EP1400471A1 - Method for opening bobbins and device for performing the method - Google Patents

Abstract

The method for removing an outer sleeve (12) from a reel (13) of e.g. cigarette paper or foil comprises applying a rotating roller (22) to it, so that it is held taut. It is then weakened using e.g. a cutter (20), laser beam or hot wire so that it tears. An Independent claim is included for a machine for carrying out the method.

Description

The invention relates to a method for opening bobbins, each from at least one wound material web with a plurality one above the other lying layers are formed, each bobbin from a closed outer Wrapping is surrounded. Furthermore, the invention relates to a device for Opening bobbins, the device consisting essentially of an opening unit consists.

Devices of the generic type serve inter alia. in the field of tobacco processing Machines as well as in packaging technology, bobbins for the further Prepare for processing. Each bobbin is usually wrapped provided that completely encloses the bobbin. The wrapping holds the bobbin in front of the Processing together and can be made from a separate protective or cover element consist. Most of the wrapping, however, becomes the top layer of the bobbin wound continuous web of material formed itself, with the free end of the Material web is connected to the adjacent layer by gluing or the like. The bobbins usually have a core come in the area of tobacco processing industry especially for cigarette paper, filter wrapping paper. Base paper but also for separate packaging materials made of different Materials such as Paper, tinfoil, plastic or the like are used.

For the further processing of such bobbins, in particular the splicing of a new one full bobbin to a largely developed bobbin, which is a continuous Operation of the machines guaranteed. it is necessary to open the bobbin. This means that the casing is removed or opened. for at least one free To produce the end of the wound material web.

Devices are already known, the opening units with cutting tools by means of which the covering, which represents the uppermost layer of the bobbin, is completely severed. There is a risk that Cutting tools can also damage underlying layers, causing too leads to increased committee formation. Show other known devices thermal cutting tools. Especially in the bobbin area, which is usually made up of very thin material, this leads to undesirable Damage or discoloration. In other known devices or A separating tool is inserted between the two uppermost layers. For this however, it is necessary to raise the top layer with additional devices or suck. Such devices and methods are very good complex and therefore cost-intensive, on the other hand there is the complete Cut through the top layer with a single cut or when threading the Cutting tool between the top layers, the risk that the below the top layers are damaged.

It is therefore an object of the present invention to be simple and universal propose usable procedure with the bobbin automated and reliable can be prepared for further processing without the below the Wrapping existing layers. Furthermore, it is the job of Invention to provide a device that automated and reliable opening guaranteed by bobbins in a simple and gentle way.

• Spannen der Umhüllung der Bobine, indem eine Zugkraft in Umfangsrichtung der Bobine auf die Umhüllung aufgebracht wird, und
• Schwächen der Umhüllung, bis diese durch die Zugkraft reißt.

The task is solved on the one hand by the method mentioned at the beginning, which is characterized by the following steps:

• Tensioning the wrapping of the bobbin by applying a tensile force in the circumferential direction of the bobbin to the wrapping, and
• Weaken the casing until it tears due to the tensile force.

With the method according to the invention, bobbins can be automated and Prepare reliably for further processing by opening the wrapper without affecting the layers underneath the casing. The claimed process can be used universally. so that bobbins from different Material, different size and regardless of material, temperature or Moisture fluctuations prepared, namely can be opened. With this All variants of bobbins, e.g. Bobbins with and without Bobbin lock, especially when operating in fully automatic bobbin changers to process.

A preferred development of the method provides that the means for Weakening the wrapper and the means to apply traction over one Control loop controlled and / or regulated. This makes it universal use still improved. Furthermore, material-dependent and wear-related Settings are dispensed with, so that the operating effort is significantly reduced is. Thanks to the integrated control process, the process adapts without any intervention by different boundary conditions.

