JPH05712A - Roller conveyor - Google Patents

Abstract

PURPOSE:To enable almost all parts to be covered except to expose only a necessary part of a roller by constituting a side part cover in such a way that the outer edge can be engaged/disengaged freely with/from a side frame from the inside and the inner edge can be also brought into contact freely with a transmission device from above. CONSTITUTION:A transmission device 20 is formed of resin, and a case shape support frame 21A is used as its main body, and the lower edge of a base plate part 22 of its longitudinal direction is used as a locking part 17A, and is engaged with a locking groove 2A from above, and an oblique/outward butt part 18A is formed on the upper edge of the base plate part 22. Furthermore, a bolt 23A passing through from above into a bolt hole formed in the butt part 18A is driven into a nut body 3A, so that positional change (by sliding movement) can be carried out freely in the frame length direction and fixation can be carried out freely in the changed position. As for a cover plate unit 24 arranged consecutively inward from the lower half inside surface of the base plate part 22, its both edges are connected by means of a connecting plate part 25. Further, a bearing hole part 26 is formed under the base plate part 22, and both edges of a lateral directional support shaft 27 are embedded in the bearing hole unit 26, so that the support shaft 27 can be fluctuated freely in the vertical direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller conveyor used when, for example, an object to be processed is conveyed via a pallet.

[0002]

2. Description of the Related Art Conventionally, as a roller conveyor of this type, a structure disclosed in, for example, Japanese Utility Model Laid-Open No. 1-111609 has been provided. In this conventional structure, the main body frame is composed of a pair of left and right side frames and a base frame connecting the lower parts of these side frames. A support frame is provided on the inner surfaces of the side frames that face each other, and a transport roller is provided between the support frames. Further, a driving body or the like is arranged on one side frame side, and a transmission roller which is interlocked with this driving body and which is connectable / separable to / from the carrying roller is provided on one supporting frame.

[0003]

According to the above-mentioned conventional type, since the entire periphery of the conveying roller group is open, the appearance becomes poor, and dust from the object to be conveyed is caused between the conveying rollers. It had fallen from the ground and had a bad effect on the driving body and transmission roller, and also had the surroundings dirty. Further, it is necessary to prepare a transport roller having a length corresponding to the machine width, and the types and amounts of the stocks are large.

It is an object of the present invention to expose only a necessary portion of the roller and cover most of the roller, and the cover can easily cope with various machine widths, and further, to various machine widths. The point is to provide a roller conveyor that can use common rollers.

[0005]

In order to achieve the above object, the roller conveyor of the present invention is provided with a pair of left and right side frames, and a support frame is detachably provided on each of the inner surface sides of the side frames facing each other. The support frame is provided with a freely rotatable roller, a drive device is provided on one side frame side, and a transmission device that is interlocked with this drive device and is connectable and separable to the roller on one side is provided, and the upper part of the roller is exposed. A pair of left and right side covers that allow the above-mentioned side covers are provided. The outer edges of the side covers are engageable with and disengageable from the inside of the side frame, and the inner edges of the side covers are abuttable against the transmission from above. An intermediate portion cover that can be fitted from above between the inner portions is provided.

[0006]

According to the structure of the present invention, most of both rollers are formed by engaging the outer edges of the both side covers with respect to the side frame from the inside and abutting the inner edge of one side against the transmission from above. Can be placed on both sides with the cover from above.
By fitting an intermediate cover having a width corresponding to the machine width from above between the inner parts of the both side covers, the space between these side covers can be completely covered with the intermediate cover.

The pallet or the like is supported between the exposed upper portions of the left and right rollers, and is conveyed by the driving force of the roller on one side which is forcibly rotated by the driving device via the transmission device. The dust generated at that time can be received by each cover.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 5, reference numeral 1 denotes a main body frame, which is a pair of left and right side frames 80A and 80B, and a pair of bars 81A and 81 which are connected to the lower portions of the side frames 80A and 80B and extend inward to face each other vertically.
B, and a bracket 82 which is attached to the free ends of these bars 81A, 81B and is connectable to the bars 81A, 81B facing each other.
A and 82B, which are installed at a predetermined height on the floor via a plurality of legs 40 connected to a lower bar 81A.

