Slip ring device

Abstract

An example of a slip ring device capable of improving assembly workability is disclosed. [Solution] The slip ring device has multiple collars 13 stacked along the axial direction, and each of the multiple collars 13 houses a fixed contact 12 and a movable contact 11. The fixed contact 12 and the movable contact 11 are in contact with each other while facing each other in the axial direction. As a result, an assembly worker (including an automated assembly machine) can assemble the slip ring device by stacking the movable contact 11, fixed contact 12, and collar 13 as a set, and the subassemblies 15 that make up the set sequentially in the axial direction. Therefore, the assembly workability of the slip ring device is improved.

Description

Technical Field

[0001] The present disclosure relates to a slip ring device including a movable contact and a fixed contact with which the movable contact makes a sliding contact.

Background Art

[0002] For example, the slip ring device described in Patent Document 1 has a set of an annular (ring-shaped) movable contact and a fixed contact that makes a sliding contact with the outer peripheral surface of the movable contact, and the movable contact and the fixed contact constituting the set are arranged in series in the axial direction.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present disclosure discloses an example of a slip ring device capable of improving the assembly workability.

Means for Solving the Problems

[0005] A slip ring device including a movable contact (11) rotatable about a central axis (Lo) and a fixed contact (12) with which the movable contact (11) makes a sliding contact preferably includes at least one of the following constituent requirements.

[0006] In other words, the configuration requirement is a dish-shaped collar (13) that restricts the rotation of the fixed contact (12) and houses the fixed contact (12) and the movable contact (11), the collar (13) being made of an electrically insulating material, a plurality of collars (13) stacked along the central axis (Lo), each of the plurality of collars (13) housing the fixed contact (12) and the movable contact (11), and furthermore, the fixed contact (12) and the movable contact (11) are in contact with each other while being arranged opposite each other in a direction parallel to the central axis (Lo).

[0007] As a result, assembly workers (including automated assembly equipment) can assemble the slip ring device by sequentially stacking the subassemblies constituting each set of movable contacts (11), fixed contacts (12), and collars (13) in a direction parallel to the central axis (Lo). Therefore, the assembly workability of the slip ring device is improved.

[0008] The slip ring device may also have the following configuration, for example: In other words, the hardness of the fixed contact (12) and the movable contact (11) are different, and the terminal (18) is for electrically connecting the contact (11) with lower hardness to the lead wire (20), and comprises the terminal (18) to which the connecting contact (11B) provided on the contact (11) with lower hardness makes contact, and a holder (14) that supports the terminal (18).

[0009] The terminal (18) has a strip-shaped first plate portion (18A) and a second plate portion (18B) extending substantially parallel to the central axis (Lo), and is configured in a substantially U-shape or substantially J-shape. The terminal (18) is supported by a holder (14) at one end in the direction of extension of the first plate portion (18A), and the first plate portion (18A) and the second plate portion (18B) are connected at the other end in the direction of extension of the first plate portion (18A).

[0010] Furthermore, it is desirable that the second plate-like portion (18B) extends from the connection point with the first plate-like portion (18A) toward one end in the direction of extension of the first plate-like portion (18A), and that the connecting contact (11B) is in contact with the second plate-like portion (18B).

[0011] Furthermore, the device may also include a second terminal (19) for electrically connecting the hardest contact (12) among the fixed contact (12) and movable contact (11) to the lead wire (5), which is a strip-shaped second terminal (19) that is in contact with a second connecting contact (12D) provided on the hardest contact (12). Hereinafter, terminal (18) will be referred to as the first terminal (18), and the above-mentioned connecting contact will be referred to as the first connection point (11B).

[0012] Furthermore, the second terminal (19) extends in a direction parallel to the central axis (Lo) and penetrates all of the multiple collars (13), and it is desirable that at least one of the fixed contact (12) and the movable contact (11) is configured in a ring shape, and that one of the first terminal (18) and the second terminal (19) is located inside the ring and the other terminal (18) is located outside the ring.

