EP3061607B1 - Strand catching device - Google Patents

Description

The invention relates to a strand catching device on a machine processing an endless substrate web, in particular a printing material web. This can be, in particular, a web-fed printing press that actually processes endless printing material for catching strands or partial webs that are no longer sufficiently guided in the folding structure.

In a web-like processing substrate machines, such as a virtually endless printing material web-processing web press, the full-width paper web is printed. In order to be able to process the printed full-width web with web widths of up to approx. Three meters in offset printing and up to more than four meters in gravure printing to meaningful products, the printing material web is usually divided into strands after printing. Instead of the term strand is sometimes the term sub-orbit used. These strands are aligned with one another via a so-called folding structure, which is also sometimes referred to as a turning unit. The strands belonging to a folded product, which are usually fed into the same folding unit, are arranged in the folding structure completely or partially above one another and aligned before the strands belonging to a bundle of strands are fed to a folding unit. Before the entry of the strands into a folding unit, these can optionally be guided via a former to form a longitudinal fold.

In Falzaufbau thus runs almost every strand at least one angle or offset rod, usually passes through at least one Strangzugwalze, and is usually on so-called register rollers, possibly even on additional web control for correct alignment in Bedruckstoffrichtung and performed across.

Because of this diverse strand guidance options, it is thus possible that a single strand breaks, so that the tension is interrupted at least in this strand, which either leads to winders in particular to draw rolls or fractures caused further strands.

The risk of web or strand breaks can not be ruled out even with perfect web guidance and machine control, since the substrate quality can be subject to fluctuations both in the longitudinal direction of the web and transversely thereto or, for example, printing material rolls can be damaged during transport. Such weaknesses or mechanical damage, especially in the edge region of a web or a strand increase the risk of a web or strand break considerably.

In particular, in modern, high-speed printing presses with production speeds of up to more than 17 meters per second fall in a strand break considerable amounts of paper, so that the risk of further strand breaks by ungagement nachgeförderte strands considerably increases, especially if in the case of a strand break the strand in Bedruckstoffrichtung Seen behind the fracture point is further promoted and can penetrate into areas of the folding structure or the folding unit.

To avoid winders or paper jams, so-called safety devices are known from the prior art in which the web or, theoretically, also the strand is guided through or at a potential nip, for example, two rotating, mutually parked rollers. In the case of a detected train or theoretically also strand breakage, the safety gear is activated so that the always rotating rollers are turned on and wind up the trailing track or the trailing train to avoid winders or stoppers.

Methods are also known from the prior art, in which upon detection of a web and / or strand break by means of web or strand break sensors not only a safety gear is triggered, but at the same time also at different points in a printing material processing machine attached teeing devices activated and stopped the machine in the so-called safe-stop mode as soon as possible, so that only a relatively limited amount of the substrate in the respective components or Wicklergefährdeten areas such as draw rollers is promoted.

The DE 10 2008 040 818 A1 discloses a winding device for a material web with an unwinding station, in which the material web severed in the event of errors by means of a knock-off device is collected in a reject container.

The DE 103 38 973 A1 teaches a web-fed printing press with a knock-off device, wherein in the case of a fault, the full-width web is detected by means of web-catching rollers of a web-catching device and fed to a collecting container.

From the EP 0 575 786 A1 an embodiment of a web catching device for automatically catching a torn paper web is known, in which the torn paper web detected before a drying device by means of two rotating rollers and thus pulled out of the machine and a collecting container is supplied.

However, this prior art has many disadvantages. For example, such safety gears, which are also referred to as return safety, require a relatively large mechanical space. In addition, these are mechanically relatively complicated, since they require, for example, at least one drive and must be permanently driven during operation of the machine to ensure an extremely short reaction time. This high mechanical and control engineering effort also results in high investment costs.

In addition, have safety devices such as teeing devices the disadvantage that until the stop of the machine due to the high production speeds still high amounts of the printing material are promoted in the various components of the machine, resulting in a relatively high stop risk.

In particular, in the known solutions of disadvantage that after a web or strand break and the resulting knocking off and / or stopping the system both the printing substrate and the strands must be completely retracted again. In systems with a large substrate width and thus a high number of strands, this leads to relatively long downtimes and long production losses of the plant.

The object of the invention is therefore to provide a solution with which on the one hand the stop risk in the case of a strand break avoids or at least minimized and at the same time the effort for pulling in the one or more strands is minimized.

The object is achieved in such a way that the preferably seen in the web running direction is attached to or after a towing device, in which the trailing rest of a broken strand enters, without touching other strands or substrate-promoting components and thus be able to damage.

Advantageous embodiments of the functional element are the subject of the dependent claims.

