EP2505532A2 - Device and system for sheet transportation - Google Patents
Device and system for sheet transportation Download PDFInfo
- Publication number
- EP2505532A2 EP2505532A2 EP12382122A EP12382122A EP2505532A2 EP 2505532 A2 EP2505532 A2 EP 2505532A2 EP 12382122 A EP12382122 A EP 12382122A EP 12382122 A EP12382122 A EP 12382122A EP 2505532 A2 EP2505532 A2 EP 2505532A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- board
- bore holes
- conveyor belts
- sheets
- series
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H5/00—Feeding articles separated from piles; Feeding articles to machines
- B65H5/22—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device
- B65H5/222—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device by suction devices
- B65H5/224—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device by suction devices by suction belts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/50—Surface of the elements in contact with the forwarded or guided material
- B65H2404/51—Cross section, i.e. section perpendicular to the direction of displacement
- B65H2404/513—Cross section, i.e. section perpendicular to the direction of displacement with limited number of active areas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2406/00—Means using fluid
- B65H2406/10—Means using fluid made only for exhausting gaseous medium
- B65H2406/11—Means using fluid made only for exhausting gaseous medium producing fluidised bed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2406/00—Means using fluid
- B65H2406/30—Suction means
- B65H2406/36—Means for producing, distributing or controlling suction
- B65H2406/364—Means for producing, distributing or controlling suction simultaneously blowing and sucking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/17—Nature of material
- B65H2701/176—Cardboard
Definitions
- the present invention describes a device and system for conveying sheets, such as sheets of paper or cardboard, of the type comprising a board provided with bore holes, conveyor belts and blowing and suction means.
- Devices like that described in patent document US5133543 comprising a pair of conveyor belts which creates sufficient grip for conveying the sheets by means of creating a lower vacuum chamber, also having compensation holes preventing the generation of negative pressure between converging conveyor belts, in addition to being able to provide an air baffle to facilitate the lateral travel of the sheets for suitable lateral positioning.
- An objective of the present invention therefore is to disclose a conveyor device lacking pressure wheels which allows being able to readily retain the sheet on the conveyor belts in the end conveyor sector for handling.
- the device for conveying sheets of the present invention is of the type comprising a board provided with bore holes forming a first and a second series of bore holes; blowing means connected to the first series of bore holes of the board, determining at least one blowing area; at least two conveyor belts arranged such that they slide on said conveyor board in the forward movement direction of the sheets, said conveyor belts being essentially parallel to one another and the gap between conveyor belts comprising a blowing area; and suction means connected to the second series of bore holes of the board, arranged below the conveyor belts, determining suction areas.
- the device is essentially characterized in that the conveyor belts are provided with holes along their entire length which uncover intermittently and during the forward movement of the belt the bore holes of the second series of bore holes, and in that the conveyor board comprises separation barriers between blowing areas and suction areas, arranged adjacent to each side of each conveyor belt on the upper edges of which the sheet is supported during its travel over the board, preventing the sheet from adhering to the surface of the board during its forward movement and allowing the creation of sufficient air baffle to allow being able to readily retain the sheet on the conveyor belts in the end conveyor sector for handling.
- the separation barriers have a height similar to that of the conveyor belts, allowing the sheet to be supported on the separation barriers, in one variant of interest, the upper edge of the separation barriers being coplanar with the outer face of the conveyor belts, which allow that even though the sheet is made of a rigid material, it is always supported on the separation barriers.
- the aligned bore holes arranged below the same conveyor belt are separated 10 cm, allowing a sheet of this length to always be arranged on a suction area.
- the distance between adjacent holes of the same conveyor belt is 8 cm, allowing the bore holes of the second series of bore holes arranged below the belt to be constantly covered and uncovered.
- the bore holes of the second series of bore holes are of the same size as the holes of the conveyor belt, allowing a hole to completely uncover a bore hole when they align, therefore maximizing suction.
- the holes of the conveyor belt can naturally be larger than the bore holes of the second series of bore holes because the suction force is not affected.
- the device comprises retractable retaining means in the board synchronized with the speed of the conveyor belt and, therefore, with the passage of sheets, for momentarily retaining each sheet, blocking its forward movement, without retaining the conveyor belts on which the sheet is traveling, and thus being able to square the sheet in the direction perpendicular to the forward movement direction of the sheet.
- the board is inclined with respect to the horizontal, allowing the conveyance of sheets at a different height.
- said inclination of the board is different at different points of said board, being able to determine a convex board, preventing the board from having steep ramps.
- the device comprises four conveyor belts, allowing the conveyance of sheets of intermediate width.
- the device comprises six conveyor belts, allowing the conveyance of sheets of greater width.
- the system of the present invention comprises a feeder suitable for obtaining sheets from a stack and at least one device according to the present invention suitable for conveying the sheets obtained from said feeder to squaring means.
- Figures 1 , 3 and 4 show different views of a device 1 for conveying sheets 2 according to the invention.
- the device comprises a board 3 made of a rigid material, such as a sheet metal or wood inlaid with stainless steel, on which the sheets 2 are conveyed by means of conveyor belts 8.
- the board 3 it is possible to form the board 3 from different sectors of board, attached to one another, to cover the desired path.
