EP1495845A2 - Rotary cutting blade - Google Patents

Abstract

The device is assembled of two rotating cutting units (10, 12) positioned opposite each other with their blades (18) meshing. Each of the units (10, 12) is of a conical shape, provided with radial grooves (16) for the accommodation of the blades (18) at their outer ends. The blades (18) have convex outer surfaces (22, 24) exceeding the outer contours of the unit (10, 12) serving as cutting edges and adjustable in length if required. Rectangular recesses (26) located between each pair of blades (18) can be used for the removal of shavings.

Description

The present invention relates to a rotary cutting blade for Cutting printed products, with a blade carrier on the Outer circumference blades are arranged so that essentially only one Cutting edge of the blades over the outer circumference of the blade carrier protrudes.

From DE 37 19 721 C3 such a cutting blade is known, the has proven very successful in practice. Dive into this cutting knife the individual blades into the cutting plane of the blade carrier, so that a uniform cutting surface is formed. Because the blades in their Recesses are held displaceable, the blades can to Regrind the blade radially outward several times be, whereupon a surface grinding can take place in the cutting plane. After the grinding process, there is no readjustment of the individual blades more required.

Another advantage of this known rotary cutting knife is in that essentially only one cutting edge of the blades over the Projecting outside circumference of the blade carrier. In other words, those are Blades in the blade carrier fixed so that they are essentially only with its cutting edge, but not beyond the outer circumference protrude from the blade carrier. This causes a high degree of smoothness, as the Blades through their embedding in the blade carrier during the cutting process can not swing. Comparable benefits are at a Embodiment achieved in which the blade carrier in a substantially disk-shaped main body is inserted ring, with which the Blades are integrally connected.

The above mentioned rotary cutting knives have been used proven in many ways, however, the thickness of these knives limited to printed products.

It is the object of the present invention to provide a rotary cutting knife of the aforementioned type so that printed products can be cut clean with a relatively large thickness, For example, product catalogs, directories and the like.

The solution of the above object is achieved by the features of Claim 1 and in a rotary cutting knife of the aforementioned Type in particular in that each blade has a convex curved Having cutting edge and that the blade carrier at his Outer circumference between each two adjacent blades a recess having.

The rotary cutting knives according to the invention can be stacked in pairs be arranged so that the front sides of the two Cutting knife lie within a common cutting plane, wherein the blades of one knife with the blades of the other knife comb. Due to the inventively provided recesses between two adjacent blades while the blades of the one Knife with its foremost end in the recesses of the other Protrude into the knife. In this way it is possible both cutting blades extremely close to each other to arrange or the blades strong overlap, resulting in a cleaner, smoother overall Cut results even if printed products or a scale flow cut from printed products with a comparatively large thickness be, for example, directories, mail order catalogs or the like.

Since the rotary cutting blade according to the invention blades with convex Curved cutting edge is also thicker when cutting Printed products ensure that the blades at all times make a pulling cut, without the blades with a Chop corner in not yet cut areas of the product.

The recesses provided on the outer circumference of the blade carrier In addition, between two adjacent blades can be used as chip space serve to create a cropping of a printed product To pick up a chip or favor its training.

Advantageous embodiments of the invention are described in the description, the drawing and the dependent claims.

According to a first advantageous embodiment, the blade carrier be a substantially conical body, being on a curved Conical surface of the blade carrier elongated recesses provided may be in which the blades are slidably mounted. in this connection The recess may extend from the conical surface of the blade carrier to a cutting surface forming a front surface of the blade carrier extend so that the recess completely removes the blade carrier from penetrates its front to its back. Such Recess is relatively easy to manufacture and ensures that the Blades of one knife contactlessly into the recesses of the other Dipping knife.

According to a further advantageous embodiment of the invention can the blade carrier in a particular disc-like body inserted ring, with which the blades are integrally connected, the recesses between the blades at least on the ring are formed. In this embodiment, the individual blades Although not solved by the blade carrier, moved and then reground, but arise in terms of cut quality the same advantages as in the first described embodiment.

According to a further advantageous embodiment of the invention is to provided on both sides of the recess a web, leading to the guide and Stabilization of each adjacent blade is used. This ensures that the blade supported as large as possible on their sides is, whereby an undesirable swinging of the blades is avoided.

A particularly advantageous cutting edge geometry in two within a cutting plane meshing rotary cutting knives results, if each blade with a face coplanar to the cutting surface forming front surface of the blade carrier is arranged, wherein the blades on the opposite sides of the surface convex curved are.

