection end piece (17) which is connected to a connection element (18), comprising a second strand (20) which accommodates the at least one conductor and extends from the second connector end piece (14) up to a second connection end piece (19) which is connected to the connection element (18), wherein the connection element (18) accommodates and deflects the at least one conductor (13) between the first and second strand (16, 20) in a deflection plane (22) of the connection element (18), wherein the first connection end piece (17) of the first strand (16) and the second connection end piece (19) of the second strand (20) are arranged next to one another or above one another on the connection element (18) and the first and second strand (16, 20) can each be deflected in opposite directions starting from the connection element (18).

Description

Energieführungseinrichtung und Anlage Energy guiding device and system
zur Werkstückbearbeitungfor workpiece machining

The invention relates to an energy guiding device for receiving and guiding at least one line, such as a hose or a cable, between two relatively movable Anschlußendstücken and a plant for workpiece machining with a first and a second component, which are movable relative to each other, with such Energy management device are connected.

Such an energy guiding device is known from DE 10 2010 003 282 A1. This is designed as an energy guiding chain and serves for receiving and guiding at least one line, such as a hose or a cable, between two terminal connecting pieces of the energy guiding device which are movable relative to one another.

Such energy drag chains require in the initial state, in which the two Anschlußendstücke for example, one above the other, a considerable installation height due to the bending radius of the energy chain, which is determined by the individual chain links. This is often disadvantageous in recent developments of plants, as they are to be designed with a smaller space.

From DE 10 2013 211 523 B3 a further developed embodiment of an energy guiding device for a processing machine for workpiece machining is known. This energy guiding device also has two relatively movable terminal end pieces, wherein a first strand is provided which receives at least one line and extending from the first terminal end to a first connection end piece which is connected to a connecting element. Furthermore, a second strand is provided, which receives the at least one line and extends from the second terminal end to a second connection end piece, which is also connected to the connecting element. In this energy chain, the two connecting end pieces are arranged side by side on the connecting element, so that in a first working position of the energy guiding device, the two strands are adjacent and through the connecting piece a fixed U-shaped deflection for the at least one guided therein line is provided. For moving components of the processing machine relative to each other, the connecting element is first manually bent upwards, so that the strands are both semicircular in the same direction, and subsequently allow a relative movement of the components. Such an arrangement has the advantage that in a rest position a flat-building energy transmission chain is created because the two strands are adjacent.

The invention has for its object to provide an energy management device and a system for workpiece machining with such an energy management device in which a small amount of construction is given in a first working position and from this position directly a traversing movement is made possible in a second working position, which a large distance between the terminal ends.

This object is achieved by an energy guiding device, in which the two connecting end pieces of the first and second strand are arranged side by side or one above the other on the connecting element and the first and the second strand are deflected starting from the connecting element to the respective terminal end in each case in the opposite direction. Both the first and the second embodiment of the invention allow in a first working position in which the two strands next to each other or directly above each other, a low installation dimension in the installation height or width and allow easy travel to a second working position directly from the first working position out without the need for additional intervention or supportive measures.

Both embodiments of the invention have the advantage that the formation of a semicircular or a U-shaped arc can be omitted in conventional link chains between the two Anschlußendstücken and by the connecting element with the two juxtaposed or stacked connection end pieces a fixed deflection of at least one line in the connecting element is created, which allows both a flat construction arrangement in a first working position and the assumption of an example maximum travel in a second working position, which may also correspond to conventional energy chains. By deflecting in opposite directions strands different working heights as well as a maximum working height between the two mutually movable Anschlußendstücken can be controlled.

A preferred embodiment of the energy guiding device provides that the first connection end piece and the second connection end piece of the second strand are arranged next to one another on the connection element and the strands and the connection element lie in a common plane. Thereby, a first working position can be taken, in which the two strands are adjacent to each other and the installation dimension in height is determined by the height of the connecting element or the strand. The two terminal end pieces are thus also parallel to each other in the same plane as the connecting element, so that a very flat-building energy management device is given. On this basis, one of the two terminal end, for example, be moved vertically upwards, so that then a second working position of the energy guiding device can be taken, in which the second terminal end can be arranged at a same distance as in conventional energy drag chains, but in the first working position due to Forming a U-shaped arc through the chain links have a much higher dimensions.

