ES2282555T3 - FOLDING MACHINE. - Google Patents

Abstract

The folding machine for box blanks (8) has a folding station (2) in which the side flaps (29,31) are folded and overlapped in a closure position. The station has conveyor (9) belts with the gap between conveyed blanks being dependent on the size of the tube formed from the blank. A closure station (4) is provided for the blank closure sections and also has a conveyor. There is an intermediate station (3) which has a conveyor to reduced the spacing between the blanks.

Description

Folding machine.

From the patent application document German DE-A-39.08.981 is known a folding machine, used to make cutouts for boxes folding in the form of flexible tubes for folding boxes. The cut-out for folding boxes correspond to the development of a box Folding finished, to be produced.

The folding box cutout is provided with the corresponding slits, which separate from each other at individual cover and bottom flaps.

So that the folding box can be straightened out of a simple way on the site of use, the cuts for folding boxes must be folded over themselves in two places, within the framework of a manufacturing process, and certainly of such so that the two lateral ends of the flattened box cutout Folding cover each other after the folding process, in order to be fixed there to each other. It turns out a flexible tube for folding box, which is closed in the peripheral direction. He Covering site is located, in the case of the folding box finished, in the vicinity of a corner and respectively of a edge.

The refolding must be done with a considerable precision, since in this way it is determined decisively the fidelity or angular accuracy of the folding box finished

The flattened flexible tube for folding box is compressed next to the two fold edges located in the outside, when straightening to form the folding box, in such a way that fits a fold or a fold along the two other edges of the box. After straightening the tube flexible for folding box, it is a square tubular piece in cross section, based on cardboard or corrugated cardboard, from the  the bottom flaps protrude in the axial direction and for the lid These can now be folded inwards, in order to stabilize the straightened flexible tube for folding box.

In order to produce the flexible tube for folding box, the so-called folding belts or folding tapes, which are placed next to the parts to be flip the cutout for folding box and force the folding to along the folding line. The folding tapes run with its stretch of work along a kind of line in spiral, acting on the parts to be folded a few pieces of support that settle on the folding belts. So that the folding movement take place in an orderly manner, the folding belts move with a circulation speed that corresponds to the circulation speed of the cutout for box folding.

After folding the box cutout folding, the folding box cutout is fixed by stapling  or glue in the folded position. For this, the called gluing heads, stapling heads or also wrapping heads

In the case of machine construction press brake according to the patent application document German DE-A-39.08.981 can be get working speeds at the folding stand, which are manifestly located above the speed of work, with which in the closing post, for example, the head Stapler can nail staples.

The speed of the folding machine is determined therefore essentially by the speed of closing post As relevant disclosure in this context is valid European patent application document EP-A-0.474.973.

Starting from this, it is the mission of the invention provide the fact that, depending on the dimensions of the flexible tube for folding box that in each case has to be produced, You can work with a higher speed.

The problem posed by this mission is resolves according to the invention with the characteristics of the claim 1.

In the case of the new folding machine, enter the folding post itself and the closing post an intermediate position is arranged, with whose help you can achieve a transformation of the flexible tube speed to folding box to be closed.

The folding post supplies the cuts for folding boxes in a fixed unalterable module. The module, in which is delivered folded cutouts for folding boxes, corresponds to the dimensions of the largest cutout for folding box in the direction of transport adding the necessary distance of security between successive cuts for folding boxes. In that case, the transport address of the box cutouts Folding on the machine corresponds to the height of the folding box straightened in the position of use, and respectively to the address of the undulations in the corrugated cardboard. In the case of cut-outs for larger folding boxes, which are to be elaborate with the machine, it is optimal to use a machine classical, since the supply of folded cutouts for Folding boxes are done with the same speed. with which I know You can fix the hose next to the closing post.

The empty spaces between flexible tubes for Folding boxes that follow one another are marginal. When, on the contrary, flexible tubes must be produced for folding boxes intended for low folding boxes, that is the that must be produced with a small ripple dimension, the empty spaces between cutouts for folding boxes, which they happen consecutively at the folding post, they are made correspondingly older. Correspondingly, it decreases machine performance, since in empty spaces between flexible tubes for folding boxes, which follow each other consecutively, no closing position can be closed another flexible tube for folding box.

