DE102005038477A1 - Device for guiding a web - Google Patents

Abstract

Device for guiding a material between two positions comprises an auxiliary unit (21) having a tube (30) which encloses an inner chamber impinged with a low pressure. The tube has a planar outer surface (44) on a part of its periphery through which is guided a suction opening arrangement having a suction opening up to the inner chamber. Preferred Features: The tube is held by supports (41, 42) at both ends. One support (41) has a rotary drive (43) acting on the tube. The tube has a curved casing with an opening receiving an insert.

Description

The The invention relates to a device for guiding a web from a first Position to a second position, in particular from an unwinding station to a winding section of a roll winding device, with a Auxiliary device, which is the web at the first position in full Width detected.

The The invention will be described below using the example of a reel winder described. Here is a web, especially a paper web, withdrawn from a supply roll, guided by a longitudinal cutting device and then fed to a winding section, where the web then present in partial webs wound up on partial web rolls becomes. These partial web rolls can For example, in a Doppeltragwalzenwickler or in a support or Contact roller winder are wrapped.

At least at the first commissioning, but usually also at certain Business interruptions, the must Track be led from the unwinding station to the winding section.

For this so-called performance or insertion process it is usual, to lace the web, i. with a section, which has a much smaller width than the web itself. A Such tip is much easier to handle than the web in full width. But it has the disadvantage that a not too negligible Part of the track is lost. In particular, one can use the slitting knife only enter the train when the track is full width arrived at the winding section.

you therefore has in the older one German Patent Application 10 2004 049 720 proposed the train to detect with an auxiliary device and the auxiliary device then lead along the given track path. For this it is necessary that the Auxiliary device over the web can capture their full width.

Of the Invention is based on the object, in a simple way a train to record in full width in the area of their beginning.

These Task is characterized in a device of the type mentioned by solved, that the auxiliary device a tube enclosing an internal space, which can be subjected to negative pressure, wherein the tube has a flat outer surface on a part of its circumference, through the one suction opening arrangement with at least one suction opening led to the interior is.

These Design has several advantages. The auxiliary device is inexpensive as To manufacture pipe. In the tube is the interior, in which the negative pressure evenly over the Width of the railway can spread, available. In that the pipe a flattened outside has, there is a substantially flat surface on which the web is firmly sucked can be. In this flat area Accordingly, relatively large suction openings can be accommodated, so that the web over a correspondingly large Area can be acted upon by negative pressure. The train has to join do not deform the system at the auxiliary device. This keeps the risk of damage small. About that can out the above the suction opening arrangement suction forces applied to the web are used completely to hold the web become. When the flat outer surface is parallel to the train lies, then can column avoided between the track and the outer surface become. Compared with a tube that has a cylindrical cross-section has significantly improved holding forces.

Preferably the tube is held at both ends in each case a carrier. So you can the function of the pipe to hold the web, and the transport properties decouple. The tube is exclusively for temporary attachment used the web. The leadership of the tube along the trajectory is then taken over by the carrier. Accordingly, it is sufficient to use the tube in the carrier. Further processing of the pipe is not required.

Preferably At least one carrier has one on the tube acting on rotation drive. With that it is possible that Pipe with sucked web start in rotation, so that the web start one or more times around the pipe is wound. The ones to move the path along the trajectory between the first position and needed the second position personnel then have to no longer exclusively about the Vacuum be applied. The negative pressure rather serves to hold the beginning of the web while winding on the pipe. By the Winding then creates forces in the form of a rope friction, which are definitely sufficient to the Train to move along the trajectory.

Preferably, the tube has a curved shell with an opening into which an insert with a flat contact surface is inserted. This facilitates the production on the one hand. It is possible to use as shell a half-shell or a shell which extends over a correspondingly larger or smaller circumferential angle. Such a shell can be easily bent from a sheet or cut from a tube semi-finished product. In the existing or emerging opening the insert can be used. It is then possible to design the insert exclusively for cooperation with the web, in particular in view of the fact that the web should not be damaged when it is being sucked up to the auxiliary device.

Preferably is the use over the edge of the opening over. Of the So use covers the rest of the tube so far that the train with the pipe only so far in touch come that she is wound on the circumference of the tube ge. One avoids, however, that maybe sharp edges of the pipe at the transition from the flat surface in a curvature area remain, which damage the web could. Although it is not critical, if the beginning of the train later not more usable. This beginning will be in most cases anyway not used anymore. A damage However, there is a risk that the Pull off the train while pulling. This is avoided if the insert is big enough and free of sharp Edges is.

Also is preferred that the Insert made of a plastic is formed. A plastic is in wide areas arbitrarily malleable. So you can easily get it to the required Adapt requirements. In particular, in a plastic, which is usually softer than a metal, a lower risk the damage the train while pulling.

