EP0708049B1 - Severing device for paper web - Google Patents

Abstract

The device has the web (10) wound on a first drum (11). It guides the unwinding web onto a second (empty) drum (12), during which the web is split by a tape (20) or similar. Its free end is movable by a transporting device (3) along a guide rail from one side of the web to the other, and able to be fixed to the second drum. A carriage is moved along the guide rail. The carriage has a holding device for the tear tape (20), the free end of which can be fed from one side of the web to the other.

Description

The subject invention relates to a device for cutting a paper web which is wound on a first drum, and to initiate the winding up of this paper web on an empty, second drum, the separation of the paper web by means of a Tape or the like takes place, the free end by means of a conveyor along one below and across the paper web this aligned guide rail from one side of the paper web on the other side is movable and on the empty drum can be fastened, whereupon it is wound helically on this which separates the paper web as well as the empty drum is transferred.

Such a device is from the WO 86/00282 (EP-B-186 659). Here there is a conveyor on one side of the paper web for a tear tape made of paper cords, which from a storage drum is removable. There is a guide rail below the paper web arranged, which is transverse to the paper web from one Side extends to the other side and which one with an up open and undercut channel for receiving the tear tape is trained. The free end of the Tear tape from one side of the paper web to the other side moved there. On the other side of the paper web is a facility provided by means of which the free end of the tear tape for emptying Drum is moved, on which it is by means of an adhesive coating is attached. Because the one provided in the guide rail If the channel is open at the top, the ripcord will be removed from the guide rail pulled up and it will be on the empty one Drum wound helically, creating the paper web is also cut along a helical line and the following paper web is wound on the empty drum.

US-A-4 757 950 discloses an apparatus which the apparatus largely similar to EP-B-186 659 cited above is. This device has a device by means of which the tear tape is shot between the two drums initiate the tearing process. This conveyor is not used the tear tape from one side of the paper web to the other side to move but rather the free end of the through the channel to grasp pushed tear tape and this for the introduction of the separation process between the two paper drums.

However, these known devices have a number of disadvantages on. On the one hand, the tear tape must have the required rigidity have to by means of the first conveyor along the in the Guide rail located channel from one side of the paper web to be pushed to the other side. On the other hand exists due to the fact that the provided in the guide rail Channel must be matched to the width of the paper tape, either the need for different widths of tear tapes To provide guide rails, which increases the manufacturing costs or the requirement, regardless of the technical circumstances, namely the different widths and the different Strengths of the paper webs always use tear tapes of the same width. However, this requires the further requirement, regardless of the Use a tear tape with maximum tensile strength.

Furthermore, in the known devices, the tear tape at Separation process torn out of the undercut channel, which can weaken it. Furthermore, in the channel Remnants of the tear tape remain, resulting in a subsequent separation process the transport of the tear tape through the channel hindered becomes. Accordingly, there is a requirement in the known device that the duct for guiding the tear tape periodically clean to prevent dysfunction due to constipation to be able to exclude.

In addition, reference is made to the fact that paper webs with a Speed of more than 25 meters per second, which is why in a separation process that takes place within a Fraction of a second is performed, must be guaranteed that the tear tape extends from one side of the paper web to the other Side extends, during the separation process from the guideway is torn out.

From JP-A-60 071 445 a device is known by means of which a sheet of sheet metal is wound on a drum, a paper web between the individual layers of the metal sheet is inserted. The metal sheet and the paper web fed to the drum by means of two conveyors. To achieve a promotion of the paper web corresponding to the requirements the one conveyor along a rod in the longitudinal direction of the sheet metal shifted, causing a change in between the metal sheet and the paper web included angle is achieved.

As can be seen from this, this JP reference does not disclose either Device for winding up a paper web, another device, through which a material web during the winding process by means of a tear tape is cut. Accordingly, this reference discloses a prior art, which of the subject of the invention both in terms of the task and in terms of Solution is so different that it is alien to the species.

