WO2009030301A1

WO2009030301A1 - Rotary screen printing press

Info

Publication number: WO2009030301A1
Application number: PCT/EP2008/005530
Authority: WO
Inventors: Karl M. Wechselberger; Markus Hauser
Original assignee: Mhm Siebdruckmaschinen Gmbh
Priority date: 2007-08-29
Filing date: 2008-07-07
Publication date: 2009-03-12
Also published as: CN101918218B; DE202007012059U1; EP2183110A1; CN101918218A; EA016572B1; EP2183110B1; EA201070165A1; ATE495894T1; DE502008002419D1

Abstract

The invention relates to a rotary screen printing press with at least one cylindrical stencil, an ink applicator, which is disposed in the cylindrical stencil, a first end ring and a second end ring, which are mounted at the free ends of the cylindrical stencil, a first and a second bearing ring, each of which is connected over a fastening device with the adjacent end ring and have a pivot bearing for mounting the cylindrical stencil at a frame, so that it can rotate about the axis of rotation of the cylinder, and mounts, which are disposed at the frame for accommodating the bearing rings, wherein at least one mount has a U-shaped housing base, which is open in the upward direction, and two housing segments, which are mounted movably thereto for detachably enclosing an accommodated pivot bearing, wherein the housing segments enclose the bearing ring in ring-shaped fashion and form a closed accommodating housing, and that, with the bearing rings disposed in the mounts, the cylindrical stencil with the end rings can be detached from and removed from the bearing rings.

Description

Rotary screen printing machine

The invention relates to a rotary screen printing machine with the features of the preamble of claim 1.

Such a rotary screen printing machine comprises at least one cylinder stencil, an inking device, which is arranged in the cylinder template, a first and second end ring, which are respectively mounted on a free end of the cylinder template, a first and second bearing ring, each via a fastening device with the adjacent end ring are connected and a pivot bearing for supporting the cylinder template on a frame rotatable about a cylinder axis of rotation, and arranged on the frame receptacles for receiving the bearing rings, wherein at least one receptacle an upwardly open, approximately U-shaped housing base and two movably mounted thereto housing segments for releasably enclosing a recorded rotary bearing.

A generic rotary screen printing machine is known from DE 30 44 410 A1. In this rotary screen printing machine, the cylinder templates are arranged in a so-called open storage. In this case, upwardly open receptacles are provided, in which the bearing rings are arranged with the rotary or roller bearings of the cylinder template. For a mounting of the pivot bearing is taught to secure it by lateral segment-like holding pieces. The holding pieces are spaced apart in the closed position.

From DE 203 10 859 U1 a rotary screen printing machine is known, which also has an open storage of the cylinder templates. To reduce the weight when removing the cylinder template, the pivot bearings are formed divisible. Here, the outer bearing ring with the rolling elements hinged on the frame of Machine arranged. The inner raceways of the pivot bearing, however, are attached to the end heads of the cylinder template.

An open template storage allows installation and removal of the entire stencil with a paint applicator. These can then be separated from each other at a distance from the machine. This open storage allows a quick setup of larger units, but problems can occur during the repeat.

In contrast, the so-called closed storage offers the possibility that a bearing ring with the drive wheel when removing the screen printing stencil with the drive remains in meshed connection, so that the repeat is secured. For stencil change, however, it is necessary to pre-remove the inking device from the inside of the screen printing stencil. This can be cumbersome and time consuming with larger template lengths. Furthermore, the closed storage offers increased stability.

The invention is therefore based on the invention to provide a rotary screen printing machine, which allows efficient and highly flexible setup with high stability.

The object is achieved according to the invention by a rotary screen printing machine having the features of claim 1. Preferred embodiments of the invention are indicated in the dependent claims.

The rotary screen printing machine according to the invention is characterized in that the housing segments enclose the bearing ring in an annular manner and form a closed receiving housing and that when the bearing rings are arranged in the receptacles, the cylinder template with the end rings can be detached and removed from the bearing rings.

