JPH0940129A - Roller conveyer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller conveyer which can prevent a gear from jumping between a drive belt and respective drive pulleys, and convey an article to be conveyed at a high speed while decreasing a transmission loss. SOLUTION: This roller conveyer is provided with a conveyance roller 5 which is rotatingly-mounted between a pair of frames 3, 4, drive pulleys 8 which are fitted on both sides of the conveyance roller 5 and have gears 9A, and a driving belt 20 engaged by engaging one of the gears with the drive pulley. The frames 3, 4 are provided with a pair of plate-shaped members 55, 55 facing the drive belt 20 with a prescribed clearance T taken. The prescribed clearance T between the drive belt 20 and the plate-shaped member 55 absorbs the deflection amount of the respective drive pulleys 8 deflected to the plate-shaped members 55, 55 side by the dead weight of a conveyed article 2 which is conveyed on the conveyance roller 5, and the drive belt 20 is set to such a clearance as to permit the respective plate-shaped members 55, 55 to be pressed and engaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller conveyor that conveys an object by rotationally driving a plurality of conveying rollers arranged in parallel between a pair of frames.

[0002]

2. Description of the Related Art As conventional roller conveyors, there are those shown in FIGS. 8 and 9, which will be described below.
8 and 9, 1 is a roller conveyor,
It has a pair of frames 3 and 4 which are spaced from each other and extend in the transport direction of the transported object 2, and a plurality of transport rollers 5, 5, 5, ... Are arranged between the frames 3 and 4. Has been done. The transport rollers 5, 5, 5, ...
And a roller body 6 that extends between
And the shaft portions 7 protruding in the axial direction from both ends of
The shafts 7, 7 are rotatably supported by the frames 3, 4 via bearings 3A, 4A so as to be arranged side by side in the extending direction of the frames 3, 4. In addition, each roller 5, 5, 5,
The drive pulleys 8, 8,
.. are attached, and as shown in FIG. 10, each of the drive pulleys 8, 8, 8, ... Has a plurality of tooth portions 9A and a groove portion 9B continuously formed on the outer periphery thereof at a predetermined pitch. An uneven shape 9 is formed. The metal annular chains 10 and 10 are externally fitted / suspended so as to engage with the concave-convex shape 9 across the drive pulleys 8, 8, 8, .... Then, the annular chains 10 and 10 are circularly moved while being guided by the transmission pulleys 12 and 13 by the rotation of the transmission pulley 14A of the drive motor 14 of the drive mechanism 11, and the respective drive pulleys 8, 8, 8, ... By transmitting the driving force to each of the transport rollers 5, 5, 5, 5, ... To transport (linearly move) the transported object 2 on each of the transport rollers 5, 5, 5 ,. , Carry to a predetermined destination. In addition, 1
Reference numerals 5 and 15 denote support frame members that support the pair of frames 3 and 4 on the ground or the like (not shown).

By the way, in the conventional roller conveyor 1, since the annular chains 10 and 10 for transmitting the driving force to the respective drive pulleys 8, 8, 8, ... Are made of metal, the respective drive pulleys 8, 8 are , 8, ..., The driving resistance becomes large due to contact with the rollers, etc., so that there is a problem that high speed conveyance cannot be performed and noise is generated. Also, the annular chains 10, 10
From the viewpoint of rust prevention of the above, regular lubrication maintenance is required, and when the annular chains 10 and 10 circulate, the lubricating oil and the like applied to the annular chains 10 and 10 scatters around and the transported objects are conveyed. 2 or roller conveyor 1
There was a problem that the area around was dirty.

In order to solve such a problem, FIG.
As shown in FIG. 1, instead of the conventionally used annular chain, the drive belts 20, 20 made of a non-lubricating material such as rubber or resin agent are spread over the respective drive pulleys 8, 8, 8 ,. A roller conveyer 25 is used to carry out a product to a predetermined destination in a clean environment by external fitting and suspension.
Further, in order to enable high speed conveyance by the roller conveyor 25, the drive belts 20, 20 are provided with respective drive pulleys 8,
A plurality of tooth portions 21 that mesh with the uneven shape 9 of 8, 8, ...
In addition to forming the concavo-convex shape 21 in which A and the groove portion 21B are continuous, only one tooth portion 21A of the plurality of tooth portions 21A of the drive belts 20, 20 is driven by each of the drive pulleys 8, 8, 8 ,.
Engages with the groove 9B of the drive pulley 8 (or each drive pulley 8,
.. so that only one tooth portion 9A of the conveyor belt 8 meshes with the groove portion 21B of the conveyor belt 20), and the drive resistance between the respective drive pulleys 8, 8, 8 ,. It is done with less.