By using the intermediate position, it becomes possible to dwarf the empty spaces in front of the post closing, so that the use of the closing post This one works so to speak with a higher speed, even when the time period of step per unit length of the flexible tube for folding box. The increase in speed comes from the elimination of large empty spaces between flexible tubes for folding boxes.

Therefore, it can be increased without any difficulty the speed of the folding post, and certainly in the extent to which the cutouts for folding boxes for boxes cardboard intended for low boxes, empty spaces are made higher among the cutouts for folding boxes. This way it can increase the number of flexible tubes for boxes folding that leave the closing post per unit of weather.

In this case, a yield of especially high production when the intermediate position works with a speed profile in which after receipt of the cutout for folding box from the folding stand increases first again speed even more, before it decrease the speed to the working speed of the workstation closing. In this way it is possible in the closing post a space especially small vacuum between cutouts for folding boxes that they follow each other consecutively.

Speed of raising of speed more beyond the speed of supply is due to a shortening of the time of occupation of the intermediate position. The shorter the period of occupation of the intermediate position, all the more other box cutouts can be supplied quickly foldable by the folding post, since then a reception of new cutouts for folding boxes at the stand intermediate becomes possible only when it is not already contained no cutout for folding box in the intermediate position. In other case, the intermediate position would run too fast low, which would lead to damage to the box cutout folding that comes from the folding post.

It is especially advantageous that Folding box cutouts never move empty along the way of transport from the folding post to the post of closure, but they are always imperatively transported. A idle running could negatively influence straightening of the cutouts for the folding boxes along the path of transport, so that the subsequent placement of the strip adhesive in the case of the curb, or also the gluing of the protruding portions or stapling respectively would make with an angular error.

An imperative transport of the cuts for folding boxes prevents orientation and straightening errors, and ensures that once the straightening has been achieved in right angle of the cutout for folding box towards the path of transport, this also remains all the way.

An additional improvement over time Intermediate position can be achieved, when your effective length, along which it is transported imperatively a cutout for folding box, is variable. Always and when that imperative transport through the intermediate position is not yet guaranteed, the intermediate position can accelerate from Widely free transport speed. Clippings for folding boxes, which are arriving, are not damaged, but by another part is imperatively introduced through the post of folding in the intermediate position.

The imperative transport of the cuts for folding boxes in the intermediate position can be achieved by holding  the cutout for folding box between at least two means of transport. So, transportation is certainly not continuous in form but in spite of everything it is continuous in friction, in such a way that with the acceleration forces that appear in the machine not a slippage of the clipping may appear in any of the cases for folding box. So, transportation is continuous in friction.

Otherwise, they are the subject of claims subordinated certain improvements of the invention. In this case, combinations must also be considered as claimed of features, to which no example is directed realization express.

The drawings schematically show a Example of embodiment of the invention. In them:

Fig. 1 shows the folding machine in series (in English online) according to the invention in an elevation view laterally greatly schematic and with the functional parts that are essential for understanding the invention,

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Fig. 2 shows the folding post in an elevation view in perspective, in the direction of a clipping for outgoing folding box, and

Fig. 3-7 show different operating states when transferring cutouts for boxes folding from the folding post through the post intermediate to the transport arrangement of the closing post, each time in a side elevation view.

Figure 1 shows a detail section of a folding machine in series 1. They are represented in a view in side elevation only the functional parts that are essential for the understanding of the invention.

To the series folding machine belongs a folding post 2, where coming from the right is They introduce cut-outs for folding boxes through an installation of sheets, not shown. Downstream of folding post 2 there is an intermediate position 3, which serves to adapt the working speed of the folding post 2 to a post of Close 4 located downstream. The closing post 4 is for example a curb station. In the curb station, by above the pile or overlapping site of a flexible tube for folding box it is glued with an adhesive tape 5 coated with a fusible glue, and in this way it is permanently fixed.