[0013] Furthermore, it is desirable that both the fixed contact (12) and the movable contact (11) are configured in a ring shape, and that their respective outer diameters are different, with the contact (12) having greater hardness being configured in a wave-ring shape and being elastically deformable, and that the collar (13) is provided with a movement restricting portion (13B) that contacts the outer diameter side of the contact (11) with the larger outer diameter, thereby restricting the movement of the contact (11) with the larger outer diameter to the contact (12) with the smaller outer diameter.

[0014] Furthermore, the holder (14) is rotatable within the ring, and the holder (14) is provided with a groove (14A) that extends in a direction parallel to the central axis (Lo), and the groove (14A) houses the first terminal (18).

[0015] On the inner diameter side of the movable contact (11), a protrusion (11A) that protrudes toward the holder (14) and fits into the groove (14A) is provided. The movable contact (11) rotates by receiving a rotational force from the holder (14) via the protrusion (11A). It is desirable that the first connection terminal (18) is provided on the protrusion (11A).

[0016] Furthermore, the outer diameter dimension of the portion of the holder (14) where the groove (14A) is provided is substantially equal to the inner diameter dimension of the movable contact (11). Additionally, it is desirable that the inner diameter dimension of the fixed contact (12) is larger than the inner diameter dimension of the movable contact (11).

[0017] Incidentally, the reference numerals in the above parentheses are an example showing the correspondence with the specific configurations and the like described in the embodiments to be described later, and the present disclosure is not limited to the specific configurations and the like indicated by the reference numerals in the above parentheses.

Brief Description of the Drawings

[0018] [Figure 1] It is a diagram showing a slip ring device according to the first embodiment. [Figure 2] It is a diagram showing the structure of a slip ring device according to the first embodiment. [Figure 3] It is an enlarged diagram showing the structure of a slip ring device according to the first embodiment. [Figure 4] It is an explanatory diagram showing the structure of a slip ring device according to the first embodiment. [Figure 5] It is a diagram showing the movable contact and the fixed contact according to the first embodiment. [Figure 6] It is a diagram showing the collar according to the first embodiment. [Figure 7] It is a diagram showing the collar and the like according to the first embodiment. [Figure 8] It is a diagram showing the sub-assembly according to the first embodiment. [Figure 9] It is a diagram showing the structure of the sub-assembly according to the first embodiment. [Figure 10] It is a diagram showing the collar according to the first embodiment. [Figure 11] It is a figure showing a holder according to the first embodiment. [Figure 12] It is a figure showing a first terminal etc. according to the first embodiment. [Figure 13] It is a figure showing a first terminal etc. according to the first embodiment. [Figure 14] It is a figure showing a first terminal according to the first embodiment. [Figure 15] It is a figure showing a first terminal, a second terminal, a movable contact, a fixed contact, etc. according to the first embodiment. [Figure 16] It is a figure showing a second terminal etc. according to the first embodiment. [Figure 17] It is a figure showing a second terminal etc. according to the first embodiment. [Figure 18] A and B are explanatory diagrams of the operation of the first terminal according to the first embodiment.

Modes for Carrying Out the Invention

[0019] The following "Embodiments of the Invention" show an example of embodiments belonging to the technical scope of the present disclosure. That is, the invention-specific matters described in the claims are not limited to the specific configurations, structures, etc. shown in the following embodiments.

[0020] The arrows, slashes, etc. indicating directions attached to each figure are described to facilitate understanding of the relationship between each figure and the shape of each member or part. Therefore, the invention shown in the present disclosure is not limited to the directions attached to each figure. The figure with slashes does not always show a cross-sectional view.

[0021] At least the members or parts described with reference numerals are provided with at least one, unless otherwise stated such as "one". That is, when there is no statement such as "one", the member may be provided with two or more. The slip ring device shown in the present disclosure includes at least one of the components such as the members or parts described with reference numerals and the structural parts shown in the drawings.

[0022] (First Embodiment) <1. Overview of the winding device> In this embodiment, an example of the slip ring device 10 (see Figure 2) according to this disclosure is applied to a slip ring device built into a winding device 1 (see Figure 1) for winding electric wires. Specifically, as shown in Figure 1, the slip ring device 10 is arranged inside the winding drum 2.

