EP1580319B1 - Device and method for guiding a lead-in strip - Google Patents

Abstract

A papermaking assembly presents a web feed ribbon to a process station. The feed assembly has two cables parallel to the web from the take-up position to a release position. The cables (16, 17) pass through a trap (18) at which point they come close together. When the trap is relaxed the cables are parallel to the direction of travel. Following operation of the trap the cables are no longer parallel to the machine direction of travel. The change in angle is effected by the trap. The trap (18) has cable-feed grooved rollers (18, 19) with variable angle of inclination. The clamp is lever operated. Also claimed is a commensurate operating process.

Description

The invention relates to a device for guiding a threading strip of a material web along a web path with a cable arrangement comprising at least two ropes, which are guided on a guide path in the machine direction next to the web path from a receiving position to a dispensing position, wherein the ropes in the region of the collecting position converge in a rope scissors. Furthermore, the invention relates to a method for guiding a threading strip of a material web along a web path in which the threading strip is clamped between at least two ropes which are guided adjacent to the web path parallel to the web path between a catch position and a machine direction release position.

The invention will be described below with reference to a paper web as an example of the material web, but without being limited to this example.

A paper web is produced with relatively large widths of currently up to 10 m. During production, it must be passed through a series of processing facilities. These include, for example, the press section and the dryer section of a paper machine, a calender, a coater, etc. Between these individual facilities or units and in individual facilities there are free trains in which the paper web is not directly supported, so not on a roller, a roll or a drum rests. Such free moves need to be bridged when recording or resuming production.

The web must be fed many times at the speed through the aggregates with which it is discharged from the paper machine. This speed is often much more than 1,000 m / min today.

Therefore, so-called cable guides are often used for the insertion process of the paper web. A cable guide is guided parallel to the desired course of the paper web through the corresponding unit or bridges also free trains between units. In the region of the web path, two or even three cables are arranged closely adjacent to one another and form a guide path in this area. Outside the railway path, the ropes usually go through separate circuits. At the beginning of the railway path is a so-called "rope scissors", in which the ropes converge. The beginning of the paper web, which runs into this rope scissors, is therefore gripped by the converging ropes, clamped and then pulled in the guide track along the web path through the desired processing unit.

Since it is technically extremely difficult to thread the paper web with the entire width at once, cut a narrow strip with a width of 20 to 30 cm from the incoming paper web in front of the rope shears and allows the rest of the paper web run into the pulper. Only this strip is then taken in the rope scissors of the ropes and pulled along the track path.

The ropes are outside the later treatment path, that is arranged outside the track path. This has the advantage that they can not interfere with the treatment of the web later. However, this one has Arrangement the disadvantage that the strip which is cut from the paper web, not only a short distance in the machine direction must be promoted to be taken in the rope scissors of the ropes. He must also be a certain distance laterally, so in the cross machine direction, deflected. The necessary lateral offset is often in the order of 10 to 50 cm. To effect this lateral offset, auxiliary equipment is used, such as suction or blowing nozzles or pivotable baffles or guide strips. This results in a considerable maintenance and a risk during insertion, if these facilities fail. When using air, the success of insertion is highly dependent on environmental conditions, especially grammage, moisture content, strip width and machine speed. With the lateral offset, there is the risk that the strip of foil twisted and then tears at the edge. In this case, the insertion process must be repeated.

One has therefore in DE 199 54 466 A1 proposed to move the entire cable arrangement in the cross machine direction, so that the threading strip no longer has to be deflected transversely to the rope level to be detected in the rope scissors of the ropes. This measure has proven itself. However, it requires that the ropes can be moved to the "active" area of the processing device, which is not always possible. For example, if the web is to be passed through a calender, then the calender rolls must be moved apart so far that the ropes can pass through the nips between adjacent rolls. It is therefore only possible to use relatively thin ropes or bands. After inserting the threading strip, it takes a relatively long time for the unit to start its work, because it is necessary to wait until the cables have been moved out of the active area again.

