STACKING MACHINE FOR HANDLING INDIVIDUAL SHEETS AND A SHEET DISPENSING SYSTEM FOR PROVIDING INDIVIDUAL SHEETS

Abstract

The present invention relates to a method of stacking individual sheets and a stacking machine for handling individual sheets, the stacking machine comprising a frame assembly (13) including support columns (711, 811) for supporting the delivery station (70), the transfer station (80) and the elevation station (82). The delivery station has a delivery table and the transfer station including a handling arm (85) is movable from a first position above the delivery table to a second position above the elevation station. The handling arm includes a holding member (86) for contacting the sheets individually and transferring the sheets individually from the delivery table to the elevation station and releasing the sheets individually at the elevation station. The elevation station has a platform for collecting the individual sheets and the platform is moved vertically from a first level to a second level for allowing the sheets to be stacked on top of the one another.

Claims

1-16: (canceled)

17. A stacking machine for handling individual sheets, the stacking machine comprising: a frame assembly including a plurality of support columns; a delivery station supported by at least some of the plurality of support columns and having a delivery table defining a first horizontal plane, wherein the delivery table is configured for receiving and presenting the sheets individually; a transfer station supported by at least some of the plurality of support columns and including a handling arm that is movable from a first position above the delivery table to a second position above a receiving area, the handling arm including holding members configured for contacting the sheets individually, for transferring the sheets individually from the delivery table to the receiving area, and for releasing the sheets individually at the receiving area.

18. The stacking machine of claim 17, wherein the handling arm is suspended by the frame assembly, the handling arm resting on at least some of the plurality of support columns at one end and being connected to the delivery station at an opposite end, whereby the transfer station spans the width of the delivery station.

19. The stacking machine of claim 18, wherein the transfer station includes a gantry that spans at least half a dimension of the delivery station perpendicular to the width of the delivery station, and that is movable along the width of the delivery station.

20. The stacking machine of claim 17, wherein the transfer station comprises a vertical support column connected to the frame assembly, and wherein the handling arm is pivotally connected to the vertical support column and is vertically displaceable in relation to the vertical support column.

21. The stacking machine of claim 17, further comprising a receiving assembly arranged in the receiving area and having a platform configured for collecting the individual sheets.

22. The stacking machine claim 17, wherein each of the holding members includes vacuum lifters located at the perimeter of the handling arm, wherein the vacuum lifters are configured for transferring the sheets.

23. The stacking machine of claim 21, wherein the receiving assembly includes a linkage mechanism that supports the platform and that is configured for enabling the platform to be moved vertically from a first level to a second level, the first level being substantially in the same horizontal plane as the first horizontal plane of the delivery table, and the second level being located parallel with and below the first horizontal plane of the delivery table, so as to allow the sheets to be stacked on top of the one another, and wherein the linkage mechanism is connected to an actuator.

24. The stacking machine of claim 17, wherein the transfer station is connected to a controller that is configured for allowing operation of the transfer station in communication with at least one of the delivery station and the receiving assembly.

25. The stacking machine of claim 17, wherein the delivery station includes a sensor arranged for detecting the presence and location of an individual sheet being received on the delivery table defining a first horizontal plane.

26. The stacking machine of claim 17, further comprising a sheet dispensing system configured for dispensing individual sheets, the sheet dispensing system comprising: a second frame assembly supporting a reel loading station, a sheet dispenser station, and the delivery station; the reel loading station comprising a supply reel containing a supply of cellulose fiber-based web, and a reel support configured for supporting the supply reel and for allowing the dispensing of the cellulose fiber-based web from the supply reel; the sheet dispenser station including a feeding mechanism and a cutting mechanism, the feeding mechanism configured for receiving the cellulose fiber-based web from the reel loading station and including a tension roller and a feeding roller; the cutting mechanism including a reciprocating cutter assembly configured for (a) cutting the cellulose fiber-based web into individual sheets when the cutter assembly is moved transversally relative to the cellulose fiber-based web from a first position to a second position at opposite sides of the cellulose fiber-based web, and (b) being prevented from cutting the cellulose fiber-based web when the cutter assembly is moved from the second position to the first position; and the delivery station including a delivery table connected to the sheet dispenser station and configured for receiving the individual dispensed sheets; wherein one of the reel loading station, the sheet dispenser station, and the delivery station further comprises a smoothing mechanism including a first guide roller and second guide roller, the first and second guide rollers being adjustable in relation to one another for altering a smoothing angle in response to changes in diameter of the supply of cellulose fiber-based web on the supply reel in order to compensate for changes in curvature of the supply of cellulose fiber-based web, thereby to provide non-curved individual sheets.

27. A method of stacking individual sheets, the method comprising the steps of: (a) providing a stacking machine including a delivery station and a transfer station, the delivery station having a delivery table defining a first horizontal plane, the transfer station including a handling arm; (b) providing a receiving assembly having a platform configured for collecting the individual sheets; (c) delivering the sheets individually onto the delivery table; (d) moving the handling arm from a first position above the delivery table to a second position above the receiving assembly; (e) activating the holding members to contact each of the sheets individually; (f) transferring the sheets individually from the delivery table to the receiving assembly; (g) releasing the sheets individually at the receiving assembly; (h) moving the platform vertically from a first level to a second level, the first level being substantially in the same horizontal plane as the first horizontal plane of the delivery table, and the second plane level located parallel with and below the first horizontal plane, whereby the sheets are allowed to be stacked on top of the one another.

28. The method of claim 27, wherein, in the step (c) of delivering, the sheets are delivered continuously on the delivery table; and wherein in the step (f) of transferring, the sheets are individually transferred from the delivery table to the receiving assembly synchronized with the sheets being delivered individually to the delivery table.

