EP3608071A1 - Method and device for cutting open and removing strapping wires from a square bale - Google Patents

Abstract

Device (1) and method for cutting and removing strapping wires (2) from a square bale (3) strapped therewith, comprising: - a positioning device (4) for positioning the square bale (3); - a cutting device (13) for cutting open the strapping wires (2) of the rectangular bale (3); and wire take-off module (17b) has a plurality of wire deformation elements (18) for forming U-shaped deformations (2c) on the strapping wires (2).

Description

• eine Positioniervorrichtung zum Positionieren des Quaderballens;
• eine Schneidvorrichtung zum Aufschneiden der Umreifungsdrähte des Quaderballens;
• eine Drahtfesthalte- und Drahtabzugsvorrichtung zum Festhalten und Abziehen der Umreifungsdrähte des Quaderballens.

The invention relates to a device for cutting and removing strapping wires from a square bale strapped therewith with a first, second, third and fourth outer side, comprising:

• a positioning device for positioning the square bale;
• a cutting device for cutting open the strapping wires of the square bale;
• a wire holding and wire pulling device for holding and pulling the strapping wires of the square bale.

The invention further relates to a method for cutting and removing strapping wires from a square bale strapped therewith.

Such a device is from the EP 2 759 483 known. In this prior art, square bales covered with binding wires are fed in a horizontal position on an endlessly rotating conveyor belt to a gripping and cutting station. The cutting and gripping station has a cutting device and a clamping device. The cutting device is aligned vertically to cut horizontal binding wires on the square bale. A cutting bar is provided as the cutting device and is equipped with a plurality of fixed knife elements arranged at a distance from one another. In addition to the fixed knife elements, there are movable knives that can move towards and away from the fixed knives. If a packaged good reaches the gripping and cutting station, the cutting bar is moved towards the square bale, so that the fixed knife elements penetrate into the square bale. If the tooth-shaped movable knives are then moved relative to the fixed knife elements, they cut through the binding wires. The clamping device is arranged on the opposite side of the packaged goods in the gripping and cutting station. This is also essentially vertical. The clamping device has a clamping bar and, in turn, like the cutting bar, has fixed fixing elements, a space for the introduction of the binding wires being provided between adjacent fixing elements. this Fixing elements are assigned to grippers that can be moved relative to the fixing elements. If the square bale is in the gripping and cutting station, the clamping bar can be moved towards the square bale, so that the fixing elements penetrate the square bale and first fix the square bale together with the fixed knife elements, the binding wires penetrating into the open space. When the clamp grippers move, the passage spaces are closed, so that the binding wires are clamped. The fixing elements of the clamping bar are designed so that they protrude from the clamping grippers. In this way, the fixing elements should be able to penetrate the packaged goods without impairing the mobility of the clamping grippers. The sections of the binding wires that enter the intermediate spaces when the fixing elements penetrate into the square bales can thus be gripped. On the opposite side, the binding materials can be cut by the cutting device, after which the clamping device further holds the binding materials overall and moves them away from the square bale.

Due to the high tension on the binding wires, even after being cut open, it can happen that the binding wires slip out of the clamping device when pulled off. Accordingly, very high clamping forces would have to be applied in order to be able to hold the binding wires in place. However, this involves a great deal of design effort or is sometimes not possible at all.

Accordingly, the object of the present invention is to alleviate or eliminate at least individual disadvantages of the prior art. In particular, the invention aims to enable the strapping wires to be gripped and pulled off more reliably.

This object is achieved by a device with the features of claim 1 and a method with the features of claim 15. Preferred embodiments are contained in the dependent claims.

According to the invention, the wire holding and wire withdrawal device a plurality of wire deformation elements to form U-shaped deformations on the strapping wires.

• Positionieren des Quaderballens;
• Aufschneiden der Umreifungsdrähte des Quaderballens;
• Festhalten und Abziehen der Umreifungsdrähte des Quaderballens, wobei das Festhalten und Abziehen der Umreifungsdrähte des Quaderballens die Ausbildung von U-förmigen Verformungen an den Umreifungsdrähten umfasst.

In the method according to the invention for cutting and removing strapping wires from a square bale strapped with them, at least the following steps are carried out:

• Positioning the square bale;
• Cutting open the strapping wires of the square bale;
• Holding and pulling the strapping wires of the square bale, wherein holding and pulling the strapping wires of the square bale comprises the formation of U-shaped deformations on the strapping wires.