With the machine according to the invention, the changeover from closed to open storage is possible at any time without special tools. It is even possible to switch to a different setup process during the production process.

The erfiπdungsgemäße machine allows a setup as in a closed template storage. Here, the inking device, which is usually from a paint tube or a squeegee device, pulled laterally out of the template. The cylinder template is decoupled from the bearing rings with the drive and clamping device and lifted up out of the machine and transported away to the side. The insertion of the cylinder template and the insertion of the inking device takes place in the reverse order. An essential feature of this setup technique is that the separation or joining of stencil and inking device takes place on the machine. The elements for storage and drive of the template remain on the machine.

The closed storage ensures a precise, robust and stable storage of the cylinder templates. By the bearing rings, in particular on the drive side with the drive in combative connection, a repeat can be maintained during an intermediate cleaning of the template or when installing a replacement template. For smaller machine widths of up to 2 m, the closed storage also allows quick set-up, since, for example, a paint tube or a squeegee device can be removed from the interior of the tubular template relatively quickly and safely.

The advantages of the setup technology of the closed storage allows the rotary screen printing machine according to the invention, since the housing segments enclose the bearing ring completely annularly at least on the drive side and thus form a closed receiving housing. This closed housing may be arranged on one or both sides of the cylinder template. A two-sided arrangement is particularly useful when the template is driven from both sides. However, it is also possible a one-sided arrangement of the recording according to the invention, in particular when a drive of the cylinder template takes place from one side.

With the machine according to the invention, the setup technique after the open template storage is possible. Here, the template is pushed away from the machine by a suitable device on the doctor blade. The elements for mounting and driving the template form the bearing ring or the so-called Rapportrad, with adapter and bearing elements and gear and clamping disk or tensioning wheel, which in turn may have an adapter ring with bearing elements. The cylinder template is inserted into the machine from above together with the ink applicator. ne inserted or removed. An essential feature is that the connection or separation of stencil and inking device takes place outside the machine. The elements for storage and drive of the template are movable, so separable from the machine.

In the machine according to the invention, the receiving housing is pivoted open with the housing segments for this open storage, so that the cylinder template can be easily removed upwards from the U-shaped housing base. This allows a quick and easy setup, especially for wide machines from above. The risk of stencil damage is thereby reduced. It is also possible to quickly exchange prepared replacement units and use them from the top.

A preferred embodiment according to the invention is that at least one receptacle, a drive is provided, the drive pinion meshes with a ring gear, which is rotatably attached to the adjacent bearing ring. There is according to the invention the possibility of a drive of only one side or from both sides. The formation of a closed housing on the drive side is advantageous for a particularly stable construction.

In principle, the housing segments can only enclose the area of the rotary bearing on the bearing ring. It is particularly preferred according to the invention that the housing segments enclose the pivot bearing and the ring gear of the bearing ring. As a result, an almost complete enclosure of the bearing ring is achieved on the drive side. This is advantageous for stability and protects the drive unit / or contamination.

It is provided according to the invention that a clamping device is provided for axial clamping of the cylinder template, wherein the clamping device further spaced at least a first bearing ring relative to the second bearing ring and the lylinderschablone is displaceable from an assembly position into an operating position. The clamping device is hydraulically or pneumatically operated and has corresponding actuating cylinder. For this purpose, at least one receptacle with respect to the frame axia! slidably mounted, wherein a control cylinder generates the desired axial clamping movement between the frame and recording. Alternatively, the clamping device can also be provided in the region of the receptacle and act directly on the bearing ring. To set a repeat, the bearing ring can also be adjusted in three dimensions by means of appropriate adjustment axes and adjusting devices. In the relaxed mounting position, in which the two bearing rings are moved to each other, it is possible to solve the cylinder template with their end rings of the bearing rings. Thus, the bearing rings can remain with the drive units on the machine to secure the repeat. After appropriate mounting of the cylinder template at least one bearing ring is moved relative to the other bearing ring, so that the cylinder template is stretched in its operating position.