The attachment of the blades in the blade carrier is carried out according to an advantageous Embodiment such that at least one radially inner end a cutting edge immediately adjacent to the blade carrier. To this Way, it is ensured that the blades only as far as absolutely necessary protrude from the blade carrier. If the blades are opposite one Radius are arranged at an angle, a second cutting edge the blade slightly from the outer periphery of the blade carrier spaced ends.

According to a further advantageous embodiment, the blades of the Rotary cutter two convex curved cutting edges, the especially constantly merge into each other. In this embodiment First, make sure the blade is in the over the outer circumference the blade support projecting area no sharp edges or Has corners that could hack into a product to be cut or unwanted in the area of an already cut product Could leave a cut marks. On the other hand, such can be Make embodiment particularly easy.

It is advantageous in this context, when the blade in the blade carrier is attached so that the convexly curved cutting edge with its radially inner end directly adjacent to the blade carrier, since This ensures the best possible attachment of the blade in the blade carrier is given, which prevents a swinging of the blade.

Suitable for equipping the rotary cutting knife according to the invention especially a blade, which consists of an elongated body with rectangular cross-section, since the blade thereby a particularly good grip in the complementary recess of the Blade carrier finds. The main body of the blade is at its front End provided with one or two cutting edges, which curved slightly convex are, at all times a constant, pulling To achieve a cut. When doing the curved cutting edge on a planar side wall of the blade ends, is a particularly high stability and stability of the cutting edge guaranteed. Again, it can be advantageous to provide two curved cutting edges, the symmetrical are arranged to a central axis of the blade, as a result of the Blades can be used in two directions.

According to a further aspect, the invention relates to a cutting device, in the two similar rotary cutting blade of the above described type synchronously driven and arranged one above the other are the blades of a knife between the blades of the other Combing knife, both knives with their front inside the same cutting plane are arranged and the front end of each blade a cutting knife in the recesses of the other cutting blade penetrates. With such an arrangement can also be comparatively thick scale flows or printed products, such as catalogs, telephone directories and the like, cut properly. Because the front end each blade of a cutting knife into the recesses of the other Cutting knife penetrates, there is a large overlap between the two cutting knives, but the blades are not far, but only with their cutting edges on the outer circumference of the blade carrier in front. With such an arrangement is a very stable cutting device created, with the extremely thick printed products can be cut very clean, without causing it to be undesirable Vibrations come, which would negatively affect the cut.

According to an advantageous embodiment of the invention Cutting device, the two cutting blades can be arranged on shafts be coupled on the one hand by means of a belt or a chain on the other hand, each having a gear, wherein the mesh with both gears. In this embodiment the synchronous drive of the two cutting knives takes place with the help of the Belt, for example, a toothed belt, wherein the two gears comb each other, but in normal operation do not touch each other. If it is due to a malfunction or a tear of the belt the drive chain comes, engage the two gears touching each other a, so that a forced coupling of the cutting blade ensures is. In this way, a breakage of the blades can be prevented because synonymous with a broken drive belt synchronous movement of the Cutting knife is guaranteed.

According to another embodiment, at least one of the two Cutting knife be mounted axially displaceable in the cutting device. This makes it possible in a simple manner, an exact alignment of the to both cutting blades within one and the same cutting plane guarantee.

According to a further advantageous embodiment, the cutting device a block-like housing, in particular a drive for the two cutting blades is also attached to the housing. Through this Embodiment is given an extremely compact cutting module, the a edge or side trim of a scale flow of printed products can perform. Such a cutting module can either in a cutting machine or even within a stacker, in Area of a conveyor line or other locations of the press be arranged next Schuppenstromes.

According to a further advantageous embodiment, the cutting device have a device for height adjustment. hereby the cutting device can be printed on printed products with different Thickness to be adjusted. It may also be advantageous if the housing the cutting device pivotally mounted on a base member is stored, as a result, the entire cutting module folded out so That can be a simple assembly or maintenance of the cutting blade is possible.

In the following, the present invention will be described purely by way of example advantageous embodiments and with reference to the attached Drawings described.

Fig. 1

eine Seitenansicht einer Schneidvorrichtung mit zwei kämmenden Rotationsschneidmessern;

Fig. 2a - d

Ansichten einer Klinge für ein Schneidmesser nach Fig. 1; und

Fig. 3

eine perspektivische Ansicht einer Schneidvorrichtung mit zwei kämmenden Rotationsschneidmessern.

