DE102016125485A1 - Clip-on device and method for attaching valve bags - Google Patents

Abstract

Attachment device (1) for attaching woven and / or sewn valve sacks (10) to a filler neck (101) of a packing machine (100), having a gripper holder (4) movable between a receiving position (2) and an alignment position (3) Gripper (5) for gripping a valve bag (10) in the receiving position (2) and having a blowing device (6) with an air nozzle (7) for aligning the valve bag (10) in the alignment position (3). Between the gripper holder (4) and the blowing device (6), a receiving space (20) for a sack portion (10) of the valve sack (2) is formed in the alignment position (3). The gripper (5) is from a first side (21) and the air nozzle (7) is aligned from an opposite second side (22) on the receiving space (20) to on opposite side walls (11, 12) of a in the receiving space ( 20) accommodated valve bag (10) act.

Description

The present invention relates to a slip-on device for attaching valve bags and in particular for attaching woven and / or sewn valve bags to a 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. 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.

When filling such bulk materials in valve sacks made of paper can be reliably worked with a high Aufsteckrate, as valve sacks made of paper have a certain inherent rigidity.

However, if valve bags made of more flexible materials are used, which for example consist of a fabric or a ribbon fabric made of plastic materials, these valve sacks have greater flexibility, which causes considerable difficulties in automatic Aufsteckung.

It is therefore with the EP 2 455 288 B1 a device and a method has become known, which valve bags made of fabric or ribbon fabric are shot onto the rotating filler neck of a packaging machine. The known device uses a tab-like area that protrudes from the bag surface to blow a targeted air blast below, with which the valve bag is positioned defined at an upper stop.

The known device works reliably and allows high Aufsteckraten and high Aufsteckquoten, provided that a sufficient tab is formed on the valve bag on which the air blast can attack. In flexible valve bags, in which no or a very weak tab protrudes from the surface of the bag, it has been found that a reliable Aufsteckung works only at relatively low speeds or Aufsteckraten. At low speeds, however, such a slip-on device does not work economically.

It is therefore the object of the present invention to provide a slip-on device and a method for attaching valve sacks to a filler neck of a packing machine, which means that even with flexible valve sacks without sufficiently protruding straps, a high slip-on rate with high slip-on distance can be achieved.

This object is achieved by a slip-on device with the features of claim 1 and by the method with 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 general description and the description of the embodiment.

An attachment device according to the invention is used for attaching valve bags and in particular for attaching woven and / or sewn (flexible) valve bags to a filler neck of a packaging machine. The clip-on device comprises a gripper holder movable between a pick-up position and an alignment position with at least one gripper for gripping a valve bag in the pick-up position. The slip-on device further comprises a blowing device with at least one air nozzle to align the valve bag in the alignment position (defined). Between the gripper holder and the blowing device, a receiving space for a sack portion of the valve sack is formed at least in the alignment position. The gripper is in the alignment position from a first side and the air nozzle is aligned in the alignment position from an opposite second side to the receiving space to act on opposite side walls of a valve bag received in the receiving space.

The slip-on device according to the invention has many advantages. A significant advantage of the slip-on device according to the invention is that the blowing device with the air nozzle or the air nozzles from a side opposite the grippers side acts on the valve bag to be aligned. As a result, an air cushion is formed on the opposite side of the gripper, by which any friction between the valve bag and any walls is reduced. Typically, the valve bag with the gripper is of one (eg lying horizontally on a table) Sack stack taken and spent in a raised position. If air is directed in the direction of the valve sack only from the side opposite the gripper, the valve sack can slide on an air cushion and be aligned. In this case, the valve bag by the often very rough surface of woven and / or sewn valve bags by the directed air flow can also be transported (at least partially) in the vertical direction to be aligned.

In the alignment position, a receiving space for a sack portion of the valve sack is formed between the gripper holder and the blowing device, the gripper acting on a first side wall and in particular an upper side wall and the air nozzle on an opposite second and in particular lower side wall of the valve sack. Previously, the gripper has received in the receiving position, the uppermost valve bag of a bag stack on a receiving table or get passed over another gripper for example. The gripper can seize the valve bag, in particular in the valve region.

