Vibration suppression member and drum device

Abstract

To provide a vibration suppression member that can suppress vibrations of a winding drum. [Solution] A vibration suppression member (40) is disposed between the shaft hole wall (13) constituting the shaft hole (12) of a winding drum (10) and a support member (22) inserted into the shaft hole (12) to suppress vibration of the winding drum (10), characterized in that it has an inclined surface (40a) that is inclined to approach the rotational axis of the shaft hole (12) as it moves toward the direction in which the support member (22) is inserted into the shaft hole (12).

Description

Technical Field

[0001] The present invention relates to a vibration suppression member and a drum device.

Background Art

[0002] There is known a take-up drum for winding a linear body such as a LAN cable or an optical fiber. For example, Patent Document 1 discloses a partitioned take-up drum for winding an optical fiber.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The above-described take-up drum has a shaft hole, and a support member is inserted into the shaft hole so that the take-up drum rotates. When the take-up drum rotates, the shaft hole wall constituting the shaft hole may be worn by the support member, and a gap may occur between the shaft hole wall and the support member. This gap may cause vibration when the take-up drum rotates and may generate a large impact sound.

[0005] An object of the present invention is to provide a vibration suppression member capable of suppressing vibration of a take-up drum and a drum device having the vibration suppression member.

Means for Solving the Problems

[0006] According to one aspect of the present invention for solving the above problems, a vibration suppression member disposed between a shaft hole wall constituting a shaft hole of a take-up drum and a support member inserted into the shaft hole for suppressing vibration of the take-up drum, A vibration suppression member is provided, characterized by having an inclined surface that slopes toward the rotational axis of the shaft hole as it moves toward the direction of insertion of the support member into the shaft hole.

[0007] To solve the above problems, according to one aspect of the present invention, The winding drum and A support member inserted into the shaft hole of the winding drum and for supporting the winding drum, A vibration suppression member is disposed between the shaft hole wall constituting the shaft hole of the winding drum and the support member, A drum device is provided, characterized by having the following features. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a vibration suppression member that can suppress vibrations of a winding drum, and a drum device having the vibration suppression member. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a front view of a drum device according to an embodiment of the present invention. [Figure 2] Figure 2A is a cross-sectional view showing a vibration suppression member positioned between the shaft hole wall constituting the shaft hole of the winding drum and the support member inserted into the shaft hole. Figure 2B is a partially enlarged view of Figure 2A. [Figure 3] Figure 3A is a side view of the vibration suppression member, Figure 3B is a top view, and Figure 3C is an enlarged cross-sectional view along line CC in Figure 3B. [Modes for carrying out the invention]

[0010] The drum device and vibration suppression member according to preferred embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to the following embodiments. In this specification, with respect to the notation "~" indicating a numerical range, the lower limit and upper limit are included in that numerical range.

[0011] [Drum device] Figure 1 shows a front view of the drum device 1. The drum device 1 includes a winding drum 10, a rotating support section 20 for rotatably supporting the winding drum 10, and a base 30 for supporting the rotating support section 20. The rotating support section 20 has a pair of pintles 21, one on each side, that sandwich the winding drum 10 in the direction in which the rotation axis of the winding drum 10 extends. Each of the two pintles 21 supports the winding drum 10 by sandwiching it while being spaced apart in the direction in which the rotation axis of the winding drum 10 extends. The rotating support section 20 also has a moving mechanism that moves the two pintles 21 closer to or further away from each other. The rotating support section 20 may also have a drive unit for rotating the pintles 21 and consequently rotating the winding drum 10. In this embodiment, the drive unit is a motor that rotates the pintles 21. The winding drum 10 is fixed to the pintle 21 by a drum fixing part of the pintle 21. As a result, the winding drum 10 rotates in conjunction with the rotation of the pintle 21.

