EP2604559B1 - Knife fold unit and method for folding preparation - Google Patents

Description

The invention relates to a sword folder with the preamble features of claim 1 and a method for seam preparation according to claim 7.

State of the art

Pocket folding machines and Schwertfalzmaschinen are known from the prior art. The combination of pocket folding machines with Schwertfalzmaschinen is common as Kombifalzmaschine. In this process, parallel folds are folded in pocket folders and cross breaks in the subsequent knife folders. The sheet passes through at least the following stations in the feed-through direction of the combination folding machine: feeder, transfer table, pocket folder, knife folder, delivery arm.

The construction of a Taschenfalzmaschine with a variety of Taschenfalzwerken goes out of the DE 10 2004 041 471 A1 out. A respective pocket folder consists of a folding pocket and three folding rollers, which are arranged in two pairs of folding rollers. From the DE 29 40 360 A1 is a single sword folding machine for folding of printed and pre-folded sheet known. Combination folding machines combine pocket folders and knife folders. Here are folded in a first folding station in Taschenfalzwerken parallel breaks and in a subsequent folding station in Schwertfalzwerken cross breaks. The DE 31 47 064 A1 and the DE 10 2006 055 301 A1 show Kombifalzmaschinen with a plurality of Taschenfalzwerken and nachranging arranged Schwertfalzwerken.

The EP 1 475 334 A1 shows a folding machine with a pair of knife shafts. The knife shafts are mounted parallel to each other between two spaced side walls of the folding machine. To cut folded sheets of paper perpendicular to a fold line, ie in the direction of sheet travel, perforate, crimp, grooving, grooving or pressing, the folding rollers of a folding unit knife shaft pairs are upstream or downstream. In the following, the terms grooves and grooves are used synonymously. What is meant is a material weakening of the sheet material by removing material, thereby reducing the cross-section.

The knife shafts are usually knife shaft pairs, in which one blade shaft are equipped with tools and the other blade shaft with counter tools. The tools are mounted on tool holders, which are pushed onto the knife shafts.

Such preparation of sheets to be folded is required to cause material weakening at the desired positions of the fold breaks and thus to ensure that the fold breaks are actually made at the intended position. Otherwise, the position of the fold breaks may differ, especially with thicker products, resulting in lower quality folded products.

The US 2,775,448 A discloses a sword folder according to the preamble of claim 1, wherein lines of weakness are used in the fold areas of thicker folded products.

A disadvantage of the use of knife shafts is on the one hand their complex adjustment to the correct position. When changing jobs it may be necessary to remove the knife shafts from the folding machines in order to be able to push additional knife holders onto the knife shafts.

Another drawback is that in very thick products made in pocket folding stations, subsequent folding in the knife folder is particularly difficult, i. it can easily come at the fold to a deviation from the Sollfalzlinie. In the next step, no book further processing, i. if the fold edge remains visible, the known material weakening methods can not be used since they would significantly impair the appearance of the product. Their application to very thick products is limited. This problem occurs, for example, in the production of newspapers with a sword fold in a so-called newspaper folder.

task

The object of the present invention is to provide a blade folder and to describe a method for seam preparation, wherein a precise fold breakage is made possible even with thick products and the problems of the prior art are at least reduced.

This object is achieved by a blade folder with the features of claim 1 and by a method for seam preparation with the features of claim 7.

The Schwertfalzwerk invention is used for folding arcuate elements and is suitable for use in a Bogenfalzmaschine. The sword folder has a transport device, a leading edge stop, a folding blade and a folding roller pair, wherein the arcuate element of the transport device in the transport direction under the folding blade and against the leading edge stop is transportable. The folding blade is not designed as a parallel folding sword, but - as is common - oriented parallel to the sheet transport direction. In the interaction of folding blade and folding rollers, the formation of a fold break is substantially parallel to the sheet transport direction in the arcuate element. According to the invention, a notching device with a notching element is provided in the region of the leading edge stop for introducing a notch into the front edge of the arcuate element. The introduction of this notch, alternatively also to be described as a small backcut, or small parting cut, has the advantage that the forces required for the formation of folds in the arched element are substantially reduced by the folding blade and the folding roller pair. In addition, unwanted wrinkling in the area of the back of the folded sheet member is greatly reduced. The introduction of the notch can thus reduce both the burden of the folding blade and its drive and thus their wear and significantly increase the quality of the seam breakage.