In a preferred embodiment, a contact device is provided with an upper stop. The upper stop limits the receiving space upwards. At the upper stop a valve bag is defined aligned. Preferably, the upper stop is V-shaped. In particular, an acute-angled region is formed on the V-shaped stop. As a result, a defined positioning of a valve bag is ensured at the top stop. In preferred embodiments, the abutment means comprises an angle plate. At the angle plate, the upper stop may be formed. The upper stop can be formed by the angle plate. The angle plate is designed in particular V-shaped and is open to the receiving space, so that a defined orientation of a valve bag and in particular of the valve area is made possible at the top stop.

Preferably, the gripper holder is coupled to the blowing device. It is particularly preferred that the gripper holder is movable relative to the blowing device. Preferably, the gripper holder and the blowing device are pivotally coupled together. In this case, an opposite pivoting is possible, which leads depending on the pivoting direction to an enlargement or reduction of the receiving space.

In advantageous developments, air openings are formed on the contact device and in particular on the angle plate. Particularly preferably, some air openings are formed in the corner or in the vicinity of the corner or in the acute-angled area of the upper stop. The air openings allow air to escape from the receiving space through the air openings into the environment. Thereby, a discharge of the air flow from the air nozzles and thus a directed flow without congestion is made possible, whereby a positioning of the valve bag is facilitated.

Preferably, the gripper holder is pivotally received on a gripper holder coupling. In this case, the gripper holder coupling is movable to transfer the gripper holder from the receiving position to the alignment position. The predominant part of the path of the gripper holder from the receiving position into the alignment position is achieved particularly preferably by a movement of the gripper holder coupling. In addition, a significant amount of movement of the gripper holder can be performed to achieve the alignment position. To carry out such a movement, a drive device may be provided which is provided for pivoting the gripper holder and / or the blowing device. Preferably, the drive device is formed by a cylinder drive or includes such. The drive device is preferably coupled to the gripper holder coupling and to a swivel arm of the gripper holder. As a result, a pivoting of the gripper holder on the gripper holder coupling is achieved, for example, by the extension of the cylinder. As a result, preferably changes the angular orientation of the gripper holder for Greiferhalterkoppel.

Preferably, the abutment means and in particular the angle plate is pivotally coupled to the gripper holder and preferably synchronized driven by means of the same drive. Preferably, the gripper holder is pivotally received on the gripper holder coupling or pivotally coupled thereto.

Preferably, the gripper holder coupling between a lower receiving position and an upper transfer position is pivotable. An additional pivoting of the gripper holder is achieved in particular by the drive device, which aligns the gripper and the air nozzle or the air nozzles corresponding to the valve bag to be positioned.

In all embodiments, it is preferred that a transport device is provided for transporting an (aligned) valve sack, which comprises at least one belt strip and / or at least one roller strip. Preferably, the transport means is used to accelerate the valve bag (oriented in the vertical direction) in the direction of the filler neck and finally to shoot it up. During acceleration, the opening of the bag valve can take place.

It is preferred that the air nozzle is at least partially aligned in the direction of the V-shaped opening of the upper stop. Then, an air flow is achieved at least also in the direction of the upper stop, whereby a more reliable positioning is achieved.

Preferably, the blowing device comprises a tube with a plurality of air nozzles and is attached directly or indirectly to the angle plate. In this case, a plurality of passage openings are particularly preferably formed between the tube and the angle plate. The attachment of the blowing device to the angle plate can be done over several (narrow) webs. Through openings between the angle plate and the tube with the air nozzles are very advantageous, as this suction of the bag wall is prevented at the angle plate, since a venturi effect and concerns of the bag wall to the angle plate can be prevented.

