EP2251290A1 - Cover fragment retention device on a roll changer - Google Patents

Abstract

The device has a retention barrier (9) brought infront of a roll changer (10) between an unwinding roller (13) and an accessible free space (21). The roll changer lies opposite to a guiding side of a web (17), which is unwound by the unwinding roller. The barrier has a frame, which supports a retention surface. A drive element (3) is arranged with the barrier in a base-recess (7). A protective casing is arranged over the drive element. The barrier has a catching net that is formed from nylon material.

Description

The invention relates to the technical field of web offset rotary printing presses and, in particular, to the so-called roll changers which feed the printing material to the web material to be printed. The reel changers usually carry two web rolls, e.g. Paper rolls for newspaper printing, so that a new roll can be used when a roll that has just been unwound comes to an end.

One problem that occurs with such reelstands in operation is the so-called shell bursting. The web material to be printed is wound on sleeves which have only limited strength. If, on a unwound or almost unwound sleeve, the vibrations induced by the unwinding spin reach the natural frequency of the sleeve, it can be destroyed and sometimes literally burst, creating a danger from flying sleeve parts.

Various attempts have been made in the art to solve this problem. For example, in the EP 1 584 596 A2 proposed to adjust the inner diameter of the sleeve or its material or to extend the clamping length of the interchangeable cone. The DE 10 2005 048 466 A1 and the DE 10 2006 008 104 A1 reveal ways to shut off the danger zone on a reel changer large-scale, for example with fishing nets or rolling grilles. From the DE 10 2007 000 921 B3 it is known to arrange a protective cover on the rotating frame of the roll changer so that it can be pivoted with the roller carrier, and the DE 10 2007 001 671 B3 discloses a protective housing disposed on the residual roll container.

It is the object of the present invention to propose a retaining device for sleeve fragments on a web offset printing reel changer, which optimizes the protection with regard to the normal operation to be performed.

This object is achieved by a retaining device according to claim 1. The subclaims define preferred embodiments of the invention.

A retaining device according to the invention for sleeve fragments on a web offset printing reel changer has a retention barrier, which can be introduced between an unwinding roll and the accessible free space in front of the reel changer. By the term "accessible space" is meant that space or side of the reel changer to which people have access and in which persons must logically be protected from bursting pods and their flying parts. The restraint barrier according to the present invention can be introduced on the side of the roll changer, which lies opposite the guide side for the web to be unwound from the roll. Of course, this page is also the page about the accessible space. In other words, the Bedruckbahn guide and the accessible side of the roll changer according to the invention are always arranged on opposite sides of the reel changer, so that the retaining barrier can substantially completely overlap and protect the free space side. In this case, it is particularly advantageous that no consideration for the continuous web must be taken and thus the barrier can be performed without a passage gap. It can therefore follow a substantially complete coverage by the barrier, which of course increases security.

According to a first advantageous embodiment of the present invention, the restraint barrier is in its rest position, in which it is not in use, arranged substantially in a bottom recess below the roll changer, being pivotable from the rest position to its working position in which it between the roll and the free space is introduced. Advantageously, this embodiment provides an independent from the rotating frame of the roll changer and yet secure positioning and Einbringbarkeit for the retention barrier, which in particular disturbs the ongoing operation in any way. Further advantages of the thus generally defined embodiment will be explained later with reference to the description of the embodiment.

The restraint barrier may be a substantially rigid restraint barrier, in particular at least partially rigidly supported on the circumference, and in one embodiment has a frame which supports or encloses a restraining surface. Here are all known elements with which area barriers can be formed. If, according to one embodiment, the retention barrier is pivotable about at least one, preferably a single pivot axis, the drive of this pivoting movement is preferably effected by a linear drive element, especially a pneumatic or hydraulic cylinder. This drive element may, in order to save space and to create no obstructive projections, be arranged together with the retaining barrier in the bottom recess, and it is possible according to the invention to arrange a protective cover over it.

In a preferred embodiment of the invention, the movement of the retaining barrier is limited to the rest position and / or the working position by means of a mechanical stop, and this stop can be provided in particular for the working position on the rotating frame of the roll changer and depending on the angular position of the frame another, adapted working position provide for the retention barrier. This creates a high flexibility of use.