However, when high-speed conveyance is performed using the drive belts 20 and 20, when the drive motor 14 gives a rapid load variation to the drive belts 20 and 20, the drive pulleys 8, 8, 8, ...・ Driving belt 2 in groove 9B
The tooth portions 21A of 0 and 20 jump over without meshing, that is, tooth jumping of the tooth portion 21A (or tooth portion 9A) occurs, and the transmission of the driving force by the transport belts 20 and 20 is smoothly performed in each drive pulley 8. , 8, 8, ... Is not transmitted, and eventually there is a problem that the high speed conveyance of the conveyed object 2 cannot be performed by the drive belts 20, 20.

In order to solve this problem, the inventor of the present invention has proposed a roller conveyor 30 as shown in FIG. 12 and tried to prevent the tooth portions 9A and 21A from jumping over. In FIG. 12, a roller conveyor 30 is a drive belt 20 for each drive pulley 8, 8, 8 ,.
20 in which the manner of external fitting / suspension is changed, and the drive pulley 8 located at a predetermined position among the drive pulleys 8, 8, 8, ... Which are arranged along the extending direction of the pair of frames 3, 4. , 8, 8, ... Are replaced with idler pulleys (hereinafter referred to as ID pulleys) 31, 31 ,. That is, the ID pulleys 31, 31, 31, ...
Has a flat outer peripheral surface with no unevenness formed on its outer periphery, and is sequentially arranged so that the two drive pulleys 8, 8 are interposed from one end side of the pair of frames 3, 4. ing. The drive belts 20 and 20 are engaged with the drive pulleys 8, 8, 8, ... In a concave-convex manner from above, and the ID pulleys 31, 31, 31 ,. .. and the transmission pulleys 31, 31, 31, ..
13, the drive belts 20, 20 and the drive pulleys 8, 8, 8, ... 9B (or 3
Each of the drive pulleys 8 of the drive belts 20 and 20 is formed so as to mesh with the tooth portion 9A and the groove portion 21B).
The winding angle around 8, 8, ... Is ensured. As a result, when the drive belts 20, 20 are circularly moved, the drive belts 20, 20 and the drive pulleys 8, 8,
It is possible to surely engage the concave and convex portions with 8 ..., and prevent the tooth portion 21A (or the tooth portion 9A) from jumping over.

[0007]

However, as shown in FIG.
In the case of using the ID pulleys 31, 31, 31, ... As shown in FIG. 5, the driving belts 20, 20 have a large driving force due to bending loss with the ID pulleys 31, 31, 31 ,. Is consumed, and each drive pulley 8, 8, 8, ...
・ Power transmission loss to increases. Also, the drive belt 2
When high speed conveyance of the conveyed object is performed in a state where 0 and 20 are bent, bending fatigue is accelerated and the cutting life of the drive belts 20 and 20 is shortened.

The present invention has been made in order to solve such a problem, and prevents the tooth portions of the conveyor belt and the drive pulleys from jumping over and reduces power transmission loss, while at the same time transporting a conveyed object at high speed. It is an object to provide a roller conveyor that can be transported.

[0009]

In order to solve the above problems, in the roller conveyor of the present invention, in claim 1, a pair of frames extending in the transport direction of the transported object are rotatably arranged side by side via a shaft portion. A plurality of transport rollers, drive pulleys attached to both ends of the shafts of the transport rollers projecting from the frames, and formed with a concavo-convex shape having a plurality of teeth at a predetermined pitch on the outer periphery, and the drive pulleys. An annular drive belt in which a concavo-convex shape having a plurality of tooth portions meshing with each other is formed and one drive tooth portion of the plurality of tooth portions is engaged with each drive pulley, and the annular drive belt is circulated and moved. A driving mechanism for transmitting a driving force to each of the driving pulleys, and a plate-shaped member facing each of the frames with a predetermined gap to the driving belt on the side meshing with the driving pulley. The predetermined gap between the drive belt and the plate-shaped member is flexed and deformed toward each plate-shaped member via each of the transfer rollers by the own weight of the transfer object transferred on each of the transfer rollers. The amount of flexural deformation of each drive pulley is absorbed, and the drive belt is set to a gap value that enables press engagement with each plate member.

According to a second aspect of the present invention, according to the first aspect, at least one of the drive belt and the plate-shaped member is pressed and engaged between the drive belt and the plate-shaped member by the circular movement of the drive belt. It has a friction reducing function of reducing the friction generated by.

