TW202109721A - Conductive device and roller conveying device having electric grounding roller shafts to prevent electrostatic discharge damage to substrate - Google Patents

Abstract

The invention discloses a structure which is easy to assemble in a conductive device mounted to a roller shaft and a roller conveying device for the purpose of electric grounding. The conductive device of the invention includes: a shell (100) having an engaging portion (11) to be engaged with the end of roller shaft; a shaft member (40) formed of conductive material and protruded from the interior of the shell to the outside through an opening disposed on the shell; a bearing (50) disposed inside the shell for rotatably supporting the shaft member relative to the shell; and, conductive portions (20, 30) elastically abutted against the shaft member to electrically connect the shaft member with the shell. The shell includes: a main body (10) having an internal space for receiving the bearing and the conductive portions; and a cap (60) engaged with the main body to block the internal space for sealing the bearing and the conductive portions in the internal space. The main body and the cap are screwed together as a whole to form the shell.

Description

Conductive device and roller conveying device

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

For example, in the process of processing various substrates such as glass substrates for display devices and electronic circuit substrates to manufacture components, the substrates are usually conveyed by a roller conveyor. The rotation of the roller shaft of the roller conveying device or the friction between the roller and the substrate generates static electricity, which may cause deterioration or damage to the substrate or the components formed on the substrate. As a solution to this problem, it is conceivable to provide an ionizer for eliminating static electricity 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 that is attached to the end of a roller shaft for grounding the roller shaft via a ground wire. In the above-mentioned device, a conductive shaft is rotatably provided with respect to the housing which can be mounted on the end of the roller shaft, and a ground wire is connected to the conductive shaft. With this structure, the housing rotates with the rotation of the roller shaft, but the rotation of the conductive shaft, which causes the twisting of the ground wire, is suppressed. [Prior Art Literature] [Patent Literature]

Patent Document 1: Korean Patent No. 10-1401025 (for example, Figure 3)

[The problem to be solved by the invention]

The grounding device described in Patent Document 1 has the following problems: the number of parts is large, the structure is complicated, and the assembly requires a lot of labor. In particular, the following work is very difficult and takes a long time. The work involves assembling each part including the spring for urging in the housing and fixing it with screws, while pressing the spring to fly due to the restoring force. Use tools to perform screwing operations on the parts that are drawn out.

The present invention was made in view of the above-mentioned problems, and its first object is to propose a structure that is easy to assemble in a device that is mounted on a roller shaft for the purpose of electrical grounding. In addition, the second object of the present invention is to provide a roller transport device that can prevent damage to the substrate by static electricity by grounding the roller shaft. [Means to solve the problem]

One aspect of the present invention is a conductive device, which is used to electrically connect the roller shaft of the roller conveying device with a ground wire. In order to achieve the first object, the conductive device includes: a housing having a housing that is engaged with the roller shaft The engagement part of the end; the shaft member, which is formed of a conductive material and protrudes from the inside of the housing to the outside through the opening provided in the housing; the bearing, in the housing, is opposite to the housing The body rotatably supports the shaft member; and a conductive portion elastically abuts on the shaft member and electrically connects the shaft member and the housing to form a conductive path.

Furthermore, the housing includes: a main body, which is formed of a conductive material, and has an internal space capable of accommodating the bearing and the conductive part; and a cover, which is provided with a through hole that becomes the opening, and is connected to The body part is engaged to block the internal space, thereby sealing the bearing and the conductive part in the internal space; the body part and the cover part are provided at the screw positions of both They are screwed together to be integrated to form the housing.

In the invention thus constituted, in a state where the bearing supporting the shaft member and the conductive part are housed in the internal space of the main body constituting the housing, the cover part is capped on the main body part and screwed into the cover tightly, thereby the parts The assembly is complete. Therefore, it is extremely easy to assemble compared with the prior art. In addition, the shaft member is free to rotate with respect to the housing. Therefore, by connecting the ground wire to the shaft member, even when the housing and the roller shaft rotate integrally, the ground wire can be suppressed from twisting.

In addition, another aspect of the present invention is a roller conveying device. In order to achieve the second object, the roller conveying device includes: a roller shaft that rotates around a central axis; a roller installed on the roller shaft and the The roller shaft integrally rotates to convey the object to be conveyed in a predetermined conveying direction; the conductive device of the structure is installed at the end of the roller shaft; and the ground wire is connected to the conductive device.