[0023] The winding drum 2 is a cylindrical member for winding the electric wire 3. In this embodiment, the electric wire 3 is a 5-core wire, in which multiple electric wires (5 in this embodiment) (hereinafter referred to as core wires) are bundled together to form a single electric wire.

[0024] The shaft 4 supports the winding drum 2 and is a shaft portion that rotates integrally with the winding drum 2. The shaft 4 is rotatably supported by the drum casing (not shown) via a bearing (not shown).

[0025] Each core wire is electrically connected to the corresponding lead wire 5 via a slip ring device 10. Each lead wire 5 is an externally connected electrical wire. Each core wire rotates along with the winding drum 2, while each lead wire 5 does not rotate.

[0026] <2. Configuration of the slip ring device> <2.1 Overview of Slip Ring Devices> As shown in Figure 3, the slip ring device 10 includes at least a movable contact 11, a fixed contact 12, a collar 13, and a holder 14. The movable contact 11 is a metal member that is electrically connected to the electrical wire 3 and is rotatably displaceable together with the shaft 4 about the central axis Lo.

[0027] In this embodiment, the electric wire 3 has multiple core wires, and therefore, the same number of movable contacts 11 as the number of core wires (specifically, five) are provided. The same number of fixed contacts 12 as the movable contacts 11 are also provided.

[0028] Each fixed contact 12 is a metal component that slides into contact with the corresponding movable contact 11 and is electrically connected to the corresponding lead wire 5. The collar 13 restricts the rotation of the fixed contact 12 and is a dish-shaped component that houses the fixed contact 12 and the movable contact 11.

[0029] The collar 13 is made of an electrically insulating material such as resin. At least the same number of collars 13 as the number of movable contacts 11 are provided. Specifically, in this embodiment, as shown in Figure 4, one set of subassemblies 15 is made up of one movable contact 11, one fixed contact 12, and one collar 13.

[0030] Furthermore, multiple subassemblies 15 are sequentially stacked in a direction parallel to the central axis Lo. In other words, in this embodiment, five subassemblies 15 are stacked along the central axis Lo to constitute the slip ring body 16.

[0031] In other words, multiple collars 13 are stacked along the central axis Lo, and each of these multiple collars 13 houses a fixed contact 12 and a movable contact 11. The fixed contact 12 and the movable contact 11 that constitute the subassembly 15 are in contact with each other, while being positioned opposite each other in a direction parallel to the central axis Lo.

[0032] Note that the color 13L located at the left edge of the paper is a common part with the same shape as the color 13 that makes up the slip ring body 16, but it does not make up the sub-assembly 15. The color 13L functions as a cover that closes the left edge of the slip ring body 16.

[0033] The slip ring body 16 (including the collar 13L) is housed in a roughly cylindrical storage casing 17, as shown in Figure 2. The storage casing 17 is fixed to a stationary part of the winding device 1.

[0034] <2.1 Details of the slip ring device> <Movable contacts, fixed contacts> In this embodiment, all of the multiple movable contacts 11 are common parts having the same shape. Similarly, all of the multiple fixed contacts 12 are common parts having the same shape.

[0035] Therefore, in the following, when simply referred to as "movable contact 11," it refers to any of the multiple movable contacts 11. Similarly, when simply referred to as "fixed contact 12," it refers to any of the multiple fixed contacts 12.

[0036] As shown in Figure 4, the movable contact 11 is configured in an annular (ring-shaped) form. Similarly, the fixed contact 12 is also configured in an annular (ring-shaped) form. In this embodiment, the outer diameter of the movable contact 11 is larger than the outer diameter of the fixed contact 12. On the other hand, the inner diameter of the fixed contact 12 is larger than the inner diameter of the movable contact 11.

[0037] Furthermore, in this embodiment, the movable contact 11 is made of a material with lower hardness than the fixed contact 12, while the fixed contact 12 is made of a material with strong spring properties. Specifically, the movable contact 11 is made of brass, and the fixed contact 12 is made of phosphor bronze.

