EP1873099A1 - Roller for guiding and transversally stretching web material - Google Patents

Abstract

The roller (1) has a set of roller bodies rotatably supported at a roller axis (2), so that the roller axis is fixed in a clamp bearing at both ends. A force transducer (13) measures the traction force of a strip material and is integrated in clamp bearings (7, 8). The clamp bearings have spring elastic bearing retainers, which stand in effective connection with the roller axis perpendicular to a longitudinal axis (5) of the roller axis. The spring-elastic bearing retainer is formed as force retainers.

Description

The invention relates to a roller for guiding and spreading of strip material in a winding device, preferably for a device for continuously coating the strip material, with a plurality of roll bodies rotatably mounted on a roll axis, wherein the roll axis of both ends in each case a clamping bearing can be fixed.

Rolls of this type, also called spreader rolls, extend over thin webs or strips of, for example, paper, plastic or metal, transversely to the conveying direction and thus serve for smoothing and wrinkle-free guiding of this strip material. Winding devices with such spreader rolls are used in particular in film strip coating systems for continuous steaming or sputtering of Foliebändern- and webs in vacuum, where it depends on particularly smooth and wrinkle-free guidance and uniform tension of the film. The spreader rolls are therefore usually connected upstream of a treatment or coating station.

The stretching effect transversely to the conveying direction of the film web is achieved by a curved along the roll axis contour of the lateral surface of the spreader roll, which results from the individual juxtaposed on the roll axis roller bodies, the spreading effect in cooperation with the wrap angle of the film web to the contour of the spreader roll and the tensile stress of the film web can be influenced.

To achieve this curved contour of the lateral surface of the spreader roller a number of different constructions are known. So describe the US 3,951,480 . US Pat. No. 3,804,473 A and the U.S. 3,666,049 in each case a spreader roll with a pipe bend curved in the longitudinal direction as a roll axis, on which by means of individual roller bearings a plurality of cylindrical roller bodies with the same diameter cover diameter are rotatably mounted, which are surrounded to seal the gaps by a flexible hose.

In other constructions of spreader rolls, such as the EP 0 829 654 A2 , Are on a continuous straight roll axis frusto-conical roll body lined up with each other from the roll end continuously increasing or decreasing cladding diameters, which are each supported by means of individual rolling bearings independently of each other rotatably on the roll axis.

From the DE 41 26 535 C2 a spreader roll is known in which a plurality of cylindrical roller bodies are arranged on a straight roll axis, wherein only the central roll body is mounted parallel to the longitudinal axis of the roll axis and all other roll bodies are mirror-symmetrically adjustable at an angle to the longitudinal axis of the roll axis.

In addition, from the EP 1 591 392 A1 Spreader rolls having a non-straight roll axis are known from two roll axis sections which are coupled together at an obtuse angle to their longitudinal axes. On these roller shaft sections are arranged on both sides of the coupling point a plurality of rolling bearings rotatably arranged roller bodies together, wherein the lateral surfaces of the roller body are cylindrical or frusto-conical and the shell diameter of the adjacent roller body pass continuously.

With regard to the drive of the roller bodies, driven spreader rollers are known in which the roller bodies are connected to one another and are driven by an external motor at one end of the spreader roller. In the case of the passive spreader rollers, the individual roller bodies are moved by the film web drawn over the spreader roller.

An effective spreading and a stable, wrinkle-free guidance of the film webs through the film strip coating system simultaneously requires a constant tension of the guided film without causing the film web breaks, which is monitored by known in the art Zugmesswalzen, in the winding device as additional measuring devices and the spreader roll are coordinated. This Zugmesswalze detects a perpendicular to the longitudinal axis of the Zugmesswalze acting web tensile force of the transported over Foliebahn as a compressive force on the or the Zugmesswalzenkörper or on the bearings of the Zugmesswalze. The detection of the pressure force, for example, by means of the two-sided Storage of the tension measuring roll on load cells, as in DE 41 31 760 A1 describe or by means of the bearing of the tension measuring roll on bending beam with strain gauges, as described in the DE 36 09 623 A1 , In accordance with the values of the compressive force detected by the load cells or strain gauges, the tension acting on the film web is kept constant at a specific desired value via, for example, a web guide for controlling a roller drive or a roller brake device.