In the invention thus constituted, the substrate can be conveyed in a state where the roller shaft is electrically grounded, so that damage to the substrate by static electricity can be prevented beforehand. [Effects of Invention]

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

Fig. 1 is a diagram showing an embodiment of the present invention. More specifically, (a) of FIG. 1 is a diagram showing the appearance of the first embodiment of the conductive device of the present invention. In addition, (b) of FIG. 1 is a diagram showing the appearance of a part of a roller conveying device equipped with the conductive device. As shown in FIG. 1( a ), the conductive device 1 has a structure in which a shaft member 40 is protrudingly provided on the central axis of a substantially cylindrical housing 100.

The shaft member 40 is free to rotate with respect to the housing 100 around a rotation axis substantially coincident with the central axis of the housing 100. The front end of the shaft member 40 protruding from the housing 100 to the outside is connected to a ground wire 70 via a terminal fitting 71. At the end of the housing 100 on the side opposite to the side where the shaft member 40 is provided, a male screw 11 is formed coaxially with the center axis of the housing 100.

As shown in FIG. 1( b ), the conductive device 1 is installed on the roller conveying device 9. More specifically, the roller conveying device 9 includes: a pair of frames 910 and 910 arranged in parallel; a plurality of roller shafts 920 whose ends are supported by the frames 910 and 910 so as to be rotatable; and each roller shaft 920 A plurality of conveying rollers 930 are respectively provided. As the roller shaft 920 rotates, the substrate (not shown) on the lower surface supported by the transport roller 930 is transported in a predetermined transport direction. The roller shaft 920 is conductive, for example, made of metal, and the transport roller 930 is conductive, for example, made of resin.

The conductive device 1 is respectively installed at one end 921 of each roller shaft 920. That is, an internal thread (not shown) is formed at one end 921 of each roller shaft 920, and the external thread 11 of the conductive device 1 is screwed with the internal thread, thereby mounting the conductive device 1 on the roller shaft 920. The end is electrically connected to the roller shaft 920. The conductive devices 1 respectively attached to the plurality of roller shafts 920 are electrically connected to each other via a ground wire 70, and are finally connected to a predetermined ground electrode to be grounded.

As a result, it is prevented that static electricity is generated on the roller shaft 920 during the transfer of the substrate to cause damage to the substrate. When, for example, the glass substrate is transported by the transport roller 930, the glass substrate, the roller shaft 920, and the transport roller 930 are electrostatically charged due to friction between the glass substrate and the transport roller 930. If there is no conductive device as in the present embodiment, so-called sparks in which the charged static electricity is discharged from the conveyance roller 930 or the roller shaft 920 to the substrate may be generated. The electric potential of the roller shaft 920 is managed by the conductive device 1, for example, electrical grounding, so that such sparks can be prevented.

As the roller shaft 920 rotates, the housing 100 of the conductive device 1 and the roller shaft 920 rotate integrally. On the other hand, the ground wire 70 is mounted on the shaft member 40, and the shaft member 40 is free to rotate around a rotation axis coaxial with the central axis of the housing 100 relative to the housing 100. Therefore, the shaft member 40 does not rotate in the state in which the ground wire 70 is attached, so as to prevent the ground wire 70 from being twisted due 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 4. FIG. 2 is an exploded cross-sectional view showing the internal structure of each component constituting the conductive device, and FIG. 4 is an assembled cross-sectional view of the conductive device. In addition, FIG. 3 is a flowchart showing the assembly procedure 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, a cover 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 substantially axisymmetric. As shown in FIGS. 1 and 2, the conductive device 1 is constructed by assembling these members coaxially.

The housing body 10 is an integral part made of conductive materials, such as metal materials such as stainless steel, brass, aluminum, etc. It is penetrated from the center of the upper end of the substantially cylindrical member to a predetermined depth, and has an upper end. A cylindrical shape with an opening and a closed bottom. As a result, an internal space SP for accommodating various components described later is formed in the housing main body 10. An internal thread 13 is formed on the edge of the upper end opening of the casing body 10.

The spring 20 is a coil spring formed of a conductive and elastic material, such as a metal wire. The outer diameter of the spring 20 becomes a size restricted in the internal space SP of the housing body 10.

