EP1099655B1 - Device and method for guiding a laterally stable web - Google Patents

Abstract

The device (1) has roller (3) held, transversely movable, in the area of a cutter (21), which cuts the material flow line (2) longitudinally, and/or groove (22), which grooves the material flow line longitudinally. An independent claim is also included for a method for guiding of cross-sectionally stable material flow line.

Description

The invention relates to a device for guiding a transverse stable web, in particular a paper, board, Corrugated or plastic sheet according to the preamble of patent claim 1. Furthermore, the invention relates a method for guiding such a web according to the preamble of claim 6.

EP 0 519 261 B1 discloses a device for guiding a transverse stable web known, the several, transverse Having rollers for the web direction of travel spaced. These roles are held in a fork, which is around a perpendicular to the web standing pivot axis by means of a Actuator is pivotable. By pivoting the rollers by means of the actuator, the roller axes at an acute angle to the web direction of travel be aligned so that the rollers on the web exert a lateral force, which leads to leadership the web is used. To provide adequate leadership to achieve through the roles, it is necessary this with a corresponding force against the web to press. At the web counterpart is therefore a stationary support provided, which is the web supported. This known device for guiding a Querstabilen web has been proven in practice, provided the necessary lateral managers, which are to be introduced into the web, sufficient were small. Especially in the field of slitting knives However, this device has been known as scoring or scoring to be improved, since that is in the web dipping cutting knife or riller such a big one Side force on the web exercise that the rollers also at maximum contact pressure and maximum inclination to web run direction, the web is no longer sufficient can bring quickly into their desired position.

From US 3,147,898 A is a guide device for a running track known. This consists of two top sides Rolls which can be placed on the web in the edge region, those on the underside of the web corresponding Opposite roles opposite. The roles and counter roles are held pivotable about respective common axes, so that they are employed at an angle to the web running direction can be. In this way, there is a cross to the Web running direction running force, the web guiding influence can be used.

From EP 0 697 361 A is a further web guiding device known by several, on the web attached roles and counter-roles is formed. The counter-rolls are driven by drives that everyone assigned to each counter-role. Through these drives can the individual counter roles with different Speeds are driven, so that on this Way the web is forced into a sheet course. The However, rollers and counter-rollers can not be swiveled. The rollers and counter rollers is a cross cutting device downstream, which cuts across the current web across.

The invention is based on the object, a device to create the type mentioned, the one offers improved leadership and in particular also Can be used in the field of cutting knives or scrapers is. In addition, a method for guiding a web be created, which is a quick compensation of a occurred trajectory allowed.

This object is achieved according to the invention with the features of Patent claim 1 and with the method steps of Patent claim 6 solved.