29. The method of claim 27, wherein, in the step (c) of delivering, the sheets are delivered intermittently on the delivery table, and wherein the step (f) of transferring comprises the steps of: (f)(1) detecting the presence of sheets on the delivery table; and (f)(2) transferring the sheets on the delivery table to the receiving assembly by stopping the delivery of the sheets during the step of transferring the sheets to the receiving assembly.

30. A method of stacking individual sheets the method comprising the steps of: (a) providing a stacking machine including a delivery station and a transfer station, the delivery station having a delivery table defining a first horizontal plane, the transfer station including a handling arm including holding members, the stacking machine further comprising a reel loading station and a sheet dispenser station; wherein the reel loading station includes a supply reel containing a supply of a cellulose fiber-based web; wherein the sheet dispenser station includes a feeding mechanism and a cutting mechanism, the feeding mechanism having a tension roller and a feeding roller, the cutting mechanism including a reciprocating cutter assembly; (b) providing a receiving assembly having a platform configured for collecting the individual sheets; (c) providing a smoothing mechanism having a first guide roller and a second guide roller at one of the reel loading station, the sheet dispenser station, and the delivery station; (d) dispensing the cellulose fiber-based web to the feeding mechanism from the reel loading station; (e) cutting the cellulose fiber-based web by moving the reciprocating cutter assembly transversally relative to the cellulose fiber-based web from a first position to a second position at opposite sides of said cellulose fiber based web, and preventing cutting when the reciprocating cutter assembly is move from the second position to the first position; (e) adjusting at least one of the first guide roller and the second guide roller to alter a smoothing angle depending on the diameter of the supply of the cellulose fiber-based web on the supply reel in order to compensate for the curvature of the supply of the cellulose fiber-based web on the supply reel, thereby to provide non-curved individual sheets; (f) dispensing the individual sheets onto delivery table of the delivery station; (g) moving the handling arm from the first position to the second position; (h) activating the holding members of the handling arm to contact the sheets individually; (i) transferring the sheets individually from the delivery table to the receiving area with the handling arm; (j) activating the holding members to release the sheets individually onto the platform; and (k) moving the platform vertically from a first level to a second level, the first level being substantially in the same horizontal plane as the first horizontal plane of the delivery table, and the second level being located parallel with and below the first horizontal plane for stacking the individual sheets on top of the one another.

Description

DETAILED DESCRIPTION

[0099] The invention will now be explained in detail with reference to the schematic drawings in which:

[0100] FIG. 1 is an overall schematic and perspective view of an embodiment of the sheet dispensing system for dispensing and supplying individual sheets of paper or cardboard.

[0101] FIG. 2A is a perspective view of an embodiment of the sheet dispenser station with the cutting mechanism.

[0102] FIG. 2B is a close up view of FIG. 2A of the cutting mechanism of an embodiment of the sheet dispenser station.

[0103] FIG. 2C is a perspective view of an embodiment of the sheet dispenser station with the cutting mechanism according to a first aspect of the present invention.

[0104] FIG. 3A is a perspective view of an embodiment of the reel loading station and the sheet dispenser station with the smoothing mechanism and the feeding mechanism for dispensing individual sheets of paper or cardboard.

[0105] FIG. 3B is a close up view of FIG. 3A of the smoothing mechanism and the feeding mechanism of a first presently preferred embodiment of the sheet dispenser station.

[0106] FIG. 4A-4D shows perspective view of the smoothing mechanism.

[0107] FIG. 5 is a perspective view of the reel loading station with a third preferred embodiment of the smoothing mechanism connected to the reel loading station according to a third aspect of the present invention.

[0108] FIG. 6A shows the loading of a supply reel in the reel loading station with the smoothing mechanism according to a third aspect of the present invention.

[0109] FIG. 6B-6D shows the unrolling of material from the supply reel in the reel loading station with a third preferred embodiment of the smoothing mechanism connected to the reel loading station according to a third aspect of the present invention.

[0110] FIG. 7A-7C shows the unrolling of material from the supply reel in the reel loading station with a fourth preferred embodiment of the smoothing mechanism according to a fourth aspect of the present invention.

[0111] FIG. 8A-8D shows the unrolling of material from the supply reel in the reel loading station according to a fifth aspect of the present invention.

[0112] FIG. 9A-9D shows the unrolling of material from the supply reel in the reel loading station according to a sixth aspect of the present invention.

[0113] FIG. 10A-10C shows a perspective of the stacking machine having a vertical support column.

[0114] In FIG. 1, a first and presently preferred embodiment of a system for providing sheets of paper or cardboard (cellulose fiber based material) is shown designated the reference numeral 10 in its entirety. The system 10 comprises a reel loading station 20, a sheet dispenser station 40, a controller 90 and a delivery station 70. The cellulose fiber based material in the form of paper or cardboard is unrolled from the supply reel 22 and introduced to the sheet dispenser station 40. The sheet dispenser station 40 (hereafter referred to as the sheet dispenser) comprises a feeding mechanism 50 (not shown in FIG. 1) enabling the supply of paper or cardboard to be drawn through the sheet dispenser station 40, where the paper or cardboard is cut into the sheet 28, which will be dispensed onto the delivery table 71. The individual sheets 28 shown in FIG. 1 are cut both in the transverse direction and in the longitudinal direction. The paper or cardboard would be referred to as cellulose-based material.

[0115] From FIG. 1 it can be seen, that the cellulose fiber based material would travel over a number of roller 12, which would allow the cellulose fiber based material to be transferred between the different unit of the sheet dispensing system. Through the use of a number of roller 12, the different unit would not have to be located in close vicinity of each other, which would be advantageous as the sheet dispensing system could be fitted into different production facilities, where the area of the ground floor could be utilized for other purpose.

