JPH0784246B2 - Roller conveyor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used, for example, when a work piece is conveyed via a pallet and a desired work is performed on the work piece in the conveying path. Roller conveyor.

2. Description of the Related Art Conventionally, as a roller conveyor of this type, a structure disclosed in, for example, JP-A-57-160807 has been provided.
In this conventional structure, a large number of rollers are provided on a main body frame (parallel rails) so as to freely rotate to form a conveyance path, and a case is provided on the main body frame side via a support bracket or the like. The case is provided with a pin along the axis of the roller, and a wheel and a sprocket that can simultaneously come into contact with the lower outer circumferences of a pair of adjacent rollers are integrally rotatably provided on the pin, and at the case side. A drive chain, which is supported and guided, is engaged with the sprocket.
A diaphragm for moving the pin up and down is provided between the case and the pin.

According to this conventional type, the drive chain rotates the wheel through the sprocket, and the rotation of the wheel is
This is transmitted to the pair of rollers in contact with each other, and the rotation of the rollers causes the conveyed object to be conveyed on the conveying path. Then, by controlling the supply and discharge to and from the diaphragm and moving the pin up and down, the drive mode in which the wheel is brought into contact with the roller,
By switching to the non-driving mode in which the wheels are separated from the rollers, the conveying force to the conveyed objects is cut off and controlled so that the conveyed objects do not collide with each other.

SUMMARY OF THE INVENTION According to the above-mentioned conventional type, since the whole is switched to a driving mode or a non-driving mode, when a certain zone is set as a working zone, a working operation of a transported object is performed in this working zone. Is not completed within a predetermined time, the entire flow is stopped or the raw material is conveyed to the next zone in an unprocessed state.

The purpose of the present invention is, when the transported object is absent in the downstream zone, it is possible to sequentially drive the transported object by forcibly driving this zone and an adjacent zone, but in a specific work zone, The point is to provide a roller conveyor which can be driven only when a setting operation is performed from the outside even if the downstream zone is absent.

Means for Solving the Problems To achieve the above object, the roller conveyor of the present invention is
A plurality of idler rollers, a transmission device facing each idler roller so as to be connectable and separable, and a drive device interlocked with these transmitters are provided. Separately, a valve device for connecting and disconnecting the transmission device group is provided for each zone, and two zones adjacent to each other in the transport direction are connected to each other so that the transmission device can be connected to the downstream zone when there is no object to be transported. Providing a control circuit connected to the valve device,
A predetermined zone of the plurality of zones is formed in the working zone, and the working zone is connected with the transmission device together with the downstream zone only when the set operation is performed from the outside under the above-mentioned condition of the connecting movement. When resetting,
Even if there is no transported object in the downstream zone, the transmission separates, and when there is no transported object in the working zone and there is a transported object in the upstream zone, the transmission devices in both zones will move. Therefore, a control circuit connected to each valve device is provided.

According to the structure of the present invention, by switching the valve device to one side, the transmission device is connected to the idler roller, thereby transmitting the driving force of the drive device to the idler roller and forcibly rotating the idler roller group. The transported object can be transported. Then, by switching the valve device to the other side, the transmission device is separated from the idler roller, so that the driving force of the drive device is not transmitted to the idler roller, and the idler roller group is not forcedly rotated. Is stopped.

In the zones other than the specific work zone under the condition of performing such an operation, when a zone in which the transported object does not exist occurs, this zone and the upstream zone are simultaneously driven, As a result, the transported object in the upstream zone can be sequentially fed to the downstream zone.

In a specific work zone, even if there is no transported object in the downstream zone, it will not be driven, and it will be driven with the downstream zone only when the set operation is performed from the outside, and when the reset operation is performed from the outside. , The transmission separates even if there is no transported object in the downstream zone, and the transmission devices in both zones are connected when there is no transported object in the working zone and there is a transported object in the upstream zone. Move
The transported objects in the upstream zone can be sequentially fed to the work zone.

Embodiment One embodiment of the present invention will be described below with reference to the drawings.

1 is a main body frame having a concave cross section, which is a pair of left and right side frames 1A, 1
B and a base frame 1C connecting the lower parts of the side frames 1A and 1B, and is installed at a predetermined height on the floor 3 via a plurality of legs 2 connected to the base frame 1C. It Both sides frame
L-shaped guide portions 4A, 4B are formed on the inner surfaces of 1A, 1B facing each other, and dovetail groove portions 6A, 6B for allowing sliding of the nut bodies 5A, 5B are further formed on the upper portions. On one side frame 1A, a pair of upper and lower guide rails 9 and 10 are arranged in the frame length direction on the inner surface side of the lower part thereof via mounting portions 7 and 8, respectively.

