EP1353847B1 - Device for wrapping a stack of goods - Google Patents

Abstract

An apparatus for wrapping an object with a stretchable foil hood has a pair of gathering fingers engageable upwardly into the foil hood, two gathering wheels outside the foil hood, rotatable about gathering-wheel axes, and engageable with the hood, and respective counter rolls inside the foil hood, aligned with the gathering wheels to pinch the foil hood, and rotatable about counter-roll axes below the respective gathering-wheel axes. The gathering wheel are rotated while in contact with the foil to form the foil into downwardly and outwardly extending folds.

Description

The invention relates to a device for wrapping a stack of goods with an at least approximately dome-shaped, elastic film section, which is gathered on a gathering device and then, in particular by a movable along the stack stacker, stretched in the circumferential direction and pulled over the stack, wherein the gathering device at least two Rafffinger and at least on a connecting line, in particular on two opposite connecting lines, between two adjacent Rafffingern each at least one roller assembly consisting of a standing with the outside of the film section in contact Raffrad and one of the Raffrad substantially opposite, with the inside of the film section having in contact and the film section between them and the Raffrad for transport trapping enclosing counter-roller, whereby the film section through the roller assembly (s) on the Rafffin is preferably like a concertina in the vertical direction.

By means of such a device, a film section is zerkharmonikaartig in the longitudinal direction and then stretched in the circumferential direction. In this prestressed state, the gathering device with the accordion-like shirred film section thereon or the coating device-if the shirred film section is previously laid down on one of these-moves down the stack of goods, with the shirred film section being drawn off and resting on the outside of the material stack. In this case, the shirred film section can be stretched only after the transfer of the stalling device.

In a known device for shirring the film section on two opposite connecting lines between two adjacent reach fingers each provided a roller assembly consisting of a Raffrad and a counter-roller. From the outside, the Raffrad and the inside of the counter-roller with the film section in contact, so that the film section between the Raffrad and the counter-roller is clamped enclosed. The axis of rotation of the counter-roller is, with respect to the shirred end of the film section, which is usually gathered in the vertical direction, arranged above the axis of rotation of the Raffrades.

Another device is known from DE-C-197 32 298, wherein the Rollenanordung consists of a Raffrad and two counter-rollers.

As a disadvantage of this prior art device proves that the folds of the shirred end of the film section does not always have a uniform orientation and not all wrinkles resulting from the gathering obliquely downwards and outwards, but also partially obliquely downwards and inwards. If such a gathered film section is then pretensioned and pulled over the stack, a uniform stripping of the gathered film section is not possible since the downward and outward-pointing folds prevent the downward and inward-pointing wrinkles due to the high pretensioning.

The object of the invention is therefore to improve a device described above so that a perfect shirring is possible.

This object is achieved in that the axes of rotation of each Raffrad and counter-roller of at least one roller assembly are arranged such that the tangent in the respective contact point of the corresponding Raffrades and the associated Raffrades to achieve a uniform, with their folds respectively obliquely downwardly and outwardly pointing wrinkling Counter role of the roller assembly also obliquely down and out points. This ensures that by the special orientation of the two axes of rotation of Raffrad and counter-roller to each other, the film section is draped accordion-like, the folds always have a regular, obliquely down and outward orientation. Due to this uniform wrinkling of the film section can be easily deducted when coating the stack.

An advantage of such a device is that the uniform alignment of the folds formed by the gathering without expensive device and without a variety of moving and possibly maintenance-intensive components.

The to be wrapped stack can not only be stacked goods such. As bags, but it may also be, for example, products from the white area such. B. refrigerators act, which are provided before wrapping with edge protection elements made of styrofoam. Also, it is quite possible that the stack of goods are arranged on a pallet, in which case preferably the film section on the underside to the stack carrying the good Pallet is hit. As a film section, for example, a prefabricated hose section or a hood can be used.

If the device has a gathering device and a separate pull-on device, the film section gathered in the concertina-like manner by the gathering device is deposited on holding elements of the coating device. Then, the holding elements are moved apart, for example by means of a tension drive, whereby the film section is biased in the circumferential direction. In this state, the holding elements along the stack of goods downwards or upwards or else the stack of goods with respect to the holding elements off or moved up, wherein the shirred film section is subtracted from the holding elements and rests against the outside of the stack.

But it is also quite possible that the shirring not only ruffles the film section, but also stretches and stretches or stretches. In this case, the coating device is provided only for later coating the film section over the stack.

If only two Rafffinger are provided, the width of these opposing Rafffinger is slightly larger than the width of two opposite sides, preferably the narrow sides of a stack to be wrapped. The roller arrangement (s) can either be integrated in the Rafffingern or located on the connecting line between two adjacent edges of the opposite Rafffinger.

