WO2004016434A1

WO2004016434A1 - Separating device for cutting a running web of material

Info

Publication number: WO2004016434A1
Application number: PCT/DE2003/002375
Authority: WO
Inventors: Martin Richard Keller; Gerd Erich Stettner
Original assignee: Koenig & Bauer Aktiengesellschaft
Priority date: 2002-07-27
Filing date: 2003-07-15
Publication date: 2004-02-26
Also published as: EP1525097A1; AU2003257388A1; DE10234248B4; DE10234248A1

Abstract

Disclosed is a separating device for cutting a running web of material. Said separating device comprises a movable knife and can be moved between an operating position and a servicing position.

Description

description

Cutting device for cutting a running material web

The invention relates to a separating device for severing a running material web according to the preamble of claim 1, 4 or 6.

Such devices are used in paper machines such. B. Web presses. However, you can also use any other machine that runs material webs such as Process plastic sheeting or metal sheeting, are used.

EP 0 693 377 B1 shows a device for cross-cutting a paper web moved by pressing two cylinders by means of a rotatable shaft slotted slightly longer than paper web width, the paper web being guided through the slot and the shaft being mounted in two side frame plates and in the direction of the paper web running is arranged near an inlet gusset of the two cylinders. In the event of a malfunction of the paper web, the shaft rotates about its axis, in which the paper web is cut at one edge of the slot and then wound up on the shaft, and by means of a longitudinally movable bearing in the side frames, in addition to and simultaneously with the winding rotational movement, a movement counter to a movement the direction of the paper web. It is excluded that, after cutting out the ^slides' paper web from the slot and not wound up. The device shown also has a roller chain to facilitate the retraction of the paper web.

DE 38 22 497 A1 discloses a separating device for preventing machine damage in web-fed rotary printing presses. The separating device can be pivoted up about a pivot axis arranged in the direction of web travel. DE 195 29 581 A1 shows several exemplary embodiments of devices for cross-cutting a running web.

The invention has for its object to provide a cutting device for cutting a running web of material.

The object is achieved by the features of claim 1, 4 or 6.

The separating device can be moved between a working position and a maintenance position. By pivotally connecting the frame to the side frame plates and pivoting it from the working position in which the knife extends to cut the material web into the parked maintenance position, access to the knife is opened. This makes maintenance work in the parked position easy to access. However, a possible material jam after a material web break can be easily removed after pivoting the frame into the parked position, since the distance between the separating device and the material web in the maintenance position is greater than the distance between the separating device and the material web in the working position. The distance between the material web and the knife tip of the separating device is referred to as the distance.

The separating device can also be easily adjusted in the parked position.

The separating device preferably has a stop on which the frame strikes in the parked position and on which the separating device can be held for maintenance purposes.

The separating device is preferably fixed in the employed position by at least one bolt which extends through bores in the frame and the side Frame plates extends. The bolt is pluggable and can be easily removed to release the frame before pivoting.

In a particularly preferred embodiment of the invention, the frame is constructed from a housing and side plates, each side plate being articulated to a side frame plate. The housing can be locked on the side plates in positions with different distances from the material web. With this design, a distance of the separating device from the material web can be optimally adjusted.

In this embodiment, the knife can preferably be extended through a slot in the housing, which in the set position faces the separating device of the material web. In principle, the slot can be of any width as long as the knife can be extended. However, a sufficiently large slot width is preferably selected so that easy access to the knife is ensured in the parked position of the separating device during maintenance work.

An actuator is responsible for retracting and extending the knife. A hydraulic actuator can be used as an actuator, but a pneumatic actuator is preferred, since in the case of pneumatic actuators in the event of a leak in the actuator or the supply lines, the surroundings of the separating device are not contaminated and because in pneumatic actuators the pressure required to extend the knife is faster can be built up, which extends the knife with greater force and facilitates cross cutting of the material web.

The pneumatic actuator is preferably a cylinder arranged outside the housing and a piston rod which acts on the knife located therein through an opening in the housing. By building up pressure in the cylinder, the piston rod is extended and the knife attached to it is moved forward. Since the material web is running, material knocks against the knife occur when the web is knocked off. These material impacts are transferred from the knife to the piston rod. In order to prevent these impacts from the piston rod and to relieve the piston rod, the knife is preferably fastened to the actuator via at least one spring. The spring is preferably a plate spring.

The knife can be constructed in two parts and consist of a blade and a holder on which the blade is attached. In this case, a holder with an L-shaped cross section is preferred which has a first leg and a second leg which are at a right angle to one another and in which the first leg of the holder is connected to the actuator, while the second leg carries the blade.

The housing preferably has at least one front section facing the material web. The front section keeps the running material web away from the knife retracted into the housing under normal operating conditions and prevents accidental cutting or damage to the material web if there are irregularities in the course of the material web or fluttering of the material web. Rails guide the knife as it moves from the retracted position to the extended position and back.