Accordingly, the wire holding and wire take-off device is designed to bend the strapping wires at three locations in each case in such a way that U-shaped deformations are generated. These U-shaped deformations make it easier to pull off the strapping wires, since a positive connection between the wire retaining device and the U-shaped deformations can be produced on the strapping wires. This advantageously prevents the strapping wires from slipping when being pulled off the square bale, even at high tensions. This provides a significant improvement over the prior art, in which the strapping wires are simply clamped, i.e. are held frictionally. It is also advantageous that the deformation forces for the formation of the U-shaped deformations can be comparatively low.

For the purposes of this disclosure, all location and directional information, such as "up", "down", "horizontal", "vertical", "up", "down" etc., relate to the intended operating state of the device on a horizontal work surface.

In order to achieve the deformation of the strapping wires, wire deformation elements that are movable relative to one another are preferably provided. In a first embodiment variant, movable wire deformation elements are provided which interact with fixed wire deformation elements in such a way that the strapping wires can be bent in a U-shape between the movable and the fixed wire deformation elements. In a second embodiment variant, wire deformation elements movable towards and away from one another are provided in order to provide the U-shaped deformations on the strapping wires.

In order to deform the individual strapping wires in the desired manner, in a preferred embodiment a set of movable wire deformation elements is arranged between a first arrangement of fixed wire deformation elements and a second arrangement of fixed wire deformation elements, the set of movable wire deformation elements to form the U-shaped deformations is movable on the strapping wires relative to the first and second arrangement of fixed wire deformation elements. To bend the strapping wires, the movable wire deformation elements are between a receiving position moved away from the fixed wire deformation elements, in which the strapping wires can be received between the movable and the fixed wire deformation elements, and a bending position to be moved onto the fixed wire deformation elements, in which the strapping wires between the movable ones and the fixed wire deformation elements are bent into a U-shape, can be transferred.

A transverse drive is preferably provided for moving the movable wire deformation elements between a first position (receiving position) for receiving the strapping wires and a second position (bending position) for forming the U-shaped deformations on the strapping wires. The transverse drive is preferably set up to move the movable wire deformation elements in a direction parallel to the facing outside of the square bale, in particular substantially perpendicular to the wire deformation elements, on the facing outside of the square bale. A transverse linear drive, in particular a hydraulic linear drive, is preferably provided, which jointly moves the movable wire deformation elements from the first (receiving) position to the second (bending) position and vice versa emotional.

In order on the one hand to enable the strapping wires to be securely received and on the other hand to bring about a U-shaped deformation of the strapping wires in a simple manner, it is advantageous if the set of movable wire deformation elements by hooks on a base plate and / or the first arrangement of fixed wire deformation elements by the first Projections on a first base plate and / or the second arrangement of fixed wire deformation elements is formed by second projections on a second base plate.

According to a preferred embodiment, the positioning device has a positioning groove which is essentially V-shaped in cross-section and has a first contact surface for a first outside and with a second contact surface for a second outside of the square bale, the cutting device having a first cutting element for cutting open the strapping wires on the first The outside of the square bale and a second cutting element for cutting open the strapping wires on the second outside of the square bale, wherein the wire holding and wire pulling device has a first wire holding and wire pulling module for holding and pulling out the strapping wires on a third outer side of the square bale and a second wire holding and wire pulling module for holding and pulling the strapping wires on a fourth outside of the square bale. The V-shaped design of the positioning channel also ensures that loose material from the wired square bale does not fall out of the positioning channel.

This version offers the particular advantage that the square bale can be freed from the strapping wires in a single processing position, ie without pivoting or turning. In operation, the square bale is arranged in the V-shaped positioning channel. Depending on the design, the positioning trough can also be designed as a transport trough in which the square bale is transported, preferably in the horizontal direction. The strapping wires, ie those around the packaged goods of the Square bales looped binding wires are cut on the first and second outside of the square bale, ie on the top of the square bale. For this purpose, the cutting device has a first and a second cutting element, which is moved towards the first or second outside of the square bale in order to cut through the sections of the strapping wires which are extended there. The strapping wires are held and pulled off on the third and fourth outer sides of the square bale, ie on the upper side of the square bale. Advantageously, two sets of strapping wires, which are preferably guided perpendicular to each other around the square bale, can be cut open, held and pulled off without having to change the rotational position of the square bale. This enables a particularly simple, reliable and inexpensive removal of the strapping wires.

