Patent Application
20100135763
The invention relates to an apparatus for aligning an item that can be deformed easily, at least in the region of the outer lower edge, such as a stack of items comprising in particular flat structures made of a flexible material, such as paper or the like, on a transport substrate, such as a pallet, at least one aligning device that can be displaced in the direction of the item and the transport substrate being provided to align the item on the transport substrate.
Apparatuses of this type are used in practice in order, for example, to align the item in relation to the transport substrate before the packaging operation and after the loading operation.
Alignment is necessary in order that the item is arranged within the contour of the transport substrate since regions of the item projecting beyond the contour can be damaged during subsequent transport, for example by adjacent pallets.
Known aligning devices comprise two continuous displaceable walls, which are assigned to each other horizontally or vertically and which in each case are moved in parallel or together in the direction of the item and in this way the item is aligned in relation to the transport substrate.
The alignment of flat structures in particular, such as stacks of paper, proves to be problematical. For example, when paper is being cut to size, crosscutters are used, as a result of the which the paper stack may not be positioned centrally on the transport substrate but instead may project by up to 40 mm on the longitudinal side and/or the transverse side of the transport substrate. Since paper can be damaged very easily in the region of the projection during transport, alignment is required in particular under all circumstances in the case of stacks of paper.
Previously known mechanical devices cannot be used since, during the alignment with these devices, the lower edges are bent downward as a result of the fore of the alignment device and can be clamped in between the transport substrate and the aligning device. Apart from the fact that the bent-down sheets can no longer be used, the bent-down sheets also prevent further displacement, so that satisfactory alignment is not possible. Given a lack of technical solutions, the stacks of paper are therefore aligned by hand. Here, in the region of the projection, the transport substrate is moved into the desired position by means of specific blows.
It is therefore an object of the invention to improve a known apparatus in such a way that an item projecting laterally beyond the outer contour of a transport substrate can be moved mechanically into the contour of the transport substrate and damage to the item during alignment can be avoided.
This object is achieved in that at least the subregion of at least one aligning device which comes into contact with the lower region of the item projecting laterally beyond the outer contour of the transport substrate during the alignment of the item on the transport substrate is assigned a stabilizing device which prevents the item being deflected in the direction of the transport substrate.
During the displacement of the item, if the latter is formed as a stack of paper, the stabilizing device in particular prevents the lower sheets bending over downward and being turned over, and in this way the item can be pushed at least sufficiently far that it terminates flush with the contour of the transport substrate. The aligning device can be formed, for example, as a displaceable wall. However, it is also entirely possible for appropriate displaceable walls to be provided on two opposite sides, between which the item is aligned.
The stabilizing device can include a layer which inhibits slipping. In this way, the friction between the aligning device and the item is increased, so that slippage of the item, in particular when this is a stack of paper, in the region of the edge in contact with the aligning device is prevented.
It is recommended that the stabilizing device includes a compliant element. This has the effect that, during displacement, the compliant element bears from below on the lower edge of the item and in the process exerts a supporting force on the item such that bending over or turning over of the lower region of the item is prevented.
The element can be made of rubber, for example, such as foam rubber or cellular rubber.
Other embodiments of a stabilizing device are possible. For example, the stabilizing device can comprise a supporting device for supporting the item. This can be, for example, an angle integrally molded on the aligning device, which can be used when transport substrates of a defined height are employed. This angle supports the item on the underside.
In another embodiment, the stabilizing device can have a supporting surface adjoining the contact surface of the transport substrate laterally at a short distance, at least during the alignment, and at least approximately aligned with the contact surface. This supporting surface can be moved into its operating position, for example by moving in the direction of the transport substrate or by pivoting. The height of the supporting surfaces can preferably be varied, so that transport substrates of different heights can also be employed. In the operating position of the supporting surface, the aligning device which, for example, is formed as a displaceable wall, is moved along the upper side of the supporting surface at a short distance, so that when the aligning device is displaced in the direction of the item, the item is displaced and the lower flat structures of the item are protected by the supporting surfaces against being bent over.
The aligning devices can be formed in one piece. However, it is also entirely possible for the aligning devices to be formed in many parts, at least in an upper and a lower segment, in relation to the height of the item, and the stabilizing device can be provided at least on the lower segment.
In this case, it is recommended that the adjacent edges have mutually at least approximately corresponding edge curves with projecting and set-back subregions, in particular are formed in the shape of a wave and interengaging. if the aligning device is formed in two parts, it is recommended for the stabilizing device, if it includes a compliant element, to be provided at least in the lower segment. In this case, it is recommended for the upper segment to be capable of being moved onward in the direction of the item at least by the thickness of the compliant element in the compressed state, in order to prevent an edge offset in the region of the item.
The height of at least one aligning device is matched to the upper edge of the transport substrate in such a way that movement beyond the edge of the transport substrate is possible. This makes it possible for the item to be displaceable beyond the edge on the transport substrate.
The invention also relates to a method for aligning an item that can be deformed easily, at least in the region of the outer lower edge, such as a stack of items comprising in particular flat structures made of a flexible material, such as paper or the like, on a transport substrate, such as a pallet, at least one aligning device that can be displaced in the direction of the item and the transport substrate being provided to align the item on the transport substrate.
Alignment methods are carried out in practice in order, for example, to align the item in relation to the transport substrate before the packaging operation and after the loading operation.
