HANDLING SYSTEM FOR HANDLING STACKABLE FLAT ELEMENTS

Abstract

A handling system (100) for handling stackable flat elements, in particular carton elements. The system (100) includes a supporting table (102) on which at least an edge portion (303) of a stack (101) of flat elements is supportable, a clamping device (103) configured for clamping a first part (113) of the edge portion of the stack (101) to the supporting table (102), and a lifting device (104) configured for lifting a second part (114) of the stack (101) from the supporting table (102). The lifting device (104) and the clamping device (103) are arranged to the supporting table (102) such that the stack (101) is bendable by clamping the first part (113) of the stack (101) onto the supporting table (102) by the clamping device (103) and lifting the second part (114) of the stack (101) from the supporting table (102) by the lifting device (104) at the same time such that the stack (101) is bent around a bending axis (109), wherein the bending axis (109) extends within a plane parallel to a supporting plane (112) of the supporting surface (111).

Claims

1. A handling system for handling stackable flat elements, the handling system comprising: a supporting table having a supporting surface on which at least an edge portion of a stack of the flat elements is supportable; a clamping device located and configured for clamping a first part of the stack to the supporting table; and a lifting device configured for lifting a second part of the stack from the supporting table; the lifting device and the clamping device are arranged at the supporting table such that the stack is bendable by clamping of the first part of the stack onto the supporting table by the clamping device and by lifting the second part of the stack from the supporting table by the lifting device at the same time, such that the stack is bent around a bending axis; and the bending axis extends within a plane parallel to a supporting plane of the supporting surface.

2. A handling system according to claim 1, wherein the supporting table is movable along a moving direction having a horizontal component, between a first position and a second position; and the clamping device is configured for clamping the stack to the supporting table during a movement of the supporting table between the first position and the second position.

3. A handling system according to claim 1, wherein the lifting device comprises at least one lifting element being movable along a lifting direction having at least one vertical component for lifting a part of the stack.

4. A handling system according to claim 3, wherein the lifting element is mounted to the supporting table such that the lifting element is extendible from the supporting surface of the supporting table on which the stack is arrangeable.

5. A handling system according to claim 4, wherein the lifting element is configured to be extendible in a telescopic manner.

6. A handling system according to claim 4, wherein the lifting element is configured to be extendible by being pivoted around a pivoting axis.

7. A handling system according to claim 3, wherein the lifting device comprises at least one further lifting element being movable along the lifting direction, the lifting direction having at least one vertical component; and the further lifting element is spaced apart from the lifting element.

8. A handling system according to claim 7, wherein the clamping device is arranged between the lifting element and the further lifting element.

9. A handling system according to claim 1, wherein the clamping device comprises at least one clamping element, which is movable along a clamping direction having at least one vertical component.

10. A handling system according to claim 9, wherein the clamping element forms a stamp element configured for clamping the stack to the supporting table.

11. A handling system according to claim 9, wherein the clamping device comprises at least one further clamping element being movable along the clamping direction in at least one vertical component; and the further clamping element is spaced apart from the clamping element.

12. A handling system according to claim 11, wherein the lifting device is arranged between the clamping element and the further clamping element.

13. A handling system according to claim 1, further comprising: a transport device comprising a supporting platform onto which at least a further edge portion of the stack is supportable; the transport device is configured for clamping the further edge portion of the stack to the supporting platform; and the transport device is movable for transporting the stack to the supporting table, such that the edge portion of the stack is arrangeable on the supporting table.

14. A handling system according to claim 1, further comprising: a receiving section at which the stack is receivable; the receiving section is arranged below the supporting table and the transport device; the transport device is further movable for transporting the stack to the supporting table such that the further edge portion of the stack is arrangeable above the receiving section; and the transport device is configured for releasing the further edge portion of the stack and for moving away from the receiving section such that the further edge portion falls down to the receiving section while the first part of the stack is clamped to the supporting table by the clamping device and the second part of the stack is lifted by the lifting device.

