DE3337365A1 - PLASTIC FILM WRAPPER WITH FLYING REEL CHANGE - Google Patents

Description

Dipl.-lng.Dr.-lng. HEINZ NICKELS - Dip! - Phys. LORENZ HANEWINKEL PATENT LAWYERS

Detmolder Strasse 26, 4800 Bielefeld 1 Diess. Ref .: B 123/1

Bastian Wickeltechnik GmbH Augustdorf er Strasse

4815 Holte-Stukenbrock Castle

"Plastic film winder with on-the-fly roll change"

The invention relates to a reel for plastic film with at least two reels roll at both ends in two turntables with the same distance from their pivot bearings, which are in the side walls of a frame are stored, are exchangeable and are connected to separately controllable drives and in which the turntables are connected to a further controllable drive and in which a pressure roller of the length of the reel rollers is parallel to them and is rotatably mounted so that it can be rotated so that it can be changed in position, that the film, which is wrapped over this with a wrap angle of approximately 180 °, in each case of the reel reel located in the working position or the respective reel located thereon is supplied with a predetermined Train is applied.

There are reels known, each with a winding on one Reel reel is created while the previously completed reel is removed from the device and replaced by an empty reel reel will. For this purpose, the two reel rollers are rotatably mounted in parallel turntables, driven by a motor, and the turntable is rotated further by 180 ° as soon as a winding is completed,

r- ^s -

so that the empty reel comes into working position and the full one Wrap can be removed. The film is then suddenly cut through with a cutting knife, and the beginning of the film is reversed the free reel roll is laid.

So that the film is wrapped tightly, it is over a pressure roller with approx. 180 ° wrap around the roll constantly under tension, and the pressure roller exerts a predetermined amount on the roll Pressure off. For this purpose, it is mounted on a controlled slide that moves from the side to the one in the working position Roll is advanced. Such a parallel slide guide and the associated parallel feed drive of the pressure roller is very expensive, because they because of the low thickness of the film of z. B. 20 microns and the width of the web of several meters very must be precise.

It is the object of the invention to disclose a substantial simplification of the mounting and the drive of the pressure roller.

The solution to the problem is that the pressure roller is mounted in a pivot arm which is mounted in pivot bearings below the turntables is mounted in the frame, and a deflection cylinder is rotatably mounted between the pivot bearings, around which the incoming film is guided on the pressure roller.

In the known reels, the bobbins are in working resp. Change position next to each other, and the filled bobbin is swapped into the change position via the semicircular path below. In contrast, the coil replacement of the full coil is carried out on the upper semicircular path, creating the pivot point the turntable can be lower by the distance of the winding axis, since the full winding is not rotated under this. This advantageously results in a reduction in the overall height of the device.

So that the bobbin exchange of the empty bobbin takes place on the lower track can, when the winding is full, the pressure roller is swiveled away from this so far that the empty bobbin is next to in the direction of rotation the pressure roller runs in when the turntables continue to turn. During the swivel movement and the subsequent swiveling back in the working position, which takes place evenly with the further turning of the full lap, the length of the free one does not yet remain wound film web practically unchanged at constant winding speed and constant film feed, which is advantageous the creation of firm, wrinkle-free wraps, especially the crucial initial layers, is achieved.

To facilitate the coil changing process, it is known a to swivel the automatically working cutting device after the reel exchange onto the film web so that the new film start above between the empty bobbin and the pressure roller when cutting ■ which arises and falls smoothly into it. For this purpose, the knife and other clamping cylinders were jointly from below between the full winding and the empty bobbin swung up and swiveled over this to get into the correct cutting position. The path of the Foüenbahn was disadvantageously extended considerably,

Y-

resulting in distortion of the slide, or it was a controlled one Braking of the full lap required while the cutting device is swiveling in. It also required the Distance of the full winding and the empty bobbin and corresponding to the bearings in the turntables to choose so large that the cutting device could be swiveled through between these, which in turn a larger overall arrangement and a stronger drive required at the turntables. These disadvantages are avoided by a new arrangement of the cutting device, which for itself and especially in connection with the lower pivot bearing of the pressure roller and the exchange of the lap on the upper web is inventive and consists in that the cutting device around one Pivot axis, which lies approximately to the side of a full roll in the working position, is pivotably mounted and connected to a drive is that they pivot controllably from an approximately vertical rest position from the top to the side into the approximately horizontal cutting position can. The clamping cylinder, which is in front of the knife in the direction of travel of the film, is then opposite the pressure roller next to the empty bobbin, and the other clamping cylinder lies behind the knife in the running direction with light pressure on the film. A film web extension occurs advantageous not on. The center distance of the coils is reduced and the turntables and the overall device are reduced accordingly.

