JP7468053B2 - Cutting device - Google Patents

Description

The present invention relates to a cutting device that cuts cylindrical logs into toilet rolls.

The production of paper products requires a cutting process for cutting paper material.
When manufacturing toilet rolls (roll-shaped toilet paper), there is a cutting process in which a long roll-shaped log (paper tube) is cut to the product length. In the cutting process, the log is cut to the product length by a rotating knife blade attached to a cutting device (see Patent Document 1).

JP 2005-87788 A

In order to increase production efficiency, it is desirable to rotate the knife at high speed in the cutting device to cut the log in a short time. However, since the log to be cut has a certain diameter, the knife needs to penetrate deep into the log in order to cut it, and the side of the knife comes into sliding contact with the wide cut surface of the log.

For this reason, when the knife is rotated at high speed, the temperature of the knife blade rises and the tip of the blade wears rapidly, making it impossible to cut logs properly even in a short operating time. As a result, cutting devices equipped with cooling devices to cool the blade and sharpening devices to sharpen the tip of the blade have also been developed.

On the other hand, if foreign matter floating around the knife adheres to the edge or sides of the knife, it may scratch the cut surface of the log or cause foreign matter to adhere to the product, which may reduce the quality of the toilet roll. Foreign matter includes paper dust generated during cutting, but in the case of cutting devices equipped with abrasives, it also includes abrasive grains detached from the abrasive used for polishing.

This case was invented with a focus on these issues, and its primary objective is to improve the product quality of toilet rolls by removing foreign matter adhering to the cutting knife in a cutting device that cuts roll-shaped logs to the product length of toilet rolls. However, in addition to this objective, other objectives of this case include the effects and advantages derived from the various configurations shown in the "Mode for Carrying Out the Invention" described below, which cannot be obtained with conventional technology.

The cutting device in this case is a cutting device that cuts a cylindrical log into toilet rolls, and is characterized by having a cutting section that has a cutting edge on the outer periphery and a side surface where a portion of the radial area of the cut surface of the log is in contact with the cutting edge, cuts the log while rotating around the central axis of the side surface, and a brush with bristles attached to a support base that slide against the radial area of the side surface.

It is preferable that the cutting tool further includes a grinder for grinding the cutting edge of the cutting portion.
It is preferable that the cutting edge has a position adjustment mechanism that adjusts the position of the cutting part relative to the log so that the cutting edge, which retreats toward the central axis in response to wear of the cutting edge, takes a constant relative position with respect to the center line of the log being cut, and that the brush is fixed to a support member that takes a constant relative position with respect to the cutting edge in response to the retreat of the cutting edge.
The cutting edge has a position adjustment mechanism that adjusts the position of the cutting portion relative to the log so that the cutting edge, which retreats toward the central axis as the cutting edge wears, takes a constant relative position with respect to the center line of the log being cut, and the brush is fixed so that its position relative to the center line of the log is constant, and it is preferable that the cutting edge is in sliding contact with an area that is inner than the new area, including the new area, which is the radial area where the cut surface of the log contacts the side surface in a new cutting portion that has never been ground with the grinder, and that straddles the worn area, which is the radial area where the cut surface of the log contacts the side surface when the cutting edge is ground and worn with the grinder.
It is preferable that the brush further includes a support member that is disposed downstream of the cutting portion in the rotation direction of the brush and maintains an orientation in which the bristles planted on the support base of the brush face toward the side surface.
It is preferable that the brush further includes a pressing portion for urging the bristles toward the side surface via the support base of the brush.
It is preferable that the cutting section cuts the log transported along the central axis into pieces.
It is preferable that the cutting portion cuts the log while revolving around a rotation axis that is different from the central axis and that is aligned with the central axis.
It is preferable that the cutting blade further comprises a nozzle arranged on the outer periphery side of the cutting edge of the cutting portion opposite the central axis, the nozzle spraying air onto the cutting edge of the cutting portion to cool the cutting edge.
The bristles of the brush are preferably sparingly soluble.

