KR102601538B1 - Conducting device and roller conveyor apparatus - Google Patents

Abstract

The electrically conductive device according to the present invention includes a housing 100 having an engaging portion 11 for engaging the end of a roller shaft, a shaft member 40 protruding to the outside through an opening formed in the housing, and the shaft member in the housing. It is provided with a bearing 50 that rotatably supports the shaft member and conductive portions 20 and 30 that elastically contact the shaft member and electrically connect the shaft member and the housing. The housing has a main body portion having an internal space capable of accommodating bearings and conductive parts, a cover part that engages with the main body part to seal the bearings and conductive parts in the internal space, and has an annular shape on one side of the main body part and the cover part. The protruding portion is installed, and the protruding portion is fitted into the fitting portion provided on the other side, so that the main body portion and the cover portion are integrated to form a housing.

Description

CONDUCTING DEVICE AND ROLLER CONVEYOR APPARATUS}

This invention relates to a conductive device for electrically grounding the roller shaft of a roller conveyor device and a roller conveyor device provided therewith.

For example, in a processing process for manufacturing devices by processing various substrates such as glass substrates for display devices or electronic circuit boards, the substrate is generally conveyed using a roller conveyor device. Static electricity is generated due to rotation of the roller shaft of a roller conveyor device or friction between the roller and the substrate, which may deteriorate or destroy the substrate or the device formed on the substrate. As a countermeasure to this problem, it is possible to install an ionizer to eliminate static electricity in the substrate transport path, or to electrically ground the roller shaft, for example.

For example, the technology described in Patent Document 1 relates to a grounding device that is mounted on the end of a roller shaft and grounds the roller shaft through a ground wire. In this device, a conductive shaft is rotatably installed in a housing that can be mounted on the end of a roller shaft, and a ground wire is connected to the conductive shaft. With this structure, the housing rotates as the roller shaft rotates, but rotation of the conductive shaft, which causes twisting of the ground wire, is suppressed.

Korean Patent Publication No. 10-1401025 (e.g., Figure 3)

The grounding device described in Patent Document 1 has a problem in that it has a large number of parts, has a complex structure, and requires a lot of effort to assemble. In particular, when each part including the elastic pressing spring is mounted in the housing and fixed with screws, it is very difficult to fix the screws using a tool while pressing the part that is about to protrude due to the restoring force of the spring, and it also requires a long time. It takes time.

This invention was made in view of the above problems, and its first purpose is to propose a structure that is easy to assemble in a conductive device mounted on a roller shaft for the purpose of electrical grounding. In addition, the second purpose is to provide a roller conveyor device that can prevent damage to the substrate due to static electricity by grounding the roller shaft.

One aspect of the invention is a conductive device for electrically connecting a roller shaft of a roller conveyor device to a ground wire, and in order to achieve the first object, a housing having an engaging portion for engaging an end of the roller shaft is provided. and a shaft member formed of a conductive material and protruding from the inside of the housing to the outside through an opening formed in the housing, and a bearing rotatably supporting the shaft member within the housing with respect to the housing; It has a conductive portion that elastically contacts the shaft member and electrically connects the shaft member and the housing to form a conductive path.

The housing is formed of a conductive material and has a main body portion having an internal space capable of accommodating the bearing and the conductive portion, and a through hole serving as the opening is formed, and engages the main body portion to form the inner space. It has a cover part that seals the bearing and the conductive part in the inner space by blocking the space, and a continuous annular protrusion portion surrounding the inner space on one side of the main body part and the cover part. is installed, and the protruding part is installed on the other side of the main body part and the cover part, which is different from the one side, and the protruding part is fitted into a fitting part of a shape corresponding to the outer circumferential shape of the protruding part, so that the protruding part is fitted into the main body. The portion and the cover portion are integrated to form the housing.

In the invention structured in this way, the bearing and the conductive part supporting the shaft member are accommodated in the internal space of the main body part constituting the housing, the cover part is placed on the main body part, and the protruding part and the fitting part are fitted and fixed to secure the part. Assembly is complete. For this reason, assembly is significantly easier than the above-described prior art. Additionally, the shaft member is rotatable relative to the housing. Therefore, by connecting the ground wire to the shaft member, twisting of the ground wire can be suppressed even when the housing rotates integrally with the roller shaft.

In addition, another aspect of the present invention is a roller conveyor device, which, in order to achieve the second object, includes a roller shaft rotating around a central axis, and a roller shaft mounted on the roller shaft and rotating integrally with the roller shaft. It is provided with a roller for conveying the conveyed object in a predetermined conveyance direction, a conductive device of the above-mentioned structure mounted on an end of the roller shaft, and a ground wire connected to the conductive device.