In all embodiments, it is preferable to provide at least one additional nozzle, which is aligned from a first side in the direction of the receiving space. The additional nozzle acts on the first side surface of the valve bag. The additional nozzle offers considerable advantages, as it allows the positioning quality and thus the Aufsteckrate and Aufsteckquote can be further improved. The additional nozzle largely corresponds to the known from the prior art nozzle, but with only a difficult bag material and insufficient bag projections no sufficiently satisfactory result was achieved. As an additional nozzle in difficult cases, however, the reliability of Aufsteckung is further increased. When using both nozzles, the bag section is enveloped both from below and from above (on both sides) with a directed air flow. In particular, the bag section, on which the air nozzle and the additional nozzle act for defined alignment, is oriented obliquely to the vertical.

Preferably, the gripper is aligned in the transfer position and / or in the alignment position at an angle between about 30 ° and 80 ° and in particular between about 30 ° and 70 ° and preferably at about about 50 ° +/- 15 ° to the horizontal.

The auxiliary nozzle preferably blows on the wall arranged further up (upper wall) and the air nozzle on the wall arranged further down (lower wall).

The inventive method is used for attaching valve bags and in particular for attaching woven and / or sewn valve bags (for example, from ribbon fabric) on a filler neck of a particular rotating packaging machine, wherein in a receiving position a valve bag with a gripper gripped and in an alignment position of the valve bag with an air blast of an air nozzle (defined) is aligned. In this case, the gripper grips the valve bag on a first side wall and the air nozzle acts on the opposite second side wall to align the valve bag in at least partially vertical direction.

The method according to the invention also has many advantages. The method makes it possible reliably reliably plug valve sacks with a blind valve and two opposite side surfaces or side walls, even if the valve sacks have no or very short folded tabs and consist of flexible ribbon fabric.

Preferably, the gripper engages the upper side wall of a valve stack lying on a stack of sacks in order to subsequently align it in a defined manner. The air nozzle is aligned at least partially upwards to align and blows from below against the second side wall of the valve bag. At the same time the gripper is released and the valve bag is guided freely in the air flow. This ensures transport of the valve sack to the upper stop. The force required for transport is applied to the rough side wall of the valve sack by the blast of air. Preferably, the air nozzle blows from below against the bag wall located obliquely in the space and forms an air cushion between the wall of the valve bag and the angle plate, whereby the friction is reduced and a reliable transport to the top stop is ensured.

Advantageously, the air nozzle is operated with a flow of air at a higher level until a sensor detects the valve bag at an upper stop. Then the airflow can be reduced to a lower level or switched off. A reduction to a lower level prevents wrinkling in the upper area of the valve sack.

In all embodiments, it is preferred that at least one additional nozzle and in particular a plurality of additional nozzles direct an air flow to the upper side wall when the valve bag is to be aligned. In this case, the additional nozzle preferably emits an air stream when the air nozzle and the gripper holder have been pivoted toward each other at least a little. The air nozzle and the gripper holder are pivoted towards each other after a sack has been grabbed and lifted. The air flow of the auxiliary nozzle can be reduced or optionally switched off when a sensor detects the valve bag at the top stop. Alternatively or additionally, a Targeted blowing with the aid of the additional nozzle assist in loosening the valve sack from the grippers.

In all embodiments, it is preferable to carry out a gripper or all grippers as a sucker. In particular, the suckers are designed as suction cups.

In particularly preferred embodiments, the blowing device with the air nozzle or the air nozzles is first activated to align the valve bag. As a result, for example, a folded end of a valve sack can be brought back into the correct and correct position. The sucker then lets go of the valve bag, for example, by switching off the vacuum on the sucker. Depending on the bag material can then be activated in addition to the air nozzle still the additional nozzle, so that a particularly reliable transfer of the valve bag ensures the top stop and the release of the bag is supported by the suckers if necessary. The lower side wall of the valve bag slides on the air cushion of the air nozzle obliquely upwards until the valve bag rests against the upper stop. Then the air supply to the air nozzle can be switched off and reduced at the additional nozzle. This can save energy. In addition, a drape flexible bags on the top stop is reliably prevented. This positioning is maintained until the roller and belt strips have been closed and the previously oriented valve bag is accelerated in the direction of the filling machine.