The device according to claim 1 has several, against the Web press on rollers, which several counter-rollers are opposite. Both the roles and the counter roles are independently rotatably mounted, so that they the web in the direction seen almost no To resist. The rolls and the counter rolls are transverse to the web running direction to a substantially axis directed perpendicular to the web plane pivotable held so that the rollers and the counter-rollers when pivoting on the web a perpendicular to to exercise their direction. There the web between the rollers and the counter rollers in the Clamping handle is held, relatively large holding forces be achieved without the web due to excessive friction hampered in their course. Unlike one fixed support, which acts by the web on the web Frictional forces both the web and the web guide hindered, the counter-roles support the effect the roles due to their pivotability, so that on the web an unexpectedly large lateral leadership can be exercised. Is this device in the region of a web longitudinally severing Cutting knife or a riller, so can the from Cutting knife or riller applied to the web Lateral force of this device balanced anyway be so that the web to a small edge area can be almost completely exploited. How many roles and counter-roles are used depends in particular of the web width and their physical Properties and is therefore in the particular application individually determined. In particular corrugated cardboard sheets may only with limited contact pressure of the Rollers are charged without being permanently damaged. Too large a width of the rollers, however, leads to their Pivoting to undesirable shearing forces on the web could act and damage them. It is therefore cheaper in this case, several roles and Use counter rollers, which are held axially aligned and are independently rotatable. This can when pivoting the rollers and counter rollers each in the inner circle corresponding role slower than that rotate in the outer circle, eliminating the unwanted Shear forces remain small. Is the web of a Cutting device cut across, which, for example take place at a splice in the web must, so are the leaking as well as tapered tail the web due to their free end not exactly in their location. Due to the clamping grip of the center attached guide or counter roles arises, however a sufficiently secure guiding effect on the web, so that such, severed web pieces be guided correctly. Thus, these final or initial pieces of a material web practically complete be used so that the resulting waste accordingly is reduced. This increases the economic efficiency the entire plant. Because the roles with a considerable Pressure is applied to the counter-rollers, it comes in particular at the beginning of a new web to a jamming effect in the field of roles. As the web at Splices is generally severed, is one such Damping in the production process of the web relatively often. It is therefore favorable, at least one of To drive rollers or counter-rollers for rotation, so that this has a propulsive effect on the web and a Stowage of the web is reliably prevented. Basically, it would be beneficial to have several or all roles or counter-rolls to drive. However, the roles become 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 roles lost instead of a wide roller. It is Therefore favorable, the rollers or counter-rollers on one frictionally to keep common shaft of a Rotary drive is driven. Due to the frictional contact between the roles and the wave becomes the torque of the Rotary drive transferred, while still the individual Rolls can each have a different speed. Preferably, the space between the shaft and the roles filled with the toughest possible fat, the ensures optimal transmission of the torque of the shaft. Alternatively, the wave could also be magnetized be, in which case the roller bearings of good conductive Metal are made. The rotating shaft generates a magnetic rotating field, which in turn is a magnetic Vortex field induced in the rollers, with which the Torque of the shaft without rigid coupling of the rollers can be transferred.

Because the counter-rollers support the guiding effect of the rollers should, it is useful if the roles and Counter rollers are synchronized with each other synchronously. in principle could be the roles and the counter-roles about each an actuator can be adjusted, the corresponding Synchronization means synchronized with each other become. But it is easier if the counter-rolls with the rollers according to claim 2 via a transmission, preferably a linkage, in operative connection with each other stand. In this case, the adjustment of the roles takes place and the counter rolls of a common actuator and inevitably in sync. Because only one Actuator is required, also simplifies the control of the pivoting unit.

Regardless of the web thickness sufficient pressure to be able to exercise on the track, the roles are against the Web held adjustable. The roles are accordingly on the one hand to an approximately vertical to the fabric level directed axis pivotally and vertically adjustable to the fabric level, so that they have two Have degrees of freedom. Opposite these are the counter-roles according to claim 3 only about a fixed axis pivotally mounted so that they are not vertical in particular are adjustable to the fabric level. The counter-rolls therefore possess only a single degree of freedom. This ensures that the web is independent of the set Contact pressure of the rollers no movement perpendicular to the fabric level. This is special important in corrugated board, as this to avoid of damage in as one plane as possible without any deflections should be made. Because the Swivel axis of the counter-rollers of their axis in the web running direction is spaced, causing a pivoting the counter-rollers around this pivot axis a simultaneous Displacement of the counter rollers transversely to the web running direction. This shift results in a particularly effective web running correction.

So that the counter-rollers the leadership effect of the roles as possible optimal support, it is according to claim 4 advantageous if these pivotable about a common axis are held. This ensures that the roles and the counter-rollers in each pivotal position exactly one another opposite, so that the web always optimally held in the clamping grip.

Basically, the rollers could by means of a spring against the web are pressed. According to claim 5 is However, it is advantageous to the rollers by an actuator, preferably a pneumatic cylinder against the web to press. Thus, the pressing force of the rollers be sensitively adjusted on the web, so that the device for a variety of webs can be used. The pressing force is, for example by changing the pressure in the pneumatic cylinder accordingly customized. In particular, it is intended to use orbital parameters, how to measure the web thickness or web width and from this a favorable pressure force of the rollers calculate, which automatically adjusted by means of the actuator becomes.