- the sheets 2 can be semi-rigid, such as sheets of cardboard, or flexible, such as sheets of paper or plastic.
- the sheets 2 are obtained from a stack from where they are separated by means of a feeder of the type known in the state of the art, which feeder delivers them to the conveyor device 1 in a staggered manner, adjacent sheets being partially overlapped, or said sheets alternatively being delivered in series, i.e., one by one. It is stressed that when conveyance is staggered, the board 3 is completely covered by the sheets, there being no gaps between sheets, advantageously achieving better conveyance of said sheets by completely covering the surface of the board 3, as will be seen below.
- Said sheets 2 must then be conveyed by means of the conveyor belts 8, which are driven in the same direction by rollers 6 to the point where said sheets 2 must be delivered.
- the variant of the invention shown in Figure 1 comprises two conveyor belts 8 which are arranged such that they slide on the board 3 in the forward movement direction of the sheets 2, shown by the arrow F.
- Said conveyor belts 8 are essentially parallel to one another so that the direction of conveyance is rectilinear.
- bore holes 4 have been made in said board 3 to facilitate conveyance of the sheets 2 by means of the conveyor belts 8.
- a first and a second series of bore holes 4a, 4b can be seen in said bore holes 4, depending on the functionality of said bore holes 4, which will be described below.
- the first series of bore holes 4a is connected to typical blowing means 5 by means of blowing ducts 13 through which air is expelled through the bore holes 4 forming a blowing area 7 in which an air pocket is created between a board 3 and the sheets 2 which are conveyed and pass over the bore holes 4 of the first series of bore holes 4a, facilitating the sliding of the sheets 2.
- the second series of bore holes 4b is connected to typical suction means 9, such as a suction pump or suction turbine, by means of respective suction ducts 14, determining a suction area 10 around said second series of bore holes 4b.
- the conveyor belts 8 are provided with holes 11 along their entire length, the bore holes 4 forming part of the second series of bore holes 4b being visible in the detail of board 3 of Figure 2 , advantageously covered below said conveyor belts 8.
- the holes 11 of said conveyor belt 8 cover and uncover intermittently each of the bore holes 4 of the second series of bore holes 4b, allowing the sheet 2 traveling over a sector of conveyor belt 8 to be adhered intermittently and exerting an increasing and decreasing force against the conveyor belt as the holes 11 are eventually aligned with the respective bore holes 4 of the second series of bore holes 4b during the forward movement of the conveyor belts 8.
- the separation between consecutive bore holes 4 of the second series of bore holes 4b is 10 cm
- the separation between consecutive holes 11 is 8 cm.
- the bore holes 4 of the second series of bore holes 4b are of the same size as the holes 11 of the conveyor belts 8.
- the aligned bore holes 4 arranged below the same conveyor belt 8 are separated 10 cm from one another, whereas the distance between adjacent holes 11 of the same conveyor belt 8 is 8 cm, the diameter of both being the same, 2 cm.
- This difference of distances means that the bore holes 4 close to one another are not covered or uncovered at the same time, but rather with a certain lack of synchronism, favoring each sheet 2 always being arranged on top of a partially uncovered bore hole 4 of the second series of bore holes 4b.
- the air expelled by the first group of bore holes 4a in the blowing area 7 creates an air pocket facilitating conveyance of the sheet 2, nevertheless, it is necessary that this air exiting with certain pressure is not quickly absorbed by the suction area 10 of the second group of bore holes 4b, because this would weaken the effect exerted by said air pocket on the sheet 2 and allow the sliding thereof, furthermore the suction force exerted by the suction area 10 would be less.
- the board 3 comprises separation barriers 12 between blowing areas 7 and suction areas 10, arranged adjacent to each side of each conveyor belt 8 on the upper edges 12a of which the sheet is supported during its travel over the board 3, preventing the sheet from adhering to the surface of the board during its forward movement and advantageously allowing the creation of an air pocket with excess pressure between the barriers 12.
- said barriers 12 favor the suction exerted by the second group of bore holes 4b being essentially normal to the surface of the board 3, i.e., towards the sheet 2.
- barriers 12 can be metal barriers made, for example, of stainless steel or of any other rigid material that allows the sliding of the sheets, such as plastic for example.
- the barriers 12 are adhered to the surface of the board 3, although it is possible for them to be press-formed in the actual board 3 or in a metal sheet that is adhered to the surface of the board 3.
- said barriers 12 can be used to discharge the static electricity that can be generated in the sheets 2 due to friction, among others, and safely ground it.
- the separation barriers 12 essentially have the same height as the height by which the conveyor belt 8 protrudes from the board 3, the outer face 8a of the conveyor belts 8 being coplanar with the upper edge 12a of the barriers 12 and allowing a sheet 2 applied against the conveyor belts 8 to be correctly applied against the upper edge 12a of the barriers 12, as shown in Figure 3 , separating the blowing areas 7 from the suction areas 10 of the device 1.
- the upper edge 12a of the barriers 12 is planar in the variant depicted, it could have different shapes that allow suitably separating the suction area 10 from the blowing areas 7, such as a rounded or pointed finish.
