EP1166902B1 - Device for cleaning crates - Google Patents

Abstract

The machine for cleaning of bottle crates has conveyor belts (9-11) defining a chamber (4) in which the crates are washed. There are guides (17,17A) for the crates as they pass along a cleaning path in a set direction (A). The guides have an adjusting or raising drive (18,26,27) to vary their spacing from the feed conveyor plane (TE) for discharge of the crates.

Description

The invention relates to a device according to the preamble of claim 1.

Devices for cleaning boxes, especially crates are known. Specifically, a device is also known (DE 44 00 871 A1), in which the boxes to be cleaned are moved on a conveyor through the interior of a housing, at which the treatment of the boxes with different aqueous treatment or cleaning media takes place and the u.a. is formed by horizontal conveying or transport routes, which are connected to each other via turning or upward conveyors in the form of jaw conveyors.

The object of the invention is to show a device for cleaning boxes, which allows an intensive cleaning of boxes of different sizes possible. To solve this problem, a device according to the patent claim 1 is formed.

The invention allows i.a. in a particularly simple manner, an adaptation of the device or its conveyor to boxes of different size and / or height. In the device according to the invention various designs are conceivable.

For example, e.g. at least one arranged above the transport plane, in the transport direction (A) extending guide element for the boxes provided on a side facing away from the transport plane, with a first adjusting or lifting device, with adjusting the height of the distance, the guide element of the Transport level is adjustable, preferably from the outside of the housing forth.

In a further embodiment of the invention, the upward or reversing conveyor is provided in advance in the conveying direction of the at least one transport path, in wherein the boxes are turned about an axis parallel to the transport plane and perpendicular to the conveying direction, wherein at the transition between the upward conveyor and the transport path, a box guide (32) is provided which at least one, for example, formed by at least one slide rail sliding element for the transport plane facing Formed side of the boxes, slide over the boxes from the upward conveyor to the transport plane of the transport path and which extends with one end at least to an exit of the upward conveyor and is arranged at another end in the region of the transport path, and wherein the sliding member at one end is adjustable by a second adjustment relative to the transport plane.

In a further embodiment of the invention, at least two transport or conveyor lines are formed in the housing, which are interconnected via an up or turning conveyor formed by a jaw conveyor whose conveying width is variable by adjusting the distance between the two elements of the respective jaw conveyor, wherein a third adjusting device is provided, with the lateral guide railings at least one of the conveyor lines with the elements of the jaw conveyor are adjustable.

Fig. 1

in vereinfachter schematischer Darstellung und im Längsschnitt eine Flaschenkasten-Reinigungsmaschine gemäß der Erfindung;

Fig. 2

in vergrößerter Teildarstellung eine in der Höhe einstellbare und als Niederhalter dienende obere Führungsschiene;

Fig. 3

in vergrößerter Darstellung einen Schnitt entsprechend der Linie I - I der Figur 2;

Fig. 4

im Detail und in Seitenansicht eine der Umlenkrollen einer Verstellvorrichtung für den Niederhalter der Figur 2;

Fig. 5

in Teildarstellung das obere Ende eines der beiden Wende- oder Aufwärtsförderer, zusammen mit einer einstellbaren unteren Kastenführung am Übergang zwischen dem Wende- oder Aufwärtsförderer und der anschließenden horizontalen Förderstrecke;

Fig. 6

einen Schnitt entsprechend der Linie II - II der Figur 5;

Fig. 7

in Teildarstellung eines der beiden einstellbaren seitlichen Führungsgeländer einer horizontalen Förderstrecke der Reinigungsmaschine der Figur 1.

Further developments of the invention are the subject of the dependent claims. The invention will be explained in more detail below with reference to the figures of embodiments. Show it:

Fig. 1

in a simplified schematic representation and in longitudinal section of a bottle crate cleaning machine according to the invention;

Fig. 2

in an enlarged partial view, a height-adjustable and serving as hold-down upper guide rail;

Fig. 3

in an enlarged view, a section along the line I - I of Figure 2;

Fig. 4

in detail and in side view, one of the deflection rollers of an adjusting device for the hold-down of Figure 2;

Fig. 5

in partial view, the upper end of one of the two turning or upward conveyor, together with an adjustable lower box guide at the transition between the turning or upward conveyor and the subsequent horizontal conveyor line;

Fig. 6

a section along the line II - II of Figure 5;

Fig. 7

in a partial view of one of the two adjustable lateral guide railings of a horizontal conveyor line of the cleaning machine of Figure 1.