According to an alternative advantageous embodiment of the invention, the retaining barrier has a roll changer arranged on the curtain, which can be suspended to its working position. This curtain is preferably made one or more parts and at least laterally substantially unguided, ie not running in guides. The extended working position of the curtain is so Positionally essentially not mechanically predetermined, especially free-hanging. In the case of such an embodiment variant, a winding or shirring device for the curtain can be arranged on the rotating frame, especially together with a curtain drive, preferably a rotary curtain drive. Said arrangement can be carried out specifically on a projection of the rotary frame, which extends to the free space or slightly protrudes into the space inside.

In the aforementioned embodiment, it is possible to arrange a curtain, in particular such a winding or shirring device or a curtain drive, on both sides of the rotating frame for each web roll to be unwound. In other words, a curtain according to the invention is provided for each paster page. This curtain can have a continuous or perforated sheet material, in particular be fabric or foil-like or chain, lamella or rod curtain-like design.

According to a further alternative embodiment, the retention barrier has an erectable, in particular aufspannbares safety net. Even in such an embodiment, the barrier may be in its rest position in which it is not in use, arranged substantially in a bottom recess below the roll changer, being erectable from the rest position to its working position, in which they between the roll and the Free space is introduced.

If a safety net is used, this can for example be clamped between two erectile supports, these supports are preferably pivotally erectable or swiveling up. The erecting movement can in such a case, in turn, take place by means of one, two or more linear drive elements, especially with the aid of pneumatic or hydraulic cylinders. In principle conceivable, for example, is a version with only one drive element or a drive cylinder, wherein the safety net would be clamped for example between two clamping arms with a common pivot axis. A cylinder, which in such an embodiment between the two supports (Swivel arms / clamping arms) could be used then would move during his work.

The safety net can comprise a stretchable material, in particular a nylon material, which is tensioned and / or stretched when erecting the retention barrier.

Figuren 1 bis 3

eine Ausführungsform der vorliegenden Erfindung mit einem in einer Bodenausnehmung versenkbaren, schwenkbaren Rahmen, an einem Rollenwechsler;

Figur 4

eine zweite Ausführungsform einer erfindungsgemäßen Rückhaltevorrichtung mit einem Vorhang als Rückhaltebarriere; und

Figuren 5 bis 7

eine dritte Ausführungsform einer erfindungsgemäßen Rückhaltevorrichtung mit einem aufspannbaren Fangnetz.

The invention will be explained in more detail below with reference to embodiments and sub-reference to the accompanying drawings. It may include all features described herein individually, as well as in any meaningful combination. For example, the embodiments of claims 2 and 11 can be carried out only with the generic and without the characterizing features of claim 1. In particular, it should also be understood that the invention may also be construed as a method of positioning a containment barrier as described herein or as using such a retention barrier on a roll changer. In the drawings show:

FIGS. 1 to 3

an embodiment of the present invention with a retractable in a bottom recess, pivotable frame, on a roll changer;

FIG. 4

a second embodiment of a retaining device according to the invention with a curtain as a retention barrier; and

FIGS. 5 to 7

a third embodiment of a retaining device according to the invention with a aufspannbaren safety net.

In the figures, the reference numerals are used as follows, wherein like reference numerals indicate identical or functionally identical parts. A reel changer 10 (shown schematically) has a pivotal frame 29 with two arms 11 and 12, to which are attached two rollers 13, 14 of a web material (eg paper) to be unwound. On the lower arm 11, the outer contour is indicated by the reference numeral 16. The roll changer 10 has the largest pivoting circle 15, and it is housed between closing walls 20, 22 (closed side at the wall 20), while it is accessible from the side 21 ago.

Under the reel changer the retention barrier 9 is arranged in a bottom recess or pit 7, of which the rigid frame is designated 1. The frame 1 is rotatable about the pivot axis 2, with the help of the articulated at the pivot point 6 at the pit edge and the pivot point 5 on the frame 1 pneumatic cylinder 3, which in turn has an upper protective cover 8. Reference numeral 4 indicates a mechanical stop on the frame 1.

