ES2347481T3 - PROCEDURE AND DEVICE FOR THE PACKAGING OF A PRODUCT IN A TREAT OF A PACKING MATERIAL WITH WRAPPED WRAPPING. - Google Patents

Abstract

The method involves closing the packaging enclosing the gathered region of the packaging enclosing the product with a clip by folding or bunching the section of packaging material about the product so that it encloses the product with one side exposed, gathering the section of packaging material above the product on the exposed side to form a neck and closing the neck to apply a clip. The neck of the packaging material is fixed when closed and the clip is continuously fed as a continuous clip tape. An independent claim is also included for an arrangement for packaging a product in a section of packaging material.

Description

Procedure and device for packaging a product in a piece of a wrapping packaging material by girdle

The invention relates to a method and a device for packaging a product in a piece of a packing material with wrap by wrap.

Product packaging in a wrapper formed by tightness requires for a safe closure of the container the application of a closure strip (also called from here on forward clip) in the area of the packaging material collected on Himself by girdle.

Devices are known for closing bags using a clip in which the neck of the bag formed it goes through a device and with it the clip is folded around the tight packaging material. Devices of this type work in most cases passively, passing the operator the container to be manually closed by the equipment. With this you have a clear limit for performance and also fluctuates markedly clip application quality. Fluctuations are possible p. ex. those of which the ends of the clip are not exactly folded one on another, or the ends of the clip have different lengths

They are also known procedures and devices in which both the training going on the packaging material by a folding box (collection) such as the clip application on a neck site of packaging material tight are done in an automated way.

This is known from document DE 199 55 667 B4 a procedure for the packaging of individual chocolates in the that the candy is put on a sheet that is on a first piece of form, the bonbon with the foil is pressed under pressure to through an opening made in the shape piece, and together with the bonbon put on the sheet is sucked down through the opening the sheet on the side that has its back to the chocolate. Then the sheet on top of it is collected by tightening on itself of the bonbon thus forming with it a cone made by folded, and this is fixed by a self-adhesive tape that is in Particularly made of paper. Both the meeting of the chocolate and the piece of packaging material as well as the formation by means of a folding box and clip application are operations that have place immediately consecutively. Here, through the vacuum assistance the bonbon is aspirated and taken down to through a folding box (piece of form), and with it is given The shape to the packaging material. Then while the bonbon is found along with the packaging material in a additional piece of form is made to wrap the packaging material and a clip is applied. This principle assumes however a performance limitation, because they must first be done by complete all processing steps consisting of the meeting of the piece of packaging material with the product and the folding and wrapping of the packaging material until the clip application, before the product can be packaged next. An additional disadvantage is that which consists in the fact that for a practicable opening of the container can be used just a strip of paper that has to be torn for the opening of the container On the contrary, it cannot be torn apart a clip made of plastic.

By US-A-1,869,116 is known a device for closing bags in which it is first cut a wire that is provided continuously and then and after a previous bending in a corresponding mandrel the wire around a tight bag neck and is made of such way the closure.

From DE 24 19 072 A1 are known a procedure and a corresponding device for closing similar bags or wraps in which the end of a bag with pocket shape or tubular shape is collected on itself and it holds together with itself through a closure that consists at least of a strip.

Here the strips of a pair of strips are joined mutually by one of its ends, they pass by around the end collected on itself from a bag and join for the closure so that they surround the way of a staple to the end collected on itself from the bag. Additionally, the pieces of attached strips are cut apart from the remaining strips so such that the remaining strips remain joined by the corresponding extremes for the new execution of process.

By EP 0 231 939 A1 a device for automatic closure of bags and wraps similar by adhesive strip, where a transport wheel that is operatively in connection with a fixed guide track, presents slits for the admission of collected bag necks about themselves by girdling in the area of their opening and it is driven is in connection with a tape feed roller adhesive that has concavities in the periphery for introduction of bag necks taken together in the manner of a string and is dragged in rotation by bag collars, as well as with an adhesive tape closure device and with A cutting blade.

Against this, the purpose of this invention is to make it possible with a view to the obtaining an adequate level of quality automatic training of a wrap wrap with clip closure at a high level performance in which the application is additionally achieved of the clip take place at a high and uniform level of quality. So, the ends of the clip folded over each other should be mutually overlapping as accurately as possible (parallelism) and must have equal lengths. The clip It should also always be arranged in the same place container. In addition, the container must also be able to close use a clip made of plastic.

