ABROLLSTATION

Description

[0001] The invention relates to a device for unwinding a material web, in particular a paper or cardboard web, from a winding roll for a subsequent machine unit for processing the material web, the axle journals of which are mounted in axle journal bearings with a rotatable outer ring, with a primary unwinding device, a secondary unwinding device, a transport device running between the primary and secondary unwinding devices, and a gluing and separating device, wherein the primary, the secondary unwinding device and the transport device for moving the winding roll from the primary to the secondary unwinding device each have two running surfaces running parallel to one another and coming into contact with corresponding counter surfaces of the outer rings of the axle journal bearings,the axial position of the running surfaces of the primary and secondary rolling devices is adjustable and the running surfaces of the primary and secondary rolling devices as well as the corresponding counter surfaces of the outer rings have a shape that axially guides the respective outer ring.

[0002] Unwinding stations of the type discussed here are well known. They are used for the continuous unwinding of a material web from a winding reel and are installed upstream of a machine for processing the material web, such as a coating machine or a calender.

[0003] A known unwinding station comprises a primary and a secondary unwinding device, which serve to guide a winding roll. A full winding roll is initially guided by the primary unwinding device during the unwinding of the material web. Once the winding roll reaches a desired diameter, it is transferred from the primary to the secondary unwinding device.

[0004] A new, full winding roll is then fed to the primary unwinding device, and the material web wound on it is joined to the material web running off the winding roll guided by the secondary unwinding device before the latter is completely unwound. For this purpose, a gluing device is provided, which often has a gluing roller that can be pivoted about an axis. This roller guides the material web running off the secondary unwinding device to the downstream material web processing machine - viewed in the direction of travel of the material web. To join the two material webs together, the gluing roller is pivoted and pressed against the winding roll guided by the primary unwinding device. At the same time, the material web running off the secondary unwinding device is severed by a cutting device.

[0005] In another device for unwinding a material web, known from EP 1 798 172, the material web is cut lengthwise by one or more cutting devices after unwinding and divided into individual webs, which are then wound onto winding cores to form so-called shipping rolls.

[0006] For this purpose, backup roll or carrier roll winding machines are used, for example. Carrier roll winding machines have two driven carrier rolls on which the winding rolls rest next to each other with their cores aligned during winding. The carrier roll winding machines have a roll ejection device that ejects a set of finished wound rolls from the roller bed formed by the two carrier rolls during a roll change. The finished set of wound rolls is then pushed by the ejection device over the top of a carrier roll onto a lowering platform.

[0007] For transport from the primary to the secondary unwinding station, for example, swivel arms that can be pivoted around an axis are used. These arms engage both sides of the winding roll and transfer it to the secondary unwinding device by means of a swivel movement.

[0008] Alternatively, it is also possible to move the axle journals of the winding roll on several rails arranged one behind the other of the primary and secondary unwinding devices and the transport device.

[0009] Since the winding rolls can differ from each other, albeit slightly, with regard to the axial position of the wound material web, the primary and secondary unwinding devices as well as the transport device with their rails are axially adjustable, which is relatively complex.

[0010] The object of the invention is therefore to reduce the effort required for unwinding the material web.

[0011] According to the invention, the problem was solved by the characterizing part of claim 1.

[0012] The elimination of the axial adjustability of the transport device simplifies the design considerably.

[0013] Experience has shown that the axial position of the outer rings of the axle journal bearings of two winding rolls, which are designed as cylindrical sleeves, can deviate from each other by up to 75 mm or more.

[0014] As before, the exact, axially adjusted continuation of the unwound material web is ensured by the axial adjustability of the position of the bearings of the primary and secondary unwinding devices.

[0015] The transport of the winding roll is simplified if the running surfaces of the primary and secondary unwinding devices and the transport device are horizontal or slightly inclined in the transport direction.

[0016] The horizontal movement of the winding roll on the running surfaces is usually supported by linear slides.