Show it:

Fig. 1

a side view of a cutting device with two intermeshing rotary cutting knives;

Fig. 2a - d

Views of a blade for a cutting blade of Fig. 1; and

Fig. 3

a perspective view of a cutting device with two intermeshing rotary cutting knives.

Fig. 1 shows the side view of a cutting device with two rotary cutting knives 10 and 12, arranged one above the other and combing are.

Each rotary cutting blade 10, 12 has a blade carrier 14, which is formed as a substantially conical body on whose curved conical surface elongated recesses 16 provided are, in each of which a blade 18 slidably mounted and with the help is attached by two screws 20. Both the blades of the upper Cutting blade 10 as well as the blades of the lower cutting blade 12th are elongated opposite one to the anterior apex of the blade Radius beam R, R 'arranged at an angle. In that regard corresponds the structure of the rotary cutter according to the invention the from DE 37 19 721 A known cutting knives, wherein the Offenbarungsgehalt this patent application by reference expressly is also made the subject of this application. In contrast to the previously known in this patent application prior art blades According to the invention, each blade 18 has a convexly curved cutting edge 24, which directly adjoins the outer circumference of the blade carrier 14 connects, with each blade essentially only with this cutting edge projects beyond the outer periphery of the blade carrier 14.

As shown in FIGS. 1 and 2, the blades 18 are to a symmetry line or central axis M (Fig. 2a) formed symmetrically, so that each blade 18 at its front end two convexly curved cutting edges 22nd and 24, which merge (in the mathematical sense) continuously into each other. In other words, each blade has 18 in its over the outer circumference of the blade carrier 14 projecting area no sharp edges or corners.

Between two adjacent blades 18 are on each blade carrier 14th approximately rectangular recesses 26 in the form of windows in the blade carrier formed in the radial direction to the outer circumference A of the Open the blade carrier 14. Each recess 26 is in the circumferential direction of two webs 28 and 30 limited, which integral with the blade carrier 14th are connected and substantially parallel to each adjacent Blade 18 is lost. As a result, each recess 26 in the circumferential direction of two substantially radially extending web portions 32 and 34 bounded over a substantially circumferential direction extending edge portion 36 are interconnected. hereby In plan view, approximately square recesses 26 are formed. It was However, it should be noted that the transition between the web sections 32, 34 and the edge portion 36 is also rounded can be, resulting in a simplified production and improved Chip removal leads.

The space formed by the recess 26 between the two web portions Namely, 32 and 34 can simultaneously serve as chip space, in a chip at least partially by the open in the radial direction Side on the outer circumference A of the blade carrier 14 can penetrate. The Width of the chip space or the recess 26 corresponds substantially the width of a blade 18 and a recess 16, respectively.

The blades 18 for the cutting blades 10 and 12 shown in FIG are shown in more detail in FIGS. 2a-d. FIG. 2a shows one of the FIGS. 1 corresponding top view of the top of the blade 18th Fig. 2b shows a side view, Fig. 2c is a plan view of the bottom and Fig. 2d a front view of the blade 18. The shape of the main body of the blade FIG. 18 of FIG. 2 differs from the blades shown in FIG. 1 are shown as the blades shown in Fig. 1 at its rear side are formed tapered, which is not the case with the blade of Fig. 2.

As shown in FIGS. 2a-d, each blade 18 consists of one substantially rectangular body with flat, rectangular cross section, wherein in the base body arranged on a central axis M Slot provided for fixing the blades by means of screws 20 is.

At its front end, the blade 18, the two slightly convex curved cutting edges 22, 24, both with their radially inner End each at a planar side wall 40, 42 of the blade end. Both Cutting edges 22 and 24 are symmetrical to the central axis M of the blade 18 arranged. On the recognizable in Fig. 2c back of the blade are the two cutting edges 22 and 24 of a planar part surface 46th limited in the installed state of the blade coplanar to the the Cutting surface forming front surface of the blade carrier runs. As Fig. 2b, the partial surface 46 extends at an angle to the longitudinal axis of the Blade corresponding to the cone angle of the blade carrier 14. On the the face 46 opposite side of the blade 18 is another Partial surface 48 is provided, which is convexly curved in cross section (see. Fig. 2d) and from the one side surface 42 to the other side surface 40 extends. In the side view according to FIG. 2b, however, the blade 18 at its front end both a part of the planar side wall 42nd as well as a part of the curved part surface 48.