A pair of left and right idler rollers 11A,
The 11B group is arranged so as to be located inside the both-side frames 1A and 1B. Here, one idler roller group 11A is unitized with the transmission device 20 or the braking device 50. Ie transmission 20
As shown in FIGS. 5 and 7, the case-shaped support frame 21 made of resin is used as a main body, and the lower end of the substrate portion 22 is fitted to the guide portion 4A. By screwing the passed bolt 23 into the nut body 5A, 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 continuously provided from the inner surface of the lower half of the substrate portion 22 toward the inside is connected by the connecting plate portion 25. Further, a bearing hole portion 26 is formed at the lower end of the base plate 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 swing vertically. Then, an L-shaped plate portion 28 made of resin is inserted and attached between the free ends of the cover plate portion 24, and the outer end of the support shaft 27 is inserted into a vertical recess 29 formed in the vertical plate of the L-shaped plate portion 28. By fitting, the vertical swing range of the support shaft 27 is regulated.

A passive chain wheel 30 is rotatably attached to the support shaft 27, and a transmission roller 31 is externally fitted to a protruding boss portion of the passive chain wheel 30 to integrally rotate both of them 30 and 31. The transmission roller 31 is made of urethane rubber, and the outer periphery of the transmission roller 31 is the idle roller.
The lower part of the outer circumference of 11A is connectable and separable (free to contact and separate).

Cylinder device 32 that uses air to disconnect and connect
Is interposed between the cylinder rubber receiver 33 attached to the outer end of the support shaft 27 and the lateral plate of the L-shaped plate portion 28. Further L-shaped plate
A receiving plate 35 is continuously provided inwardly from the upper end of the vertical plate 28 through bolts 34, and the support shaft 27 is pushed down between the lower surface of the receiving plate 35 and the upper surface of the cylinder rubber receiver 33. Biasing compression spring
36 are installed. The transmission device 20 is configured by the above 21 to 36.

A bracket 37 extending upward is attached to the outer surface of the L-shaped plate portion 28 through a bolt 38.
The idler roller 11A is attached between the upper ends of 37 and the substrate portion 22. That is, the idler roller 11A is fitted onto the roller shaft 12 so as to be freely rotatable, and the washer 13 and the collar 14 are fitted on both sides. Then, a through hole 39 is formed on the substrate 22.
And a locking groove 40 that opens upward is formed in the upper portion of the bracket 37. Therefore, after inserting one end of the roller shaft 12 into the through hole 39, the other end is dropped into the locking groove 40 from above, and the support 41 externally fitted to the other end is fixed to the bracket 37 with a screw 42. By doing so, the idling roller 11A can be attached.

The drive device 44 interlocked with each transmission device 20 includes a chain 45 that meshes with each passive chain wheel 30 as shown in FIG.
Drive chain wheel 46, driven chain wheel 47, guide chain wheel 48,
The drive chain wheel 44 is connected to the motor 49, and the chain 45 is supported and guided by the guide rails 9 and 10.

The braking device 50 has the same configuration as the transmission device 20, and only different parts will be described below. That is, as shown in FIGS. 6 to 8, a non-passive chain wheel 51 is attached to the support shaft 27 in a freely rotatable manner, and a urethane rubber braking body 52 is attached to a protruding boss portion of the non-passive chain wheel 51. It is stuck. The non-passive chain ring
Reference numeral 51 is a toothless shape, and approximately half of the toothless portion 51a is opposed to the chain 45, and a stopper body 53 that engages between the teeth of the remaining toothed portion 51b is formed on the base 22. It can be freely inserted into and removed from the 43. Here, the idle roller on which the braking body 52 can freely abut is shown by 11a, and the cylinder device for moving the support shaft 27 upward is shown by 54.

As shown in FIG. 4, the other idler roller 11B is attached to the upper end of the bracket 17 via the roller shaft 15 and the fixture 16, and the lower end of the bracket 17 is engaged with the guide portion 4B. At the same time, the bolt 18 passing through the middle is screwed into the nut body 5B to be fixed to the side frame 1B. 19 indicates a cover.

A transport path 60 composed of the above-mentioned idle rollers 11A, 11B, and 11a.
Are divided into a plurality of zones in the route direction. That is, in the embodiment, as shown in FIGS. 1 to 3, the first standby zone A, the first working zone B, the second standby zone C, the second working zone D, the second working zone D It is divided into a first storage zone E, a second storage zone F, and a third storage zone G. 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 roller 11A.

