EP2127860A1 - Device for creating a crease line - Google Patents

Abstract

The device (1) has two circular grooving elements rotating and moving in opposite directions around parallel axles, where a single-laminated or multi-laminated sheet runs to an annular gap between the grooving elements. One of the grooving elements is designed as a grooving knife (5) with a boundary region (11) and other grooving organ is designed as a grooving ambo (6). The grooving knife is formed by measuring edges (13) of a separating intermediate gap (12), where the measuring edges are arranged at a distance in the boundary region and are formed in a pointed-angular manner.

Description

The invention relates to a device for forming a groove at one an annular gap between two counter-rotating about parallel axes, circular furrows continuous mono- or multi-sheet sheet or a web of paper, plastic or metal, wherein a creasing member as a creasing knife with a circumferentially out first similar tapered edge region and the opposing creasing member is designed as Rillambos.

Devices of this kind convey, for example, the EP 0'627'303 A1 , the WO 2004/073966 A1 and the EP 1'845'046 A1 ,

From the EP 0'627'303 A1 a rotary embossing device is known, which has for continuously grooving carton blanks two mutually rotating cylinders, between which a carton blank is clamped and conveyed. One of the cylinders has a radially projecting embossing profile on the circumference, which reduces the cross section with increasing diameter by means of one or more phases. The second cylinder has a circumferential groove corresponding to the embossing profile of the first Cylinder faces. The embossing device mentioned is suitable for thicker products, but not for thin products such as covers of magazines or other printed products.

In the WO 2004/073966 A1 discloses a system in which flat materials can be grooved and / or perforated by applying strips to a drum rotating about a first axis. A wheel rotating about a second axis has one or more grooves in which the strips projecting from the cylindrical surface of the drum engage. The first and second axes are parallel to each other. Several strips that are releasably attached to the drum may differ in material, structure and geometry. If the strips are made of a plastic as described, they are subject to great wear and must be replaced regularly with new ones. In order to obtain an optimum groove or perforation on the flat materials to be processed, the strips must be attached very precisely to the circumference of the drum both in the axial and in the radial direction, which can be very time-consuming and expensive.

Different grades and grades of materials, such as unprinted or printed sheets, sheets or foils, also lead to diverse handling behaviors. Thus, it is known that delicate sheets tend to crack or break when folded along the deformation caused by grooves, especially when individual sheets are used as envelopes for books, brochures or the like. By grooving the material is displaced and / or compressed. This gives the materials to be rilled or

Bow a hinge-like bend. If the contact pressure of the scoring wheel is too high, the sheets or the web are severed completely or partially. If the contact pressure is too low, the rebate may deviate from the intended bend after grooving. There are known creasing devices in which the curvature produced by the creasing wheel, also called the ridged ridge, comes to lie either outside (positive creasing) or inside (negative creasing) between the legs of the folded crease after the subsequent creasing. In order to be able to process the widest possible range of sheets, scoring devices are known which can be set up or converted for positive and negative scorings.

The object of the invention is to provide a device according to the aforementioned type, with which the grooves sensitive sheet can be performed easily and gently.

According to the invention, this object is achieved in that the circumference of the scoring blade is formed by a gap separating the edge region into two spaced knife edges. The grooves formed by the two Rillmessern can be so close to each other that after grooving or after folding for the eye gives the impression that it is a groove groove produced with a single Rillmesser.

Advantageously, the knife edges are formed at an acute angle, so that an exact creasing process can be performed.

Preferably, the acute angle of the knife edges is achieved in that the first-like tapered edge region is formed by a gap.

The gap may be formed by a groove whose side surfaces are aligned parallel to each other and perpendicular to the axes.

The two knife edges can each be rounded off with a radius so that the material is gently compacted and / or displaced.

To further influence the Rilloberfläche the Rillambos may have a groove facing the groove.

The recess can be designed to receive an insert, which is made for example of an elastic material.

It is also conceivable that a ring cooperating with the scoring wheel is applied to the cylindrical outer surface of the Rillambos.