Also in the case of representation of the Figure 2 shows only the parts that are important for further understanding of the invention, in order to ensure the set visibility.

Folding post 2 has, above an upper side of a lower frame or frame, which extends horizontally and rectilinearly, which is not represented with greater detail, two guide rails 6 running parallel between they, whose upper sides 7, located at the same height, form sliding tracks or guide, on which they are moved the cutouts 8 for folding boxes, referred to Figure 2, coming from the right to the left through the post of folding 2.

In order to move the 8 cuts for boxes foldable along the guide rails 6, a transport device, of which two belts can be seen toothed 9, which run parallel to each other at a distance, between the guide rails 6. The top or rear side of both timing belts 9 is located in the plane, which is defined by the guide tracks 6, and supports cams 11, whose distance between they, seen in the longitudinal direction of a respective belt toothed 9, corresponds to the module distance of the post of folding 2 and therefore at the distance between centers of two 8 cuts for folding boxes, which follow one after the other. The two timing belts 9 move around the ends around direction change pulleys 12 and 13, which are supported by way capable of turning on axes 14 and 15 at the beginning and at end of the folding post 2. A set of rollers direction change pulleys 12, 13 is propelled, while the Another set moves in a loose state.

The speed with which the pulleys move in each case propelled, for example pulley rollers 13, corresponds to the working speed of the folding post 2.

Along both guide rails 6, the folding post 2 has in each case two pairs of belts endless bending machines 16 and 17, which in general extension begin laterally below the guide tracks 6 and end by above the guide tracks 6. The two folding belts 16, at Like the two folding belts 17, they are arranged in a symmetrical mode specularly in relation to the longitudinal axis of the folding post 2.

The folding belt 16 located on the side left of the folding post 2, seen in the direction of movement of the cuts 8 for folding boxes, moves around to two pulleys 18 and 19 for belt, which are supported so capable of rotating on axes 21, 22 of the base frame. One of the belt pulleys 18 and 19 are coupled with the device drive, in order to move the folding belt 16 synchronously with the toothed belt 9.

The exact height and lateral position of the two pulleys 18 and 19 of change of address is established from the subsequent description of a profile 23 provided by the side outside of the folding belt 16.

The folding belt 17 that follows in the direction of transport of the cuts 8 for folding boxes is endless, to same as the folding belt 16, and essentially runs as extension of the folding belt 16. The folding belt 17 is moves around two extreme belt pulleys, of which schematically represent only their axes of rotation 24 and 25.

Because of the disposition of the total four folding belts 16, 17 results next to each of the belts press brakes 16, 17 a working section, which moves in the direction of the transport movement of the cutouts 8 for folding boxes or of the flexible tube for folding boxes, and that cooperates with the cut 8 for folding box, while an empty section returns in the opposite direction empty without touching cutout 8 for box folding.

The 8 cuts for folding boxes are located, when they reach the folding post 2 first in fully flattened state, as shown in Figure 2 in the right side. They consist of a centerpiece 28 as well as two side flaps 29 and 31 joined in one piece with that. The side flaps 29 and 31 extend along lines of folding 32 and 33, eventually grooved in advance, in the centerpiece 28 and form in the case of the finished folding box of straightening two diagonally opposite corner edges, which They extend from the bottom of the folding box to its lid.

As an extension of the folding lines 32 and 33, the cutout 8 for folding box contains four slits 34, which pass in a piece inside the cutout 2 for folding box, and allow the subsequent rejection of a bottom flap 35 or top. Other grooves, which correspond to grooves 34, are found in the centerpiece 28 in order to produce, also in the case of the latter, corresponding background or top.