Each of the zones A to G is separately connected / disconnected and provided with a valve device 51 for reversibly connecting / disconnecting the braking device 50 and the transmission 20. That is, the cylinder device of the transmission 20
A first supply / discharge hose 62 connected to the 32 group and a second supply / discharge hose 63 connected to the cylinder device 54 of the braking device 50 are supplied from a supply source 64 via a 5-port electromagnetic valve device 61. 65
It is reversibly connectable with.

66 is a regulator and 67 is a silencer. Transported object
57 includes a pallet 58 and a workpiece 59 placed on the pallet 58, but the pallet 58 may not be used.

Among the zones A to G, in the zones A, C and E to G excluding the specific work zones B and D, two zones adjacent to each other in the transport direction are transmitted to the downstream zone when the transported object 57 is absent. apparatus
In the specific work zones B and D, the transmission device 20 is connected and moved together with the downstream side zones C and E only when the push button 77 is set from the outside under the above-mentioned connection movement conditions. Then, when the reset button 89 is reset from the outside, even if the transported object 57 is absent in the zones C and E on the downstream side, the transmission device 20 separates, and the transported objects 57 are absent in the working zones B and D. In addition, a control circuit 70 connected to each valve device 61 is provided so that the transmission devices 57 of both zones B, D, A, and C are connected to each other when the transported object 57 is present in the upstream zones A and C. There is.

That is, the control devices 71A, 71B, 71 are associated with the zones A to G, respectively.
C, 71D, 71E, 71F, 71G are arranged, and these control devices 71A to 71
The Gs are connected to each other and to the power supply 72 in series.
And each zone B to G except the first standby zone A which is the most upstream
In-car load detection devices 73B, 73C, 73D, 73E, 73F, 73G are arranged.

Of the presence detection devices 73B to 73G, the first work zone B
And the presence detection devices 73B and 73C corresponding to the second standby zone C are connected to the control devices 71A and 71B corresponding to the first standby zone A and the first work zone B via the shared operation determination device 74,
Then, the presence detection devices 73D and 73E corresponding to the second work zone D and the first storage zone E are controlled by the control device 71C corresponding to the second standby zone C and the second work zone D via the shared operation determination device 75. , 71D is connected. Further, the presence detection device 73F corresponding to the second storage zone F is connected to the control device 71E corresponding to the first storage zone E, and the presence detection device 73F corresponding to the third storage zone G is also included.
G is connected to the control device 71F corresponding to the second storage zone F.

On the outer surface of the side frame 1B on the side opposite to the side where the drive devices 44 are arranged in the main body frame 1, operation boxes 78 and 79 having push buttons 76 and 77 are provided, and these operation boxes 78 and 79 are It is connected to the operation determination devices 74 and 75.

The control devices 71B and 71D in the work zones B and D respectively include the presence detection devices 73C and 73C in the second standby zone C and the first storage zone E, respectively.
Under the condition that 73E is not detected, pushbuttons 76,7 on operation box 78,79
The corresponding valve device 6 is operated to connect both working zones B and D with the adjacent zones C and E on the downstream side by operating 7.
1 is configured to provide control signals 80B-80E. Control devices 71A, 71C, 71E to 71G for other zones A, C, E to G
Is a corresponding valve device for connecting the current zone and the upstream zone when the downstream zones B, D, E to G are not detected.
61 is configured to provide control signals 80A-80G.

The presence detection devices 73A to 73G include a reflecting mirror and a photoelectric switch. That is, as shown in FIG. 4, one side frame 1A
Holding plate that extends upward via bolts and nuts 81 on the outer surface of the
82 is provided, and a reflecting mirror 83 is attached to the upper part of the holding plate 82. Here, the reflecting mirror 83 is set so as to face the lower inner surface side of the other side frame 1B. A switch bracket 84 is attached to the lower inner surface of the other side frame 1B, and a photoelectric switch 85 is attached to the switch bracket 84 so that the angle can be changed.

Support plates 87 are attached to the upper ends of the side frames 1A and 1B via bolts and nuts 86, and guide bodies 88 are provided on the inner surface sides of the support plates 87 facing each other.

Next, the work of transporting the transported object 57 in the above embodiment will be described.

Zones D and E in FIGS. 4, 5, 7 and 3
Switches the valve device 61 so as to connect the first supply / discharge hose 62 to the supply hose 65, and swings the support shaft 27 upward against the pressing biasing force of the compression spring 36 due to the expansion of the cylinder device 32. 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. Further transmission roller
31 is in contact with the lower part of the outer periphery of the idler roller 11A, forcibly rotating the idler roller 11A group. As a result, the transported object 57 on the transport path 60 is supported between the groups of both idler rollers 11A and 11B, receives the transporting force by the forced rotation of the idler roller 11A on one side, and both side surfaces are guided. 88
The sheet is conveyed on this conveying path 60 in the state of being guided to.