In the invention configured in this way, the substrate can be transported while the roller shaft is electrically grounded. Therefore, it is possible to prevent damage to the substrate due to static electricity.

As described above, according to the present invention, it is possible to construct a conductive device that can be easily assembled and can reliably ground the roller shaft. Additionally, by mounting such a conductive device on a roller conveyor device, damage to the conveyed substrate can be prevented.

1A is a diagram showing the appearance of a first embodiment of a conductive device according to the present invention.
FIG. 1B is a diagram showing the external appearance of a part of a roller conveyor device equipped with a conductive device.
Figure 2 is an exploded cross-sectional view showing the internal structure of each component constituting the conductive device.
Fig. 3A is an assembled cross-sectional view of the conductive device.
3B is a partial cross-sectional view of the conductive device.
Figure 4a is an exploded perspective view of the housing.
Figure 4b is a three-sided view of the housing.
Figure 5 is a flowchart showing the assembly process of the conductive device.
Figure 6 is a diagram explaining the effect exerted by the shape of the outer peripheral surface of the housing.
FIG. 7A is a diagram showing another embodiment of a conductive device according to the present invention.
FIG. 7B is a diagram showing another embodiment of a conductive device according to the present invention.
FIG. 7C is a diagram showing another embodiment of a conductive device according to the present invention.

1A and 1B are diagrams showing one embodiment of the present invention. More specifically, FIG. 1A is a diagram showing the appearance of a first embodiment of a conductive device according to the present invention. 1B is a diagram showing a partial appearance of a configuration example when this electrically conductive device is installed on a roller conveyor device. As shown in FIG. 1A , the electrically conductive device 1 has a structure in which a shaft member 40 is provided so as to protrude on the central axis of a substantially cylindrical housing 100 .

The shaft member 40 is rotatable about the housing 100 about a rotation axis that substantially coincides with the central axis AX of the housing 100. A ground wire 70 is connected to the tip of the shaft member 40 that protrudes outward from the housing 100 via a terminal metal fitting 71. At the end of the housing 100 opposite to the side on which the shaft member 40 is installed, a male screw 11 is formed coaxially with the central axis AX of the housing 100.

In order to uniformly represent directions in each of the drawings below, an XYZ orthogonal coordinate system is set as shown in FIG. 1A. Here, the Z axis is a direction parallel to the central axis of the housing 100, and the XY plane is a coordinate plane perpendicular thereto.

As shown in FIG. 1B, the electrically conductive device 1 is mounted on the roller conveyor device 9. More specifically, the roller conveyor device 9 includes a pair of frames 910, 910 arranged in parallel, and a plurality of roller shafts rotatably supported at both ends by these frames 910, 910. It is provided with (920) and a plurality of transport rollers (930) installed on each roller shaft (920). As the roller shaft 920 rotates, a substrate (not shown) whose lower surface is supported by the conveyance roller 930 is conveyed in a predetermined conveyance direction. The roller shaft 920 is made of conductive metal, for example, and the conveyance roller 920 is made of conductive resin, for example.

The electrically conductive devices 1 are mounted on one end 921 of each roller shaft 920 so that the central axis of the housing 100 coincides with the roller rotation axis. That is, a female thread (not shown) is formed on one end 921 of each roller shaft 920, and the male thread 11 of the conductive device 1 is coupled to this female thread. As a result, the conductive device 1 is mounted on the end of the roller shaft 920 and is electrically connected to the roller shaft 920. The conductive devices 1 mounted on each of the plurality of roller shafts 920 are electrically connected to each other via the ground wire 70, and are ultimately connected to a predetermined ground electrode and grounded.

As a result, static electricity is generated in the roller shaft 920 during the process of transporting the substrate, thereby preventing damage to the substrate. When, for example, a glass substrate is conveyed by the conveyance roller 930, static electricity is charged to the glass substrate, the roller shaft 920, and the conveyance roller 930 due to friction between the glass substrate and the conveyance roller 930. Without a conductive device like this embodiment, static electricity charged from the conveyance roller 930 or the roller shaft 920 may be discharged toward the substrate, resulting in so-called sparks. Such sparks can be prevented by managing the potential of the roller shaft 920 with the conductive device 1, for example by electrically grounding it.

As the roller shaft 920 rotates, the housing 100 of the conductive device 1 rotates integrally with the roller shaft 920. Meanwhile, the ground wire 70 is mounted on the shaft member 40, and the shaft member 40 can rotate with respect to the housing 100 about a rotation axis coaxial with the central axis AX of the housing 100. For this reason, when the ground wire 70 is mounted, the shaft member 40 does not rotate, and twisting of the ground wire 70 due to rotation of the roller shaft 920 is avoided.

