ES2199622B2 - APPARATUS AND TRANSVERSE CUTTING METHOD FOR A METERIAL BAND MODE, AS WELL AS LEAF CUTTER. - Google Patents

Abstract

The present invention relates to an apparatus for continuous transverse cutting of a band-like material (4), comprising means (1,3) for maintaining the band (4) in a tensioned condition until the moment of cutting, an assembly (2) for supporting the band and at least one element (5) of the perforating blade of the band on the opposite side of the band, said assembly (2) comprises at least one arrangement (6) to allow the drilling action of the blade element (5) through the band (4). The invention also relates to a method for continuous cutting of a band (4), in which said band (4) is maintained in a tensioned condition and is perforated in a direction transverse to the machine direction with an element (5) of blade in one or more operations, in the place of the supported band. In addition, the invention relates to a continuous operating sheet cutting unit in a paper pulp drying machine, in which a cross cutting device (2) for sheet cutting corresponding to the apparatus for cross-cutting described above.

Description

Apparatus and cross-cutting method for a band-like material, as well as leaf cutter.

The present invention relates to an apparatus for the cross section of a band-like material, such as a pulp or paper strip, as well as a cutting method cross. In addition, the invention relates to a unit for cutting leaves.

In the cross-cutting mechanisms of the prior art employed in a pasta dryer machine bin, the cutting procedure is based on a blade Swivel cross-section and a solid counter knife. He objective is to produce a clean cutting trace. A good result of cutting requires that the blades be permanently sharp and a controlled clearance of the blades. As the size increases of the machines, especially their width, the control of the clearance of a blade becomes increasingly difficult, maybe even impossible. In any case, a technical solution will be very expensive on currently available equipment, which includes a rotating blade and a counter knife. At the cut point, a paper pulp band is compressed between the blades before the band is cut. In said cutting operation, the edge areas of a sheet undergo material contraction of paste and lumps of material ("fish eyes") originate. Such lumps of material are not desirable considering the subsequent treatment of a sheet of pasta, while the results of court, in themselves, should not be particularly good since, after all, the cut pasta sheet will be subjected to a additional treatment

An object of the present invention is to provide a improved cross cutting apparatus for a paste band trash can, which is also simpler and more effective than equipment currently available, in terms of operation And maintenance.

The basic conception of an apparatus and a method according to the invention, is that it comprises means for maintaining a tension in the band at a cut-off point, as well as a set of blades capable of piercing a band to cut it.

An apparatus according to the invention is characterized because it comprises at least

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media (1, 3) to maintain the tension of a band (4) at the time of cut as well

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a set capable of transversely cutting the band, which understands

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to the minus a band support assembly (2) on one side of the band (4) and

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to the minus a knife element (5) band perforator, on the side essentially opposite of it,

in which said band support assembly (2) includes at least one arrangement (6) to allow the piercing action of the element (5) of blade extends through the band (4) so that it is supported, simultaneously, in the vicinity of an area drilling

In a preferred embodiment, the apparatus It comprises two pairs of rotating rollers, to tighten the belt, separated from each other in the direction of band travel, as well as a pair of rotating cross-cutting rollers between they, the band being guided through said pairs of rollers, and of which one of the cutting rollers is provided with, at less, a blade element, band perforator, which extends from the circumferential surface of the roller and one of The belt support rollers have their surface circumferential endowed with at least one throat or groove in cooperation with said blade element.

In another embodiment of the invention, the water pair Traction roller top has a rotation speed lower than the pair of downstream traction rollers.

An apparatus according to the invention is based on the perforation of a band, not in its cut. A requirement to achieve the perforation is that the band is tensioned at the point of drilling, so that the piercing blade can be driven easily within the band and through it.

With respect to the usual equipment provided with rotating blades and counter knives, the device of the invention is less noisy and can also be designed using thin-walled rollers or cylinders, lighter.

In a preferred embodiment of the invention, the or The blade elements are included in a cutting roller upper and the or the throats, respectively, in a roller of lower cut.

The construction of the rollers used in a recommended embodiment, may have a design such that the frame of support of the band of a cutting roller is provided with circumferential throats and, respectively, the surface circumferential of a roller located above, be provided with piercing blades that match the throats.

Another advantage achieved by the invention is that, if necessary, the number of blades can be increased, said number being generally 1-4. He counter knife roller can be provided with a number corresponding of throats or of a single throat, using a speed difference between the rollers to make the punch blade always find a throat present in the frame.