The invention has for its object to make the insertion of Einfädelstreifens reliable in the rope scissors.

This object is achieved in a device of the type mentioned above in that the ropes in the region of the rope scissors between a rest position outside the track path from which the ropes in the rope plane, and a collection position within the track path from which the ropes in a Transition portion extend at a predetermined angle to the cable plane, are displaced.

Here one combines the advantages of a "classic" rope guide, in which the ropes are completely out of the later track path and therefore do not interfere with the production, with the advantage of being able to catch the Einfädelstreifen without own lateral deflection with the ropes. The threading strip can therefore be moved straight ahead, ie in the machine direction. Only for the purpose of gripping this Einfädelstreifens the ropes are deflected. Once the ropes have taken the Einfädelstreifen, they can be moved back to their rest position. The seized threading strip is indeed moved outside of the web path. But this is harmless, because he can pull himself over a smaller area, so to speak. If it is assumed that the cable loops of the individual ropes are guided at least in the guide track in each case in a so-called rope level, then the ropes are deflected with a short section following the rope shears relative to this rope level. Moreover, each rope remains in the rope plane, ie outside the track path, so that one must meet here no restrictions with regard to the guidance of the ropes by a treatment device. The short section, which is deflected out of the rope plane, can be arranged to accommodate the later treatment of the web does not bother. The term "rope" is used here for the sake of clarity. The term "rope" should also be understood to mean corresponding elements, for example bands.

Preferably, the ropes are displaced by the rope cutter. In addition to the function of clamping the threading strip, the rope scissors then have the function of relocating the ropes. Since a device is available with the rope scissors anyway, with the ropes are positioned, you can give the rope scissors with relatively little effort this additional function.

Preferably, the rope scissors on rollers on which the ropes are guided, and the rollers are tilted. By tilting the role can be easily achieve a lateral displacement of the cables with a section in the catchment position. There are various possibilities for relocation. For example, you can use smooth rolls on which the ropes then slide when tilting the rollers in a certain direction, namely in the cross machine direction, on the track path.

In a particularly preferred embodiment, however, it is provided that the rope scissors rollers having guide grooves in which the ropes are guided, and the rollers are displaced. This is also achieved in the movement of the "rope beginnings", i. the sections of the ropes that follow the rope scissors, a reliable guide. About the movement of the rollers provided with guide rollers can be relatively accurately control the displacement movement of the cables in the cross machine direction.

Preferably, the rope cutter is attached to a lever which is pivotable about an axis which is parallel to the machine direction. Of the The term "parallel" is not to be understood in a mathematical sense. Even larger deviations are quite permissible. The lever is pivotable in the transverse machine direction, ie the rope scissors, which has a certain distance from the axis is displaced by this pivotal movement in the transverse machine direction.

It is preferred that the lever is vertically aligned in the catching position and inclined in the rest position. The rope scissors must remain in the catching position even when guiding the Einfädelstreifens along the track path only for a comparatively short period of time. In essence, this is necessary only until the beginning of the threading strip has been seized. Since a certain force is usually required for erecting the lever, the operation with a vertical position in the catching position is economical. In the rest position, the lever may rest against a stop, for example. Once the Einfädelstreifen has been guided along the track path and you can apply a train on the Einfädelstreifen, the cable guide can be disabled anyway, because then pulls the Einfädelstreifen laterally from the ropes and cuts the web to width.

Preferably, the ropes at least at a predetermined distance in the direction behind the rope cutter on a fixedly arranged lateral guide. This measure ensures in a simple manner that only a portion of the ropes, which follows the rope scissors, more precisely the catching position, is deflected. The rest of the ropes remain in the rope plane, ie outside the track path, so that the treatment device through which the material web is to be guided, is not affected.