The invention is based on the consideration that long set-up times therefore result from strand breaks, since on the one hand the post-conveyed strand, which no longer runs in the intended strand guide, is conveyed into other web and / or strand-guiding components, thereby and / or strand breaks, winders, etc. caused.

On the other hand, one or more web and / or strand separation devices is activated in the event of a strand break to avoid the Nachförderns high quantities of printing material. However, by knocking off the web and / or the strands of the entire substrate is actually removed from the machine, so that the resumption of production usually a total retraction of all webs and strands is required.

In this respect, the invention is based on a strand break the nachgeförderten strand, which is promoted due to the collapse of the strand tension, in particular at a draw roller arbitrarily from the respective machine component, in particular from the folding structure, and to isolate in a spatially separated area, so that this is not can get into a component of the web-processing machine more.

Such spatial isolation of the incoming strand can be carried out either by a permanently installed spatial structure in the form of a cage or for example a grid box. The separation must be such that it is impermeable to the incoming strand.

The strand catching device can also be designed as a trough-shaped structure which starts at a Strangzugwalze, preferably on a web-width Strangzugwalze or encloses this at least in a projection to accommodate the trailing broken strand. At the web-width Strangzugwalze the arrangement is therefore particularly advantageous because shortly before the web-width Strangzugwalze the web is usually cut into strands. Thus, all strands are still side by side on the web-width Strangzugwalze, so that the trailing, unguided strand can be best taken at this point, especially since this is difficult when strands are arranged one above the other.

Preferably, a squeegee is attached to the Strangzugwalze on which adjoins the designed as a spatially isolated structure strand catching device, so that this avoids that the subsequent strand catches on the Strangzugwalze and is wound around this.

The strand catching device can be made either of a solid, non-flexible separation, such as sheet metal, gratings, etc. The strand catching device can also be made of a flexible material, such as a solid fabric or a tarpaulin. However, it is also possible to make them from a flexible in one dimension material such as a lamella or lamellar material.

Fig. 1

Eine zur Verarbeitung einer Substratbahn geeignete Maschine am Beispiel einer Rollendruckmaschine

Fig. 2

Einen beispielhaften Falzaufbau einer Rollendruckmaschine

Fig. 3

Eine beispielhafte Ausgestaltung einer aufrollbaren Strangfangvorrichtung

Fig. 4

Eine beispielhafte Ausgestaltung einer Strangfangvorrichtung

An embodiment of an invention will be explained in more detail with reference to a drawing. Show:

Fig. 1

A suitable for processing a substrate web machine using the example of a web press

Fig. 2

An exemplary folding structure of a web-fed printing press

Fig. 3

An exemplary embodiment of a rollable strand catching device

Fig. 4

An exemplary embodiment of a strand catching device

Identical parts are provided with the same reference numerals in all figures.

FIG. 1 shows a web printing machine 1, with which a printing material web 10, that is, a web-shaped substrate is processed. The web-shaped substrate, hereinafter referred to as web 10, is unwound from a roll, the web 10 is printed after building a web tension by means of the printing units, then in case of need, the printing substrate is dried and optionally cooled to subsequently conveyed into the folding structure 2 become.

In FIG. 1 By way of example, an illustration web offset printing machine 1 with a horizontal web guide in the area of the printing units is shown. The present invention can also be applied to newspaper web offset printing presses, web gravure presses, web flexographic printing presses, web presses or roller digital presses implement, ie the The invention is applicable to all known printing machines that print a printing substrate 10.

In the folding structure 2 or also called turning unit, the web 10 is usually, but not necessarily, laterally aligned, usually the print quality is checked to mostly, especially in large web widths the web 10 by means of a longitudinal cutting device 6 into individual, initially adjacent strands 11 split. These strands 11 are aligned with each other in the position required for the respective production to each other, so that they are usually arranged one above the other, to be subsequently fed to a folding unit 9.

FIG. 2 shows by way of example a typical folding structure 2 of an illustration web offset printing machine 1, wherein the invention is independent of the configuration of a folding structure 2.

In the in FIG. 2 illustrated configuration of a folding structure 2, the web 10 runs into the bottom Falzaufbau 2 bottom left, usually passes through various sensors for detecting and regulating the pressure parameters, to be subsequently divided into individual strands 11 in the longitudinal cutting device 6. In most cases, but not necessarily, the strands 11, which are still viewed transversely to the strand running direction 12, are guided onto a web-width stranding roll 3-1 in order to build up the required web or strand tension in the web 10 or in the strands 11.

This web-width Strangzugwalze 3-1 is not absolutely necessary, with the help of this roller can also be used only a guide roller, which is also called Aufteilwalze because of the special use.

At the in FIG. 2 2, this dividing roller is designed as a web-width deflecting roller 4-1, from which the strands 11 are guided onto the various turning bars 7, which are generally arranged one above the other, in order to be laterally aligned with each other.