The slight differences in the free path length are advantageously compensated by the fact that the cutting device and thus the clamping cylinder already during of the reel exchange is swiveled into the film web with light pressure and gradually moves into the cutting position.

Another advantageous embodiment of the pivot arm of the pressure roller as a two-part arm with counterweight stabilization and sensitive auxiliary drive is in the description based on the figures described.

The use of a pressure roller with internal cooling and drive by the cooling water is an advantageous further development of the device, because the cooling of the film immediately before winding prevents shrinkage in the roll and the turbine-like drive the roller provides an even pull of the film and apart from the cooling water hoses no swiveling, which require compensation, Drive means are required.

In Figures 1 to 3, an embodiment is shown in which all advantageous features are included. The replacement of individual assemblies by other known ones or a relocation of the swivel axes, in particular the cutting device with a corresponding design of the swivel, so that the working positions of the components involved in the respective functions are the same to one another, is possible without departing from the principle of the inventions.

As far as with similar arrangements, z. B. with three coils, such The geometry of the arrangement of the assemblies cannot be achieved without further ado, in which the free length of the film path hardly changes, a suitable choice of the gearbox of the reel drive can compensate for a specific reel diameter can be created by transferring an associated rotation to the spool from the rotation of the turntable.

Fig. 1 shows schematically a cross section through a reel in the position before cutting;

Fig. 2 shows a plan view of the reel according to Fig. 1,

Fig. 3 shows a special embodiment of the swivel arm of the And ruck ro He on a larger scale,

Fig. 4 shows a gear for a reel drive schematically.

In Fig. 1, a base frame 19 is shown, which at a distance of several Meters has two vertical parallel side walls 20, between which the coils 9, 10 for winding 12, 11 of the film 1

τ--

as well as the pressure roller 30, the deflecting cylinder 34 and the knife 54 and the clamping cylinder 51, 52 of the cutting device 50 are parallel extend towards each other.

In the side cheeks there are symmetrical rotating disks 61 for the bobbins Exchange stored in bearings 60 and connected to a controllable synchronous rotary drive. The coils 9, 10 are in these rotating disks 61 at the distance A from the bearing 60 exchangeably stored at both ends, so that in each case a full bobbin 11 is brought into the changing position, removed there and can be replaced by an empty one when winding on the other, whereby the film is uninterrupted when changing the spool is fed.

Furthermore, the frame 19 and the side cheeks 20 are supported on both sides the winding swivel arms 31, which carry a pressure roller 30 and whose swivel bearings 33 are located below the turntable 61. A deflecting cylinder 34 is located between the pivot bearings.

The swivel arm 31 is swiveled against the frame 19 via a drive 36 which is hydraulically controllable. Is there a empty bobbin 9 in the working position, the swivel arm is approximately vertically upwards, and the pressure roller 30 is approximately in the middle on the winding from the side from which the bobbin was swiveled in. If the roll is full, the pressure roller 30 pivots up to Coil size 12 ν sideways and downwards. The film 1 is fed from below the deflecting cylinder 34 and wraps around the pressure roller by approx. 180 ° and then passes over onto the spool with the reverse curvature. This is a uniform pull in tangential Direction and pressure at the point of contact are given, through which air inclusions are avoided.

3337355 ■ Μ-

If the roll 12 ν is full, the swivel drive 36 is relieved or vice versa, so that the pressure roller 30 comes into such a laterally lower position 30b that an empty one that has meanwhile been inserted Spool 10 happens when the turntable is turned to the right above the pressure roller 30 on web 71. Once this is done pivot the pivot arms 31 back again, the pressure roller 30 coming into contact with the empty bobbin. Overall done a rotation of the turntables 61 by 180 °, so that the full bobbin comes into position 11, as shown. The film web is thereby deflected around the empty bobbin. As soon as the film passes through the knife above the haunted area between the spool 9 and the pressure roller 30 is cut, the new beginning is wound around the spool and the full spool can be exchanged.