The conductive block 30 is a part formed of conductive material, such as metal or carbon (graphite), and has the following structure: A disc-shaped part 31 having a diameter larger than the inner diameter of the spring 20 is connected to the lower part of the disc-shaped part 31 The cylindrical portion 32 has a diameter smaller than the inner diameter of the spring 20. In addition, a recess 33 is provided in the center of the upper surface of the disc-shaped portion 31. The conductive block 30 has the cylindrical portion 32 downward and above the spring 20 housed in the housing body 10. Then, the conductive block 30 is elastically supported by the spring 20 in a form in which the cylindrical portion 32 is inserted into the inside of the spring 20.

The shaft member 40 is a rod-shaped part containing a conductive material, such as a metal material such as stainless steel, brass, aluminum, and the like. The lower portion 41 is partially enlarged in diameter, 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 in such a way that an appropriate fit tolerance is applied to the inner diameter of the bearing 50 so that the two are in a state of clearance fit. As a result, for example, the shaft member 40 can be inserted into the inner ring of the bearing 50 with a slight force.

The cover part 60 is a cylindrical part in which the external thread 61 is provided in the periphery. The external thread 61 becomes a shape to be screwed with the internal thread 13 of the casing body 10, and these threads are screwed to integrate the casing body 10 and the cover 60, thereby constituting the casing 100. The material of the cover 60 is not particularly limited, and for example, the same material as the case body 10 can be used. The inner diameter of the cylindrical portion 62 of the cover 60 is set in such a way that an appropriate fit tolerance is applied to the outer diameter of the bearing 50 so that the two are in a state of clearance fit. Thereby, for example, the bearing 50 can be penetrated with respect to the cover part 60 with a slight force.

On the other hand, the opening diameter of the upper end 63 of the cover 60 is slightly smaller than the outer diameter of the bearing 50. That is, the side wall surface of the cylindrical portion 62 has a structure in which the upper end thereof protrudes toward the inner side (the central axis side). This prevents the bearing 50 housed in the cylindrical portion 62 from flying out above the cover 60. That is, the cover 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. In addition, the upper end of the shaft member 40 rotatably with respect to the housing 100 protrudes from the opening provided in the upper end 63 of the cover 60.

A ground wire 70 is connected to the upper end of the shaft member 40. Specifically, the fixing screw 80 is threadedly engaged with the female thread 44 formed on the upper end portion 43 of the shaft member 40. The fixing screw 80 is screwed to the female thread 44 through the terminal fitting 71 and the washer 90 installed at one end of the ground wire 70, thereby mechanically coupling the terminal fitting 71 to the shaft member 40, thereby connecting the ground wire 70 and The shaft member 40 is electrically connected.

An example of the steps when assembling these components to manufacture the conductive device 1 is shown in FIG. 3. First, it is preferable to house the spring 20 and the conductive block 30 in the internal space SP of the housing body 10 in this order with the opening of the housing body 10 facing upward (step S101 and step S102). In addition, the spring 20 and the conductive block 30 may be housed in the housing body 10 in a state where the spring 20 and the conductive block 30 are combined.

Next, with the shaft member 40 inserted into the bearing 50, they are integrally housed in the housing body 10 (step S103). Then, the cover 60 is placed on the bearing 50, while being pressed into the cover 60 against the biasing force of the spring 20, the cover 60 is screwed into the housing body 10 (step S104).

The left diagram of Fig. 4(a) shows the state at this time. At the time when the cover 60 is covered on the bearing 50, the parts contained in the housing body 10 are suppressed from flying out to the outside. In particular, the lower end of the shaft member 40 is sharp, and a recess 33 is provided on the upper part of the conductive block 30 that bears it. Therefore, the shaft member 40 is prevented from sliding laterally on the conductive block 30 to cause positional deviation. Therefore, the work of screwing the cover 60 and the housing body 10 together is also the work of mounting each component in a regular position. In addition, jigs and tools are not particularly required for the assembly work up to this point. In this way, in the conductive device 1, the assembly work for integrating the components is extremely simple.

Returning to FIG. 3, the conductive device 1 assembled in this way is connected to the ground (step S106, step S107). Prior to this, the conductive device 1 may be engaged with the roller shaft 920 (step S105). That is, there may be a method of engaging the body of the conductive device 1 on the roller shaft 920 and then connecting the ground wire 70, and a method of engaging the conductive device 1 on the roller shaft 920 after the ground wire 70 has been installed (here In this case, step S105 is executed after step S107). These methods can be appropriately selected according to whether the workability on site is good.