Alternatively, a folding configuration is conceivable in which on the dividing roller only the longitudinal section, d. H. the division of the web 10 into individual strands 11 takes place.

The after the turner bars 7 usually superimposed strands 11 are subsequently fed to a folding unit 9, which optionally upstream of a former 8 for producing a first longitudinal fold.

Tear now in the area after the web-width draw roller 3-1 a strand 11, the strand strand 12 in the previous direction lying fraction of the strand is usually still pulled or promoted by the Falzaufbau 2, although due to the no longer present strand tension at least the quality of the strand guide is impaired. There is always the risk of a winder or paper jam or the breaking of other strands 11 in such an event.

However, there is a very high likelihood that the part of the strand 11 lying in line running direction 12 before breaking will be conveyed through the folding structure 2 and into the folding unit 9 without further disturbances. In this case, depending on the position of the break point remains a more or less long, seen in strand direction 12 behind the fracture lying strand 11 left, which usually has no more web tension and thus ungauged in its position. Furthermore, it should be noted that this strand 11 is nachgefördert due to the high production speeds of modern web presses of up to 17.5 meters per second with considerable speed, making this part of the strand 11 in the shortest possible time and even after an initiated stop the press 1 to a standstill this has a considerable length.

To avoid that this broken strand 11 gets into other web or strand-leading areas of the folder assembly 2, and there winder, tamper or further strand breaks and resulting from these possibly cause damage to the components of the folding structure 2 or the folding unit 9, the trailing strand is collected in a strand catcher 20 to be spatially isolated there and thereby avoid that the nachgeförderte strand 11 in other components of the printing machine 1 passes.

Thus, according to the invention, the strand trapping device 20 comprises a container 21. This container 21 only has to be designed in such a way that it reliably retains one or more strands 11. Advantageously, the container 21 is designed in such a way that it can also reliably restrain arc-like strand sections, since sheet-like pieces can also be formed in the event of a web or strand break.

In order to ensure retention of extrudates and / or sheets, the container may be made of a continuous material such as a sheet, it may also be materials with a non-closed surface such as grids, nets, sheets with punched or the like can be used.

In a particularly advantageous embodiment of the invention, the strand catcher 20 or the container 21 may be formed as a trough-shaped collecting device 22, which can be adjusted according to the spatial conditions in the folding structure 2. Here, the trough-shaped collecting device 22 may also be designed to be closed on the lateral end faces. However, since the collected strands or 11 come to lie as a rule immediately after entering the container 21 or in the trough-shaped collecting device 22, the end faces of the trough-shaped collecting device 22 may also be open. This facilitates in particular the removal of the strand remnants, since these can then be pushed out of the container 21 or out of the trough-shaped collecting device 22, for example with a broom or a rod.

The strand catching device 20 is basically arranged in the folding structure 2 and is advantageously arranged there in a stranding direction 12 on or after a stranding roll 3 or on or after a deflection roll 4. Thus, the container 21 may include the relevant draw roller 3 or deflection roller 4 - this is expressed by the term "on" - or may be arranged downstream in the strand direction.

In an advantageous embodiment, the strand catching device 20 is arranged in a region in which the strands 11, which are cut from one or more webs 10, are arranged transversely juxtaposed in the stranding direction 12, since at such a point with a catching device 22 all adjacent ones , that is, in general, all strands 11 cut from a web 10 can be collected with only one catching device 22.

Thus, it opens up, why, in a particularly advantageous embodiment of the invention, the container 21 or the strand catcher 20 designed as trough-shaped catcher 22 seen in strand direction 12 on or after a web-width draw roller, in particular a web-width Strangzugwalze 3-1 or on or after a web-width guide roller 4-1, since the rolls 10 cut from a web 10 are arranged next to each other on such rolls, so that all strands 11 of a web 10 can be collected with a single strand catching device 20.

To ensure that in the case of a strand break the trailing strand 11 is conveyed into the collecting device 22 or in the container 21, in a particularly advantageous embodiment of the invention, the strand catching device 20 also includes a doctor blade 5, which is employed on the Strangzugwalze 3 or guide roller 4 is to avoid a winding of the broken and trailing strand 11 or the plurality of broken and trailing strands 11 safe as out FIG. 3 can be seen. This may be a doctor blade 5, which is employed either in the axial extent of the roller completely or partially against the roller surface or at a small distance thereto is, or the doctor engages in grooves of the roller, to ensure in this way a detachment of the trailing strand 11 of the roller.

The in the Figures 3 and 4 shown containers 21 and the collecting devices 22 shown can be made of either a mechanically stable and unyielding material such as sheet or grid, but these can also be made of a flexible material such as a fabric, a tarpaulin or a network. On the one hand, a flexible material is completely sufficient in that the exact shape of the container 21 is generally not important. Furthermore, a container 21 made of a flexible material automatically adapts itself to possibly existing interference contours such as galleries or railings, which is particularly the case Retrofitting is an advantage.