[0116] The reel loading station 20 comprises a supporting frame 14 for the supply reel 22 of paper or cardboard. The supporting frame 14 is shown in an embodiment, where the supporting frame 14 would consist of four supporting columns 21, where the supply reel 22 has an axle penetrating the centre of the supply reel and where the weight of the supply reel is supporting the two supporting columns. The supply is supported in a manner that allows the supply reel to rotate freely around the centre axle. The reel loading station is intended to be operated in a stepwise manner, allowing continuous feeding of the cellulose fiber based web to the sheet dispenser station, where the continuous feeding is stopped when the cutting of the cellulose fiber based web is performed.

[0117] The cutting could also be performed without stopping the dispensing of the cellulose fiber based web from the sheet dispensing station, this would however require that the cutting mechanism is provided on a movable unit. This provides an “on the fly” operation mode.

[0118] The reciprocating cutter is shown as a mechanical cutter, more precisely a mechanical roller knife. Instead of using a reciprocating cutter, e.g. a mechanical knife, it would also be possible to provide a laser cutter and enabling a continuous cutting of the cellulose fiber material, which in this case would be supplied continuously during the cutting process.

[0119] As can be seen in FIG. 1, the reel loading station 20 further comprises a supporting roller 25, which is suspended from the supporting frame 14, the supporting roller 25 is preferably pivotally suspended from the supporting frame 14 by means of a two support arms 27, whereby the supporting rollers 25 are able to arrest on the circumference of the supply reel 22. The supporting roller 25 comprises a reel sensor 26, which is able to send data of the position of the supporting roller 25 to a controller 90 interconnected with a computer 94. As depicted in FIG. 1 the supporting rollers could further be provided with fingers 251. The reel sensor can be any type of sensor, which can be used for the purpose of generating an electrical signal, which can be used to indicate or determine a position, e.g. a potentiometer.

[0120] The sheet dispensing system 10 comprises a controller 90, which is interconnected with the reel loading station via cables 92 and where the controller 90 comprises an input channel and an out channel. The controller 90 receives signals from the reel sensor 26 connected to said reel loading station 20 and from the collected data from the reel sensor 26, the collected data is used to determine the diameter of the supply reel 22.

[0121] The collected data from the reel sensor 26 is used to adjust the position of the guide roller (not shown) of the smoothing mechanism 100, whereby the smoothing mechanism is adjusted in order to ensure the sufficient amount of smoothing for the paper based material.

[0122] As shown in FIG. 1, the smoothing mechanism 100 is a dependent unit of the sheet dispensing system, which can be connected to either the sheet dispenser station, the delivery table or the reel loading station, which is reflected in the figure.

[0123] FIG. 2A shows the sheet dispenser station 40 including the cutting mechanism 60 and the feeding mechanism 50 (not shown) in a presently preferred embodiment of a system for providing layer of paper or cardboard according to a first aspect of the present invention. The feeding mechanism 50 and the cutting mechanism 60 will be explained in more details in relation to FIG. 3B. The sheet dispenser station includes feeding means for drawing in the cellulose fiber based material from the supply reel 22. The feeding mechanism 50 comprises two rollers, which interact in mutual operation, allowing a free end of the cellulose fiber based material to be placed between the mutually interacting rollers, whereby the cellulose fiber based material can be drawn into the sheet dispenser station 40.

[0124] The sheet dispenser station 40 is connected to the delivery station 70, which comprises a delivery table 71 onto which the cut sheets are delivered and a transfer station 80 located at the end of the delivery table 71, so that the sheets 28 can be transferred from the delivery table 71 on the pallet 83. The delivery table 71 arrests on an underframe 710 with supporting columns more precisely four supporting columns 711, which can be adjusted to level out the delivery table 71 on the ground floor of the production facilities.

[0125] In FIG. 2A, a stacking machine for handling individual sheets 28 is shown, said stacking machine comprising a frame assembly 13, a delivery station 70, and a transfer station 80 for transferring sheets 28 individually from the delivery station 70 to a receiving area 81. The frame assembly 13 includes support columns 711, 811 for supporting said delivery station 70 and said transfer station 80. The delivery station 70 has a delivery table 71 defining a first horizontal plane. The handling arm 85 is used for transferring the sheet 28 from the delivery table 71 onto the platform such as a pallet (not shown), where the sheets can be stacked, and the delivery table 71 serves to receive and present the sheets 28 individually. The handling arm 85 is movable from a first position above the delivery table 71 to a second position above the receiving area 81 and the handling arm 85 includes holding members 86 for contacting the sheets 28 individually and transferring the sheets 28 individually from the delivery table 71 to a position above the receiving area 81 and releasing the sheets individually at the receiving area 81.

[0126] The handling arm 85 is suspended by the frame assembly 13, and the handling arm 85 is resting on supporting columns 811 at one end, and being connected to the delivery station in the opposite end, allowing the transfer station 80 to span the width of the delivery station 70. The handling arm 85 is provided with holding members 86 being constituted by vacuum lifters, located at the perimeter of the handling arm, and the vacuum lifters being used for transferring the sheets. The vacuum lifters may be connected to a pneumatic system (not shown).

[0127] The transfer station 80 includes a gantry 84 which in the illustrated embodiment, spans substantially half the dimension of the delivery station 70 perpendicular to the width thereof, and being movable along the delivery station 70 and above the receiving area 81.