[0017] For easy feeding from the primary unwinding station to the transport device and from there to the secondary unwinding station, it is advantageous if the outer rings of the axle journal bearings of the winding roll in the primary and secondary unwinding devices are each guided on two parallel guide rails. They have a complementary circumferential groove into which the corresponding guide rail of the primary and secondary unwinding devices protrudes.

[0018] To ensure the clearance with respect to the axial position of the axle journal bearings of the winding roll within the transport device, it can be advantageous if the running surfaces of the transport device are also designed as running rails that project into the circumferential groove of the corresponding outer ring, whereby the running rails of the transport device, however, have a significantly smaller width than the running rails of the primary and / or secondary unwinding device.

[0019] Alternatively, it is also advantageous if the outer rings of the journal bearings each have a circumferential ring that projects into a complementary groove of the corresponding running surface of the primary and / or secondary rolling device.

[0020] In this case, for the axial clearance in the area of ​​the transport device, the circumferential ring of the outer rings of the axle journal bearings should each protrude into a groove of the corresponding running surface of the transport device, which, however, has a significantly greater width than the grooves of the corresponding running surface of the primary and / or secondary rolling device.

[0021] Deviating from this, guidance of the axle journal bearings in the area of ​​the transport device can be achieved equally advantageously, regardless of the axial position of the winding roll, if the counter surfaces of the outer rings of the axle journal bearings for the running surfaces of the transport device differ from those for the corresponding running surfaces of the primary and / or secondary unwinding device.

[0022] To simplify the design, it is usually advantageous if the running surfaces of the transport device are located below the running surfaces of the primary and / or secondary unwinding device.

[0023] A wide running surface of the transport device additionally ensures the rolling of the outer rings of the axle journal bearings regardless of their possible axial position.

[0024] The invention will be explained in more detail below using several exemplary embodiments. The accompanying drawings show: Figures 1 to 5: each show schematic side views of a device for unwinding a winding roll 2, 3 of a material web 1 in various stages of the unwinding process; Figure 6: one side of the unwinding device with the outer ring 10 of the axle journal bearing 18 of the winding roll 2, 3 to be guided; and Figures 7 to 10: various possibilities for axially guiding the outer rings 10 in the primary unwinding device 5 and the secondary unwinding device 6.

[0025] In a device with two unwinding devices 5,6 for unwinding winding rolls 2,3, during the unwinding process according to Figure 1 A material web 1 is unwound from the full winding roll 2 in the primary unwinding device 5 by a first drive.

[0026] Simultaneously with the still full winding roll 2 (full reel, "mother roll"), the winding roll 3, which is essentially already unwound, is unwound in the secondary unwinding device 6 by a second drive to the end of a material web 1.

[0027] The power of the second drive is dimensioned such that its drive motor is just sufficient to generate a small torque to enable the remaining unwinding of the material web 1 from the winding roll 3 in the secondary unwinding device 6.

[0028] In contrast to the second drive, the first drive is dimensioned such that its torque is sufficient to unwind the material web 1 even from the still full winding roll 2, which can have a diameter of, for example, 3500 mm and more.

[0029] The drives can be stationary or movable. The unwound

[0030] Material web 1 can be deflected via one or more deflection rollers 9 to stabilize the web run.

[0031] The two axle journals 17 of the winding roll 2, 3, 4 each have an axle journal bearing 18 with an outer ring 10 rotatable around the axle journal 17, in particular in the form of a rolling bearing.

[0032] In another, in Figure 2In the step shown, shortly before the material web 1 is unwound from the winding roll 3, the latter is separated by a bonding and separating device 7 in order to connect one end of the material web 1 with a beginning of the material web 1 of the full winding roll 2. As a result, the winding roll 3 is now ready to be wound, as shown in Figure 3 to be lifted out of the secondary unwinding device 6.

[0033] Then the winding roll 2 is Figure 4 into the secondary unwinding device 6. This winding roll 2 is then completely unwound in the secondary unwinding device 6 in which the winding roll 3 was originally located.