15. A method for handling stackable flat elements, the method comprising: arranging at least an edge portion of a stack of the flat elements on a supporting surface of a supporting table; bending the stack by clamping a first part of the stack on the supporting table by a clamping device and lifting a second part of the stack from the supporting table by a lifting device at the same time, such that the stack is bent around a bending axis; and the bend axis extends within a plane parallel to a supporting plane of the supporting surface.

16. A handling system for handling a stack of flat elements, the stack comprising upper and lower faces and a proximal side face mutually opposite a distal side face; the system comprising: a support surface arranged and configured to support the lower face of the stack in a region adjacent the proximal side face; a clamp arranged to clamp the upper surface of the stack in a region adjacent the proximal side face and against the support surface; and the system being further arranged to bend the stack for causing the stack to become stiffer, thereby at least partially counteracting deflection under gravity of the stack in the area adjacent the distal side face relative to the area adjacent the proximal side face.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The aspects defined above and further aspects of the present invention are apparent from the examples of embodiment to be described hereinafter and are explained with reference to the examples of embodiment. The invention will be described in more detail hereinafter with reference to examples of embodiment but to which the invention is not limited.

[0041] FIG. 1 shows an exemplary embodiment of the handling system, wherein a stack of flat elements is bent by a clamping device and a lifting device.

[0042] FIG. 2 shows the handling system of FIG. 1, wherein the stack of flat elements is not bent by the clamping device and the lifting device.

[0043] FIG. 3 shows an exemplary embodiment of the handling system additionally comprising a transport device and a receiving section.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0044] The illustrations in the drawings are schematic. It is noted that in different Figures, similar or identical elements are provided with the same reference signs.

[0045] FIG. 1 and FIG. 2 show a handling system 100 for handling stackable flat elements, in particular carton elements, according to an exemplary embodiment of the present invention. The handling system 100 comprises a supporting table 102 onto which at least an edge portion 303 of a stack 101 of flat elements is supportable, a clamping device 103 configured for clamping a first part 113 of the edge portion of the stack 101 to the supporting table 102, and a lifting device 104 configured for lifting a second part 114 of the stack 101 from the supporting table 102. The lifting device 104 and the clamping device 103 are arranged to the supporting table 102 such that the stack 101 is bendable by clamping the first part 113 of the stack 101 onto the supporting table 102 by the clamping device 103 and lifting the second part 114 of the stack 101 from the supporting table 102 by the lifting device 104 at the same time that the stack 101 is bent around a bending axis 109, wherein the bending axis 109 extends within a plane parallel to a supporting plane 112 of the supporting surface 111.

[0046] The flat elements forming the stack 101 may be non-folded cartons. The first part 113 of the stack 101 defines a section of the stack 101 which contacts the clamping device 103 when the device 103 clamps the stack 101 to the supporting table 102. Specifically, the first part 113 is defined by a contact region of the clamping device 103 clamping on region a first top sheet (flat element) of the stack 101. The second part 114 defines a section of the stack 101 which contacts the lifting device 104 during lifting of the stack 101 from the supporting table 102 by the lifting device 104. Specifically, the second part 114 is defined by a contact region of the lifting device 104 with a second lower/bottom sheet (flat element) of the stack 101. In a preferred embodiment, the first part 113 and the second part 114 are defined within the edge portion 303 of the stack 101 (see FIG. 3). The edge portion 303 of the stack is initially bent by the clamping device 103 and the lifting device 104. By bending of the edge portion 303, additionally the center portion 302 and the opposed further edge portion 304 are bent around the bending axis 109 as well, also if the clamping device 103 and the lifting device 104 act on the stack 101 only at the edge portion 303.