The connection of the ground wire 70 can be performed in the following manner. The washer 90 is inserted into the fixing screw 80 (step S106), and the fixing screw 80 is inserted through the mounting hole of the terminal fitting 71 installed at the end of the ground wire 70 and fastened to the female thread 44 of the shaft member 40 (step S107). ), thereby connecting the ground wire 70 to the conductive device 1. At this time, for example, a tool such as a screwdriver is used to fasten the fixing screw 80. However, the shaft member 40 as an installation object is fixed to the larger conductive device 1 or the roller shaft 920, so its support is relatively easy.

The right figure of Fig. 4(a) 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 body 10 via the spring 20, and is urged upward by the restoring force of the spring 20 that has been pressed in. The shaft member 40 is pressed against the upper surface of the conductive block 30, so the shaft member 40 is also urged upward.

The shaft member 40 is inserted through the bearing 50. The enlarged diameter portion 41 of the shaft member 40 touches the lower surface of the bearing 50, thereby restricting the upward movement of the shaft member 40 relative to the bearing 50. In other words, when the shaft member 40 is about to be displaced upward, the bearing 50 is also displaced integrally.

As a result, the spring 20 imparts an upward urging force to the conductive block 30, the shaft member 40, and the bearing 50. Since the upper end of the bearing 50 is displaced by the upper end 63 of the cover 60, the bearing 50 is pressed by the cover 60. Thereby, the position of each part in the up-down direction is fixed, and each part is prevented from shaking greatly in the housing 100.

FIG. 4( b) is a partial cross-sectional view showing the contact state of the shaft member 40, the bearing 50, and the cover 60 in more detail. The bearing 50 is, for example, a ball bearing, and includes an outer ring 51, an inner ring 52, and a rotating body 53 as its main components. The rotating body 53 rotates between the outer ring 51 and the inner ring 52, thereby realizing a relative rotational movement 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 and 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-mentioned relationship. On the other hand, the upper end 63 of the cover 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 of the upper end 63 of the cover 60 is set in such a way that the relationship is satisfied.

Therefore, the upward urging force F of the spring 20 indicated by the hollow arrow has the effect of pressing the shaft member 40 against the inner ring 52 of the bearing 50, thereby preventing displacement between the shaft member 40 and the inner ring 52, and The cover 60 is pressed against the outer ring 51 of the bearing 50, so that no displacement occurs between the cover 60 and the outer ring 51. On the other hand, the outer ring 51 and the inner ring 52 rotate smoothly. As a result, free rotation of the shaft member 40 with respect to the housing 100 is achieved.

The shaft member 40 rotates with respect to the housing 100, whereby the front end of the shaft member 40 slides while touching the conductive block 30. Therefore, the conductive block 30 requires the following properties: good conductivity, low friction coefficient, and high heat resistance. In this embodiment, a carbon (graphite) block is used as a conductive block suitable for this purpose.

As described above, the conductive device 1 of the present embodiment has the function of electrically grounding the roller shaft 920 of the roller conveying device 9. Specifically, a conductive path is formed to reach a ground electrode (not shown) through the housing body 10, the spring 20, the conductive block 30, the shaft member 40, and the ground wire 70 each containing a conductive material, and the generated in the roller shaft 920 is removed. Static electricity. As a result, it is possible to avoid the problem of damage to the substrate being conveyed or the elements formed on the surface thereof due to static electricity, or deterioration of characteristics.

The conductive device 1 can be assembled by a simple operation of covering the lid 60 and screwing in after the main parts are housed in the casing body 10. Therefore, no special jigs and tools are used, and the assembly can be performed with few man-hours.

Hereinafter, other embodiments of the conductive device of the present invention will be described. In these embodiments, compared with the above-mentioned first embodiment, some of the structures are different, but most of the structures are the same. Therefore, members having the same structure and function as those of the first embodiment are assigned the same reference numerals, and detailed descriptions may be omitted.