The cleaning machine shown in the figures and designated generally by 1 is used to clean boxes 2 and 2a, respectively, which are intended to receive containers, for example bottles (box 2) or cans (box 2a). The machine 1 consists essentially of an elongated or cuboidal housing 3, which encloses an interior or treatment chamber 4, in which the necessary for washing and cleaning the boxes 2 and 2a functional elements and units (in particular immersion bath and spray nozzles) are housed. The interior 4 is, for example, by not shown, provided on a longitudinal side of the housing 3 large, ie. man-high doors with large windows accessible through which the operation of the machine 1 is easily and clearly monitored.

Between one on the left in Figure 1 end face 5 of the housing 3 in the lower region provided in the box inlet 6 and on the in this figure at the right end 7 in the upper area provided box outlet 8 in the illustrated embodiment, a single-lane conveyor is formed on the the boxes 2 or 2a to be cleaned are moved past the interior 4 and past the treatment or washing elements formed on the conveyor.

As further illustrated in FIG. 1, this conveying device consists essentially of three horizontal conveying sections 9 - 11, which are stacked one above the other in the vertical direction and on which the boxes move in the conveying direction A. are and of which the lowermost conveyor line 9 is designed as an immersion bath, in which the boxes to be cleaned 2 and 2 are submerged in a cleaning liquid. The middle transport path 10 and the upper transport section 11 are each formed by independent, continuously circulating driven conveyor chains 12 (Figure 6), each with its upper, horizontal length form a footing for the boxes 2 and 2a and define the transport plane TE of the transport route ,

The conveyor sections 10 and 11 also have on the longitudinal sides in each case a lateral guide railing 13, which extends in the horizontal direction along the relevant transport path parallel to the conveying direction A. The conveyor belts 12 designed as hinge belt chains are each driven in such a way that the necessary conveying direction A for the boxes 2 or 2 a results, ie. in the representation selected for the figure 1 on the transport path 10 from right to left and on the transport path 11 from left to right.

Between the transport path 9 and the transport path 10 and the transport path 10 and the transport section 11, a respective turning or upward conveyor 14 and 15 is provided in which the boxes 2 and 2a are turned so that in the illustrated embodiment, the boxes standing on the floor of the box inlet 6 are supplied to the trained as an immersion bath transport path 9 in this orientation, then turned over the upward conveyor 14, ie lying with the box bottom lying on top of the transport section 10 and turned from there over the upward conveyor 15 again, again with the bottom lying down over the transport route 11 to the box outlet 9.

On the transport routes 10 and 11 and also on the upward conveyors 14 and 15, spray nozzles 16 for the respective washing or treatment liquid (water with cleaning additives and fresh water for rinsing etc.) are provided for the treatment of the boxes.

The up-feeders 14 and 15 are each formed as a jaw conveyor in which the boxes 2 and 2a are held laterally by clamping jaws which are provided on circumferentially driven and guided to frame or carriers 43 jaw bands 44 (Fig. 7). Such jaw conveyors are known in the art.

On the transport routes 10 and 11, but also on the transport path 9 is an upper, serving as hold-down guide rails (guide rail) 17 is provided, which is provided above the respective transport path in a transport direction A enclosing the vertical center plane M.

As also shown in Figure 1, the boxes 2 and 2a have different size and height, in the illustrated embodiment, the boxes 2 usual crates for holding beverage bottles and the boxes 2a made of a suitable material, for example made of plastic trays for receiving of cans are.

In order to be able to handle with the same machine boxes of different size or height, for example, the boxes 2 and 2a, and this to allow a quick conversion of the machine 1 from a box height to another box height, the guide railings 17 via an adjustment in the Height, ie adjustable in the vertical direction, as indicated in the figures with the double arrow B.