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

• 1 eine schematische Draufsicht auf eine Packanlage mit einer Packmaschine und einer Vorrichtung zum Aufstecken von Ventilsäcken;
• 2 eine stark schematische Gesamtansicht der erfindungsgemäßen Aufsteckvorrichtung zum Aufstecken von Ventilsäcken;
• 3 einen Querschnitt durch die Aufsteckvorrichtung gemäß 2;
• 4 einen vergrößerten Querschnitt gemäß 3 in einer anderen Schwenkposition;
• 5 eine schematische Seitenansicht der mit dem oberen Anschlag verbundenen Blaseinrichtung;
• 6 eine stark schematisierte Darstellung der Aufsteckvorrichtung in einer ersten Position;
• 7 eine stark schematische Darstellung der Aufsteckvorrichtung nach 6 in einer zweiten Position; und
• 8 eine stark schematische Darstellung der Aufsteckvorrichtung nach 6 in einer dritten Position.

In the figures show:

• 1 a schematic plan view of a packing plant with a packing machine and a device for attaching valve bags;
• 2 a highly schematic overall view of the slip-on device according to the invention for attaching valve bags;
• 3 a cross section through the slip-on according to 2 ;
• 4 an enlarged cross-section according to 3 in another pivot position;
• 5 a schematic side view of the associated with the upper stop blowing device;
• 6 a highly schematic representation of the slip-on device in a first position;
• 7 a highly schematic representation of the slip after 6 in a second position; and
• 8th a highly schematic representation of the slip after 6 in a third position.

With reference to the enclosed 1 to 8th Below is an embodiment of a slip-on device according to the invention 1 explained. 1 shows a highly schematic plan view of a packing plant, the rotating packing machine 101 , a slip-on device 1 as well as a discharge belt 120 includes. The packing machine 100 for filling valve bags 10 has in the illustrated embodiment, six distributed over the circumference arranged filler neck 101 on, of which five fillers 101 each valve sacks 10 are arranged.

The packing machine 100 is in the plug-on position. The angle sensor 102 has previously the Vorbeirotieren the next filler 101 in the predetermined angular position 103 recorded and thus triggered the next Aufsteckvorgang. In addition to using one of the slip-on device 1 associated sensor (angle sensor 102 ), it is also possible to use a sensor provided in the packing machine which determines the angular position 103 detected.

The slip-on device 1 here has a empty bag magazine or empty bag cell band 110 , which is used for automatic transport of sack bundles or sack stacks 19 suitable is.

In the illustration after 2 becomes a bag-bundle 19 just on the as a shooting table 30 transported trained shelf. The shooting table 30 has a work surface on which several sack bundles 19 filed and edited one after the other.

The packing machine 100 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 kg and 50 kg and preferably between 20 kg and 50 kg and may also be larger or smaller depending on the application.

After grasping and lifting, the end of the valve sack may still be horizontal on the receiving table 30 rest.

The obliquely standing in the space aligned bag section of the valve bag is deflected during transport in the direction of the filler neck, so that the bag section is then oriented vertically before plugging.

Just before shooting the bag valve is opened by means not shown. For example, the blind valve can be opened by negative pressure or by an air flow and the Venturi principle, as it is in EP 2 455 288 B1 is described.

In 3 is a schematic cross-sectional view of the slip-on 1 to see. Shown is the plug-on head of the slip-on device. The slip-on device comprises a driven belt strip 31 and a roller bar 32, shown here in the closed position, in which there is a valve bag therebetween 10 is removed and can be shot on a filler neck.

The angle sheet 17 with the top stop 16 has an approximately V-shaped configuration and is oriented obliquely in space, so that a contact surface for a side wall of a valve bag has an angle between about 30 ° and 80 ° and in particular about 60 ° to the horizontal.

3 shows the slip-on device 1 in the alignment position 3 in which a valve bag 10 at the top stop 16 was aligned while the end is still on the shooting table 30 can lie down. Subsequently, the valve bag is placed on a filler neck of a packing machine 100 shot up.