Fig. 5 is a diagram showing a second embodiment of the conductive device of the present invention. Compared with the first embodiment, in the conductive device 2 of the second embodiment, a part of the structure of the housing is different, and the structure other than this point is the same. Specifically, in the housing body 210 and the cover portion 260 constituting the housing 200, an internal thread 213 is formed on the housing body 210 side, and an external thread 261 is formed on the cover portion 260 side, and the two are screwed to each other. Even with such a structure, the following effects can be obtained in the same way as in the first embodiment: the assembly is simple, and the roller shaft can be reliably grounded.

In addition, in this structure, the inner diameter of the upper part of the housing body 210 can be made to coincide with the outer diameter of the bearing 50, for example. With this setting, in the step of accommodating the bearing 50 in the housing body 210 (step S103) in the assembling step, it is possible to suppress the shaking of the bearing 50 in the lateral direction, and to cover the cover 260 more smoothly. As a result, the workability at the time of assembly is further improved.

Fig. 6 is a diagram showing a third embodiment and a fourth embodiment of the conductive device of the present invention. More specifically, FIG. 6(a) shows the third embodiment of the conductive device of the present invention, and FIG. 6(b) shows the fourth embodiment of the conductive device of the present invention. In the conductive device 3 of the third embodiment shown in (a) of FIG. 6, the spring 320 is arranged above the bearing 50. More specifically, in this embodiment, the conductive block 330 made of carbon is arranged at the bottom of the internal space SP of the casing body 310, and the shaft member 340 is arranged so as to abut on the upper surface of the conductive block 330. The shaft member 340 is housed in the housing body 310 in a state of being inserted into the bearing 50.

After that, the spring 320 is loaded on the bearing 50 and the cover 360 is covered. The opening diameter of the upper end 363 of the cover is smaller than the outer diameter of the spring 320, thereby preventing the spring 320 from flying out. When the cover 360 is screwed to the housing body 310, the spring 320 contracts, and its restoring force urges the bearing 50 downward. As a result, the shaft member 340 rotates while being pressed by the conductive block 330.

In this case, conduction can be achieved between the shaft member 340 and the conductive block 330, and between the conductive block 330 and the housing body 310, respectively, so the spring 320 does not need to be conductive. In addition, as long as there is no problem in wear resistance, the shaft member 340 may be configured to abut against the housing main body 310 without passing through the conductive block.

In addition, in this structure, for example, the inner diameter of the housing main body 310 is set to an inner diameter corresponding to the outer diameter of the bearing 50, so that the lateral vibration when the bearing 50 is housed in the housing main body 310 can be reduced. To the extent that there are no practical problems. Therefore, the spring 320 is further loaded and the cover 360 is tightly closed, so that the conductive device 3 can be assembled, 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 accuracy and facilitate the attachment of the rear cover 360, as shown in the figure, it is preferable to provide an external thread on the housing body 310. , The cover 360 is provided with an internal thread.

In addition, in the conductive device 4 of the fourth embodiment shown in FIG. 6(b), instead of the spring 20 and the conductive block 30 provided in the conductive device 1 of the first embodiment, a material having conductivity and elasticity will be used. For example, a leaf spring 420 formed of phosphor bronze is provided in the housing 400. The leaf spring 420 uses its restoring force to urge the shaft member 40 upward, thereby pressing the shaft member 40 on the bearing 50 and pressing the bearing 50 on the upper end 63 of the cover 60. In addition, the housing main body 410 and the shaft member 40 are respectively abutted to electrically connect them. That is, the leaf spring 420 elastically electrically connects the shaft member 40 and the housing body 410. As a result, the number of parts can be further reduced.

In the conductive device 3 and the conductive device 4 of these embodiments, the roller shaft may be electrically grounded via the conductive device. In addition, the assembling procedure of accommodating the main parts in the casing body and tightening with the cover is also the same as the first embodiment. Therefore, the assembly of the conductive device can be easily performed.

As described above, in the first embodiment, the housing body 10 and the cover 60 respectively function as the "main body" and the "cover" of the present invention, and they are integrated as the "housing" of the present invention. "Play to function. In addition, the shaft member 40 and the bearing 50 respectively function as the "shaft member" and the "bearing" of the present invention. In addition, the spring 20 functions as the "biasing member" of the present invention. On the other hand, the conductive block 30 functions as the "contact member" of the present invention, and they integrally function as the "conductive portion" of the present invention. In addition, the external thread 11 provided in the housing body 10 corresponds to the "engagement portion" of the present invention, and on the other hand, the internal thread 44 provided in the shaft member 40 corresponds to the "connection portion" of the present invention. In addition, the ground wire 70 corresponds to the "ground wire" of the present invention.