Winding devices according to this prior art require a high design cost and considerable space requirements for a high-quality web guide in particular thin films. In addition, according to the latest technologies for the multiple treatment of thinnest films, the sections for the film treatment and film coating processes should be provided with increasingly more space within the film strip coating plant.

The invention is therefore based on the object to improve the generically known spreader roller to the effect that the space required and the design complexity of the winding device is reduced.

The object is achieved by the features in the characterizing part of claim 1, wherein expedient developments of the invention are characterized by the features in the dependent claims.

According to the invention, a force transducer for measuring the tensile force of the strip material is integrated in at least one clamping bearing of the roller. This integration of a Zugmesssensors in at least one of the clamping bearing designed especially for Dünnstfolien spreader roller two functions are accomplished with a roller, namely the spreading as well as the tension measurement, whereby the spreader roller associated Zugmesswalze can be omitted, so that a corresponding space saving within the system and also results in a reduction of the manufacturing costs.

Furthermore, it is advantageous that the clamping bearing have resilient bearing receptacles which are perpendicular to the longitudinal axis of the roll axis with the roll axis in an operative connection, wherein at least one resilient bearing receptacle is designed as a force transducer.

The elastic bearing receptacles of the clamping bearings assigned to the two ends of the roller axle permit an axis-parallel deflection of the spreader roller perpendicular to its longitudinal axis due to the web tension of the removed film web which produces a resultant deflection force perpendicular to the longitudinal axis of the roller axle. In accordance with the selected wrap angle of the film web around the spreader roll, this resulting deflection force is directed in the direction of the bisecting line of the wrap angle. This deflection force is absorbed as deformation stress of the frame-fixed anchored elastic bearing receptacles of the clamping bearing. By means of the spring-elastic bearing receiver designed as a force transducer, this deformation stress, which is proportional to the web tensile force, is measured by a force sensor integrated in the force transducer. This tensile force measurement can therefore be exerted on the spreader roll without adversely affecting the function of spreading. Thus, the function of the previously separately executed Zugmesswalze is transferable to the spreader roll.

If the deflection forces are different as a result of variable Folienzugspannung both ends of the spreader roll, it is advantageous if both resilient bearing mounts are designed as a force transducer, because in this way the measurement of the deflection forces differentiated and thus more accurate. The measured values of the force sensors can subsequently enter into the web tension control as individual values or as mean values, depending on requirements and application.

In a particularly favorable embodiment of the invention, the spring-elastic bearing receptacle and / or the force transducer is arranged substantially longitudinally extended to the roll axis. This design of the spreader roll according to the invention is characterized by a particularly space-saving and efficient construction for detecting the web tension. Aligned in the longitudinal extent to the roll axis, the spring-elastic bearing receptacle or the force transducer is as a connected to the clamping bearing bending beam designed. In this case, the bending beam designed as a force transducer takes on the resulting deflection force acting perpendicular to the longitudinal axis of the spreader roller as a bending strain, which in turn can be measured by the integrated force sensor as tensile or compressive force.

This elongated to the roll axis design of the bearing support or the force transducer allows a slim design of the clamping bearing of the spreader roll according to the invention, without that elements of the bearing structure project beyond the cladding diameter of the spreader roll. In this way, a combined spreader and tension measuring roller can be realized as a particularly compact unit.

In a special embodiment, the force transducer is arranged between an axle-side clamping bush of the clamping bearing and a frame-fixed clamping bush of the clamping bearing, wherein a force-absorbing end of the force transducer is assigned to the axle-side clamping bush. In the axle-side clamping bush engages on the one hand, the end of the roll axis and on the other hand the freely movable, force-absorbing end of the force transducer. Thus, the deflecting force acting on the roller axis is recorded directly on the freely movable end of the force transducer, that is on a short, force-transmitting path, whereby the measurement of the deflection force as a measure of the web tensile force is more sensitive and accurate.

