DE102015106788B4 - Transport device for the transport of standing containers - Google Patents

Abstract

Transport device for transporting standing containers, comprising - a first transport unit (2) with a holding and propelling device acting on the outer surface of the container (3), - a container lifting device (11) and - a fixed guide unit (17) being arranged, and wherein the lifting device (11) is designed to lift the containers (3) onto the guide unit (17) designed for transport into a second transport unit (4), characterized in that the lifting device (11) is in the region of a floor guide (9 ) the first transport unit (2) is arranged and acts on a beverage container bottom.

Description

The invention relates to a transport device for transporting standing containers with a first transport unit, which has a holding and propelling device acting on the outer contour or surface of the containers.

There are basically two different types of transport devices. There are, on the one hand, transport devices with holding and propulsion devices that engage the bottom and belly area of the containers and, on the other hand, transport devices with container clamps that firmly grip the container in the area of neck rings.

While the JP 2011-251819 A disclosed only the transport of containers with container clamps, for example, disclose JP 2011-230781 A and the WO 2008 129346 A1 the transport of containers by means of container clamps and rail systems attacking the neck ring.

So it shows JP 2011-230781 A a device for producing and filling plastic bottles and for transferring the filled bottles from a container clamp guide into a neck ring and bottom guided transport device, while the WO 2008 129346 A1 shows a transfer star with which bottles guided in a neck ring system are transferred in container clamps.

Transport devices with holding and propulsion devices acting on the bottom and belly region of the containers are used in particular as star transporters. These usually have a star wheel designed as a driving device with star pockets designed to hold the containers. An outer guide for stabilizing the containers is also arranged around the star wheel, so that the containers are positioned in the star pockets and transported along a floor guide by the star transporter.

The container usually passes through different stations of a container treatment system standing on the floor guide. The container is smoothly moved between the transport units assigned to the stations. For example, a container in a first station is filled with a liquid, for example with a drink, transferred from a transport star to a closing star and closed with a lid in the associated closure device. The further transport then takes place, for example, to a packaging unit.

While some stations are largely insensitive to different container dimensions when passing through the container treatment plant, other stations, for example sealing stations, can only seal containers of the same height at the same time.

Particularly in the case of plastic beverage bottles with a neck ring, changes in shape, in particular in terms of length, occur in the bottom and belly area of the bottle, already due to production, but especially due to the ever increasing rate of reuse for reusable bottles, so that the container runs through the entire container treatment system without errors a comprehensive pre-sorting of the containers must be carried out. The outlay for sorting out the defective containers thus also increases steadily with the increase in the reuse rate, the number of containers being removed due to the lack of processability having a particular direct effect on the production costs of the plant operator.

The invention is based on the object of providing a transport device with which containers of different heights can be transported simultaneously through a container treatment system and processed by the latter.

The object is achieved by a transport device with the features of claim 1. Advantageous developments of the invention are specified in the subclaims.

The inventive transport device for conveying standing containers has a first transport unit with a holding and propelling device acting on the outer contour or surface, in particular in a bottom and belly region of the containers, a container lifting device and a fixed guide unit for the neck ring and / or the mouth region the container guide unit, wherein the lifting device is designed to lift the container onto this guide unit.

The invention is based on the idea of decoupling the working height of individual processing stations of a container treatment system from the height of the container by changing the transport device feeding the container from a bottom guide of the container to a neck ring guide.

Since the distance from the outer mouth area to the neck ring is standardized for containers, in particular beverage bottles, is largely insensitive to signs of wear and largely independent of the height of the container, the section-wise conversion from a floor guide to a neck ring guide enables simultaneous processing of containers whose height differences go beyond the usual production tolerances.

The inventive transport device makes it possible in a particularly advantageous manner to raise the containers standing on a floor guide, which are picked up in the abdominal region by a first transport unit, in particular a transport star, and are guided by this through the first transport unit, and to be placed on a neck ring guide with its neck ring and transfer it to a second transport unit. The container remains in a standing, i.e. in an upright vertical position. The inventive transport device enables containers of different heights to be carried out and processed by different stations of a container treatment system, whereby the basic, particularly durable transport system consisting of belly guide, star wheel, external guide can be retained and no section-wise conversion to, for example, neck ring-guiding container clamps has to be carried out. The inventive transport device is thus in particular also designed as a device for retrofitting existing container treatment systems.

