EP1471020A2 - Turning bar - Google Patents

Abstract

The deflection bar (01) is provided with holes (08) over at least part of its peripheral mantle (02), enclosing a pressure space supplied with compressed air, with at least one blocking element, e.g. a piston, for selectively blocking the holes upon its pivot movement through 90 degrees about a pivot axis perpendicular to its longitudinal axis. The movement of the blocking element is coupled to the pivot movement of the deflection bar about a pivot axis perpendicular to its longitudinal axis relative to a frame.

Description

The invention relates to a turning bar for deflecting a material web according to the Preamble of claim 1.

Turning rods of this type come in particular at the exit of one Rotary printing machine is used when it is necessary to use several partial webs, one of which is the paper web printed on the rotary printing machine has been cut, and the next to each other leave a cutting device so that it can be redirected can be placed on top of one another, if necessary folded and further processed.

DE 34 36 870 C1 describes a turning bar in which sliding pistons their free ends a design adapted to the path of the material web exhibit. These pistons can be turned through 180 °.

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

Pistons are axially displaceable in the interior of this known turning bar, each after their position in the turning bar, a more or less large number of holes block the width of the air cushion generated on the turning bar to the Adjust the width of the material web to be deflected on it.

Such an adjustment is necessary because compressed air, which is not caused by the Holes of material covered by the material escapes from the jacket, which leads to an undesirable one Weakening of the air cushion that from the holes covered by the material web is generated so that in the case of a narrow web of material the air cushion effect can be inadequate. In addition, they can escape through uncovered holes Air currents disrupt the course of adjacent material webs.

However, with the turning bar known from the above-mentioned document no optimal adaptation of the shape of the air cushion to the course of the material web to reach. The reason for this is that the inside of the piston is flat, whereas the Edge of a material web typically to be deflected by 90 ° on the turning bar a helix follows the jacket of the turning bar. If you adjust the pistons that all holes not covered by the material web are blocked, so in the Edge area of the material web triangular zones in which the web is not completely off an air cushion is supported. Adjust the pistons so that the entire path of is supported by an air cushion, there are inevitably holes supplied with compressed air uncovered.

In order to avoid this problem, pistons are used on their interior facing side are not flat, but have edges, the course of each on half of its circumference is right-handed and the other half is one left-handed helix. The pistons are in the turning bar around theirs Axis rotatable so that depending on the direction in which the material web is deflected, one or the other of the two helical edges to the perforated Part of the circumference of the jacket can be rotated from that to be deflected Material web is wrapped.

With a piston shaped in this way, the available compressed air can be optimally used use, the material web is on its way around the turning bar on its entire Width supported homogeneously by an air cushion, and the escape of air currents uncovered holes are avoided.

To take advantage of the piston described in the aforementioned US 54 64 143 A like It is necessary to make full use of the piston described here every time the turning bar is used to deflect a material web with a different width to adjust the position of the pistons exactly to this width. Even if not the width, but only the deflection direction of the material web is changed, this can readjust the position of the pistons. This process is very Labor-intensive and tedious because the piston inside the jacket of the turning bar cannot be seen. An operator can, as long as there is no web over the Turning rod is guided, possibly look into the holes and determine whether a Hole is blocked by a piston or not, however, as soon as the web is over the Turning rod is guided, there is no way to check that everyone is off the track hidden holes are actually free, so the air cushion to the required width is produced.

DE 93 20 281 U1 discloses a pivotable turning bar, with an axial slidable piston, the axial movement of the piston to the pivoting movement the turning bar is coupled. In another embodiment Axial movement of the piston provided a fixed motor, which is bendable Shaft adjusts the piston.

The US 44 53 465 A discloses a pivotable turning bar, the circumferential direction pivotable piston is adjusted by means of a gear.

The invention has for its object to provide a turning bar.

This object is achieved by the features of claim 1.

The advantages that can be achieved with the invention are in particular that a Adaptation of the position of the pistons to the width or the position of a material web the turning bar can be done quickly and specifically. Even an adjustment of the position the piston to a web displacement while the web is running is easily possible.