The task is on the other hand with a device of the type mentioned solved in that the opening unit from a means for applying a Traction on the wrapping in the circumferential direction of the bobbin and a means for Wrapping weaknesses exist. This ensures that the bobbin or Opening is opened without affecting the underlying layers. The Weakening agent gradually acts on the wrapping, until it does the tensile force applied is sufficient to tear the weakened material. The middle to weaken the envelope does not separate completely, but creates the weakening is only a predetermined breaking point at which the wrapping through Then the tensile force tears. The one below the wrapper arranged layers are thus safe against any kind of impairment protected.

Advantageously, the means for weakening the casing and the means for Applying the tractive force via a control loop to form a closed one System interconnected. This allows the bobbins to be opened fully automatically take place, whereby via the control loop i.a. the duration and intensity of the weakening of the Wrapping as well as the size of the tensile force. which acts on the wrapping, tax and / or are adjustable. The control loop enables the bobbins to be opened. the insensitive to material, temperature and / or moisture fluctuations is because there is an automatic adaptation to the different conditions. The control loop also adjusts or adjusts the device overall unnecessary, since the device according to the invention the boundary conditions recorded and implemented automatically.

In a preferred development of the device, the means for weakening the Wrapping a knife. The knife is easily over the bobbin non-positively movable back and forth, so that the wrapping gradually on one defined position is destroyed in a controlled manner.

In another advantageous development, the means for weakening the Wrapping a thermal element for heat generation, namely e.g. a Laser unit. Due to the thermal element to weaken the casing weaken even the thinnest materials particularly precisely. Through the contactless and wear-free functioning of the laser unit are those below the casing existing locations protected in a special way. A particularly simple and therefore also preferred embodiment provides a heating wire as a thermal element, the is pressed on the wrapping and thus brings about the weakening.

In a further embodiment, the means for applying the tensile force is one Pressure roller that can be driven in rotation. The pressure roller is particularly suitable To apply tensile force to the casing in the circumferential direction of the bobbin on the one hand is large enough to tear the weakened casing, on the other hand however, it is not sufficient to set the pressure roller in rotation before the wrapping was separated. By means of the pressure roller it can be particularly easily further determine. when the wrapping is torn. because the rotating driven pressure roller as long as the casing is not yet open, and thus the tensile force on the Wraps to tension the wrap. But as soon as the wrapping breaks. rotates the pressure roller. The transition from resting to rotating is particularly easy simply determine within the control loop. so that then the means of weakening the wrapping can be stopped.

Fig. 1

eine schematische Darstellung einer ersten Ausführungsform der Erfindung in Vorderansicht,

Fig. 2

eine schematische Darstellung von Teilen einer zweiten Ausführungsform der Erfindung in Vorderansicht,

Fig. 3a

eine schematische Darstellung von Teilen einer dritten Ausführungsform der Erfindung in Vorderansicht außer Eingriff, und

Fig. 3b

eine schematische Darstellung der Ausführungsform gemäß Figur 3a in Eingriff.

Further preferred embodiments and further developments result from the subclaims and the description of the figures. Particularly preferred embodiments of the device according to the invention and the method are described below with reference to the accompanying drawing. The drawing shows:

Fig. 1

1 shows a schematic illustration of a first embodiment of the invention in front view,

Fig. 2

1 shows a schematic illustration of parts of a second embodiment of the invention in front view,

Fig. 3a

is a schematic representation of parts of a third embodiment of the invention in front view disengaged, and

Fig. 3b

a schematic representation of the embodiment according to Figure 3a engaged.

The devices shown in the figures are used to open bobbins, in particular for opening or separating the casing from a bobbin wound continuous material web, which is glued to its free end. in the The case described is the wrapping from a wound layer of the material web self-educated. However, the invention is also suitable for opening bobbins that have a separate wrapper.

The device 10 according to FIG. 1 essentially consists of a means 11 for Weaknesses of the casing 12 of a bobbin 13 and from a means 14 for Applying a force in the circumferential direction of the bobbin 13. The means 11 is optional connected to the means 14 by a control circuit 15. The control circuit 15 has in addition to a controller 16, a drive 17 for the means 14 and a Detection element, e.g. a sensor 18. There is also a lifting cylinder 19 Part of the control circuit 15, the lifting cylinder 19 for up and down movement of the means 11 and is operatively connected to the means 14. All Elements of the control circuit 15 are by means of current, signal or other lines connected with each other.