The inventive transport device not only increases the tolerance range of the acceptable container height of the processing stations, but also enables containers with different heights to be guided through the transport device from the outset and processed at the same time in the corresponding treatment stations, in particular locked in a closure unit.

The neck ring guide and possibly also the container lifting device can be designed as a grinding guide along which the container is guided in a sliding (sliding) manner. Both the neck ring guide and the container lifting device are in particular without clips, i.e. without the container clamp gripping the container individually.

Containers are understood to mean in particular bottles with a neck ring, for example beverage bottles. The bottles can be made of plastic, for example, and can be designed as disposable or reusable bottles.

A first transport unit is understood to mean, in particular, a transport star which has different track elements and which, for example, has a star wheel designed as a driving device with star pockets for grasping the container in the abdominal and / or neck region. Another track element of the transport unit can be a fixed outer guide which is arranged around the star wheel, the star wheel and the outer guide being matched to one another in such a way that the container in the star pocket and possibly on the outer guide conveys through the transport unit by means of the star wheel becomes.

Furthermore, the first transport unit has a floor guide, in particular a fixed floor guide, which is designed to set up the container with the container base and on which the container slides along with its base when it is passed through the transport unit. The floor guide can be designed, for example, as a floor rail or bar.

In contrast to the first transport unit, the second transport unit, into which the guide unit transfers the container, has, for example, a driving and / or holding device engaging in the neck region of the container and an external guide.

A container lifting device is understood to mean a device that moves the container in the direction of the longitudinal axis of the container, i.e. the standing container in the vertical direction, lifting up and lowering if necessary. The containers can, for example, run through a trajectory that runs obliquely upwards.

The container lifting device is matched to a fixed guide unit in such a way that the container with its neck ring is placed on the guide unit due to the lifting process. The container lifting device is designed, in particular, to lift a container that is coming from a transport star (first transport unit) of a filling machine but is filled with a liquid, for example a beverage, but is open and to transfer it to a closing star (second transport unit) of a closing station.

When the container is lifted, it is still in the star pockets and possibly on the outer guide, but is shifted vertically upwards within the star pockets and possibly on the outer guide.

A guide unit is understood to mean a structure that engages below the neck ring of the container, so that the container rests with its neck ring on the guide unit, is supported on it and in particular is freely suspended in the vertical direction and is only transported by the star pockets and the external guide, stabilized .

The guide unit is fixed and therefore not designed as a container clamp. In connection with the guide unit, fixed is understood to mean that the guide unit moves its position relative to the container when the container is being transported first transport unit, in particular with respect to an external guide, not changed.

The container lifting device is also advantageously fixed in its relative position in the first transport unit. However, at least parts of the container lifting device can be moved, for example pivoted or rotated about its own axis. A container lifting device is therefore not to be understood in particular as a container clamp for lifting the container which includes the container.

The container lifting device can be designed differently. For example, it is possible to design the lifting device as a lifting roller or lifting wheel. The lifting device can also be designed, for example, as a rising endlessly circulating belt. Alternatively, the lifting device can also be arranged as a parallel rotating shaft leaf onto which the container is pushed. However, the container lifting device is in particular designed as a grinding guide along which the container slides. According to a further development of the invention, it is provided that the lifting device has a ramp for lifting the container. A ramp is to be understood as meaning a structure which is arranged obliquely with respect to the longitudinal axis of the container, onto which the container conveyed by the propulsion device is pushed and moved vertically upwards along an inclined movement path.

The lifting device can be arranged in the first transport unit at different positions. It can be provided, but not part of the invention, that the lifting device is arranged in the area of the container corner ring. In this case, for example, the container conveyed by the propulsion device is pushed with its neck ring onto the lifting device, raised by the latter and guided to a guide unit.

A lifting device arranged in the area of the container corner ring can accordingly be designed as a ramp, so that the container conveyed by the propulsion device is guided to an inlet area of the ramp, placed on the ramp with the neck ring and pushed upwards along the inclined ramp onto the guide unit.