Here, the leg body 40 has an outer leg portion 41A whose upper end is fixed to the outer end of a lower bar 81A, and a lower bar.
It is composed of an inner leg portion 41B whose upper end is fixed to the middle portion of 81A and a connecting member 42 provided between the middle portions of both leg portions 41A and 41B in the vertical direction, and is a lower rank outside the inner leg portion 41B. Bar 81
A recessed opening 43 is formed across the end of A.

1 to 3, in the middle portions of the inner side surfaces of the both side frames 80A and 80B which face each other, a locking groove 2A having an open upper surface,
2B is formed, and dovetail groove portions 4A, 4B that allow the sliding of the nut bodies 3A, 3B are formed obliquely upward at the upper portion, and mounting groove portions 5A, 5B of the guide bodies 8A, 8B are further formed at the upper end. It is formed to be open inside. Further, between the locking grooves 2A, 2B and the mounting groove portions 5A, 5B, cover locking grooves 6A, 6B having an L-shaped cross section are formed so as to open inside, and are continuous with the bottom surfaces of the cover locking grooves 6A, 6B. To form inward cover receiving surfaces 7A and 7B.

On one side frame 80A, a pair of guide rails 10a and 10b are arranged on the inner surface side of the lower part thereof in the longitudinal direction of the frame through mounting portions 9a and 9b, respectively. Further, the other side frame 80B is formed to have a low height without a mounting portion or the like.

On the side of the main body frame 1, a pair of left and right idler rollers 11A, 11B are arranged inside the side frames 80A, 80B. Here, one idler roller group 11A is unitized with the transmission device 20 or the braking device 50.

That is, as shown in FIGS. 1 and 3, the transmission device 20 has a case-shaped support frame 21A made of resin as a main body, and the lower end of the base plate portion 22 in the longitudinal direction thereof is used as the engagement portion 17A. While engaging with the groove 2A from above, an obliquely outward contact portion 18A is formed at the upper end of the base plate portion 22, and a bolt 23A passed from above into a bolt hole formed in this contact portion 18A is attached to the nut body 3A. By screwing, the position can be freely changed (slipped) in the frame length direction and can be fixed at the changed position.

The lower end of the cover plate portion 24 which is continuously provided from the inner surface of the lower half of the base plate portion 22 inward is connected by a connecting plate portion 25. Further, a bearing hole portion 26 is formed in the lower portion of the substrate portion 22, and an inner end of a support shaft 27 in the left-right direction is fitted into the bearing hole portion 26 so that the support shaft 27 can be vertically swung. Grooves 24a that are open on opposite sides are formed in the left and right directions in the lower portions of both cover plate portions 24. The resin-made L-shaped plate 28 including the horizontal plate portion 28a and the vertical plate portion 28b has a groove formed on both edges of the horizontal plate portion 28a.
It is attached to the support frame 21A side by being fixed after being inserted into 24a.

The outer end of the support shaft 27 is fitted in a vertical recess 29 formed in the vertical plate portion 28b to regulate the vertical swing range of the support shaft 27. A passive chain wheel 30, which is an example of a passive body, is rotatably attached to the support shaft 27.
A transmission roller 31 which is an example of a transmission body is attached to the protruding boss portion of 30.
Is fitted to the outside so that both 30 and 31 can rotate together. The transmission roller 31 is made of urethane rubber, and the outer periphery of the transmission roller 31 is connectable and separable (abuttable and separable) to the lower outer peripheral portion of the idler roller 11A.

A cylinder device 32 using air for connecting and disconnecting is interposed between a cylinder rubber receiver 33 attached to the outer end of the support shaft 27 and a horizontal plate portion 28a of the L-shaped plate 28. Further, from the middle of the vertical plate portion 28b of the L-shaped plate 28, the bolt 34
A receiving plate 35 is continuously provided inwardly via a through hole, and a compression spring 36 for pushing down and supporting the support shaft 27 is interposed between the lower surface of the receiving plate 35 and the upper surface of the cylinder rubber receiver 33. There is. 21 more
A transmission device (20) is constituted by ~ 36.

