Automatic sheet dehairing device

Abstract

The utility model discloses an automatic dehairing device for sheets, which comprises a support frame provided with a sueding component and a pressing roller for pressing the sheets on the sueding component; the sueding assembly comprises a rotating shaft rotationally connected to the supporting frame, the rotating shaft is sleeved with a sueding rotating roller, inclined guide plates are arranged at the two ends of the sueding rotating roller, inclined guide grooves are formed between the inclined guide plates and the sueding rotating roller which are oppositely arranged, at least part of the periphery of the abutting rotating roller is movably embedded in the inclined guide grooves, and the sheet movably penetrates through the inclined guide grooves. The two sides of the sheet make contact with the abutting rotating roller and the sanding rotating roller correspondingly. The utility model discloses an automatic sheet dehairing device which has good material guiding and sanding operability, can realize sanding operation on the front surface or the back surface of a sheet according to actual requirements, and can collect waste materials.

Description

TECHNICAL FIELD

[0001] The utility model relates to sheet production technical field especially relates to a sheet automatic scraping device. BACKGROUND

[0002] In the sheet production process, due to the surface of sheet is too smooth, causes surface adhesion to be poor, so that the adhesion of the coated glue layer is poor, and it is easy to tear. However, in the prior art, the flexible sheet edge grinding operation is not convenient enough, and since the sheet is flexible, the grinding operation is not convenient to force.

[0003] In order to solve the problem of poor adhesion caused by smooth surface, it is urgent to develop a sheet automatic scraping device which can be set in the production line. UTILITY MODEL CONTENTS

[0004] The utility model overcomes the insufficient of prior art, provides a sheet automatic scraping device, has good material guiding and grinding operation, can realize grinding operation on the front side of sheet or the back side of sheet according to actual demand, and collects waste materials.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme that a sheet automatic scraping device, it includes: support frame, is provided with grinding assembly and the pressing roller that presses sheet on grinding assembly on support frame;Grinding assembly includes the shaft connected on support frame, the grinding roller is set on the shaft, and the both ends of grinding roller are provided with guide inclined plate, the guide inclined groove is formed between the oppositely arranged guide inclined plate and grinding roller, and the outer periphery of pressing roller is at least partially movably embedded in guide inclined groove, and the sheet is movably threaded through guide inclined groove, and the two sides of sheet are respectively contacted with pressing roller and grinding roller.

[0006] In a preferred embodiment of the utility model, the support frame is provided with the material guide frame one and the material guide frame two which are longitudinally spaced, the material guide frame one and the material guide frame two are located on the feeding side of grinding assembly, the upper layer material guide roller and the lower layer material guide roller for guiding material are respectively rotatably connected on the material guide frame one and the material guide frame two, the sheet is threaded between the upper layer material guide roller and the lower layer material guide roller, and is in rolling contact with the upper layer material guide roller and the lower layer material guide roller.

[0007] In a preferred embodiment of the utility model, the grinding assembly further includes the motor arranged on the support frame, the grinding roller is fixedly sleeved on the shaft, the shaft is rotatably connected on the support frame through bearing seat and bearing, and one end of the shaft is drivingly connected with the motor.

[0008] In a preferred embodiment of the utility model, the lower portion of grinding assembly is provided with the suction dust removal assembly corresponding to grinding roller;The suction dust removal assembly is used for sucking and collecting the waste debris generated by grinding sheet on the grinding roller of grinding assembly.

[0009] In a preferred embodiment of the utility model, the suction dust removal assembly comprises a suction box arranged below the sanding roller, the upper part of the suction box is provided with a suction groove corresponding to the sanding roller, the lower part of the suction box is provided with a fan, the suction port of the fan corresponds to the suction groove, and the discharge port of the fan is connected with the feeding port of the dust collection bag.

[0010] In a preferred embodiment of the utility model, the sanding roller is further provided with a dusting shaft, and the dusting shaft is provided with a brush in contact with the outer surface of the sanding roller.

[0011] In a preferred embodiment of the utility model, the rotation axes of the sanding roller, the pressing roller, the upper layer material guide roller and the lower layer material guide roller are parallel to each other, and the material guide tracks of the first material guide frame and the second material guide frame intersect with the rotation axes.