Hereinafter, a more detailed structure of the conductive device 1 will be described with reference to FIGS. 2 to 5 . FIG. 2 is an exploded cross-sectional view showing the internal structure of each component constituting the conductive device, and FIGS. 3A and 3B are assembled cross-sectional views. Additionally, Figure 4A is an exploded perspective view of the housing, and Figure 4B is a three-sided view thereof. Additionally, Fig. 5 is a flowchart showing the assembly process of the conductive device.

As shown in FIG. 2, the conductive device 1 includes a housing body 10, a spring 20, a conductive block 30, a shaft member 40, a bearing 50, and a cover portion ( 60), a ground wire 70, a fixing screw 80, and a washer 90. The shape of each member other than the ground wire 70 is generally axially symmetrical, and as shown in FIGS. 1A and 2, the conductive device 1 is formed by assembling them in a coaxial shape.

The housing main body 10 is a component integrally made of a conductive material, for example, a metal material such as stainless steel, brass, or aluminum. The housing main body 10 has a cylindrical shape in which a substantially cylindrical member is cut out from the upper center portion to a predetermined depth, and the upper end is open and the lower end is closed. As a result, an internal space SP is formed within the housing main body 10 to accommodate each component described later. 2 and 4A, at the upper end of the housing main body 10, a protrusion portion is formed in an annular shape (cylindrical shape) surrounding the inner space SP and protrudes upward from the housing main body 10. (12) is installed.

The spring 20 is a coil spring formed of a material having conductivity and elasticity, for example, a metal wire. The outer diameter of the spring 20 is sized to fit into the internal space SP of the housing main body 10.

The conductive block 30 is a component formed of a conductive material, such as metal or carbon (graphite). The conductive block 30 has a structure in which a cylindrical portion 32 having a smaller diameter than the inner diameter of the spring 20 is connected to the lower portion of a disk-shaped portion 31 having a larger diameter than the inner diameter of the spring 20. I have it. Additionally, a concave portion 33 is formed in the central portion of the upper surface of the disk-shaped portion 31. The conductive block 30 is placed on the spring 20 accommodated in the housing main body 10 with the cylindrical portion 32 facing downward. In this way, the cylindrical portion 32 is inserted into the spring 20 and the conductive block 30 is elastically supported by the spring 20 .

The shaft member 40 is a rod-shaped component made of a conductive material, for example, a metal material such as stainless steel, brass, or aluminum. The lower part 41 of the shaft member 40 is partially enlarged to form an enlarged diameter portion 41, and the lower end surface 42 is formed in an inverted cone shape. Additionally, a female thread 44 is formed on the upper end 43.

The bearing 50 is a radial rolling bearing, and for example, a commercially available ball bearing can be used. The outer diameter of the shaft member 40 is set so that an appropriate fit tolerance is applied to the inner diameter of the bearing 50, and the two are in a loose fit state. This makes it possible to insert the shaft member 40 into the inner ring of the bearing 50 with light force, for example.

The cover portion 60 is a generally cylindrical component with an inner surface 62 having a cylindrical surface. The inner surface 62 of the cover portion 60 corresponds to the outer peripheral shape of the protruding portion 12 of the housing main body 10. More specifically, the inner diameter of the inner surface 62, which is a cylindrical surface, is almost the same as the outer diameter of the outer peripheral part of the protruding portion 12, which is also a cylindrical surface. The housing 100 is constructed by fitting the protruding portion 12 into the inner surface 62 to integrate the housing body 10 and the cover portion 60. The outer diameter of the protruding portion 12 is preferably greater than or equal to the inner diameter of the inner surface 62. In particular, when the outer diameter of the protruding part 12 is slightly larger than the inner diameter of the inner surface 62, the protruding part 12 is press-fitted into the inner surface 62, so that the housing main body 10 and the cover part 60 are firmly solidified ( It becomes a product.

The material of the cover portion 60 is not particularly limited, but for example, it is possible to use the same material as the housing main body 10. In addition, the inner diameter of the inner surface 62 of the cover portion 60 is set so that an appropriate fit tolerance is applied to the outer diameter of the bearing 50 so that there is a loose fit between the two. As a result, it is possible to insert the bearing 50 into the cover portion 60 with light force, for example.

On the other hand, the opening diameter at the upper end 63 of the cover portion 60 is slightly smaller than the outer diameter of the bearing 50. That is, the inner surface 62 has a structure that is pushed inward (toward the central axis) at its upper end. As a result, the bearing 50 accommodated inside the cover part 60 is prevented from protruding upward beyond the cover part 60. That is, the cover portion 60 has the function of sealing the spring 20, the conductive block 30, the shaft member 40, and the bearing 50 within the housing 100. Then, the upper end of the shaft member 40 rotatable with respect to the housing 100 protrudes from the opening formed in the upper end 63.