[0047] The supporting table 102 supports at least the edge portion 303 of the stack 101. The supporting table 102 comprises in particular the supporting surface 111 onto which the stack 101 is partially arranged. If the clamping device 103 does not clamp the stack 101 to the supporting table 102 (see FIG. 2), the stack 101 may slide along the supporting surface 111 until the stack 101 is located at the defined position onto the supporting table 102. The supporting surface 111 may be formed within a supporting plane 112, e.g. a horizontal plane. Alternatively, the supporting surface 111 and hence the supporting plane 112 may be inclined with respect to the horizontal plane. This means, that the normal of the supporting surface 111 and hence the supporting plane 112 may have an angle to the normal of the horizontal plane of for example approximately 1 to approximately 45.

[0048] The clamping device 103 may comprises a clamping element, such as one or more stamps, as shown in the FIG. 1 and FIG. 2, which is configured to clamp the first part 113 of the stack 101 against the supporting table 102. The clamping device 103 is movable along a vertical direction and may move along the vertical clamping direction 108 from a position spaced apart from the supporting table 102 to a position closer to the supporting table 102 for thereby clamping the first part 113 of the stack 101 between the clamping device 103 and the supporting table 102 as shown in FIG. 1.

[0049] The lifting device 104 comprises two lifting elements 105, 106, which are mounted to the supporting table 102 and are integrated with the supporting table 102 such that the lifting elements 105, 106 form a flat and homogeneous surface with the supporting surface (see FIG. 1). The elements 105, 106 rise from the supporting surface 111 along the lifting direction 107 to lift the second part 114 of the stack 101. The lifting direction 107 defines a direction having a vertical component, wherein the lifting elements 105, 106 extends along the lifting direction 107 when rising from the supporting surface 111.

[0050] Before bending at the stack 101 of flat elements, the stack 101 rests on the supporting surface 111 of the supporting table 102 (see FIG. 2). The supporting surface 111 defines for example the supporting plane 112. Hence, if the stack 101 of flat elements is arranged on the supporting surface 111, each of the flat elements is arranged within a plane which is spaced apart from the supporting plane 112 and parallel to the supporting plane 112. Hence, if the stack 101 is unbent and has only a general two dimensional extension within the respective plane (see FIG. 2), the stack 101 and the flat elements, respectively, are easy to be deformed around a deforming axis 110 which extends within the respective plane.

[0051] As can be seen in FIG. 1, the stack 101 of the flat elements is bent such that the stack 101 and each flat element, respectively, are bent by the lifting device 104 and the clamping device 103 around the bending axis 109. As seen in FIG. 1, the bent stack 101 forms a U-shape. The bending by the lifting device 104 and the clamping device 103 describes bending which causes an elastic and non-plastic deformation of the stack 101. In other words, the bending by the lifting device 104 and the clamping device 103 does not include a folding or cracking of the stack 101 and the flat elements, respectively.

[0052] Deforming of the stack 101 around a deforming axis 110 extending within the plane 112 and differing (e.g. being perpendicular) from the above described bending axis 109 is avoided because the stack 101 is stiffer against the deformation around the deformation axis due to the U-shaped cross-section. Hence, handling the stack 101 in a bent and stiffer state reduces the risk of damaging the flat elements by reducing the risk of unintentional folding or cracking around a deformation axis.

[0053] In the exemplary embodiment, the lifting device 104 comprises in the exemplary embodiment a lifting element 105 and at least one further lifting element 106, both being movable along the lifting direction 107 which has at least one vertical component, wherein the further lifting element 106 is spaced apart from the lifting element 105.

[0054] The clamping device 103 is arranged between the lifting element 105 and the further lifting element 106. Hence, the clamping device 103 may for example clamp a central part (first section 113) of the stack 101 to the supporting table 102, wherein an edge part (second part 114) of the stack 101 and an further edge part (further second part 114) of the stack 101, which is arranged at an opposite side of the stack 101 with respect to the edge part, is lifted by the respective lifting elements 105, 106. The stack 101 is thereby bent, wherein the bending axis 109 is generated in the region of the central part 113, so that the stack 101 forms a generally U-shape.