For this purpose, the lifting device has at least one neck ring sliding body, preferably two neck ring sliding bodies running next to one another and spaced apart from one another obliquely upwards. The neck ring sliding bodies can, for example, be rod-shaped, the neck ring sliding bodies being arranged as plate-shaped bodies running obliquely upwards for a particularly stable design. With such a ramp acting on the container corner ring, the container conveyed by the propulsion device runs into the area between the two neck ring sliding bodies and rests on the underside of the neck ring on the latter. In order to simplify the reception of the container, the two spaced-apart neck ring sliding bodies are arranged at least in sections with a tapering distance from one another (funnel-shaped) in the transport direction of the container.

As an alternative to a lifting device arranged in the area of the container corner ring, a further development of the device provides that the lifting device is arranged in the area of the floor guide of the first transport unit and acts on the floor of the container. A lifting device arranged in the area of the floor guide can also advantageously be designed as a ramp. The ramp is aligned with a first end at the level of the floor guide and points diagonally upwards with its second end, so that the container conveyed by the propulsion device is pushed onto the first end of the ramp and on the ramp in the vertical direction, at the star wheel pocket and sliding along the outer guide, sloping upwards.

For particularly secure guidance of the container, the ramp arranged in the base area preferably has two slide rails which are arranged such that they engage two opposite outer areas of the base of the container. The spaced-apart slide rails enable a particularly safe and stable transport of the container on the ramp.

In order to be able to compensate for particularly large differences in the container length and to carry out the transfer from the lifting device to the guide unit as largely as possible without impulses, according to a further development of the device it is provided that the lifting device is movable and a stop for the container is arranged which detects the lifting movement of the container limited.

A movable lifting device is understood in particular to mean that the lifting height, ie the vertical height possible by the lifting device and which the container can be raised, is adjustable. In particular when the lifting device is designed as a ramp, the angle of inclination of the ramp can be made adjustable. The ramp can also be designed as a dynamic ramp, for example, which yields downward when the container is pressed onto the ramp. The mobility of the lifting device can be designed in particular via a mechanical spring or a hydraulic, pneumatic or electrical device. The main advantage of such a dynamic ramp is shown in the Possibility of being able to process directly consecutive containers with significantly different container heights reliably and with a high overall performance.

For the purposes of the invention, a stop is understood to mean a structure against which the container bumps when it is lifted by the lifting device and which stops the lifting movement of the container. The stop is designed in particular as a grinding guide, so that the container guided by the lifting device against the stop and moved by the propulsion device grinds along the stop, at least until the guide unit has attacked below the neck ring of the container. The stop, in particular in combination with the dynamic ramp, enables a particularly safe and pulse-free transfer of the container to the guide unit, so that, for example, in the case of open containers filled with a liquid, no liquid spills out of the container.

The combination of a movable lifting device, in particular a movable ramp and a stop, also prevents the container from jamming between the stop and the lifting device. The movable lifting device and the stop also enable the transport of containers with particularly large differences in height.

The stop can be designed differently. The stop is particularly preferably designed as a mouth stop, neck ring stop and / or shoulder stop. A mouth stop is understood to mean a stop in which the container with its open mouth area is in contact with the stop. The muzzle stop is structurally particularly easy to form and ensures that the container is guided particularly precisely, independently of the container body.

A neck ring stop is understood to mean a stop in which the container abuts the stop with the top of the neck ring, as a result of which the upward movement of the container is prevented. The neck ring stop is particularly advantageous because, on the one hand, it prevents possible contamination which, for example, can penetrate into the open container from a muzzle stop, is particularly easy to clean and likewise ensures particularly precise guidance independent of the container body.

A shoulder stop, on the other hand, is a stop that is connected to the container shoulder, i.e. the transition area between the mouth area and the container belly comes into contact. The shoulder stop is particularly easy to clean.

As already mentioned, the guide unit particularly preferably has a neck ring receptacle for reaching under the neck ring arranged on the container and thus for supporting the neck ring. The neck ring receptacle can be designed as a one-sided receptacle that engages under the neck ring on one side of the container. However, the neck ring receptacle can advantageously be designed as a two-part neck ring receptacle with two spaced-apart neck ring receptacles, in which the container is guided through in the area of the distance between the neck ring receptacles and with its neck ring lying on the neck ring receptacles.

For particularly secure guidance of the container and, for example, when the neck ring receptacle is designed as a one-sided neck ring receptacle, it is provided according to a development of the invention that the guide unit has a channel designed to receive the mouth region of the container. The channel is intended to engage the side flanks of the mouth region, for example, threaded sections for a screw-on cover, and to stabilize the container when it is passed through the guide unit. The channel can be designed as a closed channel, the channel cover, for example, forming a muzzle stop. Alternatively, the channel can also be designed as an open channel without a channel cover.

