JP2024056457A - Rotary blade holder - Google Patents

Abstract

[Problem] We propose a technology that allows for easy replacement of a rotary blade. [Solution] A rotary blade holder that holds a rotary blade used in a slitter device. The insertion portion of a first member is configured to be insertable into a through hole provided in the center of the rotary blade. The second member has an annular shape into which the insertion portion can be inserted, and is configured to be rotatable around the insertion portion. The abutment portion abuts against the second member when the second member is in a predetermined rotation position, thereby preventing the second member from being removed from the insertion portion. The rotation limiting portion does not limit rotation around the insertion portion when the second member is in a first insertion position that is relatively close to the main body, and limits rotation when the second member is in a second insertion position that is relatively farther from the main body than the first insertion position. The biasing portion biases the second member from the first insertion position toward the second insertion position. [Selected Figure] Figure 1

Description

This disclosure relates to a rotary blade holder that holds a disk-shaped rotary blade used in a slitter device.

There is a known slitter device that cuts rolled foil or paper to a fixed width while winding it up. In addition, a configuration in which a rotary blade holder that holds a rotary blade is held by a rotating shaft is known for a slitter device. In this configuration, when replacing the rotary blade due to wear or the like, it is necessary to remove the rotary blade from the rotary blade holder. Patent Document 1 discloses a device in which a protrusion provided on the holder is pressed to enable rotation of a retaining ring relative to the holder, thereby enabling the retaining ring to be removed and the rotary blade to be replaced.

JP 2014-131822 A

In the configuration of Patent Document 1, when removing the retaining ring from the holder to replace the rotary blade, it is necessary to simultaneously press the protrusion and rotate the retaining ring. In other words, it is necessary to simultaneously operate two parts with different operating directions. This can make it difficult to replace the rotary blade.

The purpose of this disclosure is to propose a technology that allows for easy replacement of the rotary blade.

One aspect of the present disclosure is a rotary blade holder that holds a rotary blade used in a slitter device. This rotary blade holder includes a first member, a second member, an abutment portion, a rotation limiting portion, and an urging portion. The first member includes an insertion portion and a main body portion. The insertion portion is configured to be insertable into a through hole provided in the center of the rotary blade. The main body portion is disposed at one end of the insertion portion in the longitudinal direction and prevents the rotary blade from falling off from the one end side. The second member has an annular shape configured to allow the insertion portion to be inserted therein, is configured to be rotatable around the insertion portion, and prevents the rotary blade from falling off from the insertion portion when the insertion portion is inserted. The abutment portion is provided on the first member. In addition, the abutment portion abuts against the second member when the second member is in a predetermined rotation position to prevent the second member from being removed from the insertion portion. The rotation limiting portion is provided on at least one of the first member and the second member. The rotation limiting portion does not limit rotation about the insertion portion when the second member is in the first insertion position, which is relatively close to the main body portion, and limits rotation when the second member is in the second insertion position, which is relatively farther from the main body portion than the first insertion position. The biasing portion biases the second member from the first insertion position toward the second insertion position.

In the rotary blade holder configured in this manner, the second member can be attached to the first member by pressing the second member to move it to the first insertion position, then rotating the second member to move it to a predetermined rotation position, and then releasing the pressure on the second member to set it to the second insertion position. In addition, when removing the second member from the first member, the operation is reversed from the above, and the second member is moved to the first insertion position, then rotated to a position different from the predetermined rotation position, and the pressure is released to make it removable.

In other words, in the rotary blade holder described above, the second member can be attached to and detached from the first member by operating the second member, making it easy to attach and detach the second member. As a result, in the rotary blade holder described above, the rotary blade can be easily replaced.

In the rotary blade holder described above, the rotation limiting portion may be configured to limit the rotation of the second member described above when the second member is in a predetermined rotational position. With this configuration, the rotation of the second member can be limited when the second member is in a rotational position that prevents the second member from being removed from the first member, thereby preventing the second member from unexpectedly coming off the first member.