The continuously rotating roller described in above, it can also be replaced by a linkage articulated connection that performs a reciprocating action. This type of solution can be implemented, for example, of such so that on one side of a band (either the upper or the bottom) there is a continuously rotating roller provided with a punch blade and there is a drilling slot included in an articulated connecting linkage that works as a counterpart for the roller and with an arched top surface provided with a transverse groove in the length of the piercing blade, that is able to receive the blade in an operation of drilling and cutting. In its simplest form, articulated linkage of connection can work in such a way that the blade of the roller of a rotating blade roller "drive" the articulated linkage linkage. When subjected to traction by the blade roller, linkage linkage oscillates from a starting position to seat against a cushion while the through cut takes place. After cutting, articulated linkage connection is returned to its starting position, for example, by middle of an elastic force. You can also build a bar blades using a similar linkage linkage, so both the blade bar and a bar counter knife, take the form of articulated rods of connection that move in reciprocating.

In embodiments with several blades, these they can be intended to be retractable, making it possible, easily use the same device to work with sheets of different sizes. This may be necessary if, for example, it is desirable to wrap a bullet of pulp in the same paste as form the bullet, being able, the cutter of the invention, to work easily with bullet wraps (= larger sheets) by retraction of some of the blades, even when the machine is working

In the construction of the invention, it is not necessary make an adjustment of the blades, which constitutes a Important practical advantage. On replacing a blade in a mill of pulp can take up to six hours and said blade It has a working life that goes from about 3 months up to 1 year, depending on how much is used.

The invention also relates to a method for cutting, in continuous action, a web-like material, such as a pulp or the like. This method is characterized in that the band is maintained in a tensioned condition and is perforated transversely to it with a knife element in one or more operations at the same point of the band, and because the band is supported, during the drilling process in the perforation point, so that the knife element can penetrate through the web, essentially entirely in the direction transverse to the direction of the
machine.

In the method, the tension of the band is maintained such that the piercing blade does not alter the direction Main band offset.

In addition, the invention relates to a unit continuous operating sheet cutter in a machine pulp dryer, comprising at least

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a Clearing mechanism for a pulp band, to cut it, on several laterally adjusted splitting devices, in bands separate longitudinals,

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a pair of traction rollers or the like, to maintain a tension desired on the band in the drying section and to pull the band,

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a cross cutting device to cut the bands separated,

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a overlapping device for sheets, in which the sheets are overlapping to reduce the speed of the pulp band, as well as

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a bullet formation table or similar to stack the sheets on She in order to form bullets.

This leaf cutter unit is characterized because the cross-cutting device, in which the bands separated are cut in the form of sheets, it comprises at least

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a band support assembly, next to the band,

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a perforating blade element of the band on the side essentially opposite of it, comprising the set of band support an arrangement to allow an action of perforation of the blade element extends through the band while simultaneously supporting it in the functional proximity of a drilling site,

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a set to adjust / arrange the band with a tension predetermined at the time of band cutting.

The invention will now be described in greater detail. referring to the attached drawings, in which:

fig. 1 shows an apparatus of the invention in a realization,

the figs. 2 and 3 illustrate a second embodiment preferred of the invention,

fig. 4 represents another embodiment of invention, in which one of the blades is retractable,

fig. 5 shows a solution of the invention, in the that the cutting of a band is done in two operations separated,

the figs. 6 and 7 show details of the embodiment of fig. 5, and

fig. 8 represents a cutting unit of sheets of the invention.

The apparatus of the invention is based on the fact that a band is not cut with a blade, but is perforated, requiring that the band be tensioned at the time and in the drilling area.

Fig. 1 shows a fundamental solution for an apparatus of this class according to the invention.

In the direction of travel of a band 4 of pulp, there are two separate pairs of rollers 1 and 3, being Guided the band through it. The pair of downstream rollers 3 It has a higher rotation speed than the first pair of rollers 1, the band 4 being tensioned between these pairs of rollers.