[0012] The drum fixing portion is not particularly limited as long as it can fix the winding drum 10 to the pintle 21. In this embodiment, the drum fixing portion has a structure that fits into the spoke-like structure of the flange 11 of the winding drum 10 and fixes it by gripping the spoke. In this way, the winding drum 10 is fixed to the pintle 21. Alternatively, the drum fixing portion may be a convex portion that fits into a recess of the flange 11.

[0013] Figure 2A is a cross-sectional view showing the state in which the support member 22 of the pintle 21 is inserted into the shaft hole 12 of the winding drum 10, thereby supporting the winding drum 10 so that it can rotate. The support member 22 is a member that extends in the direction of the rotation axis. Figure 2B is a partially enlarged view of Figure 2A. Figures 2A and 2B are cross-sectional views including the rotational axis and vertical axis of the winding drum 10.

[0014] As shown in Figures 2A and 2B, a vibration suppression member 40 is positioned between the shaft hole wall 13 that constitutes the shaft hole 12 of the winding drum 10 and the support member 22 inserted into the shaft hole 12. This suppresses vibration of the winding drum 10. In particular, the vibration suppression member 40 suppresses vibration and reduces impact noise when the shaft hole wall 13 that constitutes the shaft hole 12 wears down. Details of the vibration suppression member 40 will be described later with reference to Figures 3A to 3C.

[0015] The objects that can be wound onto the winding drum 10 are not particularly limited. Examples of objects that can be wound include linear objects. Examples of linear objects include various cables, electric wires, optical fibers, tube-shaped objects, etc. Examples of cables include electric wire cables, LAN cables, etc. The winding drum 10 may also wind long objects other than linear objects. Examples of long objects other than linear objects include long films, long metals (e.g., rolled metals), etc.

[0016] A winding drum may be used as a dispensing side to unwind a wound object, or as a winding side to wind an object. In this embodiment, the winding drum 10 is used as a dispensing side to unwind a wound object (LAN cable). The winding drum 10 includes not only a windable drum but also a windable bobbin. The mass of the winding drum 10 is not particularly limited, but the vibration suppression member 40 according to this embodiment is particularly useful for winding drums with a mass that is prone to wear on the shaft hole wall 13 constituting the shaft hole 12. The mass of the winding drum 10 may be, for example, 100 kg or more when no object is wound on it. In this embodiment, the winding drum 10 weighs about 100 kg to 120 kg when no object is wound on it. The mass of the winding drum 10 may be, for example, 100 kg or more, 300 kg or more, 500 kg or more, or 600 kg or more when an object is wound on it. In this embodiment, the object to be wound is a LAN cable, and the mass of the winding drum 10 in the wound state is approximately 700 kg to 800 kg, more specifically, approximately 600 kg.

[0017] (Vibration suppression member) Figs. 3A to 3C are diagrams showing the configuration of the vibration suppression member 40. Fig. 3A is a side view, Fig. 3B is a plan view, and Fig. 3C is an enlarged cross-sectional view taken along the C-C line of Fig. 3B.

[0018] As shown in Fig. 3A, the vibration suppression member 40 has an inclined surface 40a. As shown in Figs. 2A and 2B, the inclined surface 40a is arranged as follows in the relationship between the shaft hole 12 and the support member 22. That is, as shown in Figs. 2A and 2B, when the vibration suppression member 40 is arranged between them, its inclined surface 40a is inclined so that it approaches the rotation center axis of the shaft hole 12 as the support member 22 is inserted into the shaft hole 12. Thereby, the vibration suppression member 40 functions like a wedge between them and suppresses vibration.

[0019] The more detailed arrangement of the vibration suppression member 40 is as follows. That is, as shown in Fig. 2B, one end of the inclined surface 40a of the vibration suppression member 40 is arranged between the support member wall 23, which is the surface of the support member 22 extending in the direction of the rotation axis, and the shaft hole wall 13. On the other hand, the other end of the inclined surface 40a of the vibration suppression member 40 is arranged between the support member base wall 25 of the support member base 24, which is the base of the support member 22 extending in a direction perpendicular to the rotation axis, and the shaft hole peripheral wall 14 around the shaft hole 12.