Alternatively, the container 21 can also be made of a material which is flexible in only a first extension, that is, only in one dimension and is substantially inflexible or highly inflexible in a second extension. By way of example, these can be lamellas joined to one another, which are movably connected at their longitudinal edges to the adjacent lamella, as is known, for example, from roller shutter profiles or blinds. Such a configuration has the advantage that the container 21 existing interference contours is adaptable, but that nevertheless in one dimension, preferably in the axial extension of the tension roller 3 or guide roller 4 and thus transverse to the strand direction 12, a mechanical stability is given.

As in FIG. 3 represented, with a flexible material or with a flexible material in only one dimension, the invention can be configured in such a way that the collecting device 22 is designed to be rollable. Thus, a winding device 23 is mounted at least at one end of the collecting device 22, on which the material of the collecting device 22, either for example, a tarpaulin, a fabric, a net or a kind of blinds, can be wound up. Thus, the catcher 22 can be removed with little effort to for example, for maintenance or cleaning or just to pull a web or strands in the Falzaufbau optimal access to allow.

As in FIG. 3 In this case, two take-up devices 23 can also be used, wherein the material of the catching device 22 is wound on a first takeup device 23-1, and belts 23-2 are unwound on the second takeup device, which are unwound with the unwound end of the material of the catching device 22 are attached.

By such straps, the material of the collecting device 22 can be unwound again from the first winding device 23-1, that by collecting the straps the collecting device 22 is again formed with minimum personnel expenses in its original shape and in its intended form in Falzaufbau 2. The at least one take-up device 23 can be driven either manually or by motor.

With a motor drive of the winding device 23, different automation steps can be realized, so that the strand catching device 20 or catching device 22 can be unrolled or rolled in, for example, by pressing a button. It is also useful, for example, to couple the unrolling or unrolling of the strand catching device 20 or the catching device 22 to the state of the machine 1, so that, for example, during the set-up operation of the machine 1, the strand catching device 20 or the catching device is wound up automatically in this operating state To allow maximum accessibility, while in the production mode of the machine 1, the strand catcher 20 and the drip pan 22 is automatically rolled out in order to be able to catch broken strands 11 if necessary.

For easier winding and unwinding, it is also possible, the material of the collecting device 22 in guide rails, not shown, which in the projection a plan view of the folding structure 2 parallel to the strand running direction 12 extend to lead.

According to a further embodiment of the invention, although not shown in any of the figures, the container 21 or the collecting device 22 of the strand catching device can be designed to be removable from the folding structure.

LIST OF REFERENCE NUMBERS

1

Machine / printing machine

2

folding structure

3

Strangzugwalze

3-1

web width of the tension roller

4

deflecting

4-1

web width deflection roller

5

doctor

6

Slitter

7

turning bar

8th

formers

9

folding

10

Substrate web / web

11

strand

12

Strand running direction

20

Train safety gear

21

container

22

catcher

23

rewinder

23-1

first take-up device

23-2

second take-up device

Claims (9)

1. A strand catching device (20) of a machine (1), which processes a continuous printing material web (10), in particular a web fed printing press (1), which processes a continuous printing material web (10), for catching one or a plurality of broken and ending strands (11), wherein the strand catching device (20) comprises a container (21), which holds back a sheet or strand,
   characterized in that the strand catching device (9) is arranged in a folder superstructure (2).
2. The strand catching device according to claim 1, characterized in that the strand catching device (20) is arranged on or downstream from a strand drawing roller (3) or on or downstream from a guide roller (4).
3. The strand catching device according to claim 1, characterized in that the strand catching device (20) is arranged on or downstream from a web width strand drawing roller (3-1) or on or downstream from a web width guide roller (4-1).
4. The strand catching device according to one of the preceding claims, characterized in that the strand catching device (20) is arranged in areas, in which the strands (11) are arranged next to one another in a direction of extension perpendicular to a strand running direction (12).
5. The strand catching device according to one of the preceding claims, characterized in that the strand catching device (20) comprises a doctor blade (5) on the upstream strand drawing roller (3) or on the upstream guide roller (4).
6. The strand catching device according to one of the preceding claims, characterized in that the strand caching device (20) is made of a flexible material.
7. The strand catching device according to claim 6, characterized in that the strand catching device (20) is made of a material, which is flexible in a first extension and which is inflexible in a second extension.
8. The strand catching device according to one of claims 6 or 7, characterized in that the container (21) or the catching device (22) is embodied so as to be capable of being rolled up.
9. The strand catching device according to one of the preceding claims, characterized in that the strand catching device (20) or the container (21) is capable of being removed.

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