To achieve these advantages, there is a motor to move the piston and one Control circuit provided that operates the engine so that the piston one by one control signal supplied to the control circuit assumes a defined target position.

In particular, two types of signals come as the control signal for the control circuit first, a quantitative signal, i. H. a signal that has a numerical value can be assigned and that allows the control circuit, the motor for as long to operate until the piston has reached a position corresponding to the numerical value, on the other hand a signal with at least two discrete states, one of which is a "prohibited" and the other can be described as an "allowed" state, then the controller can consist of operating the motor until the signal in passes the "allowed" state.

The first type of control signal is particularly suitable for connecting it to one of the turning bars upstream, the material processing device such as a To tap the cutting tool, be it by measuring the position of a device determines the position of a web edge or directly by deriving it from a control signal, that determines the position of such a facility.

A control signal of the second type can preferably be sent to the respective one with the aid of a Position of the piston coupled movable detector to detect the position of the Web edge are generated. The coupling can be a mechanical connection between piston and detector; but it happens, especially if the Detector from the turning bar is arranged on the path of the material web, one control coupling.

The quick and targeted adjustability of the piston position is particularly important for a swiveling turning bar, which alternatively deflects the web allowed two different directions. The process of positioning the pistons can so be fully automated, which means switching to different web widths and possibly further simplified deflection directions.

Another advantage is that after swiveling the turning bar a separate one Operation of rotating the pistons to adapt their edge shape to the The course of the web edges is omitted.

In order to prevent compressed air from escaping through the slot, a through can advantageously be used the air pressure of the interior sealing tape pressed against the edges of the slot be provided. To hinder the movement of the wearer by the To avoid sealing tape, the latter is preferably coupled to the piston and before Slidable.

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

When the turning bar about an axis perpendicular to its longitudinal axis by 90 ° is pivotable around a material web optionally in opposite directions deflect, so describe the edges of the material web on the surface of the Depending on the direction of deflection, the turning bar is a left-handed or a right-handed one Helix. By axially rotating the piston, that area of the Piston edge, whose direction of rotation corresponds to that of the web edge, with the perforated Circumferential region of the jacket are brought into contact, so as to be in contact with the course to achieve the congruent course of the edge of the piston of the web edge.

To quickly adjust the rotary position of the pistons to the respective deflection direction can, the axial rotation of the piston is preferably through a gear to the Swivel movement of the turning bar coupled.

Embodiments of the invention are shown in the drawings and are in following described in more detail.

Fig. 1

eine schematisierte Draufsicht auf die Wendestange

Fig. 2

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

Fig. 3

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

Fig. 4

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

Fig. 5

einen Schnitt durch den Endbereich der Wendestange aus Fig. 1

Fig. 6

den mittleren Bereich der Wendestange in einem axialen Schnitt

Fig. 7

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

Fig. 8

einen Querschnitt durch eine Wendestange gemäß einer dritten Ausgestaltung

Fig. 9

eine schematische Darstellung von Wendestangen und ihrer Steuerung

Show it:

Fig. 1

a schematic plan view of the turning bar

Fig. 2

a side view of the turning bar of FIG. 1 in the direction of arrow II

Fig. 3

a partial section through the area marked III in Fig. 1 of the turning bar

Fig. 4

a cross section through the turning bar along the line IV-IV of Fig. 1st

Fig. 5

2 shows a section through the end region of the turning bar from FIG. 1

Fig. 6

the middle area of the turning bar in an axial section

Fig. 7

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

Fig. 8

a cross section through a turning bar according to a third embodiment

Fig. 9

a schematic representation of turning bars and their control

The turning bar 01 shown in FIG. 1 in plan view is a cylindrical hollow body which by a support arm 03 which engages approximately centrally on its jacket 02 with a (not shown) frame is connected. The support arm 03 has a joint 04, the one Pivotal movement of the turning bar 01 about an axis perpendicular to the plane of FIG. 1 by an angle of 90 °. The turning bar 01 is with the joint 04 through one Connector 06 connected, which in the end positions of the The turning bar 01 can be swiveled freely at one of two stops 07 of the support arm 03 abuts. The stops 07 are each adjustable in length in order to To be able to adjust the freedom of movement of the turning bar 01 to exactly 90 °.