Only during the last revolutions is the pressure roller not in contact with the roll; however, the film 1 is always under tension, there the free length hardly changes when pivoting the pivot arms 31 and when rotating the turntable 61, since the pivot axis 33 is in the vicinity of the surface line of the full roll 12 ν and also due to the half rotation of the turntable 61 of the full When moving from position 12 ν to position 11, the winding experiences an additional rotation around its bobbin axis, as further below is explained. The pressure roller can be carried along and guided in a known manner in such a way that the path of the film web is not lengthened takes place during turning.

One is still automatic for the automatic bobbin change working cutting device provided. This is mounted in pivot bearings 57 on the side walls 20 with two pivot arms 50, between which the clamping cylinders 51, 52 and the knife 54 are located. The swivel arms 50 can be operated via a swivel drive 58 from an almost vertical position 50b, in which the clamping

linder 51,52 and the knife outside the path 70 of the full spool 12 ν when rotating the turntable 61 are brought into the horizontal working position 50a in which the knife 54 is is located above the gap between the empty spool 9 and the pressure roller 30 and the tensioning cylinder 52, which is in the film running direction before Knife 54 lies, rests on the empty spool 9 on the opposite side to the pressure roller and the tensioning cylinder 51, which runs in the direction of the film is behind the knife 54, on the film 1 between the full roll 11 and the empty spool 9 rests with light pressure. The knife 54 is connected to a further swivel arm 53 and via a knife drive 55 to the swivel arm 50 and is known in the art Way abruptly actuated when the film is to be separated. The pivoting process of the cutting device takes place advantageously from the time at which the outermost surface line of the full roll 12 ν when rotating the turntable 61 on the web 70 the Connection line of the pressure cylinder 52 with the pivot bearing 60 has passed. The pressure cylinder or cylinders 51, 52 then hold the film when turning further, additionally under tension. After the cutting process, the cutting device is swiveled back again. To the To increase the cutting force, a counter holder can be arranged above the pressure roller.

From Fig. 2 further details can be seen in plan, wherein the position of the cutting device before cutting is shown. The swivel arms and drives are from the cladding of the side walls 20 covered; they are constructed in a manner known to the person skilled in the art.

An advantageous embodiment of the swivel arm 31 is shown in FIG. 3 and the mounting of the pressure roller 30 and its pressure means are shown. The swivel arm 31 is via a hydraulic swivel

drive 36 connected to the frame 19, through which the pressure roller 30 is brought into approximately the required position. The pressure roller 30 is supported in the first pair of pivot arms 31 in bearings 32, but balanced by counterweights 39, in a second pair of pivot arms 38.

A position indicator M determines the position of the two pairs of swivel arms 31,38 determined to each other and reported to a control device and the swivel drive 36 is actuated by the control device, that in each case a predetermined relative position of the pivot arms 31,38 is held. Between the pivot arms 31,38 is located furthermore a controllable drive 40 which z. B. is a pneumatic drive via which a certain pressure force on the pressure roller 30 is transmitted, with which the winding is compressed. Only when swiveling out the pressure roller 30 to let it pass a new, empty bobbin is not given any pressure on the drive 40.

Another innovation is provided, the pressure roller 30 with cooling water -Connections 41 to be provided and they in the internal configuration to equip in a known manner with a turbine drive that drives in the direction of the film that the film is constantly with a certain, very low tension is wound.

The cooling of the film immediately before winding has under. Among other things, the advantage that the film, which has already passed cooling rolls before entering the reel, especially when it comes to thicker films, has a heated surface due to heat transport from the inside, and this heat with the high wrap of approx. ISO ^{0 is} almost completely removed.

In Fig. 4 the drive of one of the coils is shown and shown, that by suitable choice of the translation of the toothed belt pulleys an additional rotation can be added to the coil drive from the rotation of the turntable.

The toothed belt pulley is rotated according to the desired speed of rotation of the reel by a drive M1 (not shown). On the Toothed belt 91, the synchronously parallel coupled gear pair 92, 93 and the further toothed belt 94, this rotation acts on the toothed belt pulley 95 and thus transferred to the coil 9. The number of teeth on disks 90 and 95 or 92 and 93 is the same, provided that no further step-up or step-down is desired. The gear pair 92,93 is mounted on the axis of rotation of the turntable and the Wheel 95 with the reel axis on the turntable 61 itself. If the turntable 61 rotates by the drive D (not shown), so the spool maintains its speed of rotation through the drive M1, if the number of teeth on all disks is the same.

