KR20210024977A - Conducting device and roller conveyor apparatus - Google Patents

Abstract

According to the present invention, a conducting apparatus comprises: a housing (100) having a hanging/matching part (11) which hangs on and matches an end unit of a roller shaft; a shaft member (40) made of conductive materials, protruding from the inside of the housing to the outside through an opening formed on the housing; a bearing (50) which rotatably supports the shaft member against the housing inside the housing; and conduction units (20, 30) which elastically come in contact with the shaft member and electrically connect the shaft member and the housing. The housing includes: a mainframe unit (10) which has an inner space which is able to accommodate the bearing and the conduction units; and a cover unit (60) which hangs on/matches the mainframe unit to block the inner space and to encapsulate the bearing and the conduction units in the inner space. The mainframe unit and the cover unit become unified by being spirally engaged with each other. The present invention aims to provide the conducting apparatus and the roller conveyor apparatus, which are able to propose a structure which can be easily assembled.

Description

A conductive device and a roller conveyor device TECHNICAL FIELD

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

For example, in a processing process for manufacturing a device by processing various substrates such as a glass substrate for a display device or an electronic circuit board, the substrate is generally conveyed by a roller conveyor device. Static electricity is generated due to rotation of the roller shaft of the roller conveyor apparatus or friction between the roller and the substrate, thereby deteriorating or destroying the substrate or the device formed on the substrate. As a countermeasure to this problem, it is conceivable to install an ionizer for static electricity 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 relates to a grounding device for grounding the roller shaft by being attached to an end portion of the roller shaft, via a ground wire. In this device, a conductive shaft is rotatably provided with respect to a housing that can be attached to an end portion of the roller shaft, and a ground wire is connected to the conductive shaft. With this structure, the housing rotates in accordance with the rotation of the roller shaft, and rotation of the conductive shaft, which causes twisting of the ground wire, is suppressed.

Korean Patent 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 complex, and a great effort is required for assembling. In particular, when each component including an elastic pressure spring is mounted in the housing and fixed with screws, it is very difficult to fix the screw using a tool while pressing the component that is going to protrude by the restoring force of the spring. It takes time.

The present invention has been made in view of the above problems, and its 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. Further, it is a second object to provide a roller conveyor device capable of preventing damage to a substrate by static electricity by grounding a 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 line, and in order to achieve the first object, a housing having an engaging portion engaged with an end portion of the roller shaft 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 with respect to the housing in the housing, And a conductive portion that elastically contacts 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 material having conductivity, the bearing and the body portion having an inner space capable of accommodating the conductive portion, a through hole serving as the opening is formed, and by engaging with the body portion, the The inner space is blocked and the bearing and the conductive portion have a lid portion that seals the inner space, and the body portion and the lid portion are integrated with each other by engaging screw portions provided therein to constitute the housing.

In the present invention constituted in this way, the mounting of the component is completed by covering the body with the cover portion and fixing the screw while the bearing and the conductive portion for supporting the shaft member are accommodated in the inner space of the body portion constituting the housing. For this reason, it is significantly easier to assemble than the 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, in order to achieve the second object, a roller shaft rotating around a central axis, and a roller shaft mounted on the roller shaft and integrally rotated with the roller shaft. Thus, a roller for conveying the object to be conveyed in a predetermined conveyance direction, a conductive device having the above structure attached to an end portion of the roller shaft, and a ground wire connected to the conductive device are provided.

In the invention configured 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 by static electricity in advance.

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. Further, by attaching such a conductive device to the 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 view showing a partial appearance of a configuration example when this conductive device is equipped with a roller conveyor device.
2 is an exploded cross-sectional view showing the internal structure of each component constituting the conductive device.
3 is a flowchart showing an assembling process of the conductive device.
4A is an assembled cross-sectional view of the conductive device.
4B is an assembled cross-sectional view of the conductive device.
5 is a diagram showing a second embodiment of a conductive device according to the present invention.
6A is a diagram showing a third embodiment of a conductive device according to the present invention.
6B is a diagram showing a fourth 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 diagram showing the appearance of a first embodiment of a conductive device according to the present invention. In addition, FIG. 1B is a diagram showing a partial appearance of a configuration example when this conductive device is equipped with a roller conveyor device. 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 a central axis of a substantially cylindrical housing 100.

