EP1099655A2 - Device for guiding a laterally stable web - Google Patents

Abstract

The arrangement has several rollers that can be pressed against the material, are independently rotated, can be placed on the material approximately centrally, can be displaced transversely to the direction of material motion, are pivotably mounted and are opposite a support consisting of pivotably mounted counter rollers movable transversely to the strip movement direction. The material is clamped between the rollers and counter rollers. The arrangement has several axially aligned rollers (3) that can be pressed against the material (2), are independently rotated, can be placed on the material approximately centrally, can be displaced transversely to the direction of motion of the strip material, are pivotably mounted and are opposite a support (13) for the material strip consisting of several pivotably mounted counter rollers (4) movable transversely to the strip movement direction (7). The material strip is clamped between the rollers and counter rollers. Independent claims are also included for the following: a method of transporting a transversely stable material strip.

Description

The invention relates to a device for guiding transverse stable web, in particular a paper, cardboard, Corrugated cardboard or plastic sheet according to the generic term of claim 1. The invention also relates according to a method for guiding such a path the preamble of claim 8.

EP 0 519 261 B1 describes a device for guiding a transverse stable web known, the multiple, across has rollers spaced apart from the direction of web travel. These roles are held in a fork, which by one swivel axis perpendicular to the web by means of a Actuator is pivotable. By swiveling the rollers by means of the actuator can the roller axes at an acute angle to the direction of the web aligned so that the rolls on the web exert a lateral force which leads to guidance the web is used. To have sufficient leadership to achieve through the roles, it is necessary this with an appropriate force against the web to press. That's why on the opposite side of the web a stationary edition is provided which the web of goods supports. This known device for guiding transverse stable web has proven itself in practice, provided the necessary side managers, that are to be brought into the web are sufficient were small. Especially in the area of rip knives or scoring this device has however as proven to be in need of improvement, since the in the web immersing cutting knife or scraper such a large one Apply lateral force to the web so that the rollers also greatest possible contact pressure and maximum inclination the web is no longer sufficient for the direction of the web can quickly bring them to their target position.

The invention has for its object a device of the type mentioned at the outset to create a offers improved leadership and in particular also Can be used in the area of cutting knives or scoring machines is. A method for guiding a material web is also intended be created, the rapid compensation of a occurred course of the course allowed.

This object is achieved with the features of Claim 1 and with the process steps of Claim 8 solved.

The device according to claim 1 has several against Material web pressable rolls on which several counter rolls opposite. Both the roles and the counter roles are rotatably mounted independently of each other, so that seen the web in the direction of travel almost none Show resistance. The roles and the counter roles can be moved across and around the web one directed essentially perpendicular to the plane of the web Axis pivoted so that the rollers and the counter rollers when moving and pivoting on the Material web directed perpendicular to its direction Exercise leadership. Because the web between the rolls and the counter rollers are held in the clamping handle relatively large holding forces can be achieved without the To prevent the web from running due to excessive friction. In contrast to a fixed support, which by the frictional forces acting on the web are both Support the web run as well as the web guidance the counter roles the effect of the roles due to it Slidability and pivotability, so that on the web exercised an unexpectedly large lateral executive can be. This device is located in the area of a cutting knife cutting lengthways through the material web or a scraper, so the cutting knife or creases exerted on the web by this device can still be compensated so that the material web almost except for a small edge area can be fully exploited. How many roles and Counter rollers are used depends in particular on the Web width and their physical properties and is therefore individual in the respective application fixed. In particular, corrugated cardboard webs may only be used limited contact pressure of the rollers can be loaded without to be permanently damaged. The width of the Rolling, however, leads to undesired pivoting Shear forces acting on the web and could damage them. It is therefore in this In case it is cheaper to use several rollers and counter rollers, which are kept axially aligned and independent of each other are rotatable. So that when swiveling the rollers and counter rollers the one in the inner circle Roll correspondingly slower than the one in the outer circle rotate, eliminating the unwanted shear forces stay small. The web is cut by a cutter cross-cuts what, for example, at a Splice in the web must be done, so that will be tapering and tapering end of the web due to their free end is not held exactly in their position. Due to the clamping handle of the center Guide or counter roles are sufficient safe management effect on the web, so that such, severed web pieces are correct be performed. So that these end or beginning pieces a web of goods can be used almost completely, so that the resulting waste is reduced accordingly becomes. This increases the efficiency of the entire system.