At this time, since the second supply / discharge hose 63 is open and the cylinder device 54 is not in operation, the support shaft 27 is swung downward by the pressing biasing force of the compression spring 36, as shown in FIG. The control body 52 is separated 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 by zones A to C, F, G in FIG. 3, the valve device 61 is switched to connect the supply hose 65 to the second supply / discharge hose 65, and the extension of the cylinder device 54 is performed as shown in FIG. The support shaft 27 is swung upward against the pressing biasing force of the compression spring 36, and its braking body 52 is brought into contact with the corresponding idler roller 11a from below, thereby allowing the idler roller 11a to move freely. It is possible to prevent the roll, so that the transported object 59 can be braked to prevent the transport.

When the braking body 52 is brought into contact with the brake body 52 in this manner, the first supply / discharge hose
62 is opened and the cylinder device 32 is deactivated,
The support shaft 27 is swung downward by the pressing force of the compression spring 36,
As shown by an imaginary line Q in FIG. 7, the transmission roller 31 is separated from the idler roller 11A so that the idler roller 11A group is not driven.

In the presence detection devices 73B to 73G shown in FIG. 4, the red light projected from the photoelectric switch 85 is reflected by the reflecting mirror 83. Here, when there is no object to be transported 57, the reflected light beam enters the photoelectric switch 85, and becomes a non-detection state. And the transported object 57
Is present, the red light is blocked by the transported object 57 and does not reach the reflecting mirror 83, and since there is no reflected light beam, the photoelectric switch 85 is detected.

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

That is, as shown by the phantom lines in FIGS. 1 and 2, when the transported objects 57 are loaded in all the zones A to G, these transported objects 57 are detected by the loaded detection devices 73B to 73G. There is.
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 working operation is performed by the worker 90 from the side opposite to the side on which the drive device 44 is arranged, that is, from the outside of the idling roller 11B group. This is done for the work piece 59 that is stationary in both work zones B and D. As shown by the phantom line in FIG. 2, the drive device 44 can be arranged so as to approach a structure 69 such as a wall.
It is safe to separate them from the drive unit 44.

After the desired work is completed, the transported object 57 in the third storage zone G is removed. Then, since the detection signal from the load detection device 73G of the third storage zone G disappears, that is, the second storage zone F and the third storage zone G which are adjacent to each other in the transport direction are covered by the third storage zone G on the downstream side. Since the transported object 57 is absent, the control device 71F corresponding to the second storage zone F outputs the control signal 80F to the valve device 61, and at the same time, the control device 71G corresponding to the third storage zone G outputs the valve device. A control signal 80G is output to 61, which causes both valve devices 61 to automatically switch to connect the supply hose 65 to the first supply / drain hose 62.

Therefore, in both zones F and G, the braking body 52 moves away from each other and the transmission roller 31 abuts to be in a driving state, whereby the transported object 57 in the second storage zone F is moved to the third storage zone G. Will be transported. When the transported object 57 is carried into the third storage zone G and detected by the presence detection device 73G, the third storage zone G is not driven, and the braking body 52 acts on the idler roller 11a. Transported goods 5
7 will be braked.

Further, since the transported object 57 is carried out to the third storage zone G, the detection signal from the load detection device 73F in the second storage zone F disappears, which causes the first storage zone E and the second storage zone E to operate in the same manner as described above. The storage zone F is brought into a driving state, and the transported object 57 in the first storage zone E is
To the second storage zone F. Such an operation is also performed between the first standby zone A and the first work zone B and between the second standby zone C and the second work zone D. However, for example, in the second work zone D, both zones D, E are not driven even if there is no transported object 57 in the downstream first storage zone E and the detection signal from the presence detection device E disappears.

When the worker 90 in the second work zone D presses the push button 77 of the operation box 79 after finishing the processing on the workpiece 59, the control devices 71D and 71E are operated according to the instruction from the operation determination device 75, Control signals 71D and 71E are applied to the valve device 61 to perform switching operation, whereby both zones D and E are brought into a driving state as shown in FIG. It will be transported to the storage zone E. The same applies to the first work zone B.