[0038] Furthermore, the fixed contact 12 is configured in a wave-like shape and is elastically deformable. Specifically, the fixed contact 12, which is configured in a link shape, is provided with a bent portion 12A that is bent so as to be convex toward the movable contact 11, as shown in Figure 5.

[0039] As the bending angle of the bent portion 12A changes, the fixed contact 12 functions as a spring. In this embodiment, multiple bent portions 12A are provided. This is to ensure the reliability and durability of the electrical connection between the fixed contact 12 and the movable contact 11.

[0040] The movable contact 11 is made of a flat, ring-shaped plate without any bends. Therefore, when the shaft 4 rotates, the multiple bends 12A are displaced relative to the ring-shaped movable contact 11.

[0041] <Color> In this embodiment, all of the multiple colors 13 (including color 13L) are common parts having the same shape. Therefore, when "color 13" is simply referred to below, it refers to any of the multiple colors 13.

[0042] As shown in Figure 6, the collar 13 is a dish-shaped member capable of housing the fixed contact 12 and the movable contact 11. The collar 13 is made of an electrically insulating material such as resin (e.g., POM). As described above, one collar 13 houses one fixed contact 12 and one movable contact 11 (see Figure 8).

[0043] The collar 13 is provided with at least one rotation restricting portion 13A. The rotation restricting portion 13A is a part that restricts the rotation of the fixed contact 12. Specifically, the fixed contact 12 is provided with a projection 12B that protrudes radially outward, as shown in Figure 5.

[0044] The rotation restricting portion 13A is configured as a fitting portion into which the projection 31A can be fitted (see Figure 7). In this embodiment, the collar 13 is provided with multiple rotation restricting portions 13A. Each rotation restricting portion 13A is provided at equal intervals on the circumference centered on the central axis Lo.

[0045] As shown in Figure 9, a movement restricting portion 13B is provided in the part of the color 13 where the movable contact 11 and the fixed contact 12 are housed. The movement restricting portion 13B is a stepped portion that restricts the movable contact 11 from moving downward in the plane of the paper in Figure 9.

[0046] In other words, the movement restricting unit 13B contacts the outer diameter side of the contact with the larger outer diameter (in this embodiment, the movable contact 11) among the fixed contact 12 and the movable contact 11, thereby restricting the movable contact 11 from moving toward the contact with the smaller outer diameter (in this embodiment, the fixed contact 12).

[0047] Furthermore, on the side of the collar 13 opposite to the part where the movable contact 11 etc. are housed, at least one (multiple in this embodiment) projection 13C and positioning portion 13D are provided, as shown in Figure 10.

[0048] The projection 13C is a protrusion that fits into the hole 12C (see Figure 9) provided in the projection 12B of the fixed contact 12. The positioning portion 13D is a portion that fits into the rotation restricting portion 13A of adjacent collars 13. As a result, two adjacent collars 13 are positioned relative to each other.

[0049] On the side of the collar 13 opposite to the portion housing the movable contact 11, etc., at least one (multiple in this embodiment) groove or projection (projection 13E in this embodiment) is provided, as shown in Figure 9. The tip of the projection 13E slides into contact with the movable contact 11 housed in the adjacent collar 13 (sub-assembly 15).

[0050] Therefore, the movable contact 11 is sandwiched between the movement restricting portion 13B and the protrusion 13E. As a result, the displacement of the movable contact 11 in the direction parallel to its central axis Lo is restricted. The displacement of the movable contact 11 in the direction perpendicular to its central axis Lo is restricted by the collar 13 in which the movable contact 11 is housed.

[0051] Furthermore, all collars 13 are fixed to the storage casing 17 in a non-rotatable state. Therefore, all collars 13 and fixed contacts 12 are immobile relative to the storage casing 17 without rotating.

[0052] <Holder> As shown in Figure 2, the holder 14 is rotatably supported on the shaft 4 and can rotate integrally with the winding drum 2. In this embodiment, the winding drum 2 and the holder 14 are connected via the shaft 4.

[0053] In other words, the holder 14 is rotatable within the slip ring body 16, that is, within the ring-shaped movable contact 11 and fixed contact 12. Furthermore, as shown in Figure 11, the outer circumferential surface of the holder 14 is provided with the same number of grooves 14A as the rotation restricting portion 13A of the collar 13.