The shaft member 40 is rotatable with respect to the housing 100 about a rotation axis substantially coincident with the central axis AX of the housing 100. The ground wire 70 is connected to the tip end of the shaft member 40 protruding outward from the housing 100 via a terminal bracket 71. At the end of the housing 100 on the side 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.

1B, the conductive device 1 is attached to the 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 the frames 910 and 910 ( 920 and a plurality of conveying rollers 930 provided in each of the roller shafts 920 are provided. As the roller shaft 920 rotates, the substrate (not shown) supported by the conveying roller 930 is conveyed in a predetermined conveying direction. The roller shaft 920 is conductive, for example, made of metal, and the conveying roller 930 is conductive, for example, made of resin.

The conductive devices 1 are attached to one end portion 921 of each roller shaft 920, respectively. 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. Thereby, the conductive device 1 is attached to the end of the roller shaft 920 and is 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 an earth wire 70, and finally connected to a predetermined ground electrode to be grounded.

Accordingly, it is prevented from damaging the substrate by generating static electricity in the roller shaft 920 in the process of conveying the substrate. When, for example, a glass substrate is conveyed by the conveying roller 930, static electricity is charged to the glass substrate, the roller shaft 920, and the conveying roller 930 due to friction between the glass substrate and the conveying roller 930. Without the conductive device as in the present embodiment, a so-called spark may be generated in which static electricity charged from the conveying roller 930 or the roller shaft 920 discharges toward the substrate. By managing the electric potential of the roller shaft 920 by the conductive device 1, for example, by electrically grounding, such a spark can be prevented.

As the roller shaft 920 rotates, the housing 100 of the conductive device 1 rotates integrally with the roller shaft 920. On the other hand, 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 rotation axis coaxial with the central axis AX of the housing 100. For this reason, when the earth wire 70 is attached, the shaft member 40 does not rotate, and distortion in the earth wire 70 due to the 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 4B. 2 is an exploded cross-sectional view showing the internal structure of each component constituting the conductive device, and FIGS. 4A and 4B are assembled cross-sectional views. In addition, FIG. 3 is a flowchart showing an assembling process of the conductive device.

As shown in Fig. 2, the conductive device 1 includes a housing main body 10, a spring 20, a conductive block 30, a shaft member 40, a bearing 50, and a lid part ( 60), an earth wire 70, a fixing screw 80, and a washer 90 are provided. The shape of each member other than the earth wire 70 has substantially axisymmetric properties, and as shown in Figs. 1A and 2, the conductive device 1 is configured 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 with an upper end open and a lower end closed by being cut out from the center of the upper end of the substantially cylindrical member to a predetermined depth. As a result, an inner space SP for accommodating each component described later is formed in the housing main body 10. A female screw 13 is formed at the periphery of the upper opening of the housing main body 10.

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 that fits into the inner space SP of the housing main body 10.

The conductive block 30 is a component formed of a conductive material, for example, 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 a lower portion of the disk-shaped portion 31 having a diameter larger than the inner diameter of the spring 20. I have. Further, 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 body 10 with the cylindrical portion 32 facing downward. In this way, the cylindrical portion 32 is inserted into the spring 20 so that 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, and the lower end surface 42 is formed in an inverted cone shape. In addition, a female screw 44 is formed in 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 fitting tolerance is applied to the inner diameter of the bearing 50, and a loose fitting state between both is applied. Thereby, for example, it is possible to insert the shaft member 40 through the inner ring of the bearing 50 with light force.

The lid part 60 is a cylindrical part in which the male screw 61 is formed around (outer circumferential surface). The male screw 61 has a shape that is coupled with the female screw 13 of the housing main body 10. These screws are combined to integrate the housing body 10 and the cover portion 60, thereby forming the housing 100. The material of the lid part 60 is not particularly limited, but it is possible to use the same material as the housing main body 10, for example. The inner diameter of the cylindrical portion 62 of the lid portion 60 is set so that an appropriate fitting tolerance is applied to the outer diameter of the bearing 50, and a loose fitting state between the two is applied. Thereby, for example, it is possible to insert the bearing 50 through the lid part 60 with a light force.

