EP0644140B1 - Device and method for changing a foil strip roll and foil holding clamp - Google Patents

Abstract

What is described is, in the first place, a device for changing foil rolls, especially for pallet winders, with a foil-unrolling device (12) which has a spindle (16) for mounting the foil roll (17) having a tube core (18) and onto which the foil roll (17, 38) can be attached and from which the empty tube core (18) can be removed. It is distinguished by a foil-roll transporter (14) which can be positioned relative to the foil-unrolling device and which is intended for transporting the foil rolls (38) between a collecting/supply station (15) and the foil-unrolling device (12), which foil-roll transporter has a tube-core receiver (30) for the first (spent) foil roll (17) and a foil-roll holder (31) for the second (new) foil roll (38) and a spindle retraction device (28), and, in the second place, a method for operating such a device as well as, in the third place, a foil-holding clamp (32) for this purpose. <IMAGE>

Description

The invention relates to a device for changing Foil rolls, especially for pallet wrappers, with a Foil unwinding device that has a mandrel for storing the has a sleeve core having film roll on the the film roll attachable and of which the empty core is removable.

Pallet wrappers are used for stacking on pallets Good to pack as much as possible by machine. Doing so a film unwound from a film roll and for example in different types of banding around what is to be packed Well wrapped. Pallet wrappers can be essentially in divide two classes. In the first system, the Pallet with the goods to be packed stationary in the pallet winder, while the one on a rotor arm Film roll moved around the packaging goods. The second The film roll is stationary on the system Pallet wrapper, where the pallet with the to be packed Well turns on a turntable of the pallet wrapper and the film pulls off the film roll into which wrapped the good. As a rule, the film unwinding device Height-adjustable or adjustable, so that the pallet load helically wrapped with the film can be. This is necessary because of the web width with usually about 500 mm smaller than the dimensions the pallet load is.

The disadvantage of both systems is that after consumption a film roll of the pallet wrapper over a longer one Period of time to replace a used film roll is stopped by a new film roll. During this downtime is operated by an operator of the core the used film roll removed from the bearing mandrel and put a new roll of film from a stock onto the Bearing mandrel attached. The start of the film for the new film roll is then used by the operator via different deflection rollers and / or brake rollers of the film unrolling device led to the goods to be packaged and fastened there or in clamped a retaining clip, which also the beginning of the film sticks during the normal working cycle. Only then can the pallet winder is put back into operation and with continue packing the pallet goods. These downtimes of the pallet winder for changing the film rolls as well as the manual change of film rolls increase the operating costs of the pallet wrapper considerably. Incorrect operation of the winder by the Operating personnel are not excluded.

Similar problems exist with all other devices, where foil or sheet material from Supply rolls are withdrawn and processed or used be, so that a new one again and again at intervals Roll of material provided and in unwinding positions must be brought.

EP-A-0 509 958 describes an apparatus and a method described for the transport of a roll of paper. The device on the one hand transports the paper roll from a first winding position in a second winding position, the Winding process is not interrupted. The transport device can also take out a full roll of paper a stock position to an intermediate position in which the paper roll is placed on a hub element. The Roll of paper on the hub member is then passed through the transport device brought into the first winding position. On the Reverse path can be an empty roll of paper from the second Winding position over the intermediate position in a storage position to be brought. The axis of rotation of the paper roll is during all transport steps and in the winding positions horizontally aligned. For transporting a roll of paper from the The transport device reaches into the intermediate position in the intermediate position with three gripping fingers into the paper roll. With extendable pins provided in the gripping fingers the paper roll is clamped on the three gripping fingers. The paper roll attached to the transport device in this way becomes brought to the first intermediate position and there on empty triangular hub element, on which the Paper roll is held after the extendable pins are in the gripper fingers have been withdrawn. The so on the hub element arranged paper roll can then in the first Transported winding position and over the hub element on the first winding axis are attached. For this, a Gripping rod of the transport device in the hub element introduced and connected to them via movable balls. By then pulling back the gripping bar, one becomes slidable rod retracted in the hub member, over which the hub element at the intermediate position in a Recess was kept. This will remove the hub element from the Intermediate position solved. The so over the hub element on the Paper roll can then be set in the transport device first winding position are brought where they are in reverse Way is attached again over the rod of the hub member. In a comparable way, the gripping bar and the Hub element of the transport of the paper roll during the Winding process from the first winding position to the second Winding position and the transport of the empty paper roll the second winding position to the intermediate position in which the empty paper roll is detached from the hub element and over the three gripper fingers of the transport device into the storage position brought. Disadvantage of such a device and of such a method for transporting a roll of paper is that a large number of procedural steps are necessary is. There are two winding axes for unwinding the paper tapes necessary, which makes the device more expensive. They are also suitable the device shown and the method are not for Rolls of paper with wide tapes.