According to this invention, when cutting a roll-shaped log to product length, foreign matter adhering to the cutting blade can be removed, thereby improving the product quality of the toilet roll.

FIG. 2 is a side view showing the cutting device according to the embodiment. 2 is a cross-sectional view (a cross-sectional view taken along the line AA in FIG. 1 ) showing a state in which a log is cut by the cutting device in FIG. 1 . 2 is a cross-sectional view showing a grinder installed in the cutting device of FIG. 1 (cross-sectional view taken along the line BB of FIG. 1 ). 4A is a cross-sectional view taken along the line CC in FIG. 1; FIG. 4B is a view taken along the line D in FIG. 4A; and FIG. 4C is a view taken along the line E in FIG. 4A. 1A to 1C are schematic perspective views showing a manufacturing process of a toilet roll according to an embodiment. FIG. 6 is a schematic perspective view showing a cutting step in the manufacturing process of FIG. 5 .

The cutting device will be described below as an embodiment. Note that the embodiment described below is merely an example, and is not intended to exclude various modifications or application of techniques not specified in the following embodiment. Each configuration of this embodiment can be modified in various ways without departing from the spirit of the embodiment. In addition, the configurations can be selected as necessary, or can be combined appropriately.
In the following description, first, a manufacturing process for a toilet roll (toilet paper roll) using a cutting device will be described, and then the cutting device will be described.

[1] Toilet Roll Manufacturing Process First, with reference to FIG. 5, a toilet roll manufacturing process using the cutting device according to this embodiment will be described.
5, the manufacturing process includes a log-forming process 10, a cutting process 20, a packaging process 30, and a boxing process 40. In each process, the following processing is performed.
FIG.

[1-1] Log Forming Process In the log forming process 10, the wide base paper 2 is fed from the jumbo roll 1 on which the wide base paper 2 is wound to a large diameter, and is wound up around a long core tube by a winder 11 to obtain a log 3, which is a wide roll of sanitary paper. This log 3 has the same diameter as the finished toilet roll 4, but is equal in length to the jumbo roll 1.

[1-2] Cutting Step In the cutting step 20, first, the log 3 is temporarily accumulated in an accumulator 21.
Next, a plurality of logs 3 (two in this example) are sequentially sent out so as to run side by side, and cut to the product length by a log saw 50 serving as a cutting device, to obtain the toilet roll 4. The number of logs to be sent side by side is not limited, and may be, for example, four.

6, the log saw 50 includes a straight rod-shaped support arm 23 rotatably supported about a rotation axis S1 whose middle portion is connected to the support body 22, and two blades 51 attached to both ends 23a of the support arm 23. While the support arm 23 rotates about the rotation axis S1 and the blade 51 rotates about its central axis CL1, that is, while the blade 51 revolves (orbits) about the rotation axis S1 and rotates about the central axis CL1, the log 3 is cut.
In this embodiment, two log saws 50 are provided, each 180 degrees out of phase with one another. However, the shape of the support arms 23 and the number of log saws 50 are not limited; for example, three support arms 23 may be extended radially from the rotation axis S1 and a log saw 50 may be attached to each end 23a, for a total of three log saws 50.

When cutting, the log 3 is transported along its axial direction and fed into the log saw 50, where the blade 51 of the log saw 50 is rotated while the support arm 23 rotates around the rotation axis S1 of the support body 22 to cut into the log 3 and perform the cut. When the cut is complete, the log 3 advances axially the product length, during which time the support arm 23 rotates 180 degrees and the other log saw 50 is used to cut into the log 3 and perform the cut. This is repeated to complete the cutting of each log 3.

[1-3] Packaging step As shown in FIG. 5, in the packaging step 30, the toilet rolls 4 obtained by cutting using a log saw 50 are inserted into a packaging bag 5 in sets of, for example, 8 to 24 pieces (4 to 12 pieces x 2 rows), and the opening is sealed to form a package 6.

