KR20220037359A - Conducting device and roller conveyor apparatus - Google Patents

Abstract

A conductive device according to the present invention includes: a housing (100) having an engagement portion (11) which engages with an end part of a roller shaft; a shaft member (40) which protrudes to the outside through an opening formed on the housing; a bearing (50) which rotatably supports the shaft member relative to the housing; and conductive parts (20, 30) which are elastically in contact with the shaft member and electrically connect the shaft member with the housing. The housing includes: a body part having an internal space capable of housing the bearing and the conductive parts; and a lid part which engages with the body part to seal the bearing and the conductive parts in the internal space. An annular projection portion is provided at one of the body part and the lid part, and the projection portion is fitted in a fitted portion provided at the other side to integrate the body part with the lid part and thereby form the housing. Accordingly, damage to a transported substrate can be prevented.

Description

Conductive device and roller conveyor device {CONDUCTING DEVICE AND ROLLER CONVEYOR APPARATUS}

The present invention relates to a conductive device for electrically grounding a roller shaft of a roller conveyor device and a roller conveyor device having the same.

For example, in the processing process which processes various board|substrates, such as a glass substrate for display apparatuses and an electronic circuit board, and performs device manufacture, conveying a board|substrate by a roller conveyor apparatus is generally performed. Static electricity is generated due to the rotation of the roller shaft of the roller conveyor apparatus or friction between the roller and the substrate, which may cause deterioration or destruction of the substrate or devices formed on the substrate. As a countermeasure to this problem, it is conceivable to provide an ionizer for static elimination in the conveyance path of the substrate, or to electrically ground the roller shaft, for example.

For example, the technique described in patent document 1 is attached to the edge part of a roller shaft, It is related with the grounding apparatus for grounding a roller shaft via a grounding wire. In this device, a conductive shaft is rotatably provided with respect to a housing attachable to the end of the roller shaft, and a ground wire is connected to the conductive shaft. With this structure, the housing rotates according to the rotation of the roller shaft, but rotation of the conductive shaft, which causes torsion of the ground wire, is suppressed.

Korean Patent Publication No. 10-1401025 (for example, FIG. 3)

The grounding device described in Patent Document 1 has a problem in that the number of parts is large, the structure is complicated, and a great effort is required for assembly. In particular, when mounting each part including the spring for elastic pressure in the housing and fixing it with screws, it is very difficult and long It takes time.

The present invention has been made in view of the above problems, and a first object 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. A second object of the present invention is to provide a roller conveyor device capable of preventing damage to a substrate due to static electricity by grounding the roller shaft.

One aspect of the present 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. 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 in the housing that rotatably supports the shaft member with respect to the housing; and a conductive part that is in elastic contact with the shaft member and electrically connects the shaft member and the housing to form a conductive path.

In addition, the housing is formed of a conductive material and has a body portion having an internal space for accommodating the bearing and the conductive portion, a through hole serving as the opening is formed, and engages with the main body portion to engage the inside of the housing. A continuous annular protrusion part having a cover part sealing the bearing and the conductive part in the internal space by blocking the space, and enclosing the periphery of the internal space on one side of the main body part and the lid part is provided, and the protrusion is provided on the other side different from the one side of the main body and the cover and the protrusion is fitted to a fitting portion having a shape corresponding to the outer periphery shape of the protruding portion, whereby the main body The unit and the cover unit are integrated to constitute the housing.

In the invention configured as described above, in a state in which the bearing and the conductive part for supporting the shaft member are accommodated in the inner space of the body part constituting the housing, the body part is covered with a cover part, and the protrusion part and the fitting part are fitted and fixed to fix the part, assembly is complete. For this reason, assembly is markedly easier than the said prior art. Further, the shaft member is rotatable with respect 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, and in order to achieve the second object, a roller shaft rotating around a central axis, is mounted on the roller shaft, and rotates integrally with the roller shaft and a roller for conveying an object to be conveyed in a predetermined conveying direction, a conductive device having the above structure attached to an end of the roller shaft, and a grounding wire connected to the conductive device.

