JPH1163164A - Motive power transmission device and roller conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motive power transmission device and a roller conveyor by which dust is hardly generated with simple constitution. SOLUTION: As a motive power transmission device 4 to transmit motive power to a roller from a main shaft 41, a circular plate-shaped driving disc 5 where plural magnetic poles are formed in an outer peripheral part 51 and a circular plate-shaped passive disc 6 where plural magnetic poles are similarly formed in an outer peripheral part, are combined with each other in a noncontact condition where the respective outer peripheral parts 51 and 61 approach each other. Therefore, since rotational motive power of the main shaft 1 can be transmitted to a shaft 31 to drive the roller in a noncontact condition, a roller conveyor by which a dust generating property is hardly caused and a noise is also reduced, can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device capable of transmitting a rotational driving force, and a roller conveyor using the power transmission device.

[0002]

2. Description of the Related Art As a power transmission device for transmitting a driving force of an electric motor or the like via a rotating means such as a shaft, there is a wheel train using gears or a combination of a pulley and a belt. Such a power transmission device is also used for a conveyor that moves articles in a predetermined direction. In a roller conveyor that transports articles at a constant speed by arranging a plurality of rollers on the left and right in the moving direction and rotating these rollers in synchronization, a common power is used to rotationally drive the transport rollers. A main shaft is driven by a motor or the like serving as a source, and power is distributed from the main shaft to each roller using a power transmission device such as a train wheel or a belt.

[0003]

Electrical parts such as semiconductor substrates, ultra-precision parts for optical devices and the like, as well as foods and the like, for which it is desirable to avoid the attachment of dust, are dust and dirt such as clean rooms. A device that is manufactured in an area where generation is controlled and that has low dust generation even in a manufacturing device, or a device having a sealed structure that prevents dust from leaking out of the device is used. The same applies to the roller conveyor that conveys articles, so that the gear train arranged along the main shaft is almost sealed so that dust etc. is not released from the mechanism that distributes power from the main shaft for power transmission to each roller The housing has a rigid structure that can be used.

However, roller conveyors for transporting articles extend to various places, and the total length thereof is very long. Since dust-producing mechanisms, such as gears and drive belts, are installed for each roller, in order to cover all these mechanisms and prevent the generation of dust, etc. Alternatively, the case needs to be provided along the entire length of the roller conveyor. For this reason, since a long case is provided along the roller conveyor, the size of the roller conveyor increases, and the manufacturing and installation costs also increase. Further, a dust-producing mechanism using a gear or a drive belt generates high noise, and a case that also serves to prevent noise is used. For this reason, the manufacturing cost of the roller conveyor further increases. In addition, in order to maintain the performance of the transmission mechanism such as the gears and the drive belt, maintenance such as lubrication is important. However, if the transmission mechanism is covered with a highly sealed case, it is difficult to perform maintenance work.

Accordingly, an object of the present invention is to provide a power transmission device having a simple configuration suitable for a roller conveyor or the like used in a clean room and having very little dust generation. Another object of the present invention is to provide a power transmission device with extremely low dust generation that can be used in a dust-proof or dust-removed area such as a clean room without being covered with a highly sealed case. It is another object of the present invention to provide a power transmission device with low noise. And, by realizing a roller conveyor that can distribute power to the rollers by using such a power transmission device that has almost no dust generation, it is possible to omit a sealed case that covers the distribution mechanism, and it is inexpensive and has good maintenance properties. It is an object of the present invention to provide a roller conveyor suitable for transporting electric parts, precision parts, and the like.

[0006]

For this reason, in the present invention, a magnetized power transmission member is used, paying attention to the fact that dust or noise is caused by contact points between gears or between a belt and a pulley. Thus, a non-contact type power transmission device is realized, and a power transmission device having no dust generation and capable of greatly reducing noise is provided. That is, the power transmission device of the present invention includes a rotatable and disk-shaped active member having a plurality of magnetic poles formed on an outer peripheral portion, and a disk-shaped passive member having a plurality of magnetic poles formed on an outer peripheral portion. An outer peripheral portion of the passive member is disposed near an outer peripheral portion of the active member.