The adjustment device provided for this height adjustment is reproduced in more detail in FIGS. 2 and 3 and designated there generally by 18. For each guide rail 17, a separate adjusting device 18 is provided in the illustrated embodiment. This consists essentially of an upper, designed as a rod stroke rail 19, which formed in the illustrated embodiment of a C or U-profile and above the associated Guide rail 17 is arranged such that the open side of this profile downwards, ie in the direction of the guide rail 17 has. The lifting rail 19, which is arranged with its longitudinal extent parallel to the associated guide rail 17 and together with this in the center plane M, in the longitudinal direction, ie in the horizontal direction parallel to the conveying direction A by a predetermined stroke (double arrow C) displaced. For this purpose, a plurality of rollers 21 freely rotatably supported about axes perpendicular to the median plane M on a frame 20 of the housing 3, and on frame members 20 downwardly projecting flat arms 22. On these rollers 21, the rail 19 is located, between the arms 22nd and thus secured by this against lateral slipping.

On the adjustment or lifting rail 19 a plurality of chains formed as roller chains 23 are each attached with one end, in the illustrated embodiment at each adjustment 18 a total of three chains at equal intervals such that in each case a chain 23 in the region of each end of the rail 19 and the associated guide rail 17 and a chain 23 is located in the middle of the respective rail 19 and guide rail 17. Each chain 23 is held with its upper end between the legs of the U- or C-profile of the lifting rail 19 (attachment point 24) and guided over this attachment point 24 adjacent roller 21, so that each chain 23 via this roller 21 down hangs. Each chain 23 is further fixed at its lower end at 25 at the top of the associated guide rail 17.

As can be seen from FIG. 1, all the chains 23 of each lifting or adjusting device 18 each extend in the same direction over the roller 21 adjacent to its attachment point 24, in the case of the representation chosen for FIG. 1, starting from the upper attachment point 24 in the counterclockwise direction a fourth circumference of the associated roller 21. Furthermore, the arrangement is such that in the one end position of the stroke C, which corresponds to the lowermost position of the guide rail 17, the upper attachment point 24 is located on the roller 21 or in the immediate vicinity of this role, while in the other Extreme position of the stroke C, which corresponds to the upper position of the guide rail 17, the upper attachment point 24 of the associated roller 21 has a greater distance. In both cases, the respective chain 23 is guided over the associated roller 21.

The design of the lifting rail 19 as a C or U-profile and the attachment of the chains 23 in the interior of this profile have the advantage that the lifting rail 19 rests on the rollers 21 and the chains 23 are guided over the same rollers 21. Instead of the C-profile can be used for the lifting rails 19 and another profile, for example, a solid profile or a tubular profile with square or rectangular cross-section, which profile then each in the region of the rollers 21 with an open towards the bottom recess for the chains 23rd is provided such that in the region of the recess a U- or C-shaped cross-section is obtained. Furthermore, it is possible to provide the rollers 21 each with a circumferential groove for the chains 23, wherein the respective lifting rail then rests laterally from this groove on the roller.

Via a drive, for example via a cable 26, the respective lifting rail 19 can be moved in the direction of the double arrow C by turning on a provided on the outside of the housing 3 dial 27 and thus the height of the associated guide rail 17 can be adjusted. In the illustrated embodiment, a separate dial 27 is provided with associated drive or cable 26 for each adjustment 18. In principle, however, it is also possible to actuate all adjustment devices 18 via a common actuator, for example dial 27. Of course, this setting can also be done by motor, for example by an electric motor or another motor actuator or drive.

The guide rails 17 are in the illustrated embodiment, when the boxes 2 and 2a come to rest against these guide rails, with their mass weight against the boxes and consist in the illustrated Embodiment of a closed at the circumference hollow or tubular profile with square cross-section.

At least at the front end relative to the conveying direction A, a shorter guide rail 17a is articulated at each guide rail 17 with one end (joint 28) and hinged at the other end (joint 29) with one on the housing 3 or on a frame part 20 there provided bearing 30, in such a way that the longitudinal extent of the guide rail 17a of the common center plane M with the longitudinal extent of the associated guide rail 17 is located.

The hinge 28 is formed so as to allow pivoting between the guide rails 17 and 17a about an axis perpendicular to the median plane M. The hinge 29 formed on the bearing 30 is formed so that it allows pivoting about an axis perpendicular to the median plane M axis and at the same time also a radial displacement in the horizontal direction. In the illustrated embodiment, the hinge 29 is a pin-and-slot joint.