In the invention constituted as described above, the substrate can be conveyed in a state in which the roller shaft is electrically grounded. Therefore, it is possible to prevent damage to the substrate due to static electricity in advance.

As described above, according to the present invention, it is possible to configure a conductive device capable of easily assembling and reliably grounding the roller shaft. Moreover, damage to the board|substrate conveyed can be prevented by attaching such an electrically-conductive device to a roller conveyor apparatus.

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

1A and 1B are diagrams showing an embodiment of the present invention. More specifically, Fig. 1A is a view showing the appearance of the first embodiment of the conductive device according to the present invention. Moreover, FIG. 1B is a figure which shows the external appearance of a part of a structural example at the time of equipping this electrically conductive apparatus to a roller conveyor apparatus. As shown in FIG. 1A , the conductive device 1 has a structure in which a shaft member 40 is provided so as to protrude on the central axis of a housing 100 having a substantially cylindrical shape.

The shaft member 40 is rotatable with respect to the housing 100 about a rotational axis substantially coincident with the central axis AX of the housing 100 . A ground wire 70 is connected to the tip of the shaft member 40 protruding outward from the housing 100 via a terminal bracket 71 . At an end of the housing 100 opposite to the side on which the shaft member 40 is installed, an external screw 11 is formed coaxially with the central axis AX of the housing 100 .

In each of the following drawings, in order to represent a direction uniformly, an XYZ rectangular coordinate system is set as shown to 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 conductive device 1 is mounted on a roller conveyor device 9 . More specifically, the roller conveyor device 9 includes a pair of frames 910 and 910 arranged in parallel, and a plurality of roller shafts rotatably supported at both ends by these frames 910 and 910 . 920 and a plurality of conveying rollers 930 provided on each roller shaft 920 are provided. As the roller shaft 920 rotates, a substrate (not shown) whose lower surface is supported by the conveying roller 930 is conveyed in a predetermined conveying direction. The roller shaft 920 is made of, for example, metal having conductivity, and the conveying roller 920 is made of, for example, resin having conductivity.

The conductive devices 1 are respectively 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 screw (not shown) is formed at one end 921 of each roller shaft 920 , and the male screw 11 of the conductive device 1 is coupled to the female screw. As a result, the conductive device 1 is mounted on the end of the roller shaft 920 and electrically connected to the roller shaft 920 . The conductive devices 1 attached to each of the plurality of roller shafts 920 are electrically connected to each other via a ground wire 70 , and finally connected to a predetermined ground electrode and grounded.

Thereby, static electricity is generated in the roller shaft 920 in the process of transferring the substrate, and damage to the substrate is prevented. 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 by friction between the glass substrate and the conveyance roller 930. Without the conductive device as in the present embodiment, static electricity charged from the conveying roller 930 or the roller shaft 920 discharges toward the substrate, so-called sparks may occur. By managing the electric potential of the roller shaft 920 by the conductive device 1, for example, by electrically grounding, such sparks can be prevented.

As the roller shaft 920 rotates, the housing 100 of the conductive device 1 rotates integrally with the roller shaft 920 . Meanwhile, the earth wire 70 is mounted on the shaft member 40 , and the shaft member 40 is rotatable with respect to the housing 100 about a rotational axis coaxial with the central axis AX of the housing 100 . For this reason, in the state in which the earth wire 70 is mounted, the shaft member 40 does not rotate, and it is avoided that distortion occurs in the earth wire 70 according to the rotation of the roller shaft 920 .

Hereinafter, a more detailed structure of the conductive device 1 will be described with reference to FIGS. 2 to 5 . 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 thereof. 4A is an exploded perspective view of the housing, and FIG. 4B is a three-dimensional view thereof. 5 is a flowchart showing an assembling 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 part ( 60 , a ground wire 70 , a fixing screw 80 , and a washer 90 are provided. The shape of each member other than the ground wire 70 has substantially axisymmetry, and as shown in FIGS. 1A and 2 , the conductive device 1 is constituted by assembling them in a coaxial shape.