A ground wire 70 is connected to the upper end of this shaft member 40. Specifically, the fixing screw 80 is coupled to the female screw 44 formed on the upper end 43 of the shaft member 40. The terminal fitting 71 and the washer 90 mounted on one end of the ground wire 70 are sandwiched and the fixing screw 80 is coupled to the female screw 44, so that the terminal fitting 71 is mechanically connected to the shaft member 40. ) is combined with. As a result, the ground wire 70 is electrically connected to the shaft member 40. Additionally, the washer 90 may be mounted on the fixing screw 80 in advance. That is, the fixing screw 80 may be equipped with a washer. By doing this, workability during assembly can be improved.

An example of the process when manufacturing the conductive device 1 by mounting these members is as shown in FIG. 5. Initially, the spring 20 and the conductive block 30 are accommodated in the internal space SP of the housing body 10 in this order, preferably with the opening of the housing body 10 facing upward ( Steps S101, S102). Additionally, the spring 20 and the conductive block 30 may be accommodated in the housing main body 10 in a pre-combined state.

Next, with the shaft member 40 inserted into the bearing 50, they are integrally received in the housing body 10 (step S103). Then, the cover 60 is placed on the bearing 50, and the cover 60 is pushed in against the elastic pressing force of the spring 20, thereby fitting the cover 60 into the housing body 10 ( Step S104).

When the bearing 50 is covered with the cover 60, each component accommodated in the housing body 10 is prevented from protruding to the outside. In particular, since the lower end of the shaft member 40 is sharp and a concave portion 33 (FIG. 2) is provided in the upper part of the conductive block 30 that receives it, the shaft member 40 is connected to the conductive block 30. ), slipping laterally on the top and being misaligned are also avoided. Accordingly, the work itself of fitting the cover portion 60 and the housing body 10 also serves as the work of installing each part in its regular position. Additionally, no special tools are required for the assembly work up to this point. In this way, in this electrically conductive device 1, the assembly work for integrating each part is extremely simple.

A ground wire is connected to the conductive device 1 assembled in this way (step S106), but prior to this, the conductive device 1 may be engaged with the roller shaft 920 (step S105). That is, there is a method of engaging the main body of the conductive device 1 to the roller shaft 920 and then connecting the ground wire 70, and a method of connecting the conductive device 1 with the ground wire 70 installed to the roller shaft 920. There is a method of connecting (in this case, step S105 is executed after step S106). These can be appropriately selected depending on the quality of workability in the field.

Connection of the ground wire 70 (step S106) can be performed as follows. Insert the washer 90 into the fixing screw 80 or prepare a fixing screw 80 with a washer 90 and fix it into the mounting hole of the terminal bracket 71 mounted on the end of the ground wire 70. It passes through (80) and is fixed to the female screw (44) of the shaft member (40). By doing this, the ground wire 70 is connected to the conductive device 1. At this time, a tool such as a driver is used to fasten the fixing screw 80, and the shaft member 40, which is the mounting object, is fixed to the larger conductive device 1 or the roller shaft 920. Therefore, its support is relatively easy.

Figure 3a shows the state at this time. In this state, in the internal space SP of the housing 100, the conductive block 30 is electrically connected to the housing main body 10 through the spring 20, and the pressed spring 20 It is elastically pressed upward by the restoring force. The shaft member 40 is pressed against the upper surface of the conductive block 30, and thus the shaft member 40 is also elastically pressed upward.

The shaft member 40 is inserted into the bearing 50. The enlarged diameter portion 41 of the shaft member 40 is in contact with the lower surface of the bearing 50, and thereby the upward movement of the shaft member 40 with respect to the bearing 50 is restricted. In other words, when the shaft member 40 tries to displace upward, the bearing 50 also displaces integrally.

As a result, the spring 20 applies an upward elastic urging force to the conductive block 30, shaft member 40, and bearing 50. Since the displacement of the upper end of the bearing 50 is regulated by the upper end 63 of the cover part 60, the bearing 50 is pressed against the cover part 60. As a result, the position of each component in the vertical direction is fixed, and each component is prevented from shaking significantly within the housing 100.

Figure 3b is a partial cross-sectional view showing in more detail the contact state of the shaft member 40, bearing 50, and cover portion 60. The bearing 50 is, for example, a ball bearing and has an outer ring 51, an inner ring 52, and a rolling element 53 as its main components. By rolling the rolling element 53 between the outer ring 51 and the inner ring 52, relative rotational movement is realized between the outer ring 51 and the inner ring 52.