In a further advantageous embodiment, the roll axis is rotatably mounted relative to the force transducer. In addition to the deflection forces acting perpendicular to the longitudinal axis of the spreader roller as a result of the web tension of the film web, slight torques are also exerted on the roll axis of the spreader roll by the spreading and the film conveyance via the spreader roll. With the help of the rotatable mounting of the roll axis, the associated rotational forces are not transmitted to the load cell, which receives the deflection forces of the roll axis. On the one hand, this prevents the force transducer from being deformed or twisted in an undesired direction, and consequently the measuring direction of its force sensor is not aligned exactly with the direction of the resulting deflection force, which falsifies the measurement results of the web tensile force. On the other hand, the elimination of the rotational force components from the deflection forces acting on the force transducer leads to a higher measuring accuracy of the force sensor with regard to the web tensile force.

If the force transducer is connected to the axle-side clamping bush via a self-aligning ball bearing, the measuring accuracy of the web tension is further improved. The self-aligning ball bearing has due to its special structural design under the rolling bearings over an axial angular mobility with low friction. Thus, the self-aligning ball bearing is largely insensitive to possible misalignments of the roll axis and the axle-side clamping bush with respect to the bearing axis of the self-aligning ball bearing. By non-uniform web tensile forces along the spreader roll, for example, slight, variable misalignments of the roll axis are caused. When using spreader rolls with non-straight roll axes, there is already a design-related, slight inclination of the roll axis to the bearing axis of the self-aligning ball bearing. By means of the self-aligning ball bearing resulting from the inclination or inclination of the roll axis force components are largely compensated and turned off as a disturbance factor in the stationary measurement of train train relevant deflection forces in the force transducer.

In a particular embodiment, the frame-fixed clamping bush of a clamping bearing on an elastic rotation of the rotatably mounted roll axis. The elastic rotation lock causes a positional fixation of the roll axis in a defined angle of rotation to the frame of the winding device without hindering the flexible support of the roll axis in operative connection with the spring-elastic bearing receptacle or the force transducer. This positional fixing allows the use according to the invention of in particular spreader rolls with non-straight roll axes as a combined spreader and tension measuring roll. The curvature or inclination of this non-straight roll axis necessitates a certain angular extent of the roll axis relative to the plane of the sheet passed over the spreader roll for effective spreading. In this angular position, the roll axis must be fixed against rotation, which can be realized by an anti-rotation, which blocks the rotation of the roll axis. At the same time, the elasticity of the anti-rotation device according to the invention ensures that the deflection forces acting perpendicular to the roll axis can be transferred to the spring-elastic bearing mounts or to the force transducers unhindered and thus the measurement of the web tension is not prevented by the anti-twist device.

A structurally very practical embodiment of the anti-rotation device according to the invention is an elastic sleeve, which is connected on the one hand with the axle-side clamping bush and on the other hand with the frame-fixed clamping bush. The cuff comprises the resilient bearing receptacle or the force transducer, which is mounted between the axle-side clamping bush and the frame-fixed clamping bush, without contact, wherein its elasticity allows the deflection forces acting on the spring-elastic bearing receptacles or on the load cells to pass unhindered.

If the roll axis can be fixed in different rotational angle positions, in particular not straight roll axes can be adjusted by turning and fixing their axial position into different contour-forming positions relative to the plane of the sheet web guided over the spreader roll. Thus, the contour of the spreader roller in relation to the film web and consequently the spreading effect on the film web can be influenced. Likewise, the spreader roll can for example be adapted to the material properties of different film webs or to different angles of wrap of the film webs, while the web tension measurement in any case unhindered and immutable is feasible.

If the arrangement of the force transducer in the frame-fixed clamping sleeve is adjustable at a rotational angle to the roll axis, the measuring direction of the force transducer can be adapted to different directions of the resulting deflection force, which develop at a plant-specific variable wrap angle of the film strips or webs around the spreader roll. The measuring direction of the load sensor integrated force sensor can be exactly matched with the respective direction of the resulting deflection force, so that even with variable wrap angle of the combined spreader and metering through the film web, the tensile measurement can be done optimally.

Furthermore, it is advantageous if a clamping bearing is designed as an axial fixed bearing and the other clamping bearing as an axial floating bearing. This design allows thermally induced expansions of the roll axis of the spreader roll in its longitudinal extent, without any displacement forces acting in the longitudinal direction of the roll axis on the clamping bearing, respectively on the force transducer and can distort the resulting deflection force to be measured.