The invention has for its object a device for Changing film rolls or the like to create that only short downtimes of the pallet winder during the Film roll changes due and manual intervention during the film roll change largely unnecessary.

This task is accomplished by a device with the features of claim 1 solved.

In an advantageous further development, the roller reel transporter can also a film sealing device for producing a Weld point between the beginning of the film on the second film roll and the film end of the first film roll and a Cutting device for cutting the film end between the film seal and the first film roll.

A device with these features makes it practical fully automatic change of film rolls possible, the only comparatively short downtimes of the foils consuming machine requires.

A sensor first detects that on the Core of the existing and almost used film roll only a few layers of the film are left. By a appropriate control, the pallet winder is stopped, the Foil transporter with a new second foil roll to the The film unrolling device moved up, the beginning of the film second film roll with the film end of the first film roll if necessary welded automatically, if necessary the film end automatically between the film sealing point and the first film roll cut, the second film roll positioned on the mandrel and the core of the first film roll with the Film roll transporter to a collection / storage station transported. The film transporter takes you to the collection / storage station automatically a new second roll of film on and puts down the core of the used first film roll, whereupon the change process can be repeated.

According to an advantageous development of the invention The core of the core and the film roll holder are each as an arm of the film roll transporter arranged liftable and lowerable pin formed, which is an expandable for example, ring-shaped stretchable by means of compressed air Has cuff. Any other suitable tensioning device can be used. For gripping the film rolls the pin of the film roll holder is e.g. from above into the Inserted core and the cuff, for example Pressurized air stretched. The is released Roll of film after sorting from the roll of film by a corresponding automatic or supported Contraction of the cuff or similar clamping means.

So that the pin in the sleeve core before the expansion of the Cuff can be positioned centrally, are preferably on the spigot several protruding from the surface of the spigot, noses under spring tension circumferentially distributed.

According to a further feature of the invention, the mandrel retraction device an annular, stretchable cuff or the same clamping means, e.g. a square with one laterally protruding, spring-loaded ball catch, on that in a recess in a foot portion of the mandrel or can be positively received. Through this Design of the retraction device is simple and safe removal of the mandrel from the core of the first used film roll possible.

The mandrel retraction device with the clamping means is advantageous rotatable about its axis and thereby the mandrel on or from a film roll holder arm of the film unwinding device rotatable fixable or detachable.

The film roll is centered on the mandrel for example, ensures that the mandrel on one Foot portion is surrounded by a conical thickening and in a head portion protruding from the lateral surface of the mandrel, circumferentially distributed under spring tension Has noses.

According to another advantageous embodiment of the invention are the core sleeve holder and the mandrel retractor with respect a common axis vertically displaceable arranged on the film roll transporter. Thereby it is guaranteed that the core of the first film roll during the removal of the mandrel by the core extractor is securely fixed.

The film welding device has an advantage in particular retractable and extendable seal stamp, the one on the sealing roll stop arranged on the film unwinding device assigned.

This ensures a safe production of the film sealing point ensures that the sealing stamp during the film roll change and the seal stamp stop immediately lie adjacent opposite and between the two the film end the first film roll and the film start of the second Foil roll are arranged.

According to another advantageous feature of Invention, is a removable film holding clip on the second film roll with two protruding from the second film roll Spring arms can be fixed and between their two ends the unrolled film start of the second film roll can be fixed. The fact that the beginning of the film through the film holding clip fixed in a flag-like manner protruding from the second film roll the beginning of the second film roll and that Film end of the first film roll extremely easy during the Film roll change by moving the film roll transporter relative to the film unwinding device parallel to each other arranged and welded together.