[1-4] Packing Process In the packing process 40, a set of the packages 6 is packed into a cardboard box 7 to form a boxed body 8 for shipment.

[2] Cutting device (log saw)
As shown in FIG. 1, the log saw 50, which serves as a cutting device for cutting the cylindrical log 3 into toilet rolls 4, comprises a disk-shaped knife blade 51 (cutting portion, hereinafter simply referred to as the blade 51), a grinder 60 for grinding the cutting edge 51a on the outer periphery of the blade 51, a brush 70 in sliding contact with the side of the blade 51, a support member 80 for maintaining the position of the brush 70, and an air nozzle 90 for spraying cooling air onto the cutting edge 51a of the blade 51.

[2-1] Blade A first support member 52 is fixed to the end 23a of the support arm 23 by a fastening member or the like so as to protrude further outward from the end 23a. The blade 51 is attached to the tip of the first support member 52 and is rotated at high speed by a motor (not shown). As shown in Fig. 2, the blade 51 is positioned so that each side surface (blade surface) 51b of the blade 51 is oriented perpendicular to the center line CL2 of the log 3 being transported.

When cutting the log 3, the blade 51 moves the blade 51, which is rotated as shown by the arrow A2, from one side of the log 3 (e.g., the right side in FIG. 1) to the other side (e.g., the left side in FIG. 1) while the support arm 23 is rotated as shown by the arrow A1 in FIG. 1 by a rotation mechanism not shown.

[2-2] Grinder A second support member 53 is further attached to the end 23a of the support arm 23, and a bracket (support member) 54 is attached to the second support member 53.
1 and 3, the grinder 60 includes a first rotary grindstone 61 for grinding one side (the front side in FIG. 1) of the cutting edge 51a of the blade 51, and a second rotary grindstone 62 for grinding the other side (the rear side in FIG. 1) of the cutting edge 51a of the blade 51, and both rotary grindstones 61, 62 are supported by a stay 63 movably attached to the bracket 54. The rotary grindstones 61, 62 come into contact with the cutting edge 51a of the blade 51 as the stay 63 moves, and grind the cutting edge 51a while rotating.

Each stay 63 is moved by an actuator (not shown) between a state in which the grindstones 61, 62 are in contact with the cutting edge 51a of the blade 51 and a state in which the grindstones 61, 62 are separated from the cutting edge 51a of the blade 51, for example as shown by the white arrow A5 in FIG. 3. In this embodiment, when a preset time has elapsed since the previous sharpening was completed, each stay 63 moves the grindstones 61, 62 so that they come into contact with the cutting edge 51a of the blade 51 for a predetermined time to sharpen the cutting edge 51a, and then moves the grindstones 61, 62 away from the cutting edge 51a.

The cutting edge 51a of the blade 51 wears and becomes dull as the log 3 is cut, but as described above, the grinder 60 operates at a predetermined timing to grind the cutting edge 51a of the blade 51, preventing the cutting edge 51a from becoming dull and maintaining good sharpness. This makes it possible to smooth the cut surface formed by cutting the log 3, ensuring good product quality of the toilet roll 4.

[2-3] Brush The brush 70 is disposed adjacent to the grinder 60 on the downstream side in the rotation direction of the blade 51, as shown in Fig. 1. The brush 70 includes a first brush 71 for cleaning the blade surface 51b on one side (front side) including the cutting edge 51a of the blade 51, and a second brush 72 for cleaning the blade surface 51b on the other side (rear side) including the cutting edge 51a of the blade 51, as shown in Fig. 4. The first brush 71 is fixed directly to the bracket 54, and the second brush 72 is fixed to an auxiliary bracket (support member) 55 fixed to the bracket 54 by bolting or the like.

Each brush 71, 72 is provided with a base member 73, 74 fixed to a bracket 54, 55, a brush body 75 supported by the base member 73, 74, and a pressing mechanism (pressing part) 76 interposed between the base member 73, 74 and the brush body 75 to press the brush body 75 from the back surface against the blade surface 51b, and is disposed opposite each other with the blade 51 in between.

