EP3118147B1 - Buckling folder and sheet folding machine with such a buckling folder - Google Patents

Description

The invention relates to a pocket folder with the characterizing features of claim 1 and a sheet folding machine with such a pocket folder according to claim 5.

State of the art

Pocket folding machines and Schwertfalzmaschinen are known from the prior art. The combination of pocket folding stations with Schwertfalzstationen 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 pocket folders in the transport direction: feeder, transfer table, pocket folder, delivery.

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 prior art it is known to use air nozzles in folding pockets, which should help to lead through the pocket folder to be transported bow safely and selectively. In the EP 1 577 244 B1 the use of blowing air nozzles in a folding pocket arranged in the upper sheet guide immediately behind the upper pocket inlet is proposed. With the Blasluftdüsen a flow of air is to be generated, which extends substantially in the direction of entry of the folding pocket and so supports the running of an arc until it rests with its leading edge on a Falztaschenanschlag. In one possible embodiment, the blowing air nozzles are designed as venturi nozzles for this purpose.

The use of air jets in folding pockets is also in the DE 89 06 505 U1 , of the US 2,699,331 and the DE 7029693 U1 described. The latter discloses a window, altar or Zentralfalztasche for the execution of window, altar or Zentralfalzen. The task of working with compressed air Blasluftdüse is to ensure a safe shrinkage of a folded product produced in a first folding with already a fold break in the folding pocket of a second pocket folder. In one embodiment variant, the blowing air nozzles are part of a blow pipe extending over the entire width in the folding pocket.

The CH 564 476 A5 shows a folding unit, which was specially set up for the folding of Fensterfalzen. For this purpose, a blowing nozzle is provided in the folding unit, which is aligned in addition to the resulting in the closed Fensterfalzen fold of the middle part of the folded product.

Also known are so-called collection bags, such as those in the EP 0 511 574 A1 are described. Such collection bags serve to collect a plurality of individual sheets which are sequentially fed to a collection bag. The collected sheets are then ejected together from the collection bag and fed to a subsequent folding unit, so that the collected sheets can be folded there together.

It is also known to be folded sheets in an overlap, ie underfolded or überuppt, fed to a folding unit, eg from the DE 10 2008 048 286 A1 and the DE 10 2008 048 287 A1 , The leadership of the bow when entering and leaving the folding units, specifically: the folding pockets is particularly difficult.

A disadvantage of the aforementioned folders is that especially at high speeds sheet can not be transported safely through the folding unit and in a subsequent folder and it can lead to sheet damage or, for example, quality-reducing folding or Nachfalzen when initiating the seam breakage.

task

Object of the present invention is therefore to provide a pocket folder with improved guidance of arcuate elements in the pocket folder.

This problem is solved by a pocket folder with the features of claim 1.

The pocket folder according to the invention is used for folding sheet-like elements, in particular sheets of paper, cardboard and plastic which can also be supplied underfolded, and has a folding pocket and three rollers, two of the rollers a pair of transport rollers for feeding the arcuate elements and two further rollers Forming pair of folding rollers for folding the arcuate elements, wherein at least one Blasluftdüse is provided for guiding the arcuate elements in the Taschenfalzwerk. The blown air nozzle is advantageously designed and positioned such that a blown air jet directed radially to the common roll of transporting roller pair and pair of folding rolls originates from the at least one blown air nozzle, that is to say it is provided. The radial orientation of the blast air jet means that the blast air is aligned from the Blasluftdüse to the central axis of the input side of the two folding rollers. As a result, an arcuate element is applied to the surface of said roller and guided guided in the nip of the Falzwalzenpaares, whereby the folding quality can be increased.

In accordance with the invention of the pocket folder, at least the further roller of the folding roller pair, that is not the input but the pocket-side folding roller, which is not part of the transport roller pair, is provided on its surface with at least one channel surrounding the lateral surface, a so-called puncture , The channel is incorporated as a depression in the surface of the roller. This makes it possible that between the arcuate element and the Falzwalzenpaar air can escape faster and better during the folding process. A pressure build-up on one side of the arcuate element, namely below the arcuate element in the so-called rebate space, is thus avoided and the folding quality is increased.

