EP1385768B1 - Method of adjusting a guiding roller - Google Patents

Abstract

A motor is provided for displacing the piston. A control switch (53) operates the motor such that the piston takes in the desired position which is defined by the control signal. The control switch feeds the control signal with the position of the edge of the material web (09). A detector which is displaceably coupled to the piston supplies the control signal. The detector comprises a photocell. An independent claim is also included for the method of adjusting the turning bar.

Description

The invention relates to a method for adjusting a guide roller according to the preamble of claim 1.

Guide rollers of this type are used, in particular, at the exit of a rotary printing machine when it is necessary to divert a plurality of partial webs into which a paper web printed by the rotary printing press has been cut and leave a cutting device lying side by side in such a way that they are laid one over the other, possibly folded and can be processed further.

DE 34 36 870 C1 discloses a turning bar with axially displaceable piston.

By US 54 64 143 A turning bars are known, which are formed with a compressed air-fed interior. The jacket of the turner bar is provided on at least part of its circumference with holes through which air can escape from the interior to form an air cushion between the turner bar and the material web.

In the interior of this known turning bar pistons are axially displaceable, block depending on their position in the turning bar a more or less large number of holes so as to adapt the width of the air cushion generated on the turning bar to the width of the material web to be deflected thereon.

Such an adaptation is necessary, because compressed air, which escapes through not covered by the material web holes of the shell, leads to an undesirable weakening of the air cushion, that of the covered by the material web holes is generated, so that in the case of a narrow material web, the air cushion effect may be insufficient. In addition, the air streams exiting through uncovered holes can disturb the travel of adjacent material webs.

However, can be achieved with the known from the above-mentioned document turning bar no optimal adaptation of the shape of the air cushion to the course of the web. The reason for this is that the piston inner sides are flat, whereas the edge of a material on the turning bar typically deflected by 90 ° material on the coat of the turning bar follows a helix. If the pistons are adjusted in such a way that all holes not covered by the material web are blocked, triangular zones result in the edge region of the material web in which the web is not completely supported by an air cushion. If you set the pistons so that the entire web is supported by an air cushion, so inevitably compressed air supplied holes remain uncovered.

To avoid this problem, pistons are used, which are not flat on their side facing the interior, but have edges whose course corresponds in each case on one half of its circumference of a right-handed and on the other half of a left-handed helix. The pistons are rotatable about their axis in the turner bar so that, depending on which direction the web is deflected, one or other of the two helical edges may be turned toward the perforated portion of the circumference of the shell which is to be deflected by the web to be deflected is entwined.

With such a shaped piston, the available compressed air can be optimally utilized, the material web is homogeneously supported on its entire width by an air cushion on its way around the turning bar, and the escape of air streams from unseen holes is avoided.

To take full advantage of the piston described in the above-referenced US patent, as well as the piston described herein, it is necessary to precisely position the pistons to that width each time the turner bar is to be used to divert a web of varying width adapt. Even if not the width, but only the deflection of the web is changed, this may require a readjustment of the position of the piston. This process is very laborious and cumbersome, because the piston is not visible inside the jacket of the turning bar. While an operator may not look into the holes as long as a track is not passed over the turning bar to determine whether or not a hole is blocked by a piston, once the track has passed over the turning bar, there is no possibility of to check that all holes covered by the web are actually clear, so that the air cushion is produced to the required width.

JP 11-246098 A describes a pressurizable with air guide roll, the jacket is provided with holes. These holes can be selectively closed by means of a hydraulically displaceable in the interior locking element depending on a web width. For detecting the web width sensors are arranged.

The invention has for its object to provide a method for adjusting a guide roller.

This object is achieved by the features of claim 1.

The achievable with the present invention consist in particular that an adjustment of the position of the piston to the width or the position of a web on the guide roller can be done quickly and selectively. Even an adjustment of the position of the piston to a web displacement while the web is running is readily possible.

To achieve these advantages, a motor for moving the piston and a control circuit is provided, which operates the motor so that the piston assumes a setpoint position defined by a control signal fed to the control circuit.

