DE8527026U1 - Moving device - Google Patents

Description

Machine factory GOEBEL GmbH
Goebelstrasse 21, 6100 Darmstadt 1

Moving device

The present invention relates to a device for changing the position of knives, in particular of bottom knives for looped cut when cutting paper, foil, fabric or the like Web-shaped material with ring-shaped undercutters or holders pushed onto at least one shaft for this bottom knife.

When longitudinally cutting paper, fabric, foil, metals or the like, a distinction is made between the so-called straight cut from the so-called looped cut. With the straight cut, the one to be cut into individual strips runs Path approximately tangential between at least one upper knife and at least one lower knife through, so that on

<15 this way from one web at least two strips develop. Not only one pair of knives but also several pairs of knives can be worked together, in order to cut a relatively wide web into a large number of relatively narrow webs. 20th

The end processor of the web to be cut often requires webs of different widths, which is why the requirement arises, a relatively wide web during a production process, for example in relatively wide and during another '' ■ production process into relatively narrow lanes

^ cut. These cut webs are in the Usually 2u rolls wound around with it for example

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in an easy and convenient way to the respective end processor to be able to be covered over these tracks

The changing wishes of the end processor mean for those who want a relatively wide web to subdivide into individual lanes that the facility available to him has to be converted accordingly must become. This process is usually referred to as "positioning".

With the so-called straight cut, it is relatively easy to position the lower and upper knife, as the web does not counteract one of the two knives presses and hinders its mobility. In the so-called looped cut, on the other hand, it is much more difficult to move the knife wrapped by the web, because the web due to the For the purposes of processing, the tension that necessarily prevails in it presses against the lower knife. That This restricts the mobility of the lower blade, which is why it is particularly necessary in this case is to ensure a smooth movement of the lower blade when the position this bottom knife is to be changed.

From DE-AS 18 02 305 a device is previously known, pressed in the compressed air between the mutually displaceable parts of the slide guide of a knife will. However, this previously known device requires a heavy, complex slide, which also has a requires even more complex individual drive for each lower knife.

The device according to EP-A 96 026 (WO 83/02083)

• I · ·

the goal is to expand a hub with. This goal is not sought by the ^one proposed invention. An expansion of knife hubs is not up for discussion in the proposed invention. This also applies to French patent application 23 40 170.

Starting from the problem outlined, the task is to set up a device that is as simple and smooth as possible for moving the knives or their holders, in particular those knives or holders to propose for the so-called bottom knife, especially in the event that the bottom knife is at least partially is wrapped around by the web to be cut.

This object is achieved in that per holder i

a lower knife or per undercutter in the lower blade or supports supporting shaft is incorporated at least one radial bore, the exit points of this radial hole or these radial bores ches of the shaft are arranged within that axial Berei- \ that even at slight in the longitudinal direction of the shaft displacement the holder or the lower blade is constantly covered by this holder or the lower blade, the exit points of the bores are positioned in the upper half of the shaft when the shaft is at a standstill, a |

this positioning with the shaft in |

Positioning device which can be brought into engagement and a feed | line for introducing pressure medium into the radial Holes are provided.

The present invention makes it possible to move the bottom cutter in the radial direction with respect to it

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To move the supporting shaft within the play caused by the manufacture so far that it can be moved easily in the axial direction of the shaft. This makes it possible to move even relatively heavy lower knives, in particular so-called cutting sleeves, smoothly from one position to another. This allows, in turn, the entire facility in question in a simple and fast way from a type of production to another _switch} ie for example of a width of slitting strip to another.

On the basis of an exemplary embodiment which is shown schematically in the attached figures and does not limit the basic idea the proposed device is explained in more detail. In the figures are in the present The context of non-essential machine parts for a clearer representation due to the fact that they are not

20 nerisch shown, rather only ι those parts are shown in the figures, which for a more detailed explanation

of the basic idea are required.