After firing open the belt bar 31 and the roll bar 32 by the roller bar 32 is pivoted. This is also the gripper 5 pivoted downwards with increasing speed.

5 shows a schematic side view of the investment device 15 with that as an angle sheet 17 executed upper stop 16 that stuck with the blowing device 6 with the air nozzles 7 connected is. Here are the air nozzles 7 towards the end 17c of the second leg 17b the angle sheet 17 aligned. If there is a sack there for alignment, the air flow will be towards the top stop 16 in the sharp corner of the angle sheet 17 deflected so that at least part of the air flow of the air nozzles 7 through air openings 18 at the top stop 16 the investment facility 15 exit. This ensures that a valve bag can be reliably aligned, and that between the angle plate 17 and the valve bag 10 blown air of the air nozzles 7 upwards through the air openings 18 can escape.

Between the investment facility 15 and the blowing device attached thereto 6 are through holes 35 provided, between which narrow bars 36 (narrower than high) are present. Through the passage openings 35 will prevent being through the airflow 7a the air nozzle 7 the side wall 12 of the valve bag 10 Sucked on the wall of the investment device, as it can be caused by a Venturi effect.

With reference to the 6 to 8th the sequence of movements is explained below.

6 shows the gripper holder 4 in the receiving position 2, in which the gripper 5 the top valve bag 10 a sack pile 19 at the upper end, where the blind valve is provided, takes. This leaves a distance of 1 or 2 cm (or even 3 or 4 cm) between the gripper and the outermost end of the valve bag. By this distance, a collision with the not shown here stop edge for the bag stack 19 prevented.

The gripper holder 4 is here designed as a tube to the here designed as a sucker gripper 5 to supply with vacuum. The vacuum connection 40 gets through the hinge point 29 at the gripper holder coupling 8th guided.

When recording, it is possible that a raised and lowered fixation 34 , such as a sucker, the valve bag 10 at the end of the sack 14 is fixed to the valve bag 10 take off altogether and smooth something out.

The gripper 5 is on the gripper holder 4 attached. The gripper holder 4 is pivotable on the gripper holder coupling 8th added. The gripper holder 4 has a pivot arm 25, at one end of the cylinder drive 24 running drive device 23 attacks. The other end of the drive device 23 is pivotable on the gripper holder coupling 8th added. An extension of the cylinder drive 24 leads to a pivoting of the gripper holder 4 and the associated gripper 5 , Permanently connected to the gripper holder 4 also the additional nozzle 27 , which also air towards the valve bag in the receiving space 20 can blow. The additional nozzle 27 but does not blow on the same surface of the valve bag 10 like the air nozzle 7, but on the opposite side. supplemental 27 blowing on the same side, on the also the gripper holder 4 with the grippers 5 takes the valve bag.

The gripper holder 4 is articulated with a holding plate 37 connected, which in turn fixed to the angle plate 17 connected is. On the holding plate 37 also attacks the coupling rod 9 at the other end hinged to the gripper holder coupling 8th connected is. That means the retaining plate 37 articulated with the coupling rod 9 and the gripper holder 4 connected is. The gripper holder 4 is pivotable on the gripper holder coupling 8th recorded and can by extending the cylinder drive 24 from the in 6 position shown in the in 7 shown position transferred.

7 shows an intermediate position in which the gripper 5 and the angle sheet 17 have been swung a bit towards each other. At the same time, the gripper has 5 clearly from the sack stack 19 removed because the gripper holder coupling 8th through the pivot lever 8a and the counter-link 8b , which together form a parallelogram, has been raised.

The gripper 5 has the recorded valve bag 10 with the bag section 13 in the recording room 20 introduced, which is between the angle sheet 17 and the gripper holder 14 extends. On the foremost area of the valve bag 10 the airflow now works 7a from the air nozzles 7 the blowing device 6 one. The blowing device 6 blows with the air nozzles 7 from the second page 22 of the receiving space in the direction of the second or lower side wall 12 of the valve bag 10 , On the first or upper side wall 11 attacks from the first page 21 of the recording room 20 from the gripper 5 of the gripper holder 4 still the valve bag 10 and will be solved in this position.

