The invention relates to a cardboard packer, in particular to a cardboard packer for producing boxes, trays, and/or wrap-around units for a plurality of carton packages. The invention also relates to a blank picker for such cardboard packer, as well as to a method for a cardboard packer.
Individual packaging containers, such as liquid food packaging containers, are typically produced from a carton-based material and filled using a high-speed filling machine. When the filled, formed, and sealed packaging containers are unloaded from the filling machine they are transferred to a cardboard packer in which a predetermined number of packaging containers are stacked in a packing pattern and placed in a case made from a cardboard blank.
The case, which may be in the form of a box, a tray, or a wrap-around unit is produced by folding the blank; the blank may e.g. be formed by cutting a corrugated cardboard sheet or the like into a predetermined shape. The shape of the blank varies in accordance with the dimension and number of packaging containers to be placed in the case, and the manner of packaging. In the case of a tray blank, the blank sheet has a shape to cover two opposing side surfaces of a group of packaging containers which have been stacked on the blank sheet in a predetermined packing pattern. In the case of a wrap-around blank, the blank sheet has a shape to wholly cover a group of packaging containers which have been stacked on the blank sheet in a predetermined packing pattern.
The cardboard packer is provided with a blank magazine, and a blank picker which takes out a single blank at a time from the magazine, typically using a suction force. After picking the blank, it is received by a feeder configured to fold and transport the blank. Subsequently, a group of packaging containers which have been conveyed by a conveyor is placed on the blank, and the blank is formed into a cardboard package enclosing or carrying the packaging containers.
Correct positioning of the blank relative the feeder is of high importance in order to obtain correctly shaped and dimensioned cardboard packages, and consequently also correct handling and storage of the individual packaging containers.
There is thus a need for an improved cardboard packer, and in particular for an improved blank picker, allowing for improved positioning of the cardboard blank in the feeder.
It is an object of the invention to at least partly overcome one or more of the above-identified limitations of the prior art. In particular, it is an object to provide a cardboard packer which improves the positioning of the blank by reducing the risk for unpredictable movements of the blank e.g. caused by two adjacent blanks being stuck to each other in the magazine either because of two high pressure acting on them or one of the blanks being damaged and sticking to its neighbor.
According to a first aspect, a cardboard packer is provided. The cardboard packer comprises a blank magazine, a blank feeder, and a blank picker for transporting a single blank from the magazine to the feeder, wherein the blank picker comprises an upper picking unit configured to attach to an upper portion of the blank, and a bottom picking unit configured to attach to a bottom portion of the blank. Being able to pull the blank from the upper portion as well as from the bottom portion has proven to greatly improve positioning of the blank, especially during the initial motion of the blank when being released from the magazine.
In an embodiment the bottom picking unit comprises at least two spaced-apart picking devices. The picking devices of the bottom picking unit may be distributed horizontally, whereby fixation of the blank is improved especially for large size blanks.
The picking devices of the bottom picking unit may be distributed to attach to a respective bottom corner of the blank. The blank may thereby be pulled from the bottom corners, which reduces unpredictable movement of the blank due to pressure difference between the atmosphere and the area between two adjacent blanks.
The upper picking unit and/or the bottom picking unit may be configured to attach to the blank by applying suction force. Thereby a simple construction may be implemented.
The cardboard packer may further comprise a control unit connected to at least the bottom picking unit for activating the bottom picking unit. The control unit may be programmed to activate the bottom picking unit according to a first actuation scheme, whereby the first actuation scheme is different from a second actuation scheme used to activate the upper picking unit. Individual control of the upper and bottom picking units may reduce the complexity of the cardboard packer, as the bottom picking unit may be used to move the blank away from the magazine instead of providing full transport to the feeder.
The second actuation scheme may be designed to activate the upper picking unit during full transport of the blank from the magazine to the feeder, while the first actuation scheme is designed to activate the bottom picking unit during initial transport of the blank from the magazine towards the feeder.
According to a second aspect, a blank picker for transporting a single blank from a magazine to a feeder of a cardboard packer is provided. The blank picker comprises an upper picking unit configured to attach to an upper portion of the blank, and a bottom picking unit configured to attach to a bottom portion of the blank.