The housing main body 10 is a component integrally comprised with the material which has electroconductivity, for example, metal materials, such as stainless steel, brass, and aluminum. The housing main body 10 has a cylindrical shape cut out from the upper end central part of a substantially cylindrical member to a predetermined depth, the upper end is open, and the lower end is closed. Thereby, in the housing main body 10, the internal space SP for accommodating each component mentioned later is formed. As shown in FIGS. 2 and 4A , at the upper end of the housing body 10 , it is formed in an annular (cylindrical shape) surrounding the inner space SP, and protrudes upward from the housing 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 a size to fit into the inner space SP of the housing body 10 .

The conductive block 30 is a component formed of a material having conductivity, for example, a metal or carbon (graphite). The conductive block 30 has a structure in which a cylindrical portion 32 having a diameter smaller than the inner diameter of the spring 20 is connected to the lower portion of the disk-shaped portion 31 having a larger diameter than the inner diameter of the spring 20. have it Moreover, the recessed part 33 is formed in the upper surface center part of the disk-shaped part 31. As shown in FIG. The conductive block 30 is placed on the spring 20 accommodated in the housing body 10 with the cylindrical portion 32 facing down. In doing so, the conductive block 30 is elastically supported by the spring 20 in a form in which the cylindrical portion 32 is inserted through the inside of 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 portion 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. Moreover, the female thread 44 is formed in the upper end part 43. As shown in FIG.

The bearing 50 is a radial rolling bearing, for example, a commercially available ball bearing can be used. The outer diameter of the shaft member 40 is set so that an appropriate fitting tolerance is applied with respect to the inner diameter of the bearing 50, and it may become a loose fitting state between both. Thereby, with respect to the inner ring of the bearing 50, it can make it possible to insert the shaft member 40 with a light force, for example.

The lid part 60 is a substantially cylindrical component whose inner surface 62 became a cylindrical surface. The inner surface 62 of the cover part 60 is made to correspond to the outer peripheral shape of the protrusion part 12 of the housing main body 10. As shown in FIG. More specifically, the inner diameter of the inner surface 62 which is a cylindrical surface is substantially the same as the outer diameter of the outer peripheral part of the projection part 12 which is similarly cylindrical surface. The protruding portion 12 is fitted to the inner surface 62 , and the housing body 10 and the cover portion 60 are integrated to form the housing 100 . It is preferable that the outer diameter of the projection part 12 is equal to or larger than the inner diameter of the inner surface 62 . In particular, when the outer diameter of the protruding portion 12 is slightly larger than the inner diameter of the inner surface 62, the protruding portion 12 is press-fitted into the inner surface 62, whereby the housing body 10 and the cover portion 60 are firmly fixed ( will become

Although the material of the cover part 60 is not specifically limited, For example, it is possible to use the same material as the housing body 10. As shown in FIG. In addition, the inner diameter of the inner surface 62 of the cover part 60 applies an appropriate fitting tolerance with respect to the outer diameter of the bearing 50, and it is set so that it may become a loose fitting state between both. Thereby, with respect to the cover part 60, it can make it possible to insert the bearing 50 by light force, for example.

On the other hand, the opening diameter in the upper end 63 of the cover part 60 is slightly smaller than the outer diameter of the bearing 50. As shown in FIG. That is, the inner surface 62 has a structure in which it is pushed inward (central axis side) in the upper end thereof. Thereby, it is prevented that the bearing 50 accommodated in the inside of the cover part 60 protrudes upward from the cover part 60. As shown in FIG. That is, the cover part 60 has a function of sealing the spring 20 , the conductive block 30 , the shaft member 40 , and the bearing 50 in 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 the 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 bracket 71 and the washer 90 mounted on one end of the earth wire 70 are sandwiched therebetween and the fixing screw 80 is coupled to the female screw 44, whereby the terminal bracket 71 is mechanically connected to the shaft member 40 ) is bound to Accordingly, the earth wire 70 is electrically connected to the shaft member 40 . In addition, the washer 90 may be previously attached to the fixing screw 80 . That is, the fixing screw 80 may have a washer attached thereto. By doing in this way, workability at the time of assembly can be improved.