An alternative embodiment of the energy guiding device provides that the first connection end piece of the first strand and the second connection end piece of the second strand are arranged one above the other on the connecting element and the strands can be arranged parallel one above the other in a first working position. In this second alternative embodiment, analogous to the former embodiment applies. Deviating is here only that in a first working position, the two strands lie directly above each other and therefore occupy only a small width and the installation dimension is formed by twice the height of the strand or by the two superimposed strands.

Furthermore, the first and second strand can preferably be transferred from the first working position into a second working position, which deviates from the first working position. The first and second strand are deflected in the second working position in the opposite direction. The first and second strand can be continuously transferred to different working heights starting from the first working position to take the second working position. Also, the first and second strand may be spaced far enough away from each other that a maximum working height is taken.

A displacement movement of the terminal end pieces of the energy guiding device is preferably provided in adjacent and arranged on the connecting element connection end pieces perpendicular to the deflection plane of the connecting element. As a result, on the one hand given in a starting position, a flat construction of two relatively movable relative to each other with respect to a vertical axis components, on the other hand can be given a forced movement of the energy guiding device in a movement of the one component to the other component. The same applies to the alternative embodiment of the energy guiding device, in which the connecting end pieces are arranged one above the other lying on the connecting element, wherein the movement of the terminal connection is provided along the deflection plane of the connecting element. In this embodiment, the deflection plane of the connection element is rotated by 90 ° to the above embodiment arrangement, that is, that the connection end pieces are movable parallel to the deflection plane. In the embodiment of the energy guiding device, in which the connecting end pieces abut one above the other on the connecting element, all the bending radii of the at least one wire received and guided in the energy guiding device lie in the same plane. In the other alternative embodiment of the energy guiding device, in which the connecting end pieces lie parallel to each other on the connecting element, in the region of the connecting element, the deflection plane of the at least one line is rotated by 90 ° relative to the deflection plane in the connecting end pieces.

An advantageous embodiment of the energy guiding device provides that the first and second strand is formed by an energy guiding chain with a plurality of chain links, which are articulated and angled away from each other, wherein the strands in a range from the respective connecting end to the middle of the entire length of the strand Have chain links which are movable against each other only in the one angular direction and in a range from the center to the terminal end chain links, which are movable only in the opposite angular direction. As a result, the first and the second strand each have an arrangement of chain links, which are angled in opposite directions to each other. As a result, the respective strand can each have a kind of S-shaped profile at a maximum spacing of the two connection end pieces. The middle region of a strand may be formed such that the chain links, which are movable in the one angular direction against each other, directly connect to the chain links, which are movable in the opposite angular direction. Likewise can be provided in between two lying in both angular directions bendable chain links or chain links in the central region, which are arranged rigidly to each other. The limitation of the deflection of the chain links against each other in an angular direction leads to a good torsional stability of the energy guiding device. In this way, the occurrence of such energy management device in a processing system prevents the occurrence of unwanted forces and achieves a high degree of movement accuracy.

It is preferably provided that the strands in a range from the respective connection end piece to the middle of the entire length of the strand chain links with an angled range to each other between 0 to 45 °, and in a range from the center to the terminal end chain links with an angled Range between 0 to - 45 °, to take the S-shaped course of the energy chain. The chain links can all allow the assumption of the same angular position or a same bending angle. Likewise, the bending angle between the individual chain links may differ from each other. Preferably, in the middle region of the strand, individual chain links may also be rigid.

According to a further preferred embodiment of the invention, it is provided that the first and second strand taken in a positioning of the terminal end pieces away from each other in the second working position from the side taking the form of a curly bracket. By such an arrangement, a secure guidance of the at least one line is given in the energy guiding device, wherein in particular in the connecting element, in which the line is immovably arranged, this may have a narrower bending radius than between the connecting end pieces and the connecting element.