DE-B-24 54 668 discloses a device for guiding a Thread in a device for processing the thread, e.g. to the Stretching the thread. Thus, neither a paper web is provided, which is wound on a drum, a tear tape is still provided, by which the paper web is divided. Thus revealed this reference also has no relevant prior art.

Based on the prior art explained above, it is therefore the object of the invention, a device to create through which those adhering to the prior art Disadvantages are avoided. This is according to the invention achieved that a slide is guided along the guide rail, which with a holding device for the tear tape or the like. is trained, whereby the free end of it from one side of the paper web whose other side is eligible.

Thus, in a device according to the invention, the technical Requirements optimally matched tear tape can be used and therefore this tear tape does not need any inherent rigidity to have, since it is by means of the slide along the guide rail from one side of the paper web to the other side of the paper web is pulled. As soon as the If the separation process is to begin, the free end of the tear tape is used another conveyor between the two drums.

Preferably, there is a carrier for two clamping jaws on the carriage arranged, one of the clamping jaws being pivotable on the carrier is stored. In particular, the second jaw on the carrier against the action of a return spring pivotable relative to the first jaw.

According to a preferred embodiment, the carriage is inside guided the guide rail, the guide rail is formed with a slot which is one Carrier for the holding device is penetrated. Furthermore is preferably the guide rail below the paper web of surround a housing, in the interior of which the guide rail located. This case is on the one Side facing the empty spool by means of a hinged flap closed.

According to further preferred embodiments, the Slot of the guide rail, which is from the carrier for the holding device is protruded, on a first page the holding device approximates below the rail, being openable to the other side and located the openable flap on the other side of the housing.

The guide rail is preferably fastened to a mounting rail, which extends below the paper web. Continue is preferably the slide along the guide rail or the like by means of a rope. movable. The rope can be in be closed, with a run inside the guide rail and the other strand is guided within the mounting rail is.

According to further preferred features, the holding device formed by two jaws, which as rotatable on the carrier mounted rollers are formed, one of the same is formed with a backstop and further one the same is drivable. One of these two can be used for this Rollers be formed with a bevel gear, which with a Rotary drive can be coupled.

Are preferably in the area of the guide rail, where this is not enclosed by the housing, brackets are provided, which formed with adjustable, in particular elastic flaps are.

Fig. 1

eine Vorrichtung zum Auftrennen einer Papierbahn, in axonometrischer Darstellung,

Fig. 2

den Schnitt nach der Ebene A-A der Fig. 1,

die Fig. 3a und 3b

den Schnitt nach der Ebene B-B der Fig. 1, in zwei unterschiedlichen Betriebslagen,

Fig. 4

das Detail X der Fig. 1, in vergrößerten Maßstab,

Fig. 5

eine Ansicht des Details X in nochmals vergrößerten Maßstab,

Fig. 6

den Schnitt nach der Linie C-C der Fig. 5, in vergrößertem Maßstab,

Fig. 7

den Schnitt nach der Linie D-D der Fig. 5, in vergrößerten Maßstab, und

die Fig. 8a und 8b

ein weiteres Detail im Schnitt und in Seitenansicht.

The object of the invention is explained below with reference to an embodiment shown in the drawing. Show it:

Fig. 1

a device for cutting a paper web, in an axonometric view,

Fig. 2

the section along the plane AA of Fig. 1,

3a and 3b

the section along the plane BB of FIG. 1, in two different operating positions,

Fig. 4

the detail X of FIG. 1, on an enlarged scale,

Fig. 5

a view of the detail X on a further enlarged scale,

Fig. 6

the section along the line CC of FIG. 5, on an enlarged scale,

Fig. 7

the section along the line DD of FIG. 5, on an enlarged scale, and

8a and 8b

another detail in section and in side view.