Here, the enlarged diameter portion 41 of the shaft member 40 is in contact with the inner ring 52 of the bearing 50, but is not in contact with the outer ring 51. In other words, the outer diameter of the enlarged diameter portion 41 is set to satisfy the above relationship. Meanwhile, the upper end 63 of the cover portion 60 is in contact with the outer ring 51 of the bearing 50, but is not in contact with the inner ring 52. In other words, the opening diameter at the upper end 63 of the cover portion 60 is set to satisfy the above relationship.

Therefore, the upward elastic pressing force F of the spring 20, schematically represented by a white arrow, presses the shaft member 40 to the inner ring 52 of the bearing 50, thereby connecting the shaft member 40 and the inner ring ( 52), and by pressing the cover part 60 against the outer ring 51 of the bearing 50, no displacement is generated between the cover part 60 and the outer ring 51. . Meanwhile, the outer ring 51 and the inner ring 52 rotate smoothly. As a result, free rotation of the shaft member 40 relative to the housing 100 is realized.

As the shaft member 40 rotates with respect to the housing 100, the tip of the shaft member 40 slides while hitting the conductive block 30. For this reason, the conductive block 30 is required to have good electrical conductivity, a low coefficient of friction, and high heat resistance. In this embodiment, a carbon (graphite) block is used as it is suitable for this purpose.

By fitting the protruding portion 12 of the housing main body 10 into the inner surface 62 of the cover portion 60, the downward displacement of the bearing 50 is restricted. However, since the displacement of the bearing 50 is substantially regulated by the elastic pressing force of the spring 20 as described above, the regulating action by the housing body 10 is not essential.

Next, the shape of the side outer peripheral surface of the housing 100 will be described. Even if the outer peripheral surface of the housing 100 is a simple cylindrical surface, there is no particular problem in terms of function, but as shown in FIG. 1A, a part of it is a flat surface in this embodiment. More specifically, as shown in the perspective view of FIG. 4A and the three-sided view of FIG. 4B, the (-Y) side side and the (+Y) side side of the housing main body 10 are each parallel to the XZ plane, and therefore parallel to each other. A flat surface (main body side flat surface) 15, 16 is formed. Similarly, flat surfaces (cover side flat surfaces) 65 and 66 parallel to the XZ plane are formed on the (-Y) side side and the (+Y) side side of the lower end of the cover portion 60, respectively.

When the housing main body 10 and the cover part 60 are fitted, the flat surface 15 of the housing main body 10 and the flat surface 65 of the cover part 60 form the same plane, while the housing main body ( The flat surfaces 16 of 10 and the flat surfaces 66 of the cover portion 60 are formed so that they form the same plane. In other words, during assembly, the housing main body 10 and the cover portion 60 are combined so that their flat surfaces match each other. Hereinafter, the plane in which the flat surfaces 15 and 65 are integrated will be designated as 105, and the plane in which the flat surfaces 16 and 66 are integrated will be designated as 106.

Figure 6 is a diagram explaining the effect of the shape of the outer peripheral surface of the housing. It is assumed that when the conductive device 1 is mounted on the roller shaft of the conveyor device, a tool T, for example a spanner, is used. At this time, if parallel planes 105 and 106 are formed on the side surfaces of the housing 100, a tool ( By using T), it is possible to perform mounting work efficiently while preventing slippage.

In addition, the plane 105 is composed of the main body side flat surface 15 and the cover side flat surface 65, while the plane 106 is composed of the main body side flat surface 16 and the cover side flat surface 66. , the following effects can be achieved.

First, there is an effect of making the housing 100 smaller, especially suppressing its length in the Z direction to be small. The reason is as follows. The length Lz of the planes 105 and 106 in the Z direction must be greater than the thickness Tt of the tool T in the same direction. Here, the planes 105 and 106 are formed on only one side of the housing body 10 and the cover portion 60. Then, the Z-direction length of the main body side flat surface 15 (16) or the cover side flat surface 65 (66) must be larger than the thickness (Tt) of the tool. As a result, the overall length of the housing 100 becomes large. By distributing the arrangement of the planes 105 and 106 to the housing body 10 and the cover portion 60, the housing 100 can be made compact.

Additionally, when the housing 100 is rotated by the tool T, the housing main body 10 and the cover portion 60 rotate as one body, thereby avoiding a force in the twist direction being applied between the two. This force acts to weaken the coupling between the housing body 10 and the cover portion 60, but in this embodiment, this force does not act. Therefore, it is possible to avoid looseness occurring between the housing main body 10 and the cover portion 60.