In order to achieve a high degree of flexibility in the various setting techniques, it is provided according to the invention that the inking device, which in particular has a doctor blade or a roller blade, is detachably supported on a holding unit, which can pivot in the region of the holder for free access to the interior of the cylinder template is stored. There is thus a free access to the interior of the cylinder template allows, so that the elongated ink applicator can be easily inserted into the interior of the cylinder template. If the inking device has reached its end position, the holding unit can be pivoted back into the operating position and the inking device can be attached thereto.

In particular, in a rotary screen printing machine with a one-sided drive of the cylinder templates, it is advantageous to provide on the side opposite to the drive side, at least one receptacle with upwardly open, approximately U-shaped housing base to softer a one-piece closure bracket is arranged for enclosing the bearing ring. This one-piece closure bracket can in particular be pivoted. Alternatively, however, the closure bracket can be fastened with two bolts.

For easy mounting and dismounting of the cylinder template in the setup technique after the closed storage, it is inventively provided that the fastening device has interlocking locking lugs, which form or solve a firm connection by rotation. In this case, the fastening device is designed so that at most a very small axial displacement of the cylinder template is necessary in order to achieve an attachment between the end ring and the bearing ring. to solve or solve. This Axialweg for closing or releasing a connection of the fastening device is preferably smaller than the axial clamping movement of the clamping device for clamping the cylinder template. In this way, in the relaxed mounting position, the cylinder template can be easily removed by loosening the fastening device.

A particularly reliable storage of the cylinder stencils is inventively achieved in that at least one bearing ring in the receptacle is statically balanced and arranged in the manner of a three-point bearing. Preferably, the two bearing rings of a screen printing template are stored accordingly.

A high flexibility when setting up the rotary screen printing machine according to the invention is further achieved in that the housing segments are locked independently of the clamping device of the cylinder template. For this purpose, corresponding locking elements are provided on the housing segments. These can be operated manually or pneumatically or in any other suitable manner. Independence of the clamping device of the cylinder template ensures that a reliable closed storage is ensured when the clamping device is relaxed and removed according to the setup technique of the closed storage.

It is also according to the invention that the housing segments are pivotable between a closed position and an open position in which actuating arms protrude into the region of the bearing rings. In principle, it is possible to move the housing segments by corresponding pneumatically or hydraulically actuated actuators. According to this embodiment of the invention, however, it is preferred that actuating arms or actuating levers are provided on the housing segments, which optionally pivot into the region of the bearing rings during opening under spring preload. When inserting a cylinder template, these actuating arms are correspondingly pushed away from the region of the bearing rings, so that this results in an automatic closing movement of the housing segments.

The invention will be further described by means of preferred embodiments, which are schematically illustrated in the accompanying drawings, in which: Fig. 1 is a perspective view of a part of a rotary screen printing machine according to the invention;

Fig. 2 is a side view of Fig. 1;

Fig. 3 is a perspective view of Figure 1 with the storage open.

Fig. 4 is a side view of Fig. 3;

Figure 5 is a perspective view of a portion of a rotary screen printing machine according to the invention with partially removed stencil and inking device in geschlossner storage.

Fig. 6 is a side view of Figure 5;

7 shows a perspective view of a rotary screen printing machine according to the invention with a drive-free template side;

8 is a perspective view of an inking device with a doctor blade; and

Fig. 9 is a schematic representation of an inking device with roller blade.

In Figures 1 and 2, a rotary screen printing machine 10 according to the invention is shown with a closed storage. In the case of this machine 10, a cylinder template 20 extends in a known manner transversely to a printing support 18, which may in particular be a conveyor belt on which a substrate to be printed is applied. A frame is omitted in this view for clarity.