Also is an advantage that in Area of the suction opening a seal arrangement is arranged. Such a seal arrangement may be formed of an elastic material, for example formed moss rubber-like. If a seal arrangement exists is, then the train can better cling to the auxiliary device. The air loss during suction is lower.

alternative or additionally can be provided that the level outer surface one has less roughness than the curved portion of the outer surface. The contact surface, formed by the flat outer surface is, for example, can be ground. This also reduced the loss of air, once the web is sucked.

preferably, the auxiliary device interacts with a pressure device. Such a pressure device presses the web against the plane Contact surface. Thereafter, the negative pressure can be generated. Especially with heavier ones Webs, ie webs with a larger basis weight, For example, board webs, one achieves that the negative pressure holding the web securely to the auxiliary device.

Also is advantageous if the Saugöffnungsanordnung a changeable one has effective width. In this case you can check the width of the Saugöffnungsanordnung adapt to the width of the web. It remains at a narrower Train no open suction openings, which could disturb the build-up of a negative pressure in the interior.

The Invention will be described below with reference to preferred embodiments described in conjunction with the drawing. Herein show:

1 a roller winding device in a schematic representation,

2 a schematic representation of a modified embodiment of an auxiliary device next to a jumbo roll,

3 a schematic section through a pipe,

4 a modified embodiment of the auxiliary device and

5 a plan view of the tube from the flattened side.

1 shows a schematic representation of a reel winding device 1 with an unwinding station 2 and a winding station 3 , Between the unwinding station 2 and the winding station 3 is a slitter 4 arranged.

In the unwinding station 2 is an unwind position 5 intended. In the unwind position 5 there is a supply warehouse 6 in which a drum 7 is rotatably mounted. On the drum 7 is a mother role 8th wound up, of which a remainder still in 1 is recognizable. From the mother role 8th , which can also be referred to as a "jumbo roll", becomes a web 9 deducted. This train 9 is in the slitter 4 cut into several partial webs and in the Aufwickelstation 3 to several bobbins 10 wound up, of which in 1 only one is recognizable because these bobbins 10 are in a direction perpendicular to the plane behind each other.

The unwinding warehouse 6 is suitable for higher speeds. For example, the web 9 be deducted at a speed of 2000 to 3000 m / min. On the opposite side of the spool 7 is of course a similar Abwickellager 6 arranged.

The bobbins 10 rest on two support rollers 11 . 12 of which at least one is driven. A load roller 13 can be provided to control the winding process. Instead of the so-called "Doppeltragwalzenwicklers" can also be provided a back-up roll winder, in which the winding rolls 10 be held centrally and abut a support or contact roller.

The unwinding station 2 also has a preparation position 14 on, in another tambour 15 with a new mother role 16 is kept ready. The preparation position has a preparation camp 17 on, that's a spin of the spool 15 also allows, but is less expensive, because the necessary rotation speeds are much lower. The preparation camp 17 and the unwind warehouse 6 are through a career 18 connected to each other, on which the tambour 15 in the preparation position 14 to the unwinding position 5 can roll when a reel change is required.

In the preparation position 14 becomes the mother role 16 prepared. As a rule, some layers of the web are handled and disposed of in preparation. This process is also referred to as "stalling". For receiving the section of the web to be disposed of 9 is a pulper opening 19 provided below the preparation position 14 is arranged in such a way that the hanging under the action of gravity down web 9 the pulper opening 19 meets. Because the mother role 16 does not always have the same radius, the position of the drooping track will be 9 Although slightly shift. The pulper opening 19 but it is so big that it can catch the falling track. Optionally, in addition, a funnel 20 be provided.

It is now occasionally required the train 9 from the unwinding station 2 to the winding station 3 respectively. It must be the train 9 also by the longitudinal cutting device 4 be guided. This process is also referred to as "inserting".

For insertion, the roll winding device 1 an auxiliary device 21 on that in 1 is shown in different positions. In different positions, the auxiliary device 21 for distinction with small letters (a, b, c) provided.

The auxiliary device 21 is on a trajectory 22 guided, which is shown as a dotted line. The trajectory is realized by rails or guides that are on both sides of the track 9 are arranged outside their width. Along the trajectory 22 can also be a chain, a belt or a rope are performed, these devices are driven in a manner not shown by a common drive, so that the auxiliary device 21 in an orientation perpendicular to the direction of movement of the web 9 from the unwinding station 2 to the winding station 3 can be performed.

The auxiliary device 21 is now from the left (based on the representation of 1 ) to the under the action of gravity vertically hanging down web 9 moved up and attached to the train.

The 2 and 3 show an auxiliary device 21 in an embodiment that something of the appearance of the 1 differs. The auxiliary device 21 namely, from the other side against the train 9 hazards. In addition, the auxiliary device detects 21 the train 9 in the field of jumbo roll 16 , Otherwise, the auxiliary device 21 but basically as usable as in the embodiment according to 1 ,

3 shows the auxiliary device 21 in cross section. The auxiliary device 21 has a pipe 30 on, that has an interior 31 surrounds. The pipe 30 is formed from a half shell 32 into which an insert 33 is used. The half shell 32 engages in grooves 34 on the two long sides of the insert 33 are formed.

The use 33 is slightly up and down over the half shell 32 over, so that he the front of the half-shell 32 completely covered, so to speak. The use 33 has a height that is about the diameter of the tube 30 corresponds if this had a completely circular cross-section.