[0054] The groove 14A extends in a direction parallel to the central axis Lo. Each of the multiple grooves 14A is provided at equal intervals along the circumferential direction of the outer surface of the holder 14. Hereinafter, when simply referred to as "groove 14A," it means either the multiple grooves 14A collectively or any individual groove 14A.

[0055] As shown in Figure 2, the groove 14A houses the first terminal 18. The first terminal 18 is a terminal for electrically connecting the contact with lower hardness (in this embodiment, the movable contact 11) among the fixed contact 12 and the movable contact 11 to the lead wire 20 (see Figure 1).

[0056] Furthermore, as shown in Figure 2, the projection 11A of the movable contact 11 is fitted into the groove 14A. The projection 11A is the part that protrudes from the inner diameter edge of the movable contact 11 toward the holder 14 (center of the inner diameter), as shown in Figure 8.

[0057] Each projection 11A is offset from the others on the circumference centered on the central axis Lo. Each projection 11A is fitted into the corresponding groove 14A. Therefore, each movable contact 11 rotates by receiving rotational force from the holder 14 via the projection 11A.

[0058] <Terminal 1 and Terminal 2> The first terminal 18 electrically connects the contact with low hardness, that is, the movable contact 11, to the lead wire 20. Specifically, as shown in Figure 12, the first connection contact 11B provided on the projection 11A is in contact with the first terminal 18.

[0059] The same number of first terminals 18 are provided as the number of movable contacts 11. Each first terminal 18 is positioned in a groove 14A facing each projection 11A. Hereafter, when simply referred to as "first terminal 18," it refers to any of the first terminals 18.

[0060] The first connection contact 11B located at one end in the axial direction is in contact with the first terminal 18 at that end (see Figure 12). The first connection contact 11B located at the other end in the axial direction is in contact with the first terminal 18 at that other end (see Figure 13). Note that the axial direction refers to the direction parallel to the central axis Lo.

[0061] As shown in Figure 14, the first terminal 18 has a first plate-like portion 18A and a second plate-like portion 18B, and is configured in a substantially U-shape or substantially J-shape. The first plate-like portion 18A and the second plate-like portion 18B are metal strip-like portions that extend substantially parallel to the axial direction.

[0062] Specifically, the first plate-like portion 18A and the second plate-like portion 18B are connected at the other end of the first plate-like portion 18A in the direction of extension (the left edge of the page in Figure 14). The second plate-like portion 18B extends from the connection point 18C toward one end of the first plate-like portion 18A in the direction of extension (the right edge of the page in Figure 14).

[0063] The first terminal 18 is supported by the holder 14 at one end in the extending direction of the first plate-shaped portion 18A (the right edge of the page in Figure 14) (see Figure 2). The first connecting contact 11B is in contact with the second plate-shaped portion 18B (see Figures 12 and 13). All of the first terminals 18 are located inside the ring-shaped movable contact 11 and fixed contact 12, as shown in Figure 15.

[0064] A second terminal 19 is positioned outside the movable contact 11 and the fixed contact 12. The second terminal 19 is a terminal for electrically connecting the contact with the greater hardness (in this embodiment, the fixed contact 12) to the lead wire 5.

[0065] The same number of second terminals 19 are provided as the number of fixed contacts 12. Each second terminal 19 is positioned opposite the projection 12B of each fixed contact 12 (see Figure 15). Hereafter, when simply referred to as "second terminal 19," it refers to any second terminal 19.

[0066] As shown in Figure 16, the second terminal 19 is a strip-shaped member that has contact with a contact with high hardness, i.e., a second connecting contact 12D provided on the fixed contact 12. Each second connecting contact 12D is provided at the tip of the corresponding projection 12B.

[0067] Therefore, the second connecting contact 12D located at one axial end is in contact with the second terminal 19 at that axial end (see Figure 16). The second connecting contact 12D located at the other axial end is in contact with the second terminal 19 at that other axial end (see Figure 17).