The scoring wheel is preferably mounted on a jockey wheel, which, as shown in EP 1'845'046 A1, is pressed by an adjustable force against the Rillambos. The distance between the two knife edges of the scoring wheel to Rillambos is kept constant regardless of the runout of the Rillambos by the feeler wheel. This ensures that the depth of a groove created by the scoring wheel in an arc remains constant, regardless of the thickness of the sheet. Will the scoring wheel also, As shown in EP 1'845'040 A1, connected via an eccentric connection with the jockey wheel, the groove depth can be adjusted very easily by turning the connection. An adjustment is necessary only when changing from very thin to very thick sheet or multilayer materials and vice versa.

When a sheet is folded along the deformation produced by the scoring wheel according to the invention, the fibers of a sheet are bent by approximately 90 ° for each of the two closely spaced grooves. In a prior art creasing knife with a single knife edge, the bow legs deflected by about 180 ° are significantly more likely to crack or break. This unexpected and surprising effect of the two spaced apart by a gap knife edges makes the inventive scoring device in terms of setting the groove depth and contact pressure very tolerant and user-friendly.

According to a development of the invention, the scoring wheel can be formed in two or more parts. Thus, the axial distance between the lateral surfaces of the groove or between the knife edges can be adjusted and processed an even wider range of products.

The scoring device according to the invention can preferably be used in a folder feeder of a saddle stitcher. In this case, unfolded sheets, in particular dust covers, are removed from a stack and fed by means of a device to the creasing or the folding device and then to a on a saddle astride transported stack of sheets placed.

Furthermore, the device according to the invention can be used, for example, for producing a plurality of grooves in envelopes for adhesive-bonded printed products. In this case, usually two grooves for the exact alignment of the bending points on the back of the adhesive-bound printed products or one or more ornamental grooves for opening the envelope are produced on a book. The envelopes go through on the way to the separation of a held in an adhesive binder book block on a transport device evenly resting one or more creasing devices.

In one embodiment of the invention, a lying flat on a table envelope can be grooved, in which a creasing knife is moved over the stationary bow. The table forms the Rillambos, which has an elastic insert at least in the area where the Rillmesser can make grooves.

Fig.1a

eine schematische Darstellung einer Rillvorrichtung in einem Falzanleger nach dem Stand der Technik,

Fig. 1b

eine schematische Darstellung einer Rillvorrichtung in einer Buchbindemaschine nach dem Stand der Technik,

Fig. 2

einen Querschnitt einer erfindungsgemässen Vorrichtung,

Fig. 3

einen Querschnitt einer Variante einer erfindungsgemässen Vorrichtung mit mehrteiligem Rillrad,

Fig. 4a

einen Ausschnitt im Bereich der Messerkanten des Rillrades und des Rillambos gem. Fig. 2,

Fig. 4b

eine Variante gem. Fig. 4a,

Fig. 4c

eine Variante gem. Fig. 4a,

Fig. 4d

eine Variante gem. Fig 4a,

Fig. 5

einen Ausschnitt der Rillvorrichtung gem. Fig. 2 mit einem Druckbogen,

Fig. 6a

den Randbereich eines Rillmessers nach dem Stand der Technik mit einem Druckbogen,

Fig. 6b

den Druckbogen gem. Fig. 6a nach dem Falzen entlang der Rillung,

Fig. 7a

den Randbereich eines erfindungsgemässen Rillmessers mit einem Druckbogen,

Fig. 7b

den Druckbogen gem. Fig. 7a nach dem Falzen entlang der Rillung.

In the following, the proposed device will be explained with reference to the drawings, to which reference is made with respect to all details not mentioned in the description, by means of an embodiment. In the drawing show:

1a

a schematic representation of a scoring device in a folding feeder according to the prior art,

Fig. 1b

a schematic representation of a scoring device in a bookbinding machine according to the prior art,

Fig. 2

a cross section of an inventive device,

Fig. 3

a cross section of a variant of an inventive device with multi-part scoring wheel,

Fig. 4a

a section in the area of the knife edges of the scoring wheel and the Rillambos gem. Fig. 2 .