On the other hand, the opening diameter in the upper end 63 of the lid part 60 is slightly smaller than the outer diameter of the bearing 50. In other words, the side wall surface of the tubular portion 62 has a structure that is pushed inward (the central axis side) at the upper end thereof. Thereby, the bearing 50 accommodated in the inside of the cylindrical part 62 is prevented from protruding upward than the lid part 60. 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.

The earth wire 70 is connected to the upper end of the shaft member 40. Specifically, the fixing screw 80 is engaged with 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 between the terminal bracket 71 and the washer 90, and the fixing screw 80 is coupled to the female screw 44, so that the terminal bracket 71 is mechanically attached to the shaft member 40. ). Thereby, the earth wire 70 is electrically connected to the shaft member 40.

An example of a step in manufacturing the conductive device 1 by attaching these members is as shown in FIG. 3. Initially, preferably, with the opening of the housing body 10 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 and S102). Further, the spring 20 and the conductive block 30 may be accommodated in the housing body 10 in a state in which they are previously combined.

Next, with the shaft member 40 inserted through 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 pressed against the elastic pressing force by the spring 20, and screwed to the housing body 10 (step S104).

The figure on the left of Fig. 4A shows the state at this time. When the cover part 60 is covered on the bearing 50, each component accommodated in the housing main body 10 is suppressed from protruding outward. In addition, since the lower end of the shaft member 40 is pointed, and a recess 33 (Fig. 2) is formed on the upper part of the conductive block 30 receiving this, the shaft member 40 is formed of the conductive block 30 It also avoids slipping in the horizontal direction on the top and shifting the position. Therefore, the work itself of screwing the cover part 60 and the housing main body 10 serves as a work of installing each component in a regular position. In addition, the assembly work up to this point does not require a special tool. In this way, in this conductive device 1, the assembling operation for integrating each component is extremely simple.

Returning to Fig. 3, the earth wire is connected to the conductive device 1 assembled in this way (steps S106 and S107). Prior to that, the conductive device 1 may be engaged with the roller shaft 920 (step S105). That is, the method of connecting the earth wire 70 after engaging the main body of the conductive device 1 with the roller shaft 920, and the conductive device 1 in a state in which the installation is completed to the earth wire 70 is attached to the roller shaft 920. There may be a method of engaging (in this case, step S105 is executed after step S107). These can be appropriately selected depending on the quality of workability in the field.

The ground wire 70 can be connected as follows. The washer 90 is inserted through the fixing screw 80 (step S106), and the shaft member 40 is inserted through the fixing screw 80 in the mounting hole of the terminal bracket 71 mounted at the end of the earth wire 70. It is fixed to the female screw 44 of (step S107). By doing so, the earth 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 an object to be mounted, is fixed to the larger conductive device 1 or the roller shaft 920. Therefore, the support is relatively easy.

The figure on the right of Fig. 4A 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 via the spring 20, and the spring 20 pushed in It is elastically pressed upward by the restoring force of. 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 portion 41 of the shaft member 40 hits the lower surface of the bearing 50, thereby restricting the upward movement of the shaft member 40 with respect to the bearing 50. 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 pressing 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 lid part 60, the bearing 50 is pressed against the lid part 60. Thereby, the position of each component in the vertical direction is fixed, and each component is prevented from rattle in the housing 100 largely.

4B is a partial cross-sectional view showing in more detail a state in which the shaft member 40, the bearing 50, and the lid part 60 are in contact with each other. 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 their main configurations. When the rolling element 53 rolls between the outer ring 51 and the inner ring 52, a relative rotational motion between the outer ring 51 and the inner ring 52 is realized.