A further preferred alternative embodiment of the energy guiding device provides that the first and second strand are each formed by a rigid support and connected by at least one joint to the connecting element and to the respective terminal end piece. As a result, the shape of a staircase or a zig-zag arrangement can be assumed at a maximum spacing of the connection end pieces after transferring the energy guiding device into the second working position from the side. Such carriers can be designed as an open or closed guide channel.

In the embodiment of the energy guiding device, in which the strands are formed by a rigid support, it is preferably provided that the joints on the connecting element and / or terminal end have a stop for the deflection movement of the strands, which the pivoting mobility to a range of less than 90 ° restrict. This can ensure that a permitted bending radius of the lines routed in the strands is not undershot.

A further advantageous embodiment of the invention provides that the connecting element is designed as a U-shaped chain link or as a plate or as a housing to which the respective end pieces of the strands are connected. Such embodiments enable a defined recording and a permanently held deflection and bending of the at least one line.

The object underlying the invention is further achieved by a system for workpiece machining, which has a first and second component which are movable relative to each other from a first working position to a second working position. At least one line attached to the first component and to the second component for conducting energy is guided by means of a power conducting device. The energy management device includes a first terminal end engaging the first component and a second terminal end engaging the second component, a first strand extending from the first terminal end to a first connection end, and a second strand extending from the second terminal end extends to a second connection end piece, and both connection end pieces are connected to a connection element. The two connecting end pieces are juxtaposed or superimposed on the connecting element. The first and the second strand can be deflected on the connecting element in each case in the opposite direction to the connecting element. As a result, in a first working position of the first and second components, the energy guiding device can occupy a small installation space, since the strands lie next to one another in parallel or directly parallel to one another. The energy guiding device can be transferred after a movement between the first and the second component in a second working position and occupy a maximum working height, as is possible, for example, in conventional power management. Since the energy supply device in the first working position requires a small height, the entire space of the workpiece processing machine can be reduced, since the distance between the first and second component can be reduced.

According to a preferred embodiment of the system for workpiece machining, it is provided that in the first working position, the strands and the connecting element of the energy guiding device are located in a common plane with adjoining connecting end pieces on the connecting element. Thereby, the total installation height is determined solely by the height of the strands, wherein the height of the terminal end pieces and the connecting element preferably corresponds to the height of the strands. When parallel to each other on the connecting element arranged connecting end pieces in the first working position corresponds to the installation height of the height of the two superimposed strands.

In a second operating position of the energy guiding device, the terminal end pieces of the first and second strand, which are each arranged on a component, preferably occupy an extension height which is greater than the common height of the first and second strand in the first working position. At a maximum travel distance of the terminal end pieces away from each other, a maximum extension height or a maximum extension distance is assumed.

According to a preferred embodiment of the system, it is provided that during a movement movement of one of the two connection end pieces from the first to the second working position, the connecting element forcibly moves at half the travel speed to the travel speed of the connection end pieces. This is especially true in strands of equal length.

Furthermore, it is preferably provided that the two strands of the energy guiding device are designed to be of equal length, so that during the movement of movement of the first and / or second component, the connecting element occupies a position at half the height to the extension height between the two Anschlussendstücken the energy guiding device. Due to the preferably torsionally formed strands takes place during such a movement a forced operation of the connecting element, so that this is also lifted off. The stability of the strands against torsion is made possible by the design of the strands, for example by the geometry of the chain links and their articulated connection or by the use of a rigid support, so that an additional guide for the connecting element during a movement movement of the energy chain between the first and second job can be omitted.

