EP1976682B1 - Method for production of cut-outs made from cardboard or cardboard-like materials and corresponding device - Google Patents

Abstract

This invention relates to a method for the production of blanks made of cardboard or of cardboard-like material and a device suitable for it. An integrated plotter module by which the individual workpieces are positioned in the longitudinal direction by the transfer drive is an important feature.

Description

The present invention relates to a method for the production of blanks from cardboard or cardboard-like materials with the features of the main claim and to an apparatus for carrying out the method according to the preamble of claim 4.

Such procedure belongs to the scope of the EP 1638764 ( WO 2005/000 570 ) become known features of the prior art.

With such a method, it is possible, in addition to the usual in carton blanks longitudinal and transverse processing lines, for. As cutting, creasing, perforation, punching and folding lines and processing lines to attach to the carton blank that run either exclusively in the longitudinal or exclusively in the transverse direction.

With the longitudinal direction of the workpiece or carton blank is meant that direction which is defined by the direction of movement of the transfer drive, with the aid of which the workpieces, starting from the catchment area in the machine, are conveyed through the individual processing stages.

If the longitudinal directions of all processing modules to be traversed successively are on a single continuous straight line, this is referred to as a so-called inline machine (see, for example, Klett's catalog).

In addition to printing modules, punching modules, perforation modules, etc., the processing modules include all the individual assemblies required in the production of such carton blanks, within which the blanks are each subjected to a special type of processing.

As mentioned above EP 1638764 is already known, there are a variety of standardized carton blanks, which require an oblique to the longitudinal direction processing, so that the present invention has the fundamental task of further developing the already known method so that the exclusively exclusively longitudinally or exclusively transverse machining directions under a simplified effort can be approached by the appropriate tool.

This object is achieved by the invention with the features of claim 1.

A device suitable for this purpose results from the features of claim 4.

The invention is based on the basic idea of designing the plotter module or the plotter module such that the respective machining tool can only be moved transversely on the plotter module, while the necessary longitudinal direction of the machining is not effected by the plotter module itself but by a correspondingly redesigned transfer device for transporting the cardboard blank the processing machine is realized through.

The transfer device is designed for this purpose so that, preferably via a control electronics, both forward and backward in the longitudinal direction is movable, if possible with variable speed.

The carton blank taken along by the transfer drive is therefore moved under the processing head of the plotter device solely by the transfer drive of the processing machine, while the processing head of the plotter device is movable exclusively transversely to the longitudinal direction.

Thus, only the drive motors for the transverse direction on the plotting device and for the longitudinal direction on the transfer drive must be combined with each other so that any oblique machining direction is made possible on the carton blank. This is done via variable speeds in the longitudinal or transverse direction.

Mathematically, this is done by vectorial addition of the respective velocities in the longitudinal and transverse directions.

The advantage of the invention lies in particular in the savings of an additional longitudinal drive in the plotter module, because the carton blank is guided in any case by the transfer drive of the machine in the longitudinal direction through the plotter.

This has recognized the invention and, based on this, makes use of a control system with the aid of which the individual controllable drive motors are added both for the longitudinal direction and for the transverse direction in the sense of the mathematical addition of the respective velocity components.

It should therefore be expressly stated that the plotting device only allows a drive movement of the processing head in the transverse direction, while the longitudinal direction, in which the workpiece must move, is realized by the transfer drive of the machine tool.

In this way, the usual length of such corrugated cardboard processing machines can be significantly reduced.

Without departing from the basic idea of the invention, the plotting device can even create longitudinal machining lines in the case of a machining head that is stationary in the transverse direction, or machining lines running in the transverse direction in the longitudinal direction of the stationary transfer drive.

Obtained in this way a significantly reduced construction costs, because in principle even the usual flat bed punch or rotary die can be missing.

Namely, the plotting device according to the invention is also capable of executing the numerous processing lines produced by flat-bed punching or rotary blanking.

The cost of such overall machines is therefore considerably reduced and the entrepreneur side vorzuhaltenden building sizes also.

Preference is given to a development in which the transfer drive of the workpieces, starting behind the feed station and preferably up to a downstream stacking device is exclusively on a single straight line.