According to a third aspect of the present invention, a plurality of conveying rollers rotatably arranged side by side through a shaft between a pair of frames extending in the conveying direction of the conveyed object, and an extension of each frame arranged in parallel with each frame. A pair of support members extending in the present direction, drive pulleys attached to both ends of the shafts of the respective conveying rollers projecting from the respective frames, and having a concavo-convex shape having a plurality of teeth at a predetermined pitch on the outer periphery, An annular drive belt is formed that has a plurality of teeth that mesh with the drive pulley and that is suspended above each of the support members with the uneven shape facing upward, and the annular drive belt is circulated to move to drive each drive. A driving mechanism for transmitting a driving force to a pulley, wherein each driving pulley is arranged such that one tooth portion of the plurality of tooth portions of each driving pulley is meshed with the driving belt. A.

In a fourth aspect of the present invention, according to the third aspect, at least one of the respective support members and the drive belt is generated between the drive belt and the respective support members due to the circulating movement of the drive belt. It has a friction reducing function of reducing the friction that occurs.

As described above, according to the roller conveyor of the present invention, in claim 1, only the drive pulley of the conveying roller, through which the conveyed object passes, is moved by the weight of the conveyed object. The driving belt in the vicinity of the driving pulley, which is flexibly deformed, is pressed into engagement with each plate-shaped member provided in each frame, and the driving belt and the driving pulley are sequentially deformed while absorbing a predetermined gap on the member side. Since it is possible to closely mesh one tooth portion with the tooth portion, it is possible to prevent the tooth portion from jumping over even if a sudden load change is transmitted to the drive belt. Further, the drive belt comes into contact with each plate-like member only in the vicinity of the drive pulley that is bent and deformed by its own weight due to the passage of the conveyed object, and the other drive pulley portion through which the conveyed object does not pass is in the unloaded state of each plate. Since each driving pulley and the driving belt are meshed with each other by one tooth without contacting the member, the power transmission loss of the driving force of the driving mechanism is minimized and the deterioration of the driving belt is also minimized. It becomes possible. As a result, while preventing the jumping of the tooth portion of the drive belt and each drive pulley and reducing the power transmission loss,
It becomes possible to convey the conveyed object at high speed.

According to a second aspect of the present invention, at least one of the drive belt and the plate-shaped member reduces friction generated by the pressure movement between the drive belt and the plate-shaped member due to the circulating movement of the drive belt. Therefore, the driving force from the drive belt can be reliably transmitted to each drive pulley, power transmission loss can be reduced, and deterioration of the drive belt can be further reduced.

According to the third aspect of the present invention, following the conveyance of the conveyed article, only the driving roller of the conveying roller through which the conveyed article passes is flexibly deformed by its own weight, and the conveyed article is sequentially transferred to the drive belt. Since it can be pressed by its own weight to bring the drive belt and the drive pulley into close meshing with one tooth, even if a sudden load change is transmitted to the drive belt, it is possible to prevent the tooth from jumping over. Is possible. Further, the drive belt is in contact with each supporting member, but a large frictional force acts only in the vicinity of the drive pulley where the conveyed product is bent and deformed by its own weight due to passage, and other driven pulleys through which the conveyed product does not pass. Since the portion is in contact with the support member with almost no load, it is possible to minimize the power transmission loss of the driving force of the drive mechanism and also the deterioration of the drive belt. As a result, it is possible to prevent the tooth portions of the drive belt and the drive pulleys from jumping over and to reduce the power transmission loss, and to convey the conveyed object at high speed.

According to a fourth aspect of the present invention, at least one of the support members and the drive belt has a friction reducing function for reducing the friction generated between the drive belt and the support members due to the circulating movement of the drive belt. Therefore, the driving force from the drive belt is reliably transmitted to each drive pulley, power transmission loss can be reduced, and deterioration of the drive belt can be further reduced.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 Hereinafter, a roller conveyor which is Embodiment 1 of the present invention will be described with reference to the drawings. 1 is a front view showing the configuration of the roller conveyor according to the first embodiment, FIG. 2 is a side view showing the configuration of the roller conveyor according to the first embodiment, and FIG. 3 is a tooth portion jump prevention for the roller conveyor according to the first embodiment. 4A to 4 are side views for explaining FIG.
(D) is a graph showing an experimental result of the roller conveyor in the first embodiment. It should be noted that FIG.
4 to FIG. 13, the same reference numerals as those in FIGS. 8 to 13 of the related art indicate the same configurations, and thus the description thereof will be omitted.

In FIGS. 1 and 2, reference numeral 50 is a roller conveyor, and the drive pulleys 8, 8, 8, ... Of the transport rollers 5, 5, 5 ,. In the same manner as shown by 10, only one tooth portion 21A of the plurality of tooth portions 21A of the drive belts 20, 20 is meshed with the groove portion 9B of each drive pulley 8, 8, 8 ,. ,
Only one tooth portion 9A of each of the drive pulleys 8, 8, 8, ... Is meshed with and suspended from the drive belts 20, 20 so as to engage with the groove portions 21B of the drive belts 20, 20.