By the guide rails 17a is prevented on the one hand that bottle crates 2 or 2a could lock at the beginning of the respective guide rail 17 by possibly starting against the local end of this guide rail, ie by the guide rails 17a in the respective conveyor section 9, 10 and 11 incoming boxes 2 and 2a so reliably guided under the associated guide rail 17. At the same time stabilization of the associated guide rail 17 is achieved by the guide rails 17a, in particular against unwanted oscillation about an axis parallel to the conveying direction A. By the joints 28 and 29, despite the respective guide rail 17a, a height adjustment of the guide rail 17 in the manner described above possible. The guide rails 17a each consist of a tube profile with a square cross-section.

As shown in FIG. 1, the boxes 2, 2a, which may have a very different height, are transferred from the transport path 10 to the adjoining upward conveyor 15 in a positioning corresponding to the positioning of these boxes on the transport path 10, i. the boxes are arranged with their open side in the region of the upward conveyor 15 outboard with a radial distance from the central axis 31 of the semicircular trajectory of this upward conveyor which corresponds (radial distance) the distance that the transport or conveying plane of the transport path 10 from this central axis 31 has. However, the transport or conveying level of the overlying transport section 11 has a much smaller distance from the central axis 31, wherein the difference of these distances is slightly larger than the maximum height of the boxes to be processed.

In order to handle not only the boxes 2 greater height, but also the boxes 2a smaller height gently and quietly, an adjustable box guide 32 is provided at the transition between the upward conveyor 15 and the transport section 11 through which the boxes 2 and 2a with sliding on its underside onto the conveyor belt or onto the hinge belt 12 of the transport path 11 and via which a gentle and, in particular, low-noise transfer of boxes of smaller height, for example the boxes 2 a, is achieved.

At the transition between the upward conveyor 14 and the transport path 10 a deratige box guide 32 is not required in the illustrated embodiment, since it is assumed that the boxes 2 or 2a when passing through the formed as a dip bath transport path 9 in the local cleaning liquid and float over the local guide rail 17 are held with its open top at a level whose distance from the central axis 31 of the upward conveyor 14 is equal to or approximately equal to the distance that the transport plane of the transport path 10 from this central axis 31 has. Basically, there is the possibility, even at the transition between the Upward conveyor 14 and the transport path 10 to provide such a box guide 32.

The box guide 32 consists essentially of two sliding rails 33 each formed by a tubular profile, which are articulated at one end by means of a joint 34 to a frame 35 of the transport path 11, namely pivotable about a horizontal axis perpendicular to the center plane M and to the transport direction A. The frame 35 forms the guide for the hinge band 12 and the storage for the guide and deflection wheels of this chain.

The joints 34 of the two slides 33 are arranged coaxially. With their free, curved ends, the slide rails 33 extend into the upward conveyor 15. The slide rails 33 are provided on both sides of the hinge belt 12. Approximately in the middle of the two slide rails 33 are connected at the bottom via a transverse web 36, which is parallel to the axis of the joints 34 with its longitudinal extent. At the ends of the cross bar 36, a lever 38 is articulated by means of a joint 37 with one end, the other end is articulated by means of a hinge 39 to an arm 40 'of an angle lever 40. The angle lever 40 is articulated by means of a hinge 41 on a frame part 20 of the housing 3. The free end of the other arm 40 "of the angle lever 40 is connected via a tension member 42 with the lifting rail 19 of that adjusting device 18, with which the height adjustment of the guide rail 17 of the underlying transport path 10 takes place.

The lever 38 and the arms 40 'and 42 "of the angle lever 40 lie in a plane parallel to the median plane M. The joints 37, 39 and 41 lie with their axes of articulation perpendicular to this median plane Lifting rail 19 for the guide rail 17 of the transport path 10 in the sense of lowering this guide rail 17, the two slides 33 are pivoted about the joints 34 with their free ends up or at a lifting of the aforementioned guide rail 17 pivoting of the slide rails 33 down. Thus, depending on the setting of the guide rail 17 of the upward conveyor 15 preceding transport path 10 provided at the output of the upward conveyor 15 box guide 32 automatically adjusted properly to the height of the boxes 2 and 2a such that the distance between the free ends of the slide rails 33rd from the central axis 31 is approximately equal to or slightly larger than the distance with the displaced guide rail 17 of the Transprtstrecke 10 of the associated transport plane TE and thus within the upward conveyor 15 still held boxes before transfer to the transport section 11 with its bottom on the curved ends slide on the slide rails 33 and then gently and almost noiseless along the slide rails 33 reach the transport route 11.