As a control signal for the control circuit in particular two types of signals come into consideration, on the one hand, a quantitative signal, d. H. a signal to which a numerical value can be assigned and which allows the control circuit to operate the motor until the piston reaches a position corresponding to the numerical value, and a signal with at least two discrete states, one of which is "prohibited and the other may be referred to as a "permitted" state, in which case the controller may be to operate the motor until the signal transitions to the "allowed" state.

The first type of control signal is particularly suitable for tapping on a web-laying, web-handling device, such as a cutting tool, by measuring the position of a device that determines the position of a web edge, or directly by deriving a control signal. which determines the position of such a device.

It is also possible to determine the position of an edge of the material web directly by means of a sensor or that the desired value from a memory device z. B. control station is specified.

A control signal of the second type may preferably be generated by means of a movable detector coupled to the respective position of the piston for detecting the position of the web edge. The coupling may include a mechanical connection between the piston and the detector; but it is, in particular when the detector is arranged away from the guide roller on the path of the material web, a control technology coupling into consideration.

The fast and targeted adaptability of the piston position is particularly important in a pivotable guide roller, which allows a deflection of the material web either in two different directions. The process of positioning the piston can be so be fully automated, which further simplifies the conversion to different web widths and possibly deflection directions.

Another advantage is that after a pivoting of the guide roll eliminates a separate operation of the rotation of the piston to adapt its edge profile to the course of the web edges.

In order to prevent the escape of compressed air through the slot, it is advantageous to provide a sealing band pressed against the edges of the slot by the air pressure of the inner space. To avoid obstruction of the movement of the carrier through the sealing strip, the latter is preferably coupled to the piston and displaceable in front of the slot.

Alternatively, the detector may also be mounted within the piston to detect the presence or absence of the web of material in front of one of the holes.

If the guide roller is pivotable through 90 ° about an axis perpendicular to its longitudinal axis in order to deflect a material web optionally in opposite directions, the edges of the material web on the surface of the guide roller describe a left-handed or a right-handed helix, depending on the direction of deflection. By an axial rotation of the piston can always that portion of the piston edge whose direction of rotation corresponds to the web edge, be brought into contact with the perforated peripheral portion of the shell, so as to achieve a congruent with the course of the web edge of the edge of the piston.

In order to adapt the rotational position of the piston quickly to the respective deflection, the axial rotation of the piston is preferably coupled by a gear to the pivotal movement of the guide roll.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

Fig. 1

eine schematisierte Draufsicht auf die Leitwalze

Fig. 2

eine Seitenansicht auf die Leitwalze aus Fig. 1 in Richtung des Pfeils II

Fig. 3

einen Teilschnitt durch den in Fig. 1 mit III gekennzeichneten Bereich der Leitwalze

Fig. 4

einen Querschnitt durch die Leitwalze entlang der Line IV-IV aus Fig. 1

Fig. 5

einen Schnitt durch den Endbereich der Leitwalze aus Fig. 1

Fig. 6

den mittleren Bereich der Leitwalze in einem axialen Schnitt

Fig. 7

einen Schnitt analog dem der Fig. 5 durch den Endbereich einer Leitwalze gemäß einer zweiten Ausgestaltung

Fig. 8

einen Querschnitt durch eine Leitwalze gemäß einer dritten Ausgestaltung

Fig. 9

eine schematische Darstellung von Leitwalzen und ihrer Steuerung

Show it:

Fig. 1

a schematic plan view of the guide roller

Fig. 2

a side view of the guide roller of Fig. 1 in the direction of arrow II

Fig. 3

a partial section through the marked in Fig. 1 with III area of the guide roller

Fig. 4

a cross section through the guide roll along the line IV-IV of FIG. 1

Fig. 5

a section through the end region of the guide roller of Fig. 1st

Fig. 6

the central region of the guide roll in an axial section

Fig. 7

a section analogous to that of FIG. 5 through the end region of a guide roller according to a second embodiment