55 and 55 are plate-like members on which the drive belts 20 and 20 are pressed via the respective drive pulleys 8, 8, 8, ... The drive belts 20 which are engaged with each other in a concavo-convex manner are arranged and opposed to each other with a predetermined gap T. In addition, each plate member 55, 5
The reference numeral 5 extends in the direction in which the frames 3 and 4 extend (the transfer direction of the transferred object 2), and is formed integrally with or attached to the frames 3 and 4. Then, the predetermined gap T between the drive belts 20 and 20 and the respective plate members 55 and 55
Is the own weight G of the conveyed object 2 that is conveyed over each of the conveying rollers 5, 5, 5, ..., And each of the conveying rollers 5, 5, 5 ,. In addition to being flexurally deformed to the side A, the drive pulleys 8, 8, 8, ... Attached to the shaft portions 7, 7 are on the opposite upper side B (each plate member 5).
5, 55)) and paying attention to the fact that the drive pulleys 8, 8, 8, ...
The drive belt 20, which is moved to the plate-shaped members 55, 55 side by the bending deformation of the drive pulleys 8, 8, 8 ,.
20 is pressed against the plate-shaped members 55, 55 so that the toothed portions 21A, 9A of the drive belts 20, 20 and the drive pulleys 8, 8, 8, ... The possible gap value (for example, the gap T is in the range of 0 to the height H × 1/3 of the tooth portion 9A of the drive pulley 8).

The roller conveyor 50 according to the first embodiment
Is configured as described above. Next, the operation of transporting the transported article 2 on the roller conveyor 50 and the operation of preventing the tooth jumping will be described with reference to FIGS. 1 to 3.

First, in order to convey the conveyed article 2 to a predetermined destination, the conveyed article 2 is placed on a plurality of conveying rollers 5, 5, 5, ... And the drive motor 14 of the drive mechanism 11 is rotated. The drive belts 20, 20 are circulated while being guided by the transmission pulleys 12, 13. When the drive belts 20, 20 are circularly moved, the tooth portions 21 of the drive belts 20, 20 are moved.
A and groove portions 9B of the respective drive pulleys 8, 8, 8, ... Or concave portions 21B of the drive belts 20, 20 and the respective drive pulleys 8,
The driving force generated by the circular movement of the drive belts 20, 20 is transmitted to the drive pulleys 8, 8, 8, ... .. are rotated, the shaft portions 7, to which the drive pulleys 8, 8, 8, ...
.. are rotated via the bearings 3A, 4A. Then, when each of the transport rollers 5, 5, 5, ... Rotates, the rotational force is transmitted to the transport object 2 placed on the transport rollers 5, 5, 5 ,. 2 is each conveyance roller 5, 5, 5, ...
-Transported to the specified destination in the transport direction (moved in a straight line).

At this time, the article 2 is conveyed by the respective conveyance rollers 5,
When passing through 5, 5, ..., As shown in FIG.
Since the conveyed object 2 receives the weight G of the conveyed object 2, the conveying roller 5 itself through which the conveyed object 2 passes bends and deforms in an arcuate shape on the lower side A with the frames 3 and 4 as fulcrums a and a (the center of the conveying roller 5 in the axial direction). The portion of the drive pulleys 8 and 8 located outside the frames 4 and 5 bends from the fulcrums a and a to the upper side B (the side opposite to the side on which the carrying roller 5 bends and deforms). To do. Further, since the own weight G of the conveyed object 2 acts on the frames 3, 4 from the fulcrums a, a of the frames 3, 4 via the bearings 3A, 4A in a substantially uniform manner, the downward direction A of the conveying roller 5 is caused. Following the movement of (3), each of the frames 3, 4 and each of the plate-shaped members 55, 55 also moves to the lower side A while maintaining the gap T with the drive belts 20, 20. As a result, each frame 3,
4 is flexibly deformed together with the plate members 55, 55 on the lower side A with the supports 15, 15 as fulcrums.
Since the drive pulleys 8, 8 located outside the frames 3, 4 from the fulcrums a, a are flexed and deformed to the upper side B, the drive belts 20, 20 and the plate-shaped members are deformed by the flexural deformation of the drive pulleys 8, 8. The drive belts 20 and 20 are driven by the drive pulleys 8 and 8 while absorbing the gap T between the plate-shaped members 5.
The plate-shaped members 55, 55 are moved to the side of 5, 55 and pressed against the plate-shaped members 55, 55 to be engaged. Then, due to this pressing, the transport rollers 5, 5 and 5 located in the vicinity where the transported product 2 passes.
The driving belts 20 and 20 of ... and the driving pulleys 8 and 8 are closely meshed with one tooth portion 21A and 9A,
The tooth portions 21A of the drive belts 20 and 20 have respective drive pulleys 8 and
, 8 or groove portions 9B of each drive pulley 8 or
The drive belt 2 is prevented while preventing the tooth portions 9A of 8, 8, ... from jumping over the groove portions 21B of the drive belts 20, 20.
The drive force from 0, 20 is surely applied to each drive pulley 8, 8,
8 to each of the transport rollers 5, 5, 5 ,.
Rotate.