So when you refute the two side flaps 29, 31 the centerpiece 28 is not lifted from the tracks of guide 6 are provided retaining elements, which are formed by a large number of pulleys 36 that rotate so loose. These move on axes 37 that are located approximately 45º and are oriented in such a way that the outer peripheral surfaces of pulleys 36 which, seen from above, they are on guide tracks 6, tap on immediate proximity of fold lines 32 and 33 to 8 cutout for folding box. The centerpiece 28 is compressed from this way, immediately next to the folding lines 32, 33, on guide track 6, and cannot be lifted upwards, when the side flaps 29, 31 are retracted, starting from the flat position, to the position, as shown in the center in Figure 2.

The shafts 37 of the pulleys 36 are supported by a frame not shown, which is attached through a frame of bridge, also not shown, with the lower frame of the post folding 2, so that the cutouts 8 for folding boxes are can move freely through it.

The profile on the outer side of the straps folder 16, 17 is essentially staggered in the form of a tooth of saw, in such a way that a contact site of Linear shape with side flap 29, 31.

A cutout 8 for folding box in state flattened, which comes from the right, reaches the space between the guide rails 6 and pulleys 36. He is grabbed by cams 11 and transported in a right angle orientation with respect to the direction of transport along guide rails 6, from the right to the left referred to Figure 2. In the forward movement, side flaps 29 and 31 come into contact with its lower or rear side with the stretch of work 26 of the two folding belts 16. The course of working section 26 is chosen in such a way that it moves from outside the fold lines 32 and respectively 33 and by below a plane, which is defined by the surface of sliding 7, to a position in which the working segment 26 is located above the mentioned plane and within a plane vertical, which is defined by the folding line 32 and respectively 33.

This movement first imposes a straightening of the side flaps 29, 31 and finally leave the folding belt 16, a position directed towards inside the side flaps 29, 31. In this case the lines of folding 32, 33 act as hinges. The rejection 29, 31 on centerpiece 28 is finally completed by the two folding rails 17. Its working section runs entirely through above the sliding surface 7 of the guide rails 6, and certainly converging increasingly in the direction of the extreme  located downstream of the guide rails 6. Upon leaving the folding belt 17, the side flaps 29, 31 are folded on the centerpiece 28 and they cover each other along a strip 39.

The working speed of the post folding 2, that is the speed with which the cuts 8 for folding boxes are pushed through the folding post, and in this way they are folded at the same time, it is limited only by the mechanical resistance of the side flaps 29, 31.

During the forward movement, these are rebate around the folding line 32, 33, being supported  by the folding belt 16. The movement opposes the resistance of air, which is applied to those parts of the side flaps 29, 31, protruding above the folding belt 16. When the air resistance becomes too large, since it rises the folding speed is too high, the side flaps can bend over the folding belt 16. The speeds, which they are necessary for this, they are extremely high and practically They cannot be achieved properly. In either case, the folding post 2 can be operated with a speed higher than the subsequent closing position 4.

In the closing post 4 already mentioned, the flexible tubes 8 for folding boxes, previously folded in the folding post 2, are permanently closed along overlap zone 39.

In order to close the overlap zone 39 which eventually can also be a lot, they enter Consider several possibilities. In the overlap groove a hot glue can be introduced, in order to glue the areas that cover each other. In addition, there is the possibility of nail some staples in this area or the area is also closed by placing an adhesive tape. In this case, the tape adhesive is correspondingly located above the end of the overlap site.

Figure 1 shows, as an example of a closing post 4, one that works with adhesive tape 5. The Adhesive tape 5 consists of a paper backing, which by one of Their faces are coated with a fusible glue. The position of closure 4 is shown in Figure 1 greatly schematic He has several means of endless transportation 43, which revolve around roller assemblies 41, 42 of changing direction, in the form of straps or ribbons, that between sets of rollers 41 and 42 form a working section 44 located by above. Each set of rollers consists of rollers coaxial between them, which are eventually propelled in common.

Corresponding to the width of the folded flexible tubes 8 for folding boxes, are arranged next to each other several such endless means of transport 43. They form in a way a movable support table for the tube Flexible 8 for folding boxes, passing through it.

Above the lower continuous means of transport 44 several means of transport 45 are provided, in the shape of straps or ribbons, aligned with those, which rotate also around roller assemblies 46 and 47 of change of address. Each set of rollers also consists of rollers coaxial with each other, which are eventually propelled in common.