Preferably, the rope scissors on an opening device. This embodiment has the advantage that the rope cutter can be opened. This is done to clamp only the beginning of the threading line between the ropes along the track path. This is enough. In general, the threading strip must have sufficient strength so as not to break off. A certain distance after the beginning of the threading strip, the threading strip can then move laterally out of the cable guide. He is thus after insertion already in the path or just with a small offset in the cross machine direction next to it. The subsequent width cutting of the web then leads a little faster that you can take the treatment of the web.

Preferably, in the running direction of the threading strip in front of the rope scissors, a first element of a cutting shear is arranged, with which cooperates in the collecting position of the rope scissors, a second element of the cutting shear. The use of a cutting shear has the advantage that the Einfädelstreifen is severed over its entire width virtually simultaneously. The first element of the cutting shear can then be used simultaneously as a guide element. Of course, it is also possible to use in addition to the first element of the shearing a simultaneously swung additional guide, which leads the threading strip in the direction of the rope scissors. If you place the second element of the shears on the rope scissors, then it is ensured that the impact shears can only be active if so desired, namely, when the rope scissors is in the catching position. Once the rope scissors is outside the collection position, for example, in the rest position, even accidental actuation of the first element of the cutting shear can not cause the Einfädelstreifen is severed.

The object is achieved in a method of the type mentioned in that the cables are deflected with a portion in the region of the collection position upon detection of a beginning of the Einfädeistreifens in the web path.

As explained above, it is achieved with this procedure that, with a small exception, the cable guide can be kept completely outside the path of the track. Only in a relatively short section at the beginning of the route in which the ropes are guided, the ropes are deflected in the cross-machine direction and indeed so far that they can detect the Einfädelstreifen. Once this has been achieved, a further selection guidance is no longer required.

It is preferred that the portion of the cables after detection is moved out of the path again. This keeps the friction, which acts by the deflection of the ropes laterally on the ropes, small. The ropes are deflected only for the time necessary to detect the beginning of the threading strip. Moreover, the rope scissors can remain in the rest position.

Preferably, the ropes are brought together in the collecting position in a rope scissors and the rope scissors is opened after detecting the beginning of the threading strip. This allows that the Einfädelstreifen with a section that follows the beginning, is no longer detected by the ropes. This is not necessary because it is sufficient to lead only the beginning of Einfädelstreifens using the cable arrangement. The remainder of the threading strip is then no longer guided by the ropes, but by the train of the web, ie the threading strip itself. This makes it possible that the threading remains at least largely in the path.

Fig. 1

eine Vorrichtung zum Führen eines Einfädelstreifens in Seitenansicht in einer ersten Betriebssituation vor dem Erfassen eines Einfädelstreifens,

Fig. 2

die Vorrichtung nach Fig. 1 beim Erfassen des Einfädelstreifens,

Fig. 3

die Vorrichtung nach Fig. 1 nach dem Erfassen des Einfädelstreifens,

Fig. 4

einen Ausschnitt aus der Vorrichtung in Vorderansicht in einer Auffangposition,

Fig. 5

die Vorrichtung nach Fig. 4 in der Ruheposition und

Fig. 6

eine schematische Darstellung zur Erläuterung eines Bahnverlaufs.

The invention will be described below with reference to a preferred embodiment in conjunction with the drawings. Herein show:

Fig. 1

a device for guiding a threading strip in side view in a first operating situation before the detection of a threading strip,

Fig. 2

the device after Fig. 1 when detecting the threading strip,

Fig. 3

the device after Fig. 1 after detecting the threading strip,

Fig. 4

a detail of the device in front view in a collecting position,

Fig. 5

the device after Fig. 4 in the resting position and

Fig. 6

a schematic representation for explaining a trajectory.

Based on Fig. 6 should first be explained the problems underlying the invention.

A paper web 1 (or another material web) comes from a first processing station 2, for example the exit of the press section of a paper machine, and is then to be passed through a second processing station 3, for example the dryer section, in which several Drying cylinders are arranged 4 to 6, over which the paper web 1 must be performed alternately above and below.