In order to ensure this effect, the Z-direction length La of the main body side flat surface 15 (16) and the Z-direction length Lb of the cover side flat surface 65 (66) are each determined by the tool thickness Tt. It is preferable that it is smaller, and that the sum of the lengths (La, Lb) is equal to or greater than the tool thickness (Tt) (more preferably greater than this). By doing this, the tool T can be reliably engaged with the planes 105 and 106. In addition, twisting due to rotational force being applied to only one of the housing body 10 and the cover portion 60 is avoided.

In addition, the effect obtained by such distribution of flat surfaces is not limited to the case where the housing main body 10 and the cover portion 60 are joined by fitting as in the present embodiment. For example, it is effective even in the case where the housing main body and the cover part are joined by respectively provided screw parts. In this structure, the force in the twisting direction applied between the housing main body and the cover portion causes serious problems such as looseness or separation between the two. It is possible to solve this problem by forming a flat surface on each of the housing main body and the cover portion as described above and assembling them so that they are aligned.

As described above, the electrically conductive device 1 according to this embodiment has the function of electrically grounding the roller shaft 920 of the roller conveyor device 9. Specifically, a conductive path leading to a ground electrode (not shown) is formed via the housing body 10, spring 20, conductive block 30, shaft member 40, and ground wire 70, each made of a conductive material. This eliminates static electricity generated in the roller shaft 920. This avoids the problem that the transported substrate or the device formed on its surface is destroyed by static electricity or its characteristics are deteriorated.

The electrically conductive device 1 can be assembled by a simple operation of accommodating the main components in the housing body 10 and then inserting or press-fitting the cover portion 60. For this reason, it is possible to assemble with a small number of man-hours without using special tools.

In addition, in the housing 100, the housing main body 10 and the cover part 60 are fitted together through a protrusion 12 that protrudes annularly from the housing main body 10 to surround the internal space SP. For this reason, there is an effect of suppressing dust generated in the internal space (SP) from leaking to the outside depending on use. In the conductive device 1, the shaft member 40 rotates while sliding with respect to the conductive block 30. For this reason, in particular, the fine powder generated when the carbon conductive block 30 is chipped gradually accumulates in the internal space SP. In this embodiment, it is possible to prevent a gap from forming between the housing main body 10 and the cover part 60, and to prevent dust from leaking from this gap.

Additionally, when the housing main body 10 and the cover portion 60 are assembled by press fitting, they cannot be easily separated. This is also effective from the viewpoint of dust prevention. The electrically conductive device of this embodiment may be used in a clean room environment. If the housing is configured to be disassembled, it will be a major problem if the housing is accidentally disassembled in a clean room and the dust inside leaks out. By creating a structure that cannot be easily disassembled, it becomes possible to avoid these problems in advance.

Hereinafter, another embodiment of the conductive device according to the present invention will be described. In these embodiments, some structures are different compared to the first embodiment described above, but many structures are the same. For this reason, members having the same structure and function as those in the first embodiment may be given the same reference numerals and detailed descriptions may be omitted. In addition, since the difference from the above embodiment is mainly in the housing structure, only the housing is shown.

7A to 7C are diagrams showing another embodiment of a conductive device according to the present invention. In the housing 100a of the second embodiment shown in FIG. 7A, the inner surface of the protruding portion 12a provided on the housing main body 10a is a cylindrical surface that is smoothly continuous with the inner surface 62a of the cover portion 60a. That is, the inner diameter of the protruding portion 12a and the inner diameter of the cover portion 60a are the same. Even with this structure, the same effect as the above embodiment can be obtained. In this configuration, there is no function to sandwich and support the bearing between the housing body and the cover portion as in the above embodiment, but there is no problem because the displacement of the bearing is regulated by being elastically pressed by a spring as described above.

In the housing 100b of the third embodiment shown in FIG. 7B, contrary to the above embodiment, the cover portion 60b is provided with an annular protruding portion 67b extending in the (-Z) direction, which forms the housing main body. (10b) has a press-fitted structure. In this way, the “projection portion” may be formed on either the housing main body or the cover portion. Additionally, in the structure shown in FIG. 7B, workability may be improved by reversing the top and bottom during assembly. That is, each component such as the bearing 50 is accommodated in the cover portion 60b with the top and bottom reversed, and then the housing body 10b is covered with the cover portion 60b.

Moreover, in the housing 100c of the fourth embodiment shown in FIG. 7C, an annular protruding portion 12c is formed at the upper end of the housing main body 10c, while a protruding portion 12c is formed at the lower end of the cover portion 60c. A corresponding concave portion 68c is formed. By fitting the protruding portion 12c into the concave portion 68c, the housing main body 10c and the cover portion 60c are integrated. Even with this structure, the same effect as the above embodiment can be obtained. Alternatively, a structure may be used in which a protrusion is provided at the bottom of the cover portion and a concave portion corresponding to the protrusion is formed at the top of the housing main body.

