Elastic roll, roll unit, double facer, single facer, gluing device, guiding device, and conveying device

Abstract

Provided are an elastic roll, a roll unit, a double facer, a single facer, a gluing device, a guiding device, and a conveyance device, wherein a body part and a plurality of pressing members are included, the body part having a circular outer peripheral surface, the plurality of pressing members being elastically deformable in a circular arc shape and provided at intervals in the circumferential direction on the outer peripheral part of the body part. Each pressing member has a proximal end portion, in the longitudinal direction, fixed to the outer peripheral portion of the body part, and has a shape curved toward a distal end portion thereof, the distal end portion being slidable on the outer peripheral surface of the pressing member adjacent in the circumferential direction.

Description

Elastic rolls and roll units, double facers, single facers, gluing devices, guide devices, conveying devices

[0001] The present disclosure relates to an elastic roll and a roll unit, a double facer, a single facer, a gluing device, a guide device, and a conveying device.

[0002] When conveying a thin sheet, a conveying force is applied to the sheet by rotating a roll while pressing the roll against the front or back surface of the sheet with a predetermined pressure. An example of such a conveying roll is described in Patent Document 1. The conveying roll described in Patent Document 1 has a polygonal fixed roller with multiple elastic pieces fixed to the outer periphery at intervals in the circumferential direction.

[0003] Special Publication No. 2011-504862

[0004] In a conventional conveying roll, multiple elastic pieces sequentially contact the sheet when the fixed roller rotates, thereby applying a conveying force to the sheet. In this case, the tip of each elastic piece of the conveying roll intermittently contacts the sheet. As a result, the sheet is intermittently applied with a conveying force from each elastic piece of the conveying roll, making it difficult for the conveying roll to stably convey the sheet.

[0005] The present disclosure is intended to solve the above-mentioned problems, and aims to provide an elastic roll and roll unit, a double facer, a single facer, a gluing device, a guide device, and a conveying device that enable stable pressing and conveying of sheets.

[0006] In order to achieve the above object, the elastic roll of the present disclosure comprises a main body portion having a circular outer peripheral surface, and a plurality of pressing members each having an arc shape and capable of elastic deformation, and each pressing member is provided at intervals in the circumferential direction on the outer periphery of the main body portion, and each pressing member has a base end in the longitudinal direction fixed to the outer periphery of the main body portion and a shape that curves toward a tip end, and the tip end can slide against the outer periphery of the pressing member that is circumferentially adjacent to the main body portion.

[0007] In the roll unit of the present disclosure, the elastic rolls are arranged in a staggered pattern.

[0008] In addition, the double facer disclosed herein comprises a heating plate arranged along the sheet conveying direction, and pressure rolls arranged above the heating plate at intervals in the sheet conveying direction and clamping multiple sheets between the heating plate and the heating plate, and the elastic roll is used as the pressure roll.

[0009] In addition, the single facer disclosed herein comprises an upper roll and a lower roll that corrugate the sheet by meshing with each other's corrugated outer peripheries, and a pressure roll that is arranged on the lower roll on the outer periphery of the upper roll and clamps the flat sheet and the corrugated sheet, and the elastic roll is used as the pressure roll.

[0010] In addition, the gluing device of the present disclosure includes a glue dam, a gluing roll that scoops up the glue stored in the glue dam, and a rider roll that is arranged on the outer periphery of the gluing roll and clamps a sheet between the gluing roll and the rider roll, and the elastic roll is used as the rider roll.

[0011] The guide device of the present disclosure includes a guide roll that guides a sheet by wrapping it around a portion of the outer circumferential surface in the circumferential direction, and the elastic roll described in claim 1 is used as the guide roll.

[0012] In addition, the conveying device of the present disclosure includes a first roll that contacts the front surface of the sheet and a second roll that contacts the back surface of the sheet, and the elastic roll described in claim 1 is used as the first roll or the second roll.

[0013] According to the elastic roll and roll unit, double facer, single facer, gluing device, guide device, and conveying device of the present disclosure, it is possible to stably press and convey a sheet.

[0014] FIG. 1 is a schematic diagram of a corrugating machine according to this embodiment. FIG. 2 is a schematic diagram of a double facer according to a first embodiment. FIG. 3 is a front view of an elastic roll according to the first embodiment. FIG. 4 is a front view of a pressing member in the elastic roll. FIG. 5 is a detailed view of the outer periphery of the elastic roll. FIG. 6 is a cross-sectional view of a first modified elastic roll. FIG. 7 is a front view of a plurality of divided rolls. FIG. 8 is a front view of a second modified elastic roll. FIG. 9 is a plan view of a modified roll unit according to the first embodiment. FIG. 10-1 is a schematic diagram of a single facer according to a second embodiment. FIG. 10-2 is a schematic diagram of a modified single facer according to the second embodiment. FIG. 11 is a schematic diagram of a gluing device according to a third embodiment. FIG. 12 is a side view of a guide device according to a fourth embodiment. FIG. 13 is a plan view of a guide device. FIG. 14 is a schematic diagram of a conveying device according to a fifth embodiment.

[0015] Preferred embodiments of the present disclosure will be described in detail below with reference to the drawings. Note that the present disclosure is not limited to these embodiments, and when there are multiple embodiments, the present disclosure also includes configurations that combine the embodiments. Furthermore, the components in the embodiments include those that can be easily imagined by a person skilled in the art, those that are substantially identical, and those that are within the so-called equivalent range.

[0016] [First embodiment] <Corrugating machine> A corrugated cardboard sheet manufacturing device of this embodiment is applied to a corrugating machine. Fig. 1 is a schematic diagram showing a corrugating machine. In the following description, the longitudinal direction of the corrugating machine is defined as the X direction, the horizontal direction perpendicular to the longitudinal direction (X direction) of the corrugating machine is defined as the Y direction (width direction of the corrugated cardboard sheet), and the vertical direction perpendicular to the longitudinal direction (X direction) of the corrugating machine (thickness direction of the corrugated cardboard sheet) is defined as the Z direction. The corrugated cardboard base paper corresponds to either the front liner, the core, or the back liner.

[0017] As shown in Figure 1, the corrugating machine 10 first laminates a back liner C1 onto a corrugated corrugation medium B1 to produce a single-faced cardboard sheet D1, and then laminates a back liner C2 onto a corrugated corrugation medium B2 to produce a single-faced cardboard sheet D2. Next, the back liner C2 of the single-faced cardboard sheet D2 is laminated onto the medium B1 of the produced single-faced cardboard sheet D1, and the front liner A is laminated onto the medium B2 of the single-faced cardboard sheet D2 to produce a continuous double-faced cardboard sheet. The continuous double-faced cardboard sheet is then cut to a predetermined length to produce a plate-shaped double-faced cardboard sheet.

[0018] The corrugating machine 10 can also produce double-faced corrugated cardboard sheets by laminating a single-faced corrugated cardboard sheet D2 or a single-faced corrugated cardboard sheet D1 with a front liner A. Therefore, in the following description, double-faced corrugated cardboard sheets and double-faced corrugated cardboard sheets will be collectively referred to as double-faced corrugated cardboard sheets E. Furthermore, plate-shaped double-faced corrugated cardboard sheets and plate-shaped double-faced corrugated cardboard sheets will be collectively referred to as double-faced corrugated cardboard sheets F.

[0019] The corrugating machine 10 includes a mill roll stand 11 for the core B1, a mill roll stand 12 for the back liner C1, a single facer 13, a bridge 14, a mill roll stand 15 for the core B2, a mill roll stand 16 for the back liner C2, a single facer 17, a bridge 18, a mill roll stand 19 for the front liner A, a preheater 20, a glue machine 21, a double facer 22, a rotary shear 23, a slitter scorer 24, a cutoff 25, a defective product ejection device 26, and a stacker 27.

[0020] Roll paper with cores B1 and B2 wound in roll form is mounted on each side of the mill roll stands 11 and 15 in the X direction, and splicers 31 and 32 are provided between each roll paper to splice the paper. While one roll paper is being fed, the other roll paper is loaded and preparation for splicing begins. When one roll paper is running low, the splicers 31 and 32 splice the other roll paper onto the first roll paper. Therefore, cores B1 and B2 are continuously fed downstream from each mill roll stand 11 and 15.