In an advantageous embodiment of the invention Schwertfalzwerks the notched element is designed as a circular blade. Alternatively, the notch element can also be designed as a double-circle knife, ie as a parallel arrangement of two circular knives. To adapt to the thickness of the arcuate element, the distance between be adjustable both circular knives of the double circle knife. The introduction of two notches through the double circular blade into the arcuate element could further reduce unwanted wrinkling at the ridge of the folded arcuate element.

In a particularly advantageous and therefore preferred embodiment, the notching device has a drive for the circular blade or the double circular blade, which is designed in particular as an electric motor.

In an advantageous development of the sword folder, the notching device has an actuator for moving the notching element from a waiting position into an operative position and vice versa, wherein the actuator is designed in particular as a pneumatic cylinder. The use of the actuator makes it possible that the notch is only introduced into the arcuate element when it is already present at the leading edge stop, so the notch element so not permanently and thus interfering protrudes into the transport path of the arcuate element.

In a further development of such a sword folder, a detector for determining the arrival of the arcuate elements is provided on the leading edge stop. The sword folder has a control unit, wherein at least the detector and the actuator are connected to the control unit via data lines, so that a measuring pulse of the detector can trigger the actuator, if necessary with a time delay.

• In einem ersten Schritt erfolgt das Ausrichten des bogenförmigen Elements mit seiner Vorderkante an einem Vorderkantenanschlag. Daraufhin wird im nächsten Schritt ein Kerbelement in seine Wirkposition eingefahren. Damit wird durch das Kerbelement eine Kerbe in der Vorderkante des bogenförmigen Elements erzeugt. In einem abschließenden Schritt wird das Kerbelement wieder von seiner Wirkposition in seine Warteposition ausgefahren.

The invention also relates to a method for seam preparation of an arcuate element in a knife folder, in particular a blade folder as described above, with the following steps:

• In a first step, the alignment of the arcuate element with its leading edge takes place at a leading edge stop. Subsequently, a notch element is retracted into its operative position in the next step. Thus, a notch in the leading edge of the arcuate element is generated by the notch element. In a final step, the notch element is extended again from its operative position to its waiting position.

In an advantageous embodiment of the method according to the invention, namely when the notching element is designed as a circular blade, this performs a rotational movement at least during the retraction and during the generation of the notch.

In a likewise advantageous development of the method according to the invention, during the alignment of the arcuate element, the arrival of the arcuate element in the region of the leading edge stop is detected, whereupon an actuator is actuated in order to retract the notch element into its operative position.

The subject of the present invention is also a sheet folding machine with a blade folder as described above for carrying out the method described above.

The described invention and the described advantageous developments of the invention are also in any combination with each other advantageous developments of the invention.

With regard to further advantages and constructive and functional aspects of advantageous embodiments of the invention, reference is made to the dependent claims and the description of embodiments with reference to the accompanying drawings.