• 1 zeigt schematisch in einer perspektivischen Darstellung eine erste Ausführungsform einer Transportvorrichtung mit einer Behälterhebevorrichtung zum Transport eines Behälters von einer ersten in eine zweite Transporteinheit;
• 2 zeigt schematisch in einer perspektivischen Darstellung einen frei geschnittenen Teilausschnitt aus 1 mit einer schräg angestellten als Rampe ausgebildeten Behälterhebevorrichtung;
• 3 zeigt schematisch in einer perspektivischen Darstellung die Ausführungsform aus 1 und 2 mit einem auf der Rampe stehenden Behälter;
• 4 zeigt schematisch in einer perspektivischen Darstellung die Ausführungsform aus 1 bis 3 mit einem an einem Anschlag anliegenden Behälter-Mündungsbereich;
• 5 zeigt schematisch in einer perspektivischen Darstellung eine zweite Ausführungsform der Transportvorrichtung mit einer Behälterhebevorrichtung zum Transport eines Behälters von einer ersten in eine zweite Transporteinheit;
• 6 zeigt schematisch in einer perspektivischen Darstellung einen frei geschnittenen Teilausschnitt aus 5 mit einem auf einer Rampe aufstehenden Behälter;
• 7 zeigt schematisch in einer perspektivischen Darstellung die Ausführungsform aus 6 mit einem am Anschlag anliegenden und auf einer Neckringaufnahme aufliegenden Behälterneckring;
• 8 zeigt schematisch in einer perspektivischen Darstellung eine Führungseinheit aus 1;
• 9 zeigt schematisch in einer perspektivischen Darstellung eine Führungseinheit aus 5.

The invention is explained in more detail below on the basis of exemplary embodiments:

• 1 shows schematically in a perspective view a first embodiment of a transport device with a container lifting device for transporting a container from a first to a second transport unit;
• 2nd shows schematically in a perspective view a free cut partial section 1 with an inclined container lifting device designed as a ramp;
• 3rd shows schematically in a perspective view of the embodiment 1 and 2nd with a container standing on the ramp;
• 4th shows schematically in a perspective view of the embodiment 1 to 3rd with a container mouth area abutting a stop;
• 5 shows schematically in a perspective view a second embodiment of the transport device with a container lifting device for transporting a container from a first to a second transport unit;
• 6 shows schematically in a perspective view a free cut partial section 5 with a container standing on a ramp;
• 7 shows schematically in a perspective view of the embodiment 6 with a container corner ring resting against the stop and resting on a neck ring holder;
• 8th shows schematically a perspective view of a guide unit 1 ;
• 9 shows schematically a perspective view of a guide unit 5 .

1 shows schematically in a perspective view a first embodiment of the inventive transport device 1 , which is arranged in a container treatment system (not shown here). The transport device 1 has a first transport unit 2nd on, which is designed as a transport star in the area of a filling machine (here upstream, but not shown).

One on a walkway (arrow direction A ) of containers 3rd , here bottles with a neck ring 6 , through the first transport unit 2nd subsequent second transport unit 4th is also a transport star, here in the area or as a lower device section of a closure device, not shown, for closing the container 3rd , and is thus designed as a capping star. To this second transport unit 4th borders a third transport unit 5 to run the container 3rd from the transport device 1 on. The containers 3rd are shown in a transparent manner in all figures and device sections for a better view.

The three transport units 2nd , 4th , 5 are for standing transport of the containers 3rd educated. The transport units 2nd , 4th , 5 each have a star wheel designed as a propulsion device 7 and one around the star wheel 7 arranged external guidance 8th on. Both the star wheels 7 as well as the outside tours 8th each have two levels. It is also in the first transport unit 2nd a floor guide 9 shown on the container 3rd when passing through the transport unit 2nd slide along.

The three transport units 2nd , 4th , 5 thus have a grinding guide for the containers 3rd on where the container 3rd from the star wheel 7 driven on the outside guide 8th and the first and third transport units 2nd , 5 standing on the floor guide 9 can be slid along (sliding). That is, in the first and third transport units 2nd , 5 the containers are aligned in height 3rd through the floor guide 9 .