The blade can preferably be fastened in different positions on the holder in the direction of displacement of the actuator. It is thus possible to set the separating device for different material web courses.

The separating device is advantageously arranged on a deflection roller for the material web, preferably behind the deflection roller. Nearby and especially behind the deflection roller, the resistance of the material web against a lateral deflection is particularly high, and this ensures that the knife actually penetrates the material web when it is extended and does not only push to the side. In addition, there is also no fluttering of the material web, which could lead to unintentional contact with the knife and tearing of the material web.

In order to prevent an operator from injuring himself after removing the material web from the knife after an emergency stop of the material web, a cover element for covering the extended knife is preferably arranged on an opposite side of the material web. This cover element, together with the frame of the separating device and the deflecting roller, preferably forms a chamber around the blade of the knife that is closed except for passage gaps for the material web.

The separating device with its various configurations is preferably arranged in web printing machines with which paper webs are processed.

An embodiment of the invention is shown in the drawings and is described in more detail below.

Show it:

1 shows a plan view of the device from the viewing direction designated by X in FIG. 3;

FIG. 2 shows a cross section through the device along the line designated by A-A in FIG. 3;

3 is a front view of the separating device; 4 shows a cross section through the device with a frame set down from the material web;

Fig. 5 shows a further cross section through the device.

Fig. 1 shows a z. B. in a web press for a web 02, z. B. paper web 02 (FIG. 2) arranged separating device in a plan view, which corresponds to the viewing direction designated as X in FIG. 3. An outer frame 03 can be seen from the separating device, which consists of a housing 09 and two side plates 11. The separating device is arranged between two side frame plates 01 and is locked to each of them with a locking pin 13. The side plates 11 protrude from the housing 09 so that the locking bolts 13 can be inserted through the frame 03, more precisely, through the two side plates 11 of the frame 03, into the two side frame plates 01.

Two actuators 06, which are pneumatic lifting cylinders 06, are arranged on the housing 09. Their function is explained in more detail below.

In the position of the separating device shown in FIG. 1, the separating device lies against a deflection roller 07 mounted between the lateral frame plates 01. A cover 31 is also provided between the side frame plates 01. During operation of the web printing machine, a paper web (not shown in FIG. 1 for the sake of clarity) is guided around the deflection roller 07 and exits between the housing 09 of the frame 03 and the cover 31.

In addition, recesses 21 on the sides of the housing 09 can be seen in this illustration. The recesses 21 allow a pulling device for threading the paper web, not shown, into the web printing machine in a simple manner to guide the device. The pulling device is generally a chain, so-called roller chain, which is guided on both sides through the recesses 21 and runs through the entire web printing machine along a designated path of the paper web. The paper web is attached to the roller chains. By pulling the roller chains through the roll printing machine, they pull the paper web with them through the machine and thereby thread the paper web into the machine.

A cross section through the device along the line designated A-A in FIG. 3 is shown in FIG. 2. In this illustration, the paper web 02 guided around the deflecting roller 07 is drawn in, coming from the left, is wrapped around the deflecting roller 07 and exits between the cover 31 and the housing 09 of the frame 03. An arrow indicates the direction of travel of the paper web 02. In accordance with the direction of travel of the paper web 02, the separating device is arranged on the output side of the deflecting roller 07.

FIG. 2 shows a cross section of the separating device in a first working position in a position set on the deflecting roller 07. The cross section shown in FIG. 2 shows a knife 04 which is arranged inside the housing 09 of the frame 03 and which extends from the housing 09 in order to sever the paper web 02. It consists of a blade 16 and a holder 17 to which the blade 16 is attached. In the illustrated embodiment, the holder 17 of the knife 04 has an L-shaped cross section. A first leg 27 of the holder 17 is fastened to a piston 24 of the lifting cylinder 06 with screws 18, while the blade 16 is fastened to a second leg 28 by means of screws 29 which extend through elongated holes in the blade 16. The blade 16 can therefore be fastened on the leg 28 in various positions.

It is both between the head of the screw 18 and the first leg 27 of the holder 17 and between the first leg 27 of the holder 17 and the piston 24 of the lifting cylinder 06 each have a plate spring 26. The piston 24 projects through an opening into the housing 09, so that the lifting cylinder 06 is arranged outside the housing 09.

Guide rails 08 are provided on the lateral longitudinal ends of the holder 17 and are explained in more detail with reference to FIG. 3. The knife 04 and the guide rails 08 are enclosed by the housing 09 of the frame 03. It can also be seen that the housing 09 has elongated holes 22 on its sides through which screws 23 are passed in order to connect the housing 09 and the side plates 11 together to form the frame 03. As a result of the elongated holes 22, the housing 09 can be moved relative to the side plates 11 and can be locked in positions with different distances from the material web 02.