[0012] In a preferred embodiment of the utility model, the setting axis of the dusting shaft is parallel to the rotation axis of the sanding roller.

[0013] And / or, the material guide tracks of the first material guide frame and the second material guide frame are perpendicular to the rotation axes or the setting axes.

[0014] In a preferred embodiment of the utility model, when the sheet is guided into the pressing rollers on the feeding side of the sanding roller from the sanding roller, the outer side of the sheet is sanded, the rotation direction of the motor is the same as the conveying direction of the sheet.

[0015] Or, when the sheet is guided into the pressing rollers on the discharging side of the sanding roller from the sanding roller, the inner side of the sheet is sanded, the rotation direction of the motor is opposite to the conveying direction of the sheet.

[0016] Or, the frictional resistance of the sanding roller to the sheet is smaller than the transmission driving force of the sheet.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] The utility model discloses a sheet automatic scraping device has good material guide and sanding operability, can realize sanding operation to the front of sheet or the back of sheet according to actual demand, and collects waste materials.

[0019] The sheet that wears sanding is limited and guided through the guide inclined plate of the guide inclined groove, and deviation out of the sanding area in the process of conveying sanding is prevented.

[0020] When dust removal is needed, the waste debris in the sanding process is collected by opening the fan.

[0021] When the waste debris on the sanding roller needs to be cleaned, the sanding roller is driven to rotate by the motor, and the dusting shaft is fixedly arranged on the support frame. The outer surface of the rotating sanding roller is cleaned by the brush fixedly arranged on the dusting shaft, and the waste debris attached to the outer surface of the sanding roller is brushed off, thereby further improving the effectiveness of the sanding operation of the sanding roller on the sheet material.

[0022] For the front side or the back side of the sanding sheet, on the one hand, the contact surface of the sheet with the guide roller is adjusted by the guide of the upper guide roller and the lower guide roller, or the guide chute through which the sheet passes between the sanding roller and the inner abutting pressure roller or the guide chute through which the sheet passes between the sanding roller and the outer abutting pressure roller is adjusted, so as to change the sanding surface of the sheet. BRIEF DESCRIPTION OF DRAWINGS

[0023] The utility model will be further explained in connection with the drawings and embodiments.

[0024] Figure 1 is a structure schematic of a sheet automatic scraping device of the present application Figure One (the abutting pressure roller is arranged on the feeding side of the sanding roller);

[0025] Figure 2 is a structure schematic of a sheet automatic scraping device of the present application Figure Two ;

[0026] Figure 3 is a structure schematic of a sheet automatic scraping device of the present application Figure Three (the abutting pressure rollers are arranged on the feeding side and the discharging side of the sanding roller, i.e. a pair of abutting pressure rollers are arranged on the upper and lower sides of the sanding roller);

[0027] Figure 4 is a structure schematic of a sheet automatic scraping device of the present application Figure Four ;

[0028] Figure 5 is a structure schematic of a sheet automatic scraping device of the present application Figure Five ;

[0029] Among them, 1- support frame, 2- guide frame one, 21- upper layer guide roller, 3- guide frame, 31- lower layer guide roller, 4- sanding assembly, 41- rotating shaft, 42- sanding roller, 43- guide chute, 431- guide inclined plate, 5- abutting pressure roller, 6- suction dust removal assembly, 61- suction box, 62- suction groove, 63- fan, 64- dust collection bag; 7- dusting shaft, 8- brush, 9- motor, 91- sheet. DETAILED DESCRIPTION

[0030] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features therein are detailed descriptions of the present invention, rather than limitations thereof. In the absence of conflict, the embodiments of the present invention and the technical features therein can be combined with each other.

[0031] The term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship. Example 1

[0032] like Figures 1-3 As shown, an automatic sheet scraping device includes: a support frame 1, on which a scraping component 4 and a pressing roller 5 pressing a sheet 91 against the scraping component 4 are disposed; the support frame 1 is provided with a longitudinally spaced guide frame 2 and a guide frame 3, which are located on the feeding side of the scraping component 4. An upper guide roller 21 and a lower guide roller 31 for guiding the material are rotatably connected to the guide frame 2 and the guide frame 3, respectively. The sheet 91 passes between the upper guide roller 21 and the lower guide roller 31 and rolls in contact with them. The assembly relationship of the upper guide roller 21 and the lower guide roller 31 rotatably connected to the guide frame 2 and the guide frame 3 adopts a conventional rotatable connection structure in the prior art. As long as a rotatable connection can be achieved, the specific assembly connection relationship will not be described in detail here.