In the FIG. 2 is still the unwound from the roll 13 web 17 separately designated; also in the FIG. 3 ,

In addition to some of the above reference numerals, in the FIG. 4 (second embodiment) nor the designation 18, 19 for two rotary frame extensions before, and the reference numeral 31 for a designed as a retaining barrier 9 curtain with a mounted at one end end thickening 32, which serves as a weight and roll-lock. The curtain 31 is unwound from the housing 33 from a roller, which is indicated on the left of the still wound curtain with the reference numeral 35. He exits through a gap 34 from the housing 33.

Again in addition to some of the above-mentioned reference numerals come in the FIGS. 5 to 7 nor the designations 41 for a safety net, 42 and 43 for safety net tensioning supports, 44 and 45 for the pivot axes of the tensioning supports, 46 and 47 for cylinder bearing extensions on the tensioning supports and 48 and 49 for pneumatic cylinders.

In the following, the operation and the structure of the embodiment according to the FIGS. 1 to 3 explained in more detail. In general, it should be noted in advance that the figure 1 this shows a state in which two still fully wound rollers 13 and 14 are secured to the paster 10, wherein the roller 13 projects slightly into the pit 7 down. In the FIG. 1 the barrier 9 is not yet in use, but in its resting state or its rest position.

The Figures 2 and 3 each show conditions in which the roller 13 is almost completely unwound and therefore a burst protection is necessary. The barriers 9 are each moved into their working position and protect the space 21 from possibly flying parts of a bursting sleeve of the roller 13. In contrast to FIG. 2 where the arms of the rotating frame 29 are vertical, they stand in the FIG. 3 slightly tilted counterclockwise. The function of the mechanical stop 4 will be particularly discussed.

A restraint device according to the present invention as in one embodiment in the FIGS. 1 to 3 is shown, for example, consists of a rigid frame 1 with reinforcing ribs, with intermediate sheet-like elements are drawn from sheet metal or shatterproof plastic. Also net-like intermediate pieces are possible; the retaining surface of the retaining barrier 9 thus formed is not visible in the figures because it is perpendicular to the plane of the drawing.

The drive and the attachment for the retaining barrier 9 are in the pit 7 - a Bodenausnehmung - mounted and have no connection to the rotating frame of the roll changer 10. The arrangement in the pit 7 is a single retaining device for both Tragarmpaare or support arms 11, 12 of the Reel changer 10 necessary, each standing in the unwinding position in the working area of the restraint. For this reason, the necessary power and control cables do not have to be advantageously guided on the rotating frame 29.

The frame 1 is preferably mounted on its pivot axis 2 (eg two pivot points at the frame end), and it is driven by one or more linear drive elements, wherein a pneumatic cylinder 3 in the FIGS. 1 to 3 is shown. Alternatively, of course, a rotationally driven pivot axis 2 is possible in principle.

The pivoting movement of the retaining barrier 9 is in the in FIG. 1 Rest position shown limited by the mechanical stop 4, preferably two stop elements are provided laterally on the frame here.

As in particular from the in the Figures 2 and 3 shown different positions of the rotating frame of the roll changer 10, the latter is depending on the diameter of the neurole in the gluing in different angular positions. The inventive device takes into account these different positions by the interaction of the stops 4 and the outer contour 16 on the support arm 11 (corresponding to the arm 12). In the example shown, the geometries of the holding or supporting arms 11, 12 and the stops 4 are matched to the device so that the correct working position of the retaining barrier 9 is achieved mechanically predetermined, as shown in the Figures 2 and 3 shown at different angles.

By laterally extended stops 4, which extend to the support arms 11, 12, the pivoting movement can be limited to the working position. As shown ( FIG. 1 ), the mechanical stop for the rest position can also be realized simultaneously by the stop element 4, but this is not absolutely necessary; In principle, an additional stop element for the rest position can also be provided.

The drive is in this embodiment of the invention for the entire restraint very simple. Reaching or holding the rest position ( FIG. 1 ) is simply achieved by gravity independently, throttling the movement via a corresponding valve in the pneumatic cylinder 3 would be advantageous. At rest, the barrier 9 is safe, held by their own weight in the pit 7. The lifting movement into the working position is made by the single-acting cylinder 3 and can, as already explained above, easy be limited by stops in the way. No complicated control of the lifting movement is required.

