NL2018039B1 - Knife and cutting device provided with it - Google Patents

Abstract

The present invention relates to a knife comprising a carrier, at least one pair of long teeth extending from the carrier, and wherein at least one short tooth is arranged between each pair of long teeth. The invention further relates to a cutting device, comprising a wall with a passage opening which is adapted for passing through an object to be cut through, and such a knife that is movable substantially parallel to the wall along the passage opening.

Description

Patent center

The Netherlands

2018039

BI PATENT (21) Application number: 2018039 (22) Application submitted: 21/12/2016 £ l) Int. Cl .:

B62D 1/08 (2017.01) B26D 1/09 (2017.01) B26D 1/10 (2017.01) B26B 9/02 (2017.01) B26D 1/00 (2017.01)

Application registered: (73) Patent holder (s): 28/06/2018 Cologic B.V. in AUSTERLITZ. (43) Application published: - (72) Inventor (s): Ronaldus Cornells Johannes Verbraak (47) Patent granted: in AUSTERLITZ. 28/06/2018 (45) Patent issued: (74) Agent: 23/07/2018 ir. P.J. Hylarides et al. In The Hague.

© Knife and cutting device provided therewith © The present invention relates to a knife, comprising a carrier, at least one pair of long teeth extending from the carrier, and wherein at least one short tooth is arranged between each pair of long teeth.

The invention further relates to a cutting device, comprising a wall with a passage opening which is adapted for passing through an object to be cut through it, and such a knife that is movable substantially parallel to the wall along the passage opening.

NL BI 2018039

This patent has been granted regardless of the attached result of the research into the state of the art and written opinion. The patent differs from the documents originally submitted. All submitted documents can be viewed at the Netherlands Patent Office.

Knife and cutting device provided with it

The invention relates to a knife and to a cutting device which is provided with such a knife.

Various machines are used in the paper processing industry, such as punching machines and sheeters.

In a punching machine, pieces of paper and cardboard are punched in a predetermined shape, for example, in order to subsequently be able to be folded into a package, such as a cardboard box. The residual material that is released during such punching operations is often provided with irregular shapes, as a result of which this residual material regularly catches something behind during its removal and leads to a malfunction. Such malfunctions often occur several times per hour in practice, and resolving them is labor-intensive and time-consuming. There is therefore a need to cut the residual material into small and manageable pieces and thus prevent malfunctions.

NL2015719 describes a cutting device developed by the Applicant that has been developed for cutting ribbon-shaped paper or cardboard strips in an automated process, which are also referred to as strips. Such a ribbon is from a few centimeters to about 10 centimeters wide and can be as long as 1500 meters, and is therefore very difficult to handle. On the one hand, such a ribbon is very thin and therefore behaves very flexibly, allowing it to penetrate into small cracks and get stuck there. On the other hand, paper being pressed can form a very stiff accumulation.

The device described in NL2015719 has been developed for cutting ribs for applications in which the supply of residual material, i.e. the volume flow, is relatively limited and preferably fairly constant. In practice, however, situations also occur in which the volume flow of the residual material is highly variable, for example varying from one sheet of paper to several layers of corrugated cardboard. The reifel can also sometimes have a width that approximates the width of the entire passage opening. In the case of stacked layers of cardboard and wide ribs, an exceptionally high load is created on the knife, resulting in considerable wear, whereby a knife becomes blunt after approximately 60,000 cutting movements. In practice, such a number of cutting movements can already be achieved in 24 hours. It is labor intensive and undesirable to have to replace and sharpen the knife every 24 hours.

An object of the present invention is to provide a knife and a cutting device provided with it, wherein the disadvantages mentioned do not occur, or at least to a lesser extent.