The film holding clip advantageously has an interrupted one Spring washer, which is due to compression in the core of the sleeve Film roll is clamped, the spring arms of the Ends of the spring washer crossing over the film roll approximately radially or tangentially outwards from the film roll stand out. This makes it easy to attach the film holding clip on the core as well as a machine Remove the film clip from the core without further possible.

According to another development of the invention, the Foil bracket a substantially U-shaped bracket on, whose U-leg on the inner wall of the sleeve core and the outer surface of the second film roll can be clamped are, with the spring arms crossing each other like scissors protrude approximately tangentially outwards from the second film roll.

It has proven advantageous that the spring arms about 40 cm ± 10 cm from the center of the film roll one normal diameter up to about 30 cm extend outwards If so-called large rolls with a diameter of 50 cm or more are used is the use of Foil clips with longer spring arms required.

There is also an advantageous embodiment of the invention in that the spring arms starting from a first section for detachable fastening of the film holding clip to the second one Film roll in a second section and a fourth Section run essentially parallel to one another, in a middle third section cross each other and in a fifth section with gripping claws or the like Fixation of the beginning of the film are provided.

A simple way to release the beginning of the slide Foil clip and removal of the clip is that the film transport carriage has a gripper for actuating the film holding clip with which the Spring arms to release the beginning of the film and the The film holding clip is removable from the second film roll.

The gripper acts z. B. in a range between Spring washer or bracket and the crossing point on the Spring arms on. Are the spring arms in this area pressing the gripper together, the gripping claws move the spring arms apart, which is accompanied by the spring ring is compressed and the film holding clip easily can be removed from the core.

A simple construction of the cutting device is that it has holder arms pivotable about an axis of rotation, a hot wire is stretched between the free ends. Furthermore, it is u. U. advantageous instead of the hot Wire a mechanical cutter, e.g. B. with a blade operated by a linear cylinder.

The device according to the invention is advantageous controlled or actuated such that the film transporter with one attached to the second film roll holder second film roll, the beginning of the film using the film holding clip fixed from the second film roll is, so it lifts vertically and onto the film unwinding device moved horizontally that the sleeve core abnemer above the Positioned core of the first used roll of film is that you then lower the core holder, so that the core of the first roll of film and the second Film roll are at the same level, with the core of the core dipped in the core of the first film roll, that the core of the first roll of film on the core customer sets the mandrel retractor, the mandrel by means of the mandrel retraction device from the first Removed film roll that you then the film roll transporter moves horizontally until the second film roll above of the lowered mandrel is positioned and the beginning of the film and Film end adjacent at least approximately parallel to each other lie that you can manufacture the film sealer a weld between the beginning of the second film Film roll and film end of the first film roll actuated, by means of the cutting device between the film end cut the weld and the first roll of film Mandrel by means of the mandrel retraction device in the core introduces the second film roll by means of a gripper Film holding clip first opens and then from the second film roll lifts, the film roll holder second film roll releases that one the film roll transporter lifts vertically and horizontally towards the collection / storage station moved back that the second film roll holder to lie above the next second film roll comes and the core of the core is the core of the first Release the film roll and the gripper the film holding clip, and that you lower the film transporter and the second Film roll to the second film roll holder for a new film roll change. This allows z. B. a pallet winder also when changing film rolls largely without operating personnel operate short downtimes. It just has to be made sure that film rolls in the collection / storage station are present in sufficient numbers, the film rolls with the film clip to fix the existing one Are equipped at the beginning of the film. The one from the film roll transporter film holder clips released in the collecting supply stations are collected in a container and again used. Likewise, the used core of the used film rolls collected and further recycling fed.

Fig. 1 a, b 2 a, b 3 a, b

eine schematische Darstellung der Folienrollenwechselvorrichtung in Seitenansicht und Draufsicht während verschiedener Phasen des Wechselvorganges nach einem Ausführungsbeispiel der Erfindung,

Fig. 4 a, b

eine vergrößerte Darstellung eines erfindungsgemäßen Folienrollenhalters in Seitenansicht,

Fig. 5 a - c

den Dorn und die Dornrückzugsvorrichtung in Seitenansicht während verschiedener Phasen des Wechselvorganges,

Fig. 5 d

eine Draufsicht auf den Dorn und den Folienrollenhalterarm,

Fig. 6 a, b

eine Draufsicht und eine Seitenansicht einer ersten Ausführungsform der Folienhalteklammer,

Fig. 7

eine zweite Ausführungsform der Folienhalteklammer in Draufsicht,

Fig. 8

eine dritte Ausführungsform der Folienhalteklammer in Draufsicht, und

Fig. 9

eine weitere Ausführungsform des Klemmelements in Draufsicht.