The second transport unit 4th is for hanging transport of the vertically aligned containers 3rd intended. The second transport unit points to this 4th a neck ring star wheel instead of a floor guide 10th and a neck ring outer guide 8a on. While the Neckringsternrad 10th Recesses 20 to support the neck ring 6 of the container 3rd has, is on the Neckring outer guide 8a a guide section 21 arranged on which the neck ring 6 slides along during transport. The container 3rd is thus through the second transport unit 4th hanging and focusing on the recesses 20 the Neckringsternrads 10th and the guide section 21 the outside guidance 8a transported in a supportive manner, which ensures exact height alignment of the container 3rd in the second transport unit designed as a capping star 4th is guaranteed. The Neckringsternrad 10th and the Neckring outer guide 8a are above the star wheel 7 and the outside guidance 8th arranged.

Alternatively, the Neckringsternrad 10th also be designed as a star wheel with a large number of grippers, in which case an outer neck ring guide is generally not required.

In order to hand over the container 3rd from the first transport unit 2nd into the second transport unit 4th Height differences of the containers 3rd to compensate is a container lifting device 11 arranged. The container lifting device 11 is in the area of the floor guide 9 the first transport unit 2nd arranged and has one on the floor 12th of the container 3rd acting ramp 13 (please refer 2nd ) on. The ramp 13 is movable as a dynamic ramp 13 trained so that the slope of the ramp 13 , ie the degree of inclination of the ramp 13 , is adjustable. For this, the lifting device 11 a pneumatic unit 14 on that with one end 13a at the bottom of the ramp 13 connected is. The ramp 13 is by means of the pneumatic unit 14 to one at the level of the floor guide 9 pivoted end 13b pivotable. Alternatively, the lifting device 11 , especially a ramp 13 , also in the area of the neck ring 6 the container 3rd be arranged.

One from the star wheel 7 through the first transport unit 2nd guided standing container 3rd is transported on and over the ramp 13 guided. He slides up the ramp at an angle, ie he is off the ramp 13 vertically (container longitudinal axis direction) so that it is in the star wheel 7 , here in the star pocket 15 and on the outside guide 8th , slides up. To get through the ramp 13 Limiting the generated lifting movement is a guide unit 17th , here with one for a muzzle area 3a of the container 3rd trained stop 16 (please refer 3rd ) on the first transport unit 2nd , arranged.

The star wheel 7 transported containers 3rd is thus off the ramp 13 raised up to the mouth area 3a of the container 3rd against the (muzzle) attack 16 bumps. So the container 3rd between the stop 16 and the lifting device 11 the pneumatic unit is not pinched 14 resiliently designed so that the counter pressure of the stop 16 adjacent container 3rd yields. The (dynamic) ramp 13 is from the container touching the stop 3rd pressed down. Alternatively, instead of a spring-loaded pneumatic unit 14 For example, a spring unit can be arranged.

The guide unit points to particularly secure guidance 17th a guide channel 18th on the side walls 18a (please refer 8th ) the container 3rd with the flanks 3b or partial areas of the flanks 3b (especially the lower areas) of the mouth area 3a for safe guidance. A manhole cover is as a stop 16 educated.

The management unit also points 17th a neck ring admission 19th to reach under (see 4th ) of the neck ring 6 is trained and arranged.

After reaching under the neck ring holder 19th under the neck ring 6 the container slips 3rd due to further transport through the star wheel 7 off the ramp 13 down and is in the vertical direction (container longitudinal axis direction) from the neck ring holder 19th and that on the guide channel 18th adjacent mouth area 3a kept, the container 3rd still in the star pocket 15 of the star wheel 7 and if necessary on the outside guide 8th is present.

The leadership unit 17th is designed so that it is on the neck ring holder 19th overlying and in the guide channel 18th guided container 3rd into the second transport unit 4th transferred (transported) to where the container 3rd with his neck ring 6 on one of the recesses 20 of the neck ring star wheel 10th and the guide section 21 lies on. When transferring the container 3rd also in one of the star pockets 15 of the star wheel 7 the second transport unit 4th introduced. The container 3rd hangs in the second transport unit 4th at the neck ring 6 , is from the star wheel 7 the second transport unit 4th captured and is by this by the second transport unit 4th guided. A floor guide 9 is not arranged.