[0128] The gantry 84 spans the width of the transfer station 80 and substantially half of the length of the delivery table. The gantry 84 can also be connected to the controller 90, which would allow for operation of the gantry 84 in connection or communication with the sheet dispenser station, delivery table and the gantry 84.

[0129] The controller can be operated for the purpose of synchronizing the operation of the different stations of the dispensing system including the stacking machine.

[0130] The controller can be programmed to deliver the sheets 28 continuously on the delivery table 71 in order to transfer the sheets 28 individually from the delivery table 71 to the a position above the receiving area 81 before the next sheet 28 being delivered to the delivery table 71.

[0131] The controller can be programmed to deliver the sheets 28 intermittently on the delivery table 71, detecting the presence of the sheets 28 and transferring the sheets 28 from the delivery table 71 to a position above the receiving area 81 and stopping the delivering of the sheets 28 during the step of transferring the sheets 28 to a position above the receiving area.

[0132] In FIG. 2A, the delivery table 71 includes one or several conveying means 72, which will ensure that the individual sheets 28 of the cellulose fiber based material are advanced from the cutting mechanism 60 in the longitudinal direction of the delivery table. The conveying means 72 could be in the form of conveyer belts, which will move the individual sheets on the delivery table 71 after the cellulose fiber based material has been cut by the cutting mechanism 60. The conveyer belts will stretch out the individual sheets on the delivery table 71 after the cellulose fiber based material (web). The delivery station 71 includes a sensor 74, and the senor 74 is used for detecting the presence and location of the sheets. A number of sensors can be arranged on the delivery table in between the conveyer belts. The sensor(s) could also be in combination with the controller for adjusting the guide rollers of the smoothing mechanism.

[0133] In FIG. 2B can be seen that the cutting mechanism 60 of the sheet dispenser station 40 includes a reciprocating cutter, preferably a mechanical cutting knife 61, which serves to cut the cellulose fiber based web from the supply reel 22 into pieces of sheets having a convenient size when they are fed to the delivery table 71. The cutting knife 61 is oriented transversely of the longitudinal direction of the delivery table 71 for cutting off the part of the cellulose fiber based web 23 having its end drawn forth a suitable length. The cutting knife 61 is in the shown embodiment a mechanical roller knife mounted on a guided sledge 63, on which the knife 61 can freely rotate around it centre. The sledge 63 is able to move in the transverse direction of the longitudinal direction of the delivery table 71 and the sledge 63 is guided by two guide rods 62, where the bushings 64 are in interposition between the two outer guide rods 62 and the sledge 63. The cutting knife 61 can be moved pulling the cable 65 or by other similar means to drag the roller knife back and forth.

[0134] FIG. 2C illustrates a similar embodiment as shown in FIG. 2A. In FIG. 2C, the receiving assembly 82 is illustrated as a linkage mechanism 821, preferably a scissor mechanism 821, enabling a platform to be moved between first and second levels and the linkage mechanism being connected to an actuator (not shown).

[0135] The platform 83 (illustrated as a pallet) may be moved vertically from a first level to a second level and the first level is substantially in the same horizontal plane as the first horizontal plane of the delivery table 71, and the second plane is located in parallel with and below the first horizontal plane for allowing the sheets 28 to be stacked on top of the one another.

[0136] FIG. 3A shows a preferred embodiment of the reel loading station 20 and the sheet dispenser station 40 with the smoothing mechanism 100 for dispensing individual sheets of paper based material. The reel loading station 20 is where the cellulose fiber based web 23 is fed to the sheet dispenser station 40. The reel loading station 20 includes an underframe 211 for supporting the supply reel 22, which is rotatably suspended on the underframe 211 having four castor wheels 213. The underframe 211 is equipped with bushings 212, which support the through going axle of the supply reel 22. The through going axle of the supply reel 22 is furthermore locked relative to the underframe by a stop ring (not shown).

[0137] FIG. 3B shows a close up view of the smoothing mechanism 100 and the feeding mechanism 50 of the first presently preferred embodiment of the sheet dispenser station according to a first aspect of the present invention, where the feeding mechanism 50 comprises interspaced rollers (51,52), which are synchronously driven by using a belt. The free end of the cellulose fiber based web 23 is fed to the cutting station 60, where the cutting knife 61 cuts the cellulose fiber based web into individual sheets 28 (intermediate layer).

[0138] The sheet dispenser station 40 comprises a housing 41 having two housing covers 42, a top wall 43, bottom wall 44, two side walls 45 and side wall covers 46. The two housing covers 42 are both located in the longitudinal direction of the dispensing direction of the cellulose fiber based web 23 and the housing covers 42 are hinged to the top wall 43 of the dispenser housing 41, which will provide accesses to the interior of the sheet dispenser station for the operator.

[0139] In FIG. 3B, the feeding mechanism 50 comprises two interspaced rollers (51,52), where the first roller is a tension roller 51, which can be moved by operating the handle 53, whereby movement of the tension roller 51 is obtained. The tension mechanism of the feeding mechanism 50 is achieved by a movable tension roller 51 and a feeding roller 52, which are arranged and connected to the side walls 45 of the sheet dispenser station housing 41. The tension roller 51 is connected in each end to a linkage mechanism 54, where the linkage mechanism 54 itself is connected to the side walls 45 of the sheet dispenser station housing 41. Each linkage mechanism 54 penetrates an opening in the housing covers 42 allowing the operator to grab the tensioning handle 53 on each of the linkage mechanisms 54. By operation of the tensioning handle 53, the tension roller 51 can be moved or be disconnected from engagement with the feeding roller 52, depending on whether or not the free end of the cellulose fiber based web is to be inserted into the feeding mechanism 50.