Show it:

Fig. 1 a, b 2 a, b 3 a, b

1 shows a schematic illustration of the film roll changing device in a side view and a top view during different phases of the changing process according to an embodiment of the invention,

4 a, b

an enlarged view of a film roll holder according to the invention in side view,

5 a - c

the mandrel and the mandrel retraction device in side view during different phases of the changing process,

Fig. 5 d

a plan view of the mandrel and the film roll holder arm,

Fig. 6 a, b

a plan view and a side view of a first embodiment of the film holding clip,

Fig. 7

a second embodiment of the film holding clip in plan view,

Fig. 8

a third embodiment of the film holding clip in plan view, and

Fig. 9

a further embodiment of the clamping element in plan view.

1 to 3 is a device in three working phases 10 for changing film rolls 17, 38 shown as they can be used with advantage, for example, for pallet wrappers finds. For changing a first one on the film unwinding device 12 stored film roll 17 or after their use up of the remaining core 18 against one second new film roll 38 is a carriage or carriage trained film roll transporter 14 between a collection / storage station 15 and the film unwinding device 12 can be positioned horizontally and vertically relative to the latter.

The film unrolling device 12 has a film roll holder arm 64, which carries a vertically arranged mandrel 16. The mandrel 16 serves to support the first film roll 17, whose core 18 can be placed on the mandrel 16 and by this is removable. On the film unwind device 12 are also a brake roller 24 and two deflection rollers 20, 22 are provided. The film of the first film roll 17 wraps around the brake roll 24 and the pulley 22. Between the two pulleys 20, 22 a sealing stamp stop 26 is arranged.

The height-adjustable film unrolling device 12 as Whole is z. B. either stationary in a pallet winder set up when the goods to be packaged on one of the film unrolling device 12 assigned rotary table positioned is, or on a rotor arm of a pallet winder housed, with the help of the film unwinder 12 subtracting the film web as a whole around what is to be packed Is moving around well. Towards the end of the film web the remaining core 18 with interruption of the winding process exchanged for a new film roll 38 will.

A film roll transporter 14 of a special type is used for this. The film roll transporter 14 carries one on an arm 48 Core removal unit 30 for the core 18 of the first film roll 17 on the film unwinding device 12 and one Foil roll holder 31 for the second film roll 38. A Retraction device 28 for the mandrel 16 is below the Sleeve core remover 30 on another arm of the film roll transporter 14 attached. The retractor 28 and the sleeve core taker 30 are common to one another geometric axis 33 against each other in the vertical direction slidable. Laterally offset from the film roll holder 31 the film roll transporter 14 carries a film welding device 39 with at least one, in particular two or several seal stamps arranged vertically one above the other 40, 42. Furthermore, one is on the film transporter 14 Cutting device 36 attached to an axis of rotation 35th spaced apart and pivotable with this Holder arms 37 has. Between the free ends of the holding arms 37 is a heatable wire for severing the Film end 44 of the first film roll 17 stretched. This will the cutting device 36 between the sleeve core remover 30 and the film roll holder 31 through onto the film end 44 pivoted.

On the arm 48 of the film roll transporter 14 is also a Arranged gripper 34, by means of which the spring arms 70, 72 a film holding clip 32 on the second film roll 38 are acted upon. The film holding clip 32 is on each new second film roll 38 placed. The beginning of the slide 46 is clamped between the head ends of the spring arms 70, 72, so that it is flag-like from the second film roll 38 protrudes.

The sleeve core taker 30 and the film roll holder 31 are 4a and 4b as vertical to the arm 48 pins 49 arranged at the bottom. One in the head area provided expandable, annular cuff 56 stretches radially disengages and jams when compressed air is applied the core 18 of the first film rolls 17 or the full Film roll 38 firmly. The pin 49 has in the upper section several protruding from its lateral surface 55 under spring tension standing noses 50, 52, 54. The noses 50, 52, 54 are arranged circumferentially distributed on the outer surface 55.