A device according to the invention is used in a system for Winding up a paper web, which at the end of a paper production system is provided. This device has a support frame 1 for a first drum 11, which abuts a drive drum 13 and on which the Paper production system incoming paper web 10, which over a guide roller 15 is fed, is wound. Furthermore, a pivotable support device 14 for one second drum 12 is provided on which the paper web 10 is then wound up as soon as the first drum 11 the desired Winding diameter has reached. In order for the process of Winding from the first drum 11 onto the second drum To be able to pass 12, the paper web 10 must be separated will.

For this purpose a tear tape 20 is used, the free end of one Device 2, which is on one side of the paper web 10th is by means of a conveyor 3 from this side the paper web 10 is promoted on the other side. As soon as the process of separating the paper web 10 should be initiated, the tear tape 20 by means of a on this adhesive coating on the empty Drum 12 attached, making it helical on this is wound up. The tear tape 20 from the Conveyor 3 torn out to a bracket 59. This also makes the paper web 10 spiral separates. At the same time, the front tear edge of the Brought paper web 10 to the empty drum 12, as a result, the paper web 10 on the second Drum 12 is wound up. Then the first drum 11, which has reached the desired winding diameter, is removed, the second drum 12 arranged, which by contacting the drive drum 13 in Rotation is held, and is in the support 14th another empty drum inserted.

With such a system, the paper production system can accordingly e.g. at a speed of 25m / sec. fed paper web 10 continuously on drums be wound up. Once the first drum 11 the intended Has reached winding diameter, the paper web 10 separated, the winding takes place on the empty, second drum 12 and the full drum is removed.

The tear tape 20 is by means of the device 2 from a storage drum 21 deducted and the conveyor 3, through which the free end of the tear tape 20 from one side of the Paper web 10 is moved to the other side, fed. In device 2 is further on the front free end of the tear tape 20 applied an adhesive that serves to To attach tear tape 20 to the empty drum 12 to the To be able to initiate the separation process. On device 2 is a housing 22 in which is required for the separation process Loops of the tear tape 20 are formed. In addition, Device 2 a braking device and a cutting device for the tear tape 20 included. The device 2 closes Conveyor 3, which will be described below with reference to FIG. 2 is explained.

The conveying device 3 has a support rail 31, on which a guide rail 34 is detachably fastened by means of a U-shaped bar 32 projecting downwards by means of bolts 33. The guide rail 34 is formed with a cylindrical channel 35, within which a cylindrical slide 36 is guided. Two pins 37 protrude laterally from the carriage 36, which protrude through a slot 38 in the guide rail 34 and to which a carrier 40 for two clamping jaws 41 and 42 is fastened. The upper jaw 41 is rigidly connected to the carrier 40. In contrast, the lower jaw 42 is pivotally mounted on the carrier 40 about a pin 43 against the action of a return spring 44. In the direction of movement of the tear tape 20 in front of the two jaws 41 and 42 there is a bracket 45 within which the tear tape 20 is guided and which can be pivoted upward about the bolt 43 against the action of a spring 46. The carriage 36 can be moved in the channel 35 of the guide rail 34 by means of a self-contained pull cable 30. One strand of the pull cable 30 is guided in the channel 35 of the guide rail 34 and the other strand is guided in a hose 30a arranged in the support rail 31 in the manner of a Powden cable. The two clamping jaws 41 and 42 are formed by rotatable rollers. One of the two rollers, in particular the upper roller 41, is designed with a backstop. In addition, the upper roller 41 is coupled to be entrained by means of a shaft with a bevel gear 48.
A housing 49 is fastened to the mounting rail 31, which encloses the guide rail 34 and the carrier 40 and which is closed on the side facing the drums 11 and 12 by means of a flap 50 made of an elastically deformable material.