Because the counter roles support the leadership effect of the roles it is appropriate if the roles and Counter rollers can be adjusted synchronously to each other. Basically could the roles and the counter roles over each an actuator can be adjusted, the corresponding Synchronization means synchronized with each other become. However, it is easier if the counter rollers with the rollers according to claim 2 via a gear, preferably a linkage, in operative connection with one another stand. In this case, the roles are adjusted and the counter rollers from a common actuator and inevitably in sync. Since only one Actuator is required, also simplifies the control of the swivel unit.

A sufficient pressure regardless of the web thickness being able to exercise on the track are the roles against that Adjustable web. The roles are accordingly on the one hand by an approximately vertical to the web level directional axis swiveling and on the other hand vertical adjustable to the web level, so that they have two Degrees of freedom. Opposite are the opposite roles according to claim 3 only about a fixed axis pivoted so that it is not particularly vertical are adjustable to the web level. The counter roles therefore have only one degree of freedom. This ensures that the web is independent of the set Contact pressure of the rollers no movement executes perpendicular to the web plane. This is particularly so important for corrugated cardboard webs, as these are to avoid of damage in one level if possible without any redirection should be carried out. Since the Swivel axis of the counter rollers from their axis in the direction of web travel spaced apart causes pivoting the counter-rollers around this pivot axis a simultaneous Displacement of the counter rollers transversely to the direction of web travel. This shift results in a particularly effective web run correction.

So that the counter roles the leadership effect of the roles as possible can optimally support, it is according to claim 4 advantageous if it can be pivoted about a common axis are held. This ensures that the roles and the counter rollers exactly in each swivel position opposite, so that the web is always optimal is held in the clamping handle.

Because the rollers with considerable pressure on the counter rollers concerns, it occurs especially at the beginning of a new web to a traffic jam effect in the area of Roll. Since the web at splicing points in general is severed, is such a build-up in the production process the web relatively often. It is therefore favorable according to claim 5, at least one of the roles or To drive counter rollers for rotation, so that this on the Goods web has a propulsive effect and a stowage of the Web is reliably prevented.

Basically, it would be beneficial to have multiple or all roles or to drive counter rollers. However, the roles rigidly coupled to a common rotary drive, so the individual roles could no longer be independent from each other at different speeds rotate, so the advantage of using single rolls would be lost instead of a wide roller. It is therefore cheap according to claim 6, the roles or counter roles keep frictional on a common shaft which is driven by a rotary drive. By the frictional contact between the rollers and the shaft transfer the torque of the rotary actuator, while still each role is different Can have speed. Preferably the space between the shaft and the rollers with one tough as possible Filled in bold that an optimal transfer of the Torque of the shaft ensures. Alternatively, the Shaft can also be magnetized, with the roller bearings in this case are made of highly conductive metal. The rotating shaft creates a rotating magnetic field which again induced a magnetic vortex field in the rollers, with which the torque of the shaft without rigid coupling the roles can be transferred.

Basically, the rollers could be countered by means of a spring the web are pressed. According to claim 7 however, it is advantageous to use an actuator preferably a pneumatic cylinder against the web to press. This allows the pressure of the rollers can be adjusted sensitively on the web, so that the device for different webs can be used. The pressing force is, for example by changing the pressure in the pneumatic cylinder accordingly customized. In particular, it is thought how to measure the web thickness or web width and from this a favorable pressing force of the rollers calculate that set automatically by means of the actuator becomes.