The individual figures mean:

Figure 1): Basic sketch of the so-called straight section

Figure 2): Principle sketch of the so-called. Looped cut Figure 3): partial section through a lower knife

supportive wave

Figure 4): Positioning device for the shaft supporting the lower blade

Figure 5): Top view of the device according to Figure 4

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In the device according to Figure i, one runs into several

l | Strip 1 to be cut, web 2 to be cut through a knife

f couple through. Each pair of knives includes an outer knife

and at least one lower knife 4. The upper knife (s)

^ 5 ser 3 is / are attached to shaft 5, while the or the lower blades 4 are mounted on a shaft β.

μ Each of the shafts 5 or 6 can be rotated in a corresponding

% ühend trained machine frame stored and can

γ also be driven. For the purpose of

, 8 10 change of position, d. H. the width of to be cut Strips 1 can the upper knife 3 along the

Shaft 5 - that is, in the direction of view of FIG. 1 - and the Un-'S termesser 4 can be shifted along the shaft 6 as required. This shift can be relatively slight _3, in particular if several cutting points are provided for each lower knife. For example, undercutters can be designed in the form of so-called cutting sleeves, each cutting sleeve containing a plurality of cutting edges. With each of these edges, one and the same upper knife can work together, so that it is often necessary in so-called format changes to move the upper knife by a relatively wide axial extent, but the lower knife only by a much shorter, in order to make this possible that the upper knife with

another cutting edge, a so-called cutting groove than before can work together.

From FIG. 2 it can be seen that the web 2 and the strips 1 cut from it are the undercutters 4 partially wrapped around it. In this way, the web to be cut during the cutting process held better than in the case of the so-called straight cut according to FIG.

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entwined cut according to Figure 2 have to be shifted in the axial direction of the shaft 6, then press the web 2 to be cut and the strips 1 cut therefrom due to the mechanical tension residing in it, the lower knife or knives 4, their weight especially when it comes to So-called cutting bushes are, should not be neglected , against the shaft 6 supporting the lower blade or blades and thus prevent the lower blade 4 from being displaced in the axial direction of the shaft S ₃ , i.e. in the direction of view of FIG.

From FIG. 3 it can be seen that on each shaft 6 a plurality of undercutters 4a, 4b, 4c etc. can be arranged next to one another. In addition, at least one axial bore 7 is machined into the shaft 6. At one end of the bore 7 there is a ball valve 8, the other end is closed by a screw 9. Radial bores 10, 11 and 12 open into bore 7, the radially outer ends of which represent exit points from which the compressed air blown in via ball valve 8 can exit. These exit points are denoted by 13, 14 and 15. The exit points 13 , 14 and 15 are arranged in Figure 3 approximately in the middle of the respective lower cutter, so that even if the respective associated lower cutter should be shifted in the axial direction of the shaft 6 within certain limits, the respective exit point from the respective Uritermesiäer is constantly covered. In other words, this means that the respective lower cutter can only be lifted as far as possible with respect to the shaft 6, so that this undercutter can only just barely cover the respective outlet.

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The radial bores 10, 11 and 12 are machined into the shaft 6 so that they are at a standstill Shaft come to rest in the upper half 16 of this shaft when the shaft is shown in section. In order to facilitate this, a positioning device is provided which enables the shaft 6 to be positioned directly before the respective positioning of the lower cutter 4 in an easily possible way to stop so that the holes 10, 11 and 12 come to rest in the upper half 16.

The positioning device consists, for example, of a pawl 17 which is inserted into a corresponding recess or groove 18 of the shaft 6 can engage. For example, the pawl 17 with the aid of a compression spring 19 in the hole 18 are locked. With the help of a cam 20 it is made possible to the pawl 17 from the Disengage hole or recess 18. It is possible j the cam 20 on a shaft 21 together with to mount this rotatably and to rotate the shaft 21 with the aid of a hand lever 22. A switch 23 prevents the start-up of the machine in that case. * | in which the pawl 17 blocks the rotation of the shaft 6. ί

The bore 18 is preferably made at one end of the shaft 6 so that most of the shaft remains free to position the lower knife on it.