In this way you get to a plotter module, which can be easily inserted between existing editing modules.

In order to achieve a stepless as possible oblique processing line, it is additionally proposed that the processing tool of the plotting device is rotatable during the processing of each individual workpiece in any rotational position, resulting from the vector addition of the velocities in the longitudinal and transverse directions at each time of processing.

In this way, the machining tool is always exactly parallel to the processing line that has to be produced, so that in accordance with fine digital processing of the control data and optically circular contours can be cut or the like. It is also possible to provide inline instead of a single plotter several such plotter modules, of which, for example, a first plotter module generates cut lines, the next plotter module perforation lines, the third plotter module creasing lines, etc.

It is essential for all such plotter modules that the movement component of the machining head is realized only in the transverse direction, while the longitudinal direction is effected by movement of the workpiece by means of the transfer drives.

The invention has recognized to the extent that it depends solely on the relative movement between the machining head and workpiece for the processing of such workpieces and thus saves on the plotter a separate longitudinal drive, which, however, is replaced by the correspondingly redesigned transfer drive.

It may well happen that the individual processing of each workpiece in the plotter module takes more time than in the other modules.

For this purpose, it is proposed that at least the speeds of the upstream processing modules can be reduced in such a way that sufficient time is available for processing in the plotter module.

The reduction of the speeds can go to a standstill.

In addition, the processing head on the plotter module has a vertical axis of rotation about which it can be stored by means of a separate drive in any desired rotational position.

The respectively required rotational position results from the vectorial addition of the speeds in the longitudinal direction and transverse direction.

In this way, the machining tool is always exactly parallel to the respective oblique direction, in which the processing line points at the point of processing.

To avoid an unnecessarily large slippage is also proposed to realize the transfer drive in the plotter module by pairs provided transport rollers, each of which a pair in front and a pair behind the processing head of the plotter module sits so that the workpiece can pinch between the transport rollers during it is transferred forward or backward.

For this purpose, embodiments are given.

In the following the invention will be explained in more detail by means of exemplary embodiments.

• Fig.1 ein erstes Ausführungsbeispiel der Maschine;
• Fig.2 Detailansicht eines geeigneten Transferantriebs;

Show it:

• Fig.1 a first embodiment of the machine;
• Fig.2 Detailed view of a suitable transfer drive;

Unless otherwise stated below, the following description applies to all figures.

The figures clearly show the process for producing blanks 1 of cardboard or cardboard-like materials according to the present invention.

From these blanks 1 usually cartons are formed to sell predetermined goods.

Starting material for the present process are workpieces 2 of originally arbitrary starting form.

These are usually corrugated cardboard or cardboard blanks of rectangular outline. These workpieces are trimmed by longitudinal processing lines 3, transverse processing lines 4 and beyond oblique processing lines 5 to windings 50 of the cardboard to be manufactured.

The processing lines are cuts, slits, cracks, grooves, perforations or even fold lines.

As the lower secondary figure shows, 1 processing lines 5 can occur in such blanks, which extend neither exclusively in the longitudinal nor in the transverse direction.

In this case, the longitudinal direction is defined by the so-called transfer drive direction 6, in which direction the workpieces 2 are guided through the individual processing stages 7a, 7b, 7c.

In the present case, it is a so-called inline machine, in which all transfer drive directions of the individual processing stages 7a-c lie on a single straight line.

It is essential that those processing lines 5, which run neither exclusively longitudinally nor exclusively in the transverse direction, are produced by a plotting device 8, which has a working head 9 movable in parallel above and relative to the plane of the workpiece to be machined, which at a predetermined distance from the workpiece Workpiece is movable only in the transverse direction to each point of the respective processing line, is activated for processing at each point of the workpiece and then driven in the activated state along the respective inclined processing line 5 with controlled feed only in the transverse direction 10, while the workpiece simultaneously in the longitudinal direction is positioned by means of the transfer drive 11 of the machine processing relative to the working head 9 of the plotter 8.

It is therefore essential that the machining head 9, which also serves as a tool carrier, can only be moved transversely to the workpiece via a suitable electromotive drive device, while the workpiece is positioned for processing by the combined control of the above-mentioned motor drive device and the drive device for the transfer drive 11.