In the power transmission device of the present invention, the multi-polarized active member having a plurality of magnetic poles and the passive member are arranged close to each other. The magnetic field also rotates with this, and the passive member also rotates with the fluctuation of the magnetic field. Therefore, in the power transmission device of the present invention, the power of the active member is transmitted to the passive member via the magnetic field, and the rotational driving force can be transmitted to the passive member in a state where the active member and the passive member are not in contact with each other. For this reason, the active member and the passive member do not mechanically come into contact with each other, such as a gear train using a gear train or a transmission device such as a belt and a pulley, so that wear and noise do not occur. Further, a power transmission device with low noise can be provided.

As described above, since the power transmission device of the present invention hardly generates dust and noise from itself, it is not necessary to cover the power transmission device with a sealing or soundproof cover or case. Therefore, if this power transmission device is employed for a mechanism for transmitting and distributing power from a driving force transmission shaft arranged along the moving direction of the roller conveyor to the transport roller, dust generation along the roller conveyor is achieved. The effect of soundproofing and dust generation can be obtained without providing a case for prevention or soundproofing. For this reason, it is possible to provide a roller conveyor that has little dust generation, is small and lightweight, and can be manufactured at low cost, and can be used in a clean room or the like.

[0009] Further, since there is no need to provide a sealable case along the roller conveyor, maintenance is improved. Further, since the power transmission device is non-contact, maintenance such as injection of lubricating oil is not required, and a power transmission device and a roller conveyor that are almost maintenance-free can be realized.

In the power transmission device of the present invention, the directions of the active member and the passive member are not limited, and they may be arranged so that their respective axial directions are parallel to each other. It is also possible to change the direction of power transmission by disposing them so that their axial directions are orthogonal to each other. The power transmission device in which the axial direction of the active member and the passive member is orthogonal to each other is suitable as the power transmission device of the roller conveyor that transmits the power of the main shaft to the individual rollers. In such an arrangement, one of the active member and the passive member is magnetized in the axial direction, and the other is magnetized in the direction perpendicular to the axial direction, so that one of the disk-shaped members has the other side surface (end surface). The power transmission device is compact and has a high power transmission efficiency.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a power transmission device and a roller conveyor according to the present invention will be described with reference to the drawings. FIG.
1 shows a schematic configuration of the roller conveyor of the present invention. In the roller conveyor 1 of the present invention, the moving direction of the article (arrow H)
Guide rails 21 and 22 extending substantially parallel to
And a plurality of rollers 3 rotatably supported by the guide rails 21 and 22. The rollers 3 are arranged at opposing positions inside the respective guide rails 21 and 22 so that articles conveyed by these rollers 3, for example, both edges of the printed circuit board 8 can be uniformly supported. I have. Power transmission main shafts 41 and 42 extend along the outer sides of the respective guide rails 21 and 22. Further, a plurality of power transmission mechanisms 4 for transmitting power from these main shafts 41 and 42 to the roller 3 respectively. Are arranged outside the guide rails 21 and 22. For this reason, the plurality of rollers 3 provided on the rails 21 and 22 rotate at a speed substantially synchronized by the driving force of the motor 7 for driving the main shafts 41 and 42, and the printed circuit board supported by these rollers 3 8
And the like can be smoothly transported in a predetermined direction at a predetermined speed.

FIG. 2 shows an enlarged view of a power transmission device 4 for transmitting power from the main shaft 41 or 42 to each roller 3, and FIG. 3 shows one of the power transmission devices 4 of this embodiment.
Are shown enlarged. The power transmission device 4 of the present embodiment includes a drive disk 5 which is a disk-shaped active member attached to the drive main shafts 41 and 42, and a disk-shaped passive member connected to the individual rollers 3 and the roller shaft 31. A passive disk 6 is provided, and an appropriate clearance (gap) is provided in the vicinity of the outer peripheral portion 51 of the drive disk 5 so that the outer peripheral portion 61 of the passive disk 6 is almost in contact with the drive disk 5.

