DE102010051721A1 - Device and method for attaching bags - Google Patents

Abstract

Attachment device and method for attaching valve sacks to a filler neck of a packing machine with at least one gripping device and at least one attachment device to grip a valve sack and transfer it to the attachment device in an at least partially hanging position for attachment. At least one alignment device is provided in order to ensure a defined vertical alignment of the bag to be attached.

Description

The invention relates to a device and a method for attaching bags and in particular for attaching valve bags to the filler neck of a particular rotating packing machine.

In the prior art, various devices and methods for attaching valve bags to the filler neck of rotary packing machines have become known. Rotary packaging machines with 4, 6, 8, 10, 12 or even 16 or any other number of filler neck have become known in the art. They are used to effectively fill a wide variety of materials. For example, bulk materials such as cement are often filled by rotating packaging machines. Modern packaging machines allow high filling rates, in which, for example, one bag or more is filled per second.

For automatic operation of such a packing system, the valve bags are plugged by a slip-on the filler neck of the packing machine during the rotational movement or shot. The term "shot" is correct insofar as the sacks have to bridge a short distance unguided the space between the slip-on and the filler neck of the packing machine.

In order to achieve a high Aufsteckquote, the bags must be picked up defined and shot from a defined position on the filler neck of the packing machine.

With the high attachment rates of modern packaging machines, for example, 3600 bags per hour, one bag per second is plugged. For example, if only one percent of the valve bags are not plugged onto a filler neck because the positioning of the valve bag prior to insertion was inaccurate, 36 valve sacks accumulate on the floor after one hour, which would add up to 360 valve sacks in 10 hours of operation, unless the bags are collected. Such collection is therefore necessary at periodic intervals so as not to interfere with the function. It is therefore important to increase the slip rate since, for example, increasing the slip rate by only 0.1% from 99.5% to 99.6% results in a significant relative reduction in incorrectly plugged valve bags of 20% in this example.

Often, such valve bags are made of paper or have an outer or inner layer of paper, which leads to a certain rigidity of the valve bags. Valve bags made of such a relatively stiff material allow a relatively simple, yet relatively accurate positioning, since the individual valve bags and also the entire bag bundle can be easily aligned in the longitudinal and transverse directions via slides, grippers or the like.

Often, however, valve bags made of more flexible materials are used, which consist for example of a fabric or a ribbon fabric made of plastic materials. Also, valve bags made of film often have greater flexibility. Such valve bags are usually attached by hand.

In particular, valve bags made of fabric or ribbon fabric are inexpensive to manufacture and have a relatively high load capacity. For automatic filling and Aufstecksysteme they are, however, unfavorable, since due to the flexibility of the valve bags, an accurate and reproducible positioning is difficult. Both the alignment of the individual valve bag and the alignment of a bag bundle are more difficult.

If valve sacks are picked up with a not exactly defined position and shot in the direction of the filler neck of the packaging machine, then the attachment rate depends strongly on the respective and random position of the bag valve.

It is therefore the object of the present invention to provide a device and a method for attaching bags and in particular for attaching valve bags available, thus allowing a higher reproducibility and thus a higher Aufsteckquote also in the processing of flexible bags.

This object is achieved by a device having the features of claim 1 and by a method having the features of claim 17. Preferred developments of the invention are subject of the dependent claims. Further advantages and features of the present invention will become apparent from the embodiments.

The device according to the invention is used for attaching bags and in particular for attaching valve bags to a filler neck of a packing machine. The slip-on device comprises at least one gripping device and at least one attachment device in order to grip a sack and to transfer it to the slip-on device in an at least partially hanging position for attachment. At least one alignment device is provided to ensure a defined vertical orientation of the bag to be staked.

The slip-on device according to the invention has many advantages, since a defined orientation of the bag in the vertical direction is possible and guaranteed. Due to the defined orientation of the bag to be placed on a significantly higher Aufsteckquote can be achieved, even if bags made of a flexible material are used. For example, it is possible to shoot uncoated sacks of a plastic fabric with high reliability on the filler neck of a packing machine.