In the starting position, the carriage 34 and so that the carrier 40 with the jaws 41 and 42 on that Side of the device on which the device 2 is located. In this area, which is shown in FIGS. 3a and 3b is a control cylinder assigned to the carrier 40 23 provided by the piston 24, the lower roller 42nd can be pivoted downward against the action of the spring 44 is. In the pivoted position of this roller 42 can between the two rollers 41 and 42 serving as clamping jaws Tear tape 20 are conveyed through, its free End, which is provided with an adhesive coating, is outside the two jaws 41 and 42, whereby the adhesive layer is not damaged.

As can be seen from Figure 4, the guide rail 34 on the other side of the paper web 10 with a spatial Formed curvature, being in a support device 52, which is provided on a frame 51, ends. By means of this support device 52 that is between the two clamping jaws 41 and 42 gripped tear tape 20 held so that its free end 20a towards the empty drum 12 is aligned. Since the housing 49 in the area of the left The edge of the paper web 10 ends and the tear tape 20 in the area the curvature of the guide rail 34 requires a guide, several brackets 55 are provided for this purpose, which the tear tape 20 enclose. The support device 52 is also a Drive 57 assigned, which via a flexible shaft 58 a drive wheel 56 is guided, which with the bevel gear 48th can be coupled.

5 shows the course of the guide rail 34 and the tear tape 20 in the direction of the axes of the drums 12 and 13. As can be seen from this, the guide rail 34 runs in a curve upwards and subsequently in a curve outside the drive drum 13. The tear tape 20, which is conveyed along the guide rail 34 by means of the carriage 36, follows this course, being within the Bracket 55 is guided. A deflection roller 60 for the conveyor cable 30 is also mounted on the support device 52.
As can be seen from FIG. 6, the brackets 55, which are fastened to the guideway 34, are designed with two elastically deformable flaps 55a and 55b.
7, the bevel gear 48 comes into engagement with the drive gear 56 at the end of the guide rail 34. All of these details are also shown in FIGS. 8a and 8b.

The operation of this device is as follows:
By means of the device 2, a tear tape 20 is pulled off the supply reel 21, the front free end 20a of which is coated in the device 2 on the top with adhesive. The front free end 20a of the tear tape 20 is then passed between the two clamping jaws 41 and 42, which are in the first end position of the slide 36 or the carrier 40, which is shown in FIG. 3b, in the open position. As a result, the two clamping jaws 41 and 42 are brought into their closed position by means of the actuating cylinder 23, as a result of which the tear tape 20 is gripped behind the adhesive layer 20a, and the carriage 36 is moved by means of the cable 30 from one side of the paper web 10 to the other side promoted, the tear tape 20 is pulled. The tear tape 20 is in a slightly tensioned state within the housing 49. The slide 36 is moved further to the support device 52 and pulls the tear tape 20 with it. At this point, the free end 20a of the tear tape 20 is aligned with the empty spool 12, the adhesive layer being on the top thereof.

As soon as the paper web 10 is to be separated, the empty drum 12 by means of an associated drive brought to the rotational speed of the first drum 11. The support device 14 then turns clockwise pivoted, whereby the drum 12 on the drive drum 13th comes to rest and is kept in rotation by it. As soon as the free end 20a of the tear tape 20 by means of of the drive 57 and via the bevel gear 48 onto the drum 12 is moved there, it remains with the coating Adhesive adhere to this and it is pulled by this. As a result, the tear tape 20 from the two jaws 41 and 42 ripped out, the bracket 45 counter the effect of the spring 46 is pivoted up and that Tear tape 20 releases. In addition, the tear tape 20 is also from the Brackets 55, the elastic flaps 55a and 55b of which open, as well as from the housing 49, the elastic flap 50 also opens, torn out to the bracket 59 and it is wound helically on the drum 12. Here the loops previously formed are used up. Finally, the tear tape 20 is cut off. The movement of the tear tape 20 is through the elastic flaps 55a and 55b the bracket 55, through the elastic flap 50 of the Housing 49 and by the band brake located in device 2 slowed down. This makes jerky movements of the Tear tape 20 avoided.