The said object is achieved according to the invention with a knife comprising a carrier, at least one pair of long teeth extending from the carrier, and wherein at least one short tooth is arranged between each pair of long teeth. The long teeth first touch an object to be cut, such as a paper or cardboard cane, and then penetrate the object, whereby bores are formed in the object to be cut at some distance from each other. If the long teeth are subsequently pushed further into the object to be cut, the short tooth arranged between a pair of long teeth comes into contact with the object to be cut. The short tooth will thereby touch the object to be cut between the bores already formed by the long teeth. The long teeth still extend through these openings, thereby fixing the object to be cut when the short tooth comes into contact with the object. When the knife is subsequently pushed further, the short tooth will cut through the material of the object to be cut in the space between the two bores already formed by the long teeth. The long teeth thus provide a first penetration step, after which the one or more than one short tooth between the long teeth cuts through the remaining material in a cutting step.

The said object is further achieved according to the invention with a cutting device, comprising:

- a wall with a passage opening which is adapted for passing through an object to be cut through; and

- a knife according to the invention movable substantially parallel to the wall along the passage opening.

Particularly advantageous preferred embodiments are the subject of the dependent claims.

In the following description, preferred embodiments of the present invention are further explained with reference to the drawing, in which:

Figure 1: a representation of a cutting device according to the invention;

Figure 2: a perspective view of a first preferred embodiment of a knife according to the invention;

Figure 3: a top view of the knife shown in Figure 2;

Figures 4-9: plan views of successive steps of cutting through an object with the knife of figures 2 and 3;

Figure 10: a view of the object to be cut in the step shown in Figure 4; Figure 11: a view of the object to be cut in the step shown in Figure 7; Figure 12: a view of the object to be cut in the step shown in Figure 8; Figure 13: a view of the object to be cut in the step shown in Figure 9; Figure 14: a view of the object to be cut;

Figure 15: a perspective view of a further preferred embodiment of a knife according to the invention; and

Figure 16: a top view of the knife shown in Figure 15.

The perspective view in figure 1 shows a cutting device 1, comprising a wall 2 with a passage opening 3 which is adapted for passing through an object 4 to be cut through, and a movable substantially parallel to the wall 2 along the passage opening 3 Knife 5. The passage opening is at least partially free during a stroke of the movable knife 5 along the passage opening 3, as a result of which jamming of supplied objects to be cut 4 is prevented. To prevent workers from being exposed to the knife 5, the wall 2 preferably forms part of a housing 6, the housing 6 accommodating the movable knife 5 during its complete stroke.

The cutting device 1 comprises an input 24 where the objects 4 to be cut are input. From the input 24 the objects 4 to be cut are transported with conveyors 25 to the passage opening 3.

In the embodiment shown, adjacent the passage opening 3, counter-knives 23 are provided along which the movable knife 5 moves. The counter-knives 23 stop the object 4 to be cut, while teeth 8, 9 of the knife 5 penetrate and cut the object 4 to be cut.

Figures 2 and 3 show a preferred embodiment of the knife 5, comprising a carrier 7, at least one pair of long teeth 8 extending from the carrier 7, and wherein at least one short tooth 9 is arranged between each pair of long teeth 8.

In the preferred embodiment shown, the carrier 7 is elongated, wherein a plurality of pairs of long teeth 8 extend substantially transversely from the carrier 7 and wherein at least one short tooth 9 is arranged between a plurality of the plurality of pairs of long teeth 8.

Because a space 10 between a pair of long teeth 8 decreases away from the carrier 7, several advantages arise. The long teeth 8 widen away from the carrier 7, so that the space 10, i.e. the mutual distance, between two adjacent long teeth 8 near an end 11 of the long teeth 8 remote from the carrier 7 has a minimal value. An advantage hereof is on the one hand that a relatively wide penetration surface 12 is created, and on the other hand that - precisely due to the widening of the space 10 from the end 11 of the long teeth 8 towards the carrier 7 - space is created where material of the object to be cut 4 can move in the direction of the short teeth 9. Particularly in the case of a cardboard object 4 to be cut, this widening of the gap 10 is very advantageous because it prevents cardboard from moving between the long and short teeth 8, 9. accumulate. Cardboard tends to form a rock-hard accumulation under pressure, the removal of which is difficult and very labor-intensive. A further advantage of an intermediate space 10 increasing from the end of the long teeth 9 towards the carrier 7 is that space is provided for one or more than one short tooth 9 between a pair of long teeth 8.