The setting of the box guide 32 thus takes place via the common adjusting element for the height adjustment of the guide rail 17 of the box guide 32 in the transport direction A preceding transport path 10th

In order to process boxes 2 and 2a, which have different width in the horizontal direction and transverse to the conveying direction A, it is common and known to adjust the conveying width of the upward conveyor 14 and 15, respectively by adjusting the two frame parts 43 of the respective Upward conveyor perpendicular and symmetrical to the median plane M. At the frame members 43 which form the jaws conveyor belts 44 are guided. This adjustment takes place via spindles 45 which can be actuated via a common drive, for example via a manual drive on the outside of the housing 3. To adjust the width of the conveyor belt width of the upward conveyor 14 and 15 at the same time a width adjustment of at least the transport routes 10 and 11 and To reach there guide railing 13, each guide railing 13 is connected at both ends via a lever assembly 46 to a frame member 43 drivingly connected.

The lever assembly 46 consists of a lever 47 which obliquely via the respective transport path 10 and 11 facing away from the outside of the guide railing 13 protrudes and is articulated at one end by means of a hinge 48 on the guide railing and at the other end by means of a hinge 49 on a frame part 20 of the housing 3. In the middle of the lever 47 is connected via a hinge 50 with one end of a control lever 51, the other end via a hinge 52 to the frame part 43 is pivotally connected. The hinge axes of the joints 48, 49, 50 and 52 are each vertical axes. When adjusting the conveying width of the upward conveyors 14 and 15 (double arrow D) is pivoted about the control lever 51 of the associated lever 47 for a width adjustment of the lateral guide railing 13. About several, the lever 47 corresponding lever 47 a, the guide railing 13 is supported between its two ends in the housing 3.

Like the other, provided in the interior 4 functional elements, in particular the guide rails 17, 17a and the elements of the adjusting device 18, the box guide 32 and the elements of the lever assemblies 46 made of corrosion-resistant material, preferably made of stainless steel or corrosion-resistant steel. The rollers 21 of the adjusting devices 18 are preferably made of a suitable plastic.

The invention has been described above by means of an embodiment. It is understood that numerous changes and modifications are possible without thereby departing from the inventive idea underlying the invention.

LIST OF REFERENCE NUMBERS

1

Cleaning or washing machine

2, 2a

box

3

casing

4

inner space

5

front

6

box inlet

7

front

8th

box outlet

9, 10, 11

transport distance

12

Conveyor belt or hinge belt chain

13

guide railings

14, 15

upward conveyor

16

nozzle

17, 17a

guide rail

18

Adjustment or lifting device

19

lifting rail

20

frame element

21

role

22

poor

23

Chain

24, 25

attachment point

26

rope

27

dial

28, 29

joint

30

camp

31

central axis

32

box guide

33

slide

34

joint

35

frame

36

crossmember

37

joint

38

lever

39

joint

40

bell crank

40 ', 40 "

poor

41

joint

42

tension member

43

frame

44

Transport or jaw band

45

adjusting spindle

46

lever assembly

47, 47a

lever

48, 49, 50

joint

51

control lever

52

joint

A

conveying direction

B, C, D

double arrow

M

midplane

TE

transport plane

Claims (13)