In a preferred embodiment, a storage table for receiving a flat bag bundle is provided. Particularly preferably, the topmost bag is received by the bag bundle on the delivery table and plugged by the slip-on on the designated filling of a packing machine.

Before the bag is picked up from the sack bundle on the delivery table, a particularly defined (horizontal) alignment of the sack can take place so that the sack is picked up by the gripping device in a targeted manner.

In the following, the bag is transferred from the gripping device of the slip-on device, wherein the gripping device must release the valve bag. This can lead to an uncontrolled movement of the bag. Therefore, the inventively provided vertical alignment device defines the bag defined, so that a defined further treatment of the valve bag is possible. For this purpose, the alignment device preferably has at least one blowing device, wherein the blowing device in particular comprises at least one air nozzle.

It is possible that a combined gripping device and slip-on device is provided, in which such a combined device takes the bag from the stack and attaches.

The blower preferably emits an at least partially upwardly directed air blast for defined orientation. The air blast can be oriented virtually vertically upwards, but can also be aligned obliquely. The air blast can be short-term or permanent.

In a preferred embodiment, the alignment device aligns the bag against a contact device with an upper stop. It is also possible that the alignment device aligns the bag against a V-shaped upper stop a conditioning device. The V-shaped upper stop forms an upper limit of the investment device. Such particular acute-angled attacks are particularly suitable because it is achieved in two dimensions, a defined position of the bag end.

For transferring the bag to be attached from the position on the delivery table in the at least partially suspended position, the gripping device can perform a parallelogram-like movement or a pivoting movement. An advantage of a pivoting movement, for example, 90 degrees, is that the bag to be attached is transferred directly from the lying position on the tray table in a hanging position.

The investment device may be provided pivotable.

Preferably, at least one alignment device is associated with the gripping device. The alignment device can be arranged on the gripping device or else be provided in its vicinity. In such a configuration, the alignment device can output a targeted air blast or air flow when the gripping device releases the bag, so that a targeted alignment of the bag takes place by the air blast.

In all embodiments, the slip-on device preferably has an acceleration device. The accelerator may include, for example, a roller bar and a drive belt for receiving the bag between the roller bar and the drive belt and accelerating it by activating the drive belt in the direction of the filler neck.

It is also possible that an alignment device is assigned to the acceleration device. For example, the gripping device can deliver the bag to the accelerating device and the bag can be moved by the accelerating device into the region of the gripping device. An alignment in the vertical direction has not yet taken place. In such embodiments, it is possible that an alignment device is provided at or in the vicinity of the acceleration device, which outputs a targeted air blast on the bag, while the accelerator device releases the bag short term. For example, the roller bar and the drive belt of the accelerator may be pivoted or moved relative to each other to allow a defined gap between the roller bar and the drive belt. This can be used so that the alignment device definitely aligns the sack to be opened in the vertical direction.

In all embodiments, it is also possible that the acceleration device two Belt drives or two driven roller rails or other acceleration components includes.

Preferably, the Aufsteckeinrichtung comprises two Aufsteckteile, of which at least one is pivotally provided.

In particular, the plug-on device comprises a valve opening channel or a firing channel, which may consist of two channel parts which are each connected to one of the plug-on parts. Preferably, the roller bar is provided on one of the plug-on parts and the belt drive on the other plug-on part, so that when the plug-on parts are pivoted, the firing channel is opened and the belt drive is removed from the roller strip or vice versa.

The invention is also directed to a packaging line having at least one clip-on device as described above. In particular, the packing installation may comprise one or more packaging machines.

The inventive method is used for attaching valve bags to a filler neck of a packaging machine, in which a gripping device takes an empty valve bag and in which the slip-on the empty valve bag attaches to a filler neck. In this case, the bag received by the gripping device is transferred to an at least partially suspended position and then aligned vertically before the bag is attached to the Aufsteckeinrichtung on the filler neck.

The method can be used on rotating packaging machines or on stationary packaging machines, which have one or more filling nozzles.