In the method according to claim 6 is a transversely stable Web run in the range of a knife or Rillers. The knife or the Riller practice while considerable lateral forces on the web, so that correspondingly high Executives applied to compensate for these lateral forces Need to become. For this purpose, the method according to Claim 8, that a plurality of rollers approximately in the middle of the Cloth web placed and pressed against this, the Opposite roles opposite. Due to the central location of the Rolls in counter rolls become their pulling and pushing action optimally utilized on the web, so that a cheap web correction results. The rolls and the counter rolls become synchronous with each other across the direction of web travel moved or pivoted so that the rollers and counter-roles together a corresponding, across to Web running direction directed force on the web exercise. Through the synchronous pivoting of roles and Counter rolls is also ensured that the web in each pivotal position of the rollers or counter rollers in the Clamping handle is held, which eliminates the rollers and the counter-rollers applied force increased accordingly. This can be achieved that of the roles and the counter rollers on the web exerted 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 can the web edges damaging guide hook, which have been used in this area so far, omitted. By accurately guiding the web, this can also exploited except for a small edge area which reduces the waste accordingly.

To achieve an exact web run under all production conditions to ensure it is favorable according to claim 7, to measure the trajectory and by displacement or Pivoting the rollers and the counter rollers to one Setpoint to regulate.

In the production process of the web, it is important that the cutting knife or Riller the web as possible cut the prescribed place. This is according to claim 8 realized in the simplest way, that the target value of the web guiding from the position of Knife or riller is dependent. Preferably, as Setpoint directly to the position of the knives or Riller proportional Measured value used.

To achieve an optimal cut or a correct Grooving the web it is advantageous according to claim 9, the knife or the Riller by regulating the Track position of the web edge or a print mark nachzuführen. In a lateral course of the track is therefore the knife or the Riller moved accordingly laterally, so that the cut or the grooving despite course of the course correct is made. In addition, the web is through the Effect of the inclined rollers and counter-rollers again brought back to their original position or at least that way far held that further course prevented becomes.

Due to the particularly strong lateral forces of the knives or Riller arise in their adjustment across the Web running direction particularly large trajectories, the only difficult to correct. In this case, it is according to claim 10 advantageous in a lateral displacement the knife or Riller the resulting trajectory to calculate and take into account in the web guiding. This results in a particularly rapid compensation the course of the track, especially the rollers or counter-rollers already be pivoted before the expected trajectory can be detected by measurement. Also reduced by this measure of the knives or Rillern caused trajectory, since the roles or Counter rolls when moving the knife or Riller already in a corresponding angle to the web running direction are set. This is the one of the knives or rillers caused trajectory correspondingly lower.

The subject invention and the inventive method are explained by way of example with reference to the drawing, without limiting 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:

FIG. 1

a sectional view of a device for guiding a web,

FIG. 2

a view of the device according to Figure 1 from above,

FIG. 3

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

FIG. 4

a view of the device according to Figure 1 opposite to the web running direction with a schematic representation of a control device.

A device 1 for guiding a transverse stable web 2 according to FIG. 1 has a plurality of rollers 3 and counter rollers 4 on. The rollers 3 and counter rollers 4 consist of Plastic, especially polyurethane and are up to a certain degree elastically deformable. This deformability is due to the formation of the rollers 3 or Gegenrollen 4 with thin, not radially extending spokes 5 additionally increased. This is the roles 3 and counter-roles 4 on the web 2 areal and not linear on, so that the contact pressure of the rollers 3 and Counter rollers 4 on a correspondingly larger area of Web 2 distributed. This reliably prevents a Damage to the web 2 even when introducing relative large pressure forces of the rollers 3.

The rollers 3 are freely rotatably mounted on axes 6, so that they from the running in the direction 7 web 2 for Rotation are driven. The axles 6 are in forks 8 held, which in a pivot bearing 9 a recording 10 are pivotally supported. The forks 8 are from a pneumatic cylinder 10 'pressed against the web 2, wherein the pressing force by the pneumatic cylinder is adjustable. Alternatively, the forks 8 could be too be pressed by a spring against the web 2.