This purpose is achieved through the procedure described in claim 1 and the device described in claim 16.

Thanks to the fact that the material neck of packaging is fixed upon closing, it is possible to achieve consistent neck formation of packaging material, which to then set additionally, p. ex. through the elements of support, while closing the clip around the neck of material of packaging. Thanks to this, a tight fit is achieved. further a very accurate clip closure formation is possible.

The clip is also provided continuously in the form of endless clip tape. In the sense in which it is used in the invention, the word "continuous" means that individual clips are not provided, but that roll tape is provided or by meters. The endless belt of the clip to be processed can be continuously unwound from a roll and thus contributed to the equipment. Here you can use p. ex. rolls of strip-shaped material that is coated with a self-adhesive layer, or the use of cold or hot sealing layers or the coating of the strip-shaped material after having been wound from the roll and immediately before it is also conceivable of being contributed to the team. Likewise, strip-shaped material can be processed in the equipment, which, after debinding from the roll, separates from a support material analogously to what is done in the case of a label, whereby the layer is accessible
adhesive

The packing material neck is fixed preferably when closing above and below the closing site or clip site.

For the girdle for neck formation of narrow packaging material, according to the invention, the piece of packaging material is collected by tightening on itself by elements that are mobile to approach each other so form a neck This is achieved through the tightening that is done. through the mutual approach of a girdle pusher and a girdle wheel To do this, the girdle team features a girdle pusher and a girdle wheel that are configured in particular to make a move relative mutual approximation.

With this, the girdle pusher sticks to the piece of packaging material using supporting elements that are distanced and form two planes and a girdle element located between them, and the girdle wheel sticks to the piece of packaging material by means of girdle elements that are distanced and form two planes and a support element located between them, forming the girdle elements and the supporting elements of the wheel and the pusher girdle the neck of packaging material when the mutual approach.

For this it has turned out to be favorable that take place the mutual approximation the elements of girdle form a more or less rhombic form that dwarfs. The girdle elements and supportive elements can additionally present paths recesses more or less semicircular at the bottom of the respective V (of the rhombus), with which forms a neck of packaging material a little or so cylindrical.

So, the girdle elements of the girdle wheel and girdle pusher form paths forms more or less in V, fitting the girdle element of the girdle pusher when the mutual approach takes place between the belt elements of the belt wheel.

The pusher support elements of girdle and girdle elements of the girdle wheel they form up and down two planes between which a exact guidance of the strip when forming the strip around the neck of packaging material and the ends of the Clip are folded exactly and parallel to each other.

The pusher support elements of girdle are also formed to make a move independent of the girdle element. With that, the element of girdle can be removed after girdling, to make room for a "folding clamp" that follows the girdle element which is removed and from two sides and by suitable jaws Applies to the clip around the neck of packaging material and to He then picks it up by tightening on himself and closes it.

The girdle pusher is also adequately provided with cutting equipment (such as a blade) for cutting the clip, whereby when the mutual approximation of the parts of the girdle the clip It is cut and thus separated from the endless material that is provided. However, it is also conceivable to fix two blades in each season of the belt wheel, to cut the clip to take place the mutual approximation.

It has been proven to be favorable take advantage of the belt wheel for the contribution of the clip. This it can be done in particular continuously, for which the clip is provides in the form of continuous clip tape around the wheel of girdle, then being subject to it by use of appropriate means, such as p. ex. by means of the use of vacuum or holding or fixing elements mechanics Through this improvement a constant is achieved clip cut length, which represents a budget essential to match the lengths of the ends of the clip Not in the last place, the present device is distinguished due to the fact that the contribution of the strip is carried out continuously by means of the girdle wheel. Thanks to that the tape Clip can be extracted and positioned in fast cadence. With that failure prone extraction clamps are not necessary, etc.

Since in an embodiment of the The method according to the invention is intended to provide the clip, that is to the clip tape, from a tearing incision, they can also use plastic clip tapes. To be able to open so practicable the packaged product, which closes with a clip of plastic, it is necessary to put an aid to the plastic strip opening in the form of an incision.

The tearing incision application it is preferably carried out by means of the blade, which acts in the clip tape before the girdle of the piece of material packed in the support element.