[0021] The mill roll stands 12, 16 are fitted with rolls of paper on both sides in the X direction, each with a back liner C1, C2 wound in a roll shape, and splicers 33, 34 are provided between each roll of paper to splice them. While one roll of paper is being fed, the other roll of paper is loaded and preparation for splicing is made. When one roll of paper is running low, the splicers 33, 34 splice the other roll of paper onto the first roll of paper. Therefore, the back liners C1, C2 are continuously fed downstream from each mill roll stand 12, 16.

[0022] The cores B1, B2 delivered from the mill roll stands 11, 15 and the back liners C1, C2 delivered from the mill roll stands 12, 16 are preheated by preheaters (not shown). Each preheater has a heating roll to which steam is supplied, and the cores B1, B2 and back liners C1, C2 are heated to a predetermined temperature by being wound around the heating roll and transported.

[0023] The single facer 13 processes the heated corrugation medium B1 into a corrugated shape, glues the tops of each flute, and then attaches a heated back liner C1 to form a single-faced cardboard sheet D1. A pick-up conveyor 28 is provided at the outlet of the single-faced cardboard sheet D1, and the single-faced cardboard sheet D1 formed by the single facer 13 is transported to the bridge 14. The bridge 14 temporarily retains the single-faced cardboard sheet D1 to absorb the speed difference between the single facer 13 and the double facer 22.

[0024] The single facer 17 forms the heated corrugation medium B2 into a corrugated shape, glues the tops of each flute, and then attaches a heated back liner C2 to form a single-faced cardboard sheet D2. A pick-up conveyor 29 is provided at the outlet of the single-faced cardboard sheet D2, and the single-faced cardboard sheet D2 formed by the single facer 17 is transported to the bridge 18. The bridge 18 temporarily retains the single-faced cardboard sheet D2 to absorb the speed difference between the single facer 17 and the double facer 22.

[0025] In addition, the paper guide device 30 is provided at the exit portion of the bridge 14 and the bridge 18. The paper guide device 30 adjusts the Y-direction position of the single-faced cardboard sheets D1 and D2 between the bridge 14 and the bridge 18 and the double facer 22.

[0026] Rolls of paper with front liner A wound in roll form are mounted on both sides of the mill roll stand 19 in the X direction, and a splicer 35 for splicing the paper is provided between each roll. While one roll of paper is being fed, the other roll of paper is loaded and preparation for splicing is made, and when one roll of paper is running low, the splicer splices the other roll of paper onto the first roll. For this reason, the front liner A is continuously fed downstream from the mill roll stand 19.

[0027] The preheater 20 has three preheating rolls 41, 42, and 43 arranged in the Z direction. The preheating roll 41 heats the front liner A, the preheating roll 42 heats the single-faced cardboard sheet D2, and the preheating roll 43 heats the single-faced cardboard sheet D1. Each of the preheating rolls 41, 42, and 43 has a winding amount adjustment device (not shown) and is heated to a predetermined temperature by supplying steam thereto. The front liner A, the single-faced cardboard sheet D2, and the single-faced cardboard sheet D1 are wrapped around the peripheral surface, thereby preheating the rolls.

[0028] The glue machine 21 has gluing devices 44 and 45 arranged side by side in the Z direction. The gluing device 44 contacts and glues each top of the corrugations of the corrugation medium B2 in the single-faced cardboard sheet D2 heated by the preheating roll 42. The gluing device 45 contacts and glues each top of the corrugations of the corrugation medium B1 in the single-faced cardboard sheet D1 heated by the preheating roll 43. The single-faced cardboard sheets D1 and D2 glued by the glue machine 21 are transferred to the double facer 22 in the next process. The front liner A heated by the preheating roll 41 is also transferred to the double facer 22 through the glue machine 21.

[0029] The double facer 22 has an upstream heating section 36 and a downstream cooling section 37 along the conveying line of the single-faced cardboard sheets D1, D2 and the front liner A. The single-faced cardboard sheets D1, D2 and the front liner A, which have been glued by the glue machine 21, are transported between the pressure belt and the hot plate in the heating section 36, and are transported together in an overlapping state toward the cooling section 37. During this transport, the single-faced cardboard sheets D1, D2 and the front liner A are heated and pressurized, so that they are bonded together to form a continuous double-faced cardboard sheet E, which is then naturally cooled while being transported.

[0030] The double-sided corrugated cardboard sheet E produced by the double facer 22 is transferred to the slitter scorer 24. The slitter scorer 24 cuts the wide double-sided corrugated cardboard sheet E along the X direction to a predetermined width and processes creases extending in the X direction. The slitter scorer 24 is composed of a first slitter scorer unit 46 and a second slitter scorer unit 47, which have substantially the same structure and are arranged along the X direction of the double-sided corrugated cardboard sheet E. The wide double-sided corrugated cardboard sheet E is cut by the slitter scorer 24 to form a double-sided corrugated cardboard sheet E of a predetermined width.

[0031] The cutoff machine 25 cuts the double-sided cardboard sheet E cut in the X direction by the slitter scorer 24 along the Y direction to form plate-shaped double-sided cardboard sheets F of a predetermined length. The defective product ejection device 26 ejects double-sided cardboard sheets F determined to be defective by a defect detection device (described later) from the conveying line. The defective product ejection device 26 has a discharge conveyor and a sorting roll (not shown). When a plate-shaped double-sided cardboard sheet F determined to be defective is conveyed, the sorting roll descends to sort the defective plate-shaped double-sided cardboard sheet F onto the discharge conveyor and eject it. The stacker 27 stacks double-sided cardboard sheets F determined to be non-defective and ejects them from the machine as products.

[0032] <Double Facer> FIG. 2 is a schematic diagram showing the double facer of the first embodiment.

[0033] 2, the heating section 36 is disposed on the upstream side in the conveying direction of the double facer 22. The heating section 36 has a plurality of heating plates 51, a plurality of pressure rolls 52, and a pressure belt 53.

[0034] A first support frame 54 is installed upstream in the conveying direction, and a second support frame 55 is installed downstream. The first support frame 54 and the second support frame 55 are integrally formed. A plurality of heating plates 51 are arranged in series along the conveying direction above the second support frame 55. A plurality of pressure rolls 52 are arranged above the plurality of heating plates 51. The plurality of pressure rolls 52 are arranged at intervals in the conveying direction, with their rotation axes aligned horizontally perpendicular to the conveying direction. The plurality of pressure rolls 52 are rotatably supported by a plurality of support members 56 arranged above. A swing cylinder 57 is arranged above the first support frame 54. The swing cylinder 57 has a drive rod connected to the support member 56 via a link mechanism 58. Therefore, by driving the swing cylinder 57, the support member 56 can be raised and lowered via the link mechanism 58, thereby adjusting the vertical positions of the plurality of pressure rolls 52. In other words, the gap between the heating plate 51 and the pressure roll 52 can be adjusted.

[0035] The pressure belt 53 is an endless belt that is wound around a support roll 59 disposed on the upstream side of the heating section 36 and a support roll (not shown) disposed on the downstream side. The pressure belt 53 is also disposed between the multiple heating plates 51 and the multiple pressure rolls. The pressure belt 53 moves, for example, when the downstream support roll (not shown) is driven to rotate.

[0036] Glued single-faced cardboard sheet D1 is supplied between heating plate 51 and pressure belt 53. Glued single-faced cardboard sheet D2 is guided by guide roll 61 and supplied between heating plate 51 and pressure belt 53. Front liner A is guided by guide roll 62, preheated by preheating roll 63, guided by guide roll 64, and then supplied between heating plate 51 and pressure belt 53. As single-faced cardboard sheets D1, D2 and front liner A are transported between heating plate 51 and pressure belt 53, they are heated by heating plate 51 and receive pressure from multiple pressure rolls 52 via pressure belt 53, causing them to be stuck together to form a continuous double-faced cardboard sheet E.

[0037] <Elastic Roller> FIG. 3 is a front view showing the elastic roll of the first embodiment, FIG. 4 is a front view showing a pressing member in the elastic roll, and FIG. 5 is a detailed view showing the outer periphery of the elastic roll.

[0038] 2 and 3, in the double facer 22, the multiple pressure rolls 52 are elastic rolls 70. The elastic roll 70 has a main body 71 and multiple pressing members 72.

