WO2010086001A1

WO2010086001A1 - Method and device for processing double-chamber bags having different geometries

Info

Publication number: WO2010086001A1
Application number: PCT/EP2009/009000
Authority: WO
Inventors: Thomas Matheyka; Andreas Heimsoth
Original assignee: Khs Ag
Priority date: 2009-01-29
Filing date: 2009-12-16
Publication date: 2010-08-05
Also published as: DE102009005311A1; PL2391548T3; EP2391548B1; ES2389765T3; EP2391548A1

Abstract

The invention relates to a method and to a device for opening a bag (1) to be filled and comprising at least two chambers (2, 3) having different geometries, sealingly separated from each other by means of at least one inner seam (6) and connected to each another. In order to achieve that bags and the differently sized chambers thereof can be reliably opened and closed, the invention proposes that at least one inner gripping element (10) engages at the inner seam (6), wherein one outer gripping element (11, 12) each engages an edge area (7, 8) in a starting position (21), wherein at least two of the gripping elements (10, 11, 12) are displaced relative to a fixed (10, 11, 12) gripping element into a respective end position (13, 14), wherein the displacement paths (15, 16) of the relatively displaceable gripping elements (10, 11, 12) comprise different magnitudes.

Description

Method and device for processing double-chambered bags with different geometries

[0001] The invention relates to a method for opening a bag to be filled, which has at least two chambers, each with a different geometry, which are sealingly separated from one another by at least one inner seam and connected to one another. However, the invention also relates to a device for opening a bag to be filled, which has at least two chambers each with different geometry, which are at least one inner seam sealingly separated and interconnected.

Such bags are used for example as packaging for pourable or flowable, so fillable goods. They are, for example, formed from a flat wrapping material web, for example from a plastic, wherein a bottom of the bag is folded and possibly sealed. The respective sides of the bag are closed, so that a bag is formed which has at least one open end for filling the head. Such bags are increasingly being used, in particular, as stand-up pouches because, owing to their flexible, outer casing, they offer considerable advantages when transporting the empty and filled pouches and disposing of the empty pouches. Depending on the use, the bags are made with or without spouts.

Prefabricated bags are fed to a filling and closing system, filled and then sealed. It is also conceivable, however, to form, fill and then close the bags in a mold, fill and close system starting from the flat wrapping web.

To fill the bag this must be opened at its top so that a sufficiently large filling opening is formed. This can be achieved, for example, by moving the outer edges of the bag mechanically, pneumatically or by motor to the center of the bag, for which purpose, for example, pliers act on the edges of the bag. Simultaneously with the compression of the bag, the gripper or suction device effects an opening movement of the head side oriented perpendicularly to the compression movement of the bag material becoming tension-free. As a result, the bag or its head side is opened virtually elliptical, and allows the entry of the goods to be filled first. In such operations, either individual bags or several bags can be processed simultaneously, so at least be opened and filled. As a rule, these are geometrically identically designed bags which are constructed symmetrically, ie have only one chamber, or have two chambers which have the same geometric designs.

But also known as a double-chamber or duplex bag, which consists of two individual bags, which are characterized by a connecting seam, so each have an outer and sometimes slightly wider inner seam. But it is also possible to produce a double-chamber or duplex bag, which is formed as before from a Hüllstoffbahn, wherein the chambers are tightly separated from each other via an inner seam to be created but interconnected. Here, inner seam is designed as a central seam, so that it is arranged on a central axis of the double-chamber or duplex bag so that the two chambers each have the same geometric configurations. If the two chambers are symmetrical, one pliers of a pair of pliers with center fingers can engage the respective outer edge of the respective chamber, since the degree of bag compression and thus the degree of bag opening is identical for both chambers of a double-chamber or duplex bag.

But are also conceivable Doppelkammer- or duplex bag, both chambers has different geometries. So one of the chambers can be made larger than the other. Both chambers can be filled with different contents. For example, prefabricated foods such as noodles, rice, corn or the like, or even dehydrated protein products, could be filled in the larger chamber. In the much smaller chamber then liquids, such as oil, sauces or pastes could be filled. Of course, the fillings should only be mentioned as examples. It is also conceivable to fill the larger chamber with chemically reactive components and the smaller chamber with a reaction liquid (for example, adhesive and hardener).