- the separation barriers 12 could have a height similar to that of the conveyor belts 8, both the smaller and the larger ones, similar being understood in the context of the invention as that difference in height which allows, due to the effect of the weight of the sheet 2 itself and the suction exerted on the sheet 2, being able to apply it on the barriers 12 by bending it slightly and correctly separating each of the suction areas 10 from the adjacent blowing areas 7. Nevertheless, this difference in height must be small enough so as to prevent having to exert too much suction on the sheet 2 or the latter may be damaged as it is bent. For example, it has been found that a height of the conveyor belt 8 of 1 mm and a height of the barrier 12 of 0.7 mm allow correct conveyance of the sheets 2.
- each sheet 2 is supported only on the upper edges 12a of the barriers 12 and partially adhered to the conveyor belts 8 in the suction areas 10, but separated from the surface of the board 3 by the air pocket of the blowing area 7, the sheet 2 can advantageously travel at the same speed and in the same forward movement direction of the conveyor belts 8, shown by the arrow F.
- the board 3 can have retractable retaining means 16, such as a pair of rods aligned perpendicular to the forward movement direction protruding from the surface of the board 3, in a manner synchronized with the speed of the conveyor belt 8 and, therefore, with the passage of sheets 2, to momentarily retain the sheet 2 without retaining the conveyor belts 8 on which the sheet 2 travels, and the sheet 2 can therefore be squared in the direction perpendicular to the forward movement direction.
- retractable retaining means 16 such as a pair of rods aligned perpendicular to the forward movement direction protruding from the surface of the board 3, in a manner synchronized with the speed of the conveyor belt 8 and, therefore, with the passage of sheets 2, to momentarily retain the sheet 2 without retaining the conveyor belts 8 on which the sheet 2 travels, and the sheet 2 can therefore be squared in the direction perpendicular to the forward movement direction.
- Figure 5 shows a variant of the device 1 comprising four conveyor belts 8, suitable for conveying larger sheets 2.
- the device 1 comprising four conveyor belts 8, suitable for conveying larger sheets 2.
- separation barriers 12 between blowing areas 7 and suction areas 10.
- the number of conveyor belts can be increased to support larger sheets 2, there being able to be six, for example, or even a larger number thereof.
- Figure 6 shows a system 100 formed by three devices 1: a first device 1 a, a second device 1b and a third device 1c, all aligned, the first device 1 a comprising a horizontal board 3 suitable for conveying a sheet 2 horizontally in the direction of the arrow F to the second device 1 b comprising a convex board 3 suitable for conveying the sheet 2 to a third device 1c comprising an inclined board 3.
- the different devices 1 must be aligned so that the conveyor belts 8 of each device 1 can deliver the sheets 2 to the conveyor belts 8 of the next device 1, the sheets 2 suitably being able to travel in the forward movement direction shown by the arrow F.
- the flow of sheets 2 is obtained in a known manner from a stack 101 from which a feeder 102 of the type known in the state of the art sends them one by one to the first device 1 a, which conveys them horizontally to the second device 1 b.
- the second device 1 b allows arranging the sheet 2 in an inclined position suitable for delivering it to the third device 1 c.
- the third device 1 c comprises an inclined board 3, where cavities 15 have been made to allow the retaining means 16 described above to suitably retain each sheet 2, allowing squaring means 103, which are synchronous with the retaining means 16, to square and suitably arrange the sheet 2 for subsequent processing in later steps. After squaring, the sheet 2 is removed by typical conveyor means 104 to be conveyed to the next processing phases.
- FIG. 7 shows a second system 200, an alternative variant of the preceding system, formed by a single device 1 the board 3 of which is formed by three attached board segments 3a, 3b, 3c, the first board segment 3a being horizontal, the second board segment 3b being convex and the third board segment 3c being inclined.
- the conveyor belt 8 which conveys sheets 2 in the direction of the arrow F, does not travel over the entire board 3, but rather returns through a recess 17 made in the board 3, allowing the sheets 2 to fall due to their own weight to retaining means 16 of the type described above, which means can be retracted through cavities 15 made in the board 3 for squaring the sheet 2 similarly to that described in the first system 100.
Abstract
Description
- The present invention describes a device and system for conveying sheets, such as sheets of paper or cardboard, of the type comprising a board provided with bore holes, conveyor belts and blowing and suction means.
- Devices for conveying sheets, such as sheets of paper or cardboard from a stack of sheets where they are separated by means of a feeder to the point where said sheets are handled, are known.
- Devices for conveying sheets provided with narrow conveyor belt-like belts for conveying sheets, provided with upper pressure wheels assuring the proper conveyance of the sheet without shifting with respect to the belts during conveyance are known. Nevertheless, said wheels complicate subsequent handling of the sheet for appropriately squaring it and arranging it in a known position suitable for being able to be handled correctly later, so the end conveyance sector cannot have wheels, the sheet being secured in said end sector only at its rear edge by end wheels. Therefore, said final pressure wheels must be adjusted every time according to the size of the sheet, so they have to be adjusted every time the size of sheet to be handled changes.
- Alternatively, devices provided with a perforated conveyor belt-like wide band, which creates sufficient grip for conveying sheets by means of creating a lower vacuum chamber, are known. Nevertheless this grip makes it difficult to separate the sheet from the band in the end sector for handling, so the pressure exerted by the vacuum chamber on the sheet must be reduced, it being necessary to provide the end conveyance sector with end pressure wheels which must also be adjusted every time the size of sheet to be handled changes.