This is done in a position in the contribution of the clip tape, the advantageously having been chosen here belt wheel station that is opposite the position of closing. However, other positions are also thinkable, and not in last place also even positions located before the wheel of girdle, which achieves however a lower precision regarding the situation of the incision.

The tearing incision for the weakening of the cross section of the clip is practiced conveniently by means of a blade that makes the cut in the clip preferably on the outer side.

The local functional separation according to which different packaging steps are carried out in different positions also allows overlapping a serial packaging of the products, thanks to which you can already start with the packaging of the following products while the ones are still being finished previous products.

The advantages of the invention herein describes, among other things, the fact that they can achieve a higher performance than can be achieved in the case of teams that are hitherto known, as well as in the possibility of using plastic strips as closure material.

Additional features, properties and advantages of the invention follow from the following description of an example based on the drawing, in which:

Fig. 1 shows a plan view schematic of a horizontal section of a girdle a packaging device in the initial position;

Fig. 2 shows a plan view schematic of the belting equipment of Fig. 1 when the girdle Y

Fig. 3 shows a plan view schematic of the belting equipment of Fig. 1 when the clip closure

In the figures a view is represented in schematic plan of a horizontal section of a team of girdle 1 of a packaging device.

To achieve with a view to obtaining a adequate quality level automatic wrapping by fastening with clip closure at a high level of performance, the zones are arranged in locally separated positions functional for the product and piece of material meeting packaging and also for shaping by means of the box folding (collecting), as well as for the application of the clip.

For the sake of simplification, in the case present has been drawn only the girdle equipment 1 Properly said. It is understood however that the device of packaging also presents a folding equipment with a box of folded that are known per se and therefore have not represented, to wrap the product individually in a piece of a packaging material.

With this, you can start packing the next product while packaging is still being finished previous product.

This is solved thanks to the fact that the product to be packed, e.g. ex. leaning on the bottom, it's grabbed and contributed and through a transfer module is rotated 180º being well oriented "head down" with the bottom of the product facing up and is thus positioned under a piece of packaging material Through a piston transfer top-bottom the product to be packed is pushed upwards through a folding box, which produces the folding of the piece of packaging material around the product. This operation corresponds essentially to the known formation of a container formed by folding. On the upper level of the upper-lower piston transfer, the product is then transferred to a composite grill head whose grilling elements then hold the product, and the leftover packaging material is fixed in position by corresponding elements so that they are fixed to the grilling elements.

During this period of time they can take back again to the starting position the upper plunger and the lower plunger. Thanks to this, the product can be taken next by transferring plunger upper-lower, while the spit head transport the partially packaged product to a station subsequent to bring it to the girdle position.

Here the total closure of the container by applying a closure strip or clip. It serves for this purpose the girdling equipment 1 described below, by means of which he gathers on himself by girdle and Close the remaining packaging material with a clip.

The girdle equipment 1 essentially comprises two parts that are mobile to approach each other and that are specifically a belt wheel 2 and a belt pusher 3 that when approaching each other make up or stick the piece of packaging material surrounding product P "above" the product P so as to form the neck H of packaging material, which in turn it is then closed by clip C.

The belt wheel 2 is rotatable around an axis 4 and at the same time is mobile and can make a movement relative to the girdle pusher 3. The wheel of girdle 2 of the present embodiment comprises six 5 gird sites that are taken consecutively to a position in which they coincide with the girdle position by turning around axis 4.

The different gird sites 5 are formed by means of girdle elements 6, 7 that are spaced apart and they form two planes and by means of a support element 8 located between they, being the elements of girdle 6, 7 configured quasi as disks around the central rotation axis 4 of the wheel of girdle 2.

The girdle elements 6, 7 form paths notches that are open in the direction of product P and have little more or less the shape of a "V". In the prolongation of bottom of the "V" is in each case arranged between girdle elements 6, 7 disk-shaped support element 8 block type and of a more or less rectangular shape in section.

The girdle pusher 3 presents by the contrary only a web site 9. This is formed by supporting elements 10, 11 that are spaced apart and form two planes and a girdle element 12 located between them.

The girdle element 12 forms a notch that is open in the direction of product P and has little more or less the shape of a "V". In the extension of the fund of the "V" support elements 10, 11 type are arranged block that have a more or less triangular shape in section. The girdle element 12 is configured such that it is movable thus being able to make a relative movement with regarding the support elements 10, 11.