Fig. 8

a cross section through a guide roller according to a third embodiment

Fig. 9

a schematic representation of guide rollers and their control

The guide roller shown in Fig. 1 in plan view, z. B. turning bar 01 is a cylindrical hollow body, which is connected by a at its coat 02 approximately centrally acting arm 03 with a (not shown) frame. The support arm 03 has a hinge 04, which is a pivoting movement of the turning bar 01 to one to the plane of Fig. 1st vertical axis by an angle of 90 ° permits. The turning bar 01 is connected to the joint 04 by a connecting piece 06, which abuts in the end positions of the pivoting movement freedom of the turning bar 01 respectively to one of two stops 07 of the support arm 03. The stops 07 are each adjustable in length in order to adjust the freedom of movement of the turning bar 01 to exactly 90 °.

Through the support arm 03, the joint 04 and the connector 06 runs a compressed air supply line (not shown) through which an interior of the turning bar 01 is supplied with compressed air. This interior is on the one hand by the jacket 02 and the other by two axially displaceable in the jacket 02 locking elements, z. B. piston 17 is limited, their structure will be discussed later with reference to FIG. 3 in more detail. The jacket 02 is provided on the side facing away from the connector 06 half of its circumference with a regular array of holes 08, can escape through the compressed air from the interior to form an air cushion for a deflected on the turning bar 01 web 09. This material web 09 is drawn transparent in FIG. 1, its edges 11 are shown as dashed lines.

At the side facing away from the holes 08 back of the shell 02, two slots 12 are formed on both sides of the connecting piece in the longitudinal direction of the turning bar 01 with a length I, one of which can be seen in the side view of FIG. 2 shows a view of the turning bar 01 in the direction of the arrow II of FIG. 1. Through each slot 12 extends a rod 13, the detector holder 14 and 15 with one of the two aforementioned piston 17 inside the turning bar 01st combines. The detector holder 14 here has the shape of a frame with a slot in which a detector unit of two photocells 16 is mounted parallel to the longitudinal axis of the turning bar 01 adjustable. As can be seen in Fig. 2, one of the two photocells 16 is upwardly oriented, the other downwards. In the position shown in Fig. 1, the downwardly oriented photocell 16 of the detector holder 15 detects an edge 11 of the outgoing web of material 09. The upwardly oriented photocell 16 in the detector holder 14 detects a Edge 11 of the incoming material web 09.

When the turning bar 01 is pivoted from the end position shown by solid lines in Fig. 1 by 90 ° in its other end position shown in dashed lines, so the upwardly oriented photocell 16 of the detector holder 15 detects an incoming edge 11, and oriented downwards Photocell 16 of the detector holder 14 detects an outgoing edge eleventh

Fig. 3 is a partial section through the turning bar 01 of Fig. 1 in the marked in Fig. 1 with III area. This partial section shows a part of the inner structure of the turning bar 01 and in particular one of the two axially displaceable piston 17. The plane of the section is indicated by the dash-dotted line indicated by III in Fig. 2. It can be seen in the section clearly the holes 08 and the slot 12 in the shell 02 of the turning bar 01st

The piston 17 is shown in Fig. 3 to the left of the longitudinal axis X-X of the turning bar 01 in plan view and right of the longitudinal axis in section. He has approximately the shape of a cup having a bottom 18 and a side wall 19, the interior 21 facing edge by two helical sections 22; 23 is formed in each case with opposite direction of rotation. In the position shown here: piston 17 has the holes 08 facing portion 22 a right-handed and the slot 12 facing portion 23 a left-handed direction of rotation.

In this orientation of the piston 17, the edge portion 22 is exactly parallel to a position of the turning bar 01, shown in a solid line in FIG. 1, around this web edge 11 wound around it.