In the rotary blade holder described above, the biasing part may be configured to bias the rotary blade into which the insertion part is fitted, thereby biasing the second member via the rotary blade. With this configuration, the rotary blade can be sandwiched between the second member and the biasing part, and the rotary blade can be firmly fixed.

In the rotary blade holder described above, the rotation limiting portion may include a first locking portion provided on the first member and a second locking portion provided on the second member. The second locking portion may be configured not to engage with the first locking portion when the second member is in the first insertion position, and to engage with the first locking portion when the second member is in the second insertion position, thereby limiting the rotation of the second member described above.

With this configuration, when the second member is in the second insertion position, the second member can be easily rotated without being restricted by the rotation restricting portion. This makes it easy to attach and detach the second member to the first member.

In the rotary blade holder described above, the first locking portion may be a protruding piece that protrudes from the insertion portion. The second locking portion may be a notch that is configured to engage with the first locking portion when the second member is in a predetermined rotational position. With this configuration, the first locking portion and the second locking portion can be appropriately engaged, and rotation of the second member can be effectively suppressed.

FIG. 1A is an oblique view showing an embodiment of a rotary blade holder holding a rotary blade, FIG. 1B is an oblique view of the rotary blade holder from a different perspective than FIG. 1A, FIG. 1C is a front view of the rotary blade holder, FIG. 1D is a right side view of the rotary blade holder, and FIG. 1E is a bottom view of the rotary blade holder. FIG. 2 is an exploded perspective view of the rotary blade holder according to the embodiment. FIG. 3A is a front view of the first member, and FIG. 3B is a right side view of the first member. FIG. 5A is a cross-sectional view taken along line VA-VA in FIG. 1C, FIG. 5B is a cross-sectional view showing the second member pressed toward the main body portion, and FIG. 5C is a cross-sectional view showing the second member rotated to a second rotation position. FIG. 6A is a front view of the rotary blade holder in which a second member is indicated by a dashed line, and FIG. 6B is a front view of the second member rotated and indicated by a dashed line.

Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings.
1. Embodiment
[1-1. Configuration of the rotary blade holder]
The rotary blade holder 1 shown in Figures 1A to 1E and 2 is a device that holds a rotary blade 17 used in a slitter device (not shown). Figures 1A to 1E show a state in which the rotary blade holder 1 holds the rotary blade 17. As shown in Figure 2, the rotary blade 17 has a disk shape with a through hole formed in the center. The outer peripheral end of the rotary blade 17 functions as a blade.

The rotary blade holder 1 comprises a substantially cylindrical first member 11, and a second member 13 and a biasing portion 15, all of which are annular and disk-shaped. The rotary blade holder 1 is assembled by fitting the second member 13, the biasing portion 15, and the rotary blade 17 onto the outer periphery of the first member 11. When assembled, the rotary blade holder 1 holds the rotary blade 17 so that it cannot fall off.

As shown in Fig. 2 and Figs. 3A and 3B, the first member 11 includes an insertion portion 21 and a main body portion 23. The insertion portion 21 and the main body portion 23 are cylindrical members with a through hole provided coaxially, and are constructed as one unit. A rotating shaft (not shown) of a slitter device can be inserted into the through hole of the first member 11, and the first member 11 is held by the rotating shaft.

In the following description, the end of the insertion portion 21 on the side of the main body portion 23 is described as one end of the insertion portion 21, and the end opposite the main body portion 23 is described as the other end of the insertion portion 21. In addition, the axis of the through hole of the first member 11 shown in Figures 3A and 3B is the central axis A.

As shown in FIG. 3B, the insertion portion 21 has a first support portion 21a and a second support portion 21b. The first support portion 21a is disposed at one end of the insertion portion 21 and adjacent to the main body portion 23, and has a relatively large outer diameter. The second support portion 21b is disposed at the other end side of the insertion portion 21 than the first support portion 21a, and has a relatively small outer diameter. The insertion portion 21 can be inserted into a through hole provided in the center of the rotary blade 17, and the rotary blade 17 is fitted onto the first support portion 21a.