According to a preferred embodiment, a triggering of the lifting movement is provided only for full-width rollers, because narrower roles have a much higher critical speed, which is not achieved at the web speeds of many machines.

The protective cover 8 ( FIG. 1 ) on the drive element 3 secures this and the power supply before sleeve fragments and makes the device at rest accessible. In this case, the device in the idle state is advantageously completely sunk in the pit, so that the largest pivoting circle 15 remains free for the loaded rotating frame 29.

It should also be noted that in an alternative embodiment, separate, multi-part restraint devices are conceivable that can be partially extended with individual drives.

The restraint device according to the alternative embodiment in FIG. 4 comprises a guide-less retaining curtain 31 and at least one retainer curtain 31 adjusting drive, which is mounted in the extensions or limbs 18, 19 of the rotary frame 29 in a housing 33 in which the curtain 31 can be rollably provided (reference numeral 35 on the left side ). In general, therefore drive and attachment to the rotating frame 29 are mounted or integrated in the rotating frame 29. The drive is preferably a rotary drive, but may also be basically a linear drive. The extension direction is not predetermined mechanically, it will be adjusted by the weight acting on the curtain 31 and the end piece 32. A control of the extension can take place depending on the paper width or sleeve length. When the roll changer 10 rotates, the curtain is used on the extremity 19, so that in each case the freely accessible space 21 is protected.

Such an advantageous embodiment without guides on a suspended curtain allows the extension of the restraint operation even if the access secured area has been injured, because an object or a person located in the extension area of the restraining curtain is not endangered by the extension - the drive force and the extension path are mechanically decoupled , In addition, when approaching an obstacle, the flexible retaining curtain can be delayed, deflected or stopped, while the drive can continue to the end position. In principle, it is possible to carry out the retaining curtain in one piece, but also separate, multi-part embodiments with individual drives that allow a partial extension, conceivable.

A third embodiment shown here is in the Figures 5 . 6 and 7 to see, with the FIG. 5 again represents a side view of the reel changer (see FIGS. 1 to 4 ) while the FIGS. 6 and 7 show a front view. In the third embodiment, the retaining barrier 9 is formed by a safety net 41, which in the Figures 5 and 6 is best seen and which is not held by a rigid frame, but by two tensioning supports 42 and 43. The supports 42 and 43 clamp the safety net, which may be, for example, a nylon net or a network of another stretchable material by a driving force is stretched and clamped, which is exerted during the erection of the safety net 41 by means of the cylinders 48, 49 and the supports 42, 43.

In the FIG. 5 is still seen that the two clamping posts 42, 43 are secured in the pit 7 to the pivot axis bearings 44 and 45, which are laterally offset from each other, so that the clamping posts 42 and 43, when they are tilted down, can come to lie next to each other. In this tilted or lying state, the clamping supports 42 and 43 outside the largest pivoting circle (interference circuit) 15 are arranged, as from a common consideration of Figures 5 and 7 evident. The pivot bearings 44, 45 need not necessarily be arranged laterally offset from each other; it basically exists also the possibility of performing the tension supports in the upper area cranked so that they do not interfere with each other when placing or tipping.

The erection process for the safety net 41 of the third embodiment of the invention can best be understood from the FIGS. 6 and 7 describe, which - as noted above - a front view of a roll changer 10, as shown in the FIGS. 1 to 6 is shown laterally. In the FIG. 7 the net is not shown because of the better representability; but it will be apparent that the two tensioning supports 42, 43 are pivotally mounted in the pit outside in the bearings 44 and 45 and tilted in the rest position inward on the ground. From this rest position, they can now be pivoted upright by means of the drive cylinders 48, 49, which are fastened to the floor and to the respective bearing lugs 46 and 47 of the supports 42 and 43, whereby they are indicated by the arrows (FIG. FIG. 7 ) follow suggested movements. When the cylinders 48 and 49 are then extended so that the tensioning supports 42, 43 protrude substantially vertically upwards, the safety net 41 is tensioned and can fulfill its protective function in its working position. The bearing lugs 46 and 47 on the clamping supports 42 and 43 are used in the illustrated embodiment advantageously still as stops on the vertical pit wall, so that the extension movement of the cylinder 48, 49 is precisely limited when the supports 42, 43 are upright. This ensures that the net 41 is stretched with sufficient tension and area, whereby overstraining can be avoided.