By a further extension of the cylinder drive 24 becomes the slip-on device 1 in the in 8th shown transferred position in which the sucker 5 only a relatively small distance from the angle plate 17 having. The vacuum of the nipple 5 was previously switched off and a targeted air blast 7a from the air nozzle 7 became the valve bag 10 reliable at the top stop 16 positioned. The valve bag slides during positioning 10 on the through the air nozzle 7 provided air cushion and is reliably by the air flow up to the top stop 16 directed. The airflow 7a is doing through the bottom or the lower side wall 12 of the valve bag 10 aligned diagonally upwards here.

In addition, if required or for particularly difficult materials, an air flow from the additional nozzle 27 to be activated on the top 11 of the valve bag 10 impinges and supports also for a positioning of the valve bag at the top stop 16 provides.

Very schematically here is a sensor 28 represented, for example, optically the front end of the valve bag 10 at the top stop 16 detected. Following this, the airflow 7 and / or the airflow 27 be reduced in order to avoid wrinkles on the valve bag and also to reduce energy consumption.

If the valve bag 10 is aligned and the roller bar 32 against the belt strip 31 is closed, the valve bag is fixed and the air supply can be switched off.

Overall, the invention provides an advantageous clip-on device and an advantageous method, which also allows for flexible and sewn or woven valve bags high Aufsteckraten of much more than 2500 bags per hour with high Aufsteckquote. By a nozzle bar, which is aligned with the back of the valve bag, a reliable alignment of the valve bag can be achieved on an executed in particular as an angle sheet upper stop. Through the air nozzle (s), which acts on the valve bag from behind and below, a reliable plugging is made possible even with an end folded over at the upper end, since the folded air is reliably folded back by the air flow.

The invention provides for the first time a slip-on device with which inferior or wrinkled or bent valve bags can be plugged on, and for the first time provides automatic processing.

For fine adjustment, it is preferred that the blowing device as a whole or each individual air nozzle of the blowing device can be adjusted in terms of alignment and / or blowing strength in order to be able to set optimum conditions. In addition, it is preferable for each air nozzle (or all together) to control the timing and duration of the air supply (also individually).

LIST OF REFERENCE NUMBERS

1

slip-on device

2

pickup position

3

alignment position

4

Out Holders

5

grab

6

blower

7

air nozzle

7a

airflow

8th

Gripper holder coupling

8a

pivoting lever

8b

against handlebar

9

coupling rod

10

valve bag

11

first, upper side wall

12

second, lower side wall

13

bag portion

14

blind end

15

equipment installation

16

upper stop

17

Winkelblech

17a

first leg

17b

second leg

17c

End of 17b

18

air opening

19

bag stack

20

accommodation space

21

first page

22

second page

23

driving means

24

cylinder drive

24a

piston rod

25

Swing arm of 4

26

Transfer position of 8

27

supplemental

27a

airflow

28

sensor

29

joint

30

Shooting table

31

belt strip

32

roller strip

33

eccentric

34

fixing

35

Through opening

36

web

37

Halteblech

40

Vacuum connection for 4

100

packing machine

101

filling

102

angle sensor

103

predetermined angular position

110

Empty bag cell band

120

Austrageband

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2455288 B1 [0006, 0041]

Claims (23)