In addition, in the third embodiment, the spring 320 functions as the "biasing member" of the present invention. On the other hand, the conductive block 330 functions as the "contact member" of the present invention, and they are integrated as the "appliing member" of the present invention. The conductive part" functions. 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-mentioned embodiment, and various changes can be made in addition to the above-mentioned embodiment as long as it does not deviate from the gist. For example, in the described embodiment, the conductive device 1 and the roller shaft 920 are connected via the external thread 11 provided on the housing body 10. However, the structure for engaging the conductive device with the roller shaft is not limited to this, and other structures can be suitably used.

In addition, for example, in the first to third embodiments, a coil spring is used as a source of applied force, but instead, a leaf spring as used in the fourth embodiment or a conductive Resin material to generate applied force.

In addition, for example, in the first embodiment, the conduction between the conductive block 30 and the housing body 10 is ensured by the spring 20 that generates the applied force, but the structure for generating the applied force and the structure for ensuring the conduction need not be the same. The same composition, they can also be realized by different components.

In addition, for example, in the first embodiment, in order to facilitate the attachment and detachment between the parts, the shaft member 40 and the inner ring 52 of the bearing 50, and the cover 60 and the outer ring 51 of the bearing 50 are both set up. Set to the state of clearance fit. As an alternative, either may be set to a state of intermediate fit or tight fit. For example, when the shaft member and the bearing are tightly fitted, the shaft member and the inner ring are fixed at the time of assembly. Therefore, it is not necessary to provide an enlarged diameter portion on the shaft member.

In addition, the entire case body 10 and the like of the above-described embodiment are formed of a conductive material (for example, metal), but it is not limited to this. That is, it is sufficient to ensure a conductive path connecting the roller shaft and the conductive portion (spring and conductive block), and the portion that does not participate in the conductive path may not have conductivity.

In addition, in the above-mentioned embodiment, even the ground wire 70, the fixing screw 80, and the washer 90 are included in a part of the configuration of the conductive device, but when the conductive device is distributed as a product, it may be These parts (especially the ground wire) are treated as external parts that are not included in the conductive device.

As described above, as described in the specific embodiment, in the conductive device of the present invention, for example, the conductive portion may be formed of a conductive material, having a structure that abuts on the shaft member and is electrically connected to the housing. An abutting member, and an urging member that urges between the shaft member and the abutting member in the approach direction to give a pressing force. According to such a configuration, even in sliding with the abutting member due to the rotation of the shaft member, it is possible to stably ensure electrical conduction.

In this case, for example, the urging member may be an elastic body formed of a conductive material and interposed between the abutting member and the housing. According to this configuration, the urging member has both the function of applying force to the contact member and the function of ensuring conduction, and the number of parts can be reduced.

In addition, for example, the conductive portion may be an elastic body formed of a conductive material and interposed between the shaft member and the housing. According to this configuration, the shaft member and the housing are elastically and electrically connected by the conductive portion, and as described above, it is possible to have both the function of applying force to the shaft member and the function of ensuring conduction.

In addition, for example, the bearing is a radial bearing in which the inner ring and the outer ring are relatively free to rotate around a rotating shaft. The outer ring abuts on the housing, and the shaft member may have a rod-shaped member having a diameter below the inner diameter of the inner ring. One end has a shape with a larger diameter than the inner diameter of the inner ring, and the one end is inserted into the inner ring so that the one end is located in the housing and the other end opposite to the one end is located outside the housing. According to such a structure, the positional relationship of each part is defined by the contact of the housing and the shaft member with the bearing, and the shaft member can be smoothly rotated with respect to the housing.

In addition, for example, a portion of the shaft member exposed to the outside of the housing may be provided with a connection site for connecting a ground wire. According to this configuration, even if the housing rotates with the rotation of the roller shaft, the rotation of the shaft member connected to the ground wire can be avoided. Therefore, there is no twisting of the ground wire or obstruction of the rotation of the roller shaft due to the connection of the ground wire. Happening. [Industrial availability]

The present invention can be suitably applied to applications constituting a roller conveying device that conveys various substrates such as glass substrates and electronic circuit boards.