[0008] If such bags are to be filled with chambers of different geometries, that is to say of different sizes, the problem arises that the respective different chambers can not be sufficiently opened for filling, since these require geometrically different compression and opening paths, to open the respective head side sufficiently, in order to avoid a loss of product. Accordingly, the head side after filling must be which are closed in order to achieve adequate sealing of the head side.

[0009] Based on the above-mentioned problem, the object of the invention is to provide a method and a device by means of which sufficient opening and closing of the respective head side of the differently configured chambers in their geometric configuration can be achieved.

Erfindemäß the procedural part of the object is achieved by a method having the features of claim 1, wherein the device-technical part of the object is achieved by a device having the features of claim 7.

Advantageously, at least one inner gripping element is provided that acts on the at least one inner seam, wherein each engage an outer gripping element as first and second outer gripping element respectively in a starting position respectively at a first and second edge region of the respective chamber, wherein at least two of the gripping elements relative to a position-fixed gripping element are transferred to a respective end position, wherein both travel paths of the positionally fixed gripping element relatively movable gripping elements in the respective end position preferably by means of an adjustable to the respective chamber geometry lever system have different amounts.

In a preferred embodiment, it is provided that the two outer gripping elements are transferred into the end position relative to the inner gripping element, the two outer gripping elements being oppositely oriented being moved in the direction of the positionally fixed inner gripping element, the two upsetting paths of the outer gripping elements each having a different magnitude exhibit.

The invention is based on the finding that Doppelkammer- or duplex bag, so the differently constructed in their geometry chambers have different compression and opening paths. This has made the processing, so for example, the filling of the respective chambers, for example on horizontal Pouch processing machines extremely complex or even impossible. With the invention, however, this is counteracted by the relatively movable gripping elements, ie preferably the first and second outer gripping element via the adjustable to the geometric configuration of the chambers lever system corresponding Have different compression paths or travel paths to their respective end position.

[0014] It is expediently provided that the inner gripping element is positionally fixed, that is, held unchangeable in its position, when the two outer gripping elements are transferred into the respective end position relative to the Inngreifelement. The two outer gripping elements are thus advantageously transferred in the direction of the Inngreifelement in the end position, so that the head side of the respective chamber opens elliptical. Of course, the respective opening paths to the respective geometric configuration of the chambers have different amounts. Of course, it can also be provided that one of the outer gripping elements is fixed in position, that is held unchangeable in its position, wherein the inner gripping element and the other outer gripping element is transferred relative to the positionally fixed gripping element in the respective end position. Of course, in this embodiment, the inner gripping element and the other outer gripping element would have equally oriented travel paths relative to the positionally fixed outer gripping element into the respective end position. This could initially be done so that the inner gripping element is transferred in the direction of the positionally fixed outer gripping element in its final position. The other outer gripping element can be carried along accordingly, and at least initially keep the head side of the chamber, which has not yet been opened, under tension. If the inner gripping element reaches its end position, this is held fixed in position in this, and the relatively movable outer gripping element is continued in its end position.

Appropriately, it is provided that the respective gripping elements, so the two outer gripping elements and the attack at least one inner gripping element on a common horizontal plane of the multi-chamber bag in the starting position to achieve a respective compression movement substantially in the linear direction. In a preferred embodiment, it is provided that the respective gripping elements engage in the vicinity of the head side in the starting position. If the multi-chamber bag is provided with outer bag grippers, it can be provided to allow the respective gripper elements to act on the height of the bag gripper.

It is expedient in this case if the respectively fixed to the position-fixed inner gripping element relatively movable outer gripping elements are converted via an adjustable lever system to the lever system in the respective end position. The Hebelarmverhältnis is suitably adjustable to different chamber geometries so different chamber sizes different multi-chamber bag. This means that the Hebelarmverhältnis is always adaptable to each new conditions, possibly from bag to bag, or preferably from bag to bag series. For this purpose, a corresponding detection and evaluation unit can be provided, which verifies and determines the passing bags, and forward the results to a corresponding control device, which can effect the adjustment of the required Hebelarmverhältnisses.

In a favorable embodiment it can be provided that the two relatively movable gripping elements, preferably the two outer gripping elements are articulated by means of adjustable Hebelarmverhältnis at a central pivot point, which acts on a cam roller, so that the two outer gripping elements can be controlled in their traversing way , Advantageously, a simultaneous opening of the differently sized chambers can thus be achieved with a single curved path.