Fig. 1

einen Längsschnitt der erfindungsgemäßen Breitstreckwalze entlang der Schnittlinie A-A,

Fig. 2

einen Längsschnitt der erfindungsgemäßen Breitstreckwalze entlang der Schnittlinie B-B,

Fig. 3

die erfindungsgemäße Breitstreckwalze in perspektivischer Ansicht in ihrer Einbaulage,

Fig. 4

die erfindungsgemäße Breitstreckwalze in einer sinnbildlichen Querschnittsdarstellung.

The spreader roll according to the invention is explained in more detail below using an exemplary embodiment. The accompanying drawings show in a schematic representation in FIG

Fig. 1

a longitudinal section of the spreader roll according to the invention along the section line AA,

Fig. 2

a longitudinal section of the spreader roll according to the invention along the section line BB,

Fig. 3

the spreader roll according to the invention in a perspective view in its installed position,

Fig. 4

the spreader roll according to the invention in a symbolic cross-sectional view.

The expander roller 1 according to the embodiment consists, as shown in FIGS. 1 and 2, of a roller shaft 2 on which a plurality of cylindrical roller bodies 3 of metal, for example, by means of rolling bearings 4 are mounted rotatably about the longitudinal axis 5 of the roller shaft 2. A film web 6 to be stretched and measured is pulled over the roll body 3, the roll body 3 rotating (see FIG. 3). The roller shaft 2 with the roller bodies 3 is shown shortened in Fig. 1 and 2 for the sake of simplicity. Both ends of the roller shaft 2 are clamped in each case an axle-side clamping bushing 9,10 of the clamping bearing 7,8. Between the axle-side clamping bushes 9, 10 and the frame-fixed clamping bushes 11,12 of the clamping bearing 7,8 each one longitudinal axis 5 of the roll axis 2 elongated force transducer 13,14 is arranged as a bending beam, wherein a force-absorbing, freely movable measuring head 15,16 both force transducer 13th , 14 in each case in the axle-side clamping bush 9,10 is mounted and the measuring head 15,16 opposite end of the force transducer 13,14 each fixed in the frame-fixed clamping bush 11,12 is clamped. For the storage of the measuring head 15,16 of the force transducer 13,14 in the axle-side clamping bush 9,10 each a self-aligning ball bearing 17,18 is provided. About this self-aligning bearings 17,18 is also the with the axle-side clamping bushes 9,10 strained roller axle 2 rotatably mounted. As a result of the web tensile force F ₁ , F ₂ of the guided over the spreader roller 1 film web 6, the roller axis 2 is axially parallel and perpendicular to its longitudinal axis 5 in the direction of the resulting deflection force F ₁₂ deflected, as illustrated in Fig. 3 and 4. Corresponding to the wrap angle α of the film web 6 about the spreader roll 1 in its installed position, the resulting deflection force F _{12 is directed} in the direction of the bisector of the wrap angle α. Each force transducer 13, 14 is aligned in its frame-fixed clamping bush 11, 12 in such a rotational angle to the roll axis 2 that the measuring direction of the integrated force sensor (not shown) coincides with the direction of the resulting deflection force F ₁₂ . A marking 19,20 on the force transducer 13,14 points to the measuring direction of the force sensor. The force sensor measures the deflection force F ₁₂ as a measure of the web tension F ₁ , F ₂ and provides the measurement signal for forwarding to a web guide, not shown, for controlling a constant tension. By means of the rotatable mounting of the roller axle 2 via the self-aligning ball bearings 17, 18, the measuring heads 15, 16 remain free of rotational forces, so that only the deflection force F ₁₂ resulting from the web tensile force F ₁ , F ₂ is detected by the respective force sensor.