Three abutment parts 25 are provided on the other end of the insertion part 21. The abutment parts 25 are provided at three locations in the circumferential direction, spaced apart from one another. The abutment parts 25 protrude in a direction away from the central axis A beyond the outer peripheral side surface of the second support part 21b of the insertion part 21. In the following description, the direction away from the central axis A described above is referred to as the outward direction.

In addition, three first locking portions 27 are provided at the above-mentioned other end of the insertion portion 21 where the abutment portion 25 is not provided. The first locking portions 27 are protruding pieces that protrude outward from the insertion portion 21. The first locking portions 27 have a threaded portion 27a, and are fixed to the main body portion 23 by screwing the threaded portion 27a into a screw hole formed in the main body portion 23.

The main body 23 is disposed at one end of the insertion portion 21. The outer diameter of the main body 23 is larger than the first support portion 21a, and is larger than the diameter of the through holes of the second member 13, the biasing portion 15, and the rotary blade 17. Therefore, when the second member 13, the biasing portion 15, and the rotary blade 17 are inserted into the insertion portion 21, they are prevented from falling off from the one end side of the insertion portion 21.

As shown in FIG. 4, the second member 13 has an annular shape configured so that the insertion portion 21 can be inserted, and is configured so that it can rotate around the insertion portion 21 when the insertion portion 21 is inserted. As shown in FIG. 1D, when the insertion portion 21 is inserted, the second member 13 prevents the rotary blade 17 fitted into the insertion portion 21 from falling off from the other end of the insertion portion 21. The second member 13 also holds the rotary blade 17 by sandwiching the rotary blade 17 between the biasing portion 15 supported by the main body portion 23.

As shown in FIG. 4, the inner periphery of the second member 13 is provided with a first inner periphery 31 that extends relatively inward, and a second inner periphery 33 that does not extend inward compared to the first inner periphery 31 and is located on the outer periphery side. A notch 35 is formed between adjacent first inner peripheries 31, and a second locking portion 37 that is a notch 35 is formed between adjacent second inner peripheries 33. A combination including adjacent first inner peripheries 31 and the notch 35 therebetween, and a combination including adjacent second inner peripheries 33 and the second locking portion 37 therebetween are alternately arranged in three sets on the inner periphery of the second member 13. The notch 35 and the second locking portion 37 are shaped so that the outer end of the first locking portion 27 can enter into them.

The biasing portion 15 is a so-called disc spring, and is fitted onto the first support portion 21a as shown in FIG. 5A etc. The biasing portion 15 biases the rotary blade 17 in a direction away from the main body portion 23 (i.e., a direction from one end of the insertion portion 21 toward the other end). In the following description, the direction from the main body portion 23 toward the insertion portion 21 is referred to as the detachment direction, and the direction from the insertion portion 21 toward the main body portion 23 is referred to as the insertion direction. As a result of the biasing portion 15 biasing the rotary blade 17 as described above, the biasing portion 15 biases the second member 13 in the detachment direction via the rotary blade 17.

[1-2. Operation and Function of Rotary Blade Holder]
5A, the first support portion 21a accommodates the urging portion 15 and the rotary blade 17 in this order from the leading end in the insertion direction (i.e., one end side of the insertion portion 21). In a state in which the second member 13 is not attached, the urging portion 15 and the rotary blade 17 can be freely attached and detached to the first member 11. Note that the urging portion 15 may be fixed to the first member 11 so as not to be detachable.

The second member 13 is attached to the first member 11 as follows.
6A , the second member 13 with the insertion portion 21 inserted therein is disposed so that the three first locking portions 27 are fitted between the three notches 35. This position of the second member 13 is referred to as the first rotation position. The rotation position here refers to the position obtained as a result of the second member 13 being rotated and displaced around the insertion portion 21, and the position of the rotation axis of the second member 13 does not change even if the rotation position changes.