It is within the meaning of the invention if the movement of the relatively movable gripping elements, preferably the outer gripping elements which are relatively movable relative to the positionally fixed gripping element, is not only achieved by means of the mechanical lever arm ratio, but is controlled by a motor, whereby a combination of both approaches is of course possible ,

If the two chambers filled with the respective contents, both chambers are sealed. For this purpose, the procedure is reversed analogously to the procedure described above. Here is a further advantage of the invention to see, because by the adapted travels, can advantageously be created a wrinkle-free, clean and product-safe top seam.

So that the respective gripper elements can engage in their respective starting position at the required locations, it is advantageously provided that the respective gripping elements have opposing, and zusammenführbare gripping areas, wherein preferably at least one of the gripping areas is arranged on a U-shaped overreaching area. In an advantageous embodiment can be provided that one of the gripping areas is designed to be movable relative to the other. Conveniently, the respective gripping element has a rigid gripping area and an axially movable gripping area to this. In this respect, a gripping element with pincer-like gripping areas is designed in an advantageous embodiment.

It is useful if the rigid gripping area is arranged at a gripping end of the gripping element. The overreaching area can have the movable gripping area, which has a displacement element and a bolt-like holding mandrel. Between the displacement element and the bolt-like Haltedom a U-shaped executed connecting rod is arranged. The U-shaped connecting rod has two U-legs and a base bar. In the case of the outer gripping elements, it is advantageously provided that they engage with their gripping areas on the respective outer pouch seam, that is to say on the edges. The respective overreaching region of the respective outer gripping element projects beyond the edge of the bag. Of course, the overreaching area could also be designed with a suitably designed connecting rod for the relative mobility of the gripping area arranged thereon. For example, a straight-line connecting rod is possible. In the inner gripping element is advantageously provided that this engages with its gripping region on the inner seam and overlaps with its overreach at least one of the chambers. In this respect, it is advantageously provided that the respective U-shaped connecting rods are dimensioned differently in their axial extension of at least the U-legs, which means that the overlap region of the inner gripping element is made larger in its axial extent of the respective U-leg, as the two Overreach areas of the outer gripping elements; because the overreaching of the inner gripping element must surround at least one of the chambers.

In the starting position, the respective rigid gripping area is spaced relative to the movable gripping area (gap), so that the bag can be grasped by the gripping elements in the region of its head side, wherein the gripping elements, as already stated above, preferably at a common attack horizontal action line. For sufficiently positionally secure holding of the bag, the relatively movable gripping region is transferred in the direction of the rigid gripping region, so that the bag is securely clamped between the two gripping regions. This can be done with suitable facilities, which cause a displacement of the overreaching area with its Haltedom towards the rigid gripping area. Is the bag clamped between the gripping areas, the bag is suspended at its head by the gripping elements held with its bottom down.

To open the head side, the two outer gripping elements are now preferably moved or pivoted in the direction of the inner gripping element, so that the head side or the two geometrically differently designed chambers open sufficiently elliptically for filling.

The gripping elements have, in a preferred embodiment, two arm portions, of which at least one is rigidly attached as a mounting arm, for example, on a rotary, wherein a support arm can be mounted relatively movable to the mounting arm on this. In a favorable embodiment can be provided to connect the support arm of the inner gripping element rigidly with the mounting arm, since the inner gripping element preferably remains unchanged in its position, the respective holding arm of the respective outer gripping member can be movably attached to the mounting arm so that the support arm is pivotable relative to the mounting arm. This means that the two movable relative to the respective mounting arm retaining arms pivoted with their gripping end in the direction of the inner gripping element, or can be pivoted about an axis of rotation. As mentioned above, the two outer gripping elements can preferably be moved in opposite directions in the direction of the inner gripping element, that is to say in each case in opposite directions, in order to open the two chambers in their different configuration. For this purpose, the two outer gripping elements can be controlled via the adjustable lever system, wherein a motor control can be provided.