The roller shaft 2 is formed slightly curved in the middle according to the embodiment, which is not shown in Figs. 1-3. This type of spreader roll 1 with a non-straight roll axis 2 requires a rotational angle-dependent installation position of the roll axis 2 for a certain expander effect of the guided over the spreader roll 1, for this purpose, the elastic sleeve 21 is provided as rotation of the roll axis 2, on the one hand with an axle-side clamping bushing and on the other hand connected to the associated frame-fixed clamping bush 11 of the clamping bearing 7 and thus fixes the roll axis 2 in a certain angular position. The distance of the sleeve 21 to the force transducer 13 and its bending elasticity allows unimpeded deflection of the roll axis 2 with the axle-side clamping bushing 9 in the direction of the resulting deflection force F ₁₂ and thus ensures error-free measurement of the resulting deflection force F ₁₂ as a measure of the web tensile force F ₁ , F ₂ ,

The axle-side clamping bush 10 of the other clamping bearing 8 is axially displaceable in the direction of the longitudinal axis 5 relative to the self-aligning ball bearing 18, which is supported by the measuring head 16. The measuring head 16 of the fixed force in the frame clamping bush 12 force transducer 14 is fixed in the axial direction. Thus, this clamping bearing 8 is formed as a floating bearing. Displacement forces in the longitudinal direction 5 of the roll axis 2 due to thermal expansion are thus not transferred to the measuring heads 15,16 of the force transducer 13,14.

According to this embodiment, according to the invention, a combined spreader and tension measuring roll 1 is realized in a compact, space-saving unit with low constructional outlay while realizing a high measuring accuracy of the tensile force measurement.

LIST OF REFERENCE NUMBERS

1

Spreader roll

2

roll axis

3

cylindrical roller body

4

roller bearing

5

Longitudinal axis of the roll axis

6

sheet

7

terminal warehouse

8th

terminal warehouse

9

axle-side clamping bush

10

axle-side clamping bush

11

frame-resistant clamping bush

12

frame-resistant clamping bush

13

elongated load cell, bending beam

14

elongated load cell, bending beam

15

Measuring head of the force transducer

16

Measuring head of the force transducer

17

Aligning ball bearings

18

Aligning ball bearings

19

Marking of the force transducer

20

Marking of the force transducer

21

elastic cuff, anti-twist device

F ₁ , F ₂

Web tensile force of the film web

F ₁₂

resulting deflection force

α

Wrap angle of the film web

Claims (11)

Roller for guiding and spreading strip material in a winding device, preferably for a device for continuously coating the strip material, with a plurality of roll bodies rotatably mounted on a roll axis, the roll axis being fixable in a respective clamping bearing at both ends,
characterized in that
at least in a clamping bearing (7,8) a force transducer (13,14) is integrated for measuring the tensile force of the strip material. Roller according to claim 1,
characterized in that
the clamping bearings (7, 8) have spring-elastic bearing receptacles which are in operative connection with the roll axis (2) perpendicular to the longitudinal axis (5) of the roll axis (2), wherein at least one spring-elastic bearing receptacle is designed as force transducer (13, 14). Roller according to claim 1 or 2,
characterized in that
in that the spring-elastic bearing mount and / or the force transducer (13, 14) is arranged substantially longitudinally to the roll axis (2). Roller according to one of the preceding claims,
characterized in that
the force transducer (13, 14) is arranged between an axle-side clamping bush (9, 10) of the clamping bearing (7, 8) and a clamping bush (11, 12) of the clamping bearing (7, 8) fixed to the frame, wherein a force-receiving end (15, 16 ) of the force transducer (13,14) of the axle-side clamping bush (9,10) is assigned. Roller according to one of the preceding claims,
characterized in that
the roller shaft (2) is rotatably mounted relative to the force transducer (13, 14). Roller according to claim 5,
characterized in that
the force transducer (13,14) via a self-aligning ball bearing (17,18) with the axle-side clamping bush (9,10) is connected. Roller according to claim 5 or 6,
characterized in that
the frame-fixed clamping bush (11) of a clamping bearing (7) has an elastic rotation lock (21) of the rotatably mounted roller shaft (2). Roller according to claim 7,
characterized in that
the anti-rotation device (21) is an elastic sleeve (21) which is connected on the one hand to the axle-side clamping bush (9) and on the other hand to the frame-fixed clamping bush (11). Roller according to one of the preceding claims,
characterized in that
the roll axis (2) can be fixed in different rotational angle positions. Roller according to one of the preceding claims,
characterized in that
the arrangement of the force transducer (13, 14) in the frame-fixed clamping bush (11, 12) is adjustable in a rotation angle with respect to the roll axis (2). Roller according to one of the preceding claims,
characterized in that
a clamping bearing (7) as an axial fixed bearing and the other clamping bearing (8) is designed as an axial floating bearing.

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