[0068] All second terminals 19 extend axially and penetrate all of the multiple collars 13. In the parts of the collars 13 where the rotation restricting portion 13A is provided, a through hole 13F (see Figure 10) is provided through which the second terminal 19 is inserted.

[0069] <3. Features of the slip ring device according to this embodiment> In this embodiment, the slip ring device 10 has multiple collars 13 stacked along the axial direction, and each of the multiple collars 13 houses a fixed contact 12 and a movable contact 11. The fixed contact 12 and the movable contact 11 are in contact with each other while being arranged opposite each other in the axial direction.

[0070] As a result, assembly workers (including automated assembly equipment) can assemble the slip ring device 10 by sequentially stacking the subassemblies 15 that make up the movable contact 11, fixed contact 12, and collar 13 as a set, in the axial direction. Therefore, the assembly workability of the slip ring device 10 is improved.

[0071] The first plate-shaped portion 18A is supported by the holder 14 at one end in the extension direction, and the first plate-shaped portion 18A and the second plate-shaped portion 18B are connected at the other end in the extension direction. The second plate-shaped portion 18B extends from the connection point with the first plate-shaped portion 18A toward one end in the extension direction of the first plate-shaped portion 18A, and the first connecting contact 11B is in contact with the second plate-shaped portion 18B.

[0072] This makes it possible to suppress large fluctuations in the contact pressure between the first terminal 18 and the first connection contact 11B, regardless of which part of the axial direction the first connection contact 11B contacts the first terminal 18.

[0073] In other words, when the first connecting contact 11B contacts the first terminal 18 at one end in the extension direction (the right side of the page in Figure 18A), as shown in Figure 18A, mainly the second plate-like portion 18B bends and deforms, while the first plate-like portion 18A does not bend and deform significantly. The reason for this is as follows.

[0074] The first plate-like portion 18A is a cantilever beam with one end in the extension direction (right side of the paper in Figure 18A) fixed, and the second plate-like portion 18B is a cantilever beam with the other end in the extension direction (left side of the paper in Figure 18A) fixed.

[0075] Therefore, when the first connection contact 11B contacts the first terminal 18 at one end in the extension direction (right side of the page in Figure 18A), the pressing force F generated by this contact presses against one end in the extension direction (right side of the page in Figure 18A) of the second plate-shaped portion 18B that forms a cantilever beam.

[0076] In other words, the pressing force F acts on the second plate-like portion 18B at a point away from the other end in the extension direction that forms the fixed end (the left side of the paper in Figure 18A). As a result, the second plate-like portion 18B mainly undergoes bending deformation, while the first plate-like portion 18A does not undergo significant bending deformation.

[0077] Furthermore, when the first connection contact 11B contacts the first terminal 18 at the other end in the extension direction (the left side of the page in Figure 18B), as shown in Figure 18B, mainly the first plate-like portion 18A bends and deforms, while the second plate-like portion 18B does not bend and deform significantly. The reason for this is as follows.

[0078] The second plate-like portion 18B is a cantilever beam with its other end in the extension direction (left side of the paper in Figure 18B) fixed, and the first plate-like portion 18A is a cantilever beam with its one end in the extension direction (right side of the paper in Figure 18B) fixed.

[0079] Therefore, when the first connection contact 11B contacts the first terminal 18 at the other end in the extension direction (left side of the paper in Figure 18B), the pressing force F generated by this contact presses the extension direction end (left side of the paper in Figure 18B) of the second plate-shaped portion 18B that forms a cantilever beam.

[0080] Furthermore, since the extensional end of the cantilevered second plate-like portion 18B is the fixed end of the cantilevered second plate-like portion 18B, mainly the first plate-like portion 18A undergoes bending deformation, while the second plate-like portion 18B does not undergo significant bending deformation.

[0081] The amount of deflection deformation of the first terminal 18 is the sum of the amount of deflection deformation of the first plate-like portion 18A and the amount of deflection deformation of the second plate-like portion 18B. Furthermore, the greater the position where the pressing force F is applied, the further it shifts from the other end in the extension direction (left side of the paper in Figure 18A) to the one end in the extension direction (right side of the paper in Figure 18A), the greater the deflection and deformation of the second plate-like portion 18B.