As explained above, in the above-described first embodiment, the housing main body 10 and the cover portion 60 function as the “main body portion” and the “cover portion” of the present invention, respectively, and they are integrated into the present invention. It functions as a “housing.”

In addition, the shaft member 40 and the bearing 50 respectively function as the “shaft member” and “bearing” of the present invention. In addition, the spring 20 functions as an “elastic pressing member” of the present invention, while the conductive block 30 functions as an “abutting member” of the present invention, and they together function as a “conductive portion” of the present invention. I'm doing it. In addition, the protruding portion 12 provided on the housing main body 10 functions as a “protruding portion” of the present invention, and the inner surface 62 of the cover portion 60 corresponding thereto functions as a “fitting portion” of the present invention. It is functioning. Additionally, the female thread 44 formed on the shaft member 40 corresponds to the “connection portion” of the present invention. Additionally, the ground wire 70 corresponds to the “ground wire” of the present invention.

Additionally, the present invention is not limited to the above-described embodiments, and various changes other than those described above can be made without departing from the spirit thereof. For example, in the above embodiment, the conductive device 1 is connected to the roller shaft 920 through the external screw 11 formed in the housing main body 10. However, the structure for engaging the conductive device with the roller shaft is not limited to this, and it is possible to use other structures as appropriate.

Also, for example, in the above embodiment, a coil spring is used as a source of elastic pressing force. However, instead of this, for example, an elastic pressing force may be generated using an elastic body such as a leaf spring or a conductive resin material. As a material for the leaf spring, it is desirable to have conductivity, and for example, a phosphor bronze plate can be appropriately applied.

Also, for example, in the first embodiment, electrical connection between the conductive block 30 and the housing main body 10 is ensured by the spring 20 that generates an elastic urging force. However, the configuration for generating the elastic pressing force and the configuration for ensuring conduction do not need to be the same, and they may be realized by different members.

For example, in the first embodiment, in order to facilitate attachment and detachment between parts, between the shaft member 40 and the inner ring 52 of the bearing 50, and between the cover portion 60 and the bearing 50 The space between the outer rings 51 is in a loose fit. Instead of this, either side may be in a middle fit or interference fit state. For example, when an interference fit is made between the shaft member and the bearing, since the space between the shaft member and the inner ring is fixed during assembly, it is not essential to provide an enlarged diameter portion on the shaft member.

In addition, the housing body 10 of the above-mentioned embodiment is formed entirely of a conductive material (for example, metal), but it is not limited to this. In other words, it is sufficient as long as a conductive path connecting the roller shaft and the conductive part (spring and conductive block) is secured, and parts not involved in this do not need to be conductive.

In addition, in the above embodiment, the ground wire 70, the fixing screw 80, and the washer 90 are included as part of the structure of the conductive device. When this conductive device is distributed as a product, these (especially the ground wire) For this reason, it may be treated as an external component that is not included in the electrically conductive device.

As explained above by illustrating specific embodiments, in the conductive device according to the present invention, the protruding portion may be pressed into the fitting portion to integrate the main body portion and the cover portion. According to this configuration, since the main body and the cover do not easily separate, the generation of dust that may be generated by disassembling the conductive device at the site where it is installed can be avoided.

Also, for example, the conductive portion is formed of a conductive material, and is elastically pressed in a direction between an abutting member that contacts the shaft member and is electrically connected to the housing, and the shaft member and the abutting member to approach each other. It may be configured to have an elastic pressing member that applies a pressing force. According to this configuration, electrical conduction can be stably ensured even when sliding occurs between the abutting member and the abutting member as the shaft member rotates.

In this case, for example, the elastic pressing member may be an elastic body formed of a conductive material and inserted between the abutting member and the housing. According to this configuration, the elastic pressing member has both the function of applying an elastic pressing force to the abutting member and the function of ensuring conduction, and it is possible to reduce the number of parts.

Also, for example, the conductive portion may be an elastic body formed of a conductive material and inserted between the shaft member and the housing. According to this configuration, the shaft member and the housing are electrically and elastically connected by the conductive portion, and in the same manner as above, the function of applying an elastic pressing force to the conductive portion and the function of ensuring conduction are combined. possible.