In order to enable the square bales to be unwired in a single processing position without turning the square bale, it is advantageous if the first contact surface and the second contact surface of the V-shaped positioning channel are each arranged at an angle of essentially 45 ° to the horizontal.

In order to enable the strapping wires to be cut open from below, it is advantageous if the V-shaped positioning channel has a first recess on the first contact surface for the passage of the first cutting element and a second recess on the second contact surface for the second cutting element of the cutting device to pass through.

With regard to a structurally simple, low-maintenance design, it is advantageous if the first cutting element is designed as a first cutting bar and the second cutting element is designed as a second cutting bar, a first cutting drive for moving the first cutting bar and a second cutting drive for moving the second cutting bar in each case between one withdrawn waiting position and an advanced cutting position is provided. To cut the strapping wires, the first and second cutting strips are preferably simultaneously against the strapping wires on the underside of the first and the second outer side of the square bale, so that the strapping wires are stretched beyond the yield point and therefore tear off. In this embodiment, the first and second cutting strips advantageously do not have to have sharp blades. This will reduce costs. Since resharpening of the first and second cutting bars is preferably not absolutely necessary, the maintenance intervals are also increased.

In a preferred embodiment, the first cutting bar and the second cutting bar are arranged to overlap (continuously) from the withdrawn waiting position to the advanced cutting position. The first and second cutting strips are preferably in parallel vertical planes, in particular directly next to one another, i.e. Back to back, arranged. The partial overlap of the first and second cutting bars ensures precise guidance of the first and second cutting bars, and collisions during feed can be reliably avoided.

The first cutting bar preferably extends essentially over the entire width of the first outside of the square bale. The second cutting bar preferably extends essentially over the entire width of the second outside of the square bale. This means that all strapping wires of the square bale can be cut open at the same time. In this way, the stability of the square bale is advantageously ensured during the entire cutting process.

The first and second cutting strips are preferably of identical design. In this embodiment, the explanations relate equally to the first and second cutting bars.

If the longitudinal axis of the first cutting bar and the longitudinal axis of the second cutting bar are each arranged at an angle of essentially 45 ° to the horizontal, the first and second cutting bars can simultaneously against the strapping wires on the first and second outside of the square bale in the V-shaped groove be pressed.

To prepare for cutting and removing the strapping wires, it is expedient if a slide element is provided for moving the square bale along the V-shaped positioning groove from an initial position to a wire removal position. In this embodiment, the positioning channel is also designed as a conveyor channel. The slide element can be pushed onto a first end face of the square bale, which extends essentially perpendicular to the transport direction along the V-shaped conveying and positioning channel. A positioning stamp, in particular with a flat sliding surface, can be provided as the slide element, for example. The slider element is preferably connected to a slider drive, which can be a chain drive, for example.

According to a preferred embodiment variant, the first wire holding and wire pulling module and / or the second wire holding and wire pulling module each have a plurality of wire deformation elements for the formation of U-shaped deformations on the strapping wires. The wire deformation elements of the first or second wire retention and wire withdrawal module are preferably of identical design. In this embodiment, the explanations relate equally to the first and second wire retention and wire take-off modules.

According to a preferred embodiment, a first feed drive for displacing the first wire holding and pull-off module is provided essentially perpendicular to the third outside of the square bale and a second feed drive for shifting the second wire holding and pull-off module essentially perpendicular to the fourth outside of the square bale. In particular, hydraulic linear drives can be provided as the first and second feed drives.

In order to remove the cut and held strapping wires, a winding device with a first winding fork for winding up the strapping wires on the third outside of the square bale in a retracted position of the first feed drive and a second winding fork for winding up are preferred the strapping wires are provided on the fourth outside of the square bale in a retracted position of the second feed drive. The first and / or second winding fork each have two winding legs, one of the winding legs being insertable between two mutually angled sections of the strapping wires, so that the strapping wires are wound on the first and second winding forks by rotating the first and second winding forks. A winding drive, in particular an electrical rotary drive, is preferably provided for rotating the first or second winding fork.