After that, the transported object 2 is transferred to the respective transportation rollers 5, 5,
When passing through 5, ...
The self-weight G of the conveyed object 2 acting on each of the frames 3 and 4 is released via 5, ...
.. and flexural deformation of the frames 3 and 4 are eliminated, so that the drive pulleys 8, 8, 8, ...
5 and 55 are restored to their original positions, and drive belts 20 and 2 are
0 and the plate members 55, 55 are in a state of facing each other with a predetermined gap T.

As a result, the transport rollers 5, 5, 5, ...
..Each of the conveying rollers 5 near the conveyed object 2
.. are flexibly deformed together with the drive pulleys 8, 8, 8, ... By the own weight G of the conveyed object 2, and the drive pulleys 8, 8, 8 ,. By absorbing the gap T between the drive belts 20 and 20 and the plate-shaped members 55 and 55 by bending deformation of the drive belts 20 and 20, the drive belts 20 and 20 are press-engaged with the plate-shaped members 55 and 55, whereby the drive belt 20 , 20 contacting the respective plate-shaped members 55, 55 to a minimum to reduce the transmission loss thereof, and tooth portions of the drive belts 20, 20 and the drive pulleys 8, 8, 8 ,. It becomes possible to convey the conveyed object 2 at high speed while preventing the jumping of 9A and 21A.

Next, the results of an experiment carried out to prove that the roller conveyor 50 in the first embodiment reduces power transmission loss are shown in FIGS.
Description will be made based on (d). The experiment conducted this time is the roller conveyor 50 having the configuration of the first embodiment shown above.
(Hereinafter, simply referred to as “the first embodiment”) and the ID pulleys 31, 31, 31, ... In such a manner as to interpose the two drive pulleys 8, 8, 8, ... As shown in FIG. The comparison was made with the roller conveyor 30 (shown below as "conventional example").

As an experimental method, φ32 is used as the first embodiment.
60 drive pulleys 8 mm, φ32 mm as conventional example
Drive pulleys 8 and ID pulleys 31 are arranged so that a total of 60 drive pulleys 8 and ID pulleys are used, and the drive belts 20 and 20 having a width of 7 mm are used.
(Tension for external fitting and suspension on the drive pulley 8) 1.5 kg
For each of f and 4.5 kgf, the drive motor 14
Drive torque Tr (kgf · c
m) was measured. And as an experimental result, FIG.
And FIG. 4B show the “first embodiment” and the “conventional example” when the mounting tension F of the drive belts 20, 20 is 1.5 kgf.
4 (c) and 4 (d), the drive belts 20, 20
“Example 1” and “conventional example” when the mounting tension F of is set to 4.5 kgf.

4 (a) and 4 (c), in the first embodiment, the driving torque Tr corresponding to each mounting tension F is 1.7 kgf · cm (mounting tension F = 1.5 kg).
f), 2.3 kgf · cm (mounting tension F = 4.5 kg
f). Further, in FIGS. 4B and 4D, in the conventional example, the drive torque T corresponding to each mounting tension F is set.
r is 11.2 kgf · cm (mounting tension F = 1.
5 kgf), 15.3 kgf · cm (mounting tension F = 4.
5 kgf). From this result, the driving torque Tr of the first embodiment is reduced by about 6.5 times as compared with the conventional example, and the driving belts 20, 20 of the driving motor 14 drive the driving pulleys 8, 8, 8 respectively. The driving force to the drive belts is reliably transmitted, and the transmission loss is reduced, and as described above, the drive belts 20, 20 and the drive pulleys 8, 8, 8,
It is possible to prevent the one tooth portion 9A, 21A from jumping over.