Fig. 4b

a variant gem. Fig. 4a .

Fig. 4c

a variant gem. Fig. 4a .

Fig. 4d

a variant gem. Fig. 4a .

Fig. 5

a section of the scoring device acc. Fig. 2 with a printed sheet,

Fig. 6a

the edge region of a prior art grooving knife with a print sheet,

Fig. 6b

the printed sheet acc. Fig. 6a after folding along the groove,

Fig. 7a

the edge region of a curving knife according to the invention with a printed sheet,

Fig. 7b

the printed sheet acc. Fig. 7a after folding along the crease.

The FIGS. 1a and 1b show schematically a device 1 or 1 'for the grooving of single or multi - leaf sheets or a web of paper, plastic or metal. Hereinafter, these various printed or unprinted products and materials will be referred to as Envelope 2. The device 1, 1 'is formed by at least two parallel axes 3, 4 rotating scoring organs. A first creasing member is designed as Rillmesser 5, a second as Rillambos 6. In Fig. 1a an envelope 2 is shown, which is withdrawn from a stack, not shown, and is transported by a connected to the shaft 8 drum 7 in a clockwise direction. The drum 7 consists of at least two spaced-apart drum discs, which have at least one respective gripper 9 for holding the envelopes 2 on its circumference. The Rillambos 6 may be part of a drum disc or secured between them on the shaft 8. It is advantageous if the drum disc and the Rillambos 6 have at least approximately the same diameter. The envelope 2 is grooved during transport between the annular gap formed by the Rillambos 6 and the Rillmesser 5. The construction of a folder feeder with a folding device, to which the grooved envelopes 2 are fed, is shown in EP 1'845'046 A1.

It is also conceivable that the Rillmesser has a diameter which is approximately equal to the size of the two drum discs, and that the Rillmesser example between The drum discs is mounted on the shaft 8 so that it can be driven around the axis 4. Accordingly, the Rillambos can have a smaller diameter and be acted upon with an adjustable spring force against the Rillmesser.

In Fig. 1b schematically the device 1 'for the grooves on a conveyor 10 flat lying envelopes 2 are shown, as they come for example in perfect binder systems used. In this case, in a known manner, the envelopes 2 are separated from a stack, not shown, or cut directly from a web, grooved, folded and fed to the back of an adhesive provided with Buck block. It is common that two or more pairs, consisting of Rillambos 6 and Rillmesser 5 the envelope 2 groove so that a plurality of spaced-apart and mutually parallel grooves are generated. The Rillmesser 8 is as in Fig. 1b shown above and the Rillambos 6 arranged below the plane on which the envelopes 2 are transported. It is also conceivable that the positions of individual or all creasing organs are interchanged in pairs.

The Rillmesser 5 has a circumferentially tapered edge portion 11, as he, for example, in FIG. 2 is shown. A gap 12 separates the edge region 11 into two spaced-apart knife edges 13. The knife edges 13 are formed at an acute angle and have an axial distance of 0.2 to 1 mm from each other. Preferably, they have a distance of 0.4 to 0.6mm. The intermediate space 12 may be formed by a circumferential groove 11 in the edge region 14 so that the two lateral surfaces 15 of the groove 14 parallel to each other and are aligned perpendicular to the axis 3. The depth of the groove 14 corresponds at least approximately to its width. Advantageously, a groove 14 is formed with a depth of 1 mm or more. It is also conceivable that the groove 14 is so deep that the Rillmesser 5 as in Fig. 3 shown, is formed in two parts, wherein the two blade parts 16, 17 each have one of the two blade edges 13. By moving one or both knife parts 16, 17 in the axial direction, the distance between the knife edges 13 can be changed. With a fastening element 33, for example, the blade part 16 can be fixed in the axial direction.