In order to prepare the further transport of the wound strapping wires, the winding device preferably has a first pivot unit for pivoting the first winding fork from a winding position to a discharge position and a second pivot unit for pivoting the second winding fork from a winding position to a discharge position. The axis of rotation of the first or second winding fork in the winding and in the ejection position extends essentially parallel to the facing outside of the square bale, the axis of rotation of the first or second winding fork in the ejection position being further away from the facing outside of the square bale than in the winding position.

In order to be able to fix the square bale when cutting open the strapping wires, a first pressing element for pressing against the third outside of the square bale and a second pressing element for pressing against the fourth outside of the square bale are provided when cutting open the strapping wires on the first and second outside of the square bale.

To fix the square bale in the cutting position, a first linear drive for displacing the first pressing element between a position spaced from the square bale and a position pressed against the third outside of the square bale and a second linear drive for displacing the second pressing element between a position spaced from the square bale and one are preferred Position pressed against the fourth outside of the square bale. In the clamping position the square bale is fixed on the top side by the first and the second pressing element and on the underside by the first and the second contact surface of the V-shaped conveyor trough.

According to a preferred embodiment, a first slide unit with a first upper slide and a first lower slide and a second slide unit with a second upper slide and a second lower slide are provided, the first wire holding and wire withdrawal module on one of the first upper slide and first lower slide and the first pressing element on the other of the first upper slide and the first lower slide is arranged, the second wire holding and wire take-off module being arranged on one of the second upper slide and second lower slide and the second pressing element on the other of the second upper slide and second lower slide.

• Fig. 1A zeigt eine Ansicht einer erfindungsgemäßen Vorrichtung zum Aufschneiden und Entfernen von Umreifungsdrähten an einem Quaderballen, insbesondere aus Kunststoffabfällen.
• Fig. 1B zeigt eine schaubildliche Ansicht eines Quaderballens mit einer Kreuzverdrahtung.
• Fig. 2 zeigt eine Ansicht einer Positionier- und Förderrinne der Vorrichtung gemäß Fig. 1.
• Fig. 3 zeigt eine Ansicht der Positionier- und Förderrinne in Verbindung mit einer Schneidvorrichtung der Vorrichtung gemäß Fig. 1.
• Fig. 4 und Fig. 5 zeigen jeweils eine erste Schlitteneinheit der Vorrichtung gemäß Fig. 1, wobei ein erstes Drahtfesthalte- und Drahtabzugsmodul an einem ersten Oberschlitten und ein erstes Andrückelement an einem ersten Unterschlitten angeordnet sind.
• Fig. 6 bis 11 zeigen verschiedene Ansichten des ersten Drahtfesthalte- und Drahtabzugsmoduls.
• Fig. 12 zeigt eine Seitenansicht der ersten Schlitteneinheit gemäß Fig. 4 und Fig. 5.
• Fig. 13 zeigt die erste Schlitteneinheit beim Abziehen der Umreifungsdrähte.
• Fig. 14 zeigt eine Wickelvorrichtung der Vorrichtung gemäß Fig. 1.

The invention is further explained below using an exemplary embodiment shown in the figures.

• Fig. 1A shows a view of an inventive device for cutting and removing strapping wires on a square bale, in particular from plastic waste.
• Figure 1B shows a perspective view of a square bale with cross wiring.
• Fig. 2 shows a view of a positioning and conveyor trough of the device according to Fig. 1 ,
• Fig. 3 shows a view of the positioning and conveyor trough in connection with a cutting device of the device according to Fig. 1 ,
• Fig. 4 and Fig. 5 each show a first carriage unit according to the device Fig. 1 , wherein a first wire holding and wire take-off module are arranged on a first upper slide and a first pressing element on a first lower slide.
• 6 to 11 show different views of the first wire retention and wire take-off module.
• Fig. 12 shows a side view of the first carriage unit according to Fig. 4 and Fig. 5 ,
• Fig. 13 shows the first carriage unit when removing the strapping wires.
• Fig. 14 shows a winding device of the device according to Fig. 1 ,

Fig. 1A shows in cross section a device 1 for cutting and removing binding wires or strapping wires 2, with which a square bale 3 is held together from piece material. The device 1 enables the first 2a and second strapping wires 2b to be removed from the square bale 3 without having to turn the square bale 3.