The idler roller 11A is provided on the substrate portion 22.
Is attached. That is, a through hole 12A in the left-right direction is formed in the upper portion of the base plate portion 22, and a nut installation portion 13A having an open top is formed in the middle portion of the through hole 12A.
The roller shaft 14A has a bolt shape and externally fits and holds the idler roller 11A via a bearing 15A. Then, the roller shaft 14A is inserted in the through hole 12A from the inside in the left-right direction, and then screwed into the nut 16A installed in the nut installation portion 13A, whereby the idle roller 11A is provided in a cantilever shape without being supported inside. The roller shaft 14A is rotatably disposed.

As shown in FIGS. 2 and 5, the other idler roller 11B is similarly arranged. That is, the support frame 21B is formed of resin in a vertical case shape, and the lower end of the support frame 21B has a locking portion.
17B is engaged with the locking groove 2B from above, and an obliquely outward contact portion 18B is formed at the upper end, and a bolt 23B is inserted through the bolt hole formed in the contact portion 18B from above.
By screwing with the nut body 3B, the position can be changed (slipped) in the frame length direction and can be fixed at the changed position.

The other idler roller 11B is attached to the support frame 21B. That is, a through hole 12B in the left-right direction is formed in the upper portion of the support frame 21B, and a nut installation portion 13B having an open top is formed in the middle portion of the through hole 12B.
The roller shaft 14B has a bolt shape and externally fits and holds the idler roller 11B via a bearing 15B. Then, the roller shaft 14B is inserted in the through hole 12B from the inside in the left-right direction, and then screwed into the nut 16B installed in the nut installation portion 13B, whereby the idler roller 11B is provided in a cantilever shape without being supported inside. The roller shaft 14B is freely rotatably arranged. The lower half of the support frame 21B on the inner surface side is formed into a downward constricted sloped portion, and the pipe support portion 19 projecting inward is formed in the sloped portion.
Are integrally formed in a plurality of upper and lower stages.

As shown in FIG. 6, the drive device 44 interlocked with each transmission device 20 includes a chain 45 that meshes with each passive chain wheel 30, a drive chain wheel 46 and a driven chain wheel 47 that stretch the chain 45. It is composed of a guide chain wheel 48 and a motor 49 linked to the drive chain wheel 44, and the chain 45 is supported and guided by the guide rails 10a and 10b.

The braking device 50 has the same structure as the transmission device 20, and only different parts will be described below. That is, as shown in FIG. 3 and FIG. 6, a non-passive chain wheel 51 is rotatably attached to the support shaft 27, and a urethane rubber braking body 52 is fixed to the protruding boss portion of the non-passive chain wheel 51. ing. The non-passive chain ring 51 has a toothless shape, and approximately half of the toothless portion 51a is
The stopper body 53, which is opposed to 45 and engages between the teeth of the remaining toothed portions 51b, can be inserted into and removed from the support cylinder portion formed on the substrate portion 22. Here, the idle roller on which the braking body 52 can freely abut is shown by 11a, and the cylinder device that moves the support shaft 27 upward is shown by 54.

As shown in FIGS. 1 to 5, the bars 81A and 81B are extruded products having three dovetail grooves 83 and 84 on the upper and lower surfaces, respectively, and the base ends of the bars 81A and 81B are connecting members 85.
It is connected to the lower portions of the side frames 80A and 80B via A and 85B.
The connecting members 85A and 85B have a pair of front and rear bolt holes 86 in the outer half portion, and bolts 87 that pass through the bolt holes 86 from below are formed at the lower ends of the side frames 80A and 80B. Nut body 89 arranged in the dovetail groove portion 88A, 88B
It is fixed to the lower part of the side frames 80A and 80B by being screwed into the A and 89B.