[0082] Furthermore, the greater the position where the pressing force F is applied, the further it shifts from one end in the extension direction (right side of the paper in Figure 18A) to the other end in the extension direction (left side of the paper in Figure 18A), the greater the first plate-like portion 18A will bend and deform.

[0083] As a result, regardless of which part the first connection contact 11B contacts the first terminal 18, the amount of deflection deformation of the first terminal 18 does not change significantly, thus suppressing large fluctuations in the contact pressure between the first terminal 18 and the first connection contact 11B.

[0084] Furthermore, if the first terminal 18 were composed solely of the first plate-like portion 18A, when the first connecting contact 11B contacts the first terminal 18 at a position closer to the other end in the extension direction (left side of the paper in Figure 18B), the first plate-like portion 18A forming the first terminal 18 would bend and deform more significantly compared to when the first connecting contact 11B contacts the first terminal 18 at a position closer to the one end in the extension direction (right side of the paper in Figure 18B).

[0085] Therefore, if the first terminal 18 is composed only of the first plate-like portion 18A, the amount of deflection deformation of the first terminal 18 will vary greatly depending on the part of the first connection contact 11B that makes contact, resulting in a large variation in the contact pressure between the first terminal 18 and the first connection contact 11B.

[0086] The collar 13 is provided with a movement restricting part 13B that contacts the contact with the larger outer diameter among the fixed contact 12 and the movable contact 11, i.e., the outer diameter side of the movable contact 11, thereby restricting the movement of the movable contact 11 to the contact with the smaller outer diameter, i.e., the fixed contact 12 side.

[0087] This suppresses large fluctuations in the distance between the fixed contact 12 and the movable contact 11, and therefore can suppress large fluctuations in the contact pressure between the fixed contact 12 and the movable contact 11. Consequently, it becomes possible to stably slide the fixed contact 12 and the movable contact 11 into contact.

[0088] The movable contact 11 rotates by receiving rotational force from the holder 14 via the projection 11A. The outer diameter of the part of the holder 14 where the groove 14A is provided is approximately equal to the inner diameter of the movable contact 11, and furthermore, the inner diameter of the fixed contact 12 is larger than the inner diameter of the movable contact 11.

[0089] This makes it possible to rotate the movable contact 11 stably. In other words, since the movable contact 11 rotates by receiving rotational force from the projection 11A, if a rotational force is applied from the holder 14 to the tip side of the projection 11A, the movable contact 11 will tilt, making it impossible to rotate the movable contact 11 stably.

[0090] In contrast, in this embodiment, the outer diameter of the part of the holder 14 where the groove 14A is provided is approximately equal to the inner diameter of the movable contact 11, and the inner diameter of the fixed contact 12 is larger than the inner diameter of the movable contact 11. Therefore, a rotational force acts from the holder 14 on the base side of the projection 11A.

[0091] This can prevent the movable contact 11 from tilting due to the rotational force received from the holder 14, thus making it possible to rotate the movable contact 11 stably. (Other embodiments) In the embodiment described above, the first terminal 18 was configured in a J-shape or a U-shape. However, the disclosure is not limited thereto. That is, the disclosure may, for example, configure the first terminal 18 in a simple strip shape similar to the second terminal 19.

[0092] In the above-described embodiment, a stepped movement restricting portion 13B was provided. However, this disclosure is not limited thereto. That is, the disclosure may also include, for example, a configuration in which the movement restricting portion 13B is abolished, or a movement restricting portion 13B composed of a projection.

[0093] In the above-described embodiment, the outer diameter of the movable contact 11 was larger than the outer diameter of the fixed contact 12, the inner diameter of the fixed contact 12 was larger than the inner diameter of the movable contact 11, and the movable contact 11 was made of a material with lower hardness than the fixed contact 12. However, the present disclosure is not limited thereto.

[0094] Furthermore, if the movable contact 11 is made of a material with greater hardness than the fixed contact 12, it is desirable to configure the second terminal 19 in the same way as the first terminal 18, and the first terminal 18 in the same way as the second terminal 19.