1. Device for cleaning crates (2, 2a), particularly those for bottles, cans or similar containers with at least one conveyor section (, 10, 11) formed in an inner or treatment area (4) on which the crates (2, 2a) are moved on a conveying plane (TE) in a conveying direction (A) for treatment with a liquid cleaning medium, at least one upward or reversing conveyor (15) being provided in which the crates (2, 2a) are reversed about an axis (31) parallel to the conveying plane (TE) and perpendicular to the conveying direction (A), characterized in that at least part of the conveying section (9, 10, 11) is adjustable as regards height and/or width and/or height level.
2. Device according to claim 1, characterized by at least one guide element (17, 17a) for crates (2, 2a) extending in conveying direction (A) and positioned over the conveying plane on a side remote from said conveying plane, as well as a first adjusting or lifting device (18, 26, 27) permitting the adjustment of the spacing from the conveying plane (TE) of the guide element (17) e.g. formed by a guide rail, preferably from the outside of casing (3).
3. Device according to claim 1 or 2, characterized in that in the conveying direction (A) upstream of the at least one conveying section (11) is provided the upward or reversing conveyor (15), that at the transition between the upward conveyor (15) and the conveying section (11) is provided a crate guide (32), which has at least one sliding element, e.g. formed by at least one slide rail (33), for the side of the crates (2, 2a) facing the conveying plane and by means of which the crates (2, 2a) slide from the upward conveyor (15) onto the conveying plane (TE) of conveying section (11) and which extends with one end at least up to an outlet of the upward conveyor (15) and is positioned with the other end in the vicinity of the conveying section, and that the sliding element can be adjusted at its one end with respect to the conveying plane by a second adjusting device (38, 40).
4. Device according to one of the preceding claims, characterized in that at least two conveying sections (9, 10, 11) are formed in casing (3) and are interconnected by means of an upward or reversing conveyor (14, 15) formed by a clamping jaw conveyor and whose conveying width can be modified by adjusting the spacing of the two elements (43, 44) of the given clamping jaw conveyor (14, 15) and that a third adjusting device (46) is provided with which it is possible to adjust lateral guide rails (13) of at least one of the conveying sections (10, 11) with the elements of the clamping jaw conveyor (33, 34).
5. Device according to one of the preceding claims, characterized in that the adjusting or lifting device (18) has at least one lifting or pushing element constructed e.g. as a rail (19) and which extends on the side of guide element (17) remote from the conveying plane, that the guide element (17) is held on the lifting element (19) by means of at least one connecting member (23) formed by a chain, belt, cable, band or the like, that the connecting member (23) is guided by means of at least one guide element provided in casing (3) or on a frame element (20), e.g. by means of at least one pulley (21), in such a way that during the movement of the lifting element (19) in the longitudinal direction relative to the at least one return element (21) by means of connecting member (23) guide element (17) is adjusted relative to the conveying plane, the lifting element (19) being movable e.g. in an axial direction parallel to the conveying direction (A) for adjusting guide element (17, 17a) and/or in which e.g. at least two connecting members (23) are held by one end on lifting element (19) and fixed by their other end to guide element (17) and whereof each connecting member (23) is guided by means of at least one return element (21) not moved together with the lifting element (19).
6. Device according to one of the preceding claims, characterized in that in the vicinity of each end of the guide element (17) is provided a connecting member (23) acting on said guide element.
7. Device according to one of the preceding claims, characterized in that the lifting element (19) rests on the at least one return element (21).
8. Device according to one of the preceding claims, characterized in that the lifting element (19), at least in the area in which it rests on return element (21) over its adjusting stroke, has a recess which is at least open to said return element (21) and within which is fixed one end of connecting member (23) and/or that the lifting element (19) has a U or C-shaped cross-section and/or that the at least one return element (21) has at least one recess, e.g. a slot-shaped recess for receiving the connecting member (23) and outside the recess at least one bearing surface for lifting element (19).
9. Device according to one of preceding claims, characterized in that the at least one conveying section (9, 10, 11) is a horizontal or approximately horizontal conveying section.
10. Device according to one of the preceding claims, characterized in that at its one end the sliding element (33) is adjustable by the second adjusting device (38, 40) at least in one axial direction perpendicular to the conveying plane with respect to the latter and/or that the sliding element (33) is pivotably held at its other end about an axis perpendicular to the conveying direction (A) and parallel to the conveying plane.
11. Device according to one of the preceding claims, characterized in that in the conveying direction (A), upstream of the upward or reversing conveyor (15), are provided at least one first conveying section (10) and, following the upward or reversing conveyor (15) in conveying direction (A), at least one second conveying section (11), and that the adjusting device (10) for the guide element (17, 17a) of the first conveying section (10) is drive-connected with the adjusting device (38, 40) for the crate guide (32), which forms the transition between the outlet of the upward or reversing conveyor (15) and the second conveying section (11).
12. Device according to one of the preceding claims, characterized in that the third adjusting device is formed by a lever arrangement (46), which e.g. comprises a first lever (47) projecting obliquely over the outside of the guide rail (13) and which at one end is articulated to the guide rail and at the other end to the casing or a casing frame element (20), as well as a control lever (51) connecting the first lever (47) in articulated manner to a clamping jaw support frame (43).
13. Device according to one of the preceding claims, characterized in that the guide rail (13) is held by means of at least two first levers (47) in the casing or on casing frame elements (20).

Images