[0140] The tension roller 51 and the feeding roller 52 constitute the main elements of the feeding mechanism. The feeding roller 52 is connected by means of a belt to a motor 47 in each end, and the elements are covered by side wall covers 46. The motor 47 is located in the upper part of the sheet dispenser station housing 41 and will, when activated, rotate the feeding roller 52, which in cooperation with the tension roller 51 will guide and dispense the cellulose fiber based web through the sheet dispenser station 40.

[0141] An emergency stop 25 is provided on the sheet dispenser station housing 41. The sheet dispenser station 40 may also include means to apply a coating to the cellulose-based material.

[0142] The smoothing mechanism 100 in FIG. 3A and FIG. 3B is shown according to a first aspect of the present invention, where the smoothing mechanism 100 is connected to the side wall 45 of the sheet dispenser station housing 41. The smoothing mechanism 100 comprises a guide plate 33 and two guide rollers, which would be referred to as a first guide roller 31 and a second guide roller 32. The first guide roller 31 and second guide roller 32 are both mounted on a guide plate 33, which is pivotally connected to a mounting plate 34 connected with the side wall 45 of the sheet dispenser station housing 41.

[0143] The mounting plate 34 is provided with an arc portion having a number of slots 35 extending the width of the mounting plate 34, where the slots 35 are arranged near the circumference of the arc shape of the mounting plate 34. A lever 36 with biasing means is arranged perpendicular on the guide plate 33, where the lever 36 is provided with a pin being substantially longer than the width of the guide plate 33. This will allow the lever 36 to provide an interlocking of the guide plate 33 relative to the mounting plate 34.

[0144] The guide plate 33 is pivotally connected to the mounting plate 34, so that the pivot axis of the mounting plate 34 is coincident with the longitudinal axle of the second guide roller 32. In this way, the distance between the longitudinal axis of the feeding roller 52 and the longitudinal axis of the second guide roller 32 is maintained during the advancing process of the cellulose fiber based web (intermediate sheet layer).

[0145] In FIG. 3A and FIG. 3B, the smoothing mechanism 100 is shown in a position, where the smoothing mechanism is raised to the highest possible position in relation to the sheet dispenser station. In the highest position, the lever 36 is inserted in the slot at the highest position on the circumference of the arc portion of the mounting plate 34, this point would be located at the longest distance from the ground floor.

[0146] The amount of smoothing of the cellulose fiber based web is determined by the number of slots provided in the sheet dispenser station 40, more precisely by the number of slots provided in the mounting plate 34 of the sheet dispenser station, which is decisive for the position of the first guide roller 31, and thereby the angular position of the first guide roller 31 in relation to the second guide roller 32 of the smoothing mechanism 100.

[0147] When the smoothing mechanism 100 is fixed in the highest possible position, then the contact area between the paper web and the guide rollers 31, 32 is at its maximum level, whereas when the smoothing mechanism is lowered by a pivoting movement around the axis of the second guide roller, then the contact surface between the cellulose fiber based web and the guide rollers 31, 32 is at its minimum level.

[0148] The number of slots provided in the mounting plate 34 of the sheet dispenser station, allows for at a stepwise adjustment for the smoothing mechanism. Another embodiment of the smoothing mechanism 100 is shown in FIG. 1, where the adjustment can be performed in a continuous manner, through the use of one actuator connected to the frame of the sheet dispensing system, and where the adjustment is achieved in cooperation with a curved recess in a guidance plate connected to the frame of the sheet dispensing system.

[0149] The smoothing angle is the angle, which is established by the position of the guide rollers, e.g. in FIG. 3A. The smoothing angle is opposite the convex arc or the tangent line for the guide roller. The smaller the smoothing angle is, the larger the contact surface would be, hereby the contact surface of the cellulose fiber based web with the guide roller of the smoothing mechanism would be larger.

[0150] FIG. 4A-4B shows the smoothing mechanism 200 according to a second aspect of the present invention, where the smoothing mechanism 200 can be positioned below the cutting section of the sheet dispenser station (not shown). The smoothing mechanism 200 comprises four guide rollers 210a, 210b, 212 having each guide rollers connected in the end to main frame 214. The main frame 214 comprises two frame plates 218a, 218b, which are interconnected in one end allowing the two frame plates 218a, 218b to be pivotable around a common pivot axis. The cellulose fiber based web 23 is fed through the smoothing mechanism 200 and dependent on the amount upon the thickness and density of the cellulose fiber based web, the frame plates 218a, 218b will be clamped together, whereby the secondary guide roller 212 on the second frame plates 218b will be interposed between the two primary guide roller 210a on the first frame plate 218a.

[0151] FIG. 4C-4D shows the smoothing mechanism 200 in the position, where the primary guide roller 210a on the first frame plate 218a and the secondary guide roller 212b on the second frame plates 218b are fully engaged in order to achieved the maximum compensation for an unwanted curvature of the cellulose fiber based web 23. The amount of smoothing can be adjusted by movement of the secondary guide roller 212 on the second frame plates 218b relative to the two primary guide rollers 210a on the first frame plate 218a.

[0152] In FIG. 5, the smoothing mechanism 300 reel loading station 302 is shown according to a third aspect of the present invention, where the smoothing mechanism 300 is connected to the reel loading station 302. The connection of the smoothing mechanism 300 is obtained through the use of linkage rods 311, where a pair of linkage rods 311 are used for suspending the first guide roller 312 and the second guide roller 314 in each end. Each linkage mechanism comprising two linkage rods 311 are interconnected by a linkage lever 316 and the linkage rods 311 are in one end connected to the underframe 310. The first linked rod 311a is connected to the first guide roller 312 in the end opposite the end connected to the underframe 310. The second linked rod 311b is connected to the second guide roller 314 in the end opposite the end connected to the underframe 310. The first guide rollers 312 will arrest on the circumference of the supply reel 22.