The invention and further advantageous embodiments and developments thereof are described in more detail below with reference to the examples shown in the drawings and explained. The features to be taken from the description and the drawings can be applied individually according to the invention individually or in combination in any combination. Show it:

FIG. 1 shows a perspective view of a first embodiment of the energy guiding device according to the invention in a first working position,

FIG. 2 shows a perspective view of the energy guiding device according to FIG. 1 in a second working position,

FIG. 3 a shows a schematic side view of the embodiment according to the invention according to FIG. 1 in the first and second working position,

FIG. 3b shows a schematic side view of a prior art energy-conducting device in a first and second working position,

FIG. 4 shows a perspective view of an alternative embodiment of the energy guiding device in a first working position analogous to FIG. 1,

FIG. 5 shows a schematic side view of the energy guiding device according to FIG. 4 in a second working position,

Figure 6 is a perspective view of another alternative embodiment of the energy guiding device and

7 shows a schematic view of a system for workpiece machining with an energy guiding device according to FIG. 1.

FIG. 1 shows a power-conducting device 11 for guiding at least one line 13, in particular of supply lines such as a hose, a cable or the like, between two

connection end pieces

12, 14, which are each attached to components 28, 29 (FIG. 7) which are movable relative to one another can. These

components

28, 29 may be components of a system 30 for workpiece processing, such as a laser processing machine, as will be described below with reference to Figure 7.

The energy guiding device 11 comprises a first strand 16, which extends from the first connection end piece 12 to a first connection end piece 17, which is arranged on a connecting element 18. Between the second connecting piece 14 and a second connecting end piece 19, the second strand 20 is provided, which is fastened to the connecting element 18 via the second connecting end piece 19.

According to a first embodiment of this energy guiding device 11 in Figure 1, this is designed as a power transmission chain, in which the

strand

16, 20 is formed of a plurality of chain links. Such composed of individual chain links cable drag chains are known for example from DE 10 2010 003 282 A1. The connecting

pieces

12, 14 and the connecting

end pieces

17, 19 are formed as chain links or have connections for tying the

strands

16, 20. These may be chain links, as are known from DE 10 2010 003 282 A1. Likewise, other well-known chain links may be provided which have a support shell comprising an interior running in the longitudinal direction of the support shell for receiving and guiding the at least one duct 13 therein. For example, such chain links may have a rectangular cross-section, which may for example comprise a closed frame or a U-shaped frame which can be closed by a web. Such chain links are articulated to each other via articulated joints on the side edges, so that they are angled at a predetermined angle to each other. It can be provided that the angular range is limited by the shape of the side walls of the chain links to a predetermined angle. In this way it is ensured that a minimum permissible bending radius of the line is not undershot. Due to the preferred rectangular configuration of the support jacket and its articulated arrangement of the individual chain links on the side walls of such energy supply chain can be unrolled and deflected in only one spatial direction, that is, this energy chain can escape either side nor a rotation along the longitudinal axis between a

connector

12, 14 and a

connection end piece

17, 19 and thus allows a positive guidance of the connecting element 18 in one direction.

The

terminal end pieces

12, 14 can be adapted with respect to their connection surfaces 21 to the respective mounting situation for attachment to the

components

28, 29, that is, the

terminal end pieces

12, 14 can be arranged interchangeably on the

strand

16, 20. The same applies to the connecting

end pieces

17, 19, which form a connection between the

strand

16, 20 to the connecting element 18, wherein according to a preferred embodiment, the connecting

end pieces

17, 19 correspond to a chain link of the

strand

16, 20 and the connection of the connecting element 18 is adjusted accordingly.

The connecting element 18 is formed in the embodiment shown in Figure 1 as a housing which receives the connecting

end pieces

17, 19 adjacent to each other, so that between the connecting end pieces a fixed U-shaped arc for the at least one line 13 for deflecting one is given to the

other strand

16, 20. The line 13 is deflected in a deflection plane 22 in the connecting element 18. Alternatively, the connecting element 18 may also be designed to be open or comprise a support frame or consist only of a plate to which the connecting

elements

17, 19 can be connected.

In Figure 1, the two

strands

16, 20 and the

terminal end pieces

12, 14 are parallel to each other. In the same plane and the connecting element 18 and the attacking connecting

end pieces

17, 19 are provided. This arrangement of the energy guiding device 11 can correspond to a first working position 23 (see FIG. 3 a), whereby the installation height of the energy guiding device 11 is determined and limited by the height of the components of the energy guiding device 11.