[0034] Meanwhile, Figure 5 A new winding roll 4 is placed into the primary unwinding device 5, in which the winding roll 2 had previously been located. Subsequently, the same unwinding processes take place as previously described.

[0035] The web tension is controlled throughout the entire process, which counteracts winding errors.

[0036] In addition to the familiar unwinding process described above, additional unwinding processes can of course be implemented with the device. Such an additional unwinding process is required, for example, when the system needs to be restarted after a lengthy maintenance shutdown.

[0037] After the unwinding device, the material web 1 is divided into several individual webs of adjustable width by means of a known cutting section (not shown). These individual webs are then wound onto the core set located in a winding bed to form shipping rolls.

[0038] During the unwinding of the material web 1, the winding roll 2, 3 is axially fixed in a fixed bearing of the primary 5 or secondary unwinding device 6. This prevents axial displacement of the material web 1 during unwinding and thus also during the cutting of the web and the rewinding of the partial webs.

[0039] This storage is achieved according to Figures 6 and 8 in that the outer rings 10 of the journal bearings 18 of the winding roll 2, 3 in the primary 5 and secondary unwinding devices 6 are each guided on two parallel and horizontally extending running surfaces 12 in the form of guide rails. For the axial guidance of the winding roll 2, 3, the outer rings 10 of the journal bearings 18 of the winding roll 2, 3 each have a circumferential groove 13 complementary to the guide rails, into which the corresponding guide rail of the primary 5 or secondary unwinding device 6 engages.

[0040] In order to prevent movement of the axle journals 17 along the guide rail, particularly during unwinding, the axle journals 17 or their axle journal bearings 18 are each mounted in a receiving fork or similar.

[0041] Since the position and width of the wound material web 1 can differ slightly from winding roll 2, 3 to winding roll 2, 3, the axial position of the bearing, in particular of each guide rail of both unwinding devices 5, 6, can be axially adjusted separately to adapt to the conditions of the respective winding roll 2, 3.

[0042] The primary unwinding device 5 and the secondary unwinding device 6 are connected to one another via a transport device 8, wherein the transport device 8 for the outer rings 10 of the axle journal bearings 18 of the winding roll 2, 3 has two running surfaces 11 running parallel to one another and horizontally between the primary 5 and the secondary unwinding device 6.

[0043] Thus, the outer rings 10 of the axle journal bearings 18 can slide or preferably roll on the guide rails 12 within the unwinding devices 5, 6 and on the running surfaces 11 within the transport device 8, which significantly simplifies the transfer of the winding roll 2 from the primary unwinding device 5 to the secondary unwinding device 6.

[0044] To simplify the construction, the transport device 8 stands firmly on a foundation.

[0045] In order to enable the transport of the winding roll 2,3 over the transport device 8 independently of the axial position of the guide rails of the unwinding devices 5,6, the running surfaces 11 of the transport device 8 are considerably wider than the guide rails of the unwinding devices 5,6.

[0046] This means that the mating surfaces of an outer ring 10 that come into contact with the running surface 11 of the transport device 8 and with the running rail of the primary 5 and the secondary rolling device 6 differ from one another.

[0047] This means that both adjacent areas of the outer rings 10 located next to the circumferential groove 13 act as contact or counter surfaces for the running surface 11 of the transport device 8 and the running surface 11 is arranged below the upper side of the guide rail.

[0048] The running surfaces 11 of the transport device 8 should be wide enough so that the contact or counter surface 14 of the outer rings 10 is sufficiently large for secure support of the winding roll 2,3, regardless of the axial position of the running rails of the unwinding devices 5,6.

[0049] In contrast, Figure 7a design in which the running surfaces 11 of the transport device 8 are also formed by guide rails that protrude into the circumferential groove 13 of the outer rings 10. However, the guide rails of the transport device 8 are considerably narrower than those of the unwinding devices 5, 6, so that the guide rails of the transport devices 8 have a sufficiently large axial play within the circumferential groove 13 for the axial adjustment of the winding roll 2, 3.