The mandrel retraction device 28 has according to FIGS. 5a to 5d an annular, stretchable cuff 66, which by a Recess 67 can be received in a foot section 57 of the mandrel 16 is. The cuff 66 is about a central axis rotatable and the mandrel 16 on the film roll holding arm 64 rotatable fixable or detachable. In the event that the occurring Forces can exceed certain values instead the stretchable cuff 66 also a positive connection provided between the mandrel and the mandrel retractor be. For this, a square can be provided which in a corresponding recess in the lower part of the Dorns intervenes. One side of the square points to the fixing an outstanding, spring-loaded ball catch of the mandrel on, which is similar to the holding means of a nut / ratchet connection is trained.

At the foot section 57, the mandrel 16 is of a conical Thickening 63 comprises and has in a head section 45 whose outer surface 65 outstanding, under spring tension standing, circumferentially distributed noses 58, 60, 62.

The film holding clip that can be plugged onto a full film roll 38 32 has according to a first embodiment according to FIG. 6a, b as a clamping element for clamping fixing on the film roll 38 on an interrupted spring ring 68. The spring arms 70, 72 extend from the ends of the spring washer 68 crossing each other approximately above the film roll 38 radially or tangentially to the film roll 38 to the outside.

According to a further embodiment according to FIG. 7, the Foil holding clip 32 as a clamping element essentially U-shaped bracket 90, the U-leg on the inner wall 89 of the sleeve core 18 and the outer surface 91 of the second Foil roll 38 can be clamped. The spring arms 70, 72 are roughly tangent crossing each other like scissors above the outwardly facing film roll 38.

Common to the two embodiments of the film holding clip 32 that this is a clamping element in a first section 74 for clamping attachment to the second film roll 38, on which the two spring arms are located laterally 70, 72 connect. The spring arms 70, 72 are a second Section 76 and in a fourth section 80 approximately parallel aligned to each other and intersect in one middle third section 78 at a crossing point 79 a front fifth portion 82 of the spring arms 70, 72 Gripping claws 84, 86 or the like for clamping the beginning of the film 46 of the second film roll 38 is provided.

According to the first embodiment, the spring arm 72 has one first turn 92 between the second section 76 and the third section 78, the spring arm 70 a first turn 96 between the third section 78 and the fourth section 80 and both spring arms 70, 72 each have a second turn 94, 98 between the fourth section 80 and the fifth Section 82.

The spring arms 70, 72 are vertically offset from one another on the Clamping element arranged. The gripping claws 84, 86 or the like are essentially directed downwards at right angles from the fifth section 82 of the spring arms 70, 72. With The spring arms 70 extend about 40 cm ± 10 cm in length, 72 outwards from the center of the second film roll 38.

The gripper 34 acts to actuate the film holding clamp 32 in an area 88 between the clamping element and the crossing point 79 on the spring arms 70, 72. By the action of the gripper 34 on the area 88 of the spring arms 70, 72 these are spread in the fifth section 82 and the Film start 46 of the second film roll 38 released. With the spread of the outer portions of the spring arms 70, 72 of the Foil holding clip 32 becomes spring ring 68 at the same time compressed and can therefore automatically before the start of winding by means of the gripper 34 from the sleeve core 18 of the second Foil roll 38 are pulled out.

8 are the spring arms 70, 72 aligned approximately parallel to one another and in one middle, third section 78 by means of a fixing device 100 connected. The fixation device 100 consists of a holding bracket arranged on a spring arm 72 102, on which the other spring arm 70 is fixed, rotatable or is pivotally attached. In the area of the second section 76, the spring arm 70 has a cut 104. The clamping element is designed as an interrupted spring ring 68.

A gripper 34 for actuating the film holding clamp 32 acts in an area 88 between the clamping element and the crossing point 79 or the fixation device 100 on the Spring arms 70, 72 a. By the action of the gripper 34 on the area 88 of the spring arms 70, 72 these are in the fifth Section 82 spread and the beginning of the film 46 of the second Film roll 38 released. With the spread of the outer Portions of the spring arms 70, 72 of the film holding bracket 32 the spring ring 68 is pressed together and can thereby independently before the start of winding by means of the gripper 34 pulled out of the core 18 of the second film roll 38 will.