[0039] As shown in FIGS. 3 to 5 , the main body 71 has a cylindrical shape with a center O1 and a circular through-hole 81 formed in the center. The main body 71 is formed of, for example, metal (such as stainless steel) or resin (such as fiber-reinforced plastic). A support shaft (not shown) is inserted into the through-hole 81, and the main body 71 is rotatably supported by the support shaft. The main body 71 also has a circular outer circumferential surface and multiple slits 82 formed in the outer circumferential surface. The multiple slits 82 are formed at intervals (preferably equal intervals) in the circumferential direction. The slits 82 are formed in a substantially linear shape, forming an acute angle on one side of the circumferential surface of the main body 71 (an obtuse angle on the other side of the circumferential direction). The slits 82 are formed along the axial direction of the main body 71 and penetrate both ends, but both ends do not have to be penetrated. The main body 71 is not limited to a cylindrical shape and may have, for example, a polygonal tubular shape. Furthermore, the through-hole 81 is not limited to a circular shape, but may be, for example, a polygonal shape.

[0040] The pressing member 72 is a thin plate having a width approximately equal to the axial length of the main body 71 and forming an arc shape along the longitudinal direction. The pressing member 72 is preferably an elastic member having a constant thickness in the width and longitudinal directions. The pressing member 72 is formed from, for example, metal (stainless steel, etc.) or resin (fiber-reinforced plastic, etc.). The multiple pressing members 72 are provided at intervals (preferably at equal intervals) in the circumferential direction on the outer periphery of the main body 71.

[0041] The pressing member 72 has a base end 72a in the longitudinal direction fixed to the outer periphery of the main body 71. That is, the pressing member 72 is fixed by fitting the base end 72a into a slit 82 formed in the outer periphery of the main body 71. At this time, the base end 72a of the pressing member 72 is fixed to the outer periphery of the main body 71, for example, with an adhesive. The pressing member 72 may be fixed to the main body 71 by, for example, welding, shrink fitting, cold fitting, or press fitting. Furthermore, one surface (inner surface) of the base end 72a forms an acute angle with respect to the outer periphery of the main body 71, and the other surface (outer surface) forms an obtuse angle with respect to the outer periphery of the main body 71. In this case, the portion of the pressing member 72 that fits into the slit 82 may be bent in the thickness direction relative to the portion of the base end 72a that protrudes from the slit 82 toward the outer periphery of the main body 71. The pressing member 72 has a shape that curves toward the tip end. That is, the pressing member 72 has a shape in which the tip end 72b side curves toward the outer peripheral surface of the main body 71, and the tip end 72b can slide against the outer peripheral surface of the circumferentially adjacent pressing member 72 without being joined to it. In this case, it is preferable that the tip end 72b of the pressing member 72 contacts the outer peripheral surface of the circumferentially adjacent pressing member 72. However, the tip end 72b of the pressing member 72 may be positioned with a gap between it and the outer peripheral surface of the circumferentially adjacent pressing member 72.

[0042] 4(a), the pressing member 72 has a fixing portion 83, a first portion 84, a second portion 85, and a third portion 86. The fixing portion 83 includes the base end 72a, is substantially linear in the longitudinal direction, and is fitted into and fixed in the slit 82 of the main body portion 71. The first portion 84 extends from the fixing portion 83 toward the tip end 72b in a curved shape. The second portion 85 extends from the first portion 84 toward the tip end 72b in a curved shape. The third portion 86 includes the tip end 72b and extends from the second portion 85 toward the tip end 72b in a curved shape.

[0043] The second portion 85 smoothly connects the first portion 84 and the third portion 86 without any steps, and has a curvature greater than the curvatures of the first portion 84 and the third portion 86. The pressing member 72 has a tapered surface 87 on the tip end 72b side of the third portion 86. The tapered surface 87 is formed on the inside of the third portion 86, that is, at a position facing the outer circumferential surface of the circumferentially adjacent pressing member 72. The tapered surface 87 on the inner surface on the tip end 72b side of the pressing member 72 forms a tapered shape. The tapered surface 87 may be flat or may have a curved shape that follows the outer circumferential surface of the opposing pressing member 72. It is preferable that the tapered surface 87 of the pressing member 72 contact the outer circumferential surface of the circumferentially adjacent pressing member 72, but as shown in FIG. 5 , the tapered surface 87 may be positioned with a gap therebetween. In this case, the pressing member 72 elastically deforms inward, causing the tapered surface 87 to come into contact with the outer peripheral surface of the pressing member 72 adjacent in the circumferential direction, eliminating any gaps and allowing the elastic roll 70 to slide smoothly in the circumferential direction without any steps.

[0044] Although the pressing member 72 has a tapered surface 87 on the inner surface on the tip end portion 72b side, the tapered surface 87 may not be present. That is, the pressing member 72 may have a constant thickness toward the tip end portion 72b, as shown in FIG. 4B . Even if the pressing member 72 does not have a tapered surface 87, the inner surface of the tip end portion 72b may be in contact with the outer peripheral surface of an adjacent pressing member 72, or may be positioned with a gap therebetween. Even in this case, the pressing member 72 elastically deforms inward, causing the tip end portion 72b to come into contact with the outer peripheral surface of the circumferentially adjacent pressing member 72.

[0045] Furthermore, in the above embodiment, the first portion 84 of the pressing member 72 extends in a curved shape from the fixed portion 83 toward the tip 72b, but the shape is not limited to this. That is, as shown in FIG. 4( c), the first portion 84 may extend in a substantially linear shape from the fixed portion 83 toward the tip 72b. The second portion 85 extends in a curved shape from the first portion 84 toward the tip 72b. The third portion 86 includes the tip 72b and extends in a curved shape from the second portion 85 toward the tip 72b.

[0046] Before the pressing member 72 is fixed to the main body 71, for example, the second portion 85 is curved more significantly, and the curvature is set to be larger than the curvature after the pressing member 72 is fixed to the main body 71. Therefore, when the pressing member 72 is fixed to the main body 71, it is preferable that the tapered surface 87 on the tip end 72b side of the third portion 86 contacts and presses against the outer circumferential surface of the circumferentially adjacent pressing member 72. Note that the portion of the pressing member 72 that is curved more significantly is not limited to the second portion 85. For example, the first portion 84 or the third portion 86 may be curved more significantly. Furthermore, the first portion 84, the second portion 85, and the third portion 86 may each contact and press against the outer circumferential surface of the circumferentially adjacent pressing member 72 with their respective curvatures.

[0047] As shown in Figures 2 and 3, the elastic roll 70 is used as multiple pressure rolls 52 in the double facer 22. In this case, in the double facer 22 shown in Figure 2, the elastic roll 70 is arranged with multiple pressing members 72 wound counterclockwise (as shown in Figure 3). However, the multiple pressing members 72 may also be arranged with the multiple pressing members 72 wound clockwise. When the pressure belt 53 moves, the multiple elastic rolls 70 rotate in the moving direction of the pressure belt 53. The multiple elastic rolls 70 may be rotatable by a driving device.

[0048] When the single-faced cardboard sheets D1, D2 and the front liner A are stacked and fed between the heating plate 51 and the pressure belt 53 (the plurality of pressure rolls 52), the rotating plurality of elastic rolls 70 apply a pressing force to the single-faced cardboard sheets D1, D2 and the front liner A via the pressure belt 53. When the plurality of elastic rolls 70 press the single-faced cardboard sheets D1, D2 and the front liner A via the pressure belt 53, each pressing member 72 elastically deforms inward, generating an appropriate pressing force. At this time, each pressing member 72 elastically deforms so as to bend toward the main body portion 71 with the fixed portion 83 side as a fulcrum, and the tip portion 72b moves while contacting the outer peripheral surface of the third portion 86 of the adjacent pressing member 72.

[0049] That is, when the pressing members 72 press the single-faced cardboard sheets D1, D2 and the front liner A via the pressure belt 53, the tip portions 72b slide on the outer peripheral surfaces of the adjacent pressing members 72 while pressing the pressure belt 53. Therefore, the third portions 86 of the pressing members 72 of the elastic roll 70 are always in contact with and press the pressure belt 53. As a result, when the elastic roll 70 rotates, the fluctuations in the pressing force with which the elastic roll 70 presses the single-faced cardboard sheets D1, D2 and the front liner A are reduced, and the single-faced cardboard sheets D1, D2 and the front liner A can be pressed with an appropriate pressing force.