The lower zone, which extends between the roller assemblies 46 and 47, also forms a working section 48. The endless means of transport 45, which run above, are shown in a broken state, in order to provide the look at a housing 51, on which it is supported so capable of rotating a reserve roller 52 for the adhesive tape 5. The propulsion means for roller assemblies 46 and 47 do not They are shown.

Next to the lower side of the housing 51 is they find several tightening rollers 53, arranged one after others and supported in a way capable of turning, with which the tape adhesive 5 is applied under pressure on the flexible tube 8 for box folding that advances in front of them. To the closing post 4 belong also some devices to cut the tape 5 as well as a heating arrangement to heat the fusible glue and propulsion arrangements for rollers 52. These parts They have been suppressed for visibility reasons.

The working speed of the closing post 4 it is limited by speed, with which the fusible glue can be cast on paper tape 5. As a rule, then the working speed of the closing post 4 is less than the working speed of the folding post 2. The lowest speed of work is also valid for those closing positions 4, in which stick staples and also for those positions of adhesion, in which the overlap zone 39 is glued directly using fusible glue.

In the latter case the rhythm speed working results from the speed with which the glue fuse cools sufficiently in overlap zone 39, and prevents an outbreak of the overlap zone 39.

When, as in the state of the art, the closing post 4 follows directly to folding post 2, optimal operation of the total arrangement is possible in the if the cutouts 8 for folding boxes have a ripple dimension, corresponding approximately to the module distance When the ripple dimension is smaller, it is say that the flexible tube for folding boxes, seen in the transport direction, has a lower depth, appear considerable empty spaces. During the passage of the spaces gaps through the closing post 4 cannot produce any flexible tube 8 for folding box, even when the post folding 2 could supply this one properly with one more high speed

In order to compensate for the speed between two positions 2 and 4, intermediate position 3 is already planned mentioned. To this belong again several continuous means lower transport 55 in the form of belts or belts, which rotate through sets of direction change rollers 56 located upstream, and several sets of change rollers of address 57 located downstream. The working section of the endless means of transport 55 is located above as a stretch Working 56. This is supported by other rollers. additional or a sliding surface. Nail similar supports are also below those means of transport 43. These means of support are not shown in greater detail for visibility reasons. They are usual in the cases of such machines.

The distance between the roller assemblies of change of address 56 and 57 corresponds approximately to the dimension of a module, that is, at the distance of the pairs of cams 11 along the toothed belts 9.

The sets of direction change rollers 56 and 57 are arranged such that the cuts 8 for folding boxes enter from the folding post 2, of a smooth way and without crashing, within intermediate position 3 and from there they can be transferred without hitting the closing post 4. Facing work section 56 of each of the means of endless transport 55 other means of endless transport are found  59 in the form of straps or ribbons, which run upstream in around a set of direction change rollers 61 and downstream around a set of change rollers of address 62. Between the set of direction change rollers 61 and the direction change roller assembly 62 extends a section of work 63, which is retained with the help of several roller assemblies 64. Each of the roller assemblies 64, including the set of direction change rollers 61, is settles in cars and can be raised or lowered individually optionally through elements of linear propulsion 65. Following the last set of tightening rollers 64, movable vertically, follows a set of tightening rollers 66 rigidly supported, which sparingly upstream of the steering change roller assembly 62 is supported so that it can rotate on the machine frame, which is not shown additionally.

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Between the two sets of rollers 62 and 66 are finds a set of tension rollers 67 displaced towards above, which is previously tensioned upwards by means of spring means not shown additionally, in order to keep tension to the corresponding endless means of transport 59.

Two sets of guide rollers 68 serve to impose an evolution in the form of omega to the empty section between two sets of rollers 62 and 66.

All roller assemblies, before mentioned, of intermediate position 3 contain several rollers coaxial between them.

