EP1214264B1 - Device for cross cutting material strips, in particular cardboard strips - Google Patents

Abstract

A device for cross cutting a cardboard web in which, both the blade drums, a sheet transport conveyor accelerates the sheets and then the sheets are positioned to shingle the sheets on a further conveyor. The sheet transport conveyor has a rerouting roller at the outlet side of its upper pass and then extends downwardly into a sheet discharge gate through which defective sheets are effected.

Description

Technical area

The invention relates to a device for the transverse cutting of material webs, in particular of cardboard webs, comprising a cross-cutting device containing two Cross knives fitted knife drums and with a behind the cross cutter arranged sheet transport device, a belt conveyor for accelerating the sheets produced during the cross-cutting and an adjoining sheet Braking and overlapping device contains, in the a Schuppenstrom the bows is generated.

State of the art

Cross-cutting devices consisting of a paper or board web by cross-cutting produce individual sheets, which are then placed on a pile, are known to contain behind the cross cutter a sheet transport device, which starts with a fast belt conveyor. By means of the fast belt conveyor the web is streamlined when cross-cutting and the cut sheets are accelerated to fill a gap between them. The gap is needed so that a subsequently arranged braking device on the individual sheet trailing edges can attack. When braking an arc, the leading edge slides of the still unbroken succeeding bow over its trailing edge. This is how it is Shingled stream generated by overlapping arcs, which then in a Stacking device is placed on a stack. A generic cross-cutting device is described in DE-A-41 19 511.

Presentation of the invention

The invention is based on the object, a generic cross-cutting device be improved so that they with a structurally simplified design a lower Length.

This object is achieved with the features of claim 1.

In the cross-cutting device according to the invention, the sheet transport device begins with a fast belt conveyor, which is preferably designed very short. One Bow is accelerated briefly and then immediately released, so by braking the overlapping process can be initiated. The drawn gap between two consecutive sheets are kept as small as possible. immediate is located behind the outlet side pulley of the fast belt conveyor the entrance of a bow lock. For the lock entrance is thus no interruption required by belt conveyors. This allows the overall length of the transport device and thus significantly shorten the entire cross-cutting device.

The subclaims contain preferred, since particularly advantageous Ausgestatlungen the invention:

In the embodiment according to claim 2, the lower fast belt conveyor designed as short as possible and with the smallest possible distance from the knife drums arranged. The length of the transport direction is so extremely short.

According to claim 3 forms a catch roller with the upper strand of the fast Belt conveyor a tapered nip in which a new web start safe is taken over.

According to claim 4, the catch roller is advantageous at the same time the inlet-side guide roller an upper belt conveyor.

In the embodiment according to claim 5 is followed by the fast belt conveyor only a single other lower belt conveyor on which both the shingled stream is formed and also transported to the stacking device.

The claim 7 contains a particularly advantageous embodiment and arrangement of an element by means of which the arches at their trailing edges for overlapping be moved down.

The claims 9 and 10 contain embodiments of an inventive Cross-cutting device in which individual elements in a structurally simple form are designed so that the device can be opened to clear the jam.

Short description of the drawing

The drawing serves to explain the invention with reference to a simplified representation Embodiment.

Figur 1

die Seitenansicht einer Querschneidevorrichtung,

Figur 2

in einem vergrösserten Ausschnitt die Bogentransporteinrichtung und

Figur 3

den Bereich der Bogenschleuse.

Show it:

FIG. 1

the side view of a cross-cutting device,

FIG. 2

in an enlarged section of the sheet transport device and

FIG. 3

the area of the bow lock.

Ways to carry out the invention

The device shown in Figure 1 in an overall view is used for the production of Card sheets from a continuously fed cardboard web 1. In web / sheet travel direction (in the figures from left to right) the following components are consecutive arranged:

A longitudinal cutting device 2 in which the edges of the web 1 are trimmed and optionally the web 1 is divided into up to 6 individual tracks, a cross-cutting device 3, a sheet transport device 4, of which the produced during cross cutting Bows are adopted and slowed down, with a shingled stream forms, and a stacking device 5, in which the conveyed in the scale flow Arches are placed on stack 6, which lie on pallets 7.

The cross-cutting device 3 contains two superimposed in a known manner Knife drums 8, 9, each equipped with at least one transverse blade 10 are. Of the transverse knives 10, the web 1 is in the course of a paper cut cut. A in the frame of the cross cutter 3 in front of the knife drums 8, 9 stored, driven feed roller pair 11 leads the web. 1 the knife drums 8, 9 with the desired web speed.

Immediately behind the cross-cutting device 3 is the sheet transport device. 4 arranged, which is shown enlarged in Figure 2. It contains elements for transfer the web start produced at a cross section and to tighten the web when cross cutting, for accelerated onward transport of a cross section generated arc to create a gap between two sheets, and to decelerate a bow for making a shingled stream of overlapping Arches fed to the stacking device 5 with slowed transport speed becomes.