The girdle pusher 3 comprises additionally a blade 13 which serves to separate by cutting the respective clip C of the clip tape S which is provided continuously. For this, the blade 13 is also configured in such a way which is movable and can thus make a relative movement with with respect to the girdle element 12 and is arranged parallel to the edges and laterally next to the element of girdle 12 and supporting elements 10, 11, respectively.

The girdle elements 6, 7 and 12 and the supporting elements 8 and 10, 11 form by approaching each other the H neck of packaging material, for which they form a shape conical that dwarfs due to the mutual approximation of the V-grooves, whereby the piece of material is fitted leftover packaging (see Fig. 2).

The girdle elements 6, 7, 12 and the supporting elements 10, 11 have slightly more or less recesses less semicircular 14 at the bottom of the respective "V", with which thus forms a slightly more or less cylindrical H neck of packaging material, since the girdle pusher 3 and the belt wheel 2 are mutually approximate only until the point that these recesses 14 form in the direction of the H neck extension of packaging material to form a space continuously cylindrical. So, the neck H of material proper packaging is itself formed by this space cylindrical.

The girdle element 12 fits to have place the mutual approximation between the elements of girdle 6, 7 and presses the packaging material against the support element 8, whereby the packaging material is gradually tight and progressively through the rhombic space that dwarfs, until the packaging material is completely tight and pressed in the cylindrical space to form the neck  H of packaging material.

Then the closure of neck H of packaging material by clip C.

Clip C is separated by cut into a length exactly defined of the clip tape S which is provided in continuous, said cut being made by the blade 13, for which it makes a small relative movement in the direction of the clip tape between the two planes of the girdle elements 6, 7 and is pressed against an additional support element 18 (die cut) and then removed. The additional ones support elements 18 are respectively arranged analogously to the support elements 8 in the intermediate space between the girdle elements 6, 7 and with it between the support elements 8.

The clip tape S is removed in the form of a strip p. ex. of a roll or similar thing and is contributed around the wheel of girdle 2. This is supported between the two planes of the girdle elements 6, 7 in the support elements 8, where holds it by vacuum, tweezers, etc. In the present case empty is used, so that the clip tape S is maintained suction applied to the support elements 8 conveniently configured.

As depicted, the clip tape S, or be the clip C, is in this position before the mutual approach of the belt 2 and the pusher girdle 3, which is automatically applied (or) on one side of the neck H of packaging material that forms later (see Figs. 1 and 2).

To form the neck H of packaging material the girdle element 12 is then removed and it leaves with it clear the way for a folding clamp 15. The neck H of formed packaging material is however fastened or fixed up and down by the support elements 10, 11 and the elements of girdle 6, 7 that still remain there, whereby said neck It keeps its shape.

Thanks to this, the excess material tight packaging is still fixed in the position where you has formed, and prevents the material from reopening packaging, that is the H-shaped neck.

The folding clamp 15 comprises two elements 16, 17 which constitute two jaws and are respectively arranged between the planes of the girdle elements 6, 7 and the supporting elements 10, 11 in the girdle wheel 2. Said elements that constitute jaws are also movable around to axis 4 in the direction of the respective active wrapping site 5 and are arranged in such a way that they are mobile so that they can approach and move away from each other.

Such elements that constitute jaws can be thereby displaced around axis 4 towards neck H of packaging material at the site of active wrapping and for approach each other, to remove the girdle element 12 place clip C cut around neck H of material formed packaging of product P, being by means of a movement thrust of the folding clamp 15 and its elements 16, 17 which jaws constitute the clip C applied around the neck of packaging material in a plane guided by the elements of girdle 6, 7 bordering and by supporting elements 10 and 11. With they also surround the respective support element 8.

When the girdle element 12 has been completely removed, folding clip 15 closes clip C separated by cutting behind the neck H of packaging material by tightening the elements 16, 17 that constitute paths jaws against each other.

In the present case a clip C is used self adhesive p. ex. plastic, with which the product P is already closed. It is also thinkable to use a clip that stays together pressurized with itself by hot melt adhesive, masks cold sealed, etc. The folding clamp 15 is then made conveniently, p. ex. with elements that constitute paths heated jaws.