[0033] Specifically, the sanding assembly 4 includes a rotating shaft 41 rotatably connected to the support frame 1. A sanding roller 42 is sleeved on the rotating shaft 41, and guide plates 431 are provided at both ends of the sanding roller 42. A guide groove 43 is formed between the guide plates 431 and the sanding roller 42, and at least part of the outer periphery of the pressing roller 5 is movably embedded in the guide groove 43. The sheet 91 moves through the guide groove 43, and both sides of the sheet 91 are in contact with the pressing roller 5 and the sanding roller 42, respectively. The assembly relationship of the pressing roller 5 and the support frame 1 rotatably connects using a conventional rotatable connection structure in the prior art. As long as a rotatable connection can be achieved, the specific assembly relationship will not be described in detail here.

[0034] Furthermore, the rotation axes of the grinding roller 42, the pressing roller 5, the upper guide roller 21, and the lower guide roller 31 are parallel to each other, and the guide tracks of the first guide frame 2 and the second guide frame 3 intersect with the rotation axes. And / or, the guide tracks of the first guide frame 2 and the second guide frame 3 are perpendicular to the rotation axes or the setting axes. Example 2

[0035] As Figures 1-3 shown, a sheet automatic scraping device, comprising: a support frame 1, the support frame 1 is provided with a scraping assembly 4 and a pressing roller 5 for pressing the sheet 91 against the scraping assembly 4; the support frame 1 is provided with a guide frame one 2 and a guide frame two 3 which are longitudinally spaced apart, the guide frame one 2 and the guide frame two 3 are located at the feeding side of the scraping assembly 4, the guide frame one 2 and the guide frame two 3 are respectively rotatably connected with an upper layer guide roller 21 and a lower layer guide roller 31 for guiding the sheet 91, the sheet 91 is arranged between the upper layer guide roller 21 and the lower layer guide roller 31 and is in rolling contact with the upper layer guide roller 21 and the lower layer guide roller 31. The assembly relationship between the upper layer guide roller 21 and the lower layer guide roller 31 and the guide frame one 2 and the guide frame two 3 adopts the conventional rotating connection structure in the prior art, as long as the rotating connection can be achieved, the specific assembly connection relationship is not described here.

[0036] Specifically, the scraping assembly 4 comprises a motor 9 arranged on the support frame 1, a scraping roller 42 is fixedly sleeved on a rotating shaft 41, the rotating shaft 41 is rotatably connected to the support frame 1 through a bearing seat and a bearing, and one end of the rotating shaft 41 is drivingly connected to the motor 9. When the sheet 91 is guided into the pressing roller 5 from the pressing roller 5 located at the feeding side of the scraping roller 42, the outer side of the sheet 91 is scraped, the rotating direction of the motor 9 is the same as the conveying direction of the sheet 91 (that is, in this embodiment, when the sheet 91 is conveyed downward, the side of the scraping roller 42 in contact with the sheet 91 is rotated upward (clockwise) for scraping).

[0037] Further, the two ends of the scraping roller 42 sleeved on the rotating shaft 41 are provided with guide inclined plates 431, the guide inclined plates 431 oppositely arranged form a guide inclined groove 43 between the guide inclined plates 431 and the scraping roller 42, the outer periphery of the pressing roller 5 is at least partially movably embedded in the guide inclined groove 43, the sheet 91 movably passes through the guide inclined groove 43, and the two sides of the sheet 91 are respectively in contact with the pressing roller 5 and the scraping roller 42. The assembly relationship between the pressing roller 5 and the support frame 1 adopts the conventional rotating connection structure in the prior art, as long as the rotating connection can be achieved, the specific assembly connection relationship is not described here.