According to the embodiment of FIG. 9, the clamping element also be designed as a circular disk 106, on the Circumferential wall section one or more spring-loaded balls 108 and, not shown in FIG. 4, the spring arms 70, 72 are arranged according to one of the exemplary embodiments.

The device 10 for changing the core 18 of the spent Film roll 17, 38 against a new film roll works as follows:

By means of a sensor on the film unrolling device 12 found that the first film roll 17 consumed and only there are still a few layers of film on the core 18. The film consumer, e.g. B. the Pallet winder stopped and if necessary the film unwinding device 12 in a basic position, in particular in the lower end position, hazards. The film end 44 of the first film roll 17 is therefore still wound on the core 18. In the Collection / storage station 15 are a number of new film rolls 38 z. B. on a conveyor belt ready by means of the film roll transporter 14 to the film unrolling device 12 to be transported. Each new film roll 38 is with a film holding clip 32 which the film start 46th clamped fixed, so that this over a length of about 30 cm from the film roll 38 protrudes like a flag. The film clip Depending on the embodiment, 32 is either by means of of the spring ring 68 in the sleeve core 18 or by means of Retaining bracket 90 on the inner wall 89 of the core 18 and the Fixed outer surface 91 of the film roll.

The film roll transport carriage 14 moves to a standby one new film roll 38 so that the film roll holder 31 over the core 18 of the new film roll 38 is positioned. Then you lower the film roll transporter 14 or the film roll holder 31 that the second Foil roll holder 31 is immersed in the core 18. After an expansion of the cuff 56, for example, by acting on it the same with compressed air is the new film roll 38 fixed to the film roll holder 38.

The film roll transporter 14 is subsequently up and moved in the direction of the film unrolling device 12 until the Core pickup 30 above the core 18 of the first used film roll 17 is positioned.

Then the sleeve core extractor 30 lowers and dips into the core 18 of the first film roll 17. The sleeve of the sleeve remover 30 is used to fix the The core 18 of the first film roll 17 is stretched. The almost empty core 18 of the first film roll 17 and the second Foil roll, 38 are now one after the other at the same height positioned. At the same time, the retraction device 28 raised and the cuff 66 into the recess 67 in the Foot portion 57 of the mandrel 16 inserted. After stretching the Cuff 66, for example by applying compressed air, and rotation of the retraction device in any case in the area the cuff 66 about its axis, the mandrel 16 of the film roll holding arm 64 released and down from the The core 18 of the first film roll 17 is pulled out while this is held from above by the sleeve core collector 30 becomes.

Then the film transporter 14 is moved so that the film roll holder 31 with the second film roll 38 is arranged above the lowered mandrel 16. The film start 46 of the second film roll 38 now runs almost parallel to the film end 44 of the first film roll 17. The film welding device 39 is actuated to produce a film welding point 47 between the film start 46 and the film end 44. For this purpose, the sealing stamps 40, 42 are moved in the direction of the sealing stamp stop 26 and weld the film start 46 and the film end 44 to one another. The cutting device 36 is then pivoted about the axis of rotation 35 and cuts through the film end 44 between the film welding point 47 and the first film roll 17.
During the cutting process, the film end 44 is held in a defined position by being in contact with the deflection roller 20. After severing the film end 44, the mandrel 16 is inserted into the sleeve core 18 of the second film roll 38 by lifting the retraction device 28 and the mandrel 16 is locked by rotating the sleeve 66 with the film roll holder arm 64.

The gripper 34 on the arm 48 opens the film holding clip 32 by exerting pressure in area 88 so that the spring arms 70, 72 are opened and release the beginning of the film 46. By lifting the film transporter 14 into the upper position the film holding clip 32 from the second film roll 38 away.

The film roll transporter 14 is again in the direction of Collection / storage station 15 moves and the film roll holder 31 over the core 18 of a further second film roll 38 positioned. The gripper 34 opens and gives the Foil holding clip 32 for inclusion in a collecting container free. The sleeve 56 of the sleeve core remover 30 is pulled together and gives the core 18 of the first foils roll 17 free for inclusion in another collection container.

After consumption of the second film roll 38 begins Control sequence of the film roll changing device from the front.