In the insert 33 are several suction openings 35 educated. If now the interior 31 is subjected to a negative pressure, then this negative pressure acts on the suction openings 35 outward. If now the train 9 outside on the insert 33 is present, then it is through the suction openings 35 on the job 33 and thus on the pipe 30 sucked firmly.

As from the right half of 5 you can see, you can see the suction openings 35 each with a seal 36 surround. This seal 36 is formed of an elastomeric material. It can for example be formed mousse-like.

In the left half of the 5 are the suction holes 35 not surrounded by a seal. You can see the surface of the insert 33 also provided with increased smoothness, for example by grinding, so that the web 9 Smooth and no gaps arise, through the air in the interior 31 could penetrate.

Of course you will get all the suction openings 35 uniform design, so either all suction openings 35 with a seal 36 provided or the entire surface of the insert 33 provided with a higher smoothness.

Now you can do the jumbo roll 16 to use as an abutment, so to speak, to the web 9 against the contact surface on the insert 33 to press. For this purpose, then the auxiliary device 21 approximately at the height of the axis of the jumbo roll 16 to arrange.

If this is not possible, you can, as in 4 shown, an auxiliary device 21 also with a pressure device 37 work together. The pressure device 37 has a stamp 38 on, under the action of a drive 39 in the direction of a double arrow 40 can be shifted, ie in the direction of the auxiliary device 21 to or from her. You can get the stamp 38 then use the train 9 against the use 33 to press.

The pipe 30 is in straps at both ends 41 . 42 stored. The one carrier 42 is shown in broken lines to the view of other elements of the 2 not to obscure.

The carriers 41 . 42 are then along the trajectory 22 movable.

The pipe 30 is in the vehicles 41 . 42 rotatably mounted. The carrier 41 has a rotary drive shown only schematically 43 on, with which the pipe 30 can be set in rotation to the web 9 wind. So if the train 9 at the contact surface 44 the auxiliary device 21 has been sucked, then the suction power is sufficient to the web 9 while winding on the pipe 30 on the pipe 30 hold. Once the pipe 30 has made one or more revolutions behind, is the web 9 with the necessary frictional force to the auxiliary device 21 established.

How out 1 It can be seen in the area of the auxiliary device 21 another cross-cutting device 23 be provided, which is a section 24 the train 9 which then separates into the pulper opening 19 falls. If only a short piece of the web 9 down over the auxiliary device 21 survives, then it is easier, the train 9 on the auxiliary device 21 wind.

How out 2 can be seen, the auxiliary device 21 a width greater than the width of the web 9 , The pipe 30 So stands on the two longitudinal edges of the train 9 something about the train 9 above. The overhang does not have to be big. But he should be enough to resolve a conflict between the train 9 and the two carriers 41 . 42 to prevent. This is true even if the wearer 41 . 42 , in the 2 are shown only schematically, are smaller.

How out 5 It can be seen inside the pipe 30 partitions 45 . 46 provided in the direction of double arrows 47 . 48 , ie parallel to the width of the web 9 , can be relocated. This makes it possible, individual suction openings of the interior 31 separate so that these suction holes 35 no longer be sucked. By this measure, so you can the effective width of the suction through the openings 35 formed Saugöffnungsanordnung to the width of the web 9 to adjust.

An alternative to this is the unneeded suction ports 35 to close by plates.

Claims (10)

Device for guiding a web from a first position to a second position, in particular from an unwinding station to a winding section of a reel-winding device, with an auxiliary device which detects the web at the first full-width position, characterized in that the auxiliary device ( 21 ) a pipe ( 30 ) having an interior space ( 31 ), which can be acted upon by negative pressure, wherein the pipe ( 30 ) on a part of its circumference a flat outer surface ( 44 ), through which a suction opening arrangement with at least one suction opening ( 35 ) to the interior ( 31 ) is guided. Device according to claim 1, characterized in that the tube ( 30 ) at both ends in each case a carrier ( 41 . 42 ) is held. Apparatus according to claim 2, characterized in that at least one carrier ( 41 ) one on the pipe ( 30 ) acting rotary drive ( 43 ) having. Device according to one of claims 1 to 3, characterized in that the tube ( 30 ) a curved jacket ( 32 ) having an opening into which an insert ( 33 ) with a flat contact surface ( 44 ) is used. Device according to claim 4, characterized in that the insert ( 33 ) over the edge of the opening. Device according to claim 4 or 5, characterized in that the insert ( 33 ) is formed of a plastic. Device according to one of claims 1 to 6, characterized in that in the region of the suction opening ( 35 ) a sealing arrangement ( 36 ) is arranged. Device according to one of claims 1 to 6, characterized in that the flat outer surface ( 44 ) has a lower roughness than the curved portion of the outer surface. Device according to one of claims 1 to 8, characterized in that the auxiliary device ( 21 ) with a pressure device ( 37 ) cooperates. Device according to one of claims 1 to 9, characterized that the Saugöffnungsanordnung a changeable one has effective width.