In the embodiment shown in Figure 1, the means 11 for weakening the Sheath 12 designed as a circular knife 20. The circular knife 20 is freely rotatable a holding element 21 is arranged. The holding element 21 is in the axial direction Bobine 13 movable, such that the circular knife 20 back and forth over the bobbin 13 is movable. By means of the lifting cylinder 19, the circular knife 21 is transverse to the other Axial direction of the bobbin 13, that is, perpendicularly in the direction of the surface of the bobbin 13 and movable away from it. Alternatively, it is also conceivable that the holding element 21 or the circular knife 20 is designed to move freely in space to the to take various processing positions. But the circular knife 20 too any other knife or blade could also be in a further version be fixed, so that the weakening of the envelope 12 then by a Relative movement of the bobbin 13 relative to the circular knife 20 is achieved. The means 14 could then preferably also be moved together with the bobbin 13 to avoid a relative movement between bobbin 13 and means 14. Instead of the circular knife 20, elements for embossing could also be provided weakened by pressure perpendicular to the surface of the bobbin 13 Produce material reduction and / or perforation.

The means 14 for applying the force to the casing 12 in the circumferential direction of the Bobine 13 is designed as a pressure roller 22 in the exemplary embodiment shown. In However, other designs not shown can also be used as a shoe or plate or the like. It is important that with the means 14 a force component transferred as a tensile force in the circumferential direction of the bobbin 13 to the casing 12 can be. The means 14 is also adjustable in height, so that a Adaptation to different bobbin diameters or the like is possible. The means 14 is preferably spring-loaded in order to make permanent contact with the To ensure bobbin 13 or for wrapping 12.

The pressure roller 22 can be driven in rotation by the drive 17 and lies in the Operating state on the bobbin 13 or the casing 12. By rotating driven pressure roller 22, a tensile force is applied to the casing 12, whose main component by the rotary drive in the circumferential direction Envelope 12 acts. In the embodiment shown, the pressure roller 22 is included driven in a counterclockwise direction. In the event that Pressure roller 22 is arranged on the opposite side of circular knife 20, the pressure roller 22 is driven clockwise.

However, the force is defined in such a way that it is usually not sufficient to achieve the Separate sheath 12 in an undamaged or undamaged condition. Much more the tensile force initially serves to tension the casing 12, in particular in Area between the circular knife 20 and the pressure roller 22. In one not The embodiment shown can also have a plurality of means 14 for applying one Force should be provided. In such a case, preference is given to both sides of the Arranged by means 11 for weakening the cover 12 pressure rollers 22, which then are driven in opposite directions so that the area between the pressure rollers 22nd is excited, especially when the means 11 is a non-contact How it works. The traction is sufficient, however, the weakened To separate or tear envelope 12, before the envelope 12 from Circular knife 20 was completely separated. The force is dependent on the opening materials adjustable, for example by the power supply from Drive 17 is controlled and / or regulated.

By the sensor 18, which in the exemplary embodiment shown as an element for Position detection of the pressure roller 22 is formed, in particular can be determined be whether the pressure roller 22 rotates or stands still. The sensor 18 is in the Area of the drive 17 or the pressure roller 22 arranged. Come as sensor 18 all usual means of position detection in question. The sensor 18 reports on the Control 16 to the means 11 for weakening the envelope 12 that it Can end the weakening process.

The individual components of the control circuit 15 together with the means 11 and the means 14 quasi a closed system, with the reel 13 for further Processing can be prepared automatically. The invention In addition, the device can be used universally, and not only in the area of tobacco processing industry and packaging technology, but in all conceivable cases in which an upper layer of sheet-like or flat Material must be opened without the underlying layers in any way Way to interfere.