In the device according to the invention and in the method according to the invention, the orientation in the vertical direction can be perpendicular to the top, but the alignment can also be made obliquely upward, since in such an inclined orientation also takes place in the vertical direction. It is also possible that a sack end is aligned in the horizontal direction and then the horizontal orientation is converted into a vertical orientation.

Preferably, the bag is aligned via a blowing device in the vertical direction. Particularly preferably, the gripping device releases the bag before the bag is aligned vertically with the blowing device.

Preferably, the bag is detected by an accelerator, after the bag has been aligned vertically defined.

For targeted alignment of a contact device can be pivoted to the gripped by the gripping bag. Such a system may also include the stop for the defined positioning of the bag.

In all embodiments, it is preferred that the movements of the gripping device, the accelerator device and the abutment device are coupled.

Further advantages and features of the present invention will become apparent from the embodiments, which are explained below with reference to the accompanying figures.

Show:

1 a schematic plan view of a packing plant with a packing machine and a device for attaching valve bags;

2 an overall view of the device according to the invention for attaching valve bags;

3 an enlarged detail view of the receiving device for receiving the valve bags;

4 the receiving device after 3 after gripping a valve sack;

5 the receiving device after 3 before a vertical orientation of the valve bag;

6 the receiving device after 3 after the vertical alignment of the valve bag;

7 an alternative embodiment of a receiving device;

8th the receiving device after 7 grabbing a bag;

9 the receiving device after 7 before the vertical orientation of the valve bag;

10 the receiving device after 7 with vertically aligned valve bag;

11 a valve bag in the valve opening channel of the slip-on prior to shooting;

12 a cross section through 11 at the height of the air nozzles;

13 the valve opening channel with the slip-on device just before the valve sacking;

14 a cross section through the valve opening channel at the height of the air nozzles; and

15 a plan view of a flat-lying valve bag and a cross section of the Sackumschlagendes.

With reference to the enclosed 1 - 15 In the following, some embodiments of a device according to the invention will be explained.

1 shows a highly schematic plan view of a packing plant 60 holding a rotating packing machine 1 and a slip-on device 10 as well as a discharge belt 70 includes.

The packing machine 1 is used to fill valve bags 2 and has in the illustrated embodiment, six distributed over the circumference arranged filler neck 3 on, of which five fillers 3 each valve sacks 2 are arranged.

The packing machine 1 is in the plug-on position. The angle sensor 61 had previously the Vorbeirotieren the next filler 3 in the predetermined angular position 46 recorded and thus triggered the next Aufsteckvorgang. In addition to using one of the slip-on device 10 associated sensor is also the use of an existing in the packing machine sensor possible, the predetermined angular position 46 detected.

The slip-on device 10 has a empty bag magazine here 71 and a slip-on device 20 , 2 shows in a perspective overall view of the slip-on device 10 , The empty bag magazine can be designed as empty bag cell magazine and for the automatic transport of bag bundles 5 the receiving device 30 the slip-on device 10 be suitable.

In the illustration after 2 becomes a bag-bundle 5 straight towards the as a storage table 34 trained storage facility 42 transported. The storage table 34 has a shelf space 58 on which a bag-bundle 5 can be stored. Following this, the top valve bag 2 of the sack bundle 5 from the receiving device 30 grabbed and the slip-on device 20 fed. It is also possible that the bags are pre-separated and individually on the storage device 42 or the storage table 34 be arranged and taken there.

The slip-on device 10 can also be retrofitted to existing packing machines.

The packing machine 1 is particularly suitable for filling powdery or granular substances in valve sacks 2 , The bag weight of the individual bags may vary and is in particular between about 5 and 50 kg, and preferably between 20 and 50 kg, but may also be larger or smaller depending on the application.

In 3 is an enlarged schematic representation of the receiving device 30 represented, with the defined receiving the valve bags 2 takes place, even if the valve bags are not made of a relatively rigid material, but of a flexible plastic material such as a fabric.