[0050] Furthermore, since the pressing members 72 are elastic members and can deform differently in the width direction, even if the heating plate 51 thermally deforms to different heights in the width direction, each pressing member 72 elastically deforms in response to the thermal deformation of the heating plate 51. Therefore, the elastic roll 70 can apply an appropriate pressing force in the width direction to the single-faced cardboard sheets D1, D2 and the front liner A, thereby appropriately bonding the single-faced cardboard sheets D1, D2 and the front liner A to each other. Furthermore, since the elastic roll 70 rotates in conjunction with the movement of the pressure belt 53, sliding resistance can be reduced. Furthermore, because the pressing members 72 of the elastic roll 70 elastically deform, high-precision adjustment of the gap between the pressure belt 53 and the heating plate 51 and the parallelism in the width direction is not required. As a result, the extension / retraction amount of the drive rod of the swing cylinder 57 may be changed from a stepless adjustment to two levels of extension / retraction, for example, to control only the strength of the pressure.

[0051] Although the double facer 22 is described as having multiple heating plates 51, multiple pressure rolls 52, and a pressure belt 53, it may be configured with only the heating plates 51 and the pressure rolls 52, eliminating the pressure belt 53. In such a configuration, the elastic roll 70 used as the pressure roll 52 directly presses the single-faced cardboard sheets D1, D2 and the front liner A. Since the elastic roll 70 contacts the single-faced cardboard sheets D1, D2 and the front liner A, it can rotate appropriately along with them. However, some or all of the multiple elastic rolls 70 may be driven. In this case, it is preferable to arrange the elastic roll 70 with the multiple pressure members 72 wound clockwise, opposite to the orientation shown in FIG. 3 .

[0052] <First Modified Example of Elastic Roller> FIG. 6 is a cross-sectional view showing a first modified example of the elastic roll, and FIG. 7 is a front view of a plurality of divided rolls.

[0053] 6 and 7 , the elastic roll 70A has multiple (three in this embodiment) divided elastic rolls 70a, 70b, and 70c. The divided elastic rolls 70a, 70b, and 70c have the same configuration and are substantially the same as the elastic roll 70 described above. That is, the divided elastic rolls 70a, 70b, and 70c have multiple divided main body portions (main body portions 71) and multiple divided pressing members (pressing members 72). Note that the number of divisions of the elastic roll 70A is not limited to three.

[0054] The elastic roll 70A has a plurality of divided elastic rolls 70a, 70b, and 70c arranged in series in the axial direction, and a common support shaft 91 is inserted into the through-holes 81 of each divided main body portion (main body portion 71). Each end of the support shaft 91 is rotatably supported by the lower part of a pair of support arms 92 via bearings 93. The pair of support arms 92 have their upper parts connected to the support member 56.

[0055] 2 and 6, the elastic roll 70A is assembled so that the rotational phases of the multiple divided elastic rolls 70a, 70b, and 70c are different. That is, the phases of the fixed positions of the divided pressing members (pressing members 72) to the divided main bodies (main bodies 71) of the multiple divided elastic rolls 70a, 70b, and 70c are different. That is, the divided elastic roll 70b is shifted by an angle θ1 relative to the divided elastic roll 70a, and the divided elastic roll 70c is shifted by an angle θ2.

[0056] When the rotating elastic roll 70A presses the single-faced cardboard sheets D1, D2 and the front liner A via the pressure belt 53, the rotation phases of the multiple divided elastic rolls 70a, 70b, 70c differ, so the positions of the pressing members 72 that come into contact with the pressure belt 53 differ. Therefore, the elastic roll 70A can apply a more uniform pressing force overall to the single-faced cardboard sheets D1, D2 and the front liner A.

[0057] <Second Modification of Elastic Roller> FIG. 8 is a front view showing a second modification of the elastic roll.

[0058] As shown in Fig. 8, the elastic roll 70B has a main body 71, multiple pressing members 72, and elastic members 73. The main body 71 and the pressing members 72 are similar to those of the elastic roll 70. That is, the elastic roll 70B has multiple pressing members 72 fixed to the outer periphery of the main body 71, and cylindrical elastic members 73 attached to the outside of the multiple pressing members 72. The elastic members 73 are made of metal, resin, rubber, or the like. It is preferable that the elastic members 73 are not coupled to the multiple pressing members 72, but are positioned so as to slightly press the multiple pressing members 72 inward.

[0059] 2 and 8, when the rotating elastic roll 70B presses the single-faced cardboard sheets D1, D2 and the front liner A via the pressure belt 53, the elastic force of the multiple pressing members 72 is transmitted to the pressure belt 53 via the elastic members 73. Therefore, the elastic roll 70B can apply a uniform pressing force to the single-faced cardboard sheets D1, D2 and the front liner A as a whole.

[0060] 2, 6, and 8, the roll unit has a plurality of pressure rolls 52 (elastic rolls 70, 70A, 70B). Preferably, the roll unit is composed of the plurality of pressure rolls 52 (elastic rolls 70, 70A, 70B), a support member 56, a support shaft 91, a support arm 92, and a bearing 93.

[0061] <Modification of Roll Unit> FIG. 9 is a plan view showing a modification of the roll unit of the first embodiment.

[0062] As shown in Fig. 9, the roll unit 100 has a plurality of elastic rolls 70. The plurality of elastic rolls 70 are arranged in a staggered pattern. That is, a plurality of support shafts 91 are rotatably supported at intervals in the conveyance direction. The plurality of elastic rolls 70 are mounted on each support shaft 91 at intervals in the axial direction. The plurality of elastic rolls 70 mounted on each support shaft 91 are arranged in a staggered pattern so as not to come into contact with one another.

[0063] The roll unit 100 may use an elastic roll 70A (see FIG. 6) or an elastic roll 70B (see FIG. 8) instead of the elastic roll 70.

[0064] [Second embodiment] Fig. 10-1 is a schematic diagram showing a single facer according to a second embodiment. Note that members having the same functions as those in the first embodiment described above are given the same reference numerals and detailed descriptions thereof will be omitted.

[0065] As shown in Figure 1, the corrugating machine 10 is equipped with single facers 13 and 17. The single facers 13 and 17 have almost the same configuration, so only the single facer 13 will be described. As shown in Figure 10-1, the single facer 13 processes a heated corrugation medium B1 into a corrugated shape, glues the tops of each corrugation, and then bonds a heated back liner C1 to form a single-faced cardboard sheet D1.

[0066] The single facer 13 has an upper fluted roll 111 , a lower fluted roll 112 , and a pressure roll 113 .

[0067] The upper corrugated roll 111 can be driven to rotate by a drive device (not shown), and has a corrugated outer circumferential surface. The lower corrugated roll 112, like the upper corrugated roll 111, has a corrugated outer circumferential surface and is disposed below the upper corrugated roll 111, engaging with the outer circumferential surface of the upper corrugated roll 111 via a single-faced corrugated cardboard sheet D1. The pressure rolls 113 are disposed above the upper corrugated roll 111, and multiple pressure rolls 113 (five in this embodiment) are provided at intervals in the circumferential direction. However, the number of pressure rolls 113 is not limited to five. The multiple pressure rolls 113 have flat outer circumferential surfaces, and rotate together with the upper corrugated roll 111 by contacting the corrugated outer circumferential surface of the upper corrugated roll 111 via a single-faced corrugated cardboard sheet D1 using a pressing mechanism (not shown).

[0068] Furthermore, a backup roll 114 is disposed on the opposite side of the upper roll 111, i.e., above, each of the multiple pressure rolls 113. The multiple backup rolls 114 rotate together in contact with the multiple pressure rolls 113. The backup rolls 114 receive the reaction force of the pressure rolls 113. Note that the backup rolls 114 may be eliminated by increasing the outer diameter of the pressure rolls 113.

[0069] The backup roll 114 may also be in contact with the support shaft (not shown) of the pressure roll 113. In this case, the pressure roll 113 is made up of a plurality of divided pressure rolls, which are mounted at intervals in the axial direction of the support shaft. The backup roll 114 is also made up of a plurality of divided backup rolls, which are mounted at intervals in the axial direction of the support shaft. The plurality of divided backup rolls are then arranged between the plurality of divided pressure rolls and brought into contact with the support shaft of the pressure roll 113.

[0070] The single facer 13 includes a gluing device 121. The gluing device 121 is disposed near the upper roll 111. The gluing device 121 includes a glue dam 122, a gluing roll 123, a meter roll 124, and a glue scraper blade 125.