The two side plates 11 are each articulated to the side frame plates 01 by means of a fitting screw 12. The two locking bolts 13, one of which is covered by one of the lifting cylinders 06 in FIG. 2 and is therefore drawn in dashed lines, each extend through the holes in the side plates 11 and the frame plates 01 and thus hold the separating device in the employed position.

During the operation of the web printing machine, an upper front section 32 of the housing 09 ensures that the paper web 02 does not come too close to the knife 04 or the blade 16 under undisturbed operating conditions of the web printing machine.

A lower front section 33 of the housing 09 prevents a trailing paper web from penetrating into the housing 09 after the paper web 02 has been knocked off and there leads to a paper jam.

By acting on the piston 24 of the lifting cylinder 06 with compressed air, the knife 04 extended out of the housing 09 and severed the paper web 02. To protect against contact of the extended blade 16, a protective cover is provided on a side of the paper web 02 opposite the housing 09. In this embodiment, it is formed by the deflecting roller 07 itself and by a plate-shaped cover 31.

Since the paper web 02 is a running web 02, mechanical impacts, so-called paper blows, are exerted on the knife 04 at the moment of cutting through the paper web 02. The paper blows push the knife 04 away from the paper web 02 and represent a mechanical load both for the knife 04 and for the piston 24 of the lifting cylinder 06. The knife rail 04 is prevented from being pushed away while the paper blows from the plate springs 26 are caught and prevent mechanical impacts from being passed on to the piston 24. The piston 24 is thereby protected from the paper blows and relieved.

3 shows the separating device according to the invention arranged between two side frame plates 01 in a front view. You can see the frame 03, consisting of the housing 09 and the two side plates 11, the knife 04 and two lifting cylinders 06, which are covered by the housing 09 and are therefore shown in broken lines.

3 shows the separating device as in FIGS. 1 and 2 in the set position, but to increase clarity without the deflecting cylinder 07, the paper web

02 and the cover 31. In this position it is held by the two locking bolts 13 and secured against tipping. The locking bolts 13 are inserted through the side plates 11 of the frame 03 into the side frame plates 01 and shown in dashed lines in the figure, since they are invisible behind the frame in this view

03 are located. If the locking bolts 13 are removed, the frame 03 is around the Fitting screws 12 can be pivoted and can be tilted into a parked position in which the side plates 11 each rest on stops 14 projecting from the frame plates 01.

The housing 09 has a recess 21 for a pull-in device both on the left side and on the right side.

The guide rails 08 in the embodiment shown are slotted, rectangular components fastened from the inside to the housing 09, in which the knife 04 either with the blade 16 or with the blade 16 together with the first leg 28 of the holder 17 into the slot intervenes. As a result, the knife 04 is guided through the slots 19 when it is extended.

FIG. 4 shows the frame 03 in a folded position, which is set down from the material web 02. The frame 03 lies on the stop 14, which in this figure is covered by the lifting cylinder 06 and is therefore shown in broken lines, and is tilted by 90 ° with respect to the position shown in FIG. In this way, the knife 04 is made accessible via the slot 19 for any maintenance and assembly work.

Before the cutting device is put into operation, it is first set to the running material web 02 in the parked position. For this purpose, the blade 16, which can be fastened to the holder 17 in various positions, is brought into a desired position and fastened to the holder 17 with the screws 29. Then the housing 09, which can be displaced as a result of the elongated holes 22 relative to the side plates 11, is brought into a desired position and is connected to the side plates 11 by means of the screws 23, so as to form a stable frame 03. Finally, the separating device is erected and brought into the position shown in FIG. FIG. 5 shows the separating device according to FIG. 2 in a second working position. The distance between the separating device and the material web 02 remains essentially the same in both working positions and is in particular <10 mm. In particular, the separating device pivots about the axis of rotation 34 of the deflection roller 07.

A major advantage of the illustrated embodiment of the separating device is its great ease of assembly and maintenance. Since the separating device can be swiveled, easy access to the knife 04 can be made very quickly and easily during any maintenance and assembly work.

The invention is not limited to the illustrated embodiment. Rather, many alternative changes to the embodiment shown are possible without departing from the inventive concept. For example, the shape of the housing 09 is not limited to the cross section shown. The housing 09 can also have an L-shaped cross section, for example. Several alternative embodiments are also conceivable for the knife 04. Thus, the holder 17 is not necessarily limited to an L-shaped cross section. It can also be a simple plate, for example, which is not screwed to the piston 24 but clamped thereon. The blade 16 can also be clamped on the holder 17. An uneven load on the knife 04 and thus the actuators 06 for retracting and extending is compensated for by spring elements 26 (disc spring or other). Uneven loading occurs when narrow paper webs 04 (e.g.% wide) run out of the middle. Also, the guide rails 08 need not necessarily be the slotted blocks shown. To prevent the knife 04 from being pushed away by the paper web 02 during cross-cutting, flange-shaped stops are also suitable, against which the knife 04 is pressed by the paper web 02 in the running direction of the paper web 02 and which counteract this pressure. LIST OF REFERENCE NUMBERS