Further, the inner half portions of the connecting members 85A and 85B can freely abut on the upper surfaces of the bars 81A and 81B, and from the lower surface thereof, positioning projections 90 which can be fitted into the dovetail grooves 83 on both sides of the upper portion are continuously provided. Has been done. Further, a pair of left and right bolt holes 91 are formed between the positioning projections 90 in the vertical direction, and bolts 92 that pass through the bolt holes 91 from above are screwed into a nut body 93 arranged in a central dovetail portion 83. By combining them, the base ends of the bars 81A and 81B can be fixed to the connecting members 85A and 85B.

The brackets 82A and 82B are provided with bars 81A,
The free end of 81B has a step surface 94 which can be freely abutted against the end surface and the upper surface or the end surface and the lower surface, and a pair of vertical bolt holes 95 are formed in the inner half portion. A bolt 96, which is passed through the bolt holes 95 from above or below, is screwed into a nut body 97 arranged in the dovetail groove portion 83 or 84 in the central portion, so that the free ends of the bars 81A and 81B are respectively bracketed. 82A and 82B can be fixed.

A vertical bolt hole 98 is formed in the central portion of the outer half of each of the brackets 82A and 82B, and a bolt 99, which is passed through the bolt hole 98 from below or above, is arranged in the central dovetail groove 84 or 83. By being screwed into the nut body 100 that is installed, the brackets 82A and 82B are opposed to each other in the bar 81.
It can be detachably connected to A and 81B.

As shown in FIG. 5, the transported object 57 comprises, for example, an aging pallet 58 and an aging product 59 placed on the pallet 58. Therefore, the upper end of the bar 81B on the inner end side is higher. An aging device 56 is arranged in the. Ordinary transportation without aging may be used, and the pallet 58 may not be used for transportation.

As shown in FIGS. 1 to 3, the left and right idler rollers 11A, 11a and 11B are provided in the idler rollers 11A, 11a and 11B.
A pair of left and right side covers 101A, 101B which allow the upper portions of A, 11a, 11B to be exposed are provided. These side covers 101
A and 101 B are made of, for example, aluminum and have a laterally L-shaped cross section.

The outer edges of the horizontal plate portions 102A and 102B, which are upper parts of the side cover portions 101A and 101B, have the cover engaging grooves 6A,
6B, engaging portions 103A, 103 that can be engaged and disengaged from the inside
The cover receiving surfaces 7A and 7B can be abutted on the cover receiving surfaces 7A and 7B near the locked portions 103A and 103B from above. Of the lower ends (inner edges) of the lower vertical plate portions 104A and 104B, the lower end on the transmission 20 side is the cover plate portion.
The contact portion 105 is formed so as to be capable of contacting the upper portion 24 from above.

Through holes 106A, 106B for exposing the upper portions of the idle rollers 11A, 11a, 11B are formed at predetermined pitches in the horizontal plate portions 102A, 102B, and the vertical plate portion 104 is formed. The side covers 101 A, 10 are provided on the outer surfaces of A, 104 B.
Connection holes 107A and 107B are formed to allow fitting of connection pins when connecting 1B in the length direction. Further, stepped cover support portions 108A and 108B are formed by the portions forming the connection holes 107A and 107B.

The intermediate cover 110, which can be fitted between the inner parts of the both side covers 101A and 101B from above, is formed in a flat plate shape, for example, made of iron. Then, both side portions are bent downward to form fitting portions 111 A and 111 B which can come into contact with the cover supporting portions 108 A and 108 B from above.
Further, the intermediate portion cover 110 is formed with a through hole 112 for projecting the action portion of the aging device 56.

The conveying path 60 consisting of the above-mentioned idle rollers 11A, 11B and 11a is divided into a plurality of zones in the path direction. That is, in the embodiment, as shown in FIG. 6, seven zones A to G are sequentially divided from the upstream side to the downstream side. In each zone A to G, a braking device 50 is provided facing at least one idler roller 11a, and a transmission device 20 is provided opposite to the remaining idler rollers 11A.