Attachment device (1) for attaching valve sacks (10), in particular for attaching woven and / or sewn valve sacks (10) to a filler neck (101) of a packing machine (100), with a between a receiving position (2) and an alignment position (3 ) movable gripper holder (4) with at least one gripper (5) to take a valve bag (10) in the receiving position (2) and with a blowing device (6) with at least one air nozzle (7) to the valve bag (10) in to align the alignment position (3), characterized in that between the gripper holder (4) and the blowing device (6) at least in the alignment position (3) a receiving space (20) for a bag portion (10) of the valve bag (2) is formed and that the gripper (5) from a first side (21) and the air nozzle (7) from an opposite second side (22) on the receiving space (20) are aligned to on opposite side walls (11, 12) of a in the receiving space ( 20) accommodated valve bag (10) act. Clip-on device (1) according to the preceding claim, wherein a contact device (15) with an upper stop (16) delimits the receiving space (20) and a valve bag (10) can be aligned in a defined manner. Clip-on device (1) according to the preceding claim, wherein the abutment device (15) comprises an angle plate (17) with the upper stop (16). Clip-on device (1) according to one of the preceding claims, wherein the gripper holder (4) is coupled to the blowing device (6). Clip-on device (1) according to the preceding claim, wherein the gripper holder (4) is movable relative to the blowing device (6). Clip-on device (1) according to one of the preceding claims, wherein air openings (18) are formed on the contact device (15). An attachment device (1) according to any one of the preceding claims, wherein the gripper holder (4) is pivotally received on a gripper holder coupling (8) and wherein the gripper holder coupling (8) is movable to move the gripper holder (4) from the receiving position (2) to the alignment position (3). Clip-on device (1) according to one of the preceding claims, wherein a drive device (23) for pivoting the gripper holder (4) and / or the blowing device (6) is provided, wherein the drive device (23) comprises in particular a cylinder drive (24). Clip-on device (1) according to the preceding claim, wherein the drive device (23) is coupled to the gripper holder coupling (8) and to a swivel arm (25) of the gripper holder (4). Clip-on device (1) according to one of the preceding claims, wherein the abutment means (15) is pivotally coupled to the gripper holder (4) and wherein the gripper holder (4) is pivotally received on the gripper holder coupling (8). Clip-on device (1) according to one of the preceding claims, wherein the gripper holder coupling (8) between a lower receiving position (2) and an upper transfer position (26) is pivotable. Clip-on device (1) according to one of the preceding claims, wherein a transport device for transporting a valve bag (10) is provided, which comprises at least one belt strip (31) and / or a roller bar (32). Clip-on device (10) according to one of the preceding claims, wherein the air nozzle (7) is at least partially aligned in the V-shaped opening of the upper stop (16). Attaching device (10) according to one of the preceding claims, wherein the blowing device (6) comprises a tube with a plurality of air nozzles (7) and is secured to the angle plate (17), wherein between the tube and the angle plate (17) has a plurality of through holes (35) are formed. Clip-on device (10) according to one of the preceding claims, wherein at least one additional nozzle (27) is provided and oriented from a first side (21) in the direction of the receiving space (20). Clip-on device (10) according to the preceding claim, wherein the auxiliary nozzle (27) is attached to the gripper holder (4). Method for attaching valve sacks (2), in particular for attaching woven and / or sewn valve sacks (10) to a filling neck (3) of a packing machine (1), wherein in a receiving position (2) a valve sack (10) with a gripper (10) 5) and in an alignment position (3) of the valve bag (10) with an air blast of an air nozzle (7) is aligned, characterized in that the gripper (5) the valve bag (10) on a first side wall (11) engages and the Air nozzle (7) acts on the opposite second side wall (12) and that then the gripper, the first Side wall releases to align the valve bag (10) in at least partially vertical direction. Method according to the preceding claim, wherein the gripper (4) engages the upper side wall (11) of a valve bag (10) lying on a stack of sacks (19). Method according to one of the two preceding claims, wherein the air nozzle (7) is aligned for alignment at least partially upwards and from below against the second side wall (12) of the valve bag (10) blows. Method according to one of the three preceding claims, wherein the air nozzle (7) is operated with a flow of air at a higher level until a sensor (28) the valve bag (10) at an upper stop (16) detected and the air flow then to a lower level is reduced or switched off. Method according to one of the four preceding claims, wherein at least one auxiliary nozzle (27) directs a flow of air on the upper side wall (11). Method according to one of the five preceding claims, wherein the auxiliary nozzle (27) emits an air flow when the air nozzle (7) and the gripper holder (4) have been pivoted towards each other at least a little. Method according to one of the six preceding claims, wherein the air flow of the auxiliary nozzle (27) is reduced or switched off when a sensor (28) detects the valve bag (10) on the upper stop (16).

Images