Main shafts 41 and 42 for driving
Is the bearing 2 outside the guide rails 21 and 22
The main shaft 41 has a pulley 43 and a belt 44.
The motor 7 which is a power generation source is connected via the.
The power transmitted by the main shaft 41 is transmitted to the individual rollers 3 by the power transmission device 4, and at the opposite side via a transmission shaft 47 installed between the guide rails 21 and 22 at the end of the frame 2. Is also transmitted to the main shaft 42. The transmission shaft 47 is
Bevel gear 45 housed in a dustproof sealed case 48
And 46 are mechanically connected to the respective main shafts 41 and 42 so that the driving force of the motor 7 is reliably transmitted to the opposite main shaft 42. For this reason, the main shafts 41 and 4
2 are synchronously driven to rotate at the same speed, and the rollers 3 to which power is distributed from the main shafts 41 and 42 by the power transmission device 4 are also synchronously driven to rotate at substantially the same speed.

The individual rollers 3 are supported by an inner end 32 of a roller shaft 31 which passes through the guide rail 21 and can be freely rotated by bearings 23, and the passive disk 6 is mounted on the outer end 33 of the roller shaft 31. Have been. Therefore, the roller 3 can be driven to rotate by the passive disk 6 of the power transmission device 4. The drive disk 5 and the passive disk 6 of the power transmission device 4 have a disk shape with an appropriate thickness and a flat axial side surface (end surface), as shown in an enlarged view in FIG.
Ring-shaped permanent magnets (magnet rings) 55 and 65 are provided on the outer peripheral portions 51 and 61, respectively, and a plurality of magnetic poles (N pole and S pole) are formed along the outer periphery. In the power transmission device 4 of the present example, the drive disk 5 fixed to the main shaft 41 or
Ring 5 magnetized in the direction of arrow A along
A plurality of magnetic poles appear on both end surfaces 52 of the disk 5, and a multipolar magnetized drive disk is formed along the outer peripheral portion 51. On the other hand, the passive disk 6 is provided with a magnet ring 65 magnetized in its axial direction, that is, in the direction of arrow B perpendicular to the roller shaft 31, and a plurality of magnetic poles (N poles) And the S pole) appear, and the multi-pole magnetized passive disk 6 is formed along the outer peripheral portion 61.

In the power transmission device 4 of this embodiment, the drive disk 5 and the passive disk 6 having a plurality of magnetic poles formed on the outer peripheral portions 51 and 61 are arranged in a state of being orthogonal to each other, and the main shafts 41 and 42 are provided. Can be transmitted to the roller shafts 31 different by 90 °. Further, in the power transmission device 4 of this example, the respective disks 5 and 6 are arranged such that the outer peripheral side surface 63 of the passive disk 6 faces the end surface 52 of the drive disk 5. Therefore, the magnetic pole formed on the outer peripheral surface 63 of the passive disk 6 faces the magnetic pole on the end face 52 of the drive disk 5 with a slight gap (gap, clearance). Therefore, when the drive disk 5 moves and the magnetic pole of the end face 52 moves, the change (movement) of the magnetic field or the change of the magnetic force can be received extremely efficiently by the magnetic pole of the outer peripheral surface 63 of the passive disk 6. The non-contact type power transmission device 4 with high transmission efficiency that converts the rotational force or power of the motor 5 into the rotation of the passive disk 6 via a magnetic field or magnetic force or transmits the power as power can be realized.

As described above, the power transmission device 4 of the present embodiment realizes a non-contact power transmission mechanism by transmitting power using the plurality of disks 5 and 6 having a plurality of magnetic poles formed on the outer peripheral portion. doing. Therefore, there is no problem of generation of wear and noise due to the contact of the members, the dust generation is extremely small,
A power transmission device with low noise can be provided. In addition, since there is no wear due to non-contact, there is almost no need for maintenance such as deterioration of transmission members, adjustment of gaps between members, replacement of parts, and periodic work such as lubricating oil injection is also unnecessary. A free power transmission device can be provided.

The drive disk 5 and the passive disk 6 can be rotated synchronously by installing the drive disk 5 and the passive disk 6 with an appropriate clearance sufficiently affected by the magnetic field. Power can be transmitted with little loss. For example, when the drive shaft 41 or 42 is rotated in the clockwise direction C, the rotational drive force is transmitted by the drive disk 5 and the passive disk 6, and the rotor shaft 31 can be rotated in the counterclockwise direction D. Further, the drive disk 5 and the passive disk 6
The same function as a contact type power transmission device using gears, belts, pulleys, etc. can be added, such as changing the diameter of the gears or changing the number of magnetic poles formed on each outer periphery to change the speed ratio. Of course it is possible. Also,
Not only two disks but also three or more disks can be used to construct a non-contact power transmission mechanism having the same function as the wheel train.