How from Figure 1B As can be seen, the square bale 3 has a first 3a, second 3b, third 3c and fourth outer side 3d as well as a first end side 3e and a second end side 3f. In the embodiment shown, the outer sides 3a, 3b, 3c, 3d and end faces 3e, 3f of the square bale 3 are provided with a so-called cross wiring. Accordingly, a plurality of first strapping wires 2a extend parallel and at a distance from one another from the first outer side 3a over the first end side 3e, the fourth outer side 3d and the second end side 3f to the first outer side 3a. A plurality of second strapping wires 2b extend parallel and at a distance from one another from the second outer side 3b via the first end side 3e, the third outer side 3c and the second end side 3f to the second outer side 3b. Thus, the first strapping wires 2a and the second strapping wires 2b cross only on the first end face 3e and on the second end face 3f. Only the first strapping wires 2a are provided on the first 3a and fourth outside 3d, and only the second strapping wires 2b are provided on the second 3b and third outside 3c. Thus, on each outer side 3a to 3d there are only first strapping wires 2a or second strapping wires arranged parallel to one another 2b provided.

How especially out Fig. 2 As can be seen, the device 1 initially has a positioning and conveying device 4 for conveying the square bales 3 in the direction perpendicular to the first 3e or second end face 3f of the square bale and positioning the square bales 3 in a position for cutting and removing the strapping wires 2 (cf. Arrow 5 in Fig. 2 ). The transport device 4 has a positioning and conveying trough 6, which the cross bale 3 via a conventional bale feed 7 (cf. Fig. 1 ), for example a conveyor belt. The square bale 3 is conveyed along the positioning and conveying channel 6 in the transport direction 5 between an initial position adjacent to the bale feed 7 and a dewiring position for cutting and removing the strapping wires 2. In the embodiment shown, the positioning and conveying trough 6 is essentially V-shaped in cross-section (viewed perpendicular to the direction of transport 5) with a first contact surface 6a for the first outside 3a and with a second contact surface 6b for the second outside 3b of the square bale 3 , The first contact surface 6a and the second contact surface 6b of the V-shaped positioning and conveying trough 6 are each arranged at an angle of essentially 45 ° to the horizontal, ie the first 6a and second contact surface 6b are at an angle of essentially 90 ° to one another arranged. To move the square bale 3 along the V-shaped postioning and conveying channel 6 from the initial position into the unwiring position, a slide element 8 is provided which is guided against the first end face 3e of the square bale 3. A positioning punch 8a is provided as slide element 8, which is connected to a slide drive 9, here a chain drive.

The square bale 3a is conveyed along the conveying and positioning channel 6 by the conveying and positioning device 4 and in the in Fig. 1 Obvious Wiringposition positioned to then cut the strapping wires 2 and can be removed from the square bale 3.

The device 1 has a fixing unit 10 for fixing the Square bale 3 in the unwiring position. The fixing unit 10 has a first pressing element 11a for pressing against the third outside 3c of the square bale 3 (cf. in detail Fig. 4 . 5 ) and a second pressing element 11b for pressing against the fourth outer side 3d of the square bale 3. To move the first pressing element 11a between a position spaced apart from the third outer side 3c of the square bale 3 and a position pressed against the third outer side 3c of the square bale 3, a first linear drive is used to move the second pressing element 11b between one of the fourth outer sides 3d of the square bale 3 spaced position and a position pressed against the fourth outer side 3d of the square bale 3, a second linear drive 12b is provided. By activating the first and second linear drives 12b, the square bale 3 is fixed from above by the first pressing element 11a and by the second pressing element 11b against the first 6a and second contact surface 6b of the positioning channel 6. In the embodiment shown, the first 11a and second pressing element 11b each have a pressing bar with a flat contact surface extending parallel to the facing outside 3c or 3d of the square bale 3.