Each zone A to G is separately connected and separated,
At that time, a valve device 61 for reversibly connecting and disconnecting the braking device 50 and the transmission device 20 is provided. That is, the first supply / discharge hose 62 connected to the cylinder device 32 group of the transmission device 20 and the second supply / discharge hose 63 connected to the cylinder device 54 of the braking device 50 are connected via the 5-port electromagnetic valve device 61. The supply hose 65 from the supply source 64 is reversibly connectable. The hoses 62, 63, 65 and the like are arranged on the pipe support portion 19 shown in FIG.

Two zones adjacent to each other in the transport direction are provided with a control circuit 70 connected to each valve device 61 so that the transmission device 20 can be connected to the downstream zone when the transported object 57 is absent. That is, the control device 71A, which corresponds to each zone A to G,
71B, 71C, 71D, 71E, 71F, 71G are arranged, and these control devices 71A to 71G are connected to each other and to the power supply device 72 in series. The presence detection devices 73B, 73C, 73D, 73E, and
73F and 73G are provided, and these presence detection devices 73B to 73G are provided.
Are connected to the control devices 71A to 71F in the adjacent upstream zones.

For example, the presence detection device 73B is the control device 71A.
73C is connected to 71B. Then, each control device 71A to 71G, when the downstream load detection device is not detected, connects the corresponding valve device 61 with the control signals 74A, 74B, 74C to connect the zone and the upstream zone. 74D, 74
It is configured to give E, 74F and 74G.

In order to assemble the roller conveyor of the above embodiment, first, the transmission device is mounted on one side frame 80A through the support frame 21A.
20 is provided and the supporting frame 21B is provided on the other side frame 80B.
Is provided. That is, the support frames 21A and 21B have locking portions 17
A and 17B are engaged with the locking grooves 2A and 2B from above, and bolts 23A and 23B, which are passed from above into bolt holes formed in the contact portions 18A and 18B, are screwed into the nut bodies 3A and 3B. Is set up.

Next, the idler roller 11 is attached to the one support frame 21A.
The groups A and 11a are arranged, and the idler roller 11B group is arranged on the other supporting frame 21B. After inserting the roller shafts 14A and 14B with the idle rollers 11A, 11a and 11B fitted and held through the bearings 15A and 15B from the inside into the through holes 12A and 12B in the left-right direction, the inside of the nut setting portions 13A and 13B is inserted. The cantilevered roller shaft can be screwed into the nuts 16A and 16B of
It is arranged to be freely rotatable through 14A and 14B.

The free ends of the bars 81A, 81B connected to the lower portions of the side frames 80A, 80B via the connecting members 85A, 85B are connected to the opposed bars 81A, 81B via the brackets 82A, 82B. By doing so, as shown by the solid line in FIG. 5, it is possible to make the usage width L shortest.

To change the machine width L in this state, first loosen the bolt 99. Then, the side frames 80A and 80B are moved so as to be separated from each other. At this time, the nut body 100 has the dovetail groove 8
It slides in 3, 84, so that the separation is stable. After that, by tightening the bolt 99, it is possible to change to a desired long machine width L as shown by the phantom line in FIG.

At this time, since the idling rollers 11A, 11a, 11B are separately attached to the left and right side frames 80A, 80B, it is not necessary to replace them when the machine width is changed. Moreover, when the machine width L is changed, the opened state is maintained only by changing the width of the opening portion 43. Therefore, when the machine width L is the shortest and the longest, the operator's foot is a leg body. 40
Is not interfered with. When the machine width L is shortened, the side frames 80A and 80B may be brought close to each other in the same manner as described above.

Next, the side covers 101A and 101B are attached, and the intermediate cover 110 is arranged according to the machine width L. That is, the side covers 101A, 101B are arranged in a tilted posture so that the locked parts 103A, 103B are attached to the cover receiving surface 7a.
After abutting against A and 7B, they are pushed in, and the engaged portions 103A and 103B are inserted into the cover engaging grooves 6A and 6B as shown by the phantom line in FIG.