In order to bring the course of the edge portion 22 with the web edge 11 exactly in line, is an axial displaceability of the piston 17 in the interior of the turning bar 01 required. For this purpose, a threaded spindle 24 which is in engagement with a thread in the bottom 18 of the piston 17 and by a more precisely shown in Fig. 5 adjusting means, for. B. Motor 36 is rotated. A second, by the same motor 36 rotatably driven threaded spindle 26 passes through without thread engagement an opening in the bottom 18. It is engaged with a thread in the bottom 18 of an analogous to the piston 17 formed second piston 17, the piston 17 diametrically opposite in the turning bar 01st is housed.

A rod 27 with a square cross-section extends along the axis XX and with a small clearance through an opening in the bottoms 18 of both pistons 17. It is fixedly connected to a transmission 44, 46, 27 shown in Fig. 6 and serves to rotate the pistons 17 about the axis XX in the event of pivoting of the turning bar 01 between its two stop positions.

In the vicinity of the bottom 18, an annular groove 28 is formed in the side wall 19, in which a ring 29 is rotatable. The ring 29 is fixedly connected to the already mentioned rod 13, on which the detector holder 14 is arranged. Through the ring 29, it is possible to rotate the piston 17 about the axis X-X, without the detector holder 14 must follow this rotational movement. To the rod 13, a sealing strip 31 is further added, which extends over the entire length 21 to the interior of the slot 12 open.

Fig. 4 shows this arrangement in a section at the level of the line IV-IV in Fig. 1. The sealing strip 31 is recessed on its entire thickness in grooves 32 on either side of the slot 12 so that it does not affect the rotatability of the piston 17. A bracket 33 may be attached to the connector 06 facing the end of the slot 12, which holds the sealing strip 31 in a non-pressurized state of the interior 21 against the jacket 02 and thus ensures that this unfolds its sealing effect when compressed air into the interior 21 is given.

Fig. 5 shows a section along the longitudinal axis XX of the turning bar 01 by their designated in Fig. 1 with 34 end portion 34. In this end portion 34 of the aforementioned motor 36 is housed in a chamber in the direction of the piston 17 back (after at the top in Fig. 5) is limited by a plate 37. The plate 37 is rotatably supported by a rolling bearing 38 in the shell 02. The rod 27 is rotatably engaged with the plate 37 in engagement. The threaded spindles 24; 26 are rotatably carried by the plate 37 and carry at their ends in the interior of the chamber in each case a drive wheel 39; 41. One to the drive wheels 39; 41 complementary wheel 42 is mounted on the drive shaft 43 of the motor 36. The drive shaft 43 is displaceable in the direction of the longitudinal axis XX between the position shown in Fig. 5, in which the wheel 42 is in engagement with the drive wheel 39, and an engagement position with the drive wheel 41. By a selective displacement of the drive shaft 43, the motor 36 thus be used either to displace both pistons 17. The wheels 39; 41; 42 may be friction wheels or gears; to facilitate the engagement of the wheels with each other, the drive wheels 39; 41 frusto-conical and the wheel 42 may be formed of double frustoconical.

If the turning bar 01 is pivoted to change the direction of deflection of the material web 09, this requires, as already stated above, a rotation of the piston 17 by 180 °. The threaded spindles 24; 26 follow this rotation so that they change places in FIG. The motor 36 is not rotated, yet the engagement of the wheel 42 with one of the drive wheels 39; 41 remain in this rotation. Of course, the selective adjustment of both pistons 17 by means of only one motor 36 can also be effected by means of a coupling mechanism other than that described above. It is also conceivable, each threaded spindle 24; Assign a 26 own engine, which could then be attached in each case to the end of the turning bar 01, which is adjacent to the piston driven by the engine. This motor can be arranged stationary or so that it is a rotational movement of the Rod follows.