On the storage table 34 is a bag bundle 5 from several valve bags 2 arranged, for better understanding here, the individual valve bags 2 Placed offset in the longitudinal direction are located. This can also occur in practice, especially in the case of flexible bags, since sacks of flexible material can not be aligned as easily as is the case, for example, with bags made of paper.

The recording device 30 has a gripping device 4 , here a suction pad with several suckers arranged one behind the other 59 includes. The individual suckers 59 can be selectively switched on or off depending on the width of the valve bags to be processed and / or are arranged adjustable.

The recording device 30 furthermore has a positioning device 50 here a blower 51 includes one or more air jets 53 having. The air nozzle 53 may in principle have any cross-section and in particular as a flat nozzle 54 be executed and extend over the depth of the bag. The positioning device 50 effected with the blowing device 51 aligning the topmost bag with the stopper 52 of the filing table 34 , Through a targeted air blast of the air nozzles 53 the blowing device 51 the sack is directed towards the stop 52 moves and gets to the bag stop end 48 defined at the stop 52 brought. The other end 49 of the bag is adjusted accordingly. Even previously isolated sacks can be aligned accordingly.

4 shows a further enlarged view of the receiving device 30 in the recording position. Additionally marked is an arrow from the air nozzle 53 towards the sack end 48 to the sack at the stop 52 align. Of the drawn arrow indicates the airflow. The air flow can attack at the protruding end behind the sack seam or it engages a tab 55 which forms, for example, by folding over the bag end when the bag valve 8th on the valve bag 2 is formed. It turns out that a certain area protrudes tab-like, here to transport the valve bag 2 on the stop 52 is used. By a puff of air raises the tab 55 with the free end from the surface of the valve bag 2 and thus allows a particularly effective transport to the stop 52 ,

Also box valve bags can be aligned accordingly. The air flow can attack there under the folded bag bottom. It is also possible to attach a bag or the like on the side wall to align bags.

As in 4 clearly recognizable, is the topmost valve bag to be accommodated 2 with his end 48 at the stop 52 although the underlying valve bags 2 of the sack bundle 5 are not perfectly aligned.

After being in the position of 4 the gripping device 4 with the suction strip and the suckers 59 the end 48 of the valve bag 2 next to the tab 55 has grasped, in this embodiment, the gripping device 4 pivoted upwards by 90 degrees, being the end of the bag 48 upwards and in the direction of the second sack end 49 is spent. The second end 49 the bag can be on the bag bundle 5 remain or it is raised by suitable further sucker to prevent accidental snagging with the underlying valve bags 2 to prevent. This position is in 5 shown.

After the pivoting of the gripping device 4 becomes the investment facility 40 with the roller bar 35 down, with a small gap between the roller bar 35 and the drive belt 36 remains, so that the valve bag 2 is still movable in the vertical direction.

Subsequently, the valve bag 2 aligned in the vertical direction. This is an alignment 32 used, which has a blowing device 39 and the investment facility 40 features. The investment facility 40 lies on the sucker 59 opposite side of the valve bag 2 at. Following this, the vacuum of the nipple 59 shut off while at the same time a puff of air through the blowing device 39 that with air nozzles 41 equipped, is activated. The air flow of the blowing device 39 is oriented vertically upwards or substantially upwards to under the tab 55 of the valve bag 2 to grab and sack the whole of the 5 shown hanging position 37 in the 6 illustrated aligned position 38 to convict.

The valve bag 2 is through the blowing device 39 raised vertically until it passes through the V-shaped top stop 44 is limited in its further movement upwards. In this construction, the bag is in the aligned position 38 defined so that a defined plugging is possible.

In 7 is another embodiment of a slip-on device 20 for use on a clip-on device 10 shown schematically. The slip-on device 20 also has a gripping device 4 that with a suction pad with several suckers 59 equipped. In contrast to the clip-on after 5 and 6 is here in the embodiment of the 7 and 8th the gripping device 4 not provided pivotable, but provided over a parallelogram-like structure movable.

8th shows the gripping device 4 when gripping a valve sack 2 from the bag bundle 5 by means of the suckers 59 , It has surprisingly been found that the suckers 59 Also for use in basically air-permeable textile bags from a fabric or a ribbon fabric find sufficient support, so that a reliable gripping and lifting with the gripping device 4 is possible.