The single- or multi-piece scoring blade 5 is rotatably mounted on an eccentric sleeve 20 which is fixedly connected to a stationary shaft 21. A jockey wheel 18 mounted rotatably about an axis 19 next to the creasing blade 5 on the shaft 21 is, as described in EP 1'845'046 A1, pressed against the caterpillar with a variable spring force. It is advantageous if the diameter of the Rillrades 5 is at least equal to or greater than the diameter of the Tastrades 18. By rotating the shaft 21 can be through the eccentric connection between the scoring knife 5 and Tastrad 18, the distance between the knife edges 13 of the Rillmessers 5 and the Rillambos 6 can be changed or adjusted.

It is also conceivable that the distance of the axis 4 of the Rillambos and the axis 3 of the Rillrades is adjusted, for example via a thread, so that it can be dispensed with a Tastrad and the necessary elements. The connection between the creasing members may be rigid or spring-loaded.

In the FIGS. 4a to 4d is an enlarged section of Fig. 2 shown. They each show the edge region 11 of the scoring blade 5 with the two knife edges 13 and the Rillambos. 6 Fig. 4a shows a Rillambos 6, which has a continuous cylindrical surface 22 in the region of the Rillmessers 5 and the knife edge 13. In Fig. 4b has the Rillambos 6 on the periphery of the creasing blade 5 facing recess 23. An envelope, which is passed between the creasing organs, can be pressed by the knife edges 13 into the recess 23.

Preferably, according to Fig. 4c in the recess 23, a liner 24 is inserted, which supports the envelope 2 during the creasing of the side facing away from the creasing wheel. It is particularly advantageous if the insert 24 is designed to be elastic at least in the radial direction. Through the insert 24 receive the envelopes 2 a groove 26 in the form, as they are for example in Fig. 5 or 7a shown and described below. By rotating the shaft 21 and the associated sleeve 20, the groove depth can be adjusted. That is, it can optionally be set how much the envelope 2 is pressed by the knife edges 13 in the insert 24 of the Rillambos or how much the envelope 2 is to be deformed and / or compressed.

It is envisaged that the insert 24 can be exchanged for adaptation to different envelopes 2 or as a result of wear and tear. With inserts 24 made of various plastics or rubber compounds, the different properties of the envelopes 2 may be taken into account, if necessary, and an optimum creasing result may also be considered 2 can be achieved with very sensitive envelopes. For easy replacement of the inserts 24, for example, they can be provided on their backs with a releasable adhesive or at least partially magnetic.

If the insert 24 is too hard or if the contact pressure of the scoring blade 5 is too strong with respect to the rillambos 6, the envelopes 2 can be partially or completely severed, which is not desirable per se. If the insert 24 is too soft or if the pressing force is too low, the corrugated bead 26 is formed too little and the material is not sufficiently compacted at the bending point.

Instead of the recessed into the recess 23 insert 24 is also in the region of the Rillmessers 5 as in in Fig. 4d illustrated, annular and elastic increase 26 conceivable, which is applied to the surface 22 of the Rillambos.

In Fig. 5 is shown as between the creasing members 5, 6 in the pass an envelope 2 is grooved. The feeler wheel 18 runs in each case on the Rillambos 6 or on the envelope 2, which is pressed by the contact pressure of the Tastrades 18 to the cylindrical surface 22 of the Rillambos 6. The scoring blade 5 rotates passively by the contact of the edge region 11 with the insert 24 or with the envelope 2 about the axis 3.

In FIG. 6a is a section of an edge region 11 'of a scoring blade 5' shown in the prior art. The scoring blade 5 'has on the circumference only one knife edge 13', which cooperates with a facing her deposit 24 of the Rillambos 6. The knife edge 13 'forms an envelope 2' one Rillnut 26 'with a first bend 27', which is influenced by the geometry of the knife edge 13 '. On both sides of the first bend 27 'are formed in each case a further bend 28', which connect the groove groove 26 'with only partially shown legs 29' of the envelope 2 '. The shape of the bends 27 'is influenced by properties of the envelope 2' and by the material of the insert 24 and the contact pressure of the scoring blade 5 'and the groove depth. In a hard insert 24, the bends 27 'receive a relatively small radius.