An example of the process at the time of attaching these members and manufacturing the electrically-conductive device 1 is as shown in FIG. At first, preferably with the opening of the housing body 10 facing upward, the spring 20 and the conductive block 30 are accommodated in the inner space SP of the housing body 10 in this order ( Steps S101, S102). In addition, the spring 20 and the conductive block 30 may be accommodated in the housing body 10 in a pre-combined state.

Next, in a state in which the shaft member 40 is inserted into the bearing 50 , they are integrally accommodated in the housing body 10 (step S103 ). Then, the cover part 60 is put on the bearing 50, and the cover part 60 is pushed in against the elastic pressing force of the spring 20, thereby fitting the cover 60 to the housing body 10 ( step S104).

When the cover part 60 is put on the bearing 50, it is suppressed that each component accommodated in the housing body 10 protrudes to the outside. In particular, since the lower end of the shaft member 40 is pointed, and the concave portion 33 (FIG. 2) is provided in the upper part of the conductive block 30 receiving it, the shaft member 40 is connected to the conductive block 30. ), sliding in the lateral direction and shifting the position is also avoided. Therefore, the operation itself of fitting the cover part 60 and the housing body 10 also serves as the operation|work which installs each component in a regular position. Moreover, a jig|tool in particular is not required for the assembling work up to this point. In this way, in this conductive device 1, the assembly operation for integrating each component is extremely simple.

A ground wire is connected to the conductive device 1 assembled in this way (step S106). Prior to that, the conductive device 1 may be engaged with the roller shaft 920 (step S105). That is, the method of connecting the ground wire 70 after engaging the main body of the conductive device 1 with the roller shaft 920, and the method of connecting the conductive device 1 in a state where the installation of the conductive device 1 to the ground wire 70 is completed 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 according to the quality of workability in the field.

The connection of the earth 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 insert the fixing screw into the mounting hole of the terminal bracket 71 mounted on the end of the earth wire 70. (80) is passed through and fixed to the female screw (44) of the shaft member (40). In this way, the ground wire 70 is connected to the conductive device 1 . At this time, a tool such as a screwdriver is used to fasten the fixing screw 80 , and the shaft member 40 as a mounting object is fixed to the larger conductive device 1 or the roller shaft 920 . Therefore, its support is relatively easy.

3A shows the state at this time. In this state, in the inner space SP of the housing 100 , the conductive block 30 is electrically connected to the housing body 10 through the spring 20 and It is elastically pressed upward by the restoring force. The shaft member 40 is pressed on 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 through the bearing 50 . The enlarged diameter portion 41 of the shaft member 40 collides with the lower surface of the bearing 50 , whereby the upward movement of the shaft member 40 with respect to the bearing 50 is regulated. 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 , the shaft member 40 , and the bearing 50 . Since the displacement of the upper end of the bearing 50 is regulated by the upper end 63 of the cover portion 60 , the bearing 50 is pressed against the cover portion 60 . Thereby, the position in the up-down direction of each component is fixed, and each component is prevented from rattling large in the housing 100. As shown in FIG.

3B is a partial cross-sectional view showing in more detail abutting state of the shaft member 40 , the bearing 50 , and the cover part 60 . The bearing 50 is, for example, a ball bearing, and is provided with the outer ring 51, the inner ring 52, and the rolling element 53 as the main structure. By rolling the rolling element 53 between the outer ring 51 and the inner ring 52 , a relative rotational motion is realized between the outer ring 51 and the inner ring 52 .

Here, the enlarged diameter portion 41 of the shaft member 40 abuts against the inner ring 52 of the bearing 50 , but does not abut against the outer ring 51 . In other words, the outer diameter of the enlarged diameter portion 41 is set so as to satisfy the above relation. On the other hand, the upper end 63 of the cover part 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 in the upper end 63 of the lid part 60 is set so as to satisfy the above relation.