The sheet transport device 4 starts with the device for the acquisition of Web start and to accelerate the arc generated at the cross section. These Device consists of an upper catch roller 12, which from the top circumferentially to Conveyor plane reaches, and an associated lower fast belt conveyor 13. The Catch roller 12 is also the inlet-side guide roller of a fast rotating upper belt conveyor 14, which consists of several, spaced apart in parallel Bands exist that are at least beyond the range of maximum format length extend. On the outlet side, the upper belts 14 are driven by a deflection roller 15 deflected, which is driven by a rotary drive 16. This creates a gap formed between two arches, the fast top bands 14 are compared with one the speed of the incoming web 1 increased speed driven. With this increased speed, they also drive the catching roller 12.

To be able to adapt their circumferential position to different kart thicknesses, is the Catch roller 12 mounted eccentrically in lateral bearing shells, which by means of a Rotary drive 17 can be adjusted. A rotation of the bearings causes a Raising or lowering the catch roller 12.

It consists of a machine-wide belt or several parallel belts lower belt conveyor 13 is disposed below the catching roller 12 so that its upper conveying strand 18 in the entry plane of the sheet leading edges with the catching roller 12 forms a clamping gap. In the nip is an incoming web start taken and exerted a tensile force on him, the web 1 when cross-cutting tightens. The arc produced at the cross section is then increased with the Speed transported. One in the conveying plane between the knife drums 8, 9 and the belt conveyor 13 arranged guide plate 19 supports the web start, until it is taken over by the belt conveyor 13. The belt conveyor 13 is with the increased speed of the upper belt conveyor 14 driven. Being in the Conveyor level extending, the beginning of the web and the sheet produced therefrom promotional Trum 18 is from an inlet-side guide roller 20 and from an outlet side Deflection pulley 21 limited.

At a small distance behind the guide roller 21, the braking and overlapping device begins with an element for the downward movement of the sheet trailing edges. Preferably, the element consists of a vacuum can be acted upon suction box 22, whose upper wall is parallel with some distance below the conveying plane runs and has suction openings. Preferably, during operation, a continuous, non-intermittently interrupted negative pressure generated. From the negative pressure are sucked into the trailing edges of the sheets and braked. The downward movement The bow trailing edges can also aerodynamically acting baffles be effected, as described for example in DE-A-26 01 081.

Following the element for the downward movement of the sheet trailing edges follows lower belt conveyor 23, which extends to the stacking device 5. The lower belt conveyor 23 runs at the slower filing speed with which the bows on the Stack 6 are stored. The value of the filing speed is approx. 20% of the Web speed when cross-cutting, in the example about 80 m / min. When braking a bow pushes the leading edge of a subsequent, even faster running Arch over its trailing edge. This creates a scale flow of itself overlapping bows, with the slow filing speed on the subbands 23 is promoted.

To make a bow during braking in the overlap area at its top To safely lead, the lower strands of the upper bands 14 at least enough the length of the sheet format. On the outlet side, the effective conveyor line is through fixed, adjustable in height guide tube 24 limits that the lower Trums the upper bands 14 supported on the back and then upwards of the conveying path deflects away to the deflection roller 15. Immediately behind the guide tube 24 are circumferentially downwardly over the upper bands 14 reaching out, free-running mounted fishing wheels 25 on a common axis arranged. The catch rollers 25 press the leading edge of an incoming bow from the high-speed upper bands 14 down to the slower sub-bands 23. They form with the subbands 23 a nip, through which the generated scale flow is promoted.

Since the position of the guide tube 24 and the catch rollers 25 adapted to the arc length must be, these elements are stored in a carriage 26, which exceeds the required Area can be adjusted in and against sheet travel direction.

The outlet-side guide roller 21 of the belt conveyor 13 is at a distance of less than the maximum format length, preferably less than the minimum Format length, from the axis of rotation of the knife drums 8, 9 arranged and used at the same time as an ejector to the subsequently arranged brake and overlap device. An ejector roller guides a bow into a subsequent section of track in which he briefly, for at least a moment, not clamped promoted, so let go. This is achieved according to the invention in that following the guide roller 21 follows a route in the beginning no funding at the bottom of a bow attacks and in which the distance between the upper and lower conveying means is greater than the thickness of the located between them Sheets. On the outlet side, the track area without clamping the arcs of the fishing wheels 25 limited, with the slow sub-bands 23 a nip form, through which the scale flow is guided. The distance of the catch rollers 25 of the outlet-side guide roller 21 is thus at least a current format length.

Between the outlet-side guide roller 21 of the fast belt conveyor 13 and the Suction box 22 is arranged a bow lock, the enlarged shown in Figure 3 is. The bow lock is used to remove defective bows, for example of bows containing a splice point. A generic Bow lock is described in GB 973369.

To form the lock deflecting roller 21 directs the belt of the belt conveyor 13th obliquely down to another guide roller 27, from which it to the inlet side Guide roller 20 is returned. The guide roller 21 limits so the input of Bogenschleuse, and the belt conveyor 13 is advantageously used at the same time as a conveyor in the Sheet gate. On the outlet side, the entrance to the lock of a baffle 28th limited, which is attached to the suction chamber 22. Another idler 29 below the suction box 22 and a subsequent baffle 30 lead together with the Band 13 a discharged sheet to two driven draw rollers 31, 32 am Sluice exit, from which it is pulled out of the cross cutting machine.