[0071] The glue dam 122 stores a predetermined amount of glue. The glue application roll 123 applies the glue stored in the glue dam 122 to the core B1 transported by the upper roll 111, thereby gluing the core B1. The meter roll 124 contacts the outer peripheral surface of the glue application roll 123 and rotates in sync with it, thereby adjusting the amount of glue applied to the outer peripheral surface of the glue application roll 123. The glue scraper blade 125 contacts the outer peripheral surface of the meter roll 124, thereby scraping off excess glue removed from the glue application roll 123 and adhering to the outer peripheral surface of the meter roll 124.

[0072] The single facer 13 is provided with preheaters 131 and 132. The preheater 131 has two preheating rolls 133 and 134. The back liner C1 is wrapped around the preheating rolls 133 and 134 to heat the back liner C1. The preheater 132 has one preheating roll 135. The core B1 is wrapped around the preheating roll 135 to heat the core B1.

[0073] In the single facer 13, the above-described elastic roll 70 is applied to the multiple pressure rolls 113. As shown in FIG. 3, the elastic roll 70 has a main body 71 and multiple pressing members 72. In this case, in the single facer 13 shown in FIG. 10-1, the elastic roll 70 is arranged in a state where the multiple pressing members 72 are wound counterclockwise (the state shown in FIG. 3). However, the multiple pressing members 72 may also be arranged in a state where they are wound clockwise. Furthermore, the multiple elastic rolls 70 may be applied to a roll unit 100 (see FIG. 9) in which the multiple elastic rolls 70 are arranged in a staggered pattern.

[0074] 3 and 10-1, the back liner C1 is heated by a preheater 131, then wound around a guide roll 136, and then transferred between the upper roll 111 and the pressure roll 113 (elastic roll 70). Meanwhile, the medium B1 is heated by a preheater 132, then wound around a guide roll 137, and then transferred between the upper roll 111 and the lower roll 112. The medium B1 is then processed into a corrugated shape at the meshing portion between the upper roll 111 and the lower roll 112, and then guided by the upper roll 111 to be transferred between the upper roll 111 and the pressure roll 113 (elastic roll 70).

[0075] At this time, the corrugated medium B1 is glued to the top of each corrugation by contacting the gluing roll 123 of the gluing device 121. The glued medium B1 and back liner C1 are then transferred between the upper corrugation roll 111 and the pressure roll 113 (elastic roll 70) and bonded together to form a single-faced cardboard sheet D1.

[0076] When the medium B1 and the back liner C1 are stacked and fed between the upper roll 111 and the pressure roll 113 (elastic roll 70), the rotating elastic rolls 70 apply a pressing force to the medium B1 and the back liner C1. When the elastic rolls 70 press the medium B1 and the back liner C1, each pressing member 72 elastically deforms inward, generating an appropriate pressing force. At this time, each pressing member 72 elastically deforms so as to bend toward the main body portion 71, with the fixed portion 83 serving as a fulcrum, and the tip portion 72b moves while contacting the outer peripheral surface of the third portion 86 of the adjacent pressing member 72.

[0077] That is, when the pressing members 72 press the medium B1 and the back liner C1, the tip portions 72b slide against the outer peripheral surfaces of the adjacent pressing members 72. Therefore, the third portions 86 of the elastic rolls 70 are constantly in contact with and pressing the medium B1 and the back liner C1. As a result, when the elastic rolls 70 rotate, the pressure with which the elastic rolls 70 press the medium B1 and the back liner C1 is less variable, allowing the medium B1 and the back liner C1 to be pressed with an appropriate pressure. Furthermore, by arranging multiple elastic rolls 70 with diameters smaller than the outer diameter of the upper corrugated roll 111, the pressure applied by a single pressing member 72 to the medium B1 and the back liner C1 can be reduced, thereby suppressing deformation of the single-faced cardboard sheet D1. Furthermore, since the pressing member 72 of the elastic roll 70 is elastically deformable, there is no need to highly precisely adjust the gap between the upper roll 111 and the pressure roll 113 (elastic roll 70) or the parallelism in the width direction.

[0078] <Modification> The configuration of the single facer is not limited to the above-described configuration. Fig. 10-2 is a schematic diagram showing a modification of the single facer of the second embodiment.

[0079] As shown in FIG. 10B, the single facer 13A has an upper fluted roll 111, a lower fluted roll 112, and a pressure roll 113.

[0080] The outer peripheral surface of the upper corrugated roll 111 is formed in a corrugated shape, and the outer peripheral surface of the lower corrugated roll 112 is formed in a corrugated shape similar to the upper corrugated roll 111. The lower corrugated roll 112 is disposed diagonally below the upper corrugated roll 111, and the outer peripheral surfaces of the upper corrugated roll 111 and the lower corrugated roll 112 mesh with each other via the single-faced corrugated cardboard sheet D1. The pressure rolls 113 are disposed to the sides of the lower corrugated roll 112, and multiple pressure rolls 113 (five in this embodiment) are provided at intervals in the circumferential direction. The multiple pressure rolls 113 have flat outer peripheral surfaces, and rotate together with the lower corrugated roll 112 by contacting the corrugated outer peripheral surface of the lower corrugated roll 112 via the single-faced corrugated cardboard sheet D1 using a pressing mechanism (not shown).

[0081] Furthermore, backup rolls 114 are arranged on the opposite side of the pressure rolls 113 from the lower roll 112, i.e., on the sides thereof. The backup rolls 114 are in contact with the pressure rolls 113 and rotate together with the pressure rolls 113. The backup rolls 114 receive the reaction force of the pressure rolls 113.

[0082] In the single facer 13A, the above-described elastic roll 70 is applied to the multiple pressure rolls 113. The elastic roll 70 has a main body 71 and multiple pressing members 72, as shown in FIG.

[0083] The back liner C1 is transferred between the lower corrugated roll 112 and the pressure roll 113 (elastic roll 70). Meanwhile, the corrugating medium B1 is transferred between the upper corrugated roll 111 and the lower corrugated roll 112. The corrugating medium B1 is then processed into a corrugated shape at the meshing portion between the upper corrugated roll 111 and the lower corrugated roll 112, and is then guided by the lower corrugated roll 112 and transferred between the lower corrugated roll 112 and the pressure roll 113 (elastic roll 70). At this time, the corrugated medium B1 comes into contact with the gluing roll 123 and is glued to the top of each corrugation. The glued medium B1 and back liner C1 are then transferred between the lower corrugated roll 112 and the pressure roll 113 (elastic roll 70) and bonded together to form a single-faced cardboard sheet D1.

[0084] When the medium B1 and the back liner C1 are stacked and fed between the lower roll 112 and the pressure roll 113 (elastic roll 70), the rotating elastic rolls 70 apply a pressing force to the medium B1 and the back liner C1. When the elastic rolls 70 press the medium B1 and the back liner C1, each pressing member 72 elastically deforms inward, generating an appropriate pressing force. As shown in FIG. 3 , each pressing member 72 elastically deforms toward the main body 71, with the fixed portion 83 serving as a fulcrum, and the tip end 72b moves while contacting the outer peripheral surface of the third portion 86 of the adjacent pressing member 72. Therefore, the third portion 86 of each pressing member 72 of the elastic roll 70 is constantly in contact with and pressing the medium B1 and the back liner C1. As a result, when the elastic roll 70 rotates, the fluctuations in the pressing force with which the elastic roll 70 presses the medium B1 and the back liner C1 are reduced, and the medium B1 and the back liner C1 can be pressed with an appropriate pressing force.

[0085] In the above-described embodiment, a plurality of elastic rolls 70 are used as a plurality of pressure rolls, but the present invention is not limited to this. For example, a single elastic roll 70 may be used as a pressure roll.

[0086] 11 is a schematic diagram showing a gluing device according to a third embodiment. Note that members having the same functions as those in the first embodiment described above are given the same reference numerals, and detailed descriptions thereof will be omitted.

[0087] As shown in Fig. 1, the corrugating machine 10 includes a glue machine 21. The glue machine 21 has gluing devices 44 and 45. Since the gluing devices 44 and 45 have substantially the same configuration, only one of the gluing devices, 45, will be described. As shown in Fig. 11, the gluing device 45 contacts and glues each top of the corrugations of the corrugation medium B1 in the heated single-faced cardboard sheet D1.

[0088] The gluing device 45 includes a gluing roll 141 , a glue dam 142 , a meter roll 143 , and a rider roll 144 .