When the second member 13 is in the first rotation position, by pressing the second member 13 in the insertion direction, the second member 13 moves to a position deeper on the main body 23 side than the abutment portion 25 and the first locking portion 27, as shown in FIG. 5B. The above-mentioned position of the second member 13 in the insertion direction is defined as the first insertion position.

When in the first insertion position, the second member 13 can freely rotate around the insertion portion 21 without being affected by the abutment portion 25 or the first locking portion 27 .
After the second member 13 is set to the first insertion position, the second member 13 is then rotated to a position where the three first locking portions 27 are fitted into the second locking portions 37, as shown in Fig. 6B. This position is referred to as the second rotation position. This second rotation position corresponds to the predetermined rotation position.

When the second member 13 is in the second rotation position, if pressure in the insertion direction against the second member 13 is stopped, the second member 13 is biased by the biasing portion 15 and moves in the removal direction. Then, as shown in FIG. 5C, the first locking portion 27 enters the interior of the second locking portion 37, and the first inner periphery 31 and the abutment portion 25 abut against each other. The above-mentioned position of the second member 13 in the insertion direction is the second insertion position.

As shown in FIG. 5C, when the second member 13 is in the second rotation position and the second insertion position, the rotation of the second member 13 is restricted by the engagement between the second locking portion 37 and the first locking portion 27, and the engaged state is maintained by the biasing portion 15. Therefore, the state in which the first inner periphery portion 31 and the abutment portion 25 are appropriately maintained in abutment, thereby preventing the second member 13 from falling off. The first locking portion 27 and the second locking portion 37 correspond to the rotation restricting portion.

As described above, in the process of attaching the second member 13, when the second member 13 is in the first rotation position (Fig. 6A) and pressed in the insertion direction to move it to the first insertion position (Fig. 5B), it becomes possible for the second member 13 to rotate about the insertion portion 21. When the second member 13 is in the second rotation position (Fig. 6B) and the pressure is released, the biasing force of the biasing portion 15 moves the second member 13 in the detachment direction to the second insertion position (Fig. 5C). As a result, the second member 13 is prevented from falling off.

When removing the second member 13 from the first member 11, the second member 13 is pressed to the first insertion position, and then rotated to the first rotation position, so that the second member 13 can be removed without abutting against the abutment portion 25.

[1-3. Effects]
According to the embodiment described above in detail, the following effects can be obtained.
(1a) In the rotary blade holder 1, the abutment portion 25 provided on the first member 11 restricts the movement of the second member 13 in the detachment direction when the second member 13 is in the second rotation position. The first locking portion 27 and the second locking portion 37 constituting the rotation restricting portion do not restrict the rotation about the insertion portion 21 when the second member 13 is in the first insertion position relatively close to the main body portion 23, but restrict the above-mentioned rotation when the second member 13 is in the second insertion position. The biasing portion 15 biases the second member 13 from the first insertion position toward the second insertion position.

Because of this configuration, when attaching the second member 13 to the first member 11, the second member 13 can be attached to the first member 11 by pressing the second member 13 in the insertion direction and then rotating it. Also, when removing the second member 13 from the first member 11, the second member 13 can be made removable by pressing the second member 13 in the insertion direction and then rotating it. Therefore, the second member 13 can be attached to and detached from the first member 11 by a simple operation that handles only the second member 13. This makes it easy to replace the rotary blade 17.

(1b) In the rotary blade holder 1, the first locking portion 27 and the second locking portion 37 constituting the rotation limiting portion are configured to limit the rotation of the second member 13 when the second member 13 is in the second rotation position, i.e., when the second member 13 is in a position where the first inner circumference portion 31 and the abutment portion 25 interfere with each other to prevent the second member 13 from falling off. This makes it possible to prevent the second member 13 from unexpectedly coming off the first member 11.