[0038] More specifically, the frictional resistance of the sanding roller 42 to the sheet 91 is less than the driving force of the sheet 91. One end of the sheet 91 is connected to the feeding driving shaft of the external device for feeding driving, and the other end of the sheet 91 is connected to the winding driving shaft of the external device for winding driving. The sheet 91 is released by the driving rotation of the feeding driving shaft and the winding driving shaft. In the process of meeting the release winding operation of feeding and winding, the sheet 91 is tensioned between the sanding roller 42 and the pressing roller 5, and between the upper guide roller 21 and the lower guide roller 31. The rotation axes of the sanding roller 42, the pressing roller 5, the upper guide roller 21 and the lower guide roller 31 are parallel to each other, and the guide tracks of the guide frame one 2 and the guide frame two 3 intersect with the rotation axes. Further, the guide tracks of the guide frame one 2 and the guide frame two 3 are perpendicular to the rotation axes or the setting axes.

[0039] Further, the other end of the sheet 91 is connected to the winding driving shaft of the external device for winding driving. In the process of meeting the release winding operation of feeding and winding, the sheet 91 is tensioned between the sanding roller 42 and the pressing roller 5, and between the upper guide roller 21 and the lower guide roller 31. Embodiment three

[0040] As shown in Figures 1-4 An automatic sheet sanding device, comprising: a support frame 1, the support frame 1 is provided with a sanding assembly 4 and a pressing roller 5 for pressing the sheet 91 against the sanding assembly 4; the support frame 1 is provided with a guide frame one 2 and a guide frame two 3 which are longitudinally spaced apart, the guide frame one 2 and the guide frame two 3 are located on the feeding side of the sanding assembly 4, and the guide frame one 2 and the guide frame two 3 are respectively rotatably connected with an upper guide roller 21 and a lower guide roller 31 for guiding, the sheet 91 is arranged between the upper guide roller 21 and the lower guide roller 31 and in rolling contact with the upper guide roller 21 and the lower guide roller 31.

[0041] Specifically, the sanding assembly 4 includes a motor 9 arranged on the support frame 1, and the sanding roller 42 is fixedly sleeved on the rotating shaft 41, the rotating shaft 41 is rotatably connected to the support frame 1 through a bearing seat, and one end of the rotating shaft 41 is drivingly connected to the motor 9. When the sheet 91 is guided between the pressing rollers 5 on the feeding side of the sanding roller 42, the outer side of the sheet 91 is sanded, the rotating direction of the motor 9 is the same as the conveying direction of the sheet 91 (that is, in the embodiment, when the sheet 91 is conveyed downward, the side of the sanding roller 42 in contact with the sheet 91 is rotated upward (clockwise) for sanding). But not limited to this, in other embodiments, when the sheet 91 is guided between the pressing rollers 5 on the discharging side of the sanding roller 42, the inner side of the sheet 91 is sanded, the rotating direction of the motor 9 is opposite to the conveying direction of the sheet 91 (that is, when the sheet 91 is conveyed downward, the side of the sanding roller 42 in contact with the sheet 91 is rotated upward (counterclockwise) for sanding).

[0042] Moreover, the two ends of the sanding roller 42 sleeved on the rotating shaft 41 are provided with guide inclined plates 431, the guide inclined plates 431 oppositely arranged and the sanding roller 42 form a guide inclined groove 43, the outer periphery of the pressing roller 5 is movably embedded in the guide inclined groove 43, and the sheet 91 movably passes through the guide inclined groove 43, and the two sides of the sheet 91 are respectively in contact with the pressing roller 5 and the sanding roller 42.

[0043] More specifically, the frictional resistance of the sanding roller 42 to the sheet 91 is less than the driving force of the sheet 91. One end of the sheet 91 is connected to the feeding driving rotating shaft of the external device for feeding driving, and the other end of the sheet 91 is connected to the winding driving rotating shaft of the external device for discharging driving, and the sheet 91 is released by the driving rotation of the feeding driving rotating shaft and the winding driving rotating shaft, and in the process of meeting the release winding operation of feeding and discharging, the sheet 91 is tensioned between the sanding roller 42, the pressing roller 5, the upper guide roller 21 and the lower guide roller 31. The rotating axes of the sanding roller 42, the pressing roller 5, the upper guide roller 21 and the lower guide roller 31 are parallel to each other, and the guide tracks of the guide frame one 2 and the guide frame two 3 intersect with the rotating axes. Further, the guide tracks of the guide frame one 2 and the guide frame two 3 are perpendicular to the rotating axes or the arranged axes. The outer surface of the sanding roller 42 is provided with a burr structure or a brush or a steel brush for sanding the outer surface of the sheet 91, and the sanding depth of the sanding structure or the brush or the steel brush of the sanding roller 42 is lower than the thickness of the sheet 91, so as to avoid excessive sanding of the sheet 91.