Reference symbol list:

10th

contraption

12th

Foil unwinding device

14

Foil roll transporter

15

Collection / storage station

16

mandrel

17th

first film roll (old)

18th

Core

20th

Pulley

22

Pulley

24th

Brake roller

26

Seal stamp stop

28

Retraction device

30th

Core extractor

31

Foil roll holder (for 38)

32

Foil clip

33

axis

34

Gripper

35

Axis of rotation

36

Cutting device

37

Holding arm

38

second film roll (new)

39

Foil sealing device

40

Seal stamp

42

Seal stamp

44

Slide end

45

Head section

46

Start of slide

47

Foil sealing point

48

poor

49

Cones

50-54

Noses (under spring preload)

55

Lateral surface

56

stretchable cuff

57

Foot section

58-62

Noses (under spring preload)

63

thickening

64

Film roll holding arm

65

Lateral surface

66

stretchable cuff

67

Recess

68

Spring washer

70

Spring arm

72

Spring arm

74

first section

76

second part

78

third section

79

Crossing point

80

fourth section

82

fifth section

84

Gripping claw

86

Gripping claw

88

Area

89

Interior wall

90

Bracket

91

Outer wall

92

first turn

94

second turn

96

first turn

98

second turn

100

Fixation device

102

Retaining tab

104

Severing

106

disc

108

Bullets

Claims (20)