By raising or lowering the set of rollers 61 and by a greater or lesser number of sets of rollers 64 can be lengthened or shorten the transport length effective, through which a cutout 8 for folding box is imperatively transported between the upper means of transport 55 and the lower means of transport 59. The longest adjustment is establishes when all means of propulsion 65 have done descend to the pinch roller assemblies 64 associated with them, including the change roller assemblies of address 61. The shortest effective length of work results when all sets of clamping rollers 64, including at set of direction change rollers 61, which is arranged on the side of the entrance, they are in a position raised.

The raised position is a type position in which the gap between working sections 56 and 66 is greater that which corresponds to the thickness of the cutout 8 for folding box previously formed and folded.

In order to explain the mode of operation of the folding machine 1, it will be assumed first that make some 8 cutouts for folding boxes, whose length corresponds approximately to the module dimension, subtracting a safety distance. The empty space between cutouts 8 for boxes folding, which follow one another consecutively, is optimally small. The closure arrangement 4 works practically uninterrupted The only interruptions are the distances of safety, relatively short, which are essentially established to from the length of the cams 11, measured in the direction of transport.

In such a case of operation, the timing belts work with the same circulation speed as endless means of transport 55 and 56 or respectively that means of transport 43 and 45. Each cut-out 8 for folding box is transported without changing the speed through the machine.

As the next issue, the Ripple dimension of the cutout for folding box is approximately 30% of the module dimension. In these circumstances, the empty space between 8 cuts for boxes folding, which follow one another consecutively. it's about two thirds of the dimension of a module. That is, compared to the previous operating state, the closing position 4 (5) is found in two thirds in an inactive state. With the purpose of increase production yield, then the speed of work of the folding post 2 is increased in such a way that, by eliminating the empty spaces between the cuts 8 to folding boxes that follow each other consecutively, it is established finally a stream of clippings 8 for folding boxes, whose circulation speed is in turn equal to the working speed  of the closing post, however having the current only a small empty spaces between 8 cuts for boxes folding, which follow one another consecutively. In order to reach this goal, intermediate position 3 is operated in the manner then described. In this case hereafter will be done reference to Figures 3-7.

In these Figures, from the folding post 2, of intermediate position 3 and the closing position are shown only endless means of transport, since in this context it's only about the relationship between the cuts for boxes foldable

In the folding post 2, the cuts 8 for folding boxes they are transported with continuity of form using cams 11 while transport in the post intermediate 3 and in the closing position it is done by friction continuity, in which the cutout 8 for folding box it is held between vertically opposed means of transport between they.

The synchronization is chosen in such a way that no there is no state, except on the exit side of the post closure 4, in which a respective cutout 8 for folding box does not be imperatively transported. A movement is excluded free.

In order to explain how operation, it will be assumed that according to Figure 3 a couple of cams 11 delivers precisely then a cutout 8a for box folding on the entry side of intermediate post 3. During the delivery status in the state subject to intermediate post 3 the cams 11 work with the same circulation speed as the means of transport 55 and 59 of intermediate post 3. As soon as the cutout 8 for folding box is held between the means of transport 54 and 59 of intermediate post 3, the provision of regulation, not shown, of the folding machine begins to increase the propulsion speed of intermediate post 3. With a high speed, cutout 8a for folding box is introduced in intermediate position 3. In this case, with a speed increased, the delayed edge of the cutout 8a for folding box leaves cam 11. Acceleration of transport speed in intermediate position 3 begins, as soon as along a sufficient area the cutout 8a for folding box is held between the two means of transport 54 and 59, and there is no longer the danger of a slip.

Figure 4 shows a situation in which the 8a cutout for folding box is fully introduced. At case of Figure 5, the cutout 8a for folding box begins to gradually exit from the exit side of intermediate post 3. From a certain position of the advanced edge, the 8a cutout for folding box begins to shrink again the speed with which the two means of transport 55 and 59 work of intermediate position 3. The magnitude of the delay, and respectively the moment this delay begins, they depend essentially of the energy consumption that must be invested for the delay. In Either case, it ensures that the movement speed of cutout 8a for folding box, which leaves from the stand intermediate 3, equal to the transport speed at the post of close, as soon as, according to Figure 6, the cutout 8a for folding box start to enter the closing post 4 and be  subject between its means of transport 43 and 45. The speed of the means of transport 55 and 59 is maintained at the level of the means of transport 43 and 45 for so long until, according to the Figure 7, the delayed edge of the cutout 8a for folding box You have left the holding area of intermediate post 3.