Then, it is rotated downward about the insertion portion, and as shown by the solid lines in FIGS. 1 and 2, the horizontal plate portion 102A,
102B is horizontal, and the abutting part 105 is a cover plate part 24.
Abut. At this time, the upper portions of the idle rollers 11A, 11a, 11B are exposed upward through the through holes 106A, 106B. As a result, the both side covers 101A, 101B can be arranged on both sides with most of the idler rollers 11A, 11a, 11B being covered from above.

Next, an intermediate cover 11 having a width corresponding to the machine width L
0 is prepared, and this middle cover 110 is used for both side covers 10.
It is fitted from above between 1A and 101B. This fitting is performed by fitting the cover supporting portions 108A and 108B into the fitting portions 111A and 108B.
The process is repeated until 111B comes into contact. This allows side covers
The intermediate portion cover 110 can completely cover between 101A and 101B.

Next, the operation of conveying the object to be conveyed 57 in the roller conveyor assembled as described above will be described. 1,
In the zones C and D of FIG. 3 and FIG. 6, the valve device 61 is switched to connect the first supply / discharge hose 62 corresponding to the transmission device 20 to the supply hose 65, and the compression spring 36 is expanded by the expansion of the cylinder device 32.
The support shaft 27 is swung upwards against the pushing biasing force, and the transmission roller 31 is brought into contact with the corresponding idler roller 11A from below.

At this time, the chain 45 is constantly driven by the motor 49, so that all the passive chain wheels 30 meshing with the chain 45 are rotating around the support shaft 27. Furthermore, the transmission roller 31 is in contact with the lower portion of the outer periphery of the idler roller 11A, and thus the idler roller 11A group is forcibly rotated.

As a result, the transferred object 57 on the transfer path 60 is
While being supported between the groups of both idler rollers 11A and 11B, and receiving the carrying force by the forced rotation of the idler roller 11A group on one side, both side surfaces are guided by the guide body 77, and on this carrying path 60. Will be transported in. The dust generated at that time is received by each of the covers 101A, 101B, 110 and is prevented from falling downward.

At this time, since the second supply / discharge hose 63 corresponding to the braking device 50 is opened and the cylinder device 54 is inactive, the support shaft 27 is swung downward by the pressing force of the compression spring 36. The braking body 52 is moved away from the idler roller 11a. Therefore, no braking action is generated, and the corresponding idler roller 11a idles due to the movement of the pallet 58.

For example, as shown in zones A, B, E to G of FIG. 6, the valve device 61 is switched to connect the supply hose 65 to the second supply / discharge hose 63, and the compression spring is expanded by the expansion of the cylinder device 54.
The support shaft 27 is swung upward against the pushing force of the pressing member 36, and the braking body 52 is brought into contact with the corresponding idler roller 11a from below to prevent the idler roller 11a from idling. Therefore, the object 59 to be conveyed can be braked to prevent the object 59 from being conveyed.

When the braking body 52 is brought into contact with the support shaft 27 in this way, the first supply / discharge hose 62 is opened and the cylinder device 32 is deactivated. Swing it downward and rotate the idle roller 11 as shown by the phantom line Q in FIG.
By separating the transmission roller 31 from A, the idle roller 11
The group A is made non-driving.

While the transported object 57 is being conveyed in this manner, the desired aging treatment is performed on the aging product 59 via the aging device 56 and the pallet 58. The worker performs various operations on the aging product 59 from the side of the side frame 80B where the roller driving device 55 is not provided.
Will not be interfered with.

The roller conveyor consisting of a pair of idle rollers 11A and 11B is basically the object to be conveyed 57 as described above.
Is carried out and the brake is applied,
Actually, the transfer control is performed by switching the valve device 61 based on the detection / non-detection of the presence detection devices 73B to 73G.

That is, the objects to be conveyed 57 are set in all the zones A to G.
When there is a load, the transported objects 57 are detected by the load detection devices 73B to 73G. As a result, as described above, the transmission roller 31 is separated from the idler roller 11A and is not driven, and the braking body 52 contacts the idler roller 11a, so that the zones A to G are subjected to the braking action.