As shown in FIG. 1, the blades 18 are compared to a radius R, R 'of Blade carrier arranged inclined on the curved conical surface. simultaneously stand the blades 18 only so far on the outer circumference A of Blade carrier 14 before that the cutting edges 24 directly to the Blade support 14 adjacent.

The two rotary cutting knives 10 and 12 shown in FIG. 1 are driven in a cutting device synchronously in the arrow direction and one above the other so arranged that the flat front sides of the two Rotary cutting knife both lie in the same cutting plane and that the blades 18 of a knife between the blades of the other Comb knife. The mutual distance between the two rotary cutting knives 10 and 12 is chosen so that the blades 18 of a Knife with its foremost ends in the recesses 26 of the other Immerse the knife. The recesses 26 thus have a double function, on the one hand form a chip space and on the other hand a small spacing and large coverage of the two rotary cutting knives enable.

The cutting device shown in Fig. 1 can be not only in the Operate turning sense, as indicated by the two arrows. Much more is also possible to operate in the reverse direction of rotation. Important is only that both blades rotate synchronously, usually the Rotational speed of the blades is greater than the speed, with the printed products, for example, in imbricated formation, between be passed through the rotating rotary cutting knives.

Apart from the described embodiment are very different Modifications of the rotary cutting blade according to the invention or the blades possible. So it is not necessary that the blades with two cutting edges are equipped. Also, the blades can be one-piece be connected to an annular blade carrier.

With the rotary cutting knives according to the invention can be in a smooth, clean and pulling cut extremely thick Cutting printed products, such as directories, mail order catalogs or the like having a product thickness in the range of several centimeters. This creates an exceptionally clean cut, without unwanted marks in the cutting area.

Fig. 3 shows a perspective view of a cutting device 50 with two rotary cutting blades 10, 12, as shown in Fig. 1, arranged so are that the blades 18 of a knife 10 between the Blades 18 of the other knife 12 comb, the blades 18 of a Knife 10 with its front end in the recesses 26 of the other Immerse knife 12. Both knives 10 and 12 have a common Cutting plane and are stored in a block-like housing 52, which is composed of a total of four housing plates. each Cutting knife 10, 12 is mounted at one end of a shaft, which in a Shaft bearing 54, 56 which is mounted within the housing 52 is. At the other end of each shaft is a respective gear 58, 60th fastened, wherein the two gears 58 and 60 mesh with each other. in the Connection to the gears 58 and 60 is at the extreme end of the shafts in each case a drive wheel 62, 64 arranged so that the two shafts over a timing belt (not shown) can be moved synchronously. At the free end of the lower shaft in Fig. 3 is also a drive wheel 66 provided with the help of the two cutting blades over a another drive belt from a (not shown) drive motor are driven. Here, the drive motor is also with the housing 52 firmly connected.

As shown in Fig. 3, the shaft bearing 54 of the upper shaft via a dovetail guide 68 slidably mounted in the axial direction, so that the both cutting blades 10 and 12 in a simple manner within and the same cutting plane can be aligned.

Furthermore, Fig. 3 shows that the housing 52 of the cutting device 50 via two spherical plain bearings 70, 72 are pivotably mounted on a base part 74, so that the cutting device 50 (in Fig. 3) in the direction S about the axis X can be tilted backwards for easy access to the Cutting knives 10 and 12 to allow. The base part 74 is on a Attached (not shown) device for height adjustment, so that also a vertical height adjustment of the cutting device to simple Way is possible.

In normal operation, the drive of the two cutting blades 10 and 12 takes place via the drive motor (not shown) by means of a drive belt, which transmits the driving force to the drive wheel 66. Because the both shafts synchronized with each other via the toothed belt (not shown) are driven, the two drive wheels 62 and 64 with each other connects, the blades 18 of the two cutting blades 10 and 12 mesh with each other in the manner shown in Fig. 1 and in engage the recesses 26 of the other knife without that a contact between the two rotary cutting knives takes place. The gears 58 and 60, which are arranged on the two cutter shafts are, comb in normal operation, but touch each other the teeth of the two gears 58 and 60 are not. However, if the the two toothed belts 62 and 64 should tear connecting toothed belts, a contact of the teeth of the gears 58 and 60, the only one have low clearance, so that the two rotary cutting knives 10th and 12 are still forced. Because the game is in the circumferential direction between the teeth of the gears 58 and 60 is smaller than that Play between the intermeshing cutting blades 10 and 12, is guaranteed in the event of a belt break that no contact the two cutting blades 10 and 12 takes place, so that a destruction of the Blades are also excluded in this case.