- Devices like that described in patent document
US5133543 are known, comprising a pair of conveyor belts which creates sufficient grip for conveying the sheets by means of creating a lower vacuum chamber, also having compensation holes preventing the generation of negative pressure between converging conveyor belts, in addition to being able to provide an air baffle to facilitate the lateral travel of the sheets for suitable lateral positioning. - Nevertheless, it is necessary to exert considerable air pressure to obtain an air baffle which allows being able to readily retain the sheet on the conveyor belts in the end conveyor sector for handling.
- An objective of the present invention therefore is to disclose a conveyor device lacking pressure wheels which allows being able to readily retain the sheet on the conveyor belts in the end conveyor sector for handling.
- The device for conveying sheets of the present invention is of the type comprising a board provided with bore holes forming a first and a second series of bore holes; blowing means connected to the first series of bore holes of the board, determining at least one blowing area; at least two conveyor belts arranged such that they slide on said conveyor board in the forward movement direction of the sheets, said conveyor belts being essentially parallel to one another and the gap between conveyor belts comprising a blowing area; and suction means connected to the second series of bore holes of the board, arranged below the conveyor belts, determining suction areas.
- The device is essentially characterized in that the conveyor belts are provided with holes along their entire length which uncover intermittently and during the forward movement of the belt the bore holes of the second series of bore holes, and in that the conveyor board comprises separation barriers between blowing areas and suction areas, arranged adjacent to each side of each conveyor belt on the upper edges of which the sheet is supported during its travel over the board, preventing the sheet from adhering to the surface of the board during its forward movement and allowing the creation of sufficient air baffle to allow being able to readily retain the sheet on the conveyor belts in the end conveyor sector for handling.
- According to another feature of the invention, the separation barriers have a height similar to that of the conveyor belts, allowing the sheet to be supported on the separation barriers, in one variant of interest, the upper edge of the separation barriers being coplanar with the outer face of the conveyor belts, which allow that even though the sheet is made of a rigid material, it is always supported on the separation barriers.
- According to another feature of the invention, the bore holes of the second series of bore holes arranged below the same conveyor belt are aligned, which facilitates being able to be covered and uncovered intermittently by the holes of the conveyor belt.
- In one variant of the invention, the aligned bore holes arranged below the same conveyor belt are separated 10 cm, allowing a sheet of this length to always be arranged on a suction area.
- In another variant of the invention, the distance between adjacent holes of the same conveyor belt is 8 cm, allowing the bore holes of the second series of bore holes arranged below the belt to be constantly covered and uncovered.
- In another embodiment of interest, the bore holes of the second series of bore holes are of the same size as the holes of the conveyor belt, allowing a hole to completely uncover a bore hole when they align, therefore maximizing suction. The holes of the conveyor belt can naturally be larger than the bore holes of the second series of bore holes because the suction force is not affected.
- In one variant of the invention, the device comprises retractable retaining means in the board synchronized with the speed of the conveyor belt and, therefore, with the passage of sheets, for momentarily retaining each sheet, blocking its forward movement, without retaining the conveyor belts on which the sheet is traveling, and thus being able to square the sheet in the direction perpendicular to the forward movement direction of the sheet.
- According to another feature, the board is inclined with respect to the horizontal, allowing the conveyance of sheets at a different height. In some variants of the invention, said inclination of the board is different at different points of said board, being able to determine a convex board, preventing the board from having steep ramps.
- In another embodiment of interest, the device comprises four conveyor belts, allowing the conveyance of sheets of intermediate width.
- In another embodiment, the device comprises six conveyor belts, allowing the conveyance of sheets of greater width.
- The system of the present invention comprises a feeder suitable for obtaining sheets from a stack and at least one device according to the present invention suitable for conveying the sheets obtained from said feeder to squaring means.