Alignment is necessary in order that the item is arranged within the contour of the transport substrate since regions of the item projecting beyond the contour can be damaged during subsequent transport, for example by adjacent pallets.
In known alignment methods, aligning devices are used which comprise two continuous displaceable walls, which are assigned to each other horizontally or vertically and which in each case are moved in parallel or together in the direction of the item and in this way the item is aligned in relation to the transport substrate.
The alignment of flat structures in particular, such as stacks of paper, proves to be problematical. For example, when paper is being cut to size, crosscutters are used, as a result of the which the paper stack may not be positioned centrally on the transport substrate but instead may project by up to 40 mm on the longitudinal side and/or the transverse side of the transport substrate. Since paper can be damaged very easily in the region of the projection during transport, alignment is required in particular under all circumstances in the case of stacks of paper.
Previously known mechanical devices cannot be used since, during the alignment with these devices, the lower edges are bent downward as a result of the force of the alignment device and can be clamped in between the transport substrate and the aligning device. Apart from the fact that the bent-down sheets can no longer be used, the bent-down sheets also prevent further displacement, so that satisfactory alignment is not possible. Given a lack of technical solutions, the stacks of paper are therefore aligned by hand. Here, in the region of the projection, the transport substrate is moved into the desired position by means of specific blows.
It is therefore an object of the invention to specify a method with which an item projecting laterally beyond the outer contour of a transport substrate can be moved mechanically into the contour of the transport substrate and damage to the item during alignment can be avoided.
This object is achieved in that a downward deflection of the lower region of the item projecting laterally beyond the outer contour of the transport substrate is prevented by a stabilizing device which is assigned to at least the subregion of the aligning device which comes into contact with the region of the item projecting laterally beyond the outer contour of the transport substrate during the alignment of the item on the transport substrate. During the displacement of the item, if the latter is formed as a stack of paper, the use of the stabilizing device in particular prevents the lower sheets bending over downward and being turned over. In this way the item can be pushed at least sufficiently far that it terminates flush with the contour of the transport substrate. The aligning device(s) can be formed, for example, as a displaceable wall. However, it is also entirely possible for appropriate displaceable walls to be provided on two opposite sides, between which the item is aligned.
In this case, before the alignment of the item on the transport substrate, the transport substrate can for its part be aligned in relation to at least one aligning device. For this purpose, use can be made for example of stoppers, which are preferably arranged transversely with respect to the conveying direction and are moved against the transport substrate. As a result, the transport substrate is aligned parallel with the conveying direction.
In order to reduce friction between the underside of the item and the contact surface of the transport substrate, a friction-reducing layer can be provided. In this way, the item can be displaced more easily on the transport substrate.
A thin sheet can be laid on the transport substrate as a layer before the loading of the transport substrate with the item. In another embodiment, a film, in particular an oil film, can be applied to the underside of the item as a layer.
In the following text, an exemplary embodiment of the invention illustrated in the drawings will be explained. In the drawings:
In all the figures, the same designations are used for the same or identical components.
In
On the underside, the transport substrate 1 stands on a roller conveyor 3. By means of this roller conveyor 3, the transport substrate 1 with the item 2 located on it is, for example, moved from a loading device to the apparatus according to the invention, the transport substrate 1 previously being aligned with respect to the roller conveyor 3 in order that the transport substrate 1 is aligned parallel to the conveying device 4. For this purpose, for example, stoppers arranged transversely with respect to the conveying device 4 and against which the transport substrate 1 is moved can be provided in the roller conveyor 3.
In order to align the item 2, the apparatus, as illustrated in
In the exemplary embodiment illustrated in
The aligning devices 5 are held in a supporting construction 10 by roller arrangements 9. During alignment, first of all the left-hand aligning device 5 illustrated in
For the case in which alignment and thus movement of the item 2 beyond the contour of the transport substrate 1 is desired, the aligning devices 5 have to be matched to the height of the transport substrate 1 in such a way that the aligning devices 5 in the lower region can be moved over the upper edge of the transport substrate 1.
The compliant material used can be, for example, a foam rubber or a closed-cell, resilient cellular rubber having cell sizes of 0.2 to 0.5 mm. In this case, the surface of the material coming into contact with the item 2 is preferably formed so as to be closed, so that air escaping during compression must necessarily emerge via the front edges, of which the area is smaller.
In the exemplary embodiment illustrated in
In
The upper segment 13 is preferably moved further in the duration of the item 2 by the thickness of the stabilizing device 8 in the compressed state. In conjunction with the interengaging edge curves, an offset within the side edge of the item 2 can thus be avoided.
In order to reduce the friction between the item 2 and the transport substrate 1, a friction-reducing layer can be provided. For example, the lowest paper layer can be oiled. However, it is also entirely possible to provide a thin sheet between the transport substrate 1 and the lowest paper underlayer, said thin sheet preferably having a low coefficient of friction.
The provision of a thin sheet proves to be advantageous in as much as a thin sheet cover subsequently drawn over the item 2 following the alignment can be welded to the thin sheet and in this way the item 2 is protected against moisture.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202004002488.8 | Feb 2004 | DE | national |
| 202004003136.1 | Feb 2004 | DE | national |
This application is a divisional of Ser. No. 10/552,431, filed Oct. 5, 2005, the entirety of which is incorporated herein by reference thereto.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 10552431 | Oct 2005 | US |
| Child | 12701871 | US |
