DE20202708U1 - Multiple rotary screen station printing machine, especially for wallpaper, uses single magnet system to position rotary screen stations against counter roll - Google Patents

Abstract

A single magnet system (12) with at least one magnet is provided inside the hollow counter-roll (6). The magnet system can be moved between at least two different positions for the two or more rotary screen stations (1, 2). The printing machine comprises a frame, a rotary counter-roll and at least two rotary screen stations each including at least one rotary ink roll (25, 26). Each of the ink rolls can be brought into contact with the counter-roll individually in order to print a moving web of material (16) in between.

Description

PATENT ATTORNEY: :*. ^: ·&idigr;·. .γ. *,.·.· · · ·

DR.-ING. PETER RIEBÜNg"

Dipl.-Lng. EUROPEAN PATENT & TRADEMARK ATTORNEY

P.O. Box 3160 D-88113 Lindau (Bodensee) Telephone (08382) 78025 Telephone (08382) 9692-0 Fax (08382) 78027 Fax (08382) 9692-30 E-mail: info@patent-riebling.de

08.02. 2002 15418.7-T560N-58-kns

Applicant: Tima Tee

Mechanical and Plant Engineering GmbH Dröschitz 55
A-9220 Velden
Austria

Round stencil printing system

The invention relates to a rotary stencil printing system, in particular as a wallpaper printing machine according to the preamble of independent claim 1.

However, the round stencil printing system according to the invention should not only be able to print on wallpaper, but also on other band-shaped flexible materials, such as cardboard, textile fabrics, wood veneers, plastic or metal films, combinations of the aforementioned materials, etc.

Printing systems with several stations are already known from the state of the art of rotary stencil printing systems, where one or more of these rotary stencil stations are in operation in the working position and others are in preparation and are in waiting position, are being serviced or can be restocked.

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D-88131 Lindau VolksbärTkTündSi* (BfMr*5122?tfbO (BT2"65O92o1O) ** ** ** *Mi4848-808

VAT NO: DE 129020439 (BLZ 70010080)

The advantage over rotary stencil printing systems with just a single rotary stencil station is that you can change from a first color to a second color or from a first pattern to a second pattern without any time delay. With multiple rotary stencil stations, you can also achieve a more precise print quality, as there is no changeover with a position offset. Product waste and the loss of printing medium are also lower with multiple rotary stencil stations, as there is no changeover during the printing of a product.

DE 196 17 355 describes a rotary screen printing machine with several round stencil stations that work on a rotating flat printing blanket. Each of the round stencil stations can be individually lowered onto the printing blanket and lifted off it using a drive.

DE 34 20 304 A1 discloses a device for the continuous treatment of a carrier material, wherein several printing units are provided, each of which contains a stationary counter cylinder and a working cylinder movable relative to the counter cylinder.

The disadvantage of the known rotary stencil printing systems, however, is that each printing station is equipped with an individual drive for bringing it into working position, which is associated with considerable costs and additional space requirements.

From AT 400 115 B it is known to arrange a doctor blade for applying flowable substances to flat substrates within a round stencil or a screen cylinder. The doctor blade, which is pivotably mounted in a lever-like manner, is pressed against the substrate by an electromagnet which is arranged underneath the substrate.

The object of the present invention is to provide such a rotary stencil printing system with at least two rotary stencil stations in a more cost-effective and

with a smaller space requirement, without losing the time advantage when changing over from one round stencil station to the other.

The technical teaching of independent claim 1 serves to solve the problem.

An essential feature here is that a single magnet system with at least one magnet is arranged within the hollow magnet roller, which magnet system can be positioned in at least two positions for the at least two round stencil stations.

The advantage of the magnetic system that can be moved within the hollow magnetic roller is that only a single magnetic system needs to be present, which can then be moved to the appropriate position within the hollow magnetic roller as required, depending on the activation of the first or second round stencil station.

There, the printing station, which is pivoted pneumatically via a central beam, is activated by attracting the squeegee and clamping the material.

It is advantageous here that the single magnet system is mounted on a magnet bar that can be rotated about a magnet bar axis, so that the magnet system can be moved from a first position for the first round stencil station to a second position for the second round stencil station by rotating the center axis of the magnet roller. This corresponds to a preferred embodiment for positioning the magnet system.