The base members 73, 74 are both rod-shaped members, with one end fixed to the brackets 54, 55 by bolting or the like, and with brush support parts 73a, 74a extending from the center to the other end to support the brush body 75. The brush support parts 73a, 74a are provided with insertion holes 73b, 74b spaced apart in the longitudinal direction, through which the mounting shaft 75c of the brush body 75 is inserted.

The brush body 75 is constructed by planting a large number of brush bristles (also simply called "bristles") 75b on one surface (front surface) of a base plate (support base) 75a, and two mounting shafts 75c protrude from the other surface (back surface) of the base plate 75a. A female thread 75d is formed on the outer periphery of the protruding end of each mounting shaft 75c. The mounting shafts 75c are inserted into the insertion holes 73b, 74b, and a nut (here, a double nut) 77 is screwed onto the female thread 75d at the end protruding from the insertion holes 73b, 74b, and the mounting shafts 75c are engaged with the base members 73, 74.

The pressing mechanism 76 includes a spring member 76a using a coil spring, which is disposed on the outer periphery of the mounting shaft 75c and is interposed between the other surface (back surface) of the base plate 75a and the front surfaces of the base members 73 and 74, which face each other. When the base members 73 and 74 to which the brush body 75 is attached are fixed to the brackets 54 and 55, the spring member 76a is compressed and presses the back surface of the base plate 75a, urging the brush bristles 75b toward the blade surface 51b. This causes the tips of the brush bristles 75b to be pressed against the blade surface 51b.
The brush bristles 75b are preferably made of a material that is difficult to melt due to frictional heat, and animal bristles are used in this embodiment.

The brush bristles 75b extend radially of the blade 51 and are in sliding contact with the blade surface 51b so that they can clean a specific area of the blade surface 51b including the cutting edge 51a. This specific area is the radial area of the blade surface 51b where the cut surface of the log 3 (shown by the two-dot chain circle C1 in FIG. 1) slides against the blade surface 51b when the log 3 is cut by the blade 51, and is the radial area RA outside the two-dot chain circle C2 in FIG. 1.

In this way, by pressing the tips of the brush bristles 75b of the brush body 75 of the brushes 71 and 72 against a predetermined area (radial area RA) of the blade surface 51b including the cutting edge 51a, foreign matter adhering to the predetermined area of the side surface 51b of the blade 51 is removed, and adhesion of foreign matter to the cut surface of the log 3 is suppressed.

In particular, when grinding the cutting edge 51a of the blade 51 with the grinder 60, abrasive grains detached from the abrasive (abrasive material) of the rotating grindstones 61, 62 and grinding powder from the cutting edge are generated, and these foreign matter adhere to the blade surface 51b. However, since the brush 70 is positioned adjacent to the grinder 60 on the downstream side of the rotation direction of the blade 51, these foreign matter can be removed before they reach the cutting surface of the log 3.

[2-4] Support member In addition, the brush body 75 is subjected to a force in the rotational direction through the brush bristles 75b that are in sliding contact with the blade surface 51b due to the rotation of the blade 51. Therefore, a support member 80 is abutted against one side of the brush body 75 (the downstream side in the rotational direction of the blade 51) so that the brush body 75 faces the force that the blade 51 receives from the blade 51 due to the rotation of the blade 51, and the brush body 75 is prevented from falling due to the force in the rotational direction that the blade 51 receives from the blade 51, and the brush bristles 75b are in sliding contact with the blade surface 51b while maintaining a position that properly faces the blade surface 51b.

The support members 80 are elongated plate-like members, and two of them are provided on each of the brush support parts 73a, 74a of the base members 73, 74, spaced apart in the longitudinal direction of the brush body 75. The base end of each support member 80 is fixed to one side of the brush support parts 73a, 74a (the surface downstream in the rotation direction of the blade 51), and the tip end is abutted against one side of the base plate 75a of the brush body 75 (the surface downstream in the rotation direction of the blade 51).