Fig. 6 shows a transmission for driving a 180 ° rotation of the piston 17 in the case of a pivoting movement of the turning bar 01 from one of its working positions in the other. The reference numeral 44 denotes a section of a gear or gear segment, which is housed in the connector 06. This gear or gear segment 44 may be arranged stationarily in the connecting piece 06, but it could also be coupled to the position of the turning bar 01 such that it performs a self-rotation in the case of a pivoting movement of the turning bar 01. This gear or gear segment 44 meshes via a helical toothing with another gear 46, which is rotatable about the longitudinal axis X-X of the turning bar 01 and which substantially fills the free cross-section of the interior 21 of the turning bar 01. This gear 46 is shown in Fig. 6 to the left of the longitudinal axis X-X in section and right of the axis in plan view. It is firmly connected to the rod 27. The threaded spindle 26, which serves to drive the piston 17 at the end remote from the motor 36 of the turning bar 01; is freely rotatably guided through a bore of the gear 46. The threaded spindle 24, which serves for driving the piston 17 adjacent to the motor 36, is rotatably supported in the gear 46. The gear or gear segment 44 and the gear 46 are designed so that they implement a pivoting movement of the turning bar 01 by 90 ° about the axis of the joint 04 in a 180 ° rotation of the gear 46 and thus the piston 17. Thus, the transmission 44, 46, 27 shown in FIG. 6 ensures that the pistons 17 are in each of the two working positions of the turning bar 01 in the respectively adapted rotational orientation.

To adjust the turning bar 01 to the leadership of a new material web 09, z. B. proceed as follows. First, the pistons 17 are moved into their each adjacent to the ends of the turning bar 01 stop position. In these positions, the detectors are not each one on the turning bar 01 guided material web 09 opposite. A signal level supplied by the detector unit in this state is regarded as a "prohibited" level. Subsequently, the pistons 17 are moved from the stop positions in each case as far as the center of the turning bar 01, until the detector unit of the piston 17 registers a web edge 11 and changes its output signal to a "permitted" level. Since in each of the two working positions of the turning bar 01 of the two photocells 16 of each detector unit only one of a web edge 11 may be opposite, it is sufficient for the evaluation of the detector signal to evaluate an OR operation of the signals generated by the two photocells 16 of each detector unit to the Reaching the web edge 11 to be detected by the detector unit. In order to increase the detection reliability, it can also be provided that, depending on the working position of the turning bar 01, only one of the two photocells 16 of each detector unit is operated. A control circuit which performs this task is not specifically shown in FIG.

If the position of the detector unit in the detector holders 14, 15 is correctly adjusted, the position of the edge portion 22 or 23 of the piston 17 facing the outside of the jacket 02 corresponds exactly to the course of the edge at the moment when the detector unit registers a web edge 11 11 of the material web 09 on the turning bar 01. Thus, the two pistons cut 17 all those holes 08 on the shell 02 of the turning bar 01 from the compressed air supply from the interior 21, which are not covered by the web 09; however, below the material web 09, a full-surface, homogeneous air cushion can be produced.

Fig. 7 shows a section through the end portion of a turning bar 01 according to a second embodiment of the invention. The position of the cut is the same as in Fig. 5. Elements which correspond in shape or function to the elements of the embodiment described above are given the same reference numerals. The plate 37 is here rotatably connected to the jacket 02, the rod 27 is rotatably mounted on the plate 37. The motor 36 drives via the wheels 42; 39 only the spindle 26 of the one Piston 17 on; a corresponding motor for the other piston is located at the other end of the turning bar 01. A through a slot 47 in the shell 02 engaging wheel 48 is engaged with the wheel 42; it transmits a rotation of the motor 36 to a outside of the turning bar 01 held parallel to this threaded spindle 49. This threaded spindle 49 drives a (not shown in FIG. 7) detector holder as the detector holder 14 of FIG. 1 to a to the movement of the piston 17 coupled movement.

Fig. 8 shows a third embodiment of the turning bar 01 in a cross section. The essential difference between the embodiment described above and the embodiment of FIG. 7 is the arrangement of the detectors. The detectors may in turn be, for example, photocells 16. These photocells 16 are arranged in the embodiment of Figure 8 in the interior of the turning bar 01, and that they are respectively in the side wall 19 of the cylinder 17 in each case in the vicinity of the edge portion 22; 23 so that they can detect the presence of the web 09, if the detectors are in front of one of the holes 08. Although in this embodiment, the accuracy with which the position of the web edge 11 can be detected, limited to the distance of the holes 08 in the axial direction, but this does not affect the functionality of the device, since the piston 17 in the interior of the turning bar 01 order just this distance can be moved without this changes the number of open or locked holes 08.