Ausführunsgbeispiel

• Fig. 1 eine Falzmaschine mit einem erfindungsgemäßen Schwertfalzwerk in einer Übersichtsdarstellung
• Fig. 2 das erfindungsgemäße Schwertfalzwerk in einer Detaildarstellung
• Fig. 3 ein Falzprodukt mit Kerbe vor der Erzeugung des Kreuzbruches durch das Falzschwert

The invention will be explained in more detail with reference to preferred embodiments. It show in a schematic representation

• Fig. 1 a folding machine with a Schwertfalzwerk invention in an overview
• Fig. 2 the Schwertfalzwerk invention in a detailed view
• Fig. 3 a folded product with notch before the creation of the cross-fold by the folding blade

• Fig. 1 zeigt eine Konfiguration einer Bogenfalzmaschine, nämlich einer Kombifalzmaschine 100. Die Kombifalzmaschine 100 ist mit mehreren Taschenfalzwerken und einem Schwertfalzwerk 110 ausgestattet, wobei das Schwertfalzwerk 110 ein Falzschwert 111 und darunter angeordnete Falzwalzen 112 aufweist. Stromabwärtig des Falzschwertes 111 befindet sich eine Einkerbeinrichtung 10. Durch das Erzeugen von Parallelfalzen in den Taschenfalzwerken wird aus dem Bogen 1 ein dickes Falzprodukt 1. Um dieses Falzprodukt 1 im Schwertfalzwerk 110 einfacher falzen zu können, d.h. einen sogenannten Kreuzbruch zu erzeugen, ist die Einkerbeinrichtung 10 vorgesehen.
• Fig. 2 zeigt das erfindungsgemäße Schwertfalzwerk 110 in einer Detaildarstellung, wobei das Falzschwert 111 und die Falzwalzen 112 zur besseren Übersichtlichkeit weggelassen wurden. Ein durch vorhergehendes Falzen erzeugtes Falzprodukt 1 wird in Transportrichtung T von zwei Transportbändern 2 gegen einen Vorderkantenanschlag 4 transportiert. Von dem nicht dargestellten Falzschwert 111 und den nicht dargestellten Falzwalzen 112 soll an der gestrichelt dargestellten Falzlinie 3 ein Falzbruch erzeugt werden. Zur Vorbereitung dieses Falzbruchs wird in der Vorderkante 1.1, d.h. der stromabwärtigen Kante des Falzprodukts 1 eine Kerbe 9 erzeugt. Dazu ist eine Einkerbeinrichtung 10 mit einem Kreismesser 8 vorgesehen.

Corresponding elements and components are provided in the figures with the same reference numerals.

• Fig. 1 1 shows a configuration of a sheet folding machine, namely a combination folding machine 100. The combination folding machine 100 is equipped with a plurality of pocket folders and a blade folder 110, wherein the blade folder 110 has a folding blade 111 and folding rollers 112 arranged underneath. Downstream of the folding blade 111 is a Einkerbeinrichtung 10. By generating parallel folds in the Taschenfalzwerken from the sheet 1 is a thick folded product 1. To fold this folded product 1 in the blade folder 110 easier, ie to produce a so-called cross-break, is the Einkerbeinrichtung 10 provided.
• Fig. 2 shows the Schwertfalzwerk 110 according to the invention in a detailed view, wherein the folding blade 111 and the folding rollers 112 have been omitted for clarity. A folded product 1 produced by previous folding is transported in the conveying direction T by two conveyor belts 2 against a front edge stop 4. Of the folding blade 111, not shown, and the folding rollers 112, not shown, a fold break is to be generated at the fold line 3 shown in dashed lines. To prepare for this seam break, a notch 9 is produced in the leading edge 1.1, ie the downstream edge of the folded product 1. For this purpose, a notching device 10 is provided with a circular blade 8.

The arrival of the folded product 1 in the region of the leading edge stop 4 is detected by a Bogenankunftsdetektor 11 and reported to a control unit 12. The control unit 12 controls an actuator 6 designed as a pneumatic cylinder, so that the circular blade 8 is pivoted from a waiting position, not shown, into its illustrated operative position. For this purpose, the pneumatic cylinder 6 performs a lifting movement h, which pivots the circular blade 8 about the axis of rotation A. The control unit 12 also controls an electric motor 5, which drives the circular blade 8 via a belt drive. In this case, the rotary blade 8 can either be put into a rotational movement r only if it produces a notch 9, or can be a permanent one Perform rotational movement r. Once the notch 9 is generated, the rotary blade 8 is pivoted by the pneumatic cylinder 6 back into the waiting position.