In a preferred embodiment of the invention, the axis of rotation of the Raffrades is at an angle of about 105 ° arranged on the general extent of the shirred film section.

Conveniently, the axes of rotation of the respective Raffrad and counter-roller of all roller assemblies are arranged such that the tangent in the respective contact point of the corresponding Raffrades and the associated counter-roller of each roller assembly also has obliquely downwards and outwards. This ensures that the film section is gathered over its entire circumference evenly in obliquely downward and outward-facing folds.

At least one Raffrad can be driven thereby.

In this case, the diameter of at least one Raffrad be greater than the diameter of the associated counter-roller. Such an embodiment is useful when the shirring device is used as a stalling device at the same time. Since the counter-rollers must not come into contact with the outside of the stack when covering the film section on the stack, the film section must be so far not stretched so strong due to the smaller diameter of the counter-roll.

It is advantageous if the gathering device has four Rafffinger, in particular as an angle-shaped Raffecken, which are then in the range of four Grundrissecken a square pallet.

If the distance between two adjacent rapier fingers is relatively large, it makes sense if at least on a connecting line between two adjacent rapier fingers two roller arrangements are provided.

It is also quite possible that the gathering device is designed at the same time as a puller device which can be moved along the stack of goods. In this case, the shirring not only gathers the film section, but stretches it at the same time and pulls it over the stack. Of course, then the gathering device is designed so that it is movable along the stack of goods. It then requires no separate stalling more.

Fig. 1

eine Seitenansicht auf einen Gutstapel mit einer Raffeinrichtung und einer separaten Überziehvorrichtung und

Fig. 2

eine Detailansicht auf eine Rollenanordnung.

In the following, an embodiment of the invention shown in the drawings will be explained. Show it:

Fig. 1

a side view of a stack with a shirring and a separate squeegee and

Fig. 2

a detailed view of a roller assembly.

In both figures, the same reference numerals are used for identical or similar components.

Fig. 1 shows a device for wrapping a stack of goods 1, the u. a. a shirring device 2 has. In the illustrated case, the stack 1 consists of several packages. This may of course also another packaged goods, such. B. bags, which are preferably stacked on a pallet. But it is also quite possible that it is in the stack 1 to a so-called white device such. B. is a washing machine, which is to be wrapped with a film section 3.

The gathering device 2 has on each of two opposite sides of the film section 3 a respective roller arrangement 4 and pivotable gathering fingers 5. These Rafffinger 5 are on the inside of the film section 3, wherein the gathering fingers 5 are angled obliquely to the horizontal and oriented towards the center of the stack 1.

Each roller assembly 4 consists of a Raffrad 6 and a counter-roller 7. The Raffrad 6 stands with the outside of the film section 3 in contact, while the counter-roller 7 inside the film section 3 touches. The counter-roller 7 is rotatably mounted on the Rafffinger 5. Between the Raffrad 6 and the counter-roller 7 of the film section 3 is trapped by clamping, so that this is zieharonikaartig gathered in folds 12 on the Rafffingern 5.

As can be clearly seen in Figures 1 and 2, the axis of rotation 8 of the Raffrades 6 and the axis of rotation 9 of the associated counter-roller 7 of a roller assembly 4 are not arranged at the same height. Rather, the axis of rotation 8 of the Raffrades 6 is arranged above the axis of rotation 9 of the counter-roller 7, so that a tangent 10 in the contact point 11 of the Raffrades 6 and the associated counter-roller 7 obliquely downwards and outwards. This ensures that the film section 3 is gathered into folds 12, wherein all of these folds 12 are also aligned obliquely down and out. The angle between the folds 12 and the general extension of the shirred film section 3 in the shirred and unstretched state is approximately 20 ° to 60 °, in particular 45 °.

As shown in particular in Fig. 2, the axis of rotation 8 of the Raffrades 6 is approximately at an angle of 15 ° to the imaginary line 13 which extends horizontally in this orientation of the shirring device 2 through the axis of rotation 9 of the counter-roller 7. In that regard, the angle between the axis of rotation 8 of the Raffrades 6 for the general extent of the shirred film section 3 about 105 °.

As can be seen from Figures 1 and 2, the general orientation of the shirred film section 3 is approximately vertical. But it is also quite possible that the distance of the Rafffinger 5 z. B. decreases slightly downwards.

After shirring of the film section 3, the distance of the gathering fingers 5 is changed by moving the shirring device 2 in the direction of the arrow 14 to stretch and stretch or stretch the film section 3, so that the film section 3 is biased. The thus-biased film section 3 is then received by holding elements 15 of a coating device 16, wherein these holding elements 15 for this purpose engage in the interior of the prestressed film section 3. After the holding elements 15 by moving in the direction of the arrow 17 on the inside with the prestressed and shirred film section 3 into contact, the gathering fingers 5 fold away in the direction of the arrows 18. The coating device 16 is then moved with the film section 3 in the direction of the arrows 19 on the outside along the stack 1. The shirred film section 3 remains hanging on the upper edge of the stack 1, is deducted from the holding elements 15 and lays on the outside of the stack 1 or a possibly arranged below pallet.