In addition, since the power transmission device 4 of the present embodiment is of a non-contact type, even if one disk is stopped for some reason, the other disk rotates if an appropriate force is applied. For example, if any of the rotors 3 is stuck for some reason and does not move, the passive disk 6 does not rotate, but the drive disk 5 can rotate. For this reason,
Even if the drive disk 5 rotates, the mechanism of the power transmission device 4 is not destroyed and the main shaft 41 or 42
Power can be transmitted to another rotor 3 via the. Then, as soon as the cause of the stuck rotor 3 that has stopped is removed, the rotor 3 can be restored. Of course, the reverse is also possible. Even if the driving motor 7 stops for some reason and the drive disk 5 does not rotate, the articles are conveyed while rotating the rotor 3 connected to the passive disk 6 independently of this. can do. further,
The rotation speed of the rotor 3 can be adjusted irrespective of the rotation speed of the main shafts 41 and 42 even when an operator manually stops the article being conveyed or accelerates the operation. As described above, the power transmission device of the present example is capable of extremely flexible movement, and is capable of following an abnormal situation, a protective functional movement against an abnormal load, or an intentional operation. Operation can be realized. The point (load, load point) at which the rotor or shaft appropriately rotates in response to such asynchronous movement can be freely adjusted by the strength of the magnetic poles of the disks 5 and 6 and the clearance of the disks 5 and 6.

In the roller conveyor 1 of this embodiment in which power is distributed to the respective rollers 3 by such a power transmission device 4, the main shaft 41 is moved by the motor 7 to the arrow C.
, The drive disk 5 of each power transmission device 4 rotates, and the passive disk 6 is driven following the rotation, whereby the roller 3 rotates in the direction of arrow D. Further, the opposite main shaft 42 is also rotationally driven by the motor 7 in the direction of the arrow F via the transmission shaft 47, and accordingly, the opposite roller is connected via the respective power transmission devices 4 provided on the main shaft 42. 3 rotates in the direction of arrow G. Therefore, the rollers 3 on both sides rotate in the same direction in synchronization, and the precision components and the printed circuit board 8 can be conveyed in the direction of arrow H by the rollers 3.

Since each power transmission device 4 of this embodiment is of a non-contact type using magnetism, when driving each roller 3, there is almost no dust generation from the power transmission device 4 and the power transmission device Even if the housing 4 is not housed in a hermetically sealed housing (case), it can be used for transporting dust-resistant precision parts and electric parts. In the roller conveyor, a mechanism for transmitting power from the main shaft to each roller 3 is arranged along the traveling direction. For this reason, if a contact-type power transmission device such as a gear is used, a dust-generating mechanism will be arranged along a path that passes during transportation, so that the entirety is formed by a highly dust-proof sealing housing. You have to cover it, which requires great effort and cost. On the other hand, in the case of the conveyor of this example, since the power transmission device itself hardly generates dust, no dust prevention measures are required, and labor and cost for manufacturing the roller conveyor can be saved. Further, since a factor of dust generation along the roller conveyor can be fundamentally eliminated, a very clean roller conveyor can be provided, and a roller conveyor suitable for transportation in a clean room can be provided. .

At the same time, since the power transmission device 4 of this embodiment is non-contact, it generates very little noise and can realize an extremely quiet roller conveyor. In addition, since a sealable cover is not required, a roller conveyor that facilitates inspection and maintenance of the power transmission device can be provided. Further, since the power transmission portion is non-contact, the maintenance itself is almost unnecessary.

In the roller conveyor 1 of the present embodiment, a mechanism for transmitting power from the main shaft 41 to the other main shaft 42 employs a mechanical transmission device using bevel gears 45 and 46. Is covered by a highly sealed case 48. For the power transmission between the main shafts, a mechanical type that has a very high transmission efficiency and does not run idle is suitable, and the part that transmits the power between the main shafts is much less than the roller, so it is like this The cost does not increase even if a suitable transmission method is adopted. Also, the source of dust is very small in area as compared with the entire length of the roller conveyor, so that the influence on the conveyed product is very small. Of course, it is also possible to use a non-contact type transmission device 4 for rollers in these transmission devices.