According to a third aspect, a method for transporting a blank from a from a magazine to a feeder of a cardboard packer is provided. The method comprises arranging a blank picker in close proximity to a blank of the magazine, activating the blank picker such that an upper picking unit of the blank picker attaches to an upper portion of the blank, and a bottom picking unit of the blank picker attaches to a bottom portion of the blank, moving the blank picker towards the feeder, and de-activating the blank picker when the blank is arranged at the feeder.
De-activating the blank picker may comprise de-activating the bottom picking unit before de-activating the upper picking unit.
Activating the blank picker may be performed such that the upper picking unit attaches to the upper portion of the blank simultaneously as the bottom picking unit attaches to the bottom portion of the blank.
Still other objectives, features, aspects and advantages of the invention will appear from the following detailed description as well as from the drawings.
Embodiments of the invention will now be described, by way of example, with reference to the accompanying schematic drawings, in which
With reference to
The cardboard packer 10 is fed with a blanks magazine 12. The magazine 12 contains a number of separate blanks, stacked on top of each other in the magazine 12. The cardboard packer 10 is also receiving a flow of individual packaging containers 14, such as carton packaging containers 14 filled with a liquid food product or other suitable content, may it be in solid form or in liquid form.
The cardboard packer 10 comprises a blank picker 100 which is configured to access the magazine 12 and grip one blank at the time, and to move the blank from the magazine 12 to a blank feeder 20. The blank feeder 20 is preferably configured to perform initial folding and forming of the blank towards the final cardboard package 30. Hence, the feeder 20 is in some way configured to also receive the carton packaging containers 14, and to arrange them within the cardboard package 30.
As is clear from
In
Now turning to
As can be seen the magazine 12 is somewhat slanted. The exact orientation of the magazine 12 may vary, as well as the exact number of blanks contained in said magazine 12. The position of the magazine 12 may be adjustable in the vertical direction, such as adjustable in the plane of the blanks.
Since the magazine 12 is in a raised position, the load imposed on the front blank can be reduced, thereby facilitating the taking out of the blank by the blank picker 100.
The upper picking unit 110 is arranged on a guide 112 configured to move the upper picking unit 110, and in particular one or more picking devices 114 of the upper picking unit 110, from the magazine 12 to the feeder 20.
In a similar manner the bottom picking unit 120 is arranged on a guide 122 configured to move the bottom picking unit 120, and in particular one or more picking devices 124 of the bottom picking unit 120, from the magazine 12 towards the feeder 20.
Preferably, at least the bottom picking unit 120 comprises two or more picking devices 124 distributed horizontally; in one preferred embodiment there is one picking device 124 arranged to attach to one bottom corner of the blank, while another picking device 124 is arranged to attach to the other bottom corner of the blank. One or more picking devices 124 may be arranged between the “corner” picking devices 124.
As can be seen in
Activation of the picking units 110, 120 is performed by one or more control signals of the control unit 40 (see
As soon as the picking devices 114, 124 are activated and gripping the blank, the picking units 110, 120 start to move towards the feeder 20. Upon this movement the gripped blank 50 will be released from the magazine 12, as indicated in
The main purpose of the bottom picking unit 120 is to provide robustness to the initial motion of the blank 50, i.e. when it is released from the magazine 12. However, due to some irregularities immediately when the blank 50 is released the bottom picking unit 120 may maintain its grip of the blank 50 for some time during transport towards the feeder 20.
As is shown in
In
In accordance with the sequence shown in
After delivering the blank 50 to the feeder 20, the blank picker 100, i.e. the upper picking unit 110 as well as the bottom picking unit 120, is returned to its gripping position shown in
Now turning to
The method 200 continues by a step 206 of moving the blank picker 100 towards the feeder 20, and a final step 208 of de-activating the blank picker 100 when the blank 50 is arranged at the feeder 20.
The final step 208 of de-activating the blank picker 100 is preferably performed such that the bottom picking unit 120 is de-activated before the upper picking unit 110.
Yet further, the step 204 of activating the blank picker is preferably performed such that the upper picking unit 110 attaches to the upper portion of the blank 50 simultaneously as the bottom picking unit 120 attaches to the bottom portion of the blank 50.
From the description above follows that, although various embodiments of the invention have been described and shown, the invention is not restricted thereto, but may also be embodied in other ways within the scope of the subject-matter defined in the following claims.
Number | Date | Country | Kind |
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19207731.1 | Nov 2019 | EP | regional |
Filing Document | Filing Date | Country | Kind |
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PCT/EP2020/080388 | 10/29/2020 | WO |