The short teeth 9 can moreover have a width 14 at an end 13 remote from the carrier 7, which width is at least equal to an interspace 10 between ends 11 remote from the carrier 7 of the corresponding pair of long teeth 8 between which the short tooth 9 is applied. On the one hand, this creates space for the short tooth 9 and on the other hand the end 13 of the short tooth 9 can be sufficiently wide to cut through the material of the object 4 to be cut between two bores 15 provided by a pair of long teeth 8 (Figs. 8 and 12).

If the one or more than one short tooth 9 widens away from the carrier 7, the distance 16 between the end 13 of the short tooth 9 remote from the carrier 7 and the adjacent long tooth 8 is reduced, whereby the cutting of the material of the object 4 to be cut between two bores 15 (Figures 8 and 12) provided by a pair of long teeth 8 is further promoted.

The top view from figure 3 shows that the long teeth 8 are arranged obliquely with respect to a longitudinal direction of the carrier 7 and enclose an angle α of less than 90 °, and that the one or more than one short tooth 9 is also obliquely relative to the longitudinal direction of the carrier 7 is arranged and encloses an angle β of less than 90 °. Preferably, the angle α and the angle β are substantially the same, since the long teeth 8 and short teeth 9 extend substantially parallel to the carrier 7.

During operation, at least the long teeth 8 of the knife 5 are aligned with the direction of movement of the knife 5, which is directed substantially parallel to the wall 2 along the passage opening 3, whereby the long teeth touch the object 4 to be cut one by one. The short teeth 9 are preferably aligned accordingly.

This arrangement ensures that the teeth 8, 9 come into contact with the object 4 one by one, whereby the force with which the knife 5 presses on the object 4 is concentrated in the respective tooth 8, 9 which at that moment is in engagement with the object 4. object 4 is coming.

On the basis of the top views shown in figures 4-9, the successive steps of cutting through an object 4 with the knife 5 from figures 2 and 3 are now further elucidated, whereby the advantage of an inclined position of the teeth 8, 9 is also further explained. relative to the carrier 7. It is noted that the counter knife 23, which holds back the object 4 to be cut, is not shown in Figures 4-9.

In Figure 4, a knife 5 approaches an object 4 to be cut. Figure 5 shows the condition that the leftmost long tooth 8 shown in the figure with its end 11 already penetrates the object 4 somewhat, and that the next long tooth 8 already abuts against the surface of the object 4. The teeth 8, 9 come into contact with the object 4 one by one through an oblique arrangement with respect to the longitudinal direction of the carrier 7 when they approach the object 4 substantially perpendicularly. The carrier 7 is in that case slightly inclined with respect to the direction of movement of the knife 5. Figure 10 shows a view of the object 4 to be cut in the step shown in Figure 4.

Figure 6 shows a slightly further step, in which the two longest teeth 8 on the left in the figure have already been inserted through the object 4, the third long tooth 8 penetrates the object 4, and the fourth long tooth 8 already abuts against the object 4.

In Figure 7, a total of eleven teeth penetrated the object 4 and made a doo bore 15 in it. Figure 11 shows a corresponding view of the object 4, in which the bores 15 are visible. In Figure 7, the object 4 almost comes into contact with the leftmost short tooth 9 in this figure.

Figure 8 shows that the short left tooth 9 in the figure cuts through the material of the object 4, which is located between two bores 15 arranged in the object by a pair of long teeth 8. Figure 12 shows a view of the object 4 to be cut in the step shown in Figure 8.

The perspective view of Figure 2 shows that the long teeth 8 decrease in thickness away from the carrier 7. This results in an end 11 with a small height, as a result of which this end penetrates the object 4 at a lower force. Moreover, the chamfered long tooth 8 forms a sliding surface for the object 4. For the same reasons, it is advantageous if the one or more than one short tooth 9 decreases in thickness away from the carrier 7.

Near the carrier 7, between the one or more than one short tooth 9 and the neighboring long teeth 8, a sliding surface 17 is provided which decreases in thickness away from the carrier 7 (Figure 9).

This sliding surface 17 forms a guide for the cut-through residual material of the object 4. Figure 13 shows a view of the object 4 to be cut in the step shown in Figure 9, and Figure 14 shows the cut-through object 4.