Instead of the circular knife 20, thermal separating means can also be provided. In FIG. 2 shows a laser unit 23. The laser unit 23 consists essentially of the laser source 24 and a lens 25 for focusing the laser beam 26. Der Distance between the laser source 24 and the surface of the bobbin 13, namely the Wrapping 12 is adjustable. The position of the lens 25 is also variable. It can other lenses or lens combinations can also be used. The invention nor is it limited to the use of lasers as thermal release agents. Other radiations or arrangements for generating heat are also available suitable.

In a further embodiment of the invention, the means 11 for weakening the Sheath 12 formed as a heating wire 27. The heating wire 27 is in the range Insulation or Autlageplatte 28 arranged. The thickness or the diameter of the The heating wire 27 usually corresponds at most to the material thickness of the sheath 12, However, it is preferably made slightly smaller. The heating wire 27 is over the Support plate 28 at least in the vertical direction to the casing 12, that is to say perpendicularly movable to the axial direction of the bobbin 13. The platen 28 also serves as Stop so that the delivery of the heating wire 27 in the direction of the bobbin 13 through the abutment of the support plate 28 on the casing 12 is limited. The heating power of the for example, heating wire 27 designed as an electrical glow wire is adjustable.

Basically, the embodiments described in FIGS. 2 and 3 are in comparable to the mechanical means for weakening the casing 12 included in the control loop 15. That means. that all of Figure 1 Described embodiments and modifications in the same way for those in the Figures 2 and 3 embodiments shown apply so that to avoid Repetitions with regard to the description of those described in FIG. 1 Embodiments is pointed out. All devices described can as individual devices but also as an (integral) component of machines, for example of handling devices or reel changers become.

The method for opening the bobbin 13, namely for opening or separating the casing 12, runs as follows, for example:
On the surface of the bobbin 13, the means 14, namely the pressure roller 22, bears against the casing 12. The pressure roller 22 is driven in rotation by means of the drive 17. Due to the moment, a tensile force acts on the outermost layer of the bobbin 13, that is to say the covering 12, which has at least one component in the circumferential direction of the web-like material. However, the tensile force is defined by adjusting the power supply to the drive 17 in such a way that the contact pressure roller 22 - as long as the casing 12 is closed - does not rotate, but rather only clamps the surface of the bobbin 13, in particular thus the casing 12, as the uppermost layer. The means 11 adjacent to the pressure roller 22 for weakening the sheathing is also lowered near the force introduction zone onto the surface of the bobbin 13 and moved transversely to the material web, that is to say in the axial direction of the bobbin 13, or pressed with a force in the direction of the bobbin 13. By moving the agent back and forth over the bobbin 13 or casing 12, bearing against it, or pressing it onto the bobbin. this leads to a weakening of the material by scratching, cutting, embossing or the like. At the same time, the tensile force applied acts on the weakened predetermined breaking point. From a certain weakening, which is usually achieved before the covering 12 is completely separated by the means 11, the tensile force tears the covering 12 apart in the region of the predetermined breaking point and thus opens the bobbin 13. At the same moment, that is, immediately when the tension is released the driven pressure roller 22 rotates. This rotation is detected by the sensor 18 and passed on to the controller 16. By means of the controller 16, the means 11 then receives a signal for stopping or for upward movement. The lifting cylinder 19 is actuated automatically and disengages the means 11. When the bobbin 13 is opened, it is prepared for further processing and can, for example, be spliced onto an old unwound bobbin 13 with a free end.

When using thermal release agents, the principle is the same as described above comparable. The bobbin 13 is thermally processed with the heating wire 27, specifically by applying a force F to the platen 28 until a weakening of the Material is reached in which the sheath 12 tears by the tensile force. The fat or the diameter of the heating wire 27 can be chosen smaller than the thickness a layer of the wound material, so that it is ensured that the second and all other layers are not affected by the heating wire 27. When the bobbin 13 is opened by means of the laser unit 23, the laser beam 26 becomes such focused that the envelope 12 is weakened only by scratching it. This weakening through contactless thermal processing in turn leads to that the sheath 12 tears due to the tensile force. By adjusting the distance of the Laser unit 23 on the one hand or adjustment of lens 25 on the other hand can Depth of cut can be determined very precisely. Of course, other common ones are also Separation process can be used to generate a predetermined breaking point. It just comes on the fact that the top layer is weakened in some way so that the Tensile force can tear open the envelope defined.