[2-5] Air Nozzle As shown in Figures 1 and 4, the air nozzles 90 are fixed to the auxiliary bracket 55, and three are provided toward the cutting edge 51a of the blade 51 from the tip direction and both diagonal directions to the left and right. Each air nozzle 90 injects room temperature or cooled compressed air supplied from a compressor (not shown) near the cutting edge 51a to cool it. This prevents the cutting edge 51a and its surroundings from rising in temperature due to frictional heat caused by the high speed rotation of the blade 51.

[2-6] Position Adjustment Mechanism The cutting edge 51a of the blade 51 wears down as it is ground by the grinder 60, and gradually retreats towards the center of rotation. Therefore, a position adjustment mechanism (not shown) is provided that can adjust the position of the first support member 52 relative to the support arm 23, for example, as shown by the outlined arrow A3 in Fig. 1. When the cutting edge 51a retreats towards the center of rotation due to wear, the first support member 52 is moved so as to protrude towards the center of rotation of the blade 51 relative to the support arm 23, so that the cutting edge 51a is positioned appropriately with respect to the log 3 during cutting.

In addition, as the cutting edge 51a recedes toward the center of rotation due to wear, the grindstones 61 and 62 of the grinder 60 also change their relative positions to the cutting edge 51a. Therefore, for example, as shown by the white arrow A4 in FIG. 1, a position adjustment mechanism (not shown) is provided that can adjust the position of the bracket 54 relative to the second support member 53, so that the bracket 54 takes a constant relative position to the cutting edge 51a. When the cutting edge 51a recedes toward the center of rotation due to wear, the bracket 54 is moved so as to protrude toward the center of rotation of the blade 51 relative to the second support member 53, so that the grindstones 61 and 62 of the grinder 60 take the appropriate relative position to the cutting edge 51a.

The brush 70, support member 80, and air nozzle 90 attached to the bracket 54 also move together with the grinder 60, and are adapted to maintain the correct position relative to the blade 51. For example, even if the cutting edge 51a of the brush 70 wears, the tips of the brush bristles 75b of the brush body 75 of each brush 71, 72 press against a specified area (radial area RA) of the blade surface 51b including the cutting edge 51a, preventing foreign matter from adhering to the cut surface of the log 3. Even if the cutting edge 51a wears, the air nozzle 90 maintains the correct position relative to the cutting edge 51a and sprays air near the cutting edge 51a to cool it.

[3] Function and Effect Since the cutting device (log saw) 60 of the present invention is configured as described above, it is possible to increase the cutting speed of the log 3 to increase productivity while ensuring good product quality of the toilet roll 4.

In other words, to increase the cutting speed of the log 3, it is necessary to increase the rotation speed of the support arm 23 and increase the cutting speed into the log 3. However, since the grinder 60 is operated at a predetermined timing to grind the cutting edge 51a of the blade 51 while cutting the log 3, the cutting edge 51a of the blade 51 is always kept sharp, making it easier to increase the cutting speed into the log 3.

In addition, the tips of the brush bristles 75b of the brush body 75 of each brush 71, 72 of the brush 70 are pressed against a predetermined area (radial area RA) of the blade surface 51b including the cutting edge 51a, removing any foreign matter adhering to this area. This prevents foreign matter from adhering to the cut surface of the log 3, prevents the cut surface of the log 3 from becoming dirty or damaged, and ensures good product quality for the toilet roll 4.

In particular, when grinding the cutting edge 51a of the blade 51 with the grinder 60, abrasive grains detached from the abrasive (abrasive material) of the rotating grindstones 61, 62 and grinding powder from the cutting edge are generated, but the brush 70 removes such foreign matter, preventing the adhesion of foreign matter generated by grinding the cutting edge 51a to the cut surface of the log 3, helping to ensure the product quality of the toilet roll 4.