[0095] In the embodiments described above, the fixed contact 12 was configured in a wave-like shape and was elastically deformable. However, the disclosure is not limited thereto. That is, the disclosure may also include, for example, a movable contact 11 that is configured in a wave-like shape and is elastically deformable.

[0096] Furthermore, this disclosure is not limited to the embodiments described above, but is sufficient to be consistent with the intent of the disclosures described in the embodiments described above. Therefore, it may be a configuration in which at least two of the embodiments described above are combined, or a configuration in which any of the illustrated components or components described with reference numerals in the embodiments described above are omitted. [Explanation of symbols]

[0097] 1… Winding device 2… Reel 3… Electric wires 4… Shaft 5… Lead wire 10… Slip ring device 11... Movable contact 11A… Protrusion 11B… First connection contact 12… Fixed contact 12D… Second connection contact 13… Color 13A… Rotation restricting section 13B… Movement Restriction Section 14… Holder 15… Subassembly 16… Slip ring body 17… Storage casing 18... 1st terminal 19... 2nd terminal 20… Lead wire

Claims

1. In a slip ring device comprising a movable contact that can rotate about a central axis, and a fixed contact with which the movable contact makes sliding contact, The rotation of the fixed contact is restricted, and the fixed contact and the movable contact are housed in a dish-shaped collar made of an electrically insulating material, Multiple of the aforementioned collars are stacked along the central axis, and each of the multiple collars houses the fixed contact and the movable contact. Furthermore, the slip ring device is such that the fixed contact and the movable contact are in contact with each other while being positioned opposite each other in a direction parallel to the central axis.

2. The hardness of the fixed contact and the hardness of the movable contact are different. A terminal for electrically connecting the "contact with low hardness" among the fixed contact and the movable contact to a lead wire, wherein the terminal to which the connecting contact provided on the "contact with low hardness" makes contact, The system includes a holder that supports the terminals, The terminal has a strip-shaped first plate portion and a second plate portion extending substantially parallel to the central axis, and is configured in a substantially U-shape or substantially J-shape. The terminal is supported by the holder at one end in the extending direction of the first plate-shaped portion. The first plate-like portion and the second plate-like portion are connected at the other end in the extension direction of the first plate-like portion, and the second plate-like portion extends from the connection point toward one end in the extension direction of the first plate-like portion. Furthermore, the slip ring device according to claim 1, wherein the connecting contact is in contact with the second plate-shaped portion.

3. When the aforementioned terminal is designated as the first terminal and the aforementioned connection contact as the first connection point, A second terminal for electrically connecting the "high-hardness contact" among the fixed contact and the movable contact to a lead wire, comprising a strip-shaped second terminal into which a second connection contact provided on the "high-hardness contact" makes contact, The second terminal extends in a direction parallel to the central axis and penetrates all of the multiple collars. Furthermore, the slip ring device according to claim 2, wherein at least one of the fixed contact and the movable contact is configured in a ring shape, and of the first terminal and the second terminal, one terminal is located inside the ring and the other terminal is located outside the ring.

4. The fixed contact and the movable contact are both ring-shaped, and their outer diameters are different. The aforementioned "high hardness contact point" is configured in a wave-like shape and is elastically deformable. Furthermore, the slip ring device according to claim 3, wherein the collar is provided with a movement restricting portion that contacts the outer diameter side of the "contact with a larger outer diameter" among the fixed contact and the movable contact, thereby restricting the movement of the "contact with a larger outer diameter" towards the "contact with a smaller outer diameter".

5. The holder is located within the ring and is rotatable. The holder is provided with a groove that extends in a direction parallel to the central axis, the groove in which the first terminal is housed. The inner diameter side of the movable contact is provided with a projection that protrudes toward the holder and fits into the groove. The movable contact rotates by receiving rotational force from the holder via the projection. Furthermore, the slip ring device according to claim 4, wherein the first connection terminal is provided on the projection.

6. The outer diameter of the portion of the holder in which the groove is provided is approximately equal to the inner diameter of the movable contact. Furthermore, the slip ring device according to claim 5, wherein the inner diameter of the fixed contact is larger than the inner diameter of the movable contact.

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