1, 2, 3, 4: conductive device 9: Roller conveyor 10, 210, 310, 410: shell body (body part, shell) 11: External thread (locking part) 13, 213: internal thread 20, 320: Spring (forcing member, conductive part) 30, 330: Conductive block (contact member, conductive part) 31: Disc-shaped parts 32: Cylindrical part 33: recess 40, 340: Shaft member 41: Lower part (expanded diameter part) 42: lower end face 43: upper end 44: Internal thread (connection part) 50: Bearing 51: Outer ring 52: inner circle 53: rotating body 60, 260, 360: cover part (shell) 61, 261: external thread 62: cylindrical part 63: upper end 70: Ground wire (ground wire) 71: terminal connector 80: fixing screw 90: Washer 100, 200, 300, 400: shell 363: cover upper end 420: Leaf spring (elastic body) 910: Frame 920: Roller 921: one of the ends 930: Conveying roller (roller) F: Applied force SP: Internal space S101～S107: steps

Fig. 1 is a diagram showing an embodiment of the present invention. Fig. 2 is an exploded cross-sectional view showing the internal structure of each component constituting the conductive device. Fig. 3 is a flowchart showing the assembly procedure of the conductive device. Fig. 4 is an assembled cross-sectional view of the conductive device. Fig. 5 is a diagram showing a second embodiment of the conductive device of the present invention. Fig. 6 is a diagram showing a third embodiment and a fourth embodiment of the conductive device of the present invention.

1: Conductive device

10: Shell body (body part, shell)

11: External thread (locking part)

13: Internal thread

20: Spring (forcing member, conductive part)

30: Conductive block (contact member, conductive part)

31: Disc-shaped parts

32: Cylindrical part

33: recess

40: Shaft member

41: Lower part (expanded diameter part)

42: lower end face

43: upper end

44: Internal thread (connection part)

50: Bearing

60: Lid (housing)

61: External thread

62: cylindrical part

63: upper end

70: Ground wire (ground wire)

71: terminal connector

80: fixing screw

90: Washer

SP: Internal space

Claims (7)

A conductive device is a conductive device used to electrically connect the roller shaft of a roller conveying device with a ground wire, and includes: The housing has a clamping part that is clamped at the end of the roller shaft; The shaft member is formed of a conductive material and protrudes from the inside of the housing to the outside through an opening provided in the housing; A bearing, in the housing, rotatably supports the shaft member with respect to the housing; and A conductive part elastically abuts against the shaft member and electrically connects the shaft member and the housing to form a conductive path; The housing includes: The main body part is formed of a conductive material and has an internal space capable of accommodating the bearing and the conductive part; and The cover part is provided with a through hole that becomes the opening, and is engaged with the body part to block the internal space, thereby sealing the bearing and the conductive part in the internal space; The main body part and the cover part are integrated by screwing the screw parts provided at both to form the housing. The conductive device according to claim 1, wherein The conductive part has: The abutting member is formed of a conductive material, abuts on the shaft member, and is electrically connected to the housing; and The urging member urges between the shaft member and the abutting member in the approaching direction to provide a pressing force. The conductive device according to claim 2, wherein the urging member is formed of a conductive material and is an elastic body interposed between the abutting member and the housing. The conductive device according to claim 3, wherein the conductive portion is formed of a conductive material and is an elastic body interposed between the shaft member and the housing. The conductive device according to any one of claims 1 to 4, wherein the bearing is a radial bearing in which an inner ring and an outer ring are relatively free to rotate around a rotating shaft, and the outer ring abuts on the case, The shaft member has a shape in which one end is enlarged compared to the inner diameter of the inner ring, and the one end is an end of a rod-shaped member having a diameter less than the inner diameter of the inner ring, and The one end portion is located in the housing, and the other end portion opposite to the one end portion is inserted into the inner ring in a state where the other end portion is located outside the housing. The conductive device according to any one of claims 1 to 5, wherein a portion of the shaft member exposed to the outside of the housing has a connection portion for connecting the ground wire. A roller conveying device includes: The roller shaft rotates around the central axis; A roller is installed on the roller shaft and rotates integrally with the roller shaft to convey the object to be conveyed in a predetermined conveying direction; The conductive device according to any one of claims 1 to 6, installed at the end of the roller shaft; and The ground wire is connected to the conductive device.

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