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

The rollers 3 exactly opposite is an abutment 13th provided in the form of counter-rollers 4, which are substantially are formed equal to the rollers 3. These rollers 4 are rotatably supported on a common shaft 14, which is supported in a fork 15. This fork 15 is held directly on a pivot pin 16 whose Axis with the axis A of the pivot pin 11 is aligned. Of the Pintle 16 is rotatably supported in a frame 17, which is held stationary under the web 2.

To be able to control the web 2 in their position is a camera 20 schematically indicated that either the Web edge or a printed on the web marking detected and as an actual value of a control device passes. Immediately behind the camera 20 is located a cutting blade 21, which transverse to the web direction of travel 7 is slidably held and the web 2 longitudinally severed. Alternatively or additionally In this area, a riller 22 may be provided, the compresses the web 2 in the direction 7 more durable, to a subsequent folding of the web 2 at this To enable line. Both the cutting blade 21 as The Riller 22 also practice their displacement transversely to the web running direction 7 considerable lateral forces on the web 2 made by the device 1 must be balanced.

Figure 2 shows a view of the device 1 from above. From this representation goes in particular the structure of the Fork 8 with the pivot bearing 9 forth. The training of Fork 8 with three rollers 3 held on it is only exemplary and depends in particular on the width and the physical properties of the web 2 from. It is also conceivable, alternatively only one or two or to provide more than three rollers 3. The rollers 3 can in Swivel 9 together or independently against the web 2 be pivoted. In the last case is a separate spring provided for each roller 3, which is biased against the web 2. After all goes from this representation of the course of the cutting line I-I for the sectional view of Figure 1 shows.

FIG. 3 shows a sectional view through the device according to Figure 1 along the section line III-III. in the Contrary to the support of the rollers 3 are the counter-rollers 4 only held pivotally about the pivot pin 16, so that the counter-rollers 4 in particular no perpendicular to Plane extension of the web 2 directed movement can execute. The counter rolls 4 are also on the common shaft 14 held in the fork 15 rotatable 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 tough fat is. This grease transfers the torque, the is exerted by the rotary drive 25 on the shaft 14, on the counter-rollers 4, without a rigid coupling of the counter-rollers 4 cause. The counter-rollers 4 therefore practice the web 2 directed in web direction of travel 7 Driving force, so that in particular at the beginning of a Web 2 no jam in the area of the rollers 3 and counter rolls 4 arises. Alternatively to the illustration according to FIG 3 could also provide more or fewer counter-rollers 4 be. In particular, more counter rollers 4 than rollers 3 may be provided to the effect of the abutment 13 to improve.

FIG. 4 shows a schematic view of the device 1 against the web running direction 7. On the recording 10th and on the frame 15 engages in each case a schematically illustrated Linkage 30, which is a synchronization of the Pivoting movements of the counter-rollers 4 with the rollers 3 causes. The linkage 30 is moved by a servomotor 31, exemplified as a hydraulic cylinder is. Alternatively, any other drive, for example in the form of an electric motor.

To achieve a correct guidance of the web 2 is a control device 32 is provided, which is a signal is affected, which is detected by the camera 20. This camera signal is an inverting input of a Summier 33 supplied, whose non-inverting Input receives a setpoint 34. On the output side is the Totalizer 33 connected to a variable gain amplifier 35, the preferably has a P, PI or PID behavior. Of the Control amplifier 35 in turn controls a servomotor 36 on, the only shown in Figure 1 cutting blade 21 and Riller 22 moved laterally. With that the cutting blades 21 and Riller 22 each of the web edge or a marking line printed on the web tracked so that a correct cut or a correct grooving is given.