In FIG. 2, the energy-conducting device 11 according to FIG. 1 is arranged in a second working position 24. The

terminal end pieces

12, 14 are arranged at a maximum distance from each other. The energy guiding device 11 advantageously takes the form of a curly bracket viewed from the side. This is based on the fact that the two

strands

16, 20 are each deflectable in the opposite direction to the connecting element 18. In addition, it can be provided that the strand 16 of the Anschlussendstück 12 to the middle of the strand 16 chain links, which are angled at an angle between 0 to 90 °, preferably 0 to 45 ° to each other and from the middle of the strand 16 to the Connector 17 chain links which are angled in an opposite angular range, for example at an angle of 0 to - 90 °, preferably 0 to - 45 °. As a result, the S-shaped profile can be assumed starting from the connection end piece 12 via the strand 16 to the connection end piece 17 and connecting element 18. The same applies of course to the second strand 20 and the second connection end 14 and connection end piece 19.

Preferably, the angled areas provided within the

strand

16, 20 are of the same design, so that the energy guiding device 11 can assume a symmetrical course. At very high extension heights or

long strands

16, 20 middle portions of the

strands

16, 20 may be non-articulated, but stiff, so that a bending radius only directly to the

terminal end

12 and 14 and to the connecting

end piece

17 and 19 respectively followed.

In the arrangement of the first and

second strand

16, 20 adjacent to each other in a common plane, the connecting element 18 is forcibly moved when transferring the second terminal end piece 14 in the maximum extension height, so that this occupies a position at half height to the maximum extension height, wherein the orientation of a deflection plane 22 of the connecting element 18 in both the first and second working

position

23, 24 remains the same.

FIG. 3 a shows a schematic side view of the inventive energy guiding device 11 according to FIGS. 1 and 2. FIG. 3b shows an energy guiding chain 11 'according to the prior art, such as for example according to DE 10 2010 003 282 A1. In a first working position 23, the energy guiding device 11 assumes a height of H _min , wherein this energy guiding device 11, as shown in Figure 1, two juxtaposed

strands

16, 20 has. After transferring to the second working position 24, the maximum extension height H _{max is} assumed. By comparing the conventional energy guiding chain 11 ', it can be seen that in the first working position 23, the height H _{min of} the energy guiding chain 11' is determined by the deflection radius of the individual chain links and thus is a multiple compared to the energy guiding device 11 according to the invention. In the second working position 24, the same maximum extension height H _{max can be} assumed in the energy guiding chain 11 'according to FIG. It is obvious that the inventive energy guiding device 11 allows a considerably reduced construction volume when arranged in the first working position 23 and a direct method from the first working position 23 into the second working position 24.

FIG. 4 shows an alternative embodiment of the energy-conducting device 11 to FIG. In the following, only the deviations will be discussed. Otherwise, the statements on the above figures apply.

The connecting element 18 is formed in Figure 4 such that the two connecting

elements

17, 19 can be arranged lying directly above one another and fastened to the connecting element 18. This has the consequence that both the

strands

16, 20 and (with equal length strands 16, 20), the respective connecting

pieces

12, 14 directly above one another lying or stacked in a first working position 23, as shown in Figure 4, are provided , The deflection plane 22 also extends as in FIG. 1 along the two connection openings on the connection element 18 for the

connection end pieces

17, 19, but this is rotated by 90 ° relative to that in FIG. The at least one line 13 is deflected along this deflection plane 22.

FIG. 5 shows a schematic side view of the alternative embodiment of the energy guiding device 11 according to FIG. 4 in the second working position 24. This energy guiding device 11 according to FIG. 5 can likewise assume the contour of a curly bracket in the second working position 24 viewed from the side. The mode of operation of this energy-conducting device 11 corresponds to the first embodiment of the energy-conducting device 11 according to FIGS. 1 and 2.