Of course, in another embodiment of the invention it is possible for the magnet system to be rotated into several other positions, so that one or more other of these round stencil stations, in particular double ones, can be arranged on the outside of the magnet roller and thus the flexibility of the printing system can be significantly increased.

In order to be able to adjust to different diameters of the magnetic roller without having to structurally change the magnet system and the magnet bar, the magnet bar axis can be axially and/or radially displaceable with respect to the rotation axis of the magnetic roller.

For a radial displacement, the magnetic beam axis is displaceably mounted, in particular within a slot in a bearing arm on each of the open end faces of the magnetic roller, so that a relative movement between the magnetic beam axis and the axis of rotation of the magnetic roller can be achieved and thus the magnetic system can be brought to the optimal distance from the inner surface of the magnetic roller and, if necessary, to the system.

Furthermore, it can be provided that the two bearing arms arranged outside the open end faces of the magnetic roller can be pivoted about a frame-fixed axis of rotation, so that a relative movement between the magnet bar axis and the axis of rotation of the magnetic roller can also be achieved in this way. To synchronize the pivoting of the two bearing arms, they are firmly connected to one another on the side opposite the frame-fixed axis of rotation via a cross brace.

However, the structural design of the displacement of the magnet system within the hollow magnet roller should remain completely free within the scope of the invention, so that other rotation mechanisms and/or axial and/or radial displacement mechanisms should also be included in the invention.

For this purpose, it would be possible, for example, to arrange guides (e.g. dovetail guides) in the area of the inner surface of the magnetic roller on a rigidly arranged additional hollow roller (e.g. concentric to the magnetic roller), which provides a displacement option for the magnetic system either in the circumferential direction or in the axial direction of the magnetic roller.

The circumferential guidance has the advantage that the conversion can be carried out much faster, in contrast to the guidance of the magnet system in the axial direction, where the entire magnet system is guided from the interior of the

additional hollow rigid roller, then rotated circumferentially and then inserted into another axial guide.

All positioning options of the single magnet system within the hollow magnet roller can of course also include a locking system, which secures the position of the magnet system if the magnetic force is not sufficient.

The positioning of the single magnet system can also be done by hand, but also by motor, for example, using electric motors, which is particularly advantageous when the printing system is larger.

Advantageously, the magnet system with its contact surface is adapted to the shape of the inner surface of the magnetic roller and can be brought to an optimal distance (up to the contact) from this surface so that the maximum magnetic effect can be achieved and thus the round stencil stations are pressed against the hollow magnetic roller with maximum force.

In one version, all of the rollers, i.e. the two color rollers of the two round stencil stations and also the magnetic roller, are not actively driven by a motor drive and are only rotated by pulling the material to be printed through. In other versions, however, at least one of these rollers can be actively driven by a motor in order to achieve special color effects on the material to be printed, or if no external motor is provided for conveying the material to be printed.

However, a single circular stencil drive with a single motor and switching for the respective station in the working position of the two circular stencil stations is preferred.

The invention is explained in more detail below with the aid of the accompanying figures, which are to be interpreted as non-limiting examples only. The figures show further features, advantages and applications of the invention.

Show it:

Figure 1: a perspective view of the rotary stencil printing system according to the invention with a double rotary stencil station;

Figure 2: a side view in the direction of arrow II according to Figure 1 of the rotary stencil printing system according to the invention.

The basic frame 3 for the rotary stencil printing system according to the invention consists of a base frame which is formed from horizontally perpendicular I-beams 3a, 3b on which a base plate 3h rests. A railing 3i is attached to the front of the printing system as protection against unintentional entry into the printing system.

At the rear, two vertical rectangular tubes 3d are provided, the upper free ends of which are connected by a cross member 3e.

On the floor side, a stiffening plate 3c on each side forms a connection between the horizontal I-beams 3b and the vertical tubes 3d.

At the upper free end of the tubes 3d there is a bearing shell 20, in the central bore 21 of which the magnetic roller 6 is received and rotatably mounted.

On the respective front side of the bearing shells 20 (in the direction of the railing 3i) an eye 22 is formed, which serves to receive the pivot axis 10 for the two round template stations 1, 2, and about which pivot axis 10 the round template pair 1, 2 can then be pivoted back and forth in the arrow directions 19.

In the area of the eyes 22 of the bearing shells 20, a bone-shaped part 23, 24 in the form of an "8" is rotatable in the direction of the arrow on the pivot axis 10.