If, on the other hand, the gear pair 92.93 has a relatively smaller number of teeth, accordingly, an additional rotation is transmitted to the spool or vice versa with a relatively larger number of teeth. For a specific one Reel diameter, e.g. B. that of the coil 12 v, can thus be a complete Compensation of the free length of the film web can be achieved if an additional rotation of the turntable 61 by 180 ° The coil is rotated by 90 °. This is achieved with a tooth ratio of 2: 1 for the discs 95 to 92. A corresponding drive mechanism is provided for the second spool.

- blank page -

Claims (7)

Claims - - ■ ------- " j 1.) Reel for plastic film (l) with at least two reel rollers (9,10), both ends in two turntables (61) with the same distance (A) from their pivot bearings (62), which are in side cheeks (.20) of a frame (19) are stored, exchangeable are stored and are connected to separately controllable drives and in which the turntables (6l) with a further controllable drive are connected and in which a pressure roller (30) of the length of the reel rollers (9,10) parallel to these and so changeable, is rotatably mounted at both ends that the film (l), which over this with approx. 180 ° wrap angle in each case of the reel reel (9) in the working position or the one on it Roll (12) is fed, is applied with a predetermined tension, characterized in that the pressure roller (30) is mounted in a swivel arm (31) which is located below the turntables (61) in swivel bearings (33) in the frame (19) is mounted, and a deflection cylinder (34) is rotatably mounted between the pivot bearings (33) around which the incoming Foil (l) is guided onto the pressure roller (30). 2. Apparatus according to claim 1, characterized in that the bearing (33) of the pivot arm (31) is close to the The surface line of a full roll (12 v) is in the winding position and the swivel arm (31) is approximately vertical when it rests on an empty lap and is allowed to run in when the lap is full an empty reel reel (9) by a swivel drive (36) between the swivel arm (31) and the frame (19) is arranged, the pressure roller (30) to outside of the web (71) on a downward semicircle is located, the empty reel reel (9) is pivoted. 3. Apparatus according to claim 1 or 2, characterized in that twice the distance (A) of the bearings of the reel rollers (9,10) of the bearing (60) of the turntable (6l) is slightly larger than the radius of an empty reel ro Ue (9), the diameter the pressure roller (30) and the radius of a full roll (11) are together. 4. Device according to one of the preceding claims, characterized characterized in that laterally above the reel (9) in the working position a cutting device (50,50a, 50b) to the Side cheeks (20) is pivotably arranged, the knife edge (54) in the working position (54a) approximately above the gap between the empty reel roller (9) and the pressure roller (30) and in the swiveled-out position (50b) with all between the swivel arm pair (50) extending components (51,52,54) from the rotary area (70), which the surface line of the full roll (12 v) passes through when turning the turntable (6l), is pivotable and the pivot drive (58) preferably as a pneumatically or hydraulically controlled cylinder, which between the pivot arms (50) and the side cheeks (20) are arranged, there is. 5. Apparatus according to claim 4, characterized in that the clamping cylinder (5: 52) is rotatable between the pair of swivel arms are stored, of which one., which lies in front of the knife (54) in the running direction of the film (l), in the working position (50a) next to the empty reel ro Ue (9) on the opposite one Side as the pressure roller (30) comes to rest and the other on the film web (l) in the running direction behind the Knife (54) is applied. 6. Device according to one of claims 1 to 3, characterized in that the pressure roller (30) in the pivot arm pair (31) is mounted with a further pair of swivel arms (38) in bearings (32) and the weight of the pressure roller (30) is balanced with respect to the bearing (32) by counterweights (39) and the pivot arm (38) by a force transmitter (40), preferably pneumatically controlled pistons, give a moment against the swivel arms (31), which the Andruckmoirrent the pivot roller (30) corresponds to the roll (12), and the drives (36) of the pivot arms (31) are controlled in this way be that the pivot arms (38) and (31) each have a predetermined position to each other. 7. Apparatus according to claim 1, characterized in that the pressure roller (30) is a coolant, for. B. cooling water is supplied and the coolant preferably drives a turbine drive in the pressure roller (30) so that the film (l) is wound onto the roll (12) with a predetermined tension.