[0044] Furthermore, the feeding drive shaft of the external device is connected to the feeding drive shaft for feeding; the other end of the sheet 91 is connected to the winding drive shaft of the external device for winding. The feeding drive shaft and the winding drive shaft at both ends are driven to rotate and release, so that the tension of the sheet 91 between the abrasive roller 42 and the pressure roller 5, as well as the upper guide roller 21 and the lower guide roller 31, is tightened during the feeding and winding operations.

[0045] Furthermore, a suction dust removal component 6 corresponding to the grinding roller 42 is provided below the grinding assembly 4. The suction dust removal component 6 is used to suction and collect the waste debris generated by the grinding roller 42 grinding the sheet 91 on the grinding assembly 4. The suction dust removal component 6 includes a suction box 61 located below the grinding roller 42. The upper part of the suction box 61 is provided with a suction groove 62 corresponding to the grinding roller 42, and the lower part of the suction box 61 is provided with a fan 63. The suction port of the fan 63 corresponds to the suction groove 62, and the discharge port of the fan 63 is connected to the inlet of the dust collection bag 64. Through suction by the fan 63, the waste debris enters the suction box 61 from the suction groove 62, then enters the air inlet of the fan 63 from the lower part of the suction box 61, and is discharged from the air outlet of the fan 63 into the dust collection bag 64, where the waste debris is collected. In this embodiment, the fan 63 is a conventional fan device from the prior art, as long as it can achieve suction and exhaust, the specific model selection will not be elaborated here. In this embodiment, the dust collection bag 64 is a conventional dust collection bag product from the prior art, as long as it can achieve air collection and permeability, the specific model, product, and material selection will not be elaborated here. Example 4

[0046] Based on Example 1, Example 2, or Example 3, such as Figures 1-5 As shown, a dusting shaft 7 is also provided on one side of the abrasive roller 42, and a brush 8 is provided on the dusting shaft 7 to contact the outer surface of the abrasive roller 42. The axis of the dusting shaft 7 is parallel to the axis of rotation of the abrasive roller 42. The abrasive roller 42 is driven to rotate by the motor 9, and the dusting shaft 7 is fixedly mounted on the support frame 1. The brush 8 on the fixed dusting shaft 7 cleans the outer surface of the rotating abrasive roller 42, removing the waste material and debris attached to the outer surface of the abrasive roller 42, further improving the effectiveness of the abrasive roller 42 in abrading the sheet 91.

[0047] Working principle:

[0048] The present invention discloses an automatic sheet scraping device, which has good material guiding and scraping operability, and can perform scraping operations on the front or back of the sheet according to actual needs, and collect waste material.

[0049] One end of the sheet 91 is threaded between the upper material guide roller 21 and the lower material guide roller 31, guided according to actual use requirements, and then threaded through the guide chute 43 between the sanding roller 42 and the pressing roller 5. The sanding sheet 91 is limited and guided by the guide chute 43 on both sides of the guide chute 43, so as to prevent the sheet 91 from deviating from the sanding area during the sanding process. The sheet 91 is pressed against the outer surface of the sanding roller 42 by the pressing roller 5, and the sanding roller 42 rotates to sequentially sand the surface of the conveyed sheet 91.

[0050] When dust removal is required, the waste debris in the sanding process is collected by opening the fan 9. Reduce secondary pollution.

[0051] When the waste debris on the sanding roller 42 needs to be cleaned, the sanding roller 42 is driven to rotate by the motor 9, and the dusting shaft 7 is fixedly arranged on the support frame 1. The brush 8 on the fixedly arranged dusting shaft 7 is used to clean the outer surface of the rotating sanding roller 42, so as to further improve the effectiveness of the sanding operation of the sanding roller 42 on the sheet 91.

[0052] Further, whether the sanding sheet 91 is the front side or the back side, on the one hand, the upper material guide roller 21 and the lower material guide roller 31 are arranged to adjust the surface of the sheet 91 in contact with the material guide roller 21, or the sheet 91 is threaded through the guide chute 43 between the sanding roller 42 and the inner abutting pressing roller 5, or the sheet 91 is threaded through the guide chute 43 between the sanding roller 42 and the outer abutting pressing roller 5, so as to change the sanding surface of the sheet 91.