Overall, in both embodiments shown ( FIGS. 1 to 3 . 4 and 5 to 7 ) still note that according to the invention, the web 17 always runs on the side of the roll changer 10, which faces away from the accessible space 21, so that each retention barrier used substantially completely shield the space and thereby provide a very high level of security, without affecting the Passage of the train have to consider.

Claims (19)

Retaining device for sleeve fragments on a web offset printing reel changer (10) with a retaining barrier (9) which can be introduced between an unwinding roll (13) and the accessible free space (21) in front of the roll changer (10), characterized in that the retaining barrier (9 ) can be introduced on the side of the roll changer (10) which is opposite to the guide side for the web (17) to be unwound from the roll (13). Restraint device according to claim 1, characterized in that the restraint barrier (9) in its rest position, in which it is not in use, substantially in a bottom recess (7) below the reel changer (10) is arranged, from the rest position in their Working position is pivotable, in which it is introduced between the roller (13) and the free space (21). Retaining device according to claim 1 or 2, characterized in that the retaining barrier (9) is a substantially rigid, in particular at least partially rigidly supported on the circumference, retaining barrier (9). Retaining device according to one of claims 1 to 3, characterized in that the retaining barrier comprises a frame (1) which carries or encloses a retaining surface. Retaining device according to one of claims 1 to 4, characterized in that the retaining barrier (9) is not mechanically or kinematically connected to the reel changer pivotal frame (29). Retaining device according to one of claims 1 to 5, characterized in that the retaining barrier (9) is pivoted about at least one, preferably a single pivot axis, preferably driven by a linear drive element (3), especially a pneumatic or hydraulic cylinder. Retaining device according to claim 6, characterized in that the drive element (3) with the retention barrier (9) in one or the bottom recess (7) is arranged. Retaining device according to claim 6 or 7, characterized in that above the drive element (3) a protective hood (8) is arranged. Retaining device according to one of claims 1 to 8, characterized in that the retaining barrier (9) by means of a mechanical stop (4, 16) in the movement to the rest position and / or the working position is limited. Retaining device according to claim 9, characterized in that the stop (16) for the working position on the rotating frame (29) of the roll changer (10) is provided and depending on the rotary frame angular position provides a different, adapted working position of the retaining barrier (9). Restraint device according to claim 1, characterized in that the retaining barrier (9) has a roll changer (10) arranged curtain (31) which can be suspended in its working position. Retaining device according to claim 11, characterized in that the one- or multi-part curtain (31) is at least laterally substantially unguided, and in particular the extended working position of the curtain (31) positionally substantially mechanically not predetermined, especially free hanging. Retaining device according to claim 11 or 12, characterized in that on the rotating frame (29), in particular on a protruding into the free space, middle rotary frame extensions (18, 19), a winding or Raffvorichtung (35) is arranged for the curtain, especially together with a curtain drive, preferably a rotary curtain drive. Retaining device according to claim 13, characterized in that a winding or shirring device or a curtain drive are arranged on each side of the rotating frame (29) for each web roll (13, 14) to be unwound. Retaining device according to one of claims 11 to 14, characterized in that the curtain (31) comprises a continuous or perforated sheet material, in particular tissue or foil-like or chain, lamella or rod curtain-like design. Retaining device according to claim 1, characterized in that the retaining barrier (9) has an erectable, in particular aufspannbares safety net (41). Restraint device according to claim 16, characterized in that the restraint barrier (9) in its rest position, in which it is not in use, substantially in a bottom recess (7) below the reel changer (10) is arranged, from the rest position in their Working position is erectile, in which it is introduced between the roller (13) and the free space (21). Retaining device according to claim 16 or 17, characterized in that the safety net (41) of the restraining barrier between two erectable supports (42, 43) can be tensioned, which are pivotally erectable, in particular by means of one or more linear drive elements (48, 49), especially pneumatic or hydraulic cylinders. Retaining device according to one of claims 16 to 18, characterized in that the safety net (41) comprises a stretchable material, in particular a Nylon material, which is stretched and / or stretched when erecting the retaining barrier (9).

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