While clip C is placed around the H neck packing material, the contribution of the clip tape S is on a break. In this pause the movement of the belt wheel 2 a tearing incision is made in the clip tape S as opening aid by means of a moving blade 19. This is done in a position of the contribution of the clip tape S, having been chosen for said position the non-active belt site of the belt wheel 2 which is opposite the closing position. They are however also thinkable other positions, and not lastly also even positions located before the girdle wheel, being without however said incision then practiced more inaccurately regarding the situation of the incision.

The tearing incision for the weakening of the cross section of the strip is practiced by the blade 19, which in the manner and manner that has been represented makes the cut on the outer side during the pause of the contribution of the clip tape S, said blade making a movement in the direction of the belt 2 and being said blade pressed against the corresponding support element 8. The blade 19 is then removed. During the contribution proper of the clip tape S, that is during the rotation of the belt wheel, the blade 19 on the other hand not intervenes.

With this, the tearing incision remains subsequently arranged at a central point in the closed C clip in the neck H of packaging material, and thereby facilitates the clip opening C.

The girdle wheel 2 and the pusher girdle 3 then return to their starting positions in opening state, that is to say they distance each other. With that Product P already fully packaged with clip C is released. Product P already completely packaged and closed with clip C is then removed from the girdle position by means of the grilling head that holds it, and a new product is provided to gird and lock up.

This turns the wheel 2 in around its axis 4, whereby the following web site 5 it is again provided with a piece of the clip tape S.

List of reference signs

one

Girdle equipment

2

Belting Wheel

3

Belt Pusher

4

Axis

5

Girdle site

6

Girdle element

7

Girdle element

8

Support element

9

Girdle site

10

Support element

eleven

Support element

12

Girdle element

13

Knife

14

Recess

fifteen

Folding clamp

16

Element that constitutes a jaw

17

Element that constitutes a jaw

18

Support element

19

Knife

P

Product

C

Clip

S

Clip tape

H

Neck packing material

       \ vskip1.000000 \ baselineskip
    

References cited in the description

This list of references cited by the applicant is provided only as information for the reader and is not part of the European patent document. Although the references were compiled with great care, the possibility of errors or omissions cannot be excluded, and the EPO disclaims any responsibility in this regard .

Patent documents cited in the description

DE 19955667 B4 [0005]

DE 2419072 A1 [0007]

US 1869116 A [0006]

EP 0231939 A1 [0009]

Claims (26)

1. Procedure for packaging a product (P) on a piece of packaging material with wrapping by girdle, in which the tight area of the packaging material that surrounds the product (P) closes with a clip (C), comprising said procedure the following steps:

-

folding (collecting) the piece of material of packaging around the product (P), so that the piece of packaging material surrounds the product (P) leaving a free side;

-

girdle of the piece of material packed on top of the product (P) on the side that has been left free, to form a narrow neck (K) of packaging material; Y

-

closing of the narrow neck of packaging material by application of a clip (C); where