With the invention, a method and apparatus for opening a multi-chamber bag, or its differently sized chambers provided, which can be opened sufficiently despite their geometrically different configuration. For this purpose, preferably the outer gripping elements are transferred relative to the inner gripping element along the common horizontal line of action in the direction of the position-fixed inner gripping element in its final position. Of course, the gripping ends move on a circular path, whose radius is dimensioned so that there is virtually a linear movement. The travel paths are different and adjustable in their amount according to the size of the chamber. In the same way, the bag is on its head side after loading. closing process can be closed by the outer gripping elements are transferred back to their original position.

Further advantageous embodiments of the invention are disclosed in the subclaims and the following description of the figures. Show it

1 shows a double-chamber or duplex bag in a side view,

2 shows the double-chamber or duplex bag of Figure 1 in a plan view on the head side,

Fig. 3 shows the Doppelkammer- or duplex bag of Figure 1 with engaging gripping elements as a schematic diagram, Fig. 4, the Doppelkammer- or duplex bag of Figure 1 in one

5 shows a device for gripping and opening the multi-chamber bag in the starting position, FIG.

Fig. 6 shows the device of Figure 5 in an end position, and

Fig. 7 shows an inner gripping element as a detail.

In the different figures, the same parts are always provided with the same reference numerals, which is why they are usually described only once.

1 shows a multi-chamber bag 1 in the embodiment as a double-chamber or duplex bag 1. The multi-chamber bag 1 has two chambers 2, 3 for filling with a respective suitable filling material. The first chamber 2 is made larger in the illustrated embodiment than the second chamber 3. The first chamber 2 is left in the drawing plane and the second, smaller chamber 3 is shown in the drawing plane right.

Since both chambers 2 and 3 are different sizes, both chambers 2 and 3 also have different volumes.

The multi-chamber bag 1 is formed by way of example from a Hüllstoffbahn and has a bottom 4 and to an opposite side of the head 5 on. The two chambers 2 and 3 are sealingly separated from each other via an inner seam 6, wherein both chambers 2 and 3 are connected to each other via the inner seam 6 are. The inner seam 6 is based on a central axis X of the multi-chamber bag 1 side, arranged in the present embodiment in the drawing plane right to this. At the edge regions 7 and 8, the chambers 2 and 3 are closed to the side. The edge region 7 is arranged as a first edge region 7 on the first chamber 2. The edge region 8 is arranged as a second edge region 8 on the second chamber 3. The edge regions 7 and 8 extend from the bottom 4 to the top 5.

In the region of the head side 5 7 and 8 each bag gripper 9 are arranged at the edge regions. The bag grippers 9 are arranged by way of example with respect to the bottom 4 in an upper third of the multi-chamber bag 1.

FIG. 2 shows a plan view of the head side 5 of the multi-chamber bag 1, wherein the multi-chamber bag 1 has not yet been opened from its head side 5 for filling.

To open the multi-chamber bag 1 whose head side 5 is opened by advantageously at least one inner gripping element 10 and two outer gripping elements 11 and 12 are provided (Figure 3).

The inner gripping element 10 engages the inner seam 6. The outer gripping element 11 is in contact with the first edge region 7, and is referred to below as the first outer gripping element 11. The outer gripping element 12 is in contact with the second edge region 8, and is referred to below as the second outer gripping element 12.

All three gripping elements 10, 11 and 12 engage on a common horizontal line Y in their in Fig. 3 unrecognizable starting position. The common line of attack Y or also the line of action Y is arranged as an example at the level of the bag gripper 9 extending centrally through it. The gripping elements 10, 11 and 12 are associated with a pouch-processing machine, which fills the multi-chamber bag 1, or its different sized chambers 2 and 3 with a suitable filling material. The gripper elements 10, 11 and 12 are designed, for example, as gripper elements of a round, oval or longitudinal rotor machine.

To open the multi-chamber bag 1 or its two chambers 2 and 3, the first outer gripping element 11 in the horizontal direction along the line of action Y. relative to the inner gripping element 10 in the direction of this until the first outer gripping element 11 has reached its end position 13 shown in FIG. Preferably, at the same time, the second outer gripping element 12 is transferred in the horizontal direction along the line of action Y relative to the inner gripping element 10 in the direction of this until the second outer gripping element 12 has reached its end position 14 shown in FIG. The Innengreifgreifelement 10 is fixed in position, so held immutable in its position.

According to the different sized configurations of the chambers 2 and 3, both travels or upsetting paths of the two outer gripping elements 11 and 13 different amounts, which is exemplified with the horizontally oriented arrows 15 and 16. The upsetting path of the first outer gripping element 11, like the arrow 15, is larger than the upsetting path of the second outer gripping element 12, as the arrow 16 is intended to illustrate by way of example.