In the method according to claim 8 is a cross-stable Web in the area of a knife or scraper. The knife or scraper exert considerable lateral forces on the web, so that correspondingly high Managers exerted to balance these side forces Need to become. For this, the method provides for Claim 8 before that several roles in the middle of the The web is put on and pressed against it Opposing rollers are opposite. Due to the central location of the Rolling in counter rolls becomes their pulling and pushing effect optimally used on the web so that there is a favorable web run correction results. The roles and the counter roles are synchronous to each other across the web direction moved or pivoted so that the roles and counter roles together a corresponding, across Web direction directional positioning force on the web exercise. By synchronously swiveling roles and Counter roll is also ensured that the web in any swivel position of the rollers or counter rollers in Clamp handle is held, which is different from the rollers and the actuating force exerted on the counter rollers is increased accordingly. This can be achieved by the roles and the counterforce exerted on the web of positioning force is greater than the lateral force of the knife or Rillers, so that also in the area of the knife or Rillers an exact guidance of the web is guaranteed. In order to guide hooks that damage the web edges, that have been used in this area so far are no longer applicable. By guiding the web precisely, it can also used up to a small edge area what reduces the waste accordingly.

To ensure an exact web run under all production conditions ensure, it is favorable according to claim 9, measure the course of the path and by shifting or Swiveling the roles and the counter roles on one To regulate the setpoint.

Due to the particularly strong lateral forces of the knives or creases result in their adjustment across Web running direction especially large web runs that only are difficult to correct. In this case it is according to claim 10 advantageous for a lateral shift the knife or creaser the resulting path to be calculated and taken into account in web guiding. This results in a particularly quick compensation the course of the path, especially since the rollers or counter rollers can already be pivoted before the expected path can be measured. Also reduced this measure of the Grooving caused the course of the web because the rollers or Counter-rollers already when moving the knife or scraper at a corresponding angle to the direction of web travel are set. So that's the knife or scraper caused path course correspondingly lower.

In the production process of the web it is important that the cutting knives or creases on the web as far as possible cut through the specified position. This is according to claim 11 realized in the simplest way by that the setpoint of web guiding depends on the location the knife or scraper is dependent. Preferably as a setpoint directly the position of the knife or scraper proportional measured value used.

To achieve an optimal cut or a correct one Grooving of the web is according to claim 12 advantageous, the knife or the scraper by means of control to track the position of the web edge or a print mark. In the case of a lateral course of the path, that is Knife or scraper moved laterally accordingly, so that the cut or scoring despite the course of the web is done correctly. In addition, the web through the action of the inclined rollers and counter rollers brought back to their starting position or at least so far that a further course is prevented.

The subject of the invention and the method according to the invention are explained using the drawing as an example, without restricting the scope of protection.

Figur 1

eine Schnittdarstellung einer Vorrichtung zum Führen einer Warenbahn,

Figur 2

eine Ansicht der Vorrichtung gemäß Figur 1 von oben,

Figur 3

eine Schnittdarstellung der Vorrichtung gemäß Figur 1 entlang der Schnittlinie III-III und

Figur 4

eine Ansicht der Vorrichtung gemäß Figur 1 entgegen der Warenbahnlaufrichtung mit schematischer Darstellung einer Regeleinrichtung.

It shows:

Figure 1

2 shows a sectional illustration of a device for guiding a material web,

Figure 2

2 shows a view of the device according to FIG. 1 from above,

Figure 3

a sectional view of the device of Figure 1 along the section line III-III and

Figure 4

a view of the device of Figure 1 against the direction of the web with a schematic representation of a control device.

A device 1 for guiding a cross-stable web 2 according to FIG. 1 has several rollers 3 and counter rollers 4 on. The rollers 3 and counter rollers 4 consist of Plastic, especially polyurethane and are up to one elastically deformable to a certain degree. This deformability is through the formation of the roles 3 or counter roles 4 with thin, non-radial spokes 5 additionally increased. So that the rollers 3 and counter rollers are 4 on the web 2 flat and not linear so that the contact pressure of the rollers 3 and Counter rollers 4 on a correspondingly larger area Goods web 2 distributed. This reliably prevents one Damage to the web 2 even when introducing relative large pressure forces of the rollers 3.

The rollers 3 are freely rotatable on axes 6, so that it runs from the web running in the direction of 7 to Rotation are driven. The axes 6 are in forks 8 held in a pivot bearing 9 of a recording 10 are pivotally supported. The forks 8 are from a pneumatic cylinder 10` pressed against the web 2, the pressing force by the pneumatic cylinder is adjustable. Alternatively, the forks 8 could also be pressed against the web 2 by a spring.