the neck (H) of packaging material is fixed at closing and the clip (C) is provided continuously in the form of endless clip tape (S), where for the tightness for the formation of the narrow neck (H) of packaging material by mutual approximation of the parts (2, 3) the piece of packaging material is collected by tightening on itself so as to form a neck therewith; characterized in that the collection of the piece of packaging material by tightening on itself is carried out by mutual approximation of a girdle pusher (3) and a girdle wheel (2), where the girdle pusher (3) girdle the piece of packaging material by means of supporting elements (10, 11) that are spaced apart and form two planes and a girdle element (12) located between and the girth wheel (2) girdle the piece of packaging material by means of elements of girdle (6, 7) that are spaced apart and form two planes and a support element (8) located in between, and the girdle elements (6, 7, 12) and the support elements (8, 10, 11) form as the neck of packaging material approaches each other. 2. The method according to claim 1, characterized in that the girdle pusher (3) and the girth wheel (2) are made to make a relative movement by virtue of which they approach each other. 3. Method according to one of the preceding claims, characterized in that the neck (H) of packaging material is fixed above and below the closing site upon closing. Method according to claim 1, characterized in that when the mutual approximation takes place the girdle elements (6, 7, 12) form a rhombic shape that dwarfs. 5. Method according to claim 1 or 4, characterized in that the girdle elements (6, 7, 12) and the support elements (10, 11) have slightly more or less semicircular recesses (14) in the bottom of the respective V, whereby a neck (H) of packing material is formed more or less cylindrical. Method according to one of the claims 1 to 5, characterized in that when the mutual approach takes place, the girdle element (12) fits between the girdle elements (6, 7). Method according to one of the preceding claims, characterized in that the clip (C) or respectively the clip tape (S) is made in particular of plastic. Method according to one of the claims 1 to 7, characterized in that the clip (C) or respectively the clip tape (S) is guided (a) between the two belting elements (6, 7) spaced apart. and the two supporting elements (10, 11) distanced. Method according to one of claims 1 to 8, characterized in that, before the wrapping of the piece of packaging material, the clip (C) is applied to the support element (8), being in particular fixed by means of subjection. Method according to one of claims 1 to 9, characterized in that, when the girdle element (12) is removed, the support elements (10, 11) of the girdle pusher (3) remain in place, with which fixes the narrow neck (H) of packaging material. Method according to one of the claims 1 to 10, characterized in that at the same time that the fastening element (12) is removed, the clip (C) is closed, in particular by means of a folding movement by pushing. 12. Method according to one of the preceding claims, characterized in that a tearing incision is made to the clip (C) or respectively to the clip tape (S). 13. Method according to claim 12, characterized in that the tearing incision is made by means of a movable knife (19), in particular on the outer side of the clip tape (S). 14. Method according to claim 12 or 13, characterized in that the blade (19) acts on the clip tape (S) in the support element (8) before the wrapping of the piece of packaging material. 15. Method according to one of the preceding claims, characterized in that the folding (the collection) and the wrapping of the piece of packaging material are carried out in locally separated sites. 16. Device for packaging a product (P) in a piece of a wrapping material with wrapping, where the tight area of the packaging material surrounding the product is closed with a clip (C), with a box of folding, to make a folding of the piece of packaging material around the product (P), so that the piece of packaging material surrounds the product (P) leaving one side free, with a wrapping equipment (1), to make a wrap of the piece of packaging material on top of the product (P) on the side that is left free, so as to form a narrow neck (H) of packaging material, and with means (2, 3) for closing of the narrow neck (H) of packaging material by applying a clip (C), elements (6, 7, 10, 11) being provided for fixing the neck (H) of packaging material upon closure and means for the continuous supply of the clip (C) in the form of an endless clip tape (S); characterized by the fact that the girdle equipment (1) has a girdle pusher (3) and a girdle wheel (2) that are configured to be able to carry out a relative movement of mutual approach, presenting the girdle pusher (3) supporting elements (10, 11) that are spaced apart and form two planes and said girdle pusher presenting a girdle element (12) located in between, and presenting the girth wheel (2) girdle elements (6, 7) that are distanced and form two planes and a support element (8) located in between. 17. Device according to claim 16, characterized in that the wrapping elements (6, 7, 12) form V-shaped paths. 18. Device according to claim 16 or 17, characterized in that the girdle elements (6, 7, 12) and the support elements (10, 11) have slightly more or less semicircular recesses at the bottom of the V. 19. Device according to one of claims 16 to 18, characterized in that the support elements (10, 11) of the girdle pusher (3) are configured to be able to make an independent movement of the girdle element (12). 20. Device according to one of claims 16 to 19, characterized in that the support elements (8) of the wrapping wheel (2) are configured to provide the clip (C). 21. Device according to one of claims 16 to 20, characterized in that the girdle pusher (3) has a cutting device (13) for cutting off the clip (C). 22. Device according to any one of claims 16 to 21, characterized in that the folding box for folding and the wrapping equipment (1) for wrapping the piece of packaging material are arranged in locally separated places. 23. Device according to one of claims 16 to 22, characterized in that a folding clip (15) is provided for closing the clip (C), which has two elements (16, 17) that constitute two jaws. 24. Device according to one of claims 16 to 23, characterized in that a unit, which is in particular a blade (19), is provided for making a tearing incision to the clip (C) or the clip tape ( S), respectively. 25. Device according to claim 24, characterized in that the blade (19) is oriented and arranged to make the tearing incision on the outer side of the clip tape (S). 26. Device according to claim 24 or 25, characterized in that the blade (19) is made such that it is movable and can be set in motion by means of movement that cause the blade (19) to make a movement in direction to the belt wheel (2).