[0089] The glue dam 142 stores a predetermined amount of glue. The gluing roll 141 applies the glue stored in the glue dam 142 to the medium B1 of the single-faced cardboard sheet D1 to perform gluing. The meter roll 143 rotates in contact with the outer peripheral surface of the gluing roll 141 to adjust the amount of glue applied to the outer peripheral surface of the gluing roll 141. The rider roll 144 is positioned opposite the gluing roll 141, sandwiching the single-faced cardboard sheet D1 between them. The rider roll 144 applies a pressing force to the single-faced cardboard sheet D1 to be glued by the gluing roll 141.

[0090] In the gluing device 45 of the glue machine 21, the rider roll 144 is the elastic roll 70 described above. As shown in Fig. 3, the elastic roll 70 has a main body 71 and a plurality of pressing members 72. In this case, in the gluing device 45 shown in Fig. 11, the elastic roll 70 is arranged in a state in which the plurality of pressing members 72 are wound counterclockwise (the state in Fig. 3). However, the plurality of pressing members 72 may also be arranged in a state in which they are wound clockwise.

[0091] 3 and 11, after being heated, the single-faced cardboard sheet D1 is guided by guide rolls 145 and 146 and then transferred between the gluing roll 141 and the rider roll 144 (elastic roll 70). At this time, the single-faced cardboard sheet D1 is sandwiched between the gluing roll 141 and the rider roll 144 (elastic roll 70), and the corrugated corrugated medium B1 comes into contact with the gluing roll 141 of the gluing device 44, thereby being glued to the tops of each flute.

[0092] When the single-faced cardboard sheet D1 passes between the gluing roll 141 and the rider roll 144 (elastic rolls 70), the rotating elastic rolls 70 apply a pressing force to the single-faced cardboard sheet D1. When the multiple elastic rolls 70 press the single-faced cardboard sheet D1, each pressing member 72 elastically deforms inward, generating an appropriate pressing force. At this time, each pressing member 72 elastically deforms so as to bend toward the main body portion 71, with the fixed portion 83 serving as a fulcrum, and the tip end 72b moves while contacting the outer peripheral surface of the third portion 86 of the adjacent pressing member 72.

[0093] That is, when the pressing members 72 press the single-faced cardboard sheet D1, the tip portions 72b of the pressing members 72 slide against the outer peripheral surfaces of the adjacent pressing members 72. Therefore, the third portions 86 of the pressing members 72 of the elastic roll 70 are constantly in contact with and pressing against the medium B1 and the back liner C1. As a result, when the elastic roll 70 rotates, the pressure with which the elastic roll 70 presses the single-faced cardboard sheet D1 is less variable, allowing the single-faced cardboard sheet D1 to be pressed with an appropriate pressure. Furthermore, because the pressing members 72 of the elastic roll 70 elastically deform, highly accurate adjustment of the gap between the gluing roll 141 and the rider roll 144 (elastic roll 70) and the parallelism in the width direction is not required.

[0094] [Fourth embodiment] Fig. 12 is a side view showing a guide device of a fourth embodiment, and Fig. 13 is a plan view showing the guide device. Note that members having the same functions as those in the first embodiment described above are given the same reference numerals, and detailed descriptions thereof will be omitted.

[0095] As shown in Fig. 1, the corrugating machine 10 includes a single facer 13. As shown in Fig. 10, the single facer 13 is provided with preheaters 131 and 132. The preheater 131 heats the back liner C1, and the preheater 132 heats the corrugating medium B1. As shown in Figs. 10, 12, and 13, guide devices 150 are disposed upstream of the preheaters 131 and 132, respectively.

[0096] As shown in Fig. 1, the corrugating machine 10 also includes a double facer 22. The double facer 22 is provided with a preheater 20. The preheater 20 has preheating rolls 41, 42, and 43. The preheating roll 41 heats the front liner A, the preheating roll 42 heats the single-faced cardboard sheet D2, and the preheating roll 43 heats the single-faced cardboard sheet D1. As shown in Figs. 1, 12, and 13, guide devices 150 are respectively disposed upstream of the preheating rolls 41, 42, and 43 in the preheater 20.

[0097] The guide device 150 has a guide roll 151. The guide roll 151 guides the back liner C1 (or the back liner C2, the cores B1 and B2, the front liner A, and the single-faced cardboard sheets D1 and D2) by wrapping them around it at a predetermined angle. In the guide device 150, the above-mentioned elastic roll 70 is used as the guide roll 151. As shown in FIG. 3, the elastic roll 70 has a main body 71 and multiple pressing members 72. In this case, in the guide device 150 shown in FIG. 12, the elastic roll 70 is arranged with the multiple pressing members 72 wound in a clockwise direction (the opposite state to that in FIG. 3). However, the multiple pressing members 72 may also be arranged with the multiple pressing members 72 wound in a counterclockwise direction.

[0098] As shown in Figures 3, 12, and 13, the rear liner C1 is wound around and guided by a guide roll 151 (elastic roll 70). As the rear liner C1 is wound around and guided by the guide roll 151 (elastic roll 70), the rotating elastic rolls 70 apply a pressing force to the rear liner C1. When the elastic rolls 70 press the rear liner C1, each pressing member 72 elastically deforms inward, generating an appropriate pressing force. At this time, the pressing member 72 elastically deforms so as to bend toward the main body portion 71, with the fixed portion 83 serving as a fulcrum, and the tip portion 72b moves while contacting the outer peripheral surface of the third portion 86 of the adjacent pressing member 72.

[0099] That is, when the pressing members 72 press the back liner C1, the tip portions 72b slide against the outer peripheral surfaces of the adjacent pressing members 72. Therefore, the third portions 86 of the pressing members 72 of the elastic roll 70 are always in contact with and pressing against the back liner C1. As a result, when the elastic roll 70 rotates, the fluctuations in the pressing force with which the elastic roll 70 presses the back liner C1 are reduced, and the back liner C1 can be pressed with an appropriate pressing force.

[0100] Furthermore, since the pressing members 72 are elastic members and can deform differently in the width direction, even if the tension in the width direction of the rear liner C1 is different, each pressing member 72 adjusts the tension in the width direction of the rear liner C1 uniformly. Therefore, the rear liner C1 contacts the outer peripheral surface of the preheater with a uniform pressing force in the width direction. Therefore, the rear liner C1 can be heated uniformly in the width direction.

[0101] 14 is a schematic diagram showing a conveying device according to a fifth embodiment. Note that members having the same functions as those in the first embodiment described above are given the same reference numerals, and detailed descriptions thereof will be omitted.

[0102] As shown in Figures 1 and 14, the corrugating machine 10 has a conveying device 160 that conveys the front liner A, the core B1, the back liner C1, the single-faced cardboard sheets D1 and D2, and the double-faced cardboard sheets E and F.

[0103] The conveying device 160 has a first roll 161 and a second roll 162. The first roll 161 and the second roll 162 are arranged facing each other in the vertical direction. However, the first roll 161 and the second roll 162 may also be arranged facing each other horizontally or diagonally. The first roll 161 and the second roll 162 are freely rotatable rolls. However, the first roll 161 and the second roll 162 may also be driven to rotate. The first roll 161 and the second roll 162 sandwich and convey sheets S, such as a back liner C1, a medium B1, a front liner A, and single-faced cardboard sheets D1 and D2.

[0104] In the conveying device 160, the first roll 161 is the elastic roll 70 described above. However, the second roll 162 may also be the elastic roll 70. As shown in FIG. 3, the elastic roll 70 has a main body 71 and a plurality of pressing members 72. In this case, in the conveying device 160 shown in FIG. 14, the elastic roll 70 is arranged in a state where the plurality of pressing members 72 are wound in a clockwise direction (the opposite state to that in FIG. 3). However, the plurality of pressing members 72 may also be arranged in a state where they are wound in a counterclockwise direction.

[0105] As shown in FIGS. 3 and 14 , the sheet S is transported between the first roll 161 (elastic roll 70) and the second roll 162. At this time, the sheet S is conveyed while being sandwiched between the first roll 161 (elastic roll 70) and the second roll 162. When the sheet S passes between the first roll 161 (elastic roll 70) and the second roll 162, the rotating multiple elastic rolls 70 apply a pressing force to the sheet S. When the multiple elastic rolls 70 press the sheet S, each pressing member 72 elastically deforms inward, thereby generating an appropriate pressing force. At this time, each pressing member 72 elastically deforms so as to bend toward the main body portion 71 with the fixed portion 83 side as a fulcrum, and moves while the tip portion 72 b contacts the outer peripheral surface of the third portion 86 of the adjacent pressing member 72.