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

Therefore, the upward elastic pressing force F of the spring 20 schematically indicated by a white arrow is pressed by pressing the shaft member 40 against the inner ring 52 of the bearing 50, so that the shaft member 40 and the inner ring ( 52) does not generate displacement, and by pressing the cover portion 60 against the outer ring 51 of the bearing 50, it has an effect that no displacement occurs 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 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 colliding with the conductive block 30. For this reason, the conductive block 30 is required to have good electrical conductivity, low friction coefficient, and high heat resistance. In this embodiment, a carbon (graphite) block is used as suitable for this purpose.

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 to a ground electrode (not shown) is formed via the housing body 10, spring 20, conductive block 30, shaft member 40, and earth wire 70 each made of a conductive material. As a result, static electricity generated on the roller shaft 920 is removed. Thereby, the problem of destroying the substrate to be conveyed or the device formed on the surface thereof by static electricity or deteriorating characteristics is avoided.

The conductive device 1 can be assembled by a simple operation of inserting the main component into the housing body 10 and then covering the lid 60. For this reason, it is possible to assemble without using a special tool and with less man-hours.

Hereinafter, another embodiment of the conductive device according to the present invention will be described. In these embodiments, some structures are different from those of the first embodiment described above, but most of the structures are the same. For this reason, members having the same structure and function as in the first embodiment are denoted by the same reference numerals and detailed description thereof may be omitted.

5 is a diagram showing a second embodiment of a conductive device according to the present invention. In the conductive device 2 of the second embodiment, compared with the first embodiment described above, the structure of the housing is partially different, but the structure excluding this point is the same. Specifically, in the housing main body 210 and the lid portion 260 constituting the housing 200, a female screw 213 is formed on the housing main body 210 side, and a male screw 261 is formed on the lid portion 260 side. ) Is formed, and they bind to each other. Even with such a structure, as in the first embodiment, assembling is simple and the effect that the roller shaft can be reliably grounded can be obtained.

Further, in this structure, it is possible to match the inner diameter of the upper portion of the housing main body 210 to the outer diameter of the bearing 50, for example. In this way, in the step of accommodating the bearing 50 in the housing main body 210 during the assembling process (step S103), rattle of the bearing 50 in the transverse direction is suppressed, and the lid portion 260 is removed. It becomes possible to cover more smoothly. Thereby, workability at the time of assembling is further improved.

6A and 6B are diagrams showing third and fourth embodiments of the conductive device according to the present invention. More specifically, Fig. 6A shows a third embodiment of a conductive device according to the present invention, and Fig. 6B shows a fourth embodiment of the conductive device according to the present invention. In the conductive device 3 of the third embodiment shown in FIG. 6A, the spring 320 is disposed above the bearing 50. More specifically, in this embodiment, a conductive block 330 made of carbon is disposed at the bottom of the inner space SP of the housing main body 310, and a shaft member 340 is provided so as to contact the upper surface thereof. . The shaft member 340 is accommodated in the housing body 310 while being inserted through the bearing 50.

After that, the spring 320 is loaded on the bearing 50 so that the cover part 360 is covered. The opening diameter of the upper end of the cover 363 is smaller than the outer diameter of the spring 320, thereby preventing the spring 320 from protruding. The housing 300 is configured by screwing the cover part 360 to the housing body 310. At this time, the spring 320 contracts, and the restoring force elastically presses the bearing 50 downward. Accordingly, the shaft member 340 rotates while being pressed against the conductive block 330.

In this case, since conduction is made between the shaft member 340 and the conductive block 330, and between the conductive block 330 and the housing body 310, respectively, the spring 320 does not require conductivity. . In addition, it is also possible to have a configuration in which the shaft member 340 abuts the housing body 310 without a conductive block interposed therebetween, as long as a problem does not occur with respect to abrasion resistance.

Further, in this structure, for example, by making the inner diameter of the housing body 310 correspond to the outer diameter of the bearing 50, there is a bump in the transverse direction when the bearing 50 is accommodated in the housing body 310. Can be reduced to a level where there is no problem in practical use. Accordingly, the conductive device 3 can be assembled by mounting the spring 320 to fix the cover portion 360, and the assembly operation becomes easier.

In addition, in this structure, in order to arrange the spring 320 in the housing body 310 with high positional accuracy, and to facilitate the mounting of the cover portion 360 thereafter, as shown in the figure, the housing body 310 It is preferable to form a male screw on and a female screw on the cover part 360.