Between pairs 1 and 3 of rollers, they are mounted a second pair of rollers 2, of which the upper roller has its outer frame provided with a perforating blade 5, which extends from the frame. The lower roller 2, which supports the band 4, is provided with a circumferential recess 6 that cooperates with the perforating blade 5 of the upper roller in such a way that, when the upper roller is rotating, the means of perforation 5 and recess 6 mutually coincide in the band, penetrating the drilling means 5 in the band and punching her

Fig. 1 illustrates only means 5 of drilling, but its number can be increased as required by the case, the practical number of blades being 1-4, as illustrated in fig. 4. Respectively, the lower roller 2 may be provided with an equivalent number of throats 6 contrary to drilling media 5.

Figs. 2 and 3 illustrate an embodiment of the invention in which a band passes between a roller provided with a blade 5 and a backing element 11 arranged below and provided of a support surface to support the band. In this embodiment, the support surface is not constituted by a roller but by the system-shaped backrest element 11 articulated, with its peripheral surface provided with a throat 6 in cooperation with the blade 5. At its base, the element of backup 11 is hinged to a support set and works in swing along a path defined by two limiters 12.

In fig. 2, the backup element 11 is is in its starting position, against a left member 12 of cushion, in whose position the upper blade 5 coincides with the throat 6 present on the support surface when pressing through of a band 4.

As roller 2 rotates, the element of backrest 11 rotates along with blade 5 and is released from it, as is shown in fig. 3, when the backup element enters contact with the limited 12 on the right. In this position, a spring 13 pulls the backing element 11 to return it to the starting position

In the embodiment illustrated in figs. 2 and 3, the backup element 11 in the form of an articulated system works continuously, being driven by the upper rotating roller. It is also possible that said articulated system can be made function mechanically

Fig. 4 represents an embodiment with reference to four transverse blades. One of the blades 5 full width is positioned in a throat-like recess which has a depth such that the blade 5 can be retracted completely inside the recess. The blade 5 is intended for move to and out of contact with guide surfaces. In this embodiment, the actuator consists of several solenoids 25 electrically controlled, able to retract the blade even while the machine is running, if this is desirable. Load it is achieved, for example, by means of a spring that normally keeps the blade extended when the band is drilled. He actuator, such as solenoids 25, is powerful enough to retract the blade against the spring load. The blades they remain extended, typically, but in circumstances special the solution of the invention can be easily changed to work with sheets of different sizes, such as sheets for wrap bullets. Through a transfer path that is extends through a tree, the actuator or the actuators are connect with a control unit to control the position of the blades

Figs. 5-7 illustrate a embodiment of the invention in which a band is cut transversely in several sequences. This is represented schematically in fig. 5.

Fig. 6 shows the drilling point in transverse view to the direction of travel of the band 4. The The apparatus is provided with a back plate 7 for the band 4. The backing plate 7 constitutes an opening or recess 6 at the point of perforation, in which a roller 2 of support of the band can Make contact with this one. The roller 2 is provided with throats 10 which extend circumferentially, which correspond to the transverse throat 6 of the surface of the roller 2 shown in the fig. 1. The throats that extend circumferentially are parallel to each other and correspond, in number, to the number of blades 5 drills included in the upper roller.

The piercing blades can be positioned in several rows separated from each other in the direction of band displacement. The embodiment shown in figs. 5-7 includes groupings 5, 50 of blades that are mounted in two successive rows (fig. 5) in line with the axis Longitudinal geometric of the upper roller. In line with the blades 5, 50 and below the band 4, there are backup rollers 2, 20, respectively.

The position of the blade can be adjusted by means of a screw 9 for adjusting and fixing, which extends to through a slot 8. Similarly, the blade is very easy to replace.

The blade has very little wear and so it is Very rare that should be replaced.

Fig. 7 illustrates the embodiment of fig. 6 as seen in the direction of movement of the band. Fig. 7 represents a grooved design of the lower roller and the positioning of the perforating blades 5, 50 in line with Throats 10 that extend around its circumference. Depending on the width of the band, the number of blades can be 1-4.

The continuous sheet cutting unit of the invention, used in a pulp dryer machine and schematically represented in fig. 8, comprises a device 14 glue feed for a band 4 of pulp, which it is preferably mounted in connection with the cutting unit and to which the band is delivered from a drying section. Usually, the band simply moves past the device glue feed, which is not necessary except in a situation of feeding. Subsequently, in a cutting unit of the invention, the band 4 is advanced towards a set 15 to split it with several mounted splitting devices laterally, in order to form separate longitudinal bands. The cleft width is determined according to whatever desirable in a particular type of splitter. After being split, the separate bands are additionally transported to a pair of traction rollers 1 that maintain, in a drying section, a desired tension of the band and that pull the band (at this point, split bands, separated). From the pair of traction rollers 1, the split bands, separated, are fed to a device cross-cutting perforator 2 according to the invention, for cut the separate bands in the form of sheets, by drilling according to the invention.