[0050] In contrast to the previously described embodiments, the outer rings 10 in the Figures 9 and 10 a circumferential ring 14 each, which projects into a corresponding complementary groove 15 of the running surfaces 12 of the rolling devices 5,6 and thus ensures the necessary axial guidance.

[0051] At Figure 9The running surface 11 of the transport device 8 also has a groove 16 into which the circumferential ring 14 of the respective outer ring 10 projects. However, the groove 16 of the transport device 8 is considerably wider than the groove 15 of the rolling devices 5, 6, which ensures the necessary axial freedom in the area of ​​the transport device 8.

[0052] In addition, Figure 10 a possible further training of Figure 9 , wherein the running surface 11 of the transport device 8 has no axial limitation similar to that in Figure 8 shown example.

Claims

1. Device for unwinding a material web (1), in particular a paper or card web, comprising a winding roll (2, 3) for a downstream machine unit for processing the material web (1), the axle journals (17) thereof being mounted in axle journal bearings (18) with a rotatable outer ring (10), having a primary unwinding device (5), a secondary unwinding device (6), a transport apparatus (8) running between the primary unwinding device (5) and the secondary unwinding device (6) and a gluing and separating device (7), and wherein the transport apparatus (8) is stationary, characterized in that the primary unwinding device (5), the secondary unwinding device (6) and the transport apparatus (8) have two running surfaces (11, 12) each running in parallel with each other and coming into contact with corresponding counter surfaces of the outer rings (10) of the axle journal bearings (18) for moving the winding roll (2, 3) from the primary unwinding device (5) to the secondary unwinding device (6), the axial location of the running surfaces (12) of the primary unwinding device (5) and the secondary unwinding device (6) being adjustable and the running surfaces (12) of the primary unwinding device (5) and the secondary unwinding device (6) and the corresponding counter surfaces of the outer rings (10) having a shape guiding the respective outer ring (10) axially, and the running surfaces (11) of the transport apparatus (8) provide at least an axial clearance corresponding to the extent of the axial adjustment of the running surfaces (12) of the primary unwinding device (5) and the secondary unwinding device (6).

2. Device according to Claim 1, characterized in that the running surfaces (11, 12) of the primary unwinding device (5), the secondary unwinding device (6) and the transport apparatus (8) run at least substantially horizontally.

3. Device according to Claim 1 or 2, characterized in that the running surfaces (12) of the primary unwinding device (5) and the secondary unwinding device (6) are configured as running rails which protrude into a complementary circumferential groove (13) of the corresponding outer ring (10).

4. Device according to Claim 3, characterized in that the running surfaces (11) of the transport apparatus (8) are configured as running rails which protrude into the circumferential groove (13) of the corresponding outer ring (10), wherein the running rails of the transport apparatus (8) have a substantially smaller width than the running rails of the primary unwinding device (5) and / or the secondary unwinding device (6).

5. Device according to Claim 1 or 2, characterized in that the outer rings (10) in each case have a circumferential ring (14) which protrudes into a complementary groove (15) of the corresponding running surface (12) of the primary unwinding device (5) and the secondary unwinding device (6).

6. Device according to Claim 5, characterized in that the circumferential ring (14) of the outer rings (10) in each case protrudes into a groove (16) of the corresponding running surface (11) of the transport apparatus (8), wherein these grooves (16) have a substantially greater width than the grooves (15) of the corresponding running surface (12) of the primary unwinding device (5) and the secondary unwinding device (6).

7. Device according to Claim 1 or 2, characterized in that the counter surfaces of the outer rings (10) for the running surfaces (11) of the transport apparatus (8) differ from those for the corresponding running surfaces (12) of the primary unwinding device (5) and the secondary unwinding device (6).

8. Device according to Claim 7, characterized in that the running surfaces (11) of the transport apparatus (8) are located below the running surfaces (12) of the primary unwinding device (5) and the secondary unwinding device (6).