In addition, in the conductive device 4 of the fourth embodiment shown in Fig. 6B, in place of the spring 20 and the conductive block 30 provided in the conductive device 1 of the first embodiment, conductivity and elasticity are achieved. A leaf spring 420 formed of a material, for example, phosphor bronze, is installed in the housing 400. The leaf spring 420 elastically presses the shaft member 40 upward by its restoring force, thereby pressing the shaft member 40 to the bearing 50 and the bearing 50 to the upper end of the cover member 60. Press on (63). Further, by contacting each of the housing main body 410 and the shaft member 40, they are electrically connected. That is, the leaf spring 420 electrically and elastically connects the shaft member 40 and the housing body 410. This makes it possible to further reduce the number of parts.

Also in the conductive devices 3 and 4 of these embodiments, it is possible to electrically ground the roller shaft through the conductive device. Moreover, the assembling process of accommodating the main parts in the housing main body and fixing them with the lid is also the same as in the first embodiment. For this reason, it is possible to easily assemble the conductive device.

As described above, in the first embodiment described above, the housing main body 10 and the lid part 60 function as the ``main body part'' and the ``cover part'' of the present invention, respectively, and they are integrally formed of the present invention. It functions as a "housing". Moreover, the shaft member 40 and the bearing 50 respectively function as a "shaft member" and a "bearing" of this invention, respectively. In addition, while the spring 20 functions as the ``elastic pressing member'' of the present invention, the conductive block 30 functions as the ``abutting member'' of the present invention, and they function as a ``conductive part'' of the present invention as a unit. I'm doing it. In addition, the male screw 11 formed in the housing main body 10 corresponds to the ``engaging part'' of the present invention, while the female screw 44 formed in the shaft member 40 corresponds to the ``connection part'' of the present invention. . In addition, the earth wire 70 corresponds to the "ground wire" of the present invention.

In addition, in the third embodiment, the spring 320 functions as the "elastic pressing member" of the present invention, while the conductive block 330 functions as the "abutting member" of the present invention, and they are integrated into the present invention. It is functioning as a "conduction part" of. On the other hand, in the fourth embodiment, the leaf spring 420 functions as the "elastic body" of the present invention.

In addition, the present invention is not limited to the above-described embodiments, and various modifications other than those described above can be made without departing from the gist of the present invention. For example, in the above embodiment, the conductive device 1 is connected to the roller shaft 920 through the male screw 11 formed in the housing main body 10. However, the structure for engaging the conductive device to the roller shaft is not limited to this, and other ones can be appropriately used.

Further, for example, in the first to third embodiments, a coil spring is used as a source for generating an elastic pressing force. However, instead of these, an elastic pressing force may be generated using a leaf spring as used in the fourth embodiment or an elastic body such as a conductive resin material.

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

Further, 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 the cover member 60 and the bearing 50 All of the spaces between the outer rings 51 are in a loose fitting state. Instead of this, either side may be in an intermediate fitting or forced fitting state. For example, when the shaft member and the bearing are forcibly fitted, since the gap between the shaft member and the inner ring is fixed at the time of assembling, it is not necessary to provide a diameter expansion portion to the shaft member.

In addition, the housing main body 10 or the like of the above embodiment is entirely formed of a conductive material (for example, metal), but is not limited thereto. That is, it is sufficient if a conductive path connecting the roller shaft and the conductive portion (spring and conductive block) is secured, and the portion not involved in this need not have conductivity.

Further, in the above embodiment, the earth wire 70, the fixing screw 80, and the washer 90 are included in a part of the configuration of the conductive device. When distributing this conductive device as a product, these (especially earth wires) About this, it may be handled as an external component which is not included in a conductive device.

As described above by exemplifying specific embodiments, in the conductive device according to the present invention, for example, the conductive portion is formed of a material having conductivity, and is in contact with the shaft member and electrically connected to the housing. What is necessary is just to have a structure which has an abutting member and an elastic urging member which applies a pressing force that elastically presses in a direction approaching each other between the shaft member and the abutting member. According to this configuration, it is possible to stably ensure electrical conduction even in sliding between the abutting member and the abutting member as the shaft member rotates.