[0106] That is, when the pressing members 72 press the sheet S, the tip portions 72b slide against the outer peripheral surfaces of the adjacent pressing members 72 while pressing. Therefore, the third portions 86 of the pressing members 72 of the elastic roll 70 are constantly in contact with and pressing the sheet S. As a result, when the elastic roll 70 rotates, fluctuations in the pressing force with which the elastic roll 70 presses the sheet S are reduced, and the sheet S can be pressed with an appropriate pressing force. Furthermore, because the pressing members 72 of the elastic roll 70 elastically deform, it is not necessary to highly precisely adjust the gap between the first roll 161 (elastic roll 70) and the second roll 162 or the parallelism in the width direction.

[0107] [Effects of this embodiment] The elastic roll according to the first aspect includes a main body 71 and a plurality of pressing members 72 that are arc-shaped, elastically deformable, and spaced apart in the circumferential direction on the outer periphery of the main body 71. Each pressing member 72 has a base end 72a in the longitudinal direction fixed to the outer periphery of the main body 71 and curved toward a tip end 72b, and the tip end 72b can slide against the outer periphery of the pressing member 72 that is circumferentially adjacent to it.

[0108] According to the elastic roll of the first aspect, when the elastic rolls 70, 70A, and 70B rotate together with the sheet, the multiple pressing members 72 elastically deform inward, generating an appropriate pressing force. That is, in the elastic roll 70, each pressing member 72 elastically deforms toward the main body 71, generating a pressing force that presses the sheet, and at this time, the tip end 72b of each pressing member 72 slides against the outer peripheral surface of the adjacent pressing member 72. Therefore, when the elastic rolls 70, 70A, and 70B rotate, each pressing member 72 comes into contact with and presses the sheet, reducing fluctuations in the pressing force that presses the sheet, allowing the sheet to be pressed with an appropriate pressing force, thereby enabling stable sheet transport.

[0109] The elastic roll according to the second aspect is the elastic roll according to the first aspect, further comprising: a fixed portion 83 fixed to the outer periphery of the main body portion 71; a first portion 84 extending from the fixed portion 83 toward the tip portion 72 b; a second portion 85 extending from the first portion 84 toward the tip portion 72 b; and a third portion 86 extending from the second portion 85 toward the tip portion 72 b, wherein the second portion 85 and the third portion 86 are curved, the second portion 85 smoothly connects the first portion 84 and the third portion 86, and the curvature of the second portion 85 is greater than the curvature of the third portion 86. As a result, when the rotating elastic rolls 70, 70A, 70B contact the sheet, the pressing member 72 elastically deforms, and the tip portion 72 b of the third portion 86 appropriately slides against the outer periphery of the pressing member 72 adjacent in the circumferential direction, thereby applying an appropriate pressing force to the sheet.

[0110] The elastic roller according to the third embodiment is the elastic roller according to the second embodiment, and further includes a curved first portion 84. This allows the pressing member 72 to be appropriately elastically deformed when the rotating elastic rollers 70, 70A, and 70B contact the sheet.

[0111] The elastic roll according to the fourth aspect is the elastic roll according to any one of the first to third aspects, and further, the tip portions 72b of the pressing members 72 contact the outer peripheral surfaces of the circumferentially adjacent pressing members 72. This allows an appropriate pressing force to be applied to the sheet when the elastic rolls 70, 70A, and 70B rotate.

[0112] The elastic roll according to the fifth aspect is the elastic roll according to any one of the first to third aspects, and further, the tip end 72b of the pressing member 72 is positioned with a gap between it and the outer peripheral surface of the circumferentially adjacent pressing member 72. As a result, when the elastic rolls 70, 70A, 70B rotate, the tip end 72b of the pressing member 72 comes into contact with the outer peripheral surface of the circumferentially adjacent pressing member 72, thereby applying an appropriate pressing force to the sheet.

[0113] The elastic roll according to a sixth aspect is the elastic roll according to any one of the first to fifth aspects, and furthermore, one surface of the base end 72a of the pressing member 72 forms an acute angle with respect to the outer peripheral surface of the main body 71, and the other surface of the base end 72a forms an obtuse angle with respect to the outer peripheral surface of the main body 71. This allows the pressing member 72 to appropriately elastically deform with the base end 72a as a fulcrum.

[0114] The elastic roll according to the seventh aspect is the elastic roll according to any one of the first to sixth aspects, and further, the pressing member 72 is fixed by having the base end 72a fitted into a slit 82 formed in the outer peripheral surface of the main body 71. This improves the ease of assembling the pressing member to the main body 71.

[0115] An elastic roll according to an eighth aspect is the elastic roll according to any one of the first to seventh aspects, and further includes a base end 72a of the pressing member 72 fixed to the outer periphery of the main body 71 with an adhesive. This improves the ease of assembling the pressing member to the main body 71. Furthermore, the use of an adhesive can prevent welding defects during welding fixation, breakage due to hardening, and the like.

[0116] The elastic roller according to the ninth aspect is the elastic roller according to any one of the first to eighth aspects, and furthermore, the thickness of the pressing member 72 is constant from the base end 72 a to the tip end 72 b. This ensures an appropriate elastic force in the pressing member 72. Furthermore, the pressing member 72 is easy to manufacture.

[0117] The elastic roll according to a tenth aspect is the elastic roll according to any one of the first to ninth aspects, and further includes a tapered surface 87 at the tip end 72b of each pressing member 72, which faces the outer circumferential surface of the circumferentially adjacent pressing member 72. This allows the tip end 72b to be in appropriate sliding contact with the outer circumferential surface of the pressing member 72 when the pressing member 72 elastically deforms and the tip end 72b comes into contact with the outer circumferential surface of the circumferentially adjacent pressing member 72. Furthermore, this eliminates a step formed by the tip end 72b and the outer circumferential surface of the adjacent pressing member 72, allowing an appropriate pressing force to be applied in the circumferential direction of the elastic roll 70.

[0118] The elastic roll according to the eleventh aspect is the elastic roll according to any one of the first to tenth aspects, and further includes a cylindrical elastic member 73 disposed outside the plurality of pressing members 72. As a result, in the elastic roll 70B, the plurality of pressing members 72 apply a pressing force to the sheet via the elastic member 73, and a uniform pressing force can be applied overall.

[0119] The elastic roll according to a twelfth aspect is the elastic roll according to any one of the first to eleventh aspects, further comprising: the main body 71 having a plurality of divided main body portions divided in the axial direction; and the plurality of pressing members 72 having a plurality of divided pressing members provided on the outer peripheries of the plurality of divided main body portions. This allows the shape of the elastic roll 70A to be set to a desired shape.

[0120] The elastic roll according to the thirteenth aspect is the elastic roll according to the twelfth aspect, and further, the divided pressing members are fixed to the divided main bodies at different phases, so that the elastic roll 70A can apply a uniform pressing force to the sheet as a whole.

[0121] In the roll unit according to the fourteenth aspect, a plurality of elastic rolls 70, 70A, 70B according to any one of the first to thirteenth aspects are arranged in a staggered pattern, thereby reducing the pressureless state in the sheet conveying direction and allowing a stable pressing force to be applied.

[0122] The double facer according to the fifteenth aspect includes a heating plate 51 arranged along the sheet conveying direction, and a plurality of pressure rolls 52 arranged above the heating plate 51 at intervals in the sheet conveying direction to sandwich the plurality of sheets between the heating plate 51, and the elastic rolls 70, 70A, 70B according to any one of the first to thirteenth aspects are used as the pressure rolls. As a result, when the elastic rolls 70, 70A, 70B rotate, the respective pressing members 72 press the single-faced cardboard sheets D1, D2 and the front liner A, reducing fluctuations in the pressing force pressing the single-faced cardboard sheets D1, D2 and the front liner A, and allowing the single-faced cardboard sheets D1, D2 and the front liner A to be pressed with an appropriate pressing force, thereby enabling stable lamination of the single-faced cardboard sheets D1, D2 and the front liner A.

[0123] The single facer of the 16th aspect comprises an upper roll 111 and a lower roll 112 whose wavy outer peripheries mesh with each other to corrugate the sheet, and a pressure roll 113 arranged on the outer periphery of at least one of the upper roll 111 and the lower roll 112 to sandwich the back liner C1 and the corrugated core B1, and an elastic roll 70, 70A, or 70B of any one of the first to thirteenth aspects is applied as the pressure roll 113. As a result, when the elastic rolls 70, 70A, 70B rotate, each pressing member 72 presses the cores B1, B2 and the back liners C1, C2, reducing fluctuations in the pressing force pressing the cores B1, B2 and the back liners C1, C2, allowing the cores B1, B2 and the back liners C1, C2 to be pressed with an appropriate pressing force, thereby enabling stable bonding of the cores B1, B2 and the back liners C1, C2.