One runs through the support arm 03, the joint 04 and the connecting piece 06 Compressed air supply line (not shown), through which an interior of the turning bar 01 with Compressed air is supplied. This interior is on the one hand by the coat 02 and another limited by two pistons 17 axially displaceable in the jacket 02, on the latter Structure will be discussed in more detail later with reference to FIG. 3. The coat 02 is on the half of its circumference facing away from the connector 06 with a regular Arrange holes 08 through which compressed air can escape from the interior can to an air cushion for a material web 09 deflected on the turning bar 01 form. This material web 09 is drawn transparently in FIG. 1, its edges 11 shown as dashed lines.

On the back of the jacket 02 facing away from the holes 08 are on both sides of the Connector two slots 12 in the longitudinal direction of the turning bar 01 with one Length I formed, one of which can be seen in the side view of FIG. 2. This FIG. 2 shows a view of the turning bar 01 in the direction of arrow II from FIG. 1 Each slot 12 extends a rod 13, the detector holder 14 or 15 with a connects the two pistons 17 already mentioned inside the turning rod 01. The Detector holder 14 here has the shape of a frame with an elongated hole in which one Detector unit consisting of two photocells 16 parallel to the longitudinal axis of the turning bar 01 is adjustable. As can be seen in FIG. 2, one of the two photocells 16 is behind up, the other down. In the position shown in Fig. 1 detects the after bottom oriented photo cell 16 of the detector holder 15 an edge 11 of the outgoing Material web 09. The upwardly oriented photocell 16 in the detector holder 14 detects one Edge 11 of the incoming material web 09.

If the turning bar 01 from that shown in solid lines in FIG. 1 End position is pivoted through 90 ° into its other end position, shown in dashed lines, the photocell 16 of the detector holder 15 oriented upwards detects an incoming one Edge 11, and the downward-facing photocell 16 of the detector holder 14 detects one tapered edge 11.

Fig. 3 is a partial section through the turning bar 01 of Fig. 1 in the in Fig. 1 with III marked area. This partial section shows part of the internal structure of the Turning rod 01 and in particular one of the two pistons 17 axially displaceable therein. The plane of the section is indicated by the dash-dotted line marked III in FIG. 2 specified. The cut 08 clearly shows the holes 08 and the slot 12 in Sheath 02 of the turning bar 01.

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

With this orientation of the piston 17, the edge section 22 is exactly parallel to one in the solid position shown in Fig. 1 of the turning bar 01 around this loop edge 11.

Align exactly around the course of the edge section 22 with the web edge 11 to be able to, an axial displacement of the piston 17 inside the turning bar 01 required. For this purpose, a threaded spindle 24 is used, which has a thread is engaged in the bottom 18 of the piston 17 and by one shown in more detail in FIG Motor 36 is driven in rotation. A second, driven by the same motor 36 Threaded spindle 26 passes through an opening in the bottom 18 without thread engagement in engagement with a thread in the bottom 18 of a trained analog to the piston 17 second piston 17, the piston 17 diametrically opposite in the turning bar 01 is housed.

A rod 27 with a square cross-section extends along the axis X-X and with little play through an opening in the bottoms 18 of both pistons 17. It is with an in Fig. 6 shown gear 44, 46, 27 firmly connected and serves to rotate the pistons 17 about the axis X-X in the event of a pivoting of the turning bar 01 between them 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 firmly connected to the already mentioned rod 13, on which the detector holder 14 is arranged. Through the ring 29 it is possible Piston 17 to rotate about the axis X-X without the detector holder 14 this Rotational movement must follow. A sealing strip 31 is also attached to the rod 13 extends over the entire length of the slot 12 open to the interior 21.