FIG. 6 shows a perspective view of a further alternative embodiment to FIG. This embodiment differs from that shown in Figure 1 in that the

strands

16, 20 are formed by rigid supports having retaining members (e.g., retaining clips, not shown) for attachment of the lead 13. Alternatively, the carriers may be formed as a closed channel. Also, an open channel may be provided, which is closed by a cover or webs. Between the connecting

pieces

12, 14 and the

strands

16, 20 joints 26 are provided. Likewise, 18 further joints 27 are provided between the

strands

16, 20 and the connecting element. As a result, an analogous function of the energy guiding device 11 is achieved as in the embodiment according to FIGS. 1 and 2 with the difference that in the second working position 24, viewed from the side, a zigzag-shaped contour of the energy guiding device 11 is assumed.

The joint 27 is preferably limited in its pivoting range, so that it has, for example, a pivoting range of at most 45 °.

FIG. 7 schematically shows, by way of example, a perspective view of a system 30 for machining workpieces.

The system 30 can be designed as a laser processing machine, in particular a laser cutting machine. Alternatively, this can also be designed as a plasma cutting machine or Brennstrahlschneidmaschine. The component 28 is a component of a machine base frame in the example shown. The component 29 forms a workpiece support which receives at least one plate-shaped material 31. A cutting jet 32 is directed to the plate-shaped material 31 via a cutting head 34 to machine it and to produce one or more workpieces 34. The cutting head 34 is movable by a linear axis system 36 within a working space.

Such a plant 30 for workpiece processing may also be an automation machine, which is upstream or downstream of a processing machine, for example, to supply workpieces to this processing machine in an automated manner or to remove them after processing.

In such a system 30 for workpiece machining, for example, the second component 29 by means of a motor, not shown, relative to the first component 28, in particular along a guide 37, movable. In this case, it is necessary for the at least one energy-conducting or media-carrying line 13 to be carried along during a movement movement of the first or

second component

28, 29. For safe guidance of the guided between the

components

28, 29 at least one line 13, the energy management device 11 is provided according to one of the embodiments described above, wherein in Figure 7, the embodiment of the energy guiding device 11 is shown by way of example in FIGS. 1 and 2.

FIG. 7 shows a schematic view of the first and

second component

28, 29 in the second working position 24 of the energy guiding device 11, in which a maximum extension height is assumed. In the first working position 23, the energy-conducting device 11 is arranged analogously to FIG. 1 or 3 a, so that the first and

second components

28, 29 are spaced from one another by only a small distance in height. Likewise, the

terminal end pieces

12, 14 in an alternative design of the system 30 on the first and

second component

28, 29 may be laterally mounted such that the first and second components can be arranged in a first working position 23 with respect to their working planes in a common plane.

Claims

Energy guiding device for receiving and guiding at least one line (11), such as a hose or a cable, between two connection end pieces (12, 14) which are movable relative to one another,

- having a first strand (16) receiving the at least one duct (13) and extending from the first connection end piece (12) to a first connection end piece (17) connected to a connection element (18),

- having a second strand (20) receiving the at least one conduit and extending from the one second terminal end (14) to a second connection end (19) connected to the connecting element (18),

- wherein the connecting element (18) receives and deflects the at least one line (18) between the first and second strand (16, 20) in a deflection plane (22) of the connecting element (18),

characterized,

- That the first connection end piece (17) of the first strand (16) and the second connection end piece (19) of the second strand (20) on the connecting element (18) are arranged side by side or one above the other and