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Figure 1 depicts a plan view of the device of the invention; -
Figure 2 depicts a plan view of the board of the device ofFigure 1 ; -
Figure 3 depicts a cross-section view according to section plane AA of the device ofFigure 1 ; -
Figure 4 shows a longitudinal section view according to section plane BB of the device ofFigure 1 ; -
Figure 5 shows a plan view of another variant of the device; -
Figure 6 shows a system comprising three devices; and -
Figure 7 shows a system comprising a device. -
Figures 1 ,3 and4 show different views of adevice 1 forconveying sheets 2 according to the invention. As can be seen, the device comprises aboard 3 made of a rigid material, such as a sheet metal or wood inlaid with stainless steel, on which thesheets 2 are conveyed by means ofconveyor belts 8. In turn, it is possible to form theboard 3 from different sectors of board, attached to one another, to cover the desired path. Thesheets 2 can be semi-rigid, such as sheets of cardboard, or flexible, such as sheets of paper or plastic. In a known manner and as will be shown below, thesheets 2 are obtained from a stack from where they are separated by means of a feeder of the type known in the state of the art, which feeder delivers them to theconveyor device 1 in a staggered manner, adjacent sheets being partially overlapped, or said sheets alternatively being delivered in series, i.e., one by one. It is stressed that when conveyance is staggered, theboard 3 is completely covered by the sheets, there being no gaps between sheets, advantageously achieving better conveyance of said sheets by completely covering the surface of theboard 3, as will be seen below. - Said
sheets 2 must then be conveyed by means of theconveyor belts 8, which are driven in the same direction byrollers 6 to the point where saidsheets 2 must be delivered. - As can be seen, the variant of the invention shown in
Figure 1 comprises twoconveyor belts 8 which are arranged such that they slide on theboard 3 in the forward movement direction of thesheets 2, shown by the arrow F. Saidconveyor belts 8 are essentially parallel to one another so that the direction of conveyance is rectilinear. - As shown in the board of
Figure 2 ,bore holes 4 have been made in saidboard 3 to facilitate conveyance of thesheets 2 by means of theconveyor belts 8. A first and a second series ofbore holes bore holes 4, depending on the functionality of saidbore holes 4, which will be described below. As can be seen inFigure 3 , the first series ofbore holes 4a is connected totypical blowing means 5 by means of blowingducts 13 through which air is expelled through thebore holes 4 forming a blowingarea 7 in which an air pocket is created between aboard 3 and thesheets 2 which are conveyed and pass over thebore holes 4 of the first series ofbore holes 4a, facilitating the sliding of thesheets 2. In the variant shown inFigures 1 ,2 and4 , there is only onecentral blowing area 7, although there can be more blowingareas 7 as will be seen below. Although in this variant the size of thebore holes 4 of the first series ofbore holes 4a and of the second series ofbore holes 4b is the same, in other variants of the invention the sizes may be different to appropriately adjust blowing and suction in each sector of thedevice 1. Naturally, if necessary, thebore holes 4 of the first series ofbore holes 4a may not be aligned, but rather be distributed throughout the entire blowingarea 7 to form a homogenous air pocket. - The second series of
bore holes 4b is connected to typical suction means 9, such as a suction pump or suction turbine, by means ofrespective suction ducts 14, determining asuction area 10 around said second series ofbore holes 4b. - As can be seen in
Figure 1 , theconveyor belts 8 are provided withholes 11 along their entire length, thebore holes 4 forming part of the second series ofbore holes 4b being visible in the detail ofboard 3 ofFigure 2 , advantageously covered below saidconveyor belts 8. - Since the
bore holes 4 of the respective second series ofbore holes 4b which are arranged below thesame conveyor belt 8 are aligned in the same direction as theconveyor belt 8, during the forward movement of theconveyor belt 8 during the conveying process for conveying one orseveral sheets 2, theholes 11 of saidconveyor belt 8 cover and uncover intermittently each of thebore holes 4 of the second series ofbore holes 4b, allowing thesheet 2 traveling over a sector ofconveyor belt 8 to be adhered intermittently and exerting an increasing and decreasing force against the conveyor belt as theholes 11 are eventually aligned with therespective bore holes 4 of the second series ofbore holes 4b during the forward movement of theconveyor belts 8. In the variant depicted inFigures 1 to 4 , the separation betweenconsecutive bore holes 4 of the second series ofbore holes 4b is 10 cm, whereas the separation betweenconsecutive holes 11 is 8 cm. - As can be seen in the variant depicted, the
bore holes 4 of the second series ofbore holes 4b are of the same size as theholes 11 of theconveyor belts 8. In said variant, thealigned bore holes 4 arranged below thesame conveyor belt 8 are separated 10 cm from one another, whereas the distance betweenadjacent holes 11 of thesame conveyor belt 8 is 8 cm, the diameter of both being the same, 2 cm. This difference of distances means that thebore holes 4 close to one another are not covered or uncovered at the same time, but rather with a certain lack of synchronism, favoring eachsheet 2 always being arranged on top of a partiallyuncovered bore hole 4 of the second series ofbore holes 4b. - During the travel of the
conveyor belts 8 on theboard 3, a certain allowance is created between theconveyor belts 8 and the surface of theboard 3. This allowance advantageously allows that when thebore holes 4 of the second series ofbore holes 4b are covered, the suction can be exerted on thesheet 2 through the edges of saidconveyor belt 8. Naturally, the exerted suction and the allowance between theconveyor belts 8 and the surface of theboard 3 must be calculated so as to allow sufficient suction of thesheet 2 without theconveyor belt 8 being affected by said suction, for example being diverted from its course or even becoming jammed. - As described above, the air expelled by the first group of