In addition, the brush body 75 receives a force in the rotational direction from the blade 51 as the blade 51 rotates. However, since the brush body 75 is supported by the support member 80 that contacts the blade 51 from the downstream side in the rotational direction, the brush body 75 is prevented from falling over due to the force in the rotational direction, and the brush bristles 75b properly slide against the blade surface 51b. This reliably prevents foreign matter from adhering to the cut surface of the log 3.

In addition, the air nozzle 90 sprays compressed air near the cutting edge 51a of the blade 51 to cool it, which prevents the cutting edge 51a and its surroundings from increasing in temperature due to frictional heat caused by the high speed rotation of the blade 51. This prevents the cutting edge 51a and its surroundings from losing rigidity due to temperature rise, and prevents the cutting edge 51a from losing sharpness due to deformation of the cutting edge 51a, making the cut surface of the log 3 smooth and contributing to ensuring the product quality of the toilet roll 4.

In addition, the position of the bracket 54 is adjusted according to wear on the cutting edge 51a of the blade 51, so even if the cutting edge 51a wears, the grinding wheels 61, 62 of the grinder 60 can be positioned appropriately relative to the cutting edge 51a, allowing the cutting edge 51a to be properly ground.

Similarly, the brush 70 and the air nozzle 90 can also be positioned appropriately relative to the blade surface 51b and the cutting edge 51a even if the cutting edge 51a is worn.
As a result, even if the cutting edge 51a becomes worn, the tips of the brush bristles 75b of the brush body 75 of each brush 71, 72 of the brush 70 are pressed against a predetermined area (radial area RA) of the blade surface 51b including the cutting edge 51a, reliably preventing foreign matter from adhering to the cut surface of the log 3, and the air nozzle 90 injects compressed air near the cutting edge 51a to appropriately cool the area near the cutting edge 51a.

In addition, the brush bristles 75b are made of a highly refractory material (in this embodiment, animal hair) that is difficult to melt due to frictional heat, so the brush bristles 75b can be prevented from melting due to frictional heat, improving the durability of the brush body 75.

[4] Others Although the embodiment according to the present invention has been described above, the configuration of the cutting device is not limited to the above embodiment, and various modifications can be made.

For example, in the above embodiment, a position adjustment mechanism is provided so that the bracket (support member) 54 to which the brush 70 etc. is fixed takes a constant relative position with respect to the cutting edge 51a in response to retraction due to wear of the cutting edge 51a. However, if the brush 70 is fixed so that its position relative to the center line CL of the log 3 to be cut is constant, it is preferable to configure the brush 70 as follows, taking into account the retraction due to wear of the cutting edge 51a of the blade 51.

In other words, the sliding contact area of the brush bristles 75b of each brush 71, 72 against the blade surface 51b is set to include a radial area (new area) where the cut surface of the log 3 of the blade 51 contacts the blade surface 51b when the cutting edge 51a of the blade 51 is in a new state where it has never been ground by the grinder 60, and also includes an area that is on the inner side of this new area and straddles the worn area, which is the radial area where the cut surface of the log 3 contacts the blade surface 51b when the cutting edge 51a is ground and worn by the grinder 60.

As a result, even if the cutting edge 51a of the blade 51 becomes worn due to grinding by the grinder 60, the brush bristles 75b can be brought into sliding contact with the area of the blade 51 where the cut surface of the log 3 comes into contact, without moving the brush 70, thereby preventing foreign matter from adhering to the cut surface of the log 3.
In addition, in the above embodiment, a grinder 60 is provided for grinding the cutting edge 51a of the blade 51, and the brush 70 is suitable for removing foreign matter generated during grinding. However, even if the grinder 60 is not provided, there is a risk of foreign matter adhering to the blade 51, and the brush 70 is also effective in removing such foreign matter.