The receptacle 10 is held on a pivot pin 11 which is in turn pivotally supported in a frame 12. This frame 12 is held stationary over the web 2. For swiveling the rollers 3 around a vertical one Axis A of the pivot pin 11 engages in the receptacle 10 Actuator via a linkage, not shown. This allows the rollers 3 on the one hand on the pivot bearing 9 pressed against the web 2 and on the other hand around the vertical axis A of the pivot pin 11 is actively pivoted become. Take the rollers 3 one at an acute angle to the web direction 7 facing position, so practice this on the web 2 in a direction transverse to the web direction 7 directed force.

An abutment 13 is located exactly opposite the rollers 3 provided in the form of counter rollers 4, which are essentially are the same as the rollers 3 are formed. These roles 4 are rotatably held on a common shaft 14, which is supported in a fork 15. This fork 15 is held directly on a pivot pin 16, the Axis is aligned with the axis A of the pivot pin 11. The Pivot pin 16 is rotatably supported in a frame 17, which is held stationary under the web 2.

In order to be able to regulate the web 2 in its position a camera 20 schematically indicated that either the Web edge or a marking printed on the web recorded and as the actual value of a control device passes on. Immediately behind the camera 20 a cutting knife 21, which is transverse to the direction of travel of the web 7 is slidably and the web 2 cut lengthways. Alternatively or in addition in this area also a scoring 22 can be provided, the compresses the web 2 more permanently in the running direction 7, a later folding of the web 2 on this Enable line. Both the cutting knife 21 and the Riller 22 also practice when moving them transverse to the web direction 7 considerable lateral forces on the web 2 from the device 1 must be balanced.

Figure 2 shows a view of the device 1 from above. The structure of the Fork 8 with the pivot bearing 9 out. Training the Fork 8 with three rollers 3 held thereon is only exemplary and depends in particular on the width and the physical properties of the web 2. It is also conceivable, alternatively only one or two or to provide more than three roles 3. The roles 3 can Pivot bearing 9 together or independently against each other the web 2 can be pivoted. In the latter case a separate spring is provided for each roller 3, which is biased against the web 2. Finally the course of the cutting line follows from this representation I-I for the sectional view according to FIG. 1.

Figure 3 shows a sectional view through the device according to Figure 1 along the section line III-III. in the Contrary to the holder of the rollers 3 are the counter rollers 4 held only pivotable about the pivot pin 16, so that the counter rollers 4 in particular none perpendicular to Plane extension of the web 2 directional movement can execute. The counter rollers 4 are also on the common shaft 14 held rotatable in the fork 15 is supported. The shaft 14 is driven by a rotary drive 25 rotated, the space between the Shaft 14 and the counter rollers 4 filled with a viscous grease is. This fat transmits the torque that is exerted on the shaft 14 by the rotary drive 25 the counter rollers 4 without a rigid coupling of the counter rollers 4 cause. The counter rollers 4 therefore practice the web 2 is directed in the web running direction 7 Driving force, so that especially at the beginning of a Material web 2 no jam in the area of the rollers 3 and counter rollers 4 arises. As an alternative to the representation according to FIG 3 could also provide more or fewer counter rollers 4 his. In particular, more counter rollers 4 than rollers 3 can be provided to the effect of the abutment 13 improve.

FIG. 4 shows a schematic view of the device 1 against the direction of the web 7. At the holder 10 and on the frame 15 a schematically shown grips Linkage 30, which is a synchronization of the Swiveling movements of the counter rollers 4 with the rollers 3 causes. The linkage 30 is moved by an actuator 31 which is exemplified as a hydraulic cylinder is. Alternatively, any other drive, for example in the form of an electric motor.

In order to achieve correct guidance of the web 2, is a control device 32 is provided which is based on a signal is influenced, which is captured by the camera 20. This camera signal becomes an inverting input of a Summers 33 fed, its non-inverting Input receives a setpoint 34. The output side is the Summer 33 connected to a control amplifier 35, the preferably has a P, PI or PID behavior. The Control amplifier 35 in turn controls a servomotor 36 to the cutting knife shown only in Figure 1 21 or Riller 22 moved laterally. With that the cutting knife 21 or scraper 22 each of the web edge or a marking line printed on the web tracked so that a correct cut or correct scoring is given.