bore holes 4a in the blowingarea 7 creates an air pocket facilitating conveyance of thesheet 2, nevertheless, it is necessary that this air exiting with certain pressure is not quickly absorbed by thesuction area 10 of the second group ofbore holes 4b, because this would weaken the effect exerted by said air pocket on thesheet 2 and allow the sliding thereof, furthermore the suction force exerted by thesuction area 10 would be less. Advantageously, theboard 3 comprisesseparation barriers 12 between blowingareas 7 andsuction areas 10, arranged adjacent to each side of eachconveyor belt 8 on theupper edges 12a of which the sheet is supported during its travel over theboard 3, preventing the sheet from adhering to the surface of the board during its forward movement and advantageously allowing the creation of an air pocket with excess pressure between thebarriers 12. Similarly, saidbarriers 12 favor the suction exerted by the second group ofbore holes 4b being essentially normal to the surface of theboard 3, i.e., towards thesheet 2. - These
barriers 12 can be metal barriers made, for example, of stainless steel or of any other rigid material that allows the sliding of the sheets, such as plastic for example. As can be seen inFigure 3 , thebarriers 12 are adhered to the surface of theboard 3, although it is possible for them to be press-formed in theactual board 3 or in a metal sheet that is adhered to the surface of theboard 3. Advantageously, when thebarriers 12 are made of an electric conducting material, saidbarriers 12 can be used to discharge the static electricity that can be generated in thesheets 2 due to friction, among others, and safely ground it. - It can be seen in
Figure 3 that theseparation barriers 12 essentially have the same height as the height by which theconveyor belt 8 protrudes from theboard 3, theouter face 8a of theconveyor belts 8 being coplanar with theupper edge 12a of thebarriers 12 and allowing asheet 2 applied against theconveyor belts 8 to be correctly applied against theupper edge 12a of thebarriers 12, as shown inFigure 3 , separating theblowing areas 7 from thesuction areas 10 of thedevice 1. Although theupper edge 12a of thebarriers 12 is planar in the variant depicted, it could have different shapes that allow suitably separating thesuction area 10 from the blowingareas 7, such as a rounded or pointed finish. - Naturally, since the
sheet 2 is made of a somewhat flexible material, theseparation barriers 12 could have a height similar to that of theconveyor belts 8, both the smaller and the larger ones, similar being understood in the context of the invention as that difference in height which allows, due to the effect of the weight of thesheet 2 itself and the suction exerted on thesheet 2, being able to apply it on thebarriers 12 by bending it slightly and correctly separating each of thesuction areas 10 from theadjacent blowing areas 7. Nevertheless, this difference in height must be small enough so as to prevent having to exert too much suction on thesheet 2 or the latter may be damaged as it is bent. For example, it has been found that a height of theconveyor belt 8 of 1 mm and a height of thebarrier 12 of 0.7 mm allow correct conveyance of thesheets 2. - Since each
sheet 2 is supported only on theupper edges 12a of thebarriers 12 and partially adhered to theconveyor belts 8 in thesuction areas 10, but separated from the surface of theboard 3 by the air pocket of theblowing area 7, thesheet 2 can advantageously travel at the same speed and in the same forward movement direction of theconveyor belts 8, shown by the arrow F. Advantageously, since there is no friction between thesheet 2 and the surface of theboard 3, theboard 3 can have retractable retaining means 16, such as a pair of rods aligned perpendicular to the forward movement direction protruding from the surface of theboard 3, in a manner synchronized with the speed of theconveyor belt 8 and, therefore, with the passage ofsheets 2, to momentarily retain thesheet 2 without retaining theconveyor belts 8 on which thesheet 2 travels, and thesheet 2 can therefore be squared in the direction perpendicular to the forward movement direction. To square thesheets 2 in the forward movement direction of thesheets 2, since there is no friction between thesheet 2 and the surface of theboard 3 as described above, it is possible to shift thesheet 2 in the direction perpendicular to the forward movement direction of theconveyor belts 8 easily and without damaging thesheet 2, for example subjecting it to a pushing or clamping force by squaring means as will be shown below. To facilitate theconveyor belts 8 continuing to slide below thesheet 2 while it is retained and the travel of thesheet 2 in a direction perpendicular to the forward movement direction of theconveyor belts 8 is facilitated, the roughness of theconveyor belts 8 as well as the pressure exerted by the blowingareas 7 and thesuction areas 10 must be suitably gauged. Additionally, to achieve this gauging, it is possible to incorporate regulation means, such as shut-off valves, in the blowingducts 13 and in thesuction ducts 14, allowing the opening or closing of those ducts or duct sectors, as appropriate. This arrangement is of particular interest to completely or partially close thesuction ducts 14 associated with the end bore holes 4 of the second series ofbore holes 4b in order to reduce the suction effect and prevent obstructing the squaring means. -