Parallel to the course of the paper web 1 through the processing station 3, ie in the same way as the paper web 1 above and below the drying cylinder 4-6, a cable assembly 7 is guided. The cable arrangement 7 is arranged outside the web path of the paper web 1 in a guide path. It is passed over rollers 8-10, which is designed as guide rollers with side guides not shown for the cable assembly 7. The cable assembly 7 consists of two or three cables which are mounted in corresponding circumferential grooves in the rollers 8-10. The rollers 8-10 have the same diameter as the drying cylinders 4-6. But they are rotatably mounted relative to the drying cylinders 4-6.

At least in the area adjacent to the paper web 1, i. along the web path of the paper web 1, the cable assembly 7 is arranged in a plane on which the paper web 1 is vertical. This level is called the "rope level". Outside this guide path parallel to the path of the ropes cable assembly 7 are each performed in a single circulation. It is quite possible that the ropes in this circulation also run outside the rope plane.

For "threading" the paper web 1 in the processing station 3, a threading strip 11 is first cut from the paper web 1. The remainder of the paper web 1 is fed into the pulper and disposed of. The threading strip 11 must now be gripped by the cable arrangement 7, which, as mentioned above, is arranged outside the web path of the paper web. In order to enable this gripping, a section 12 of the cable arrangement 7, which adjoins a receiving position 13, deflected out of the rope level in the path so that the portion 12, as shown with dashed lines, is inclined to the rope level, that includes a predetermined angle with the rope level.

One can also describe the situation in other words: The paper web 1 runs in the machine direction. The cables of the cable arrangement 7 are displaced at the receiving position 13 in the transverse machine direction, ie perpendicular to the machine direction, so that the cable arrangement 7 remains largely in the cable plane, but the section 12 extends as a transition section at a predetermined angle to the machine direction.

Based on Fig. 1 to 5 Now, the device used for this purpose and the method will be explained in more detail. With dashed lines, an output drum 14 of the processing station 2 and an input roller 15 of the processing station 3 are shown.

The cable arrangement 7 has an upper cable 16 and one or two lower cables 17, which converge in a cable cutter 18. The rope cutter 18 has an upper deflection roller 19 for the upper cable 16 and a lower deflection roller 20 for the lower cable 17. The following is spoken of an upper cable 16 and a lower cable 17, even if instead of a rope two ropes can be present.

The rope cutter 18 is arranged at the upper end of a lever arm 21 which is pivotable about an axis 22 which is arranged parallel to the machine direction. For pivoting a pivot drive 23 is provided, which may for example have the shape of a piston-cylinder unit.

Like from the Fig. 1 to 3 can be seen, the lower guide roller 20 with respect to the upper guide roller 19 is displaced, wherein a corresponding positioning drive 24 acts on a lever 25 on which the lower guide roller 20 is arranged. In the in Fig. 1 shown position of the lower pulley 20, the cable shears 18 is opened accordingly.

In this situation, the threading strip 11 of the paper web 1 first runs in the pulper, as indicated by an arrow 26.

Now, if the threading strip 11 is to be detected by the cable assembly 7 in the region of the rope scissors 18, the rope scissors 18 is displaced in the transverse machine direction, so that it passes into the path of the threading strip. Then, a first element 27 of a fly cutter pivots, which is arranged on a stand 28. The first element 27 of the flywheel cooperates with a second element 29 of the flywheel knife, which is arranged on the lever arm 21, which also carries the rope cutter 18. Simultaneously with the pivoting of the first member 27 of the flywheel a baffle 30 is swung out, so that the threading 11 is not only severed, but on the baffle 30 and the two elements 27, 29 of the flywheel knife in the rope scissors 18, which is closed for this purpose, of course , is introduced. The side assembly 7 then takes the thus formed beginning of the threading strip 11 and leads in parallel to the track path.