Therefore, the upward elastic urging force F of the spring 20 schematically indicated by a white arrow presses the shaft member 40 against the inner ring 52 of the bearing 50, thereby forming the shaft member 40 and the inner ring ( No displacement is generated between the bearings 50 and the cover portion 60 is pressed against the outer ring 51 of the bearing 50 , so that displacement is not generated between the cover portion 60 and the outer ring 51 . . On the other hand, between the outer ring 51 and the inner ring 52 rotates smoothly. As a result, free rotation of the shaft member 40 with respect 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 in a state in which it collides with the conductive block 30 . For this reason, the electrically conductive block 30 is requested|required of the property that electrical conductivity is favorable, a friction coefficient is low, and heat resistance is high. In this embodiment, a carbon (graphite) block is used as a thing suitable for this purpose.

The downward displacement of the bearing 50 is regulated by the projection 12 of the housing body 10 being fitted into the inner surface 62 of the cover part 60 . However, since the displacement of the bearing 50 is substantially regulated by the elastic urging 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. Although the outer peripheral surface of the housing 100 is a simple cylindrical surface, there is no problem in particular from a functional point, but as shown to FIG. 1A, in this embodiment, the part is a flat surface. 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 body 10 are parallel to the XZ plane, respectively, and thus parallel to each other flat surfaces (body-side flat surfaces) 15 and 16 are formed. Similarly, flat surfaces (cover-side flat surfaces) 65 and 66 parallel to the XZ plane are formed on the (-Y) side and (+Y) side side surfaces of the lower end of the lid part 60 , respectively.

When the housing body 10 and the cover part 60 are fitted, the flat surface 15 of the housing body 10 and the flat surface 65 of the cover part 60 form the same plane, while the housing body ( These flat surfaces are formed so that the flat surface 16 of 10) and the flat surface 66 of the cover part 60 may make the same plane. In other words, the housing body 10 and the cover part 60 are combined so that the flat surfaces of each other coincide with each other during assembly. Hereinafter, it is assumed that a reference numeral 105 is attached to a plane in which the flat surfaces 15 and 65 are integrated, and a reference numeral 106 is attached to a plane in which the flat surfaces 16 and 66 are integrated.

6 is a view for explaining the effect exerted by the shape of the outer peripheral surface of the housing. When the conductive device 1 is mounted on the roller shaft of the conveyor device, it is assumed that a tool T such as, for example, a spanner is used. At this time, if planes 105 and 106 parallel to each other are formed on the side surface of the housing 100, as shown by a broken line in FIG. 6 , a tool ( T), it is possible to efficiently perform the mounting operation while preventing wastage.

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

First, there is an effect of reducing the size of the housing 100, in particular, reducing the length in the Z direction. The reason is as follows. The Z-direction length Lz of the planes 105 and 106 must be greater than the thickness Tt of the tool T in the same direction. Here, if the planes 105 and 106 are formed on only one side of the housing body 10 and the cover part 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 greater than the thickness Tt of the tool alone. As a result, the length of the entire housing 100 becomes large. By distributing the flat surfaces 105 and 106 to the housing body 10 and the cover part 60 , the housing 100 can be made compact.

Moreover, when the housing 100 is rotated by the tool T, the housing main body 10 and the cover part 60 rotate integrally, and it is avoided that the force in a torsion direction is applied between both. This force acts to weaken the coupling between the housing body 10 and the cover part 60 , but this force does not act in the present embodiment. Therefore, it is possible to avoid occurrence of looseness 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 lid-side flat surface 65 ( 66 ) each have a tool thickness Tt. It is smaller, and it is preferable that the sum total of the lengths La and Lb is equal to or more than the tool thickness Tt (more preferably, it is larger than this). By doing so, the tool T can be reliably engaged with the planes 105 and 106 . In addition, it is avoided that a rotational force is applied to only one of the housing body 10 and the cover portion 60, thereby causing distortion.

In addition, the effect obtained by the distribution of such a flat surface is not limited to the case where the housing main body 10 and the cover part 60 are couple|bonded by fitting like this embodiment. For example, it is effective also in the case where a housing main body and a cover part are couple|bonded by the screw part provided respectively. In such a structure, when a force in a torsional direction is applied between the housing body and the cover portion, serious problems such as looseness or separation between the two occur. As described above, by forming flat surfaces on each of the housing body and the cover and assembling them to fit, it is possible to solve this problem.