Figure 5 shows a variant of thedevice 1 comprising fourconveyor belts 8, suitable for conveyinglarger sheets 2. In this case, there are blowingareas 7 formed bybore holes 4 of the first series ofbore holes 4a forming air pockets between thedifferent conveyor belts 8. It can also be observed that arranged adjacent to each side of eachconveyor belt 8 there areseparation barriers 12 between blowingareas 7 andsuction areas 10. Similarly, the number of conveyor belts can be increased to supportlarger sheets 2, there being able to be six, for example, or even a larger number thereof. -
Figure 6 shows asystem 100 formed by three devices 1: afirst device 1 a, asecond device 1b and athird device 1c, all aligned, thefirst device 1 a comprising ahorizontal board 3 suitable for conveying asheet 2 horizontally in the direction of the arrow F to thesecond device 1 b comprising aconvex board 3 suitable for conveying thesheet 2 to athird device 1c comprising aninclined board 3. - Naturally, the
different devices 1 must be aligned so that theconveyor belts 8 of eachdevice 1 can deliver thesheets 2 to theconveyor belts 8 of thenext device 1, thesheets 2 suitably being able to travel in the forward movement direction shown by the arrow F. As can be seen inFigure 6 , the flow ofsheets 2 is obtained in a known manner from astack 101 from which afeeder 102 of the type known in the state of the art sends them one by one to thefirst device 1 a, which conveys them horizontally to thesecond device 1 b. Thesecond device 1 b allows arranging thesheet 2 in an inclined position suitable for delivering it to thethird device 1 c. Thethird device 1 c comprises aninclined board 3, wherecavities 15 have been made to allow the retaining means 16 described above to suitably retain eachsheet 2, allowing squaring means 103, which are synchronous with the retaining means 16, to square and suitably arrange thesheet 2 for subsequent processing in later steps. After squaring, thesheet 2 is removed by typical conveyor means 104 to be conveyed to the next processing phases. -
Figure 7 shows a second system 200, an alternative variant of the preceding system, formed by asingle device 1 theboard 3 of which is formed by three attachedboard segments first board segment 3a being horizontal, thesecond board segment 3b being convex and thethird board segment 3c being inclined. In this variant it can be seen that theconveyor belt 8, which conveyssheets 2 in the direction of the arrow F, does not travel over theentire board 3, but rather returns through a recess 17 made in theboard 3, allowing thesheets 2 to fall due to their own weight to retaining means 16 of the type described above, which means can be retracted throughcavities 15 made in theboard 3 for squaring thesheet 2 similarly to that described in thefirst system 100. It is observed inFigure 7 that thesheets 2 travel in the direction of the arrow F in a staggered fashion, the entire surface of theboard 3 being advantageously covered and therefore there being no separation betweensheets 2, preventing the air pocket formed in the blowing areas from being able to escape through the separation between sheets and favoring the suction force exerted in the suction areas directly striking thesheets 2.
Claims (14)
- A device (1) for conveying sheets (2) comprising:- a board (3) provided with bore holes (4) forming a first and a second series of bore holes (4a, 4b);- blowing means (5) connected to the first series of bore holes (4a) of the board, determining at least one blowing area (7);- at least two conveyor belts (8) arranged such that they slide on said board in the forward movement direction of the sheets, said conveyor belts being essentially parallel to one another and the gap between conveyor belts comprising a blowing area;- suction means (9) connected to the second series of bore holes (4b) of the board, arranged below the conveyor belts, determining suction areas (10) characterized in that the conveyor belts are provided with holes (11) along their entire length which uncover intermittently and during the forward movement of the conveyor belt the different bore holes of the second series of bore holes, and in that the conveyor board comprises separation barriers (12) between blowing areas and suction areas, arranged adjacent to each side of each conveyor belt on the upper edges (12a) of which the sheet is supported during its travel over the board.
- The device (1) according to the preceding claim, characterized in that the height of the separation barriers (12) is similar to the height of the conveyor belts (8).
- The device (1) according to the preceding claim, characterized in that the upper edge (12a) of the separation barriers (12) is coplanar with the outer face (8a) of the conveyor belts (8).
- The device (1) according to any one of the preceding claims, characterized in that the bore holes (4) of the second series of bore holes (4b) arranged below the same conveyor belt (8) are aligned.
- The device (1) according to the preceding claim, characterized in that the aligned bore holes (4) arranged below the same conveyor belt (8) are separated 10 cm.
- The device (1) according to any one of the preceding claims, characterized in that the distance between adjacent holes (11) of the same conveyor belt is 8 cm.
- The device (1) according to any one of the preceding claims, characterized in that the bore holes (4) of the second series of bore holes (4b) are of the same size as the holes (11) of the conveyor belts (8).
- The device (1) according to any one of the preceding claims, characterized in that the board (3) is inclined with respect to the horizontal.
- The device (1) according to the preceding claim, characterized in that the inclination of the board (3) is different at different points of said board.
- The device (1) according to the preceding claim, characterized in that the board (3) is convex.
- The device (1) according to any one of the preceding claims, characterized in that it comprises retractable retaining means (16).
- The device (1) according to any one of the preceding claims, characterized in that it comprises four conveyor belts (8).
- The device (1) according to any one of claims 1 to 11, characterized in that comprises six conveyor belts (8).