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

Further, for example, the conductive portion may be formed of an electrically conductive material and may be an elastic body 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 as described above, it is possible to combine the function of applying an elastic pressing force to the shaft member and the function of ensuring conduction. It is possible.

Further, for example, the opening may be formed on the side opposite to the engaging portion with respect to the housing. In particular, in this case, a screw that can be coupled to the roller shaft may be formed at the engaging portion coaxially with the rotational shaft of the shaft member. According to this configuration, the roller shaft is extended by the conductive device, and a ground wire is connected to the end thereof, so that the conductive device can be configured compactly.

In addition, for example, the bearing is a radial bearing in which the inner ring and the outer ring can rotate around a relatively one rotation axis, the outer ring abuts 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 has a shape that is larger than the inner diameter of, and may be inserted into the inner ring while one end is located in the housing and the other end opposite to the one end is located outside the housing. According to this configuration, the positional relationship of each component is defined by the housing and the shaft member coming into contact with the bearing, and it is possible to smoothly rotate the shaft member with respect to the housing.

Further, for example, a connection portion for connecting a ground wire may be provided at a portion of the shaft member exposed outside the housing. According to this configuration, even if the housing rotates according to the rotation of the roller shaft, 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 inhibited by the connection of the ground wire. .

This invention can be suitably applied to the use of constructing a 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, 210, 310, 410 Housing main body (main unit, housing)
11 Male thread (part of engagement)
20, 320 spring (elastic pressure member)
30, 330 conductive blocks (abutting member)
40 shaft member
44 Female thread (connection site)
50 bearings (bearings)
60, 260, 360 cover (housing)
70 Earth line (ground line)
100 housing
420 leaf spring (elastic body)

Claims (9)

As a conductive device for electrically connecting a roller shaft of a roller conveyor device to a ground wire,
A housing having an engaging portion engaged with an end portion 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 rotatably supporting the shaft member with respect to the housing in the housing,
And a conductive portion elastically abutting the shaft member and electrically connecting between the shaft member and the housing to form a conductive path,
The housing,
A body portion formed of a conductive material and having an inner space capable of accommodating the bearing and the conductive portion,
In addition to the through hole forming the opening, the inner space is closed by engaging with the main body part, and the bearing and the conductive part have a cover part sealing the inner space, and the main body part and the cover part The conductive device, wherein each of the installed screw portions is integrated with each other to form the housing. The method according to claim 1,
The conductive part,
An abutting member formed of a conductive material, abutting the shaft member and electrically connected to the housing,
A conductive device comprising an elastic pressing member that applies a pressing force that elastically presses in a direction approaching each other between the shaft member and the abutting member. The method according to claim 2,
The conductive device, wherein the elastic pressing member is formed of an electrically conductive material and is an elastic body inserted between the abutting member and the housing. The method according to claim 1,
The conductive device, wherein the conductive portion is formed of a conductive material and is an elastic body inserted between the shaft member and the housing. The method according to claim 1,
The opening is formed on a side opposite to the engaging portion with respect to the housing. The method of claim 5,
In the engaging portion, a screw capable of being coupled to the roller shaft is formed coaxially with a rotation shaft of the shaft member. The method according to any one of claims 1 to 6,
The bearing is a radial bearing in which an inner ring and an outer ring are rotatable around a relatively one rotation axis, and the outer ring abuts the housing,
The shaft member has a shape in which one end of a rod-shaped member having a diameter less than or equal to the inner diameter of the inner ring is enlarged than the inner diameter of the inner ring, and the one end is in the housing, and the other end opposite to the one end is The conductive device, which is inserted into the inner ring while being located outside the housing. The method according to any one of claims 1 to 6,
A conductive device, wherein a connection portion for connecting the ground wire is provided in 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 integrally rotating with the roller shaft to convey a conveyed object in a predetermined conveyance direction;
The conductive device according to any one of claims 1 to 6 attached to the end of the roller shaft, and
A roller conveyor device comprising a ground wire connected to the conductive device.

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