The longitudinal direction 12 of the plotter movement is therefore realized by appropriate control of the transfer drive 11.

In addition, the machining head with its tool carrier on a rotary head 13, so that the machining tool or the tool carrier of the plotting device 8 is rotatable during machining of the respective workpiece 2 in any rotational position resulting from the vectorial addition of the speeds in the longitudinal direction 12 and transverse direction 10 results.

The rotary head 13 has a rotary drive 14 suitable for this purpose, which, just like the transfer drive 11 and the drive for the transverse direction 10, is acted upon by control signals by an electrical control 15 in order to attach the desired obliquely extending processing line to the processing machine.

The electrical control 15 for the plotter device has as input the geometric data of the finished blank 1, so that the corresponding positioning of the workpiece 2 can be done while the necessary movements in oblique direction of the respective processing lines by simultaneously controlling the motors of longitudinally and transverse drive.

In the present case, the processing modules 17a, b, c are arranged directly one after the other.

Since, of course, the plotting device, depending on the time required for processing, can cause a backwater in that area of the machine, which is passed in front of her from the workpieces, a further electronic control 16 is provided, with the help of at least the speeds of the upstream processing modules here only 17a can be slowed down so that the plotter module 19 receives the time necessary for the respective machining of the workpiece 2.

What is essential here is the coupling of the drives for the longitudinal and transverse directions on the plotter module such that the speed of the one motor drive, e.g. is controlled for the longitudinal direction in dependence on the speed of the other motor drive.

This is expediently carried out according to the master-slave principle, with the master serving both the drive for the longitudinal direction and the drive for the transverse direction can, while the complementary drive takes over the slave function and vice versa.

The reduction of the transfer speeds in front of the plotter module 19 relates in particular to all drive units which are arranged between the feed station 18 and the input to the plotter module.

This does not necessarily apply to the processing modules downstream of the plotter module, but can certainly make sense to obtain predetermined processing cycles.

In addition, the shows Fig.1 in the lower part different stages of production of an originally rectangular workpiece 2, in which initially round holes are introduced (first processing step), further oblique cuts or perforation (further processing step) and then a corresponding outer contour, as it must have the carton blank (third processing step) ,

It is therefore entirely possible to carry out these different processing steps in one and the same plotter device 8.

It is also possible to provide a separate plotter device 8 for each individual type of processing steps.

Further shows Fig.1 a development in which the machining tool 20 is rotatable on the plotting device 8 about a vertical axis in any rotational position.

Serves for this purpose is a rotary drive 14 acting on the rotary head 13, which is controllable in such a way via the electric control 15 for the plotter module during the machining of the respective workpiece that the respective rotational position from the vectorial addition of velocities in the longitudinal and transverse directions.

In addition to this shows Fig.1 a further development in which the machining tool 20 of the plotter module 19 is seated on a transverse bridge 25 rigidly connected to the machine frame and can only be moved in this direction in the transverse direction 10.

For static reasons, this bridge is rigidly connected to the machine frame on both sides.

However, other constructive solutions may also be found, e.g. Telescope drives.

In addition to this shows Fig.2 a special embodiment of the transfer drive in the plotter module 19th

For this purpose, in each case in pairs and above or below the workpiece 2 arranged transport rollers 21a, b and 22a, b are provided.

In each case, a pair of these transport rollers 21a, b and 22a, b sits in front of and behind the processing head 9 of the plotter 8 and clamps between them the workpiece 2 so that it by appropriate rotation of the feed rollers 21a, b, 22a, b in the corresponding forward or backward transfer direction is driven.

This is achieved here by the fact that the two lower transport rollers 21b, 22b are driven in the same direction of rotation via a common revolving drive belt, while the two upper transport rollers 21a, 22a are driven in the same direction of action via a respective separate belt 24a, 24b. The drive is slip-free, z. B. via timing belt.