The weakening usually takes place over the entire width of the bobbin 13. But it is also possible to weaken only individual segments of the envelope 12. By The intensity and duration of the means 11 for weakening the coating can be adjusted 12, it is of course also possible not only to weaken the casing 12 and thus to create a predetermined breaking point, but the covering 12 - if this should be necessary - also to separate completely, so that only an extremely small Circumferential force is required to separate the two free ends pull.

LIST OF REFERENCE NUMBERS

10

contraption

11

Wrapping agent

12

wrapping

13

reel

14

Means for applying traction

15

loop

16

control

17

drive

18

sensor

19

lifting cylinder

20

circular blade

21

holding member

22

capstan

23

laser unit

24

laser source

25

lens

26

laser beam

27

heating wire

28

platen

Claims (19)

Method for opening bobbins (13) which are each formed from at least one wound material web with a plurality of layers lying one above the other, each bobbin (13) being surrounded by a closed outer covering (12), characterized by the following steps: Tensioning the casing (12) of the bobbin (13) by applying a tensile force in the circumferential direction of the bobbin (13) to the casing (12), and Weaken the casing (12) until it tears due to the tensile force. Method according to claim 1, characterized in that the weakening of the covering (12) takes place by means of a material (11) by reducing the material in the area of the force introduction zone of the tensile force in order to form a predetermined breaking point. Method according to claim 1 or 2, characterized in that the tensile force is generated by a means (14) applied to the casing (12). Method according to one of Claims 1 to 3, characterized in that the means (11) for weakening the casing (12) and the means (14) for applying the tensile force are controlled and / or regulated in intensity and duration via a control circuit (15) become. Method according to one of claims 1 to 4, characterized in that a sensor (18) detects the tearing of the casing (12) and stops the means (11) for weakening the casing (12). Method according to one of claims 1 to 5, characterized in that the weakening of the casing (12) takes place mechanically and / or thermally. Device for opening bobbins (13) which are each formed from at least one wound material web with a plurality of layers lying one above the other, each bobbin (13) being surrounded by a closed outer casing (12), essentially consisting of an opening unit, thereby characterized in that the opening unit consists of a means (14) for applying a tensile force to the casing (12) in the circumferential direction of the bobbins (13) and a means (11) for weakening the casing (12). Apparatus according to claim 7, characterized in that the means (11) for weakening the casing (12) and the means (14) for applying the tensile force are connected to one another via a control circuit (15) to form a closed system. Apparatus according to claim 7 or 8, characterized in that the means (11) for weakening the casing (12) is designed as a thermal and / or mechanical element. Device according to one of claims 7 to 9, characterized in that the means (11) for weakening the casing (12) is a knife (20). Device according to one of claims 7 to 9, characterized in that the means (11) for weakening the casing (12) is a laser unit (23). Device according to one of claims 7 to 9, characterized in that the means (11) for weakening the sheath (12) is a heating wire (27). Device according to one of claims 7 to 12, characterized in that the means (14) for applying the tensile force is a pressure roller (22). Apparatus according to claim 13, characterized in that the pressure roller (22) can be driven in rotation. Device according to claim 13 or 14, characterized in that the pressure roller (22) can be moved perpendicular to the axial direction of the bobbins (13). Device according to one of claims 7 to 15, characterized in that the means (11) for weakening the casing (12) can be moved in the axial direction of the bobbins (13) and perpendicularly thereto. Apparatus according to claim 16, characterized in that the means (11) for weakening the casing (12) is connected to a lifting cylinder (19). Device according to one of claims 7 to 17, characterized in that the control circuit (15) has a control (16), a drive (17) and a sensor (18). Apparatus according to claim 18, characterized in that the control (16) is connected to the lifting cylinder (19), to the drive (17) and to the sensor (18).

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