The displacement of the cutting knife 21 or scraper 22 causes however, a corresponding path of the web 2, which the device 1 counteracts. For this is the output signal of the control amplifier 35 with a the non-inverting input forming the setpoint input a further summer 37 connected, its inverting Input fed with the signal of the camera 20 becomes. This summer 37 is on the output side a control amplifier 38, which is also preferably has a P, PI or PID behavior. This Control amplifier 38 controls the servomotor 31, which the Rollers 3 and counter-rollers 4 pivoted over the linkage 30 and thus counteracts the measured path.

Reference list

1

contraption

2nd

Goods web

3rd

role

4th

Counter role

5

spoke

6

axis

7

Direction of the web

8th

fork

9

Swivel bearing

10th

admission

10`

Actuator

11

Pivot pin

12th

frame

13

Abutment

14

wave

15

fork

16

Pivot pin

20th

camera

21

Cutting knife

22

Riller

25th

Rotary drive

30th

Linkage

31

Servomotor

32

Control device

33

Totalizer

34

Setpoint

35

Control amplifier

36

Servomotor

37

Totalizer

38

Control amplifier

A

axis

Claims (12)

Device for guiding a cross-stable web (2), in particular a paper, cardboard, corrugated or plastic web, the device (1) having a plurality of axially aligned rollers (3) that can be pressed against the web (2) and can be rotated independently of one another , which can be placed approximately in the middle of the web (2) and are displaceable and pivotable transversely to the web running direction (7), and which is opposite an abutment (13) supporting the web (2), characterized in that the abutment (13) from A plurality of axially aligned counter-rollers (4) which can be rotated independently of one another is formed and can be displaced and pivoted transversely to the web running direction (7), the web (2) being held in the clamping handle between the rollers (3) and the counter-rollers (4) . Device according to claim 1, characterized in that the counter-rollers (4) are operatively connected to one another by means of a gear (30) and can be displaced and / or pivoted by a common actuator (31). Apparatus according to claim 1 or 2, characterized in that the counter-rollers (4) are mounted in a holder (15) which can be pivoted about a fixed axis (A) spaced from the counter-roller axis (14) in the web running direction (7) and otherwise is immobile. Device according to at least one of claims 1 to 3, characterized in that the rollers (3) and the counter rollers (4) are held so as to be pivotable about a common axis (A). Device according to at least one of claims 1 to 4, characterized in that at least one of the rollers (3) and / or counter rollers (4) is / are driven to rotate. Apparatus according to claim 5, characterized in that at least two of the rollers (3) and / or counter rollers (4) are in frictional contact with a common shaft (14) which is driven by a rotary drive (25). Device according to at least one of claims 1 to 6, characterized in that the rollers (5) can be pressed against the web (2) by an actuator (10 '), the pressing force of the rollers (5) being adjustable. Method for guiding a cross-stable web (2), in particular a paper, cardboard, corrugated cardboard or plastic web, in the area of a cutting knife (21) that cuts lengthways through the web (2) or longitudinally folding scraper (22), in which several, independently Axially aligned rollers (3) which can be rotated from one another are placed approximately in the center of the web (2), pressed against it and displaced and pivoted transversely to the web running direction (7), characterized in that the web (2) is supported by a plurality of rollers ( 3) opposite, independently rotatable counter-rollers (4) is supported, which are moved and pivoted synchronously with the rollers (3), the web (2) being held between the rollers (3) and the counter-rollers (4) in the clamping handle. Method according to claim 8, characterized in that the displacement and pivoting of the rollers (3) and the counter-rollers (4) takes place as a function of a measured path course by means of control. A method according to claim 9, wherein the cutting knife (21) and / or the creaser (22) is held transversely displaceable, characterized in that when the cutting knife (21) and / or the creaser (22) is displaced, the resulting path course is calculated and is taken into account in web guiding. A method according to claim 9 or 10, characterized in that the setpoint of the web guiding is dependent on the position of the cutting knife (21) and / or creaser (22). Method according to at least one of claims 8 to 11, characterized in that the cutting knife (21) and / or the creaser (22) is adjusted by regulating the position of a web edge or a marking printed on the product web (2).

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