In a non-illustrated embodiment of the sword folder 110, the signal of the Bogenanzunftsbogendetektors 11 is also used by the control unit 12 for the control of the drive of the folding blade 111, not shown, so as to trigger the Schwerthub at the right time. The Schwerthub can be done as soon as the circular blade 8 is moved from its active again in its waiting position.

In Fig. 3 is the result of the notching process shown. In the folded product 1, a small incision, namely a notch 9, was produced at its front edge 1.1. After the Schwertfalz the appearance of the folded product 1 is hardly affected due to the small size of the notch 9 and this negligible disadvantage is offset by a better quality fold break at the fold line 3 by far.

LIST OF REFERENCE NUMBERS

1

Sheet / folded product

1.1

leading edge

2

conveyor belt

3

fold line

4

Leading-edge stop

5

engine

6

Actuator (pneumatic cylinder)

7

camp

8th

Circular knife and position for double circle knife

9

Notch / separating cut

10

Einkerbeinrichtung

11

Sheet arrival detector

12

control unit

100

folding machine

110

A knife

111

folding knife

112

folding rollers

r

Rotational motion circular knife

H

stroke movement

A

axis of rotation

T

transport direction

Claims (10)

1. Knife folding unit (110) for folding sheet-shaped elements (1) in a sheet folding machine (100) including a transport device (2), a front edge stop (4), a folding knife (111) and a pair of folding rollers (112),
   wherein the sheet-shaped element (1) is transportable by the transport device (2) in a direction of transport (T) underneath the folding knife (111) and against the front edge stop (4),
   characterized in
   that in the region of the front edge stop (4), a notching device (10) including a notching element (8) is provided to create a notch (9) in the front edge (1.1) of the sheet-shaped element (1).
2. Knife folding unit according to Claim 1,
   characterized in
   that the notching element (8) is a circular knife.
3. Knife folding unit according to Claim 1,
   characterized in
   that the notching element (8) is a twin circular knife.
4. Knife folding unit according to Claim 2 or 3,
   characterized in
   that the notching device (10) includes a drive (5) for the circular knife (8) or twin circular knife (8), the drive in particular embodied as an electric motor.
5. Knife folding unit according to any one of the preceding claims,
   characterized in
   that the notching device (10) includes an actuator (6) for moving the notching element (8) from a stand-by position to an operating position and vice versa, the actuator (6) in particular embodied as a pneumatic cylinder.
6. Knife folding unit according to Claim 5,
   characterized in
   that the knife folding unit (110) has a detector (11) for detecting the arrival of the sheet-shaped elements (1) against the front edge stop (4) and a control unit (12), at least the detector (11) and the actuator (6) connected to the control unit (12) by data links.
7. Method for preparing the folding process of a sheet-shaped element (1) in a knife folding unit (110), in particular according to any one of the preceding claims, comprising the following steps of

   a) aligning the front edge (1.1) of the sheet-shaped element (1) against a front edge stop (4) in a knife folding unit (110)

   b) moving a notching element (8) into its operating position

   c) creating a notch (9) in the front edge (1.1) of the sheet-shaped element (1) by means of the notching element (8)

   d) moving the notching element (8) into its stand-by position
8. Method according to claim 7,
   characterized in
   that the notching element (8) is a circular knife that carries out a rotary movement (r) at least during steps b) and c).
9. Method according to claim 7 or 8,
   characterized in
   that during step a), the arrival of the sheet-shaped element (1) is detected, whereupon an actuator (6) is actuated to carry out step b).
10. Sheet folding machine (100) including a knife folding unit (110) according to any one of claims 1 to 6 for carrying out the method according to any one of claims 7 to 9.

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