Fig. 4 shows this arrangement in a section at the line IV-IV in Fig. 1. The Sealing strip 31 is on its entire thickness in grooves 32 on both sides of the Slot 12 inserted so that it does not affect the rotatability of the piston 17. A bracket 33 can be located on the connector 06 facing the end of the slot 12 be attached, the sealing strip 31 even in a non-pressurized Holds the state of the interior 21 pressed against the jacket 02 and thus ensures that this develops its sealing effect as soon as compressed air is given into the interior 21 becomes.

Fig. 5 shows a section along the longitudinal axis X-X of the turning bar 01 through the 1 in FIG. 1 end region 34. In this end region 34 there is already mentioned motor 36 housed in a chamber which towards the pistons 17 (Up in Fig. 5) is limited by a plate 37. The plate 37 is by means of a Rolling bearing 38 is rotatably held in the jacket 02. The rod 27 stands with the plate 37 non-rotatably engaged. The threaded spindles 24; 26 are rotatable through the plate 37 carried out and carry at their ends inside the chamber a drive wheel 39; 41. One to the drive wheels 39; 41 complementary wheel 42 is on the drive shaft 43 of the motor 36 mounted. The drive shaft 43 is in the direction of the longitudinal axis X-X displaceable between the position shown in Fig. 5, in which the wheel 42 with the Drive wheel 39 is engaged, and an engagement position with the drive wheel 41. By a selective displacement of the drive shaft 43, the motor 36 can thus either Moving both pistons 17 can be used. The wheels 39; 41; 42 can friction wheels or Be gears; to facilitate the meshing of the wheels, the Drive wheels 39; 41 frusto-conical and the wheel 42 double frusto-conical be trained.

When the turning bar 01 is pivoted about the direction of deflection of the material web 09 to change, this requires, as already indicated above, a rotation of the pistons 17 by 180 °. The threaded spindles 24; 26 follow this rotation, so that in FIG Change seats. The motor 36 is not rotated, but the intervention of the Wheel 42 with one of the drive wheels 39; 41 remain during this rotation.

Of course, the selective adjustment of both pistons 17 with the help of only one Motor 36 also using a clutch mechanism other than that above described can be effected. It is also conceivable for each threaded spindle 24; 26 one to assign your own engine, which then at the end of the turning bar 01 could be attached, which is adjacent to the piston driven by the engine. This motor can be arranged stationary or in such a way that it can rotate Rod follows.

Fig. 6 shows a transmission for driving a 180 ° rotation of the pistons 17 in the case of a Swiveling movement of the turning bar 01 from one of its working positions to the other.

Reference numeral 44 denotes a section of a gear wheel or Gear segment, which is housed in the connector 06. This gear or gear segment 44 can be arranged stationary in the connecting piece 06 However, could also be coupled to the position of the turning bar 01 such that it in the case of a swiveling movement of the turning bar 01 performs a self-rotation. This gear or gear segment 44 meshes with a helical toothing another gear 46 which is rotatable about the longitudinal axis X-X of the turning bar 01 and that the free cross section of the interior 21 of the turning bar 01 essentially fills. This gear 46 is in Fig. 6 to the left of the longitudinal axis X-X in section and shown to the right of the axis in plan view. It is firmly connected to the rod 27. The Threaded spindle 26, which drives the piston 17 on the motor 36 the opposite end of the turning rod 01 is through a bore of the gear 46 passed freely rotatable. The threaded spindle 24, which is used to drive the motor 36 adjacent piston 17 is used, is rotatably supported in the gear 46. The gear or gear segment 44 and gear 46 are designed to be one Swiveling movement of the turning bar 01 by 90 ° around the axis of the joint 04 in one Implement 180 ° rotation of the gear 46 and thus the piston 17. This is how it ensures in Fig. 6 gear 44, 46, 27 that the pistons 17 in each of the two Working positions of the turning bar 01 in the rotating orientation adapted to it are located.