In 8th is the role bar 35 with the investment facility 40 folded away, so that the gripping device 4 with the gripped valve bag 2 from the in 8th position shown in the in 9 shown position can be transferred, in which the valve bag 2 in the hanging position or partially hanging position 37 is arranged.

The fact that the gripper performs a parallelogram-like movement, that is with the sucker 59 taken end 48 aligned parallel to the bag bundle approximately horizontally, while the remaining valve bag 2 hangs down. In the in 9 position shown is the roller bar 35 still a little bit of the drive belt 36 spaced to allow free vertical movement of the valve bag 2 to enable.

The alignment device 32 here includes a blowing device 39 and the investment facility 40 ,

After reaching the in 9 shown position, the suction vacuum is turned off and by means of the blowing device 39 Air obliquely upward in the direction of the V-shaped stop 44 blown so that the valve bag from the in 9 position shown in the in 10 illustrated aligned position 38 is transferred. The drawn arrow indicates the flow of air under the flap 55 of the valve bag 2 grips and holds the sack reliably in the V-shaped stop 44 positioned.

In the background is the valve opening channel 31 to recognize where the valve bag 2 with the as acceleration device 6 trained bag feeder 62 accelerated and finally on a filler neck 3 a packing machine 1 is shot up. The valve opening channel 31 is as a shot channel 7 trained and used to shoot up the valve bags 2 on the filler neck 3 , In other embodiments, it is also possible, the valve bags 2 with the bag feeder 62 directly to the filler neck 3 attach.

After the valve bag 2 at the V-shaped stop 44 has been positioned, the roller bar moves 35 close to the drive 36 so that the valve bag 2 firmly held in between and in the longitudinal direction of the firing channel 7 is drivable.

When the movement starts, the one with its upper end will be 48 obliquely upward valve bag 2 with the deflection device 28 transferred from the oblique to a vertical position. Nothing changes that the bag is kept well defined.

Following this, the bag feed device 62 or acceleration device 6 remain activated until, for example, the front end of the bag falls within the detection range of the in 12 represented sensor 21 arrives. In this bag position 22 a complete stop of the valve bag occurs 2 until the signal for shooting up the valve bag 2 is given.

11 shows a front view into the valve opening channel 31 in, being below the valve opening channel 31 the drive belt 36 and the roll bar 35 are shown, between which the valve bag 2 recorded and accelerated.

The valve opening channel 31 or shot channel 7 consists of two channel parts 25 and 26 that the slip-on parts 23 and 24 the slip-on device 20 assigned.

The shape of the cross section 27 is diamond-shaped here, but may also be polygonal, oval or round.

In the background is the investment facility 40 with the V-shaped top stop 44 and the deflection 28 visible, noticeable.

The valve bag 2 is in the hanging position 29 in which it is aligned in the vertical direction exactly. The hanging position 29 can be the aligned position 38 correspond.

In the valve opening channel 31 or shot channel 7 is a blowing device 9 provided here two air jets 11 and 12 includes. The air nozzles 11 and 12 are on both sides 14 and 15 the valve opening channel 31 provided so that they are on both sides of the valve 8th of the valve bag 2 are arranged. The air nozzles 11 and 12 are designed to air in the direction of the outlet opening 13 the firing channel 7 to blow. The position of the air nozzles 11 and 12 can be adapted to the present conditions. The exact beam direction can be adjustable. A beam direction slightly outward has brought positive results.

The air nozzles 11 and 12 are here at Strömungsleiteinrichtungen 17 and 18 arranged, which lead to a cross-sectional constriction of the flow channel. The flow guides 17 and 18 are here each as a built-in part 19 executed, but can also be an integral part of the valve opening channel 31 or shot channel 7 be.

The flow guides 17 and 18 are in the area in front of the air nozzles 11 and 12 aerodynamically designed, so that in the flow through the valve opening channel 31 the vortex formation is reduced.