[0153] FIG. 5-6D shows the smoothing mechanism 300 according to a third aspect of the present invention. A supply reel 22 is loaded in the reel loading station 302 and the supply reel 22 is supported by bushing 318 located on the underframe 310 for supporting the supply reel 22, which is rotatable suspended on the underframe 310 having four castor wheels 315. The underframe 310 is equipped with bushings 318, which support the through going axle of the supply reel 22 and the axle of the through going axle of the supply reel 22 is furthermore locked relative to the underframe by a locking element 317.

[0154] FIG. 6B-6D shows the sequence of unrolling the cellulose fiber based web 23 from the supply reel 22 in the reel loading station 302. The smoothing mechanism 300 works in dependency of the diameter of the supply reel 22. The first guide roller 312 and the second guide roller 314 will during unrolling of the cellulose fiber based web 23 from the supply reel 22 be adjusted in relation to one another, which would alter the smoothing angle dependent of the diameter of said supply reel in order to compensate for the curvature of said individual sheets and provide non-curved individual sheets.

[0155] When comparing FIG. 6B, which shows the fully loaded supply reel 22 and FIG. 6D, which shows a supply reel after the majority of the cellulose fiber based web 23 has been rolled off the supply reel 22, it is furthermore possible to see that the second guide roller 314 has moved from a first position (initial) behind the first guide roller 312 in the vertical plane to a second position being in front of the first guide roller 312 in FIG. 6D.

[0156] FIG. 7A-7C shows a principle drawing of a fourth preferred embodiment of the smoothing mechanism 400 according to a fourth aspect of the present invention. The reel loading station is connected to the reel loading station, however not shown in FIG. 7A-7C for the sake of simplicity. The smoothing mechanism 400 comprises a supporting frame, supporting rollers 410, a pair of first guide rollers 412 and one second guide roller 414, the pair of first guide rollers 412 being connected to the supporting frame, where the first guide rollers 412 are positioned with a distance in between one another. The supporting frame comprises a recess 416 extending between the first guide rollers 412 in a direction being perpendicular to the distance between the two first guide rollers 412. A second guide roller 112 is provided and positioned in the recess 316 of the supporting frame, and the second guide roller 414 is moved between a first position to a second position.

[0157] FIG. 7A shows the second guide roller 414 in the first position, where the second guide roller 414 applies a minimum of force to the cellulose fiber based web 23. FIG. 7C shows the second guide roller 414 in the first position, where the second guide roller 414 applies a maximum force to the cellulose fiber based web 23.

[0158] By increasing the engagement of the second guide roller 414 in relation to the two first guide rollers it is possible to alter the smoothing angle in dependency of the diameter of said supply reel 22. The smoothing mechanism 400 is connected to a frame by using a linkage mechanism similarly to mechanism shown in FIG. 6A-6D. By using two linkage rods, it is possible to suspend the smoothing mechanism enabling a motion pattern as shown in the FIG. 7A-7C. The linkage mechanism could be implemented by having a first linkage rod connected to the first guide roller 412 and a second linkage rod connected to the second guide roller 414. The first and second linkage rod would be connected to the frame assembly.

[0159] FIG. 8A-8D shows the unrolling of cellulose fiber based web 23 from the reel in the reel loading station according to a fifth aspect of the present invention. The smoothing mechanism 500 works in dependency of the diameter of the supply reel 22. The cellulose fiber based web 23 will be unrolled and drawn by feeding mechanism onto the delivery table 506 and the feeding mechanism comprises a first roller 502 and a second roller 504. The cutting mechanism is not shown in FIG. 8A-8D. The smoothing comprises a guide roller 508, which will be moved along the circumference of the supply reel 22 during unrolling of the cellulose fiber based web 23 from the supply reel 22 and the motion of the guide roller 508 will alter the smoothing angle 510 in dependency of the diameter of said supply reel. The guide roller 508 is moved from a first position (initial) shown in FIG. 8A to a second position shown in FIG. 8D. The first position being behind the rotation centre of the supply reel 22 (the left side of the rotation centre) and a second position being in front of rotation centre of the supply reel 22 (the right side of the rotation centre). The smoothing angle 510 is adjusted by moving the guide roller 508 along the circumference of the supply reel 22 and by changing the smoothing angle 510 it is possible to compensate for the curvature of the cellulose fiber based web 23 and provide non-curved individual sheets.

[0160] FIG. 9A-9D shows the unrolling of the cellulose fiber based web 23 from the reel in the reel loading station according to a sixth aspect of the present invention. The smoothing mechanism 600 works in dependency of the diameter of the supply reel 22. The smoothing mechanism 600 comprises a first guide roller 610 and a second guide roller 612 being adjustable in relation to one another. The cellulose fiber based web 23 will be unrolled and drawn by a feeding mechanism onto the delivery table 601 and the feeding mechanism comprises a first feeding roller 604 and second feeding roller 605. The cutting mechanism is not shown in FIG. 9A-9D. The first guide roller 610 and the second guide roller 612 is connected to a frame facilitating that the first guide roller 610 and the second guide roller 612 can rotate around a common axis 606 from a first position (initial) shown in FIG. 9A to a second position shown in FIG. 9D. In a first position, the smoothing angle is substantially 180 degrees and the gravity centre of the first guide roller 610 and second guide roller 612 defines a plane being substantial parallel with the horizontal plane of the delivery table 601. The smoothing angle 608 is adjusted by rotating the guide rollers 610, 612 around the common axis 606 and by changing the smoothing angle 608 it is possible to compensate for the curvature of the cellulose fiber based web 23 and provide non-curved individual sheets.