In the first embodiment, the drive belt 2
Contact resistance (friction) between 0, 20 and each plate member 55, 55
In order to further reduce the above, the drive belts 20 and 20 are made of a non-lubricated material having a low friction coefficient or a resin material and a mixed material of a fiber material, and the drive belts 20 and 20 are made of rubber or the like. After that, it can be achieved by providing a friction reducing function 56 (shown in FIG. 1) in which a resin material or a fiber material having a low friction coefficient is attached to the side surface engaging with each plate member 55, 55, Further, the friction coefficient is reduced by polishing the surface of each plate member 55, 55 engaged with the drive belt 20, 20, or the surface engaged with the drive belt 20, 20 is made of a resin material or a fiber material having a low friction coefficient. It can also be achieved by providing the friction reducing function 56 that is attached.

Embodiment 2 Hereinafter, a roller conveyor which is Embodiment 2 of the present invention will be described with reference to the drawings. FIG. 5 is a front view showing the configuration of the roller conveyor according to the second embodiment, FIG. 6 is a side view showing the configuration of the roller conveyor according to the second embodiment, and FIG. 7 is a tooth portion jump prevention for the roller conveyor according to the second embodiment. It is a side view for explaining. 5 to 7 in the first embodiment, the same reference numerals as those in FIGS. 8 to 13 of the related art indicate the same configurations, and thus the description thereof will be omitted.

In FIGS. 5 and 6, reference numeral 60 denotes a roller conveyor, and a pair of support members 61, 61 are separately provided side by side at the ends of the frames 3, 4 on the supports 15, 15. The supports 61, 61 extend in the extending direction of the frames 3, 4. The drive belts 20 and 20 are arranged and suspended on the respective support members 61 and 61 in the direction in which the frames 3 and 4 extend with the side on which the concavo-convex shape 9 is continuous as the upper side. Then, the transport rollers 5, 5, 5, ...
Of the drive pulleys 8, 8, 8, ...
Only one tooth portion 9A of A is meshed with the groove portion 21B of the drive belt 20, 20 (or the drive belt 20, 20).
Only one tooth 21A of each drive pulley 8, 8, 8, ...
The engagement with the drive belts 20 and 20 is made by engaging with the drive belts 20, 20 so as to engage with the groove portion 9B.

The frames 3 and 4 are made of a material having a lower rigidity than the supporting members 61 and 61. That is, the conveyed product 2 is conveyed by the respective conveying rollers 5, 5,
5, ... Due to the own weight G of the conveyed object 2 acting when it is conveyed above, each frame 3, 4 has a larger amount of bending deformation than the amount of bending of each support 61, 16 and the lower side A. Are bent and deformed to move the drive pulleys 8, 8, 8, ...
A material having an elastic coefficient that allows it to be pressed against 0, 20;
Alternatively, it is formed of a material (a material having low rigidity or a material).

The roller conveyor 60 according to the second embodiment
Is configured as described above, and next, the operation of transporting the transported object 2 and the prevention of jumping of the tooth portion on the roller conveyor 60 will be described with reference to FIGS. 5 to 7.

First, in order to convey the conveyed article 2 to a predetermined destination, the conveyed article 2 is placed on a plurality of conveying rollers 5, 5, 5, ... And the drive motor 14 of the drive mechanism 11 is rotated. The drive belts 20, 20 are circulated while being guided by the transmission pulleys 12, 13. When the drive belts 20, 20 are circularly moved, the tooth portions 21 of the drive belts 20, 20 are moved.
A and groove portions 9B of the respective drive pulleys 8, 8, 8, ... Or concave portions 21B of the drive belts 20, 20 and the respective drive pulleys 8,
The driving force generated by the circular movement of the drive belts 20, 20 is transmitted to the drive pulleys 8, 8, 8, ... The drive pulleys 8, 8, 8, ... Rotate, and the drive shafts 8, 8, 8 ,.
Each of the transport rollers 5, 5, 5, ...
・ Rotates. Then, the transport rollers 5, 5, 5, ...
· When is rotated, the rotational force is transmitted to the conveyed article 2 placed on the conveyed rollers 5, 5, 5, ...
Is transported (moved in a straight line) on each of the transport rollers 5, 5, 5, ... In the transport direction to a predetermined destination.