Further, when the reset button 89 of the operation box 78, 79 is pressed, even if the workpiece 59 is absent in the downstream zones C, D, the transmission device 20 separates and is not transported as described above,
When the work piece 59 is absent in the work zones B and D and the work piece 59 is present in the upstream zones A and C, the transmission devices 20 in both zones are connected and the work zones B and D are separated from each other. Zones A, C, E
It can be operated in the same manner as ~ G.

As described above, when the braking body 52 is brought into contact with the idler roller 11a from below, the braking body 52 tries to rotate around the support shaft 27 together with the non-passive chain wheel 51. Since the stopper body 53 supported by is engaged between the teeth of the toothed portion 51b of the non-passive chain wheel 51, it can be prevented. Also stopper body
53 is extracted, the non-passive chain wheel 51 is rotated around the support shaft 27 in accordance with the tooth pitch, and then the stopper body 53 is engaged between the other teeth, so that the non-passive chain wheel 51 is integrated. The braking body 52 is rotated by the same amount, and the braking body 52 for the idler roller 11a is thereby rotated.
The contact position of can be changed in the circumferential direction.

EFFECTS OF THE INVENTION According to the present invention having the above-described configuration, by connecting or disconnecting the transmission device to the idler roller by switching the valve device, the idler roller is forcibly rotated to convey the conveyed object, and the forced rotation is performed. It is possible to stop the conveyance and stop the conveyance of the conveyed object. Under the conditions where such operation is performed, in the zones other than the specific work zone, when there is a zone where there is no transported object, this zone and the upstream zone are driven at the same time. Thus, the transported object in the upstream zone can be sequentially fed to the downstream zone.

Moreover, in a specific work zone, even if there is no transported object in the downstream zone, it is not driven, and it can be driven together with the downstream zone only when the set operation is performed from the outside. The transmission device can be separated even if there is no transported object in the zone on the side, and when there is no transported object in the working zone and there is a transported object in the upstream zone, the transmission devices in both zones are connected and moved. Thus, the transported object in the upstream zone can be sequentially fed to the work zone.

As a result, it is possible to allow time to stop in the work zone, so that even if it takes time to work in the work zone, the entire flow is not stopped, and it can be conveyed to the next zone in an unworked state. Instead, it is possible to provide a flexible roller conveyor as a whole.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a partially cutaway side view of the whole, Fig. 2 is a plan view of the same, Fig. 3 is a side view for explaining piping and control, and Fig. 4 is a vertical section. Front view, FIG. 5 is a vertical sectional front view of the transmission device portion, and FIG. 6 is a vertical sectional front view of the braking device portion,
FIG. 7 is a partially cutaway side view of the main part, and FIG. 8 is a vertical sectional front view of the main part in FIG. 1 ... Main body frame, 11A, 11B, 11a ... Idler roller, 20
...... Transmission device, 27 …… Spindle, 30 …… Passive chain wheel, 31 …… Transmission roller, 32 …… Cylinder device, 44 …… Driving device, 45 ・ ・ ・
... Chain, 49 ... Motor, 50 ... Braking device, 51 ... Non-passive chain wheel, 52 ... Braking body, 53 ... Stopper body, 54 ... Cylinder device, 57 ... Transported object, 58 ... Pallet, 59 ... Workpiece, 60 ... Conveyance path, 61 ... Valve device, 70 ... Control circuit, 71A-71G ... Control device, 73B-73G ... In-vehicle detection device, 74, 75 ... Operation determination device, 76, 77 ... Push button, 7
8, 79 ... Control box, 80A-80G ... Control signal, A ... First standby zone, B ... First working zone, C ... Second standby zone, D ... Second working zone, E ... ... 1st storage zone, F ... 2nd storage zone, G ... 3rd storage zone.

Claims (1)

[Claims] 1. A conveyance path comprising a group of idler rollers, comprising a plurality of idler rollers, a transmission device facing each idler roller in a freely connectable and separable manner, and a drive device interlocked with these devices. Is divided into a plurality of zones, and a valve device for connecting and disconnecting the transmission device group is provided for each zone. Two zones adjacent to each other in the conveyance direction are transmission devices when there is no object to be conveyed in the downstream zone. Is provided with a control circuit connected to each valve device so as to be connected to each other, and a predetermined zone among a plurality of zones is formed in the working zone, and this working zone is set when an external set operation is performed under the condition of the connecting movement. Only when the transmission device is connected together with the downstream zone and the reset operation is performed from the outside, the transmission device separates even if there is no transported object in the downstream zone, and there is no transported object in the working zone. Upstream zo Roller conveyors, characterized in that both zones of the transmission device when the conveyed object is present is provided with a control circuit connected to each valve device to connect moving to.