The air nozzles 11 and 12 each blow a stream of air 16 as shown by the arrows in 12 is indicated.

The through the flow guides 17 and 18 There caused cross-sectional constriction leads there to an increase in the flow velocity and thus in the lateral areas to a negative pressure, which leads to an opening of the bag valve 8th leads.

The signal to plug in is a short time before the activation of the accelerator 6 given. Between 0.05 and about 1 second before activating the accelerator and actual valve boot 2 becomes the airflow 16 the air nozzles 11 and 12 turned on and can build an approximately stationary flow profile, which is already an opening of the bag valve 8th leads. After the airflow 16 was activated for preferably 0.2 to 0.5 seconds, the drive belt is switched to maximum intended power to the valve bag 2 to accelerate and on the filler neck 3 a packing machine 1 aufzuschießen.

Depending on the desired capacity of the packing machine 1 and the acceleration capability of the accelerator 6 can Of course, only be accelerated with a partial performance.

14 shows a cross section in the height of the air nozzles 11 and 12 the condition of the valve bag 2 when leaving the firing channel 7 , The bag valve 8th is sufficiently open and can be placed on the filler neck 3 the packing machine 1 be plugged or shot.

15 shows a valve bag 2 in a highly schematic plan view and in a schematic side view of the bag end 48 ,

The valve bag 2 consists here of ribbon fabric 57 which is permeable to air. The valve bag 2 points to the end 48 the bag valve 8th on, which by folding and folding several times of the bag end or the end portion 56 originated. This conditionally results in a tab 55 at the end 48 the bag, which is about 0.5 to 4 cm long and provides sufficient flow resistance when under the tab 55 a stream of air is blown to the valve bag 2 to align laterally or vertically.

Overall, the invention provides an advantageous device and an advantageous method, which also valve bags 2 Made of flexible materials with high speed and reliable on the filler neck 3 can be plugged by rotating or stationary packing machines. In this case, a reliable alignment of the valve bags 2 on the storage table 34 to a defined receiving the valve bags 2 to ensure. Furthermore, the valve bags 2 aligned in the vertical direction repeatable and it is done by the air flow in the valve opening channel 31 a reliable opening of the bag valves 8th the valve bags 2 ,

For the purposes of the present invention, the term "air" is understood to mean not only air but also any other gas or gas mixture. The term "air nozzle" basically includes any gas outlet elements and gas outlet surfaces. Are possible round, square, oval, rounded, flat and other cross-sectional shapes on the gas outlet surface. It is also possible, for example, that a pipe or hose is used as a gas outlet. The design does not have to be nozzle-shaped in the narrower sense. Also, an end of a pipe or hose without cross-sectional change is considered as an air nozzle in the context of the present invention.

LIST OF REFERENCE NUMBERS

1

packing machine

2

valve bag

3

filling

4

gripper

5

sack bundle

6

accelerator

7

firing channel

8th

Valve

9

blower

10

slip-on device

11

air nozzle

12

air nozzle

13

outlet opening

14

page

15

page

16

airflow

17

flow guide

18

flow guide

19

fitting

20

Aufsteckeinrichtung

21

sensor

22

sack position

23

An attachment

24

An attachment

25

channel part

26

channel part

27

cross-section

28

deflecting

29

hanging position

30

recording device

31

Valve opening channel

32

aligning

34

tray table

35

roller strip

36

drive belts

37

hanging position

38

aligned position

39

blower

40

equipment installation

41

air nozzle

42

Bin Setup

43

upper stop

44

V-shaped upper stop

46

predetermined angular position

47

eccentric

48

The End

49

The End

50

positioning

51

blower

52

attack

53

air nozzle

54

flat die

55

flap

56

end

57

woven fabric

58

shelf

59

sucker

60

Pack system

61

angle sensor

62

Sack feeder

70

Austrageband

71

Empty bag magazine

Claims (22)