In the preferred embodiment shown in Figs. 2-9, one or more than one long tooth 8 is provided on a end 11 remote from the carrier 7 with a V-shape 18 forming two penetration points 19. This V-shape 18 has the advantage that the material of the object 4 for locating the bore 15 is first engaged by the two penetration points 19 and is engaged by the V-shape 18 via an oblique surface 20 towards the center of the tooth 8 conducts. As a result, the material of the object 4 is led away from the gap 10 between the long teeth 8.

According to a further and alternative preferred embodiment, one or more than one long tooth 8 on an end 11 remote from the carrier 7 is provided with an inverted V-shape 21 which forms one penetration point 22. This alternative preferred embodiment is shown in Figures 15 and 16, and is further identical to the embodiment shown in Figures 2-9.

The embodiments described above, although showing preferred embodiments of the invention, are only intended to illustrate the present invention and not to limit the description of the invention in any way.

It is noted that the object 4 to be cut is shown as a relatively thin and single strip for the sake of the example. However, the teeth 8, 9 of the knife are suitable for cutting through several layers of cardboard, in which case the object 4 shown can be seen as the outer layer.

When measures in the claims are followed by reference numerals, such reference numerals only serve to contribute to the understanding of the claims, but are in no way limiting the scope of protection. In particular, it is noted that a person skilled in the art can combine technical measures of the various embodiments. The rights described are defined by the following claims in the scope of which many modifications are conceivable.

Claims (17)

Conclusions A knife, comprising: - a carrier; - at least one pair of long teeth extending from the carrier; and - wherein at least one short tooth is arranged between each pair of long teeth. The knife of claim 1, wherein: - the carrier is elongated; a plurality of pairs of long teeth extend substantially transversely from the carrier; and - at least one short tooth is arranged between a plurality of the plurality of pairs of long teeth. 3. Blade according to claim 1 or 2, wherein a gap between a pair of long teeth decreases away from the carrier. 4. Blade according to one of the preceding claims, wherein the one or more than one short tooth widens away from the carrier. 5. Knife as claimed in claim 3 or 4, wherein the one or more than one short tooth on an end thereof remote from the carrier has a width at least equal to an interspace between ends of the corresponding pair of long teeth remote from the carrier between which the short tooth is fitted. 6. A knife according to any one of the preceding claims, wherein the long teeth enclose an angle α of less than 90 ° with respect to a longitudinal direction of the carrier. 7. A knife according to any one of the preceding claims, wherein the one or more than one short tooth encloses an angle β of less than 90 ° with respect to the longitudinal direction of the carrier. 8. Knife according to claims 6 and 7, wherein the angle a and the angle β are substantially the same. 9. Knife according to one of the preceding claims, wherein the long teeth decrease in thickness away from the carrier. 10. Knife as claimed in any of the foregoing claims, wherein the one or more than one short tooth decreases in thickness away from the carrier. A knife according to any one of the preceding claims, wherein a sliding surface is provided between the one or more than one short tooth and the adjacent long teeth, a sliding surface which decreases in thickness away from the carrier. A knife according to any one of the preceding claims, wherein one or more than one long tooth is provided at a end remote from the carrier with a V-shape that forms two penetration points. The blade of any one of claims 1 to 11, wherein one or more than one long tooth is provided at an end remote from the carrier with an inverted V shape that forms one penetration point. 14. Cutting device, comprising: - a wall with a passage opening which is adapted for passing through an object to be cut through; and - a knife movable substantially parallel to the wall along the passage opening according to any one of the preceding claims. Cutting device as claimed in claim 14, wherein the passage opening is at least partially free during a stroke of the movable knife along the passage opening. Cutting device as claimed in claim 14 or 15, wherein the wall forms part of a housing, wherein the housing accommodates the movable knife during its complete stroke. A cutting device according to any one of claims 14-16, wherein at least the long teeth of the knife are aligned with the direction of movement of the knife which is oriented substantially parallel to the wall along the passage opening. / 7 IS ίο 4/7 οι Li -Υ Eb α α o o o o a α α o 7/7 h