In this state, the transported object 57 in the most downstream zone G is unloaded. Then, the presence detection device 73G in the zone G
Since there is no detection signal from the control device 71F corresponding to the zone F, the zone F and the zone G adjacent to each other in the transport direction do not have the transported object 57 in the downstream zone G. At the same time when the control signal 74F is output to 61, the valve device from the control device 71G corresponding to the zone G.
A control signal 74G is output to 61, whereby the double valve device 61
However, the supply hose 65 automatically switches to connect to the first supply / drain hose 62. Therefore, in both zones F and G, the braking body 52 moves away and the transmission roller 31 abuts to be in a driving state, so that the transported object 57 in the zone F is moved to the zone G.
Will be transported to.

When the transported object 57 is carried into the zone G and detected by the presence detection device 73G, the zone G becomes non-driving, and the braking body 52 acts on the idler roller 11a to transport the transported object 57. Will be subject to braking. Also the transported object
When 57 is carried out to the zone G, the detection signal from the presence detection device 73F in the zone F disappears, whereby the zone E and the zone F are brought into the driving state in the same manner as described above, and the zone E is transported. The object 57 is conveyed to the zone F. By repeating such an operation, the transported object 57 on the transport path 60 can be sequentially fed between the zones. Note that FIG. 6 shows a case where the transported object 57 in the zone C is transported to the zone D.

[0054]

According to the present invention having the above-described structure, the both side covers can be disposed on both sides by covering most of the rollers from above, and the space between the side covers can be completely covered by the intermediate section cover. As a result, the dust from the transported object can be received by each cover, the driving device, the transmission device, and the like are not adversely affected, and the surroundings can be cleaned and the appearance can be improved. Then, by using an intermediate cover having a width corresponding to the width of the machine, it is possible to easily deal with various widths of the machine.

Further, by separately mounting the rollers on the left and right side frames, it is possible to use a common roller for various machine widths, and it is not necessary to replace the rollers when the machine width is changed. Even when handled, the idling rollers of both groups can be lightened in a short length, the inertial rotational force can be weakened, and the drive unit and the main body frame can be downsized.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a transmission unit according to an embodiment of the present invention.

FIG. 2 is a vertical sectional front view of the idler roller side.

FIG. 3 is a partially cutaway side view of the same main part.

FIG. 4 is a vertical sectional front view of the bracket connecting portion.

FIG. 5 is a front view of the same.

FIG. 6 is a side view illustrating the same piping and control.

[Explanation of symbols]

 1 Main body frame 2A Locking groove 2B Locking groove 6A Cover locking groove 6B Cover locking groove 7A Cover receiving surface 7B Cover receiving surface 11A Idler roller 11B Idler roller 11a Idler roller 12A Through hole 12B Through hole 14A Roller shaft 14B Roller shaft 16A Nut 16B Nut 17A Locking part 17B Locking part 20 Transmission device 21A Support frame 21B Support frame 27 Spindle 30 Passive chain wheel 31 Transmission roller 40 Leg 44 Drive device 50 Braking device 70 Control circuit 80A Side frame 80B Side frame 81A bar 81B bar 82A bracket 82B bracket 101A side cover 101B side cover 103A locked part 103B locked part 105 abutting part 106A through hole 106B through hole 108A cover supporting part 108B cover supporting part 110 middle part cover 111A fitting part 111B fitting part

Claims (1)

Claim: What is claimed is: 1. A pair of left and right side frames are provided, and support frames are detachably provided on respective inner surface sides of the side frames which face each other, and these support frames are provided with freely rotatable rollers, On one side frame side, a drive device and a transmission device that is interlocked with the drive device and is connectable and separable to the roller on one side are provided, and a pair of left and right side covers that allow the upper part of the rollers to be exposed are provided, These side covers are configured such that an outer edge of the side cover can be engaged with and disengaged from the inner side of the side frame and an inner edge of the side cover can abut the transmission device from above.
A roller conveyor characterized in that an intermediate portion cover that can be fitted from above is provided between the inner portions of both side portion covers.