[0124] The gluing device according to the seventeenth aspect includes a glue dam 142, a gluing roll 141 that scoops up glue stored in the glue dam 142, and a rider roll 144 that is disposed on the outer periphery of the gluing roll 141 and sandwiches single-faced cardboard sheets D1, D2 between the gluing roll 141, and the rider roll 144 is an elastic roll 70, 70A, or 70B according to any one of the first to thirteenth aspects. As a result, when the elastic rolls 70, 70A, or 70B rotate, the pressing members 72 press the single-faced cardboard sheets D1, D2, reducing fluctuations in the pressing force pressing the single-faced cardboard sheets D1, D2 and allowing the single-faced cardboard sheets D1, D2 to be pressed with an appropriate pressing force, thereby enabling stable gluing of the single-faced cardboard sheets D1, D2.

[0125] The guide device according to the eighteenth aspect includes a guide roll 151 that guides sheets (front liner A, core B1, back liner C1, single-faced cardboard sheets D1, D2, double-faced cardboard sheets E, F) by wrapping them around a portion of the circumferential direction of the outer circumferential surface, and the elastic rolls 70, 70A, 70B according to any one of the first to thirteenth aspects are used as the guide roll 151. As a result, when the elastic rolls 70, 70A, 70B rotate, each pressing member 72 presses the sheet (back liners C1, C2, core B1, B2, front liner A, single-faced cardboard sheets D1, D2), reducing fluctuations in the pressing force pressing the sheet and allowing the sheet to be pressed with an appropriate pressing force, thereby making it possible to uniform the tension in the width direction of the sheet.

[0126] The conveying device according to the 19th aspect includes a first roll 161 that contacts the front surface of the sheets (front liner A, core B1, back liner C1, single-faced corrugated cardboard sheets D1 and D2, and double-faced corrugated cardboard sheets E and F) and a second roll 162 that contacts the back surface of the sheets, and the elastic rolls 70, 70A, and 70B according to any one of the first to thirteenth aspects are used as the first roll 161 or the second roll 162. As a result, when the elastic rolls 70, 70A, and 70B rotate, each pressing member 72 presses the sheet S, reducing fluctuations in the pressing force pressing the sheet S and allowing the sheet S to be pressed with an appropriate pressing force, thereby enabling stable conveyance of the sheet S.

[0127] In the above-described embodiment, the elastic rolls 70, 70A, and 70B are described as pressing the front liner A, core B1, back liner C1, single-sided cardboard sheets D1 and D2, and double-sided cardboard sheets E and F, but the sheets pressed by the elastic rolls 70, 70A, and 70B are not limited to cardboard sheets, and can also be applied to other paper sheets, resin sheets, metal sheets, etc.

[0128] 10 Corrugating machine (corrugated cardboard sheet manufacturing device) 11, 12, 15, 16, 19 Mill roll stand 13, 13A, 17 Single facer 14, 18 Bridge 20 Preheater 21 Glue machine 22 Double facer 23 Rotary shear 24 Slitter scorer 25 Cutoff 26 Defective product ejection device 27 Stacker 28, 29 Pick-up conveyor 30 Paper guide device 31, 32, 33, 34, 35 Splicer 41, 42, 43 Preheating roll 44, 45 Gluing device 46, 47 Slitter scorer unit 51 Heating plate 52 Pressure roll 53 Pressure belt 70, 70A Elastic roll 70a, 70b, 70c Divided elastic roll 71 Main body 72 Pressing member 72a Base end 72b Tip portion 73 Elastic member 81 Through hole 82 Slit 83 Fixing portion 84 First portion 85 Second portion 86 Third portion 87 Tapered surface 91 Support shaft 92 Support arm 93 Bearing 100 Roll unit 111 Upper roll 112 Lower roll 113 Pressure roll 114 Backup roll 131, 132 Preheater 141 Gluing roll 142 Glue dam 143 Meter roll 144 Rider roll 150 Guide device 151 Guide roll 160 Conveying device 161 First roll 162 Second roll A Front liner (sheet) B1, B2 Core (sheet) C1, C2 Back liner (sheet) D1, D2 Single-faced cardboard sheet (sheet) E, F Double-faced cardboard sheet (sheet)

Claims

1. An elastic roll comprising: a main body; and a plurality of elastically deformable arc-shaped pressing members provided at intervals in the circumferential direction on the outer periphery of the main body, wherein the base ends in the longitudinal direction of the pressing members are fixed to the outer periphery of the main body, and the pressing members are shaped to curve toward their tip ends, and the tip ends are capable of sliding contact with the outer periphery of the pressing members adjacent in the circumferential direction.

2. The elastic roll according to claim 1, wherein the pressing member has a fixed portion fixed to the outer periphery of the main body portion, a first portion extending from the fixed portion toward the tip portion, a second portion extending from the first portion toward the tip portion, and a third portion extending from the second portion toward the tip portion, at least the second portion and the third portion being curved, the second portion smoothly connecting the first portion and the third portion, and having a curvature greater than that of the third portion.

3. The elastic roll according to claim 2, wherein the first portion has a curved shape.

4. An elastic roll according to claim 1 or claim 2, wherein the tip of the pressing member contacts the outer circumferential surface of the pressing member adjacent in the circumferential direction.

5. An elastic roll according to claim 1 or 2, wherein the tip of each of the pressing members is positioned with a gap between it and the outer peripheral surface of the pressing member adjacent thereto in the circumferential direction.

6. The elastic roll according to claim 1, wherein one surface of the base end of the pressing member forms an acute angle with the outer circumferential surface of the main body, and the other surface of the base end forms an obtuse angle with the outer circumferential surface of the main body.

7. The elastic roll according to claim 1, wherein the base end of the pressing member is fitted into a slit formed in the outer peripheral surface of the main body and fixed thereto.

8. The elastic roll according to claim 1, wherein the base end of the pressing member is fixed to the outer periphery of the main body with an adhesive.

9. The elastic roll according to claim 1, wherein the pressing member has a constant thickness from the base end to the tip end.

10. The elastic roll according to claim 1, wherein the pressing member has a tapered surface at the tip portion facing the outer peripheral surface of the pressing member adjacent in the circumferential direction.

11. The elastic roll according to claim 1, further comprising a cylindrical elastic member disposed outside the plurality of pressing members.

12. The elastic roll according to claim 1, wherein the main body has a plurality of divided main body portions divided in the axial direction, and the plurality of pressing members have a plurality of divided pressing members provided on the outer peripheries of the plurality of divided main body portions.

13. The elastic roll according to claim 12, wherein the plurality of divided pressing members are fixed to the plurality of divided main body portions at different phases.

14. A roll unit in which a plurality of elastic rolls according to claim 1 are arranged in a staggered pattern.

15. A double facer comprising: a heating plate arranged along the sheet transport direction; and pressure rolls arranged above the heating plate at intervals in the sheet transport direction and clamping a plurality of sheets between the heating plate and the pressure roll; wherein the elastic roll described in claim 1 is used as the pressure roll.

16. A single facer comprising upper and lower rolls whose outer peripheries, which form a wave shape, mesh with each other to form a wave shape, thereby corrugating a sheet; and a pressure roll disposed on the outer periphery of at least one of the upper and lower rolls, said upper or lower roll, for clamping a flat sheet and a corrugated sheet, wherein the elastic roll described in claim 1 is used as the pressure roll.

17. A gluing device comprising: a glue dam; a gluing roll that scoops up the glue stored in the glue dam; and a rider roll that is arranged on the outer periphery of the gluing roll and that holds a sheet between the rider roll and the gluing roll, wherein the elastic roll described in claim 1 is used as the rider roll.

18. A guide device comprising a guide roll for guiding a sheet by wrapping it around a portion of the outer circumferential surface in the circumferential direction, wherein the elastic roll according to claim 1 is used as the guide roll.

19. A conveying device comprising: a first roll that contacts the front surface of a sheet; and a second roll that contacts the back surface of the sheet, wherein the elastic roll according to claim 1 is used as the first roll or the second roll.

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