With the helical winding of the tear tape 20 on the drum 12, the paper web 10 is also cut helically and the front tear edge of the drum 12 to Bring plant, whereby the further paper web 10 on the Drum 12 is wound up. Then the full drum 11 removed, the empty drum 12 is arranged in its place, the support device 14 is pivoted back and an empty drum is inserted into this. In addition, the Carriage 36 returned to its original position and the front end of the following tear tape 20 after it has been coated with adhesive by means of the conveyor again moved to the other side of the paper web 10. Thus the device is for a new one Tear process and the start of the wrapping process on an empty one Coil prepared.

Since all types of Tear elements from one side of the paper web on its side other side are movable, the tear tapes on the Width of the paper web or matched to the strength of the paper will. Only the one based on the paper web is decisive required tensile strength of the tear element. Instead of Ropes can also be used for tear tapes.

Claims (13)

1. A device for severing a paper web, which is wound onto a first drum (11), and for initiating winding of the paper web on a second, empty drum (12), severing of the paper web (10) being effected by means of a tear strip (20) or the like, the free end (20a) of which may be moved by means of a conveying apparatus from one side of the paper web to the other along a guide rail (34) located beneath the paper web and oriented perpendicularly thereto and may be attached to the second drum, whereupon it is wound helically thereon, whereby the paper web is severed and transferred to the second, empty drum, characterised in that a carriage (36) is guided along the guide rail (34), which is constructed with a holding device (41, 42) for the tear strip (20), whereby the free end (20a) of the latter may be conveyed from one side of the paper web (10) to the other side.
2. A device according to claim 1, characterised in that a support (40) for two clamping jaws (41, 42) of the holding device is arranged on the carriage (36), one of the clamping jaws (42) being arranged swivellably on the support (40).
3. A device according to claim 2, characterised in that the second clamping jaw (42) may be swivelled on the support (40) with respect to the first clamping jaw (41) and against the action of a restoring spring (46).
4. A device according to any one of claims 1 to 3, characterised in that the carriage (36) is guided within the guide rail (34), the guide rail (34) being constructed with a slit (37) through which there passes a support for the holding device (41, 42).
5. A device according to any one of claims 2 to 4, characterised in that the guide rail (34) is surrounded beneath the paper web (10) by a housing (49), in the inside of which there is located the support (40) for the holding device (41, 42).
6. A device according to claim 5, characterised in that the housing (49) is closed on the side which faces the empty spool (12) by means of a flap (50) which may be swivelled away.
7. A device according to any one of claims 4 to 6, characterised in that the slit (37) in the guide rail (34), through which there projects the support (40) for the holding device (41, 42), is located on a first side, in that the holding device (41, 42) is located approximately below the guide rail (34) and is openable towards the other side, and in that the openable flap (50) is located on the other side of the housing (49).
8. A device according to any one of claims 1 to 7, characterised in that the guide rail (34) is attached to a base rail (31), which extends below the paper web (10).
9. A device according to any one of claims 1 to 8, characterised in that the carriage (36) may be moved along the guide rail (34) by means of a cable (30) or the like.
10. A device according to any one of claims 1 to 9, characterised in that the cable (30) is endless, one strand passing inside the guide rail (34) and the other strand passing inside the base rail (31).
11. A device according to any one of claims 2 to 10, characterised in that the holding device is formed of two clamping jaws, which are constructed as rollers (41, 42) mounted rotatably on the support (40), one of said rollers (41, 42) being provided with a reverse stop and one thereof being drivable.
12. A device according to claim 11, characterised in that one of the two rollers (41) is provided with a bevel wheel (48) which may be coupled with a rotary actuator (56).
13. A device according to any one of claims 5 to 12, characterised in that clips (55) are provided in the area of the guide rail (34), where the latter is not surrounded by the housing (49), which clips (55) are provided with adjustable, especially resilient flaps (55a, 55b).

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