At this time, the article 2 is conveyed by the respective conveyance rollers 5,
When passing through 5, 5, ..., As shown in FIG.
Since the conveyed object 2 receives the weight G of the conveyed object 2, the conveying roller 5 itself through which the conveyed object 2 passes bends and deforms in an arcuate shape on the lower side A with the frames 3 and 4 as fulcrums a and a (the center of the conveying roller 5 in the axial direction). The part is bent the most). Further, since the own weight G of the conveyed object 2 acts on the respective frames 3, 4 from the fulcrums a, a of the respective frames 3, 4 through the bearings 3A, 4A in a substantially uniform manner, the lower side A of the conveying roller 5 is reached. The frames 3 and 4 also move to the lower side A following the movement of A. As a result, the drive pulleys 8 and 8 located outside the fulcrums a and a of the frames 3 and 4 and outside the frames 3 and 4 engage the drive belts 20 and 20 against the support members 61 and 61, respectively. The drive belt 20 for each of the transport rollers 5, 5, 5, ...
20 and the tooth portions 21A of the drive belts 8 and 8 are closely meshed so that the tooth portions 21A of the drive belts 20 and 20 are groove portions 9B of the drive pulleys 8, 8, 8 ,.
, Or the tooth portions 9A of the drive pulleys 8, 8, 8, ... Are prevented from jumping over the groove portions 21B of the drive belts 20, 20, while the drive force from the drive belts 20, 20 is reliably driven. .. are transmitted to the pulleys 8, 8, 8, ...

After that, the transported object 2 is transferred to the respective transportation rollers 5, 5,
When passing through 5, ...
The self-weight G of the conveyed object 2 acting on each of the frames 3 and 4 is released via 5, ...
.. Since the bending deformation of .. is eliminated, each drive pulley 8,
, And the conveying rollers 5, 5, 5, ... Are restored to their original positions and the drive belt 20,
20 is engaged with one tooth portion 9A, 21A.

As a result, the transport rollers 5, 5, 5, ...
..Each of the conveying rollers 5 near the conveyed object 2
, 5 are flexibly deformed by the weight G of the conveyed object 2, and the drive belts 20, 20 are pressed against the support members 61, 61 by the drive pulleys 8, 8, 8 ,. By engaging the drive belts 20 and 20, it is possible to minimize the contact of the drive belts 20 and 20 with the support members 61 and 61 with a pressing force, to reduce the power transmission loss thereof, and to drive the drive belts 20 and 20 and the respective drive members. It is possible to convey the conveyed object 2 at high speed while preventing the tooth portions 9A and 21A from interfering with the pulleys 8, 8, 8 ,.

In the second embodiment, in order to further reduce the contact resistance (friction) between the drive belts 20 and 20 and the support members 61 and 61, the drive belts 20 and 20 are rubbed with a non-lubricated material. A resin material having a low coefficient, a material formed of a mixed material of a resin material and a fibrous material, or a side surface having a low friction coefficient on the side surface engaged with each support member 61, 61 after molding the drive belts 20, 20 with rubber or the like. This can be achieved by providing a friction reducing function 65 (shown in FIG. 5) to which a resin material or a fiber material is attached, and each supporting member 61, 61
The friction reducing function 65 is such that the surface engaging with the drive belts 20 and 20 is polished to reduce the coefficient of friction, or a resin material or a fiber material having a low coefficient of friction is attached to the surface engaging with the drive belts 20 and 65. It can also be achieved by having.

[0038]

As described above, according to the roller conveyor of the present invention, only the driving roller of the conveying roller, which is passed by the conveyed object, is moved by the plate-shaped member side by its own weight, following the conveyance of the conveyed object. The drive belt near the drive pulley, which is deformed while absorbing a predetermined gap, is press-engaged with each plate-shaped member provided in each frame to sequentially form one tooth portion of the drive belt and the drive pulley. Since the meshing of the teeth can be made close to each other, it is possible to prevent the tooth portion 21 from jumping over even if a sudden change in the load is transmitted to the drive belt.
Further, the contact of the drive belt is only in the vicinity of the drive pulley which is deformed by the weight of the conveyed object, so that the power transmission loss of the drive force of the drive mechanism can be minimized and the deterioration of the drive belt can also be minimized. Becomes As a result, it is possible to convey the conveyed object at a high speed while preventing the tooth portions of the driving belt and the driving pulleys from jumping over and reducing the power transmission loss.

Further, at least one of the drive belt and the plate-shaped member has a friction reducing function of reducing the friction generated by the pressure engagement between the drive belt and the plate-shaped member due to the circulating movement of the drive belt. Therefore, the driving force from the driving belt can be reliably transmitted to each driving pulley, power transmission loss can be reduced, and deterioration of the driving belt can be further reduced.

Further, according to the roller conveyor of the present invention,
Following the conveyance of the conveyed object, only the drive roller of the conveying roller through which the conveyed object passes is deformed by the own weight of the conveyed object, and sequentially pressed by the own weight of the conveyed object to the drive belt. Since one tooth portion can be brought into close contact with the drive pulley, it is possible to prevent the tooth portion from jumping over even if a sudden load change is transmitted to the drive belt. Further, the drive belt is in contact with each support member, but a large frictional force acts only in the vicinity of the drive pulley where the conveyed product is deformed by its own weight due to passage, and other driven pulley parts where the conveyed product does not pass. Since is in contact with the support member under almost no load, it is possible to minimize power transmission loss of the driving force of the drive mechanism and also to minimize deterioration of the drive belt. As a result, it becomes possible to convey the conveyed object at a high speed while preventing the tooth portions of the drive belt and the drive pulleys from jumping over and reducing the transmission loss.