As described above, the conductive device 1 according to this embodiment has a function of electrically grounding the roller shaft 920 of the roller conveyor device 9 . Specifically, a conductive path is formed through the housing body 10, the spring 20, the conductive block 30, the shaft member 40, and the ground wire 70 each made of a conductive material to the ground electrode (not shown). Thus, static electricity generated in the roller shaft 920 is removed. Thereby, the problem of destroying the conveyed board|substrate or the device formed on its surface by static electricity or deteriorating the characteristic is avoided.

The 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 without using a special jig tool and with little man-hours.

Moreover, in the housing 100, the housing body 10 and the cover part 60 are fitted through the protrusion part 12 which protruded annularly so that the inner space SP might be enclosed from the housing body 10. As shown in FIG. For this reason, there is also an effect of suppressing the leakage of dust generated in the internal space (SP) according to use to the outside. In the conductive device 1 , the shaft member 40 rotates while sliding with respect to the conductive block 30 . For this reason, in particular, fine particles generated by scraping off the conductive block 30 made of carbon are gradually accumulated in the internal space SP. In this embodiment, it is possible to prevent a gap from being formed between the housing body 10 and the cover part 60, and it is possible to prevent dust from leaking from this gap.

Moreover, when the housing body 10 and the cover part 60 are assembled by press-fitting, both 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. When the housing is configured to be disassembled, it becomes a big problem if the housing is accidentally disassembled in a clean room and dust inside is leaked. By setting it as a structure that cannot be easily disassembled, it becomes possible to avoid such a problem in advance.

Hereinafter, another embodiment of the electrically-conductive device which concerns on this invention is described. In these embodiments, compared with the above-described first embodiment, some structures are different, but many structures are the same. For this reason, about the member which has the structure and function similar to 1st Embodiment, the same code|symbol is attached|subjected and detailed description may be abbreviate|omitted. In addition, since the difference from the said embodiment is mainly in a housing structure, let only the housing be shown.

7A to 7C are views showing another embodiment of a conductive device according to the present invention. In the housing 100a of 2nd Embodiment shown to FIG. 7A, the inner surface of the protrusion part 12a provided in the housing main body 10a becomes a cylindrical surface smoothly continuous with the inner surface 62a of the cover part 60a. That is, the inner diameter of the protrusion 12a and the inner diameter of the cover portion 60a are the same. Even with such a structure, the effect similar to the said embodiment can be acquired. In such a configuration, there is no function to sandwich and support the bearing in the housing body and the cover portion as in the above embodiment, but there is no problem because the bearing is elastically pressed by a spring as described above, so that displacement is regulated.

In the housing 100b of the third embodiment shown in Fig. 7B, opposite to the above embodiment, an annular projection portion 67b extending in the (-Z) direction is provided on the cover portion 60b, and this is the housing body. It has a structure press-fitted in (10b). In this way, the "projection part" may be formed in either the housing main body or the cover part. In addition, in the structure shown in FIG. 7B, workability|operativity may be improved by turning up and down in the reverse direction at the time of assembly. That is, after accommodating each component, such as the bearing 50, in the cover part 60b which turned upside down, it is the order of covering the housing body 10b on the cover part 60b.

Moreover, in the housing 100c of 4th Embodiment shown in FIG. 7C, the annular projection part 12c is formed in the upper end of the housing main body 10c, while the projection part 12c is formed in the lower end of the cover part 60c. A concave portion 68c corresponding to . By fitting the projection portion 12c into the concave portion 68c, the housing body 10c and the lid portion 60c are integrated. Also with this structure, the same effect as that of the above embodiment can be obtained. In contrast to this, the structure may have a structure in which a projection portion is provided at the lower end of the cover portion and a recessed portion corresponding to the projection portion is formed in the upper end of the housing body.

As described above, in the first embodiment described above, the housing main body 10 and the lid part 60 function as the "body part" and the "cover part" of the present invention, respectively, and these are integrally the present invention. It functions as a "housing".