[0020] The vibration suppression member 40 is not particularly limited as long as it has the inclined surface 40a as described above. The inclined surface 40a is formed so that its thickness decreases from the side closer to the rotation center axis to the side farther away as shown in Fig. 3A. Also, as shown in Fig. 3B, the vibration suppression member 40 is preferably ring-shaped when viewed in plan. The inclined surface of the ring shape 40a is formed so that its thickness decreases from the inner edge 41 to the outer edge 42 of the ring.

[0021] In this embodiment, the inner diameter of the ring-shaped vibration-dampening member 40 (more precisely, the minimum inner diameter of the inclined surface 40a) is smaller than the inner diameter of the shaft hole 12, while the outer diameter of the vibration-dampening member 40 (more precisely, the maximum outer diameter of the inclined surface 40a) is larger than the inner diameter of the shaft hole 12. The inclined surface 40a is positioned between the inner edge 41 and the outer edge 42 of the ring and has a portion that has the same diameter as the inner diameter of the shaft hole 12. As a result, the inclined surface 40a is positioned such that a portion of its rotation axis side (inner edge 41 side) is inserted into the shaft hole 12, while a portion of its opposite side (outer edge 42 side) is not inserted into the shaft hole 12. The inner diameter, outer diameter, and inclined surface 40a of the ring can be appropriately set to match the inner diameter of the shaft hole 12. In particular, the inner diameter of the shaft hole 12 may change in a direction that increases due to wear of the shaft hole wall 13, so the ring can be appropriately designed in accordance with this change.

[0022] Furthermore, it is preferable that the inner diameter of the ring be configured to fit into the support member 22. For this reason, it is preferable that the inner diameter of the ring be the same as the outer diameter of the support member 22, or slightly larger considering the fitting tolerance. By fitting the vibration suppression member 40 into the support member 22, when the support member 22 and a portion of the vibration suppression member 40 are removed from the shaft hole 12, the vibration suppression member 40 can maintain its fitted state in the support member 22, preventing the vibration suppression member 40 from being trapped in the shaft hole 12. On the premise that the ring will not be removed from the support member 22, the inner diameter of the ring may be slightly smaller than the outer diameter of the support member 22.

[0023] For example, the inner diameter of the vibration damping member 40 may be approximately 30 mm to 90 mm, the outer diameter approximately 50 mm to 110 mm, and the thickness (thickness of the wall constituting the inner diameter) approximately 5 mm to 15 mm. In particular, if the thickness is thin, the lifespan of the vibration damping member 40 may be shortened. Therefore, it is preferable that the thickness of the vibration damping member 40 be 8 mm or more, or 9 mm or more.

[0024] As shown in Figure 3C, the vibration damping member 40 is approximately a right triangle when viewed in cross-section including the rotational axis. The hypotenuse of the approximately right triangle corresponds to the inclined surface 40a. The shape of the right triangle is not particularly limited, but it is sufficient to design it appropriately so that a part of the inclined surface 40a is inserted into the shaft hole 12 and the other part is not inserted, as described above. In this embodiment, the shape of the right triangle is an approximately right isosceles triangle in which a part of the corner of the part inserted into the shaft hole 12 is cut off. By cutting off a part of the corner of the vibration damping member 40, it is possible to prevent injury to workers when they touch the vibration damping member 40, and the vibration damping member 40 can be handled safely and easily. One of the two sides that form the right angle in the right triangle is positioned to contact and lie along the support member base wall 25, and the other is positioned to contact and lie along the support member wall 23. The hypotenuse corresponding to the inclined surface 40a when viewed in cross-section may be a straight line, a convex curve, or a concave curve.

[0025] In this embodiment, the inclined surface 40a of the vibration suppression member 40 is a surface of rotation (side surface of a frustum of a cone) obtained when the generatrix, with a straight line (hypotenuse), rotates around the rotational axis. However, as it is used, it becomes concave, and the generatrix becomes a concave curved surface of rotation (concave surface). In this embodiment, the inclined surface 40a is a curved surface at a 45° angle with respect to a plane perpendicular to the rotation axis, but as it is used, it becomes a concave surface.