At least one of the support members and / or the drive belt has a friction reducing function of reducing the friction generated between the drive belt and each of the support members due to the circulating movement of the drive belt. Therefore, the driving force from the drive belt can be reliably transmitted to each drive pulley, power transmission loss can be reduced, and deterioration of the drive belt can be further reduced.

[Brief description of drawings]

FIG. 1 is a front view showing a configuration of a roller conveyor according to a first embodiment of the present invention.

FIG. 2 is a side view showing the configuration of the roller conveyor according to the first embodiment of the present invention.

FIG. 3 is a side view for explaining prevention of jumping over of tooth portions in the roller conveyor according to the first embodiment of the present invention.

4A to 4D are graphs showing experimental results of the roller conveyor according to the first embodiment of the present invention.

FIG. 5 is a front view showing a configuration of a roller conveyor according to a second embodiment of the present invention.

FIG. 6 is a side view showing the configuration of the roller conveyor according to the second embodiment of the present invention.

FIG. 7 is a side view for explaining prevention of jumping over of tooth portions in the roller conveyor according to the second embodiment of the present invention.

FIG. 8 is a front view showing a configuration of a first roller conveyor according to a conventional technique.

FIG. 9 is a side view showing a configuration of a first roller conveyor according to a conventional technique.

FIG. 10 is an enlarged view of the first roller conveyor in the related art in FIG.

FIG. 11 is an enlarged front view showing the configuration of a second roller conveyor according to the prior art.

FIG. 12 is a front view showing a configuration of a third roller conveyor according to a conventional technique.

FIG. 13 is an enlarged view of a third roller conveyor in the related art in FIG.

[Explanation of symbols]

 2 Transported Objects 3, 4 Frames 5 Transport Rollers 7 Shafts 8 Drive Pulleys 9 Concavo-convex Shape 9A Teeth 14 Drive Motor 20 Drive Belt 21 Concavo-convex 21A Teeth 50, 60 Roller Conveyor 55 Plate Member

Claims (4)

[Claims] 1. A plurality of transport rollers rotatably arranged side by side via a shaft between a pair of frames extending in the transport direction of a transported product, and both ends of the shaft of each of the transport rollers protruding from each frame. A drive pulley that is attached and has an uneven shape having a plurality of teeth at a predetermined pitch on the outer periphery, and an uneven shape having a plurality of teeth that mesh with each of the drive pulleys is formed on each of the drive pulleys. An annular drive belt suspended by meshing one of the teeth, and a drive mechanism in which a driving force is transmitted to each of the drive pulleys by circulatingly moving the annular drive belt, and in each frame, A plate-like member that faces the drive belt on the side that meshes with the drive pulleys with a predetermined gap is provided, and the predetermined gap between the drive belt and the plate-like member conveys on each of the conveyance rollers. The amount of flexural deformation of each drive pulley flexibly deformed toward each plate-shaped member via each of the transport rollers is absorbed by the weight of the conveyed object to be conveyed, and the drive belt presses each plate-shaped member. A roller conveyer characterized by having a gap value that enables matching. 2. A friction reducing function for reducing at least one of the drive belt and the plate-shaped member, which is generated by a pressure movement between the drive belt and the plate-shaped member due to the circular movement of the drive belt. The roller conveyor according to claim 1, characterized by comprising: 3. A plurality of conveying rollers rotatably arranged side by side via a shaft between a pair of frames extending in the conveying direction of the conveyed object, and a plurality of conveying rollers arranged in parallel to each frame in the extending direction of each frame. A pair of extending support members, a drive pulley that is attached to both ends of the shaft of each of the transport rollers protruding from each frame, and has an irregular shape having a plurality of teeth at a predetermined pitch on the outer periphery, and each of the drive pulleys. An annular drive belt is formed that has a plurality of teeth that mesh with each other and that is suspended on each of the support members with the uneven shape facing upward, and the annular drive belt is circularly moved to drive the drive pulleys. A drive mechanism for transmitting force, wherein each of the drive pulleys is arranged such that one tooth portion of the plurality of tooth portions of each drive pulley is meshed with the drive belt. Roller conveyor. 4. At least one of each of the support members and the drive belt has a friction reducing function of reducing friction generated between the drive belt and each of the support members due to the circulating movement of the drive belt. The roller conveyor according to claim 3, wherein