Like from the 4 and 5 can be seen, the rope scissors 18 between a in Fig. 5 illustrated rest position in which it is located outside the web path of the paper web 1, and a in Fig. 4 shown collecting position displaced. In the rest position, the rope cutter 18 is arranged outside the web path of the paper web 1. In the collecting position, the rope cutter 18 is arranged in the web path and accordingly able to detect the threading strip 11 without having to be displaced in the transverse machine direction.

When the rope cutter 18 in the in Fig. 4 shown collecting position, results in the Fig. 6 shown with dashed lines guide the portion 12 of the cable assembly 7, ie the cable assembly 7 extends from a position in the path path over a short distance inclined to the cable level and then back in the cable level. For this purpose, the ropes 16, 17 at the latest from the roller 8 again guided laterally.

Once the Einfädelstreifen 11 has been detected, the side scissors 18 is opened, as shown in Fig. 3 is shown by the dashed position of the lower guide roller 20. In this case, the rope cutter 18 is indeed no longer able to clamp the threading strip 11. But this is not necessary. The threading strip 11 is held only at its beginning, ie at its tip, so that the remaining remnants of the threading strip 11 can remain in the web path, even if the beginning of the threading strip 11 is pulled by the cable arrangement 7 outside the web path. Once the Einfädelstreifen 11 is no longer taken by the cable assembly 7, you can see the rope cutter 18 in the in Fig. 5 pivot shown rest position. In this position, the ropes 16, 17 of the cable assembly 7 are guided exclusively in the rope level, so that the load on the ropes remains low due to any friction occurring in the rollers.

Claims (12)

1. Device for guiding a lead-in strip of a web along a web path, having a rope arrangement which has at least two ropes, which are guided together beside the web path in the machine direction on a guide section from a pick-up position to a release position, the ropes running together in a rope pinch in the region of the catching position, characterized in that, in the region of the rope pinch (18), the ropes (16, 17) can be displaced between a rest position outside the web path, from which the ropes run in the rope plane, and a catching position within the web path, from which the ropes (16, 17) run in a transfer section (12) at a predetermined angle to the rope plane.
2. Device according to Claim 1, characterized in that the ropes (16, 17) can be displaced by the rope pinch (18).
3. Device according to Claim 2, characterized in that the rope pinch (18) has rollers (19, 20), on which the ropes (16, 17) are guided, and the rollers (19, 20) can be inclined.
4. Device according to Claim 2 or 3, characterized in that the rope pinch (18) has rollers (19, 20) having guide grooves in which the ropes (16, 17) are guided, and the rollers (19, 20) can be displaced.
5. Device according to one of Claims 1 to 4, characterized in that the rope pinch (18) is fixed to a lever (21), which can be pivoted about an axis (22) which runs parallel to the machine direction.
6. Device according to Claim 5, characterized in that the lever (21) is oriented vertically in the catching position and is inclined in the rest position.
7. Device according to one of Claims 1 to 6, characterized in that, at least at a predetermined distance in the running direction after the rope pinch (18), the ropes (16, 17) have a lateral guide arranged in a fixed location.
8. Device according to one of Claims 1 to 7, characterized in that the rope pinch (18) has an opening device (24).
9. Device according to one of Claims 1 to 8, characterized in that before the rope pinch (18) in the running direction of the lead-in strip (11) there is arranged a first element (27) of guillotine shears, with which a second element (29) of the guillotine shears interacts in the catching position of the rope pinch (18).
10. Method for guiding a lead-in strip of a web along a web path, in which the lead-in strip is clamped between at least two ropes which are guided beside the web path and parallel to the web path between a catching position in the machine direction and a release position, characterized in that one section of the ropes is deflected into the web path in the region of the catching position when gripping a start of the lead-in strip.
11. Method according to Claim 10, characterized in that the section of the ropes is deflected out of the web path again after the gripping action.
12. Method according to Claim 10 or 11, characterized in that the ropes are led together in a rope pinch in the catching position and, after the start of the lead-in strip has been gripped, the rope pinch is opened.

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