Clip-on device ( 10 ) for attaching bags ( 2 ), in particular for attaching valve bags ( 2 ) on a filler neck ( 3 ) a packing machine ( 1 ), with at least one gripping device ( 4 ) and at least one slip-on device ( 20 ) to a bag ( 2 ) and the slip-on device ( 20 ) in an at least partially suspended position ( 37 ) for putting on, characterized in that at least one alignment device ( 32 ) is provided to a defined vertical orientation ( 38 ) of the bag to be put on ( 2 ) to ensure. Clip-on device ( 10 ) according to claim 1, wherein a storage table ( 34 ) for receiving a flat lying bag bundle ( 5 ) is provided. Clip-on device ( 10 ) according to claim 2, wherein the alignment device ( 32 ) at least one blowing device ( 39 ), wherein the blowing device ( 39 ), in particular at least one air nozzle ( 41 ). Clip-on device ( 10 ) according to at least one of the preceding claims, wherein at least one blowing device ( 39 ) emits an at least partially upwardly directed puff of air. Clip-on device ( 10 ) according to at least one of the preceding claims, wherein the alignment device ( 32 ) the bag ( 2 ) against an investment facility ( 40 ) with an upper stop ( 43 ). Clip-on device ( 10 ) according to at least one of the preceding claims, wherein the gripping device ( 4 ) performs a parallelogram-like motion. Clip-on device ( 10 ) according to at least one of the preceding claims, wherein a deflection device ( 28 ) is provided, with which the bag ( 2 ) from a partially suspended position ( 37 ) or an aligned position ( 38 ) in a suspended position ( 29 ) is transferred. Clip-on device ( 10 ) according to at least one of the preceding claims, wherein an investment device ( 40 ) for the received bag ( 2 ) provided with an upper boundary a V-shaped upper stop ( 44 ). Clip-on device ( 10 ) according to at least one of the preceding claims, wherein the investment device ( 40 ) Is provided pivotably. Clip-on device ( 10 ) according to at least one of the preceding claims, wherein the gripping device ( 4 ) Is provided pivotably. Clip-on device ( 10 ) according to at least one of the preceding claims, wherein at least one alignment device ( 32 ) of the gripping device ( 4 ) assigned. Clip-on device ( 10 ) according to at least one of the preceding claims, wherein the slip-on device ( 20 ) at least one accelerator ( 6 ). Clip-on device ( 10 ) according to the preceding claim, wherein at least one alignment device ( 32 ) of the accelerator ( 6 ) assigned. Clip-on device ( 10 ) according to at least one of the preceding claims, wherein the acceleration device ( 6 ) at least one roll bar ( 35 ) and a belt drive ( 36 ). Clip-on device (10) according to at least one of the preceding claims, wherein the plug-on device ( 20 ) two attachment parts ( 23 . 24 ), at least one of which is provided pivotably. Packing plant ( 60 ) with at least one slip-on device ( 10 ) according to at least one of the preceding claims. Method for attaching valve bags ( 2 ) on a filler neck ( 3 ) a packing machine ( 1 ), in which a gripping device ( 4 ) an empty valve bag ( 2 ) and in which a slip-on device ( 20 ) the empty valve bag ( 2 ) on a filler neck ( 3 ), characterized in that the gripping device ( 4 ) received bag ( 2 ) in an at least partially suspended position ( 37 ) and then aligned vertically before the bag ( 2 ) with the slip-on device ( 20 ) on the filler neck ( 3 ) is plugged. Method according to the preceding claim, wherein the bag ( 2 ) via a blowing device ( 39 ) is aligned vertically. Method according to one of the two preceding claims, wherein the gripping device ( 4 ) the bag ( 2 ) and the bag ( 2 ) then with the blowing device ( 39 ) is aligned vertically. Method according to one of the three preceding claims, wherein the bag ( 2 ) by an accelerator ( 6 ) is detected after the bag ( 2 ) was aligned vertically defined. Method according to one of the three preceding claims, wherein an investment device ( 40 ) to that of the gripping device ( 4 ) gripped bag ( 2 ) is pivoted. Method according to one of the four preceding claims, wherein the movements of the gripping device ( 4 ), the accelerator ( 6 ) and the investment facility ( 40 ) Coupled.

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