(1c) In the rotary blade holder 1, the biasing portion 15 is configured to bias the rotary blade 17 inserted into the insertion portion 21, and bias the second member 13 in the detachment direction via the rotary blade 17. Therefore, the rotary blade 17 can be appropriately sandwiched between the second member 13 and the biasing portion 15, and the rotary blade 17 can be firmly fixed.

(1d) In the rotary blade holder 1, the second locking portion 37 is configured not to engage with the first locking portion 27 when the second member 13 is in the first insertion position, and to engage with the first locking portion 27 when the second member 13 is in the second insertion position, thereby restricting rotation around the insertion portion 21.

Because of the above configuration, when the rotary blade holder 1 is in the second insertion position, the second member 13 can be easily rotated. This makes it easy to attach and detach the second member 13.

(1e) In the rotary blade holder 1, the first locking portion 27 is a protruding piece that protrudes from the insertion portion 21, and the second locking portion 37 is a notch 35 that is configured to engage with the first locking portion 27 when the second member 13 is in the second rotation position. Therefore, the first locking portion 27 and the second locking portion 37 can be appropriately engaged, and the rotation of the second member 13 can be effectively suppressed.

(1f) In the rotary blade holder 1, the first locking portion 27 fits inside the notch 35 when viewed from the front when in the first rotation position. Therefore, the user can easily align the second member 13 to the first rotation position by rotating the second member 13 so that the notch 35 fits into the first locking portion 27.

2. Other embodiments
Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure is in no way limited to the above-described embodiments, and can take various forms as long as they fall within the technical scope of the present disclosure.

(2a) In the above embodiment, the first locking portion 27 and the second locking portion 37 that constitute the rotation limiting portion engage with each other to suppress the rotation of the second member 13. However, the specific configuration of the rotation limiting portion is not particularly limited.

For example, in the above embodiment, a configuration in which the rotation limiting portion is provided on each of the first member 11 and the second member 13 is exemplified, but the rotation limiting portion may be provided on only one of the first member 11 and the second member 13. As an example, the first member 11 may be provided with a resin member that generates a frictional force when it comes into contact with the second member 13 that has moved to the second insertion position.

In addition, instead of the first locking portion 27 and the second locking portion 37, the surface of the abutment portion 25 that abuts against the first inner circumference portion 31 and the surface of the first inner circumference portion 31 that abuts against the abutment portion 25 may each be provided with an uneven shape, and configured so that they engage with each other.

(2b) In the above embodiment, a configuration in which rotation is suppressed when the second member 13 is located at the second rotation position where the first locking portion 27 and the second locking portion 37 engage is exemplified. However, a configuration in which rotation suppression is realized even in positions other than the second rotation position may also be used. For example, a configuration in which multiple first locking portions 27 or second locking portions 37 are provided so as to engage at multiple rotation positions may also be used.

(2c) In the above embodiment, a configuration in which a disc spring is used as the biasing portion is exemplified, but the biasing portion may be an elastic member such as a spring other than a disc spring. For example, one or more coil springs that bias the second member 13 in the detachment direction may be used.

(2d) In the above embodiment, the biasing unit 15 biases the second member 13 via the rotary blade 17, but the biasing unit 15 may be configured to bias the second member 13 directly or via another member without biasing the rotary blade 17.

(2e) Multiple functions possessed by one component in the above embodiments may be realized by multiple components, or one function possessed by one component may be realized by multiple components. Also, multiple functions possessed by multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Also, part of the configuration of the above embodiments may be omitted. Also, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments.