- That the first and the second strand (16, 20) from the connecting element (18), starting in each case in the opposite direction are deflected.
Energy guiding device according to claim 1, characterized in that the first connecting end piece (17) of the first strand (16) and the second connecting end piece (19) of the second strand (20) on the connecting element (18) in a first working position (23 ) are arranged side by side lying and the strands (16, 20) and the connecting element (18) lying in a common plane can be arranged.
Energy guiding device according to claim 1, characterized in that the first connecting end piece (17) of the first strand (16) and the second connecting end piece (19) of the second strand (20) on the connecting element (18) in a first working position (23 ) are arranged one above the other and the strands (16, 20) are arranged in parallel one above the other in a common plane can be arranged.
Energy guiding device according to claim 2 or 3, characterized in that the first and second strand (16, 20) from the first working position (23) in a second working position (24), which differs from the first working position (23) can be transferred and the first and second strand (16, 20) are deflected in the second working position (24) in the opposite direction.
Energy guiding device according to claim 1, characterized in that a movement of the Anschlußendstücke (12, 14) in adjacent and on the connecting element (18) arranged Verbindungsendstücken (17, 19) perpendicular to the deflection plane (22) of the connecting element (18) is provided and at one above the other and on the connecting element (18) arranged Verbindungsendstücken (17, 19) along the deflection plane (22) of the connecting element (18) is provided.
Energy guiding device according to one of the preceding claims, characterized in that the first and second strand (16, 20) is formed by a plurality of chain links which are hinged together and angled to each other, wherein the strands (16, 20) in a region of the respective Connecting end piece (17, 19) to the middle of the entire length of the strand (16, 20) chain links, which are movable in only one angular direction against each other, and in a range from the center to the terminal end piece (12, 14) chain links have, which are movable only in the opposite angular direction.
Energy guiding device according to one of the preceding claims, characterized in that the first and second strand (16, 20) in a positioning of the connecting pieces (12, 14) away from each other in a second working position (24) viewed from the side take the form of a curly bracket ,
Energy guiding device according to one of claims 1 to 5, characterized in that the strands (16, 20) are each formed by a rigid support or guide channel and by at least one joint (26, 27) with the connecting element (18) and with the respective terminal end piece (12, 14) are connected.
Energy guiding device according to claim 8, characterized in that the joint (27) on the connecting element (18) has a stop for a deflection movement.
Energy guiding device according to one of the preceding claims, characterized in that the connecting element (18) is formed as a U-shaped chain link or as a plate or as a housing, on which the respective connecting end pieces (17, 19) of the strands (16, 20) are connected.
Plant for workpiece machining

- With a first and a second component (28, 29) which are movable relative to each other from a first working position (23) in a second working position (24),

- With at least one on the first component (28) and on the second component (29) fixed line (13) for the power supply, which is guided in a power management device (11),

- wherein the energy guiding device (11)

- With a first terminal end piece (12) on the first component (28) and with a second terminal end piece (14) on the second component (29) is fixed, and

- A first strand (16) extending from the first terminal end piece (12) to a first connection end piece (17) which is connected to a connecting element (18), and

a second strand (20) extending from the second terminal end piece (14) to a second connection end piece (19) connected to the connecting element (18),

- Wherein the first connection end piece (17) of the first strand (16) and the second connection end piece (19) of the second strand (20) on the connecting element (18) are arranged side by side or one above the other and the connecting element (18) at least one line (13) between the first and second strand (16, 20) in a deflection plane (22) receives and deflects, and

- Wherein the first and the second strand (16, 20) on the connecting element (18) are each deflectable in the opposite direction.
Installation according to claim 11, characterized in that in the first working position (23) the strands (16, 20) and the connecting element (18) of the energy guiding device (11) are arranged lying in a common plane.
Plant according to claim 11 to 12, characterized in that in the second working position (24) the strands (16, 18) and the connecting element (18) of the energy guiding device (11) occupy an extension height, which is greater than the height of the first and second strand (16, 20) in the first working position (23).
Installation according to one of claims 11 to 13, characterized in that during a movement of one of the two terminal end pieces (12, 14) from the first to the second working position (23, 24), the connecting element (18) at half the travel speed to the Connection end pieces (12, 14) moves.
Installation according to one of claims 11 to 14, characterized in that during the movement of movement of the first and / or the second component (28, 29), the connecting element (18) has a position halfway up to the extension height between the two connection end pieces (12, 14). the energy management device (11) occupies.