Moreover, the shaft member 40 and the bearing 50 function as "shaft member" and "bearing" of this invention, respectively, respectively. Moreover, while the spring 20 functions as the "elastic pressure member" of the present invention, the conductive block 30 functions as the "abutment member" of the present invention, and these function as a unit as the "conductive part" of the present invention are doing In addition, the protrusion part 12 provided on the housing body 10 functions as a "protrusion part" of the present invention, and the inner surface 62 of the cover part 60 corresponding to this functions as a "fitting part" of the present invention. is functioning Moreover, the female screw 44 formed in the shaft member 40 corresponds to the "connection site|part" of this invention. In addition, the ground wire 70 corresponds to the "ground wire" of the present invention.

In addition, this invention is not limited to above-mentioned embodiment, Unless it deviates from the meaning, it is possible to make various changes other than what was mentioned above. For example, in the above embodiment, the conductive device 1 is connected to the roller shaft 920 via the male screw 11 formed in the housing body 10 . However, the structure for engaging the conductive device to the roller shaft is not limited to this, and it is possible to appropriately use others.

Moreover, for example, in the said embodiment, a coil spring is used as a generation|occurrence|production source of an elastic urging force. However, instead of this, an elastic pressing force may be generated using, for example, a leaf spring or an elastic body such as a conductive resin material. As the material of the leaf spring, it is preferable to have conductivity, for example, a phosphor bronze plate can be suitably applied.

Further, for example, in the first embodiment, conduction between the conductive block 30 and the housing body 10 is ensured by the spring 20 that generates an elastic pressing force. However, the configuration for generating the elastic pressing force and the configuration for ensuring conduction are not necessarily the same, and they may be realized by different members.

For example, in the first embodiment, between the shaft member 40 and the inner ring 52 of the bearing 50 , and between the cover portion 60 and the bearing 50 , in order to facilitate attachment and detachment between parts. All of the spaces between the outer rings 51 are in a loose fitting state. Instead of this, either one may be in an intermediate fit or an interference fit state. For example, when an interference fit between the shaft member and the bearing is performed, since the space between the shaft member and the inner ring is fixed at the time of assembly, it is not essential to provide the diameter expansion part on the shaft member.

In addition, although the whole housing body 10 etc. of the said embodiment is formed with the electroconductive material (for example, metal), it is not limited to this. That is, it is sufficient if the conductive path connecting the roller shaft and the conductive part (spring and conductive block) is secured, and the part not involved in this need not have electrical conductivity.

Further, in the above embodiment, the earth wire 70, the fixing screw 80, and up to the washer 90 are included in a part of the configuration of the conductive device. About it, you may handle it as an external component which is not included in an electrically-conductive device.

As described above with reference to specific embodiments, in the conductive device according to the present invention, the projection portion may be press-fitted into the fitting portion so that the body portion and the lid portion are integrated. According to this structure, since the main body part and the cover part do not come off easily, generation|occurrence|production of the dust which may arise by disassembling this at the site where an electrically-conductive device is installed can be avoided in advance.

Further, for example, the conductive portion is formed of a conductive material and is pressed against the shaft member and electrically connected to the housing while being pressed against each other in a mutually approaching direction between the abutting member, and the shaft member and the abutting member. What is necessary is just to have a structure which has an elastic urging member which applies a pressing force. According to such a structure, electrical conduction|electrical_connection can be ensured stably also in the sliding which arises between the abutting member according to rotation of a shaft member.

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

Moreover, for example, what is necessary is just to be an elastic body formed with the material which has electroconductivity and inserted between the shaft member and the housing|casing. According to this configuration, the shaft member and the housing are electrically and elastically connected by the conductive portion, and similarly to the above, it is necessary to combine the function of applying an elastic pressing force to the conductive portion and the function of ensuring conduction. possible.

Further, for example, the bearing is a radial bearing in which an inner ring and an outer ring are relatively rotatable about one rotational axis, the outer ring abuts against the housing, and the shaft member has one end of a rod-shaped member having a diameter equal to or smaller 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 in a state in which one end is located inside the housing and the other end opposite to the one end is located outside the housing. According to this structure, the positional relationship of each component is prescribed|regulated by the housing and a shaft member abutting against a bearing, and it is possible to rotate a shaft member smoothly with respect to a housing.