In the above, the present invention has been described by taking as an example a power transmission device having a configuration in which a drive disk 5 and a passive disk 6 suitable as the power transmission device 4 for the rollers of the roller conveyor 1 are arranged in a direction orthogonal to each other. I have. In the power transmission device in which the drive disk 5 and the passive disk 6 are arranged in the 90 ° direction, a disk that is magnetized in the axial direction is used as the passive disk 6, and the drive disk 5 is magnetized in parallel with the end face. The outer peripheral surface 5 of the drive disk 5 is
Of course, it is also possible to combine 3 with the end face 62 of the passive disk 6 facing. Also, to provide a non-contact type power transmission device having a function of increasing or decreasing the speed by combining disks having different diameters or the number of poles in parallel in addition to a function of changing a rotation direction from a main shaft to a roller direction. Of course, it is possible. Furthermore, in this example,
Although a plurality of magnetic poles are formed on the outer periphery of the disk using a ring-shaped magnetic material, a plurality of magnets may be embedded in the outer periphery of the disk in an appropriate direction and at an interval, or may be attached to the outer periphery of the disk. Can be formed with a plurality of magnetic poles. By combining such disks, a non-contact power transmission device similar to the above can be formed.

Further, the power generation source of the roller conveyor is not limited to an electric motor, but an electric type is preferable in consideration of dust generation. Further, the number and the installation position of the main shaft, the number and the shape of the rollers, and the like are merely examples, and are not limited to the present example.

[0025]

As described above, according to the power transmission device of the present invention, a disk-shaped member having a plurality of magnetic poles formed on the outer periphery is combined in a non-contact state to transmit power via magnetism (magnetic field). Communication is possible. For this reason, the power transmission device of the present invention can substantially prevent the generation of dust with a simple configuration, and by adopting this power transmission device as a mechanism for distributing power to each roller of the roller conveyor, precision can be improved. It is possible to provide a low-cost, non-dust-generating, and low-noise roller conveyor suitable for transporting dust-sensitive articles such as components and electric components.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a roller conveyor according to an embodiment of the present invention.

FIG. 2 is an enlarged view showing a part of the roller conveyor shown in FIG.

FIG. 3 is an enlarged schematic view of the power transmission device shown in FIG. 2;

[Explanation of symbols]

 Reference Signs List 1 roller conveyor 2 frame 3 roller 4 power transmission device 5 drive disk 6 passive disk 7 motor 8 printed circuit board 21, 22 guide rail 23, 24 bearing 31 roller shaft 41, 42 drive shaft (main shaft) 45, 46 bevel gear 47 Transmission shaft 48 Dustproof case 51 Outer peripheral portion of drive disk 52 End face of drive disk 61 Outer peripheral portion of passive disk 63 Outer peripheral side surface of passive disk

Claims (5)

[Claims] 1. A rotatable disk-shaped active member having a plurality of magnetic poles formed on an outer peripheral portion thereof, and a disk-shaped passive member having a plurality of magnetic poles formed on an outer peripheral portion thereof. A power transmission device, wherein an outer peripheral portion is disposed near an outer peripheral portion of the active member. 2. The power transmission device according to claim 1, wherein an axial direction of the active member and an axial direction of the passive member are arranged to be orthogonal to each other. 3. The power transmission according to claim 2, wherein one of the active member and the passive member is magnetized in an axial direction, and the other is magnetized in a direction perpendicular to the axial direction. apparatus. 4. A roller conveyor in which a plurality of rollers rotatable in the moving direction of an article are arranged along the moving direction, a driving force transmitting shaft arranged along the moving direction, and an outer peripheral portion. A disk-shaped active member rotatably driven by the shaft having a plurality of magnetic poles formed thereon, and a disk-shaped passive member rotatably driving the roller having a plurality of magnetic poles formed on an outer peripheral portion thereof. A roller conveyor, wherein an outer peripheral portion of a passive member is disposed near an outer peripheral portion of the active member, and an axial direction of the active member is orthogonal to an axial direction of the passive member. 5. The roller conveyor according to claim 4, wherein one of the active member and the passive member is magnetized in an axial direction, and the other is magnetized in a direction perpendicular to the axial direction. .