[0161] The solution shown in the FIG. 9A-9D provides and allows for a continuous and stepless operation of the sheet dispenser system. Besides being able to compensate for the curvature of the cellulose fiber based web 23 fed from the supply station. It is furthermore possible to have a number of sensors arranged in the delivery table 601, where the sensors are able to detect the curvature of the cellulose fiber based web 23 for allowing an “on the fly” operation mode, that provides for compensation of the curvature at a specific location.

[0162] In this way it is possible to provide a second compensation for the individual sheets, if the smoothing of the cellulose fiber based web 23 was not sufficient to straighten the sheets after being dispensed from the sheet dispenser station.

[0163] The compensation can be performed independently of the smoothing mechanism or in cooperation with the sheet dispenser station and/or the supply station. The smoothing mechanism shown in FIG. 9A-9D could also be combined with the sheet dispenser station, where the smoothing mechanism shown in FIG. 1-3b is removed and the only smoothing is performed by the smoothing mechanism shown in FIG. 9A-9D.

[0164] FIG. 9A shows a positioning of the guide rollers for obtaining a large smoothing angle (substantially 180 degree) and the compensation of the cellulose fiber based web 23 is almost insignificant. FIG. 9D shows a position of the guide rollers, where the smoothing angle is relatively small (substantially 30 degree) and the compensation for the curvature of the cellulose fiber based web 23 almost reaches its maximum.

[0165] FIG. 10A-10C shows a perspective of the stacking machine having a vertical support column 88 connected to said frame 13 assembly. The handling arm 85 is pivotally connected to said vertical supporting column 88 and is further displaceable in a vertical direction in relation to said vertical supporting column. The handling arm 85, is shown connected to the vertical support column 88 via support column sliding bars. This arrangement enables the handling arm to slide in a vertical direction in relation to the vertical support column and at the same time being pivotally connected to the support column. The vertical slideable and pivotally connection, allows the handling arm to swing across the delivery table for contacting the sheets 28 individually which is illustrated in FIG. 10A and transferring the sheets 28 individually from said delivery table by swinging the handling arm 85 from above the delivery table as illustrated in FIG. 10B to above the receiving area illustrated in FIG. 10C for releasing the sheets 28 individually on a pallet 83 arranged at the receiving area. Further, as the handling arm 85 is arranged vertical slideable on the vertical supporting column 88, the transfer station is able to transfer the sheets 28 from the level of the delivery table, to a lower level, e.g. a surface level of a pallet, placed at a floor level as illustrated in FIG. 10C.

[0166] The holding members 86 (not shown in FIG. 10A-10C) for lifting the sheets 28, which holding members 86 may comprise vacuum lifters, are attached to a holding member support 87, which is pivotally connected to one end of the handling arm, and the other opposite end of the handling arm 85 is connected to the vertical support column 88.

REFERENCE NUMBERS

[0167] sheet dispensing system 10 [0168] guide roller 12 [0169] frame assembly 13 [0170] supporting frame 14 [0171] reel loading station 20 [0172] supporting frame column 21 [0173] underframe 211 [0174] castor wheels 213 [0175] supply reel 22 [0176] paper based material 23 [0177] supporting roller 25 [0178] finger of the supporting roller 251 [0179] reel sensor 26 [0180] support arm 27 [0181] sheet 28 [0182] first guide roller 31 [0183] second guide roller 32 [0184] guide plate 33 [0185] mounting plate 34 [0186] slots 35 [0187] lever 36 [0188] sheet dispenser station 40 [0189] sheet dispenser housing 41 [0190] housing covers 42 [0191] top wall 43, [0192] bottom wall 44 [0193] side wall 45 [0194] side wall cover 46 [0195] motor 47 [0196] feeding mechanism 50 [0197] tension roller 51 [0198] feeding roller 52 [0199] tensioning handle 53 [0200] linkage mechanism 54 [0201] cutting mechanism 60 [0202] cutter assembly 61 [0203] guide rod 62 [0204] sledge 63 [0205] guide bushing 64 [0206] pulling cable 65 [0207] delivery station 70 [0208] delivery table 71 [0209] supporting column 711 [0210] conveying means 72 [0211] sensor 74 [0212] transfer station 80 [0213] receiving area 81 [0214] receiving assembly 82 [0215] platform, pallet 83 [0216] gantry 84 [0217] handling arm 85 [0218] holding member 86 [0219] holding member support 87 [0220] vertical support column 88 [0221] support column sliding bars 89 [0222] supporting column 811 [0223] scissor mechanism 821 [0224] controller 90 [0225] cable 92 [0226] computer 94 [0227] smoothing mechanism 100, 200, 300, 400, 500, 600 [0228] primary guide roller 210a, 210b, [0229] secondary guide roller 212 [0230] main frame 214 [0231] pivot axis 216 [0232] first frame plate 218a [0233] second frame plates 218b [0234] reel loading station 302 [0235] underframe 310 [0236] linkage rods 311 [0237] first linkage rod 311a [0238] second linkage rod 311b [0239] first guide roller 312 [0240] second guide roller 314 [0241] castor wheel 315 [0242] linkage lever 316 [0243] locking element 317 [0244] bushing 318 [0245] supporting rollers 410 [0246] first guide rollers 412 [0247] second guide roller 414 [0248] recess 416 [0249] first roller 502 [0250] second roller 504 [0251] delivery table 506 [0252] guide roller 508 [0253] smoothing angle 510 [0254] delivery table 601 [0255] roller 602 603 [0256] first feeding roller 604 [0257] second feeding roller 605 [0258] common axis 606 [0259] smoothing angle 608 [0260] first guide roller 610 [0261] second guide roller 612