Preferably, the front tension roller 32 and the belt conveyor 13 have a common Drive up. In the present example, the common drive is an electric motor 33, the one the guide roller 27 and the tension roller 32 circulating belt 34 drives. In order to open the lock for removing jams, the two rollers 27, 32nd mounted on each longitudinal side of the machine in each case on a pivotable side part 35, wherein on a side part 35 and the drive 33 is attached. The pivot axis 36 of the side parts 35 is located slightly below the guide roller 21, so that the inlet side part of the lock of a piston-cylinder unit 37 to open in Direction to the cutterhead 8, 9 can be moved. Above the conveyor level is in the area of the lock entrance between the catch roller 12 and the suction chamber 22 arranged a pneumatically actuable lock flap 38, which is for deflecting a bow in the lock to be moved down into the conveying plane can. The active position of the lock flap 38 is shown in FIG.

In a preferred embodiment, the two driven draw rollers 31, 32 designed as a chip rollers with rotating cutting rings. A discharged Sheet becomes chopped as it passes between the two draw rolls 31, 32 crushed, which fed to a arranged under the lock outlet container become. The Schnitzelwerk for discharged bows is thus advantageous in the bow lock integrated and does not require its own drive.

All arranged at the beginning of the sheet transport device 4 and across the Machine width extending elements, so the upper catch roller 12 with its adjustment 17, the bottom fast belt conveyor 13, the bow lock, the Suction box 22 and the inlet-side guide roller 39 of the slow lower belt conveyor 23 are mounted in a common carriage 40. The carriage 40 is limited slidable in and against the sheet travel direction in the side walls of the frame the sheet transport device 4 stored. The displacement of the carriage 40 takes place by means of lateral piston-cylinder units 41, which allows him from his working position as possible pull it to a position spaced from it, close to the cross cutter in the area between the cross cutting device 3 and the sheet transport device 4 is open. Thus, jams can be both in the cross cutter 3 and eliminate in the inlet of the sheet transport device 4.

Claims (10)

1. A device for crosscutting webs of material (1), especially webs of cardboard, having

   a crosscutting means (3) comprising two blade drums (8, 9) fitted with transverse blades (10) and

   a sheet transport means (4) that is positioned downstream from the crosscutting means (3) and that has a conveyor belt (13) that serves to accelerate the sheets created by the crosscutting, downstream from which there is a braking and overlapping means in which a stream of overlapping sheets is made from the sheets,

   characterized in that the transport means (4) begins with a lower conveyor belt (13) whose upper conveying belt run (18) is delimited on the outlet side by a deflection roller (21),

   which, as an ejection roller, feeds a sheet to a subsequent segment in which it is briefly conveyed in an unclamped manner, and

   which limits the entrance of a sheet lock, whereby the downwards deflected belt of the conveyor belt (13) simultaneous serves as a conveyor into the sheet lock.
2. The device according to Claim 1, characterized in that the distance between the outlet-side deflection roller (21) and the rotational axes of the blade drums (8, 9) is less than the maximum format length, preferably less than the minimum format length.
3. The device according to Claim 1 or 2, characterized in that, above the lower conveyor belt (13), there is a catching roller (12) that forms a nip with the conveying belt run (18) of the conveyor belt (13).
4. The device according to Claim 3, characterized in that the catching roller (12) simultaneously constitutes the inlet-side deflection roller of an upper conveyor belt (14) that extends at least over the area of the maximum format length.
5. The device according to one of Claims 1 to 4, characterized in that, at a distance behind the lower conveyor belt (13), there is another slower conveyor belt (23) that extends to the stacking means (5) and that forms a nip with catching rollers (25), said nip limiting the segment where the sheets are not clamped.
6. The device according to one of Claims 1 to 5, characterized in that, at a small distance behind the outlet-side deflection roller (21) of the conveyor belt (13), the braking means and overlapping means begins with an element for the downwards movement of the rear edges of the sheets.
7. The device according to Claim 6, characterized in that the element for the downwards movement of the rear edges of the sheets is a suction box (22) that can be kept under negative pressure and whose upper wall has suction openings and runs parallel below the conveying plane at a slight distance.
8. The device according to one of Claims 1 to 7, characterized in that, at the outlet of the sheet lock, there are two driven drawing rollers (31, 32) that are configured as shredding rollers.
9. The device according to one of Claims 1 to 8, characterized in that the inlet-side part of the sheet lock is pivoted on bearings in order to open the lock in the direction towards the blade drums (8, 9).
10. The device according to one of Claims 1 to 9, characterized in that all of the elements that are arranged at the beginning of the sheet transport means (4) and that extend crosswise over the width of the machine are secured in a shared carriage (40) that is mounted in the side walls of the frame of the sheet transport means (4) so as to move to a limited extent in and opposite to the running direction of the sheets.

Images