In an advantageous embodiment of the blower is assigned to a control unit for targeted cyclically activating the Blasluftdüse. So the blast air can then each be activated when or just before a respective arcuate element rests with its leading edge on a leading edge stop the folding pocket.

In a particularly advantageous and therefore preferred embodiment of the invention, the pocket folder has a plurality of jet air nozzles arranged in a nozzle bar, wherein the nozzle bar extends approximately over the width of the folding pocket or the folding rollers.

In development of the pocket folder the folding pocket is arranged in an inlet angle of 20 to 40 ° to the inlet plane of the arcuate elements in the pocket folder. The inlet plane represents the plane in which arcuate elements are transported by the transport roller pair to the folding pocket and in which as well common tangent of both transport rollers is located. This arrangement of the folding pocket in a shallow angle is used for easier entry of the sheet in the folding pocket.

The invention also relates to a sheet folding machine with a pocket folder as described above.

A nozzle bar with blowing air nozzles as described above can also be used in a turning pocket, as used for example in the EP 1 925 579 B1 is described.

The invention described and the described advantageous developments of the invention are also in combination with each other - as far as is technically feasible - advantageous developments of the invention.

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

embodiment

The invention will be explained in more detail with reference to attached figures. Corresponding elements and components are provided in the figures with the same reference numerals. In favor of a better clarity of the figures was waived a true to scale representation.

Fig. 1

eine erfindungsgemäße Bogenfalzmaschine

Fig. 2 a und b

Taschenfalzwerke gem. dem Stand der Technik

Fig. 3

ein erfindungsgemäßes Taschenfalzwerk

Fig. 4 a und

b ein erfindungsgemäßes Taschenfalzwerk in einer Ausführungsvariante in Ansicht und Draufsicht

It show in a schematic representation

Fig. 1

a sheet folding machine according to the invention

Fig. 2 a and b

Pocket folders according to. the state of the art

Fig. 3

an inventive Taschenfalzwerk

Fig. 4 a and

b an inventive Taschenfalzwerk in a variant in view and plan view

FIG. 1 shows a sheet folding machine 100 with a sheet feeder 10, a feeding station with alignment table 20, a Taschenfalzstation 30 with two Taschenfalzwerken 30.1 and 30.2 and a signature delivery 50. In the area of the sheet feeder 10, a respective sheet 1000 is separated from the sheet stack 1001 and to the feed station 20 with alignment table to hand over. From the feeding station 20, a respective sheet 1000 is fed in the sheet transport direction T of the pocket folding station 30. In this case, a processing of the sheet 1000 by upstream cutter shafts 31 can be done to prepare the fold breaks. In the Taschenfalzstation 30, the actual processing, that is, the folding of the sheet 1000 by the interaction of folding pockets 33 and folding rollers 32. The structure of Taschenfalzstation 30 will be described below with reference to the other figures. A sheet 1000 which has been folded in the pocket folding station 30 is designed as a signature 1002 in the signature display 50.

In the FIGS. 2a and 2 B a pocket folder 30.1 according to the prior art is shown. A respective sheet 1000 is transported in the direction of transport T of two rollers 32.1 and 32.2, which form a pair of transport rollers, in the folding pocket 33 until the sheet 1000 rests with its leading edge on the front edge pocket stop 34. In the rebate 36 then sets, as in FIG. 2b illustrated, a compression formation and the sheet 1000 is in the folding gap between the rollers 32.2 and 32.3, which a Form folding pair, seized and there is the actual folding. The course of the compression depends on many factors, such as the sheet speed, the grammage of the sheet, the formation of the Falztascheneinlaufs 35, the width of the sheet 1000, the surface of the rollers 32, etc.

To improve the folding quality, is - as in FIG. 3 shown - in the inlet region 35 of the folding pocket 33, that is arranged in the region of the upper lip, a nozzle 41 with several Blasluftdüsen 40, wherein the Blasluftdüsen 40 are aligned so that they provide an air jet 42, which is aligned radially to the second roller 32.2, ie to Center axis of the second roller 32.2 is directed. This jet of air 42 causes a sheet 1000 securely abuts flat against the second roller 32.2 and thus defined in the Falzwalzenspalt the Falzwalzenpaares 32.2, 32.3 is introduced. On the other hand, an air jet directed directly into the folding roller gap could not increase the folding accuracy. The initiation of the folding process would be dominated by the air flow in this case and the formation of folds would no longer be exactly reproducible since a sheet would more or less randomly "flap" into the nip of the pair of folding rolls. On the other hand, due to the radially directed air jet 42 according to the invention, a high-precision initiation of the folding process, which is reproducible for each sheet 1000, results. The formation of the fold fracture is in this case essentially due to the geometric conditions of the folding unit 30.1, namely the position of the pocket stop 34.