In this embodiment, as a detector in particular also a flow sensor is applicable, which registers the flow of air from the interior 21 to the outside when he passes a hole 08, which is not covered by the material web 09.

Fig. 9 shows a schematic representation of turning bars 01 and their control. A plurality of turning bars 01, the z. B. are arranged following a cutting device in which a web of material 09, in particular a printed paper web 09, is cut into a plurality of partial webs 09, which are each deflected by a turning bar 01. The position of the individual rotating blades 51 of the cutting device can be adjusted at a control station 54. A control signal indicative of the target position of each blade 51 is supplied to actuators (not shown) of the knives 51 via a signal line 52. This control signal, which at the same time also defines the position of the edges 11 of the partial webs 09 cut by the knives 51, is branched off to a control circuit 53, which, taking into account the positions of the turning bars 01, which are adjustable transversely to the web direction, will each have a desired position of the cylinders in the interior the turning bars 01 calculates and their motors controls to approach this target position.

Alternatively, the control signal could also be obtained by means of position detectors which measure the position of the knives 51 or the web edges 11 they produce in the cutting device.

In order to set the thus calculated target position, the control circuit can hold the actual position of each cylinder in a memory, calculate the difference between both positions and operate each motor at a known rotational speed until the piston from the actual position to the target Position should have passed.

Alternatively, an operating state of the control circuit can be provided, in which the control circuit initially moves each piston into a stop position in order to adapt to a changed web width or a changed position of the turning bars. When this is reached, a control state is changed in which the control circuit moves out of this exactly known stop position, the target position by operating the motor for a calculated angle of rotation or a calculated time at a known rotational speed.

LIST OF REFERENCE NUMBERS

01

Guide roller, turning bar

02

coat

03

Beam

04

joint

05

-

06

joint

07

attack

08

holes

09

web

10

-

11

Edge (09)

12

slots

13

Bar, carrier

14

detector holder

15

detector holder

16

photocell

17

Locking element, piston

18

ground

19

Side wall

20

-

21

inner space

22

edge section

23

edge section

24

screw

25

-

26

screw

27

pole

28

ring groove

29

ring

30

-

31

sealing strips

32

recruitment

33

hanger

34

end

35

-

36

Adjusting means, engine

37

plate

38

roller bearing

39

drive wheel

40

-

41

drive wheel

42

wheel

43

drive shaft

44

Gear / segment (06)

45

-

46

gear

47

slot

48

wheel

49

screw

50

-

51

knife

52

signal line

53

control circuit

54

control station

I

length

X X

longitudinal axis

Claims (4)

1. A method of adjusting a guide roller (01), wherein the guide roller has a casing (02) provided with perforations (08) at least on part of its periphery and an interior space supplied with compressed air, wherein at least one blocking element (17) is moved in order to block the perforations (08) in a selective manner, wherein the blocking element (17) is moved by means of at least one control element (36) in a manner dependent upon a position of an edge (11) of the web of material (09), characterized in that the blocking element (17) is displaced in a manner dependent upon a cutting device (51) which fixes the position of the edge (11) of the web of material (09).
2. A method according to Claim 1, characterized in that the position of an edge (11) of the web of material (09) is detected by means of a sensor.
3. A method according to Claim 1, characterized in that the position of an edge (11) of the web of material (09) is pre-set as a nominal value from a memory device.
4. A method according to Claim 1, wherein the guide roller (01) is constructed in the form of a turner bar (01), and wherein a plurality of turner bars (01) are arranged adjoining a cutting device, and wherein a web of material (09) is cut in the cutting device into a plurality of web portions (09) which are deflected by a turner bar (01) in each case.

Images