How especially out Fig. 3 can be seen, the device 1 also has a cutting device 13, which is activated in the positioned and fixed state of the square bale 3. The cutting device 13 has a first cutting element 13a for cutting open the strapping wires 2 on the first outer side 3a of the square bale 3 and a second cutting element 13b for cutting open the strapping wires 2 on the second outer side 3b of the square bale 3. In the embodiment shown, the V-shaped positioning and conveying trough 6 has a first recess 14a on the first support surface 6a for the passage of the first cutting element 13a and a second recess 14b on the second support surface 6b for the passage of the second cutting element 13b of the cutting device 13. The first cutting element 13a is designed as a first cutting bar, the second cutting element 13b as a second cutting bar. The first cutting bar is connected to a first cutting drive 15a, the second cutting bar to a second cutting drive 15b. In the shown The first 15a and second cutting drive 15b each have at least one linear drive, in this case two hydraulic drives each. Furthermore, a first steering lever 16a is provided for the first cutting bar and a second steering lever 16b for the second cutting bar. By activating the first 15a and second cutting drives 15b, the first and second cutting strips are moved together from a withdrawn waiting position (below the first 6a and second contact surface 6b) Fig. 3 with solid lines) into a cutting position passing through the first recess 14a or the second recess 14b of the positioning and conveying trough 6 (in Fig. 3 shown with dashed lines). The first cutting bar is pressed against the strapping wires on the first outside 3a, the second cutting bar against the strapping wires on the second outside 3b. Since the cross bale 3 cannot deflect upwards due to the fixing unit 10, the strapping wires 2 are stretched by the first and second cutting strips until the strapping wires 2 tear. After activation of the cutting device 13, the strapping wires 2 are in the cut state, but are still arranged adjacent to the square bale 3. In the embodiment shown, the first and second cutting strips are arranged back to back, that is to say parallel and adjacent to one another. The first and second cutting bars are arranged to overlap from the withdrawn waiting position to the advanced cutting position in order to avoid a collision between the first and second cutting bars. The longitudinal axes of the first and second cutting bars are each arranged at an angle of essentially 45 ° to the horizontal, so that the first cutting bar perpendicular to the strapping wires 2 on the first outer side 3a and the second cutting bar perpendicular to the strapping wires 2 on the second outer side 3b is moved.

The device 1 also has a wire holding and wire pulling device 17 for holding and pulling the strapping wires 2 of the square bale 3, one (in detail from Fig. 4 . 5 such as Fig. 12 . 13 visible) first wire holding and wire pulling module 17a for holding and pulling out the strapping wires 2 on the third outer side 3c of the square bale 3 and a second wire holding and wire pulling module 17b for holding and pulling out the strapping wires 2 are provided on the fourth outer side 3d of the square bale 3.

How especially out 5 to 11 As can be seen, the first 17a and the second wire holding and wire withdrawal module 17b each have a plurality of wire deformation elements 18 for the formation of U-shaped deformations (cf. Fig. 9 ) on the strapping wires 2. In the embodiment shown, a set of movable wire deformation elements 18a is arranged between a first arrangement of fixed wire deformation elements 18b and a second arrangement of fixed wire deformation elements 18c. The set of movable wire deformers 18a can be moved toward and away from the first 18b and second arrays of fixed wire deformers 18c. For this purpose, a transverse drive 19, in particular another hydraulic linear drive, is provided, with which the movable wire deformation elements 18a between a first position for receiving the strapping wires 2 in spaces 18d between the movable and fixed wire deformation elements and a second position for forming the U-shaped ones Deformations on the strapping wires 2 can be moved.

The set of movable wire deformation elements 18a is formed by hooks 20 which protrude from a base plate 21 in the direction of the square bale 3. The hooks 20 are preferably arranged at regular intervals along the base plate 21. The first arrangement of fixed wire deformation elements 18b is formed by first projections 22a, which protrude from a first base plate 23a in the direction of the square bale. The second arrangement of fixed wire deformation elements 18c is identical to the first arrangement of fixed wire deformation elements by second projections 22b which protrude from a second base plate 23b in the direction of the square bale 3. The first projections 22a are preferably provided on the first base plate 23a at regular intervals, and the second projections 22b are provided on the second base plate 23b at regular intervals. In a preferred embodiment, the hooks are 20, first 22a and second projections 22b essentially in the direction of the square bale 3.

The device 1 also has a first feed drive 24a, in particular a hydraulic drive, with which the first wire holding and wire take-off module 17a can be displaced essentially perpendicular to the third outer side 3c of the square bale 3. In addition, a second feed drive 24b, in particular an additional hydraulic drive, is provided, with which the second wire holding and wire take-off module 17b can be displaced essentially perpendicular to the fourth outer side 3d of the square bale 3. When the first 17a or second wire holding and wire take-off module 17b is moved toward the square bale 3, the strapping wires 2 are picked up and then provided with the U-shaped deformations 2c by activating the transverse drive 19. After the formation of the U-shaped deformations 2c on the strapping wires 2, the first 17a and second wire holding and pulling-off module 17b can be moved away from the square bale 3, so as to pull the strapping wires 2 from the square bale 3.