From this moment, it is increased again the movement speed of intermediate position 3, until it has reached the speed of the timing belts 9. The period of time, which is available for this, corresponds to space empty between the advanced edge of the next cutout for box folding, which is located on the timing belts 9, and the area Entry into intermediate position 3.

The sense and purpose of the speed of high lift at intermediate position 3 are explained without difficulties based on a joint vision of Figures 4, 5 and 6. Intermediate position 3 is occupied as of the moment that the advanced edge of a cutout 8 for folding box enters the holding area of intermediate position 3, until the edge rear has left the holding area. During this time of time, intermediate position 3 cannot receive any other 8 cut-out for folding box, since delivery to the post of Close 4 must be done with your speed. Therefore, the occupation time period, in which delivery from the intermediate post 3 to the closing post appears so unalterable, it is dependent only on the length of the cutout 8 for folding box, seen in the direction of transport.

On the contrary, the transport speed, with which the intermediate position 3 works, between the states of operation according to Figure 3 and according to Figure 5, may vary arbitrarily within wide limits and with this shorten the occupation time of 3. The faster this one is free again, both before it can be supplied from the folding post 2 a new cutout 8 for folding box. The intermediate over-elevation of the transport speed in the intermediate position 3 above the supply speed by the folding post 2, reduces the period of occupation time of intermediate position 3 and, therefore, is a contribution to further increase the working speed of the installation global.

Acceleration and delay of moving parts in intermediate position 3 requires energy. The energy consumption is all the higher the faster these modifications have to be made. This means that the longer the undulation dimension of a cut-out 8 for a collapsible box, the shorter the period of time between the transition of the states from Figure 7 to Figure 3 would be. acceleration. In order to be satisfied, however, with a useful acceleration time, depending on the undulation dimension, the length of the clamping area in the inter- position is modified.
medium 2.

The length of the clamping zone is like minimum as long as that corresponding to the distance between the set of direction change rollers 47 and the set of tightening rollers 66. The greatest length of the clamping area is get when all sets of pinch rollers 64, including the set of direction change rollers 61 located on the side of the entrance, they are taken to the lower position corresponding to that position. For cutouts 8 for folding boxes with a large undulation dimension the clamping area is shortened, in which the set of direction change rollers 61 is first raised above the propulsion element 65. Of this way a state is reached in which, without danger and without problems, the speed of means of transport 55 and 59 in the intermediate position 3 when entering a cutout 8 for folding box can be even less than what corresponds to the speed of cutout circulation 8 for folding boxes you are entering. The synchronism between movement speeds must have reached only when the cutout 8 for folding box reaches the clamping area

The larger the ripple dimension, the more roller assemblies 64 are also raised. Of this so the intermediate position acquires time so that, after having the delayed edge of a cutout 8 for folding box with the speed of the closing post 4, the means of transport 55 and 59 of intermediate position 3 can be increased at the speed of 9 belts belts suppliers.

A folding machine has between the position of folding itself and the closing post a post intermediate. The intermediate position serves to close, in the case of small cutouts for folding boxes, the existing empty space between cutouts for folding boxes, which follow each other consecutively, in order to achieve in this way a greater production yield The speed with which the job works folding, can be increased above the speed, with which can work at most one closing position.

So that in the case of a modification of the clippings for folding boxes may not appear no orientation and straightening error, the cuts to folding boxes are imperatively transported in any of the cases.