In the transfer of the outer gripping elements 11 and 12 in their exemplary end position 13 and 14, the two chambers 2 and 3 open elliptically, as shown by way of example in Figure 4. In this case, the chamber 2 opens according to the larger volume compared to the chamber 3 more than this, which is shown by way of example by means of the arrows 17 and 18. The arrows 17 represent the opening amount of the chamber 2, and are made larger than the arrows 18, which should represent the opening amount of the chamber 3.

In the figures 5 and 6, a device for gripping, opening and closing of the multi-chamber bag 1 is shown by way of example. FIG. 7 shows the inner gripping element 10 as a detail.

The multi-chamber bag 1 is shown in a view from the head side 5.

The gripper elements 10, 11 and 12 each have two arm sections 19 and 20. The respective arm portion 19 is rigidly connected as a mounting arm 19, for example, with a rotary. The arm portion 20 is connected as a holding arm 20 with the mounting arm 19. As shown, the support arm 20 of the inner gripping member 10 is rigidly connected to the mounting arm 19, with a center axis of the support arm 20 being offset laterally, for example, to a central axis of the mounting arm 19. The respective retaining arms 20 of the respective outer gripping element 11 and 12 are relatively movable to the mounting arm 19 respectively connected to this, that the relatively movable support arms 20 can be pivoted in each case in the direction of the inner gripping element 10 to this. In Figure 5, the gripping elements 10, 11 and 12 are shown in their initial position 21, wherein in Figure 6, the respective end position 13 and 14 of the outer gripping elements 11 and 12 is shown.

In a favorable embodiment, it can be provided that the two relatively movable outer gripping elements 11 and 12 and the retaining arms 20 are articulated by means of adjustable Hebelarmverhältnis at a central pivot point on which a cam roller engages, so that the two outer gripping elements 11 and 12 and whose retaining arms 20 can be controlled in their travel. This is indicated by means of the respective dashed outline 31 in Figures 5 and 6. Advantageously, a simultaneous opening of the different sized chambers 2 and 3 can thus be achieved with a single curved path.

When pivoting from the respective starting position 21 in the respective end position 13 and 14, the respective gripping end 22 of the respective outer gripping element 11 and 12 moves along the common horizontal line of action Y in the direction of the inner gripping element 10, so that the two Chambers 2 and 3 corresponding to opening, as shown in Figure 6.

For sufficiently positionally secure holding of the multi-chamber bag 1 in the device or by means of the three gripper elements 10, 11 and 12, these have at their gripping end 22 a rigid gripping area 23 and a gripping area 24 movably mounted relative to this, so that the gripping end 22 is executed quasi pliers-like. The rigid gripping area 23 is arranged directly on the respective holding arm 20. The movable relative to this movable gripping region 24 is arranged on an overreaching region 25, which has a displacement element 26 and a bolt-like retaining dome 27, wherein a U-shaped connecting rod 28 is arranged between the two. The connecting rod 28 has two U-legs 29 and a base web 30. With the displacement element 26 of the bolt-like Haltedom 27 is moved along the central axis of the support arm 20 in the direction of the rigid gripping portion 23 to clamp the bag 1 positionally secure. This movement can be done with suitable facilities. In Figure 7, this detail is more clearly visible, wherein the configuration of the overreaching area 25 to the respective outer and inner gripping element 10, 11 and 12 is basically the same. Only the configuration of the U-shaped connecting rod 28 with its U-legs 29 in its axial extent is different.

As shown (Figures 5 and 6), the U-legs 29 of the respective overreaching area 25 of the respective outer gripping element 11 and 12 are designed smaller in their axial extent than the overreaching area 25 and its U-leg 29 of the Inngreifelementes 10. Dies is advantageous in that the overreaching region 25 of the inner gripping element 10 engages by way of example the chamber 3 on the right in the plane of the drawing, so that it can be opened without hindrance by a method of the outer gripping element 12 along the line of action Y.