01 frame plates, side

02 web, material web, paper web

03 frame, outer

04 knives

05 -

06 Actuator / lifting cylinder

07 Deflection roller, deflection cylinder

08 guide rail

09 housing

10 -

11 side plates

12 fitting screw

13 locking bolts

14 stop

15 -

16 blade

17 holders

18 screw

19 slot

20 -

21 recess

22 slot

23 screw

24 pistons

25 -

26 spring, disc spring

27 legs, first 28 legs, second

29 screw

30 -

31 Cover, cover element

32 front section, upper

33 front section, lower

34 pivot point

X viewing direction

A-A line

Claims

Expectations

1. Separating device for cutting through a running material web (02) with a movable knife (04), the separating device having a working position and a maintenance position, characterized in that a pivot axis of the separating device is arranged transversely to the web running direction.

2. Separating device according to claim 1, characterized in that in the working position a distance of the separating device to the material web (02) is not equal to a distance of the separating device to the material web (02) in the maintenance position.

3. Separating device according to claim 1, characterized in that in the working position the distance of the separating device to the material web (02) is smaller than the distance of the separating device to the material web (02) in the maintenance position.

4. Separating device for severing a running material web (02) with a movable knife (04), characterized in that the separating device has at least a first working position and a second working position.

5. Separating device according to claim 4, characterized in that a distance of the material web (02) to be separated is essentially the same in both working positions.

6. Separating device for severing a running material web (02) with a movable knife (04), characterized in that the knife (04) is linearly movable.

7. Separating device according to claim 6, characterized in that the actuator (06) is arranged executing a linear movement.

8. Separating device according to claim 1 or 4, characterized in that a frame (03) of the separating device between at least two positions is pivotally connected to side frame plates (01).

9. Separating device according to claim 1 or 4, characterized in that at least one stop (14) is arranged on which the separating device strikes in the maintenance position.

10. Separating device according to claim 1 or 4, characterized in that at least one bolt (13) which is in the working position through the frame (03) in one of the side frame plates (01) is arranged and prevents tilting of the separating device.

11. Separating device according to one of the preceding claims, characterized in that the frame (03) is constructed from a housing (09) and side plates (11), each side plate (11) being articulated to a frame plate (01) and the housing ( 09) on the side plates (11) in positions with different distances from the material web (02).

12. Separating device according to claim 1, 4 or 6, characterized in that the knife (04) is extendable through a slot (19) in the housing (09) which faces the material web (02) in the working position.

13. Separating device according to claim 7, characterized in that the actuator (06) is a pneumatic actuator (06).

14. Separating device according to claim 13, characterized in that the pneumatic actuator (06) has a cylinder (07) which is arranged outside the housing (09), and a piston rod (24) which through an opening of the housing (09) attacks the knife (04).

15. Separating device according to one of the preceding claims, characterized in that the knife (04) on the actuator (06) via at least one spring (26) is attached.

16. Separating device according to claim 15, characterized in that the spring (26) is a plate spring (26).

17. Separating device according to one of the preceding claims, characterized in that the knife (04) consists of a blade (16) and a holder (17) with an L-shaped cross section, the holder (17) having a first leg (27) , which is connected to the actuator (06), and has a second leg (28) which carries the blade (16).

18. Separating device according to one of the preceding claims, characterized in that the housing (09) has at least one front section (32; 33) facing the material web (02).

19. Separating device according to one of the preceding claims, characterized in that with the housing (09) fixedly connected rails (08) for guiding the displacement of the knife (04) are arranged.

20. Separating device according to one of claims 17 to 19, characterized in that the blade (16) in the displacement direction of the actuator (06) can be fastened to the holder (17) in different positions.

21. Separating device according to one of the preceding claims, characterized in that the separating device is arranged on a deflecting roller (07), preferably behind the deflecting roller (07).

22. Separating device according to claim 1, 4 or 6, characterized in that a cover element (31) for covering the extended knife (04) is arranged on one side of the material web (02).

23. Separating device according to one of the preceding claims, characterized in that the separating device is arranged in a web printing machine.

24. Separating device according to claim 1, 4 or 6, characterized in that the separating device can be pivoted parallel to an axis of rotation of an associated deflecting roller (07).

25. Separating device according to claim 1, 4 or 6, characterized in that a pivot axis of the separating device is arranged parallel to a web running plane.

26. Separating device according to claim 1, 4 or 6, characterized in that the knife (04) the material web at a distance of less than 200 mm before or after the contact zone of the material web (02) on a deflection roller is arranged to sever the material web (02).