Claims (19)

1. Folding machine to produce tubes flexible (8) for folding boxes from cutouts (8) for folding boxes, which have side flaps (29, 31),

with a position of folding (2), in which the flaps are folded inwards lateral (29, 31), such that in a closing zone (31) bump into each other or cover each other, taking the position of folding (2) means of transport (9), with the help of which are transported in an unalterable module in relation to each other the cuts (8) for folding boxes and respectively the tubes flexible (8) for folding boxes, realizing that the space vacuum between flexible tubes (8) for folding boxes that they follow each other consecutively, it is dependent on the size of the tube flexible (8) for folding box, measured in the direction of transport,

with a position of closure (4), in which the closure zone (39) is closed so durable and permanent, and that has the means of transport (43, 44), with whose help the flexible tubes (8) are transported to folding boxes,

and that is characterized by

a job intermediate (3), which is arranged between the means of transport (9) of the folding post (2) and the means of transport (43, 45) of the closing post (4), and which is established to adapt the transport speed of flexible tubes (8) for boxes folding, leaving the folding post (2), to the speed of means of transport (43, 45) of the closing post (4) and at the same time to reduce the empty space between tubes flexible (8) for folding boxes that follow consecutively.

2. Folding machine according to claim 1, characterized in that the working speed of the folding post (2) is modifiable. 3. Folding machine according to claim 1, characterized in that the working speed of the closing post (4) is unchanged in the case of stationary operation. 4. Folding machine according to claim 1, characterized in that the working speed of the closing post (4) is less than the maximum working speed of the folding post (2). 5. Folding machine according to claim 1, characterized in that the intermediate position (3) works in a manner corresponding to a speed profile, such that after receiving a cut-out (8) for folding box, its speed of transport is first increased to a value that is greater than the speed with which the folding post (2) supplies the cutout (8) for folding box, and because before delivery to the closing post (4) the speed of transport is reduced to the speed of the closing post (4). 6. Folding machine according to claim 1, characterized in that the intermediate position (3) has a variable effective working length, along which a cut-out (8) for folding box is essentially transportable without slipping. 7. Folding machine according to claim 1, characterized in that the intermediate position (3) has a lower transport arrangement (55) as well as an upper transport arrangement (59), and that the cut-out (8) for folding box is it can be held between the lower transport arrangement and the upper transport arrangement (55, 59). 8. Folding machine according to claim 7, characterized in that the effective length of the lower transport arrangement (55) is unchanged and corresponds at least approximately to the dimension of the folding post module (2). 9. Folding machine according to claim 7, characterized in that the effective working length of the upper transport arrangement (59) is variable, such that the area, along which a cutout (8) can be held ) for folding box, it is adjustable to a shorter length. 10. Folding machine according to claim 7, characterized in that the lower transport arrangement (55) has at least two endless conveyor belts, which rotate through sets of direction change rollers (56, 57) and whose section Working (58) is supported between the sets of direction change rollers (56, 57). 11. Folding machine according to claim 7, characterized in that the upper propulsion arrangement (59) has at least two endless conveyor belts, which rotate through sets of direction change rollers (61, 62) located in the ends, and because between the sets of direction change rollers (61, 62) additional clamping means (64) are provided for the working section (63). 12. Folding machine according to claim 11, characterized in that the clamping means are formed by additional roller assemblies (64). 13. Folding machine according to claim 11, characterized in that the set of direction change rollers (61), located upstream of the transport section, can be ventilated. 14. Folding machine according to claim 11, characterized in that the means of tightening between the sets of direction change rollers (61, 62) can be ventilated by segments. 15. Folding machine according to claim 11, characterized in that at least the first of the pinch roller assemblies (64), located upstream, of each of the upper endless conveyor means (59) can be ventilated. 16. Folding machine according to claim 1, characterized in that the roller assemblies (64) serving as support means for the upper endless conveyor means (59), can be lifted into a piece, so that it can be suppress the clamping effect between the working sections of endless means of transport (55, 59) that cooperate with each other. 17. Folding machine according to claim 1, characterized in that the closing position (4) is a curb station. 18. Folding machine according to claim 1, characterized in that the closing position (4) is a stapling position. 19. Folding machine according to claim 1, characterized in that the closing post (4) is a position that works with an adhesive glue.