In the embodiment shown, the fixing unit 10 and the wire retention and removal device 17 are replaced by a (in detail in Fig. 4 . 5 visible) first carriage unit 25 and a second carriage unit, wherein the first carriage unit 25 of the third outside 3c and the second carriage unit of the fourth outside 3d of the square bale 3 is assigned. The first carriage unit 25 has a first upper carriage 25a and a first lower carriage 25b. The second slide unit has a second upper slide and a second lower slide. The first wire holding and wire withdrawal module 17a is arranged on the first upper slide 25a and the first pressing element 11a on the first lower slide 25b. The second wire holding and wire withdrawal module 17b is arranged on the second upper slide and the second pressing element 11b on the second lower slide. In addition, a first wire deflection element 27a (cf. Fig. 13 ) and a second wire deflection element 27b are provided, with which the strapping wires 2 are pulled off from the square bale 3 by means of the wire retention and wire withdrawal modules 17a, 17b can be deflected.

How from Fig. 13 and Fig. 14 As can be seen, the device 1 also has a winding device 28 for winding up the strapping wires 2 which have been cut open and removed from the square bale 3. The winding device 28 has a first winding fork 29 for winding the strapping wires on the third outer side 3c of the square bale 3 in a retracted position of the first feed drive 24a. Furthermore, the winding device 28 has a second winding fork 30 for winding the strapping wires 2 on the fourth outer side 3d of the square bale 3 in a retracted position of the second feed drive 24b. The first 29 and second winding fork 30 each have two legs 31, one of the legs 31 being inserted between two sections 32 of the strapping wires 2 which have been pulled off the square bale 3 and deflected by the wire deflection elements 27a, 27b. The strapping wires 2 are wound up by rotating the first 29 and second winding fork 30. The winding device 28 has a first swivel unit 33a (cf. Fig. 14 ) for pivoting the first winding fork 29 from a winding position (in Fig. 14 with solid lines) in a release position (in Fig. 14 shown with dashed lines). Correspondingly, the winding device 28 has a second pivoting unit for pivoting the second winding fork 30 from a winding position into a discharge position.

In the embodiment shown, the strapping wires 2 are removed from the square bale 3 at least as follows:
First, the square bale 3 is fed into the conveying and positioning channel 6 via the bale feed 7. By activating the slide drive 8, the square bale 3 is pushed in the transport direction 5 into the unwiring position. Then the first 11a and second pressing element 11b are pressed against the square bale 3, so that the square bale is clamped. The strapping wires 2 are then cut open using the first 13a and second cutting element 13b. For this purpose, the first 15a and second cutting drive 15 are activated that the first 13a and second cutting element 13b pass through the first 14a and second recess 14b and thus cut the strapping wires 2 on the first 3a and second outside 3b of the square bale 3. The strapping wires 2 are then captured on the respectively opposite third 3c and fourth outer side 3d with the aid of the first 17a and second wire holding and wire withdrawal module 17b. Here, U-shaped deformations are generated on the strapping wires 2, on which the strapping wires 2 are held. The strapping wires are then pulled away from the square bale 3 and finally wound up.

Claims (15)