[0055] The lifting elements 105, 106 are configured to be extendible by being pivoted around a pivot axis (see arrows in FIG. 1). For example, each lifting element 105, 106 is formed as a lever which is mounted pivotably to the supporting table 102. In order to lift the second part 114 of the stack 101, the pivotable lever may be pivoted around a pivoting axis such that a part of the lever spaced apart from the pivoting axis lifts along the lifting direction 109. FIG. 1 shows a first end of the pivotable lever fixed pivotably to the supporting table 102, and an opposed second free end of the pivotable lever defines a free end which lifts along the lifting direction and thereby contacts the second part 114 of the stack 101. The first end of the lever is located at a center section of the supporting table 102 and the opposite second free end of the lever is located more toward an edge section of the supporting table 102 (which edge section surrounds the center section of the supporting table 102). Hence, during pivoting of the lever around the pivot axis, the free second end of the lever lifts over a larger distance from the supporting table 102 than other sections of the lever forming an inclined lifting surface. The inclined lifting surface makes possible a smooth and gentle bending of the first part 113 of the stack 101.

[0056] FIG. 3 shows an exemplary embodiment of the handling system further comprising an additional a transport device 308 and a receiving section 306.

[0057] The supporting table 102 is movable along a moving direction 301 having a horizontal component, between a first position and a second position, wherein the clamping device 103 is configured for clamping the stack 101 to the supporting table 102 during movement of the supporting table 102 between the first position and the second position. The supporting table 102 comprises roller/wheel elements 305 for moving the table along the moving direction 301. For example, the supporting table 102 may be arranged on a guiding rail, for example. In the illustrated embodiment, the clamping device 103 and the lifting device 104 are mounted to the supporting table 102 such that the clamping device 103 and the lifting device 104 move together with the supporting table 102 along the moving direction 301.

[0058] For example at the first position (shown in FIG. 3), the stack 101 is arranged on the supporting surface 111 of the supporting table. Next, the clamping device 103 and the lifting device 104 fix the stack 101. In this fixed and bent state, the supporting table 102 moves along the moving direction 301 to a desired second position (e.g. moves to the right in FIG. 3), where the clamping device 103 and the lifting device 104 release the stack 101 such that the stack 101 is available for further processing or transportation away from the supporting table 102. During the transportation between the first position and the second position, the stack 101 is in a bent state and is more robust and stiffer against an undesired deformation around the deformation axis.

[0059] The handling system 100 further comprises the transport device 308, comprising a supporting platform 309 onto which at least a further edge portion 304 of the stack 101 is supportable, wherein the transport device 308 is configured for clamping the further edge portion 304 of the stack 101 to the supporting platform 309 by a hold-down element. The transport device 308 is movable along a transport direction 310 for transporting the stack 101 to the supporting table 102 such that the edge portion 303 of the stack 101 is arrangeable on the supporting table 102.

[0060] The edge portion 303 of the stack 101 denotes a portion of the stack 101 between an edge portion and a center portion 302 of the stack 101 within a plane along which the length and the width of the stack 101 are defined. The edge portion 303 runs along an edge of the stack 101 and may have an area within the plane of to 1/10 times or less than the area of a center portion of the stack 101. The center portion 302 of a stack 101 is surrounded by edge portions 303, 304 running along respective edges of the stack 101, wherein the edge portions 303, 304 define areas between the center portion 302 and the respective edges of a stack 101. Specifically, the edge portion 303 and the further edge portion 304 which are described herein denotes opposing edge portions 303, 304 of the stack 101.

[0061] In a preferred embodiment, the first part 113 and the second part 114 are defined within the edge portion 303 of the stack 101. The edge portion 303 of the stack 101 is initially bent by the clamping device 103 and the lifting device 104. By bending the edge portion 303, additionally the center portion 302 and the opposite further edge portion 304 are bent around the bending axis 109 as well, also if the clamping device 103 and the lifting device 104 acts onto the stack 101 only at the edge portion 303.