[Technical idea disclosed in this specification]
[Item 1]
A rotary blade holder for holding a rotary blade used in a slitter device,
a first member including an insertion portion configured to be inserted into a through hole provided in the center of the rotary blade, and a main body portion disposed at one end in a longitudinal direction of the insertion portion and preventing the rotary blade from falling off from the one end;
a second member having an annular shape configured so that the insertion portion can be inserted therein, configured to be rotatable about the insertion portion, and configured to prevent the rotary blade from falling off the insertion portion when the insertion portion is inserted;
a contact portion provided on the first member, the contact portion contacting the second member when the second member is in a predetermined rotation position to prevent the second member from being removed from the insertion portion;
a rotation limiting portion provided on at least one of the first member and the second member, which does not limit rotation about the insertion portion when the second member is located at a first insertion position relatively closer to the main body portion, and which limits the rotation when the second member is located at a second insertion position relatively farther from the main body portion than the first insertion position;
a biasing portion that biases the second member from the first insertion position toward the second insertion position.
[Item 2]
Item 1: A rotary blade holder according to item 1,
The rotation limiting portion limits the rotation when the second member is in the predetermined rotation position.
[Item 3]
Item 1 or 2: A rotary blade holder according to the present invention,
The biasing portion biases the rotary blade inserted into the insertion portion, thereby biasing the second member via the rotary blade.
[Item 4]
The rotary blade holder according to any one of items 1 to 3,
The rotation limiting portion includes a first locking portion provided on the first member and a second locking portion provided on the second member,
A rotary blade holder, wherein the second engaging portion does not engage with the first engaging portion when the second member is located at the first insertion position, and engages with the first engaging portion to limit the rotation when the second member is located at the second insertion position.
[Item 5]
Item 5: A rotary blade holder according to any one of items 1 to 4,
the first locking portion is a protruding piece protruding from the insertion portion,
The rotary blade holder, wherein the second engaging portion is a notch configured to engage with the first engaging portion when the second member is in the predetermined rotational position.

1...rotary blade holder, 11...first member, 13...second member, 15...biasing portion, 17...rotary blade, 21...insertion portion, 21a...first support portion, 21b...second support portion, 23...main body portion, 25...contact portion, 27...first locking portion, 27a...threaded portion, 31...first inner circumference portion, 33...second inner circumference portion, 35...notch, 37...second locking portion

Claims (5)

A rotary blade holder for holding a rotary blade used in a slitter device,
a first member including an insertion portion configured to be inserted into a through hole provided in the center of the rotary blade, and a main body portion disposed at one end in a longitudinal direction of the insertion portion and preventing the rotary blade from falling off from the one end;
a second member having an annular shape configured so that the insertion portion can be inserted therein, configured to be rotatable about the insertion portion, and configured to prevent the rotary blade from falling off the insertion portion when the insertion portion is inserted;
a contact portion provided on the first member, the contact portion contacting the second member when the second member is in a predetermined rotation position to prevent the second member from being removed from the insertion portion;
a rotation limiting portion provided on at least one of the first member and the second member, which does not limit rotation about the insertion portion when the second member is located at a first insertion position relatively closer to the main body portion, and which limits the rotation when the second member is located at a second insertion position relatively farther from the main body portion than the first insertion position;
a biasing portion that biases the second member from the first insertion position toward the second insertion position. The rotary blade holder according to claim 1,
The rotation limiting portion limits the rotation when the second member is in the predetermined rotation position. The rotary blade holder according to claim 1,
The biasing portion biases the rotary blade inserted into the insertion portion, thereby biasing the second member via the rotary blade. The rotary blade holder according to claim 1,
The rotation limiting portion includes a first locking portion provided on the first member and a second locking portion provided on the second member,
A rotary blade holder, wherein the second engaging portion does not engage with the first engaging portion when the second member is located at the first insertion position, and engages with the first engaging portion to limit the rotation when the second member is located at the second insertion position. The rotary blade holder according to claim 4,
the first locking portion is a protruding piece protruding from the insertion portion,
The rotary blade holder, wherein the second engaging portion is a notch configured to engage with the first engaging portion when the second member is in the predetermined rotational position.