In addition to this mechanical possibility of positioning,. tion of the shaft 6, it is conceivable that this shaft with a | To equip so-called. Rotary encoder and in this way the shaft 6 in an electrical or electronic manner

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: to stop together with a brake that can be switched on and off acting on the shaft 6 in such a way that the exit points 13, 14 and 15 of the holes 10, 11 and

I 12 essentially point upwards, i.e. in the upper one 5 half of the shaft 6 are arranged. In this way

is it possible, by introducing a pressure medium,

such as compressed air, the lower blades by

i marginal amounts compared to shaft 6 upwards

j to lift and a cushion of pressure medium, for example

I get 10 ways of compressed air on which the respective

\ Lower knife can be shifted floating.

jj In this way it is possible to cut even heavy

I rifles which are already due to their own

• 15 weight by an operator to the

I Shaft 6 (knife shaft) no longer shifted by hand

i will be able to move easily.

I The knives or knife boxes can be used both to

I 20 minor as well as major stretches along the

? Wave 6 can be moved., As long as only the respective

: Knife the hole assigned to this knife

I covered. Through the exiting from the respective hole

The current pressure medium, especially compressed air, will be

j 25 respective knives or the respective knife sleeve

S raised small amounts compared to the cutter block

\ and can on a thin pad of between shaft

j and knife inserted pressure medium to slide. There-

! for it is not absolutely necessary to go inside

ι 30 of the knife, the knife sleeve or the knife holder

\, special chambers for holding the pressure medium

I incorporate. For example, it is also possible to use the

I Meöser, the lower knife box or the Messefhalter

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to raise within the game that is supported by the

'' mechanical production of the machine parts involved

is already specified.

It is also possible to use the respective upper knife

a certain cutting process with one and at! another cutting operation with a different edge

j of the respective lower knife or the respective

to let knife rifle work together. This increases Either the service life of the lower knife bushing or facilitated by moving the respective one at the same time Lower knife box compared to the upper knife, the production of strips of different widths from one Web to be cut out materials. In this way, the present invention aids in the conversion of one format to be cut and possibly wound onto another.

In addition, it may be possible to see between the knife shaft and the

j 20 serhalterung accumulating cutting dust by the pressure medium, be blown out of the device especially when using compressed air.

It is of little importance whether the respective lower cutters or their holders which are in contact with the shaft 6 are relatively wide or relatively narrow, such as, for example, the lower cutters ^ a or kc. It is also possible to have a separate supply line of pressure medium z. B. to assign compressed air, so that only this one lower knife or its holder opposite the * · shaft 6 axially

ι can be moved while the others on the white "

The lower blade located in the 6th position must be maintained.

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1 strip

2 track

3 outer knives

4 under knife f ^ a, 4b, 4c etc.)

5 wave

6 wave

7 axial bore

8 ball valve

9 screw

10 radial bore

11 radial bore

12 radial bore

13 Exit point 1 * Y exit point

15 exit point

16 upper half of the shaft

17 latch

18 hole or recess

19 compression spring

20 cams

21 wave

22 hand lever

23 switches

Claims (1)

Claim: Device for changing the position of knives, in particular of lower knives for looped cut when longitudinally cutting paper, foil, fabric or the like with ring-shaped lower knives or holders for these lower knives ₃ pushed onto at least one shaft, characterized in that one lower knife or per holder Per lower blade (4) in which the lower blade (4) or supports supporting shaft (6) at least one radial bore (10, 11, 12) is incorporated, the exit points (13j 14, 15) of this radial bore (s) within the axial one Area of the shaft (6) are arranged, which is constantly covered by this holder or the lower knife (4) even with slight displacement of the bracket or the lower blade (4) in the Lär gsrichtung of the shaft, the exit points (13, 14, 15) of the Bores are positioned in the upper half (16) of the shaft (6) when the shaft (6) is at a standstill, a positioning that enables the shaft (6) in Positioning device (17-22) that can be brought into engagement and a feed line (8) for introducing pressure medium into the radial bores (10, 11, 12) are provided.