The cylinder template 20 is rotatably mounted on both sides with bearing rings 30, 32 in each case in a receiving housing 40 of a first and second receptacle 14, 16. On the receiving housing 40 of the first receptacle 14, a drive 44 is arranged below the cylinder template 20. The latter drives the right-hand first bearing ring 30 and thus the cylinder template 20 via a drive pinion (not shown). The bearing ring 30 is arranged in an approximately U-shaped housing base 41, at whose Top two hinged or pivotable housing segments 42 are arranged. In the illustration of FIG. 1, these housing segments 42 are closed and locked, wherein a total of a closed receiving housing 40 is formed.

On the opposite, non-driven side of the cylinder template 20, the second receptacle 16 also has a U-shaped housing base 16, on whose upper side a closure clip 48 is fastened by means of a latch. This also forms a closed receiving housing 40 on the second receptacle 16.

At the first receptacle 14, a holding unit 60 for holding a paint application device 22 is arranged for free access to the tubular cylinder template 20. The ink application device 22 has a Farbzuführrohr, which extends along a cylinder axis of rotation 21 in the interior of the cylinder template 20. The holding unit 60 has an approximately hook-shaped or U-shaped receptacle for holding the ink application device 22. At its base body, the holding unit 60 is pivotally mounted on the first receptacle 14 via a pivot pin 62.

According to Figures 3 and 4, the rotary screen printing machine 10 according to the invention is shown with open storage. For this purpose, the two housing segments 42 are unlocked at the first receptacle 14 on the U-shaped housing base 41 and pivoted open in its open position. On the second receptacle 16 of the housing base 41 of the one-piece fastener bracket 48 is removed, so that the cylinder template 20 can be removed with its two end rings 24, 25 and the detachably secured thereto bearing rings 30 and 32 upwards. For this purpose, the inking device 22 is released from the holding unit 60 and removed with the cylinder template 20 upwards.

Furthermore, it can be seen that on the first bearing ring 30 on the outside of a sprocket 36 is rotatably disposed, which is in meshing connection with the drive pinion of the drive 44. The housing segments 42 are arranged pivotably on the housing base 41 via a respective hinge pin 43. At the two bearing rings 30, 32 each have a pivot bearing 34 is arranged, which is a radial bearing with rolling elements. For a stable storage, the housing segments 42 on the drive side enclose the bearing ring 30 einschiießiich the pivot bearing 34 and the ring gear 36th Referring to Figures 5 and 6, the rotary screen printing machine 10 of the present invention is shown in a closed-storage setup. The cylinder template 20 with its two lateral end rings 24, 25 is already released from the associated bearing rings 30, 32 and lifted upwards. For this purpose, the rod-shaped ink application device 22 was previously released from the holding unit 60, which has been pivoted about the pivot pin 62 by about 90 ° to the side. This makes it possible to laterally extract the rod-shaped ink application device 22 from the cylinder template 20 and the annular first receptacle 14. By clamping the cylinder template 20 by moving the first and second bearing rings 30, 32 together, the thin-walled cylinder template 20 is relaxed and can be released from the lateral bearing rings 30, 32.

For this purpose, the two fixedly connected to the cylinder template 20 end rings 24, 25 a fastening device, which have an annular collar with locking lugs 27 and recesses 28. The adjacent bearing rings 30, 32 are for this purpose formed with corresponding recesses and detents, so that by a short axial and subsequent twisting a connection or in the reverse manner, a release of the connection can take place.

In this arrangement, the first bearing ring 30 remains with the ring gear 36 in the closed receiving housing 40 of the first receptacle 14. This ensures a repeat is secured.

7 shows the drive-free side of the mounting of the cylinder template 20. This second receptacle 16 has the U-shaped housing base 41, on the upper side of which a one-piece arcuate locking clip 48 is releasably fastened by means of a respective bar 49 in order to form a closed annular housing.

Between the first receptacle 14 and the second receptacle 16, a box-shaped support bridge 70 extends, on whose one flank, which faces away from the cylinder template 20, runs along an attachment groove. In this mounting groove, an additional panel can be attached to widen the support bridge 70. The first and second receptacle 14, 16 and the support bridge 70 are mounted on a frame 12 only partially indicated. FIGS. 8 and 9 schematically show the two essential possibilities of applying color to the inside of the cylinder template 20 by means of an inking device 22.