Points Describing Features of the Invention

[0262] 1. A sheet dispensing system for dispensing individual sheets, said sheet dispensing system comprising a frame assembly, a reel loading station, a sheet dispenser station, and a delivery station, [0263] said reel loading station, said sheet dispenser station, and said delivery station being supported individually or collectively by said frame assembly, [0264] said reel loading station including a supply reel of a cellulose fiber based web and a support for supporting said supply reel and allowing the dispensing of said cellulose fiber based web from said supply reel, [0265] said sheet dispenser station including a feeding mechanism and a cutting mechanism, [0266] said feeding mechanism serving to receive said cellulose fiber based web from said reel loading station and having a tension roller and a feeding roller, [0267] said cutting mechanism having a reciprocating cutter assembly for cutting said cellulose fiber based web into individual sheets when moved transversally relative to said cellulose fiber based web from a first position to a second position at opposite sides of said cellulose fiber based web and being prevented from cutting when moved in the opposite direction from said second position to said first position, [0268] said delivery station including a delivery table connected to said sheet dispenser station for receiving said individual dispensed sheets, and [0269] said reel loading station or said sheet dispenser station or delivery station further comprising a smoothing mechanism having a first guide roller and second guide roller, said first and second guide rollers being adjustable in relation to one another for altering the smoothing angle dependent of the diameter of said supply reel in order to compensate for the curvature of said cellulose fiber based web and provide non-curved individual sheets.

[0270] 2. The sheet dispensing system according to point 1, said cutting mechanism being prevented from cutting when moved in the opposite direction from said second position to said first position.

[0271] 3. The sheet dispensing system according to point 1, said cutting mechanism cutting when moved in the opposite direction from said second position to said first position.

[0272] 4. The sheet dispensing system according to point 2 or 3, said first and second guide rollers being adjustable in relation to one another for altering the smoothing angle by a mechanical suspension of the first guide roller and/or second guide.

[0273] 5. The sheet dispensing system according to point 2 or 3, said first and second guide rollers being adjustable in relation to one another for altering the smoothing angle by a mechanical coupling between the first guide roller and second guide roller.

[0274] 6. The sheet dispensing system according to point 2 or 3, said first and second guide rollers being adjustable in relation to one another for altering the smoothing angle by the provision of an electronic controller controlling said first and second rollers in relation to one another in response to an electrical signal generated by a sensor mounted on the loading station or the delivery station.

[0275] 7. The sheet dispensing system according to point 6, said controller having an input channel and an out signal, said controller being capable of receiving a signal from a reel sensor connected to said reel loading station for generating said electrical signal being representative of the diameter of said supply reel.

[0276] 8. The sheet dispensing system according to any of the proceeding points, said cellulose fiber based web being movable continuously, and said cutting mechanism being movable reciprocating parallel with and in synchronism with said cellulose fiber based web during the cutting of said cellulose fiber based web into said individual sheets.

[0277] 9. The sheet dispensing system according to any of the proceeding points, said cellulose fiber based web being movable intermittently and said cutting mechanism being movable transversally relative to said cellulose fiber based web during the cutting of said cellulose fiber based web into said individual sheets.

[0278] 10. The sheet dispensing system according to any of the proceeding points, said cutter assembly of the cutting mechanism being constituted by a blade, a mechanical roller knife or a laser cutter.

[0279] 11. The sheet dispensing system according to any of the proceeding points, said smoothing mechanism comprises a first second guide roller being mounted on a guide plate, which is pivotally connected to a mounting plate connected with the side wall of the sheet dispenser station housing.

[0280] 12. The sheet dispensing system according to point 11, said mounting plate having an arc portion with slots extending the width of said mounting plate, said slots are arranged near the circumference of the arc shape of said mounting plate, a lever with biasing means is arranged perpendicular on said guide plate, said lever is provided with a pin being substantially longer than the width of said guide plate, this will allow said lever to provide an interlocking of said guide plate relative to the mounting plate.

[0281] 13 A method of dispensing individual sheet by means of a sheet dispensing system comprising a frame assembly, a reel loading station, a sheet dispenser station, and a delivery station, said method comprising the following steps: [0282] providing said frame assembly for individually or collectively supporting said reel loading station, said sheet dispenser station and said delivery station, [0283] providing said reel loading station including a supply reel of a cellulose fiber based web and a support for supporting said supply reel, [0284] providing said sheet dispenser station including a feeding mechanism and a cutting mechanism, [0285] providing said feeding mechanism having a tension roller and a feeding roller, [0286] providing said cutting mechanism having a reciprocating cutter assembly, [0287] providing said delivery station connected to said sheet dispenser station, [0288] providing a smoothing mechanism having a first guide roller and second guide roller at said reel loading station or said sheet dispenser station or said delivery station, [0289] dispensing said cellulose fiber based web to said feeding mechanism serving to receive said cellulose fiber based web from said reel loading station [0290] cutting said cellulose fiber based web by moving said reciprocating cutter transversally relative to said cellulose fiber based web from a first position to a second position at opposite sides of said cellulose fiber based web and preventing cutting when moving said reciprocating cutter in the opposite direction from said second position to said first position, [0291] adjusting said first or second guide rollers being adjustable in relation to one another, said guide rollers being adjustable for altering the smoothing angle dependent of the diameter of the supply reel in order to compensate for the curvature of said cellulose fiber based web and provide non-curved individual sheets. [0292] dispensing said individual sheets on said delivery table of said delivery station

[0293] 14. A method according to point 13 further including any of the features of the system according to any of the points 2-12.