In order to adapt the turning bar 01 to the guidance of a new material web 09 z. B. proceed as follows. First, the pistons 17 in their Move the stop position adjacent to the ends of the turning bar 01. In the detectors are not one of these positions over the turning bar 01 guided material web 09 opposite. One from the detector unit in this state delivered signal level is interpreted as "forbidden" level. Then the Piston 17 from the stop positions to the center of the turning bar 01 move until the detector unit of the piston 17 registers a web edge 11 and you Output signal changes to an "allowed" level. Because in each of the two Working positions of the turning bar 01 of the two photocells 16 of each detector unit only one can lie opposite a web edge 11, it is sufficient for the evaluation of the Detector signal, an OR operation of each of the two photocells 16 Evaluate signals generated by the detector unit in order to reach the web edge 11 to be detected by the detector unit. In order to increase the detection security, it can also be provided that depending on the working position of the turning bar 01 of the two Photocells 16 of each detector unit only one is operated. A control circuit that performs this task is not specifically shown in FIG. 6.

If the position of the detector unit in the detector holders 14, 15 is correctly adjusted, then corresponds to the moment when the detector unit registers a web edge 11 which Position of the edge section 22 or 23 of the outside of the jacket 02 facing Piston 17 exactly the course of the edge 11 of the material web 09 on the turning bar 01. Thus, the two pistons 17 cut all those holes 08 on the jacket 02 of the Turning rod 01 from the compressed air supply from the interior 21, which is not from the Material web 09 to be covered; below the material web 09, however, a full-surface, homogeneous air cushions are generated.

7 shows a section through the end region of a turning bar 01 according to FIG second embodiment of the invention. The position of the cut is the same as in FIG. 5. Elements in the form or function of the elements described above Corresponding embodiment, are provided with the same reference numerals. The Plate 37 is rotatably connected to the jacket 02, the rod 27 is rotatable on the Plate 37 stored. The motor 36 drives via the wheels 42; 39 only the spindle 26 one of the Piston 17 on; a corresponding motor for the other piston is on other end of the turning bar 01. A through a slot 47 in the jacket 02nd engaging wheel 48 is in engagement with wheel 42; it transmits a rotation of the Motor 36 on an 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 such as the detector holder 14 from FIG. 1 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 design described above and the 7 is the arrangement of the detectors. With detectors it can are again photocells 16, for example. These photocells 16 are in the 8 in the interior of the turning bar 01, and they are in each case in the side wall 19 of the cylinders 17 in each case in the vicinity of the edge section 22; 23 so that they can record the presence of the web 09, provided that the Detectors are in front of one of the holes 08. In this embodiment, the Accuracy with which the position of the web edge 11 can be detected on the distance of holes 08 is limited in the axial direction, but this does the functionality of Device does not abort because the piston 17 inside the turning rod 01 to level this distance can be shifted without changing the number of open or blocked holes 08 changes.

In this embodiment, a flow sensor is also used as a detector applicable, which registers the flow of air from the interior 21 to the outside, if it passes a hole 08 that 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 rods 01, the z. B. following a cutting device are arranged in which a material web 09, in particular a printed paper web 09, is cut into a plurality of partial webs 09, each of one Turning rod 01 can be deflected. The position of the individual rotating knives 51 the cutting device is adjustable at a control station 54. A control signal that the Indicates the desired position of each knife 51, (not shown) adjusting units of the knife 51 supplied via a signal line 52. This control signal, which is also the location The edges 11 of the partial webs 09 cut by the knives 51 are defined as a control circuit 53 branched out, taking into account the positions the - adjustable across the web direction - turning rods 01 each a target position the cylinder inside the turning rods 01 is calculated and their motors are controlled in order to approach this target position.

Alternatively, the control signal could also be obtained using position detectors the position of the knives 51 or the web edges 11 generated by them in measure the cutting device.

In order to set the target position calculated in this way, the control circuit can adjust the actual position hold each cylinder in memory, the difference between the two Calculate positions and each motor at a known speed of rotation for so long operate until the piston has moved from the actual position to the target position would.