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, whereby the paint roller 25 for the round stencil station 1 and the paint roller 26 for the round stencil station 2 are each rotatably mounted in the two openings of this "8". In the middle of the "8" of the bone-shaped parts 23, 24 there is a hole through which the pivot axis 10 extends and is rotatably mounted there.

Figures 1 and 2 show the situation in which the rotary stencil station 1 is currently in operation and is being pulled towards the magnetic roller 6 by the magnetic system 12 and the medium 16 to be printed on is enclosed between them and is transported upwards out of the printing system in the transport direction 17.

The transport of the medium 16, which runs underneath the base plate 3h, takes place from the base frame 3a, 3b, around the deflection roller 8, then between the round stencil station 1 and the hollow magnetic roller 6 and upwards out of the printing system. A transverse stop plate 3f is also provided on the base plate 3h, which limits and secures the access area to the moving part of the printing system for the user.

The circular stencil station 2 is not in operation in Figures 1 and 2 and can therefore be serviced or replaced by a circular stencil station of a different color.

To prevent paint from dripping onto the floor 3h, a tray 9 is arranged beneath the round stencil station 2, which is designed to be displaceable in the horizontal sliding direction 18 via a sliding extension 3g and catches the excess, dripping paint from the round stencil station 2, since the latter does not rotate and therefore does not release any paint onto the medium 16 and therefore tends to drip. The displacement of the tray 9 is necessary because of the two possible extreme positions at the end of the sliding directions 18 of the round stencil station 2.

The magnet system 12 according to the invention is now arranged within the hollow magnet roller 6, which consists of one or more permanent and/or

Electromagnets 14 (typically 6 in a row) are arranged on a magnetic bar 5 that runs approximately axially inside the hollow magnetic roller 6. This magnetic bar 5, which runs approximately parallel to the axis of symmetry of the magnetic roller 6, is located on an axially segmented, cylindrical, hollow drum 27, which is closed at its end faces by equally segmented disks 28 that are connected in a rotationally fixed manner to the magnetic bar axis 11 and contain holes 29 for weight reasons.

This axially segmented drum 27 is rotatably mounted via the magnet beam axis 11 within a bearing 13 on one bearing arm 15 per bearing shell 20. These bearing arms 15 are located outside the interior of the magnet roller 6 and are each connected to the associated bearing shell 20 in an articulated and fixable manner via a magnet beam adjustment 4 and to each other on the opposite side via a cross brace 30, so that the left bearing arm 15 is rigidly connected to the right bearing arm 15 for synchronization. The bearing arm 15 can therefore be pivoted around the axis of the magnet beam adjustment 4 and the magnet system 12 and thus its magnets 14 can be optimally brought into the desired position on the inner wall of the magnet roller 6.

A further adjustment possibility results from the fact that the magnetic bar axis 11 is accommodated within a slot 7 in the bearing arm 15, so that here too the magnet system 12 can be moved relative to the magnet roller 6.

In Figure 2 it can be seen in particular that the round stencil station 1 is magnetically attracted to the magnetic roller 6 by the magnets 14, whereby by rotating the magnet system 12 about the magnet bar axis 11 in the area of the round stencil station 2, this other station is then attracted to the magnetic roller 6, so that the double round stencil station 1, 2 is pivoted about the pivot axis 10 in the arrow directions 19 (Figure 1), so that the round stencil station 2 is then rotated into the working position and the round stencil station 1 into the setup position.

By providing a displaceable magnet system 12 within the hollow magnet roller 6, a cost-effective printing system can be provided, since a second magnet system for the second round stencil station 2 can be completely dispensed with, since the single magnet system 12 can be displaced via almost any positioning options within the hollow magnet roller 6, in particular by rotating a magnet bar 5 on a drum 27.