According to FIG. 8, the inking device 22, which has a paint feed tube 53, which is in connection with a doctor blade 54, is arranged inside the cylinder template 20. In a known manner, supplied ink is applied with the doctor blade 54 on the inside of the perforated thin-walled cylinder template 20. On the immediately opposite side of the print run 18, a counter-pressure roller 56 is arranged.

According to the alternative embodiment according to FIG. 8, a roller blade 55 is provided. As a counter-pressure element 18, a magnetic table 57 is disposed on the opposite side of the printing pad. Both inking devices 22 can be used in the rotary screen printing machine 10 according to the invention.

Claims

1. Rotary screen printing machine with

at least one cylinder template (20),

- An inking device (22) which is arranged in the cylinder template (20),

- A first and second end ring (24, 25), which are each attached to a free end of the cylinder template (20),

- A first and second bearing ring (30, 32) which are each connected via a fastening device with the adjacent end ring (25, 26) and a pivot bearing (34) for supporting the cylinder template (20) on a frame (12) rotatable about a Have cylindrical axis of rotation (21), and

- On the frame (12) arranged receptacles (14, 16) for receiving the bearing rings (30, 32), wherein at least one receptacle (14) has an upwardly open, approximately U-shaped housing base (41) and two movably mounted housing segments (42) for releasably enclosing a received pivot bearing (34), characterized

- That the housing segments (42) annularly enclose the bearing ring (30) and form a closed receiving housing (40) and

- That when the bearing rings (30, 32) in the receptacles (14, 16), the cylinder template (20) with the end rings (24, 25) of the bearing rings (30, 32) is detachable and removable.

2. Rotary screen printing machine according to claim 1, characterized geke n net I net, that at least one receptacle (14) a drive (44) is provided, the drive pinion meshes with a ring gear (36) rotatably attached to the adjacent bearing ring (30) is.

3. Rotary screen printing machine according to claim 2, characterized Porsche Style nze net that the housing segments (42) enclose the pivot bearing (34) and the ring gear (36) of the bearing ring (30).

4. rotary screen printing machine according to one of claims 1 to 3, characterized geke n net I net, that a clamping device for axial clamping of the cylinder template (20) is provided, wherein the clamping device at least a first bearing ring (30) relative to the second bearing ring (32) on spaced and the cylinder template (20) is displaceable from an assembly position into an operating position.

5. Rotary screen printing machine according to one of claims 1 to 4, characterized geke n nze I net, that the inking device (22), which in particular has a doctor blade or a roller blade, on a holding unit (60) is releasably supported, which for free access to Inside the cylinder template (20) in the region of the receptacle (14) is pivotally mounted.

6. Rotary screen printing machine according to one of claims 1 to 5, characterized geke n nze me n et that at least one receptacle (16) has an upwardly open, approximately U-shaped housing base (41) on which a one-piece closure bracket (48) for Enclosing a bearing ring (32) is arranged.

7. Rotary screen printing machine according to one of claims 1 to 6, characterized ge ke n nzei ch n et that the fastening device has interlocking locking lugs, which form or solve a firm connection by rotation.

8. Rotary screen printing machine according to one of claims 1 to 7, characterized geke n nzeich net that at least one bearing ring (30, 32) in the receptacle (14, 16) is statically balanced and arranged in the manner of a three-point bearing.

9. rotary screen printing machine according to one of claims 4 to 8, characterized geke n net I net, that the housing segments (42) independently of the clamping device of the cylinder template (20) are lockable.

10. Rotary screen printing machine according to one of claims 1 to 9, characterized ge ke nnzeichnet that the housing segments (42) are pivotable between a closed position and an open position, in which actuating arms in the region of the bearing rings (30) protrude.