The cutting device shown in Fig. 3 represents an extremely compact and powerful cutting module, the most diverse Jobs can be used in the field of post-processing. There the axes of the two rotary cutting knives 10 and 12 are vertically aligned, i.e. are arranged on a normal, is a symmetrical Structure, which are easily integrated into existing plants can.

LIST OF REFERENCE NUMBERS

10, 12

Rotary cutting blade

14

blade carrier

16

recess

18

blade

20

screw

22, 24

cutting edge

26

recess

28, 30

web

32, 34

web sections

36

edge section

40, 42

planar side surface

46

planar partial surface

48

convex part surface

50

cutter

52

casing

54, 56

shaft bearing

58.60

gear

62, 64, 66

drive wheel

68

guide

70, 72

Spherical plain bearings

74

base

A

outer periphery

M

central axis

S

pan direction

X

swivel axis

Claims (17)

Rotary cutting knife (10, 12) for cutting printed products, comprising a blade carrier (14), on the outer periphery of which blades (18) are arranged such that substantially only one cutting edge (24) of the blades (18) extends beyond the outer circumference (A) of the blade Blade carrier (14) protrudes,
characterized in that
the cutting edge (24) of the blades (18) is convexly curved; and that on the outer periphery (A) of the blade carrier between each two adjacent blades (18) has a recess (26) is provided. Rotary cutting blade according to claim 1,
characterized in that
the blade carrier (14) is a substantially conical base body and elongated recesses (16) are provided on a curved conical surface of the blade carrier (14), in which the blades (18) are displaceably mounted. Rotary cutting blade according to claim 1,
characterized in that
the blade carrier is a ring inserted in a base body, with which the blades are integrally connected, wherein the recess is formed at least on the ring. Rotary cutting blade according to claim 2,
characterized in that
the recess (26) extends from the conical surface to a front surface of the blade carrier (14) forming a cutting surface. Rotary cutting blade according to claim at least one of the preceding claims,
characterized in that
the recess (26) is a window in the blade carrier (14) open towards the periphery of the blade carrier. Rotary cutting blade according to at least one of the preceding claims,
characterized in that
on both sides of the recess (16) has a web (28, 30) is provided which serves to guide an adjacent blade (18). Rotary cutting blade according to at least one of the preceding claims,
characterized in that
the blade (18) with a partial surface (46) is coplanar with a cutting surface forming front surface of the blade carrier (14), and that the blade (18) is convexly curved on the side (48) opposite the partial surface (46). Rotary cutting blade according to at least one of the preceding claims,
characterized in that
the blades (18) are disposed in the blade carrier (14) so that a radially inner end of the cutting edge (24) directly adjoins the blade carrier (14). Blade for a rotary cutting blade according to claim 1, consisting from an elongate basic body with a rectangular cross section, wherein the main body at its front end with a Cutting edge (22, 24) which is slightly convexly curved, the curved cutting edge being on a planar sidewall (40, 42) the blade ends. Blade according to claim 9,
characterized in that
two convexly curved cutting edges (22, 24) are arranged symmetrically to a central axis (M) of the blade (18). Blade according to claim 9 or 10,
characterized in that
two curved cutting edges (22, 24) are provided, which merge into one another continuously. Cutting device (50) with two rotary cutting knives (10, 12) according to at least one of claims 1 to 8, which is a common Have cutting plane, wherein the cutting blades (10, 12) synchronously are driven and arranged one above the other so that the Blades (18) of a knife (10, 12) between the blades (18) of the blade combing other knife (12, 10), wherein the blades (18) of a Knife (10, 12) with its front end in the recesses (26) of the other knife (12, 10). Device according to claim 12,
characterized in that
the two cutting blades (10, 12) are arranged on shafts, which are coupled on the one hand by means of a belt or a chain and on the other hand each have a gear (58, 60), wherein the two gears mesh with each other. Device according to claim 12 or 13,
characterized in that
at least one of the two cutting blades (10) is mounted axially displaceable. Device according to at least one of claims 12 to 14,
characterized in that
this has a block-like housing (52), wherein in particular a drive for the two cutting blades (10, 12) on the housing (52) is attached. Device according to at least one of claims 12 to 15,
characterized in that
this has a device for height adjustment. Device according to at least one of claims 12 to 16,
characterized in that
this has a housing (52) which is pivotally mounted on a base member (74).

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