[0053] According to the ideal embodiment of the present application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the contents of the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. An automatic sheet scraping device, characterized in that, The utility model relates to a kind of sanding frame and sanding frame, including: Support frame (1), the sanding frame (4) is provided on the sanding frame (1) and the sheet (91) is pressed on the sanding frame (4) by pressing roller (5); The sanding frame (4) includes connecting on support frame (1) shaft (41), the sanding frame (4) is provided on the sanding frame (4) and the sanding frame (4) is provided with guide inclined plate (431) on both ends, oppositely arranged guide inclined plate (431) and the sanding frame (4) between form guide inclined groove (43), the outer periphery of the pressing roller (5) is at least partially active embedded in the guide inclined groove (43), the sheet (91) is active and is provided in the guide inclined groove (43), the sheet (91) two sides are respectively with the contact of sanding frame (42) and pressing roller (5).

2. An apparatus for automatically shaving a sheet material as defined in claim 1, wherein: Support frame (1) is provided with guide frame one (2) and guide frame two (3) that are arranged longitudinally, and the guide frame one (2) and the guide frame two (3) are located on the feed side of the sanding frame (4), the guide frame one (2) and the guide frame two (3) are respectively rotatably connected with upper layer guide roller (21) and lower layer guide roller (31) for guiding material, the sheet (91) is provided between the upper layer guide roller (21) and the lower layer guide roller (31), and rolls with the upper layer guide roller (21) and the lower layer guide roller (31).

3. An apparatus for automatically shaving a sheet material as defined in claim 2, wherein: The sanding frame (4) further includes motor (9) provided on support frame (1), the sanding frame (4) is fixedly provided on shaft (41), the shaft (41) is rotatably connected on support frame (1) by bearing seat and bearing, and one end of the shaft (41) is drivingly connected with the motor (9).

4. An apparatus for automatically shaving a sheet material as defined in claim 3, wherein: The lower of the sanding frame (4) is provided with suction dust removal assembly (6) corresponding to the sanding frame (4);The suction dust removal assembly (6) is used for sucking and collecting the waste debris generated by the sanding frame (4) on the sanding frame (4).

5. An apparatus for automatically shaving a sheet material as defined in claim 4, wherein: The suction dust removal assembly (6) includes suction box (61) provided below the sanding frame (4), the upper portion of the suction box (61) is provided with suction groove (62) corresponding to the sanding frame (4), the lower portion of the suction box (61) is provided with fan (63), the suction port of the fan (63) corresponds with the suction groove (62), and the discharge port of the fan (63) is connected with the inlet of dust collection bag (64).

6. An apparatus for automatically shaving a sheet material as defined in claim 5, wherein: One side of the sanding frame (4) is further provided with dusting shaft (7), and the dusting shaft (7) is provided with brush (8) in contact with the outer surface of the sanding frame (4).

7. An apparatus for automatically shaving a sheet material as defined in claim 6, wherein: The rotation axis of the sanding frame (4), the pressing roller (5), the upper layer guide roller (21) and the lower layer guide roller (31) is parallel to each other, and the guide track of the guide frame one (2) and the guide frame two (3) intersects with the rotation axis.

8. An apparatus for automatically shaving a sheet material as defined in claim 7, wherein: The setting axis of the dusting shaft (7) is parallel to the rotation axis of the sanding frame (4). And / or, the guide rail of the first guide frame (2) and the second guide frame (3) is perpendicular to the rotation axis or the setting axis.

9. An apparatus for automatically shaving a sheet material as defined in claim 8, wherein: When the sheet (91) is guided between the pressing rollers (5) on the feeding side of the sanding roller (42) from the sanding roller (42), the outer side of the sheet (91) is sanded, and the rotation direction of the motor (9) is the same as the conveying direction of the sheet (91). Or, when the sheet (91) is guided between the pressing rollers (5) on the discharging side of the sanding roller (42) from the sanding roller (42), the inner side of the sheet (91) is sanded, and the rotation direction of the motor (9) is opposite to the conveying direction of the sheet (91). Or, the frictional resistance of the sanding roller (42) to the sheet (91) is less than the driving force of the sheet (91).

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