Device (1) for cutting and removing strapping wires (2) from a square bale (3) strapped therewith with a first (3a), second (3b), third (3c) and fourth outer side (3d): - A positioning device (4) for positioning the square bale (3); - A cutting device (13) for cutting the strapping wires (2) of the square bale (3); - A wire holding and pulling device (17) for holding and pulling the strapping wires (2) of the square bale (3); characterized in that the wire holding and wire pulling device (17) has a plurality of wire deformation elements (18) for forming U-shaped deformations (2c) on the strapping wires (2). Device according to claim 1, characterized in that a set of movable wire deformation elements (18a) is arranged between a first arrangement of fixed wire deformation elements (18b) and a second arrangement of fixed wire deformation elements (18c), the set of movable wire deformation elements (18a) for Formation of the U-shaped deformations (2c) on the strapping wires (2) relative to the first (18b) and second arrangement of fixed wire deformation elements (18c) is movable. Apparatus according to claim 2, characterized in that a transverse drive (19) for moving the movable wire deformation elements (18a) between a first position for receiving the strapping wires (2) and a second position for forming the U-shaped deformations (2c) on the strapping wires (2) is provided. Apparatus according to claim 2 or 3, characterized in that the set of movable wire deformation elements (18a) by hooks (20) on a base plate (21) and / or that the first arrangement of fixed wire deformation elements (18b) by first projections (22a) on a first base plate (23a) and / or that the second arrangement of fixed wire deformation elements (18c) is formed by second projections (22b) on a second base plate (23b). Device according to one of Claims 1 to 4, characterized in that the positioning device (4) has a positioning channel (6) which is substantially V-shaped in cross section and has a first contact surface (6a) for a first outside (3a) and a second contact surface ( 6b) for a second outer side (3b) of the square bale (3), the cutting device (13) having a first cutting element (13a) for cutting open the strapping wires (2) on the first outer side (3a) of the square bale (3) and a second one Cutting element (13b) for cutting open the strapping wires (2) on the second outer side (3b) of the square bale (3), the wire holding and wire pulling device (17) having a first wire holding and wire pulling module (17a) for holding and pulling out the strapping wires ( 2) on a third outer side (3c) of the square bale (3) and a second wire holding and wire pulling module (17b) for holding and pulling out the strapping wires (2) on e has the fourth outer side (3d) of the square bale (3). Apparatus according to claim 5, characterized in that the V-shaped positioning channel (6) on the first contact surface (6a) has a first recess (14a) for the passage of the first cutting element (13a) and on the second contact surface (6b) a second recess ( 14b) for the passage of the second cutting element (13b) of the cutting device (13). Apparatus according to claim 5 or 6, characterized in that the first cutting element (13a) is designed as a first cutting bar and the second cutting element (13b) is designed as a second cutting bar, a first cutting drive (15a) for moving the first cutting bar and a second cutting drive ( 15b) is provided for moving the second cutting bar in each case between a withdrawn waiting position and an advanced cutting position. Apparatus according to claim 7, characterized in that the first cutting bar and the second cutting bar are arranged to overlap from the withdrawn waiting position to the advanced cutting position. Device according to one of claims 5 to 8, characterized in that a slide element (8) for moving the square bale (3) along the V-shaped positioning channel (6) is provided from an initial position to a wire removal position. Device according to one of claims 5 to 9, characterized in that the first wire retention and wire withdrawal module (17a) and / or the second wire retention and wire withdrawal module (17b) each have a plurality of wire deformation elements (18) to form U-shaped deformations ( 2c) on the strapping wires (2). Device according to one of claims 5 to 10, characterized in that a first feed drive (24a) for displacing the first wire holding and wire take-off module (17a) substantially perpendicular to the third outer side (3c) of the square bale (3) and a second feed drive (24b ) are provided for displacing the second wire holding and wire withdrawal module (17b) substantially perpendicular to the fourth outside (3d) of the square bale (3). Device according to one of claims 5 to 11, characterized in that a first pressing element (11a) for pressing against the third outside (3c) of the square bale (3) and a second pressing element (11b) for pressing against the fourth outside (3d) of the Square bales (3) are provided on the first (3a) and second outside (3b) of the square bale (3) when the strapping wires (2) are cut open. Device according to claim 12, characterized in that a first linear drive for displacing the first pressing element (11a) between a position spaced apart from the square bale (3) and against the third outer side (3c) of the square bale (3) pressed position and a second linear drive for displacing the second pressing element (11b) between a position spaced from the square bale (3) and a position pressed against the fourth outside (3d) of the square bale (3). Device according to claim 12 or 13, characterized in that a first slide unit (25) with a first upper slide (25a) and a first lower slide (25b) and a second slide unit with a second upper slide and a second lower slide are provided, the first wire holding - And wire take-off module (17a) on one of the first upper slide (25a) and first lower slide (25b) and the first pressing element (11a) on the other of the first upper slide (25a) and first lower slide (25b) are arranged, the second wire holding and Wire take-off module (17b) on one of the second upper slide and second lower slide and the second pressing element (11b) on the other of the second upper slide and second lower slide are arranged. Method for cutting and removing strapping wires (2) from a square bale (3) strapped therewith, comprising: - Positioning the square bale (3); - Cutting open the strapping wires (2) of the square bale (3); - Holding and pulling the strapping wires (2) of the square bale (3); characterized in that the holding and pulling off of the strapping wires (2) of the square bale (3) comprises the formation of U-shaped deformations (2c) on the strapping wires (2).

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