- A system (100,200) for conveying sheets (2), characterized in that it comprises a feeder (102) suitable for obtaining sheets from a stack (101) and at least one device (1) according to any one of the preceding claims suitable for conveying the sheets obtained from said feeder to squaring means (103).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES201130524A ES2393729B1 (en) | 2011-04-01 | 2011-04-01 | DEVICE AND SYSTEM FOR THE TRANSPORT OF SHEETS. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2505532A2 true EP2505532A2 (en) | 2012-10-03 |
EP2505532A3 EP2505532A3 (en) | 2014-12-10 |
EP2505532B1 EP2505532B1 (en) | 2017-11-22 |
Family
ID=46062200
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12382122.5A Not-in-force EP2505532B1 (en) | 2011-04-01 | 2012-03-30 | Device and system for sheet transportation |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2505532B1 (en) |
ES (2) | ES2393729B1 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2982627A1 (en) * | 2014-08-04 | 2016-02-10 | YSF Machinery Co., Ltd. | Conveying apparatus for conveying paper material |
CN108438969A (en) * | 2018-04-11 | 2018-08-24 | 苏州智码数码科技有限公司 | Weakening transmission mechanism and folding machine including the mechanism |
CN108861705A (en) * | 2018-07-30 | 2018-11-23 | 金湖三木机械制造实业有限公司 | Greatly without foldable ultra-thin materials device for piling sheets |
DE102019118647B3 (en) | 2019-07-10 | 2020-06-10 | Koenig & Bauer Ag | Production line for processing sheet metal |
JP2021094720A (en) * | 2019-12-16 | 2021-06-24 | ブラザー工業株式会社 | Image recording device |
CN113371481A (en) * | 2021-06-16 | 2021-09-10 | 深圳汉华工业数码设备有限公司 | Shaping mechanism and printing system |
WO2021239416A1 (en) | 2020-05-29 | 2021-12-02 | Koenig & Bauer Ag | Production line for processing sheet metal panels |
CN113798107A (en) * | 2021-10-16 | 2021-12-17 | 江苏泰华消防电气设备有限公司 | Automatic processing equipment and processing technology for manufacturing fireproof door |
EP3974360A1 (en) | 2020-09-29 | 2022-03-30 | Koenig & Bauer AG | Production line with a plurality of machine units and a method for operating this production line |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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ES2681961B1 (en) * | 2017-03-17 | 2019-06-27 | Simon Corrugated Machinery S L | Device and procedure for the transport of flexible sheets |
Citations (1)
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US5133543A (en) | 1990-04-26 | 1992-07-28 | Koenig & Bauer Aktiengesellschaft | Sheet conveying apparatus |
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US3889801A (en) * | 1972-10-26 | 1975-06-17 | Bell & Howell Co | Vacuum conveyor belt with air bearing |
DE4012948A1 (en) * | 1990-04-24 | 1991-10-31 | Roland Man Druckmasch | DEVICE FOR PROMOTING PRINTED SHEETS |
US5857605A (en) * | 1995-06-26 | 1999-01-12 | Marquip, Inc. | Vacuum assisted web drive for corrugator double backer |
EP0914285A1 (en) * | 1995-09-08 | 1999-05-12 | Gerber Garment Technology, Inc. | Reduced vacuum hold down system |
DE102004003509B4 (en) * | 2003-02-21 | 2019-04-25 | Heidelberger Druckmaschinen Ag | Device for conveying bows |
DE202004006615U1 (en) * | 2004-04-23 | 2004-08-05 | Man Roland Druckmaschinen Ag | Device for a conveyor table used for transporting sheet material in a sheet-fed rotary printing machine comprises transport belts, and a blowing device blowing air below the sheets in guide regions via ventilation openings |
-
2011
- 2011-04-01 ES ES201130524A patent/ES2393729B1/en not_active Expired - Fee Related
-
2012
- 2012-03-30 ES ES12382122T patent/ES2658340T3/en active Active
- 2012-03-30 EP EP12382122.5A patent/EP2505532B1/en not_active Not-in-force
Patent Citations (1)
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US5133543A (en) | 1990-04-26 | 1992-07-28 | Koenig & Bauer Aktiengesellschaft | Sheet conveying apparatus |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2982627A1 (en) * | 2014-08-04 | 2016-02-10 | YSF Machinery Co., Ltd. | Conveying apparatus for conveying paper material |
CN108438969A (en) * | 2018-04-11 | 2018-08-24 | 苏州智码数码科技有限公司 | Weakening transmission mechanism and folding machine including the mechanism |
CN108861705A (en) * | 2018-07-30 | 2018-11-23 | 金湖三木机械制造实业有限公司 | Greatly without foldable ultra-thin materials device for piling sheets |
CN108861705B (en) * | 2018-07-30 | 2024-01-12 | 金湖三木机械制造实业有限公司 | Ultrathin material processing sheet machine for disposable sanitary products |
DE102019118647B3 (en) | 2019-07-10 | 2020-06-10 | Koenig & Bauer Ag | Production line for processing sheet metal |
JP2021094720A (en) * | 2019-12-16 | 2021-06-24 | ブラザー工業株式会社 | Image recording device |
WO2021239416A1 (en) | 2020-05-29 | 2021-12-02 | Koenig & Bauer Ag | Production line for processing sheet metal panels |
DE102020114531A1 (en) | 2020-05-29 | 2021-12-02 | Koenig & Bauer Ag | Production line for processing sheet metal |
EP3974360A1 (en) | 2020-09-29 | 2022-03-30 | Koenig & Bauer AG | Production line with a plurality of machine units and a method for operating this production line |
DE102020125412A1 (en) | 2020-09-29 | 2022-03-31 | Koenig & Bauer Ag | Device for transporting sheet metal panels coated up to their front edge and/or rear edge related to their transport direction |
CN113371481A (en) * | 2021-06-16 | 2021-09-10 | 深圳汉华工业数码设备有限公司 | Shaping mechanism and printing system |
CN113798107A (en) * | 2021-10-16 | 2021-12-17 | 江苏泰华消防电气设备有限公司 | Automatic processing equipment and processing technology for manufacturing fireproof door |
Also Published As
Publication number | Publication date |
---|---|
ES2393729A1 (en) | 2012-12-27 |
ES2393729B1 (en) | 2013-11-04 |
EP2505532B1 (en) | 2017-11-22 |
EP2505532A3 (en) | 2014-12-10 |
ES2658340T3 (en) | 2018-03-09 |
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