It is quite possible that stretching or stretching of the film section 3 also takes place through the holding elements 15 of the coating device 16. In this case, only the shirring takes place on the Rafffingern 5 of the shirring 2, while the stretching and stretching or Stretching and the subsequent coating of the film section 3 on the stack 1 by means of the holding elements 15 of the puller 16 takes place.

If the separate coating device 16 is dispensed with, the gathering device 2 is movably arranged along the product stack 1, wherein the gathering device 2 gathers the film section 3, stretches it and at the same time covers it over the material stack 1.

FIG. 2 shows another embodiment of a gathering device 2. Here, as gathering fingers 5 in the area of the floor corner corners of the product stack 1 to be wrapped, horizontally arranged and angularly formed tubes (Racke corners) are provided. Each Raffecke is connected via a likewise angled plate 20 with a profile 21, which in turn is attached to a carriage, not shown.

As can be clearly seen, the tangent 10 at the contact point 11 between the Raffrad 6 and the counter-roller 7 obliquely downwards and outwards, so that in this respect, the folds 12 of the shirred foil section 3 have a corresponding uniform orientation.

Due to the uniform alignment of the folds 12 of the film section 3 can be easily peeled fold 12 for fold 12 when coating the stack 1 of the holding elements 15 of the puller 16. In contrast to previously known devices, in which no uniform alignment of the folds 12 can be achieved and in which the folds 12 are directed outward and partially inward, therefore not two superimposed simultaneously Folded out 12 folds (orientation once inwards and once outwards).

The shirred film section 3 shown in FIGS. 1 and 2 is supplied from above by a film feed device (not shown) or a packaging device of the shirring device 2.

Claims (8)

1. Apparatus for wrapping a stack of goods (1) with a resilient film portion (3), which has at least a substantially hood-like configuration and is gathered on a gathering device (2) and subsequently stretched in the circumferential direction, more especially by a covering apparatus (16) which is displaceable along the stack of goods (1), and drawn over the stack of goods (1), the gathering device (2) including at least two gathering fingers (5) and at least one respective roller arrangement (4) on at least one connecting line, more especially on two oppositely situated connecting lines, between two adjacent gathering fingers (5), said roller arrangement comprising a gathering wheel (6), which is in contact with the external surface of the film portion (3), and a counter-roller (7), which is situated substantially opposite the gathering wheel (6), is in contact with the internal surface of the film portion (3) and encloses the film portion (3) between itself and the gathering wheel (6) for transportation purposes in a clamping manner, whereby the film portion (3) is gathered in a concertina-like manner by the roller arrangement(s) (4) on the gathering fingers (5) substantially in the vertical direction, characterised in that, to achieve a uniform fold formation which points with its folds (12) respectively inclinedly downwardly and outwardly, the rotary axles (8, 9) of the respective gathering wheel (6) and counter-roller (7) of at least one roller arrangement (4) are disposed in such a manner that the tangent (10), at the respective contact point (11) of the appropriate gathering wheel (6) and of the associated counter-roller (7) of the roller arrangement (4), also points inclinedly downwardly and outwardly.
2. Apparatus according to claim 1, characterised in that the rotary axle (8) of the gathering wheel (6) is disposed at an angle of substantially 105° relative to the general elongation of the gathered film portion (3).
3. Apparatus according to claim 1 or 2, characterised in that the rotary axles (8, 9) of the respective gathering wheel (6) and counter-roller (7) of all of the roller arrangements (4) are disposed in such a manner that the tangent (10), at the respective contact point (11) of the appropriate gathering wheel (6) and of the associated counter-roller (7) of each roller arrangement (4), also points inclinedly downwardly and outwardly.
4. Apparatus according to one of claims 1 to 3, characterised in that at least one gathering wheel (6) is drivable.
5. Apparatus according to one of claims 1 to 4, characterised in that the diameter of at least one gathering wheel (6) is greater than the diameter of the associated counter-roller (7).
6. Apparatus according to one of claims 1 to 5, characterised in that the gathering device (2) includes four gathering fingers (5), more especially in the form of angularly configured gathering corners.
7. Apparatus according to one of claims 1 to 6, characterised in that two roller arrangements (4) are provided at least on one connecting line between two adjacent gathering fingers (5).
8. Apparatus according to one of claims 1 to 7, characterised in that the gathering device (2) is simultaneously configured as a covering apparatus (16), which is displaceable along the stack of goods (1).

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