[0062] The further edge portion 304 of the stack 101 is clamped by the hold down element 311 to the supporting platform 309. The rest of the stack 101 which is not clamped by the hold down element 311 is arranged for example on a carrier (not shown), for example. By moving the transport device 308 along a desired direction, for example perpendicular to the moving direction 301 of the supporting table 102, the edge portion 303 of the stack 101 slips away from the carrier and can be slid onto the supporting surface 111 of the supporting table 102.

[0063] A receiving section 306 is arranged below the supporting table 102 and the transport device 308. The receiving section 306 may define for example a section from which the stack 101 and the single flat elements of the stack 101 are further processed, for example by a processing device 312. The processing device 312 may be a device for processing, laminating, coating or printing of the flat elements.

[0064] The transport device 308 along a transport direction 310 is further movable for transporting the stack 101 to the supporting table such that the further edge portion 304 of the stack 101 may be arranged above the receiving section 306. The transport device 308 is configured for releasing the further edge portion 304 of the stack 101 and for moving away from the receiving section 306 such that the further edge 304 falls down to the receiving section 306 while the first part 113 of the stack 101 is clamped to the supporting table 102 by the clamping device 103 and the second part 114 of the stack 101 is lifted by the lifting device 104.

[0065] For example, after the transport device 308 pushes at least the edge portion 303 of the stack 101 onto the supporting surface 111, the transport device 308 releases the further edge portion 304. The further edge portion 304 is thereby located above the receiving section 306. After the transport device 308 moves away, the further edge portion 304 falls onto the receiving section 306. Alternatively, the supporting table 102, to which the edge portion 303 of the stack 101 is fixed by the clamping device 103 and the lifting device 104, may move away from the transport device 308 so that the further edge portion 304 slips from the support platform 309 of the transporting device 308.

[0066] Because the stack 101 is bent during its fall onto the receiving section 306, the stack 101 is still and robust and stiff, such that a undesired deformation of the stack 101 is prevented. Additionally, after the further edge portion 303 is located onto the receiving section 306, the supporting table 102 may move along a moving direction 301 for example from the second position to the first position such that the location of the further edge portion 304 laying on the receiving section 306 may be adjusted by moving the supporting table 102. During the movement of the supporting table 102, the stack 101 is still bent by the clamping device 103 and the lifting device 104. As a result, the stack 101 is stiff and robust enough such that also undesired deformation during the movement of the supporting table 102 is prevented.

[0067] If the desired location of the further edge portion 304 on the receiving section 306 is reached, the lifting device 104 and the clamping device 103 release the edge portion 303 of the stack 101. In a next step, the supporting table 102 moves away from the receiving section 306. Furthermore, a pushing platform 307 may push the stack 101 from the supporting table 102. The edge portion 303 then falls onto the receiving section 306 and the whole stack 101 is thereby arranged in the receiving section 306 for a further proceeding.

[0068] It should be noted that the term comprising does not exclude other elements or steps and a or an does not exclude a plurality. Also elements described in association with different embodiments may be combined. It should also be noted that reference signs in the claims should not be construed as limiting the scope of the claims.

REFERENCE SIGNS

[0069] 100 handling system [0070] 101 stack [0071] 102 supporting table [0072] 103 clamping device [0073] 104 lifting device [0074] 105 lifting element [0075] 106 further lifting element [0076] 107 lifting direction [0077] 108 clamping direction [0078] 109 bending axis [0079] 110 deforming axis [0080] 111 supporting surface [0081] 112 supporting plane [0082] 113 first part [0083] 114 second part [0084] 301 moving direction [0085] 302 central portion [0086] 303 edge portion [0087] 304 further edge portion [0088] 305 wheel element [0089] 306 receiving section [0090] 307 pushing platform [0091] 308 transport device [0092] 309 supporting platform [0093] 310 moving direction of transporting device [0094] 311 hold down element [0095] 312 processing device