LIST OF REFERENCE NUMBERS

1

cut

2

workpiece

3

Processing line, longitudinal

4

Processing line, transverse

5

Processing line, diagonally

6

Transfer drive direction

7a

first processing stage

7b

second processing stage

7c

third processing stage

8th

plotter

9

Working head, machining head, tool carrier head

10

Transverse direction of the movement of 9

11

Transfer drive on the plotter

12

Longitudinal direction of the plotter device

13

turret

14

Rotary drive for 13

15

electronic control for 8

16

electronic control of the remaining transfer drive

17a

first processing module

17b

second processing module

17c

third processing module

18

feed station

19

plotter

20

processing tool

21a

upper transport roller

21b

lower transport roller

22a

upper transport roller

22b

lower transport roller

23

common drive belt

24

Koppel belt

24b

Koppel belt

25

cross bridge

50

completion

Claims (8)

1. A method for the manufacture of cuttings (1) of cardboard or cardboard-like materials for the purpose of selling goods, of which flat workpieces (2) of original arbitrary shape display by processing lines running longitudinally and where necessary also laterally like intersection lines, creasing lines, perforation lines, punch lines and fold lines for the execution (50) of a manufactured cardboard structure prepared and in addition other processing lines (5), which run neither solely in a longitudinal nor solely in a lateral direction, where the longitudinal line is defined through the transfer gear (6), whereby said workpieces (2) are transported in succession through the several machining phases (7a, b, c) of the production machine, in which the cuttings are each subjected to a machining method, and where the other processing lines (5) that neither run solely in a longitudinal nor solely in a lateral direction are generated from a movable plotter device (8) that is parallel and relative to the level of the workpieces (2) for machining, of which the working head (9) is powered with a specified separation distance in the workpiece (2) manoeuvrable solely in the lateral direction (10) at each point of this other processing line (5), able to be activated for processing at each point and is powered with controlled feeding in the lateral direction (10) in the activated state along the respective other processing line, and that the workpiece (2) is positioned at the same time in the longitudinal direction by means of the transfer gear (11) processing-compliant with the machine relative to the working head (9) of the plotter device (8) and that the transfer speed of the protruding processing phase is slowed in such a way that the plotter device (8) saves the necessary time in the processing of the workpiece (2).
2. The method according to claim 1, characterised in that the transfer drive (11) of the workpieces (2) takes place through the machine on a single straight line.
3. The method according to claim 1 or 2, characterised in that the processing implement (20) of the plotter device (8) is rotary during the processing of the relative workpieces (2) in each arbitrary rotational position that arises from the vectorial addition of the velocity in longitudinal and lateral directions at each point in the process.
4. Equipment for the implementation of the procedure for one of the claims 1 to 3, with several processing modules (17a, b, c) arranged in succession, in processing direction of the workpieces (2), like cutting, creasing, perforation, punching and folding modules and with a transfer gear for the transport of the products between the feeder station (18) in the machine and the subsequent processing modules (17a, b, c), characterised in that at least a single plotter module (19) is provided, at which the workpiece (2) is controllable in the longitudinal line of the manufacturing procedure position-wise through the transfer gear (11) of the processing machine both forwards and backwards and likewise subject to the relative lateral (10) velocity one of these portable processing implements (20) lying in a longitudinal direction in this plotter module (19) at right angles to the longitudinal direction.
5. Equipment for claim 4, characterised in that the processing modules (17a, b, c, 19) directly follow each other and that during the forward/backward actions at least the velocity of the mounted processing modules (17a) in terms of the time required on the plotter module is reducible.
6. Equipment for one of claims 4 or 5, characterised in that the processing implement (20) on the plotter module (19) is rotatable by a vertical axis in each arbitrary rotational position and able to be controlled in such a way during the processing of the respective products that the respective rotational position arises from the vectorial addition of the velocity in the longitudinal and lateral directions.
7. Equipment for one of the claims 4 to 6, characterised in that the transfer gear (11) in the plotter module is formed through each pair of coordinated transport rollers (21a, b; 22a,b) above and below the product, of which each one pair (21a,b) sits in front and one pair behind the processing head (9) of the plotter modules (19) and that all transport rollers (21a, b;22a, b) are each drivable at the same time and with the same effective direction on the workpiece (2).
8. Equipment for one of the claims 4 to 7, characterised in that the processing implement (20) sits on a fixed cross bridge (25) linked to the machine frame and is manoeuvrable on this solely in a lateral direction (10).

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