The cross cutting perforating device of the invention for cutting separate bands in order to form sheets, comprises at least one band support set 2 on one side of a band 4, a perforating blade element 5 of the band, in the essentially opposite side thereof, said said band support set 2 an arrangement 6 to allow that a punching action of the blade element, extend through band 4 while supporting it in the vicinity Functional drilling area, as well as a mechanism 20 for adjust / arrange the band with a predetermined tension in the time to cut it.

According to the invention, downstream of the drilling-cutting unit 2, there is a second pair of traction rollers 3 to maintain a desired tension in the cross cutting apparatus, as well as for guiding the blades 16 also cut, if necessary, in an overlapping configuration, on a bullet table, so it’s possible, also, use a separate set of traction rollers 17 for overlap. When one or more rejection gates 19, in connection with the pair of traction rollers 3, they are closed, the leaves advance in the procedure following a trajectory normal to the support rollers of a sheet conveyor and, additionally, on top of a bullet formation table 18.

The continuous sheet cutting unit of the invention, used in a pulp dryer machine, is able to eliminate various problems existing in the prior art architecture. The use of a cutting unit of sheets of the invention assumes, for example, that it is not necessary build a complicated temperature stabilizer unit to the counter knife, which means savings in terms of space, energy and investment costs. The leaf cutter unit of the invention is also significantly less noisy than prior art solutions. There is more freedom to design a sheet cutting unit of the invention, since a section of downward path to the cutter, as is the case of the prior art solution.

Claims (6)

1. A cross-cutting apparatus for a band-like material (4), such as a pulp band or similar, said apparatus comprising at least

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media (1, 3) to maintain the tension of the band (4) at a time of cut as well

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a set capable of transversely cutting the band, which comprises the minus a band support set (2) on the side of the band (4) that is in opposition to a blade,

characterized in that the frame of the band support cutting roller is provided with throats (10) that extend circumferentially and, respectively, the circumference of the roller located above is provided with the perforating blades (5) that match the throats. 2. A cross-cutting apparatus as set forth in claim 1, characterized in that the number of throats (6, 10) and, respectively, that of piercing blades (5) is 1-4. 3. An apparatus as set forth in any one of the preceding claims, characterized in that there are several blade elements (5, 50) and one of them, at least, is retractable. 4. A continuous blade cutting unit, in a pulp dryer machine, comprising at least

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a Clearing mechanism for a pulp band, to cut it, in several splitting devices (15) adjusted laterally, in separate longitudinal bands,

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a pair (1, 3) traction rollers or the like to maintain, in a drying section, a desired tension of the band and to pull a band (4),

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a cross cutting device (2), for cutting the bands separated in sheets (16), comprising a set (2) in the other side of the band to support the band (4),

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a overlapping device (17) for sheets, in which the sheets are overlapping to reduce the speed of the pulp band, as well as

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a bullet formation table (18) or the like to stack the sheets (16) in it in order to get bullets,

characterized because - the cutting device transverse, in which the separated bands are cut to obtaining the sheets (16), comprises, when less,

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a perforating blade element (5) of the band on the side essentially opposite in relation to the set that supports the band (4), the band support assembly comprising a arrangement (6) to allow a drilling action of the blade element (5), extend through the band, supporting it simultaneously in the functional proximity of a place of drilling,

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a set (20) to adjust / arrange the band (4) with a tension default at the time of cutting the band.

5. A continuous-acting sheet-cutting unit in a pulp dryer, as set forth in the preceding claims, characterized in that it comprises the assembly (20) for adjusting / setting a speed difference between the pair (1, 3) of traction rollers and the overlapping device (17) for the blades (16) and / or a moment between them in order to establish a predetermined tension at the time of cutting. 6. A continuous sheet-cutting unit in a pulp dryer, as set forth in claims 4 or 5, characterized in that the assembly (20) for adjusting / arranging the band (4) with a predetermined tension in when cutting the belt, it comprises a second pair (3) of traction rollers, downstream of the drilling-cutting unit, to maintain a desired tension in the cross-cutting device, as well as to guide the advance of the cut sheets .