Due to the support of the neck ring 6 on the recess 20 and the guide section 21 is the altitude of the mouth area 3a regardless of the total container height exactly defined, so that the closure device through which the second transport unit 4th leads, the container 3rd can close particularly securely and easily and regardless of the total container height.

For particularly safe threading of the mouth area 3a of the container 3rd in the guide channel 18th , is the guide channel 18th in a first section 18a (please refer 8th ) in the direction of transport A the first transport unit 2nd tapered (funnel-shaped).

After closing the container 3rd in the closure device with a lid 23 and the further transport of the container 3rd through the second transport unit 4th , the container 3rd into the third transport unit 5 transferred. For this is on the third transport unit 5 a container outlet device 24th arranged. The third transport unit shown here 5 can alternatively also be designed as a linear conveyor, for example.

Both the leadership unit 17th as well as the container outlet device 24th and the Neckringsternrad 10th with external neck ring guide 8a can also be used as a retrofit kit for existing transport devices due to their particularly simple construction 1 be used.

5 shows the transport device 1 with an alternative embodiment of the guide unit 17th . This has two partial stops 16a , 16b on that instead of a stop 16 in the container mouth area 3a as a stop 16 for the neck ring 6 are trained. Here is the second partial stop 16a over two brackets 22 to the first partial stop 16b spaced apart. Between the two partial stops 16a , 16b is the guide channel 18th (see 9 ) educated. The leadership channel 18th is designed in this embodiment as a channel open at the top, ie without a channel cover, which in particular prevents dirt from entering the container 3rd is avoided.

6 shows the one from the ramp 13 slightly raised container 3rd when entering the guide channel 18th , while 7 the one with his neck ring 6 at the above the neck ring 6 arranged partial stops 16a , 16b adjacent and on the neck ring holder 19th overlying container 3rd shows. The container 3rd has due to the transport movement of the star wheel 7 leave the ramp again and hang in the vertical direction on the one on the neck ring holder 19th overlying neck ring 6 .

The second embodiment of the guide unit 17th can be used as a retrofit kit for existing systems and transport devices.

Reference list

1

Transport device

2nd

first transport unit

3rd

container

3a

Mouth area container

3b

Flanks

4th

second transport unit

5

third transport unit

6

Neck ring

7

Star wheel

8th

External guidance

8a

Neckring outer guidance

9

Floor guide

10th

Neck ring star wheel

11

Lifting device

12th

Bottom container

13

ramp

13a

first end ramp

13b

rotating end ramp

14

Pneumatic unit

15

Star pockets

16

attack

16a, 16b

Partial stops

17th

Guide unit

18th

Guide channel

18a

first section

19th

Neck ring admission

20

Recess

21st

Guide section

22

Support bracket

23

cover

24th

Container discharge device

A

Transport direction container

Claims (9)

Transport device for transporting standing containers, comprising - a first transport unit (2) with a holding and propelling device acting on the outer surface of the container (3), wherein - a container lifting device (11) and - a fixed guide unit (17) are arranged, and wherein - the lifting device (11) is designed to lift the containers (3) onto the guide unit (17) designed for transport into a second transport unit (4), characterized in that the lifting device (11) in the region of a floor guide (9 ) the first transport unit (2) is arranged and acts on a beverage container bottom. Transport device after Claim 1 , characterized in that the lifting device (11) has a ramp (13) for lifting the container (3). Transport device according to one of the preceding claims, characterized in that the lifting device (11) is movable and a stop (16) for limiting the lifting movement of the container (3) is arranged. Transport device according to one of the preceding claims, characterized in that the lifting device (11) guides the container (3) with a mouth region (3a), a neck ring region or a shoulder region against the stop (16). Transport device according to one of the preceding claims, characterized in that the guide unit (17) has a neck ring receptacle (19) for reaching under the container corner ring (6). Transport device according to one of the preceding claims, characterized in that the guide unit (17) has a channel (18) designed to receive a mouth region (3a) of the containers (3). Transport device according to one of the preceding claims, characterized in that the guide unit (17) is designed for transferring the container (3) into a second transport unit (4). Transport device according to one of the preceding claims, characterized in that the second transport unit (4) is a device part of a closing device for containers (3). Transport device after Claim 8 , characterized in that the closing device is a closing star.

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