Alternatively, an operating state of the control circuit can be provided in which the Control circuit for adaptation to a changed web width or a changed Position of the turning bars first moves each piston to a stop position. If this is reached, a change is made to a control state in which the control circuit from this precisely known stop position, the target position by operation of the motor for a calculated angle of rotation or a calculated time with known Rotational speed starts.

Alternatively, there is a first actuating element for pivoting the turning bar and a second Adjusting element arranged for moving the locking element. The two control elements are electrically coupled.

LIST OF REFERENCE NUMBERS

01

turning bar

02

coat

03

Beam

04

joint

05

-

06

joint

07

attack

08

holes

09

web

10

-

11

Edge (09)

12

slots

13

Rod, beam

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

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 (16)

Turning bar (01) for deflecting a material web (09) which has a jacket (02) provided with holes (08) on at least part of its circumference and a compressed air-fed interior (21), at least one locking element (17) inside the turning bar ( 01) is arranged for the selective blocking of the holes (08) and the turning bar (01) on a frame can be pivoted through 90 ° about a pivot axis running transversely to its longitudinal axis (XX), the movement of the locking element (17) within the turning bar ( 01) and is coupled to the pivoting movement of the turning bar (01), the locking element (17) being movable within the turning bar (01) in the longitudinal direction of the turning bar, characterized in that the locking element (17) within the turning bar (01) additionally a rotational movement in the circumferential direction of the turning bar (01) is arranged in such a way that the turning movement of the locking element (17) is coupled to the pivoting movement of the turning bar (01). Turning rod (01) according to claim 1, characterized by a motor (36) for driving the axial displacement of the piston (17). Turning rod (01) according to claim 2, characterized in that the motor (36) can be rotated together with the piston (17). Turning rod (01) according to claim 2 or 3, characterized in that a second gear (17) for converting a rotation of the motor (36) into a displacement of the piston (17) arranged on the longitudinal axis (XX) on the motor shaft ( 43) coupled first wheel (42) and a second wheel (39) which is non-positively connected to the first wheel (42) and which, coupled to the rotary movement of the piston (17), is rotatable on a circular arc around the first wheel (42). Turning rod (01) according to claim 2, characterized in that a control circuit (53) operates the motor (36) in such a way that the piston (17) assumes a desired position defined by a control signal supplied to the control circuit (53). Turning rod (01) according to claim 5, characterized in that the control signal is a quantitative signal and that the control circuit (53) operates the motor (36) until a rotation path corresponding to the control signal has been covered. Turning rod (01) according to claim 6, characterized in that the control signal is a signal with two discrete states, and that the control circuit, if the control signal is in a forbidden state, operates the motor (36) until the control signal is in an allowed state Condition passes. Turning rod (01) according to claim 5, 6 or 7, characterized in that the control circuit (53) has an operating state for displacing the piston (17) into an end position independently of the control signal. Turning rod (01) according to claim 7, characterized in that a displaceable detector coupled to the piston (17) delivers the control signal. Turning bar (01) according to claim 9, characterized in that the detector comprises a photo cell (16). Turning rod (01) according to claim 9 or 10, characterized in that the detector is mounted on the piston (17). Turning bar (01) according to claim 11, characterized in that the jacket (02) of the turning bar (01) has a slot (12) and that the detector is arranged outside the jacket (02) and via a support (10) crossing the slot (12) 13) is connected to the piston (17). Turning bar (01) according to claim 12, characterized by a sealing tape (31) pressed by the air pressure of the interior (21) against the edges of the slot (12). Turning rod (01) according to claim 13, characterized in that the sealing tape (31) is coupled to the piston (17) and is displaceable in front of the slot (12). Turning bar (01) according to claim 11, characterized in that the detector (16) inside the piston (17) for detecting the presence or absence of the material web (09) is mounted in front of one of the holes (08). Turning bar (01) according to claim 1, characterized in that a first adjusting element for pivoting the turning bar (01) and a second adjusting element for moving the locking element (17) is arranged and these two adjusting elements are electrically coupled.

Images