The displacement of the cutting blade 21 or Riller 22 causes However, a corresponding trajectory of the web 2, which counteracts the device 1. For this is the output signal of the control amplifier 35 with a the setpoint input forming non-inverting input another summer 37 connected, whose inverting Input with the signal of the camera 20 fed becomes. This summer 37 is output with connected to a variable gain amplifier 38, which also preferably has a P, PI or PID behavior. This Control amplifier 38 controls the servo motor 31, which the Rollers 3 and counter rollers 4 pivoted about the linkage 30 and thus counteracts the measured trajectory.

LIST OF REFERENCE NUMBERS

1

contraption

2

web

3

role

4

counter-roller

5

spoke

6

axis

7

Web running direction

8th

fork

9

pivot bearing

10

admission

10`

actuator

11

pintle

12

frame

13

abutment

14

wave

15

fork

16

pintle

20

camera

21

cutting blade

22

Riller

25

rotary drive

30

linkage

31

servomotor

32

control device

33

summing

34

setpoint

35

control amplifier

36

servomotor

37

summing

38

control amplifier

A

axis

Claims (10)

1. Device for guiding a laterally stable web (2), in particular a paper, paperboard, corrugated board or plastic web, the device (1) having a plurality of axially aligned rollers (3) which can be pressed against the web (2) and rotated independently of one another, which can be placed approximately centrally on the web (2) and are held such that they can be pivoted transversely with respect to the web running direction, and which are opposite a backing means (13) supporting the web (2), characterized in that the backing means (13) is formed by a plurality of axially aligned backing rollers (4) which can be rotated independently of one another, are held such that they can be pivoted transversely with respect to the web running direction (7), the web (2) being held in a clamping engagement between the rollers (3) and the backing rollers (4) and at least one of the rollers (3) and/or backing rollers (4) being driven in rotation, and at least two of the rollers (3) and/or backing rollers (4) being rotatably in frictional contact with a common shaft (14) which is driven by a rotary drive (25).
2. Device according to Claim 1, characterized in that the backing rollers (4) are operatively connected to the rollers (3) via a gear mechanism (30) and can be pivoted by a common actuating drive (31).
3. Device according to Claim 1 or 2, characterized in that the backing rollers (4) are mounted in a holder (15) which can be pivoted about a fixed axis (A) spaced apart from the backing roller axis (14) in the web running direction (7) and is otherwise immovable.
4. Device according to at least one of Claims 1 to 3, characterized in that the rollers (3) and the backing rollers (4) are held such that they can be pivoted about a common axis (A).
5. Device according to at least one of Claims 1 to 4, characterized in that the rollers (3) can be pressed against the web (2) by an actuating drive (10'), the pressing force of the rollers (3) being adjustable.
6. Method for guiding a laterally stable web (2) in particular a paper, paperboard, corrugated board or plastic web, in which a plurality of axially aligned rollers (3) which can be rotated independently of one another are placed approximately centrally on the web (2), are pressed against the latter and are pivoted transversely with respect to the web running direction (7), characterized in that the web (2) is supported by a plurality of backing rollers (4) which are opposite the rollers (3), can be rotated independently of one another and which are pivoted synchronously in relation to the rollers (3), the web (2) being held in a clamping engagement between the rollers (3) and the backing rollers (4), downstream of which a cutting knife (21) severing the web (2) longitudinally and/or a scoring means (22) creasing the web (2) longitudinally are arranged, which is/are held such that it/they can be displaced transversely.
7. Method according to Claim 6, characterized in that the rollers (3) and the backing rollers (4) are pivoted by means of a control system as a function of a measured web course.
8. Method according to Claim 6 or 7, characterized in that the desired value of the web run control system depends on the position of the cutting knife (21) and/or scoring means (22).
9. Method according to at least one of Claims 6 to 8, characterized in that the cutting knife (21) and/or the scoring means (22) is tracked by controlling the position of a web edge or a marking printed on the web (2).
10. Method according to at least one of Claims 6 to 9, characterized in that, in the event of a displacement of the cutting knife (21) and/or of the scoring means (22), the web course resulting from this is calculated and taken into account in the web run control system.

Images