[0026] The material of the vibration damping member 40 is not particularly limited as long as it has the required durability, wear resistance, and sliding properties. Examples of materials for the vibration damping member 40 include metals and resins. Examples of resins include nylon and bakelite (cloth bakelite). Examples of metals include gunmetal. Examples of nylon include nylon 6 and monomer cast nylon. Of these, nylon is preferred for the vibration damping member 40 from the viewpoint of durability and a certain degree of sliding properties, and monomer cast nylon (MC nylon: registered trademark) is particularly preferred.

[0027] The inventors conducted durability tests on vibration damping members 40 constructed from various materials to determine which material is suitable for the vibration damping member 40. Specifically, they fabricated vibration damping members 40 using monomer cast nylon, cloth bakelite, and bronze, and investigated the period until the vibration damping member 40 broke and fell off, rendering it unusable. As a result, monomer cast nylon could be used for approximately 3 months, and cloth bakelite for approximately 3 weeks. On the other hand, although bronze had a vibration damping effect, it deformed during use, making it difficult to remove from the shaft hole 12, so the durability test was discontinued. From this, it was found that resin is preferred for the vibration damping member 40, and monomer cast nylon is particularly preferred from the viewpoint of durability.

[0028] (effect) The vibration suppression member 40 according to this embodiment can suppress vibrations of the winding drum 10. In particular, if the vibration suppression member 40 is used in the winding drum 10, where the shaft hole wall 13 constituting the shaft hole 12 is prone to wear due to abrasion, vibrations can be suppressed. This reduces the need to replace the shaft hole 12 with a worn shaft hole wall 13 with a new, expensive shaft hole 12 with an unworn shaft hole wall 13, thereby lowering the operating cost of the drum device 1. Furthermore, if the vibration suppression member 40 according to this embodiment is used, wear of the shaft hole wall 13 is suppressed, which also suppresses vibrations. The vibration suppression member 40 may be used in a worn shaft hole 12 or an unworn shaft hole 12. If the vibration suppression member 40 is used in the shaft hole 12, wear of the shaft hole wall 13 is suppressed, extending the life of the shaft hole 12 and lowering the operating cost of the drum device 1. In addition, by suppressing vibrations of the winding drum 10, damage to the entire drum device 1 is reduced, and the life of the drum device 1 is extended. [Industrial applicability]

[0029] The vibration suppression member according to the present invention is useful for suppressing vibrations of a winding drum. [Explanation of Symbols]

[0030] 1. Drum device 10 reel drums 11 Flange 12 shaft holes 13 Axle hole wall 14 Wall around the shaft hole 20 Rotating support part 21 Pintle 22 Support member 23 Support member wall 24 Support member base 25 Support member base wall 30 bases 40 Vibration suppression member 40a Slope 41 Common-law marriage 42 Outer edge

Claims

1. A vibration suppression member is positioned between the shaft hole wall constituting the shaft hole of a winding drum and a support member inserted into the shaft hole, for suppressing vibration of the winding drum, The support member is characterized by having an inclined surface that slopes toward the rotational axis of the shaft hole as it moves toward the direction of insertion of the support member into the shaft hole. Vibration suppression member.

2. A vibration suppression member according to claim 1, characterized in that it is ring-shaped.

3. A vibration suppression member according to claim 1, characterized in that the cross-sectional shape including the rotational axis is a substantially right triangle with the inclined surface as the hypotenuse.

4. A vibration suppression member according to claim 1, characterized in that it is made of monomer cast nylon.

5. The winding drum and A support member inserted into the shaft hole of the winding drum and for supporting the winding drum, A vibration suppression member according to any one of claims 1 to 4, disposed between the winding drum and the support member, A drum device characterized by having the following features.

Images