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Drawing legend

1. Round stencil station

2. Round stencil station

3. Frame
3a,b I-beam 3c. stiffening plate 3d. vertical rectangular tube 3e. upper horizontal cross tube 3f. stop plate 3g. extension rail 3h. base plate 3i. railing

4. Magnetic bar adjustment

5. Magnetic bar

6. Magnetic roller

7. Long hole

8. Deflection roller

9. Tub (extendable)

10. Swivel axis for 1 and

11. Magnetic beam axis

12. Magnetic system

13th camp of 11

14. Magnet

15. Bearing arm

16. Print medium / wallpaper

17. Conveying direction for

18. Sliding directions for

19. Swivel directions for 1 and

20. Bearing shell

21. central bore of

22. Bearing eye for

23. bone-shaped part

24.bone-shaped part

25. Paint roller

26. Paint roller

27. hollow segmented drum of

28. segmented disc of

29. Drilling in 28

30. Cross bracing

Claims (13)

1. Round stencil printing system, in particular as a wallpaper printing machine, with a frame ( 3 ) and a rotatable counter-pressure roller ( 6 ) and at least two round stencil stations ( 1 , 2 ) each with at least one rotatable ink roller ( 25 , 26 ), wherein the round stencil stations ( 1 , 2 ) can each be individually brought into contact with the counter-pressure roller ( 6 ) in order to clamp a material to be printed ( 16 ) between them and thus to print on it during conveyance, characterized in that only a single magnet system ( 12 ) with at least one magnet ( 14 ) is arranged within the hollow counter-pressure or magnet roller ( 6 ), which magnet system ( 12 ) can be positioned in at least two different positions for the at least two round stencil stations ( 1 , 2 ). 2. Round stencil printing system according to claim 1, characterized in that the at least two round stencil stations ( 1 , 2 ) are pivotally mounted in pairs on a common pivot axis ( 10 ). 3. Round stencil printing system according to one of claims 1 or 2, characterized in that the single magnet system ( 12 ) contains several magnets ( 14 ). 4. Round stencil printing system according to claim 3, characterized in that the magnets ( 14 ) are permanent magnets and/or electromagnets. 5. A rotary stencil printing system according to one of claims 3 or 4, characterized in that the plurality of magnets ( 14 ) are arranged approximately parallel to the axis of rotation of the hollow magnetic roller ( 6 ). 6. Round stencil printing system according to one of claims 1 to 5, characterized in that the at least one magnet ( 14 ) is cylindrical. 7. Round stencil printing system according to one of claims 1 to 6, characterized in that the surface of the at least one magnet ( 14 ) facing the hollow magnetic roller ( 6 ) is adapted to the shape of the inner surface of the magnetic roller ( 6 ). 8. Rotary stencil printing system according to one of claims 1 to 7, characterized in that the at least one magnet ( 14 ) has a small distance in the mm range from the inner surface of the magnetic roller ( 6 ) in the operating position or rests on the inner surface of the magnetic roller ( 6 ) and has a sliding and low-wear contact surface. 9. Rotary stencil printing system according to one of claims 1 to 8, characterized in that the positioning of the single magnet system ( 12 ) takes place via a rotary movement and/or an axial and/or radial displacement movement of the magnet system ( 12 ) with respect to the axis of rotation of the hollow magnet roller ( 6 ). 10. Round stencil printing system according to one of claims 1 to 9, characterized in that the at least one magnet ( 14 ) is mounted on a magnet bar ( 5 ), which magnet bar ( 5 ) is rotatable about a magnet bar axis ( 11 ), which magnet bar axis ( 11 ) runs approximately parallel to the axis of rotation of the hollow magnet roller ( 6 ) or coincides with it. 11. Round stencil printing system according to claim 10, characterized in that the magnet bar axis ( 11 ) is displaceably mounted in a slot ( 7 ) of a bearing arm ( 5 ) connected to the frame ( 3 ) on both end faces of the hollow magnet roller ( 6 ), which displacement takes place approximately perpendicular to the axis of rotation of the hollow magnet roller ( 6 ). 12. Round stencil printing system according to one of claims 10 or 11, characterized in that the bearing arm ( 5 ) on both end faces of the hollow magnetic roller ( 6 ) is mounted at its one free end so as to be rotatable about an axis of the magnetic bar adjustment ( 4 ), which runs approximately parallel to the axis of rotation of the hollow magnetic roller ( 6 ), and with its other free end via a cross brace ( 30 ) to the other bearing arm ( 5 ) on the opposite end face of the hollow magnetic roller ( 6 ). 13. Round stencil printing system according to one of claims 10 to 12, characterized in that the magnet bar axis ( 11 ) is connected in a rotationally fixed manner to a segmented circular disk ( 28 ) which closes off an axially segmented hollow drum ( 27 ) at the front, wherein the magnet bar ( 5 ) on which the at least one magnet ( 14 ) is located is placed on the segmented circumferential surfaces of both circular disks ( 28 ).