For gripping the bag 1, the gripping elements 10, 11 and 12 engage the inner seam 6 or at the edges 7 and 8 so that the bag 1 is mounted with its head side 5 in this. For secure holding, the gripping regions 25 move with their retaining dome 27 in the direction of the rigid gripping region 23, thus jamming the bag 1 in the gripper elements 10, 11 and 12. The two outer gripping elements 11 and 12 or their holding arms 20 are opened but at the same time, in opposite directions, it pivots in the direction of the inner gripping element 10 in such a way that both chambers 2 and 3 open at least sufficiently on the head side. If the bag 1 or its chambers 2 and 3 are filled with the respectively provided filling material, the outer gripping elements 11 and 12 are again transferred to their starting position, so that the head side 5 can be closed without creases.

LIST OF REFERENCE NUMBERS

1 bag / multi-chamber bag

2 chamber

3 chamber

4 floor

5 head side

6 inseam

7 edge area

8 border area

9 bag grippers

10 inner gripping element

11 outer gripping element

12 outer gripping element

13 end position

14 end position

15 travel path

16 travel path

17 Opening amount

18 opening amount

19 Fastening low arm

20 holding arm

21 starting position

22 grasping

23 rigid gripping area

24 relatively movable gripping area

25 Overreach area

26 sliding element

27 Haltedom

28 connecting rod

29 U-thighs

30 base jetty

31 border

Claims

claims

1. A method for opening a bag to be filled (1), which has at least two chambers (2,3) of different geometry and or volume contents which are at least one inner seam (6) sealingly separated and interconnected, characterized in that at least an inner gripping element (10) acts on the inner seam (6), wherein in each case an outer gripping element (11, 12) engages in each case in an initial position (21) at an edge region (7, 8), wherein at least two of the gripping elements (10, 11, 12) relative to a position-fixed (10,11, 12) gripping element in a respective end position (13,14) are moved, wherein the travel paths (15,16) of the relatively movable gripping elements (10,11, 12) have different amounts.

2. The method according to claim 1, characterized in that the travel paths (15,16) of the relatively movable gripping elements (10,11, 12) by means of an adjustable to the respective chamber geometry lever system have different amounts.

3. The method according to claim 1 or 2, characterized in that the two outer gripping elements (11, 12) are transferred relative to the inner gripping element (10) in the end position (13,14), wherein the two outer gripping elements (11, 12) oriented opposite in Direction to the inner gripping element (10) are moved.

4. The method according to any one of the preceding claims, characterized in that the inner gripping element (10) is held fixed in position in position, when the two outer gripping elements (11, 12) are transferred to their final position (13,14).

5. The method according to any one of the preceding claims, characterized in that the two outer gripping elements (11, 12) and the inner gripping element (10) on a common horizontal plane or action line (Y) of the bag (1) attack.

6. The method according to any one of the preceding claims, characterized in that the two outer gripping elements (11, 12) are articulated at a common pivot point, so that the outer gripping elements in their travel (15,16) are controlled.

7. Device for opening a bag to be filled (1), which has at least two chambers (2,3) of different geometry, which are at least one inner seam (6) sealingly separated and interconnected, in particular for the method according to one of the preceding Claims characterized by

Gripping elements (10,11, 12) wherein at least one inner gripping element (10) engages the inner seam (6), and wherein in each case an outer gripping element (11, 12) engages in each case in an initial position (21) at an edge region (7,8) in which at least two of the gripper elements (10, 11, 12) are moved relative to a position-fixed (10, 11, 12) gripper element into a respective end position (13, 14), the travel paths (15, 16) of the relatively movable gripper elements (15, 16) 10, 11, 12) have different amounts.

8. The device according to claim 7, characterized in that the gripping elements (10,11, 12) have opposing and zusammenführbare gripping regions (23,24), wherein at least one of the gripping regions (24) on a U-shaped overreaching region (25). is arranged, wherein one of the gripping regions (24) relative to the other gripping region (23) is designed to be movable.

9. Apparatus according to claim 7 or 8, characterized in that the gripping elements (10,11, 12) at its gripping end (22) have a rigid gripping area (23) and a relative to this movable gripping area (24), which via a connecting rod (28) which is U-shaped with U-legs (29) and a base web (30) are connected to each other.

10. Device according to one of claims 7 to 9, characterized in that the gripping elements (10,11, 12) have a fastening arm (19) and a holding arm (20), wherein the holding arm (20) of the outer gripping arm (20). is articulated elements (11, 12) on the respective mounting arm (19).