For example, the bearing is a radial bearing in which the inner ring and the outer ring can relatively rotate around one rotating axis, the outer ring is in contact with the housing, and the shaft member has one end of a rod-shaped member having a diameter less than the inner diameter of the inner ring. It may have a shape enlarged from the inner diameter of the inner ring, and may be inserted into the inner ring with one end positioned within the housing and the other end opposite to the one end positioned outside the housing. According to this configuration, the positional relationship of each part is defined by the housing and the shaft member coming into contact with the bearing, and it is also possible to smoothly rotate the shaft member with respect to the housing.

For example, on the outer peripheral surface of the main body, a pair of body-side flat surfaces are formed that are parallel to each other with an internal space in between, and on the outer peripheral surface of the cover part, a pair of flat surfaces on the main body are formed on the same plane while engaged with the main body. A pair of cover-side flat surfaces may be formed. According to this configuration, when mounting the electrically conductive device on the roller shaft, the rotational force applied by a tool such as a spanner is applied to both the housing main body and the cover portion. For this reason, a force in the twist direction is applied between the housing main body and the cover portion, thereby preventing the coupling between the two from becoming loose.

Also, for example, a connection portion for connecting a ground wire may be provided on a portion of the shaft member exposed outside the housing. According to this configuration, even if the housing rotates in accordance with the rotation of the roller shaft, rotation of the shaft member to which the ground wire is connected can be avoided, so the ground wire is not twisted or the rotation of the roller shaft is not inhibited by the connection of the ground wire.

This invention can be suitably applied to applications that constitute a roller conveyor device that transports various substrates, such as glass substrates and electronic circuit boards.

1 conductive device
9 roller conveyor device
10, 10a, 10b, 10c housing body (main body, housing)
12 protruding area
20 Spring (elastic pressing member)
30 Conductive block (abutting member)
40 shaft member
44 female thread (connection part)
50 bearing
60, 60a, 60b, 60c cover (housing)
62 (cover part) inner surface (fitting area)
70 Earth wire (ground wire)
100, 100a, 100b, 100c housing

Claims (8)

A conductive device for electrically connecting the roller shaft of a roller conveyor device to a ground wire,
a housing having an engaging portion for engaging an end of the roller shaft;
a shaft member formed of a conductive material and protruding from the inside of the housing to the outside through an opening formed in the housing;
Within the housing, a bearing that rotatably supports the shaft member with respect to the housing;
A conductive portion that elastically contacts the shaft member and electrically connects the shaft member and the housing to form a conductive path.
Equipped with
The housing is,
a main body portion formed of a conductive material and having an internal space capable of accommodating the bearing and the conductive portion;
A cover portion forming a through hole serving as the opening and sealing the bearing and the conductive portion in the inner space by engaging with the main body portion to block the inner space.
With
A continuous annular protrusion surrounding the periphery of the inner space is provided on one side of the main body and the cover, and is provided on the other side of the main body and the cover that is different from the one side, By fitting the protruding portion into a fitting portion of a shape corresponding to the outer circumferential shape of the protruding portion, the main body portion and the cover portion are integrated to form the housing,
On the outer peripheral surface of the main body part, a pair of main body side flat surfaces are formed parallel to each other with the internal space therebetween, and on the outer peripheral surface of the cover part, in a state engaged with the main body part, each of the main body side flat surfaces is the same plane. A conductive device in which a pair of flat surfaces on the cover side are formed. In claim 1,
A conductive device in which the protrusion portion is press-fitted into the fitting portion to integrate the main body portion and the cover portion. In claim 1 or claim 2,
The conductive part,
an abutting member formed of a conductive material and abutting the shaft member and electrically connected to the housing;
An elastic pressing member that applies a pressing force by elastically pressing between the shaft member and the abutting member in an approach direction.
Having a conductive device. In claim 3,
The electrically conductive device wherein the elastic pressing member is an elastic body formed of a conductive material and inserted between the abutting member and the housing. In claim 1 or claim 2,
The bearing is a radial bearing in which an inner ring and an outer ring can relatively rotate around a single rotation axis, and the outer ring is in contact with the housing,
The shaft member has one end of a rod-shaped member having a diameter smaller than the inner diameter of the inner ring and has a shape enlarged than the inner diameter of the inner ring, the one end is located within the housing, and the other end opposite to the one end is located outside the housing. A conductive device that is inserted and passed through the inner ring in a conditioned state. In claim 1 or claim 2,
A conductive device having a connection portion for connecting the ground wire to a portion of the shaft member exposed outside the housing. a roller shaft rotating around a central axis;
a roller mounted on the roller shaft and rotating integrally with the roller shaft to convey the conveyed object in a predetermined conveying direction;
A conductive device according to claim 1 mounted on an end of the roller shaft,
Ground wire connected to the conductive device
A roller conveyor device comprising: delete

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