1. Jumbo roll 2. Wide paper 3. Log 4. Toilet roll (toilet paper)
5 Packaging bag 6 Packaging body 7 Cardboard box 8 Boxed body 10 Log forming process 11 Winder 20 Cutting process 21 Accumulator 22 Support 23 Support arm 23a End of support arm 23 30 Packaging process 40 Boxing process 50 Log saw as cutting device 51 Blade (cutting portion, knife blade)
51a: cutting edge of the blade 51 51b: side surface (blade surface) of the blade 51
52 First support member 53 Second support member 54 Bracket (support member)
55 Auxiliary bracket (support member)
60 Grinder 61 First rotary grindstone 62 Second rotary grindstone 63 Stay 70 Brush 71 First brush 72 Second brush 73, 74 Base member 73a, 74a Brush support portion 73b, 74b Insertion hole 75 Brush body 75a Base plate (support base)
75b Brush hair (hair)
75c Mounting shaft 75d Female thread portion 76 Pressing mechanism (pressing portion)
76a Spring member 77 Nut (double nut)
80 Support member 90 Air nozzle C1 Circle showing the cut surface of the log 3 C2 Circle showing the radial area where the cut surface of the log 3 slides CL1 Center axis of the blade 51 CL2 Center line of the log 3 RA Radial area S1 Rotation axis of the support arm 23

Claims (10)

A cutting device for cutting a cylindrical log into toilet rolls, comprising:
a cutting section having a cutting edge on an outer circumferential edge and a side surface having a radial region in contact with a cut surface of the log formed by the cutting edge, the cutting section rotating around a central axis of the side surface to cut the log;
a brush having bristles attached to a support base and in sliding contact with the radial region of the side surface;
and a grinder for grinding the cutting edge of the cutting portion.
The brush is disposed adjacent to the grinder on a downstream side in a rotation direction of the cutting portion ,
The grinder is operated at a predetermined timing to cut the log while sharpening the cutting edge.
A cutting device characterized in that A position adjustment mechanism is provided for adjusting the position of the cutting portion relative to the log so that the cutting edge, which recedes toward the central axis in response to wear of the cutting edge, is positioned at a constant relative position with respect to the center line of the log to be cut;
2. The cutting device of claim 1, wherein the brush is fixed to a support member that assumes a constant relative position with respect to the cutting edge as the cutting edge retracts. A position adjustment mechanism is provided for adjusting the position of the cutting portion relative to the log so that the cutting edge, which recedes toward the central axis in response to wear of the cutting edge, is positioned at a constant relative position with respect to the center line of the log to be cut;
the brush is fixed in position relative to the centerline of the log;
The cutting device described in claim 1, characterized in that the brush is in a region that is inner than a new region, which is the radial region where the cut surface of the log contacts the side surface in a new cutting portion where the cutting edge has never been ground by the grinder, and that straddles a worn region, which is the radial region where the cut surface of the log contacts the side surface when the cutting edge is ground and worn by the grinder. The cutting device according to any one of claims 1 to 3, further comprising a support member arranged downstream of the brush in the direction of rotation of the cutting section, the support member maintaining an orientation in which the bristles planted on the support base of the brush face toward the side. 5. The cutting device according to claim 1, further comprising a pressing portion for urging the bristles toward the side surface via the support base of the brush. 6. The cutting device according to claim 1, wherein the cutting section cuts the log transported along the central axis into pieces. 7. The cutting device according to claim 1, wherein the cutting portion cuts the log while revolving around a rotation axis that is different from the central axis and that is aligned with the central axis. The cutting device according to any one of claims 1 to 7, further comprising a nozzle arranged on the outer periphery of the cutting edge of the cutting portion opposite the central axis, for injecting air onto the cutting edge of the cutting portion to cool the cutting edge. 9. The cutting device according to claim 1, wherein the bristles of the brush are hardly soluble. A method for manufacturing a toilet roll, comprising a cutting step of cutting a cylindrical log into toilet rolls,
A method for manufacturing a toilet roll, wherein in the cutting step, the log is cut into pieces using a cutting device according to any one of claims 1 to 9.

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