1. Device (10) for changing foil rolls (17, 38), in particular for pallet wrappers, with a foil unwinding device (12) which has a vertical mandrel (16) to store the foil roll (17, 38) with a core (18), on which mandrel the foil roll (38) can be placed and from which the empty core (18) can be removed, with the foil roll transporter (14) positionable in relation to the foil unwinding device (12) for transporting the foil rolls (17, 38) between a collection/storage station (15) and the foil unroller device (12), which has a core holder (30) for the first consumed foil roll (17) and a foil roll holder (31) for the second new foil roll (38) and a mandrel retraction device (28) for the mandrel (16), where the core holder (30) and the foil holder (31) are each arranged suspended on an arm (48) of the foil roll transporter (14).
2. Device according to claim 1, characterised in that the foil roll transporter (14) has a foil welding device (39) to produce a weld joint (47) between the start of the foil (46) on the second foil roll (38) and the end of the foil (44) on the first foil roll (78), and a cutting device (36) to cut the foil end (44) between the foil weld joint (47) and the first foil roll (17).
3. Device according to claim 1 or 2, characterised in that the core holder (30) and the foil roll holder (31) are each formed as a spreadable annular sleeve (56) which can for example be expanded by means of compressed air, or as raisable and lowerable pegs with similar clamping means.
4. Device according to claim 3, characterised in that several lugs (50, 52, 54) under spring tension projecting from the generated surface (55) of the peg (49) are arranged on the peg (49) spread around its periphery.
5. Device according to any of claims 1 to 4, characterised in that the mandrel retraction device (28) has an annular, expandable sleeve (66) or similar clamping means, e.g. a square with a spring-loaded ball catch projecting at the side which can he held firmly by interference fit or by means of the projection in a recess (67) of a base section (57) of the mandrel (16).
6. Device according to claim 5, characterised in that the mandrel retraction device (28) can be fixed or released to rotate about a central shaft and hence the mandrel (16) can be fixed or released to rotate on or off a foil roll holder (64) of the foil unroller device (12).
7. Device according to any the previous claims, characterised in that the mandrel (16) is surrounded on the base section (57) by a conical thickening (63) and has lugs (58, 60, 62) spread around its periphery under spring tension and projecting from the generated surface (65) of the mandrel in a head section (45).
8. Device according to any of the previous claims, characterised in that the core holder (30) and the mandrel retraction device (28) are arranged on a common shaft (33) adjustable vertically in relation to each other on the foil roll transporter (14).
9. Device according to any of the previous claims, characterised in that the foil welding device (39) has a sealing stamp (40, 42) which can in particular be extended and retracted and to which is allocated a sealing stamp stop (26) arranged on the foil unrolling device (12).
10. Device according to any of the previous claims, characterised in that during a foil roll change, the sealing stamp (40, 42) and the sealing stamp stop (26) lie immediately adjacent opposite each other and between the two can be introduced the foil end (44) of the first foil roll (17) and the foil start (46) of the second foil roll (38).
11. Device according to any of the previous claims, characterised in that on the second foil roll (38) can be attached a removable foil holding clamp (32) with two spring arms (70, 72) projecting from the foil roller (38) and between the ends of the spring arms (70, 72) can be attached the unrolled foil start (46) of the second foil roll (38).
12. Device according to claim 11, characterised in that the foil holder clamp (32) has an interrupted spring ring (68) which can be clamped in the core (18) of the second foil roller (38), where the spring arms (70, 72) from the ends of the spring ring (68) cross each other above the second foil roll (38) and project approximately radially or tangentially to the outside of the second foil roll (38).
13. Device according to claim 11, characterised in that the foil holding clamp (32) has an essentially U-shaped retaining bracket (90), the legs of the U of which can be placed to clamp on the inner wall (89) of the core (18) and the outer surface (91) of the second foil roll (38), where the spring arms (70, 72) cross each other scissor-like and project approximately tangentially to the outside of the second foil roll (38) and between them clamp the foil start (46).
14. Device according to any of claims 11 to 13, characterised in that the spring arms (70, 72) extend outwards by approximately 40 cm ± 10 cm, where applicable by more, from the centre of the second foil roll (38).
15. Device according to any of claims 11 to 14, characterised in that the spring arms (70, 72), starting from a first section (74) for releasable fixing of the foil holding clamp (32) on the second foil roller (38) run essentially parallel to each other in a second section (76) and a fourth section (80), cross each other in a central third section (78) and in a fifth section (82) are fitted with gripper claws (84, 86) or similar to fix the foil start (46).
16. Device according to any of the previous claims, characterised in that the foil roll transporter (14) has a gripper (34) to activate the foil holding clamp (32) with which the spring arms (70, 72) of the foil holding clamp (32) can be opened to release the start of the foil (46) and the foil holding clamp (32) can be removed from the second foil roll (38).
17. Device according to claim 16, characterised in that the gripper (34) acts on the spring arms (70, 72) in an area (88) between the spring ring (68) or retaining bracket (90) and the crossing point (79).
18. Device according to any of the previous claims, characterised in that the cutting device (36) has retaining arms (37) swivellable about a common rotational axis (35), between the free ends of which is clamped a hot wire.
19. Device according to any of the previous claims, characterised in that the cutter device (36) is formed as a mechanical cutter device, in particular as a blade activated by a linear cylinder.
20. Process for operation of a device according to any of the previous claims, characterised in that the foil roll transporter (14) with a second foil roll (38) attached on a second foil roll holder (31), the foil start (46) of which is fixed at a distance from the second roll (38) by means of a foil holding clamp (32), is raised vertically and moved horizontally onto the foil unroller device (12) such that the core holder (30) is positioned above the core (18) of the first foil roll (17), that the core holder (30) is lowered so that the second foil roll (38) lies at the same level as the core (18) of the first foil roll (17), where the core holder (30) is inserted in the core (18) of the first foil roll (17), that the core (18) of the first foil roll (17) is fixed on the core remover (30), the retraction device (28) is raised, the mandrel (16) is withdrawn downwards by means of the mandrel retraction device (28) out of the core (18) of the first foil roll (17), that then the foil roll transporter (14) is moved horizontally until the second foil roll (38) is positioned above the lowered mandrel (16), and the foil start (46) and foil end (44) lie at least approximately parallel with each other, that a foil welding device (39) is activated to create a weld joint (47) between the foil start (46) and the foil end (44), the foil end (44) is cut by means of the cutting device (36) between the weld joint (47) and the first foil roll (17), the mandrel (16) is inserted in the core (18) of the second foil roll (38) by means of the mandrel retraction device (28), the foil holding clamp (32) is then opened by means of a gripper (34) and then removed from the second foil roll (38), where the second foil roll holder (31) releases the second foil roll (38), that the foil roll transporter (14) is raised vertically and moved horizontally in the direction of the collection/storage station (15) until the second foil roll holder (31) is positioned above the next second foil roll (38) and the core remover (30) releases the core (18) of the first foil roll (17) and the gripper (34) releases the foil holding clamp (32), and the foil roll transporter (14) is lowered and the second foil roll (38) attached to the second foil roll holder (31) in order to be ready for transport to the foil unwinding device (12).

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