In the in FIG. 3 illustrated embodiment, the folding pocket 33 is aligned in an inlet angle α of about 25 ° to the inlet plane E. In contrast to conventional in the prior art inlet angles of about 45 °, a sheet 1000 can run into the fold pocket 33 easier and intake problems can be avoided.

The blower air nozzles 40 may be integrated in the position shown in a nozzle bar 41, which extends across the width of the folding pocket 33 and the folding rollers 32, see FIG. 4b , As in further FIG. 4b indicated, the nozzle bar 41 is connected to a Blasluftquelle and can be clocked by a machine control supplied with a blown air. For this purpose, in the pocket folder 30.1 a data transmission technology with the Integrated machine control integrated, which monitors a concern of each sheet 1000 with its leading edge on the pocket stop 34 and provides a pulse for the provision of blowing air.

In the in FIG. 4a illustrated embodiment, in the surface of the pocket-side folding roller 32.3 at least one channel 37, a so-called puncture, incorporated. The channel 37 is formed by a depression in the lateral surface of the folding roller 32.3 and is in particular endlessly running around the circumferential surface of the roller 32.3. The channel 37 thus forms an air channel, which assists the escape of air, which is below a sheet 1000, that is between the sheet 1000 and the pair of folding rollers 32.2, 32.3. The air located here, which is disturbing during the initiation of the folding process, since the sheet 1000 can interfere only more difficult to the folding rollers 32.2 and 32.3, thus not only at the bearing ends of the folding rollers 32.2, 32.3 escape, but in addition to the Channel 37. As in FIG. 4b shown in a plan view, a plurality of channels 37 are embedded in the lateral surface of the folding roller 32.3.

LIST OF REFERENCE NUMBERS

10

sheet feeder

20

feeding

30

Taschenfalzstation

30.1

First pocket folder

30.2

Second pocket folder

31

Upstream knife shaft

32

folding rollers

32.1

First roll

32.2

Second roller

32.3

Third roller

33

folding pocket

34

pocket stop

35

Enema (upper lip of the lip)

36

rebate

37

channel

40

blowing air nozzle

41

nozzle bar

42

air jet

50

signature display

100

Bogenfalzmaschine

1000

bow

1001

sheet pile

1002

Signature (folded sheet)

e

inlet plane

T

transport direction

α

entry angle

Claims (5)

1. Buckle folding unit (30.1, 30.2) for sheet-shaped elements (1000) including a folding buckle (33) and three rollers (32.1, 32.2, 32.3) forming a transport roller pair (32.1, 32.3) for feeding the sheet-shaped elements (1000) and a folding roller pair (32.2, 32.3) for folding the sheet-shaped elements (1000), wherein at least one blown-air nozzle (40) is provided to guide the sheet-shaped elements (1000),
   wherein a blown-air jet (42) directed radially to the common roller (32.2) of the transport roller pair and the folding roller pair originates from the at least one blown-air nozzle (40),
   characterized in
   that at least the further roller (32.3) of the folding roller pair has at least one gap (37) at its surface and
   that the at least one gap (37) is designed as an endless surrounding gap on the jacket surface of the roller (32.3).
2. Buckle folding unit according to claim 1,
   characterized in
   that the blown-air nozzle (40) is assigned a control unit for cyclically activating the blown-air nozzle.
3. Buckle folding unit according to any one of the preceding claims,
   characterized in
   that the buckle folding unit (30.1, 30.2) has a plurality of blown-air nozzles (40) disposed in a row in a nozzle bar (41).
4. Buckle folding unit according to any one of the preceding claims,
   characterized in
   that the folding buckle (33) is disposed at an entry angle (a) of between 20° and 40° relative to the entry plane (E) of the sheet-shaped elements (1000).
5. Sheet-fed folder (100) including at least one buckle folding unit (30.1, 30.2) according to any one of the preceding claims.

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