Will the in Fig. 6a grooved envelope 2 'folded, his back gets, for example, a shape as in Fig. 6b is shown. Envelopes of this type are used, for example, for stapled products. The two legs 29 'are approximately parallel to each other. The fibers in the envelope 2 'are bent at an angle 30 in the bend 28' lying between the bends 27 '. In creases according to the prior art, the angle 30 is approximately 180 °. The stack of sheets to be bound by saddle stitching to the envelope is in Fig. 6a not shown.

Fig. 7a shows the same section as Fig. 6a with an inventive Rillmesser 5. The edge portion 11 of the Rillmessers 2 in two knife edges 13 separating gap 12 is here in contrast to the Fig. 4a to 4d as deep groove or the scoring knife 2 is formed in two parts. The groove groove 26 differs from the in Fig. 6a shown groove groove 26 'characterized in that between the two formed by the knife edges 13 bends 28 caused by the back pressure of the insert 24 additional bend 31 is formed. For example used a very soft insert 24, the additional bend 31 approaches a straight line. In a relatively hard insert 24 this presses the arc deeper into the gap 12 between the knife edge 13 and thus forms the bend 31 with a smaller radius. After folding - as described above - now the fibers of the envelope 2 are bent in the region of the bend 28 by an angle 32. The angle 32 is significantly smaller than that in Fig. 6b shown angle 30, it can be about 90 °. As a result, the fibers are much less likely to break and the envelopes 2 are less susceptible to tearing than prior art creasing.

The geometry according to the invention of the edge region 11 of the creasing knives 2 is not limited to rotating creasing members. Thus, bar-shaped tools can also be formed by known bar grooving machines with two knife edges located close to one another to form a single groove groove 26

Claims (13)

Device for forming a groove on a single or multi-sheet sheet (2) or a web made of paper, plastic or metal passing through an annular gap between two counter-rotating circular grooves on parallel axes (3, 4), a creasing member being a creasing knife (5 1) and the opposing creasing member is designed as a caterpillar (6), characterized in that the circumference of the creasing knife (5) is divided into two spaced knife edges (13) by a peripheral region (11). separating space (12) is formed. Apparatus according to claim 1, characterized in that the intermediate space (12) by a in the edge region (11) of the Rillmessers (5) extending groove (14) is formed. Apparatus according to claim 1 or 2, characterized in that the knife edges (13) are preferably formed acute-angled. Device according to one of claims 1 to 3, characterized in that the space (12) forming resp. the groove (14) forming, lateral surfaces (15) are aligned parallel to each other and perpendicular to the axes (3,4). Device according to one of claims 1 to 4, characterized in that the Rillambos (6) has a continuous cylindrical surface (22). Device according to one of claims 1 to 4, characterized in that the Rillambos (6) on the periphery of the Rillmesser (5) facing recess (23). Apparatus according to claim 6, characterized in that the recess (23) has a with the Rillmesser (5) cooperating insert (24). Apparatus according to claim 7, characterized in that the insert (24) is designed to be elastic at least in the radial direction. Apparatus according to claim 5, characterized in that the Rillambos (6) on the circumference of the Rillmesser (5) facing elastic increase (25). Device according to one of claims 1 to 9, characterized in that the knife edges (13) are each attached to a part of a multi-part creasing member (5). Apparatus according to claim 10, characterized in that the distance of the intermediate space (12), respectively. the groove (14) forming side surfaces (15) is variable. Device according to one of claims 1 to 11, wherein the Rillmesser (5) by a Tastrad (18) on the Rillambos (6) is supported. Application of the device according to one of claims 1 to 12, in the production of printed products, in particular for the groove hinge-like bending points on an envelope (2) of the printed products.

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