Further, for example, a pair of flat surfaces on the main body side parallel to each other with an inner space therebetween are formed on the outer peripheral surface of the body part, and on the outer peripheral surface of the cover part, each of the flat surfaces on the main body side in a state engaged with the body part is formed on the same plane. A pair of cover-side flat surfaces may be provided. According to this configuration, when the conductive device is mounted on the roller shaft, a rotational force applied by a tool such as a spanner is applied to both the housing body and the cover portion. For this reason, it is prevented that a force in a torsional direction is applied between the housing main body and the cover part, and the coupling between the two is loosened.

Moreover, for example, the connection part for connecting a grounding wire may be provided in the part exposed outside the housing among the shaft members. According to this configuration, even if the housing rotates as the roller shaft rotates, the rotation of the shaft member to which the ground wire is connected can be avoided, so that 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 the use which comprises the roller conveyor apparatus which conveys various board|substrates, such as a glass substrate and an electronic circuit board.

1 conductive device
9 Roller Conveyor Device
10, 10a, 10b, 10c Housing body (body part, housing)
12 protuberance
20 spring (elastic pressure member)
30 Conductive block (abutted member)
40 shaft member
44 Female thread (connection part)
50 bearings
60, 60a, 60b, 60c cover part (housing)
62 (cover part) inner surface (fitting part)
70 Earth wire (ground wire)
100, 100a, 100b, 100c housing

Claims (8)

A conductive device for electrically connecting a roller shaft of a roller conveyor device to a ground wire, comprising:
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;
a bearing for rotatably supporting the shaft member with respect to the housing in the housing;
A conductive part in elastic contact with the shaft member and electrically connecting between the shaft member and the housing to form a conductive path
to provide
The housing is
a body portion formed of a conductive material and having an interior space for accommodating the bearing and the conductive portion;
A cover part for sealing the bearing and the conductive part in the internal space by engaging with the main body part and blocking the internal space while forming the through-hole serving as the opening.
have,
A continuous annular protrusion portion surrounding the periphery of the inner space is provided on one side of the main body portion and the cover portion, and the other side of the main body portion and the cover portion is provided on the other side different from the one side, The conductive device according to claim 1, wherein the protrusion is fitted to a fitting portion having a shape corresponding to the outer periphery of the protrusion, whereby the body portion and the cover portion are integrated to form the housing. The method according to claim 1,
and the protrusion portion is press-fitted into the fitting portion so that the body portion and the cover portion are integrated. The method according to claim 1 or 2,
The conductive part,
abutting member formed of a conductive material and abutting against the shaft member and electrically connected to the housing;
An elastic urging member for applying a pressing force by urging between the shaft member and the abutting member in an approaching direction.
having a conductive device. 4. The method according to claim 3,
The said elastic pressing member is an elastic body formed of the material which has electroconductivity, and inserted between the said contact member and the said housing, the electrically conductive device. The method according to claim 1 or 2,
The bearing is a radial bearing in which an inner ring and an outer ring are relatively rotatable around a single axis of rotation, and the outer ring is in contact with the housing,
In the shaft member, one end of a rod-shaped member having a diameter equal to or less than the inner diameter of the inner ring has a shape larger than the inner diameter of the inner ring, and the one end is located in the housing, and the other end opposite to the one end is located outside the housing. A conductive device that is inserted through the inner ring in a state of being moved. The method according to claim 1 or 2,
A pair of body-side flat surfaces parallel to each other with the inner space interposed therebetween are formed on the outer peripheral surface of the main body, and on the outer peripheral surface of the cover, the main body-side flat surfaces are flush with each other in a state engaged with the main body. A pair of cover-side flat surfaces forming a conductive device are formed. The method according to claim 1 or 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 about a central axis;
a roller mounted on the roller shaft and integrally rotating with the roller shaft to convey a conveyed object in a predetermined conveying direction;
The conductive device according to claim 1 mounted on the end of the roller shaft;
a ground wire connected to the conductive device
A roller conveyor device comprising a.

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