JPH0643048Y2 - Roller conveyor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial field of application 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 is 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 periphery of a pair of adjacent rollers are integrally rotatably provided on the pin. A drive chain supported and guided on the side 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.

Problems to be Solved by the Invention According to the above-mentioned conventional type, since each roller is mounted so as to be freely rotatable, the roller is inertially rotated immediately after the wheels are separated from each other to be in the non-driving mode. The transported object runs freely and collides with the transported object stopped in front. Further, since the roller is long, it has a strong inertial rotation when the diameter is large. Therefore, a large number of stopper devices are required to accurately stop the transported object, and the pallet must have a special shape such as one having a notch. Further, since a long roller group having a large diameter is rotated, the driving device is increased in size.

An object of the present invention is to provide a roller conveyor that can brake the conveying rollers that try to rotate by inertia immediately after shifting from the driving mode to the non-driving mode, and further reduce the weight and size of the roller group and the driving device. There is a point to do.

Means for Solving the Problems In order to achieve the above object, the roller conveyor of the present invention is
A pair of left and right idler roller groups are arranged on the main body frame side, and the conveyance path composed of these idler roller groups is divided into a plurality of zones. Each idle roller group on one side has at least one idle roller group. A valve device having a braking device connectable and separable to the rolling roller and a transmission device simultaneously connectable to and separable from the remaining idler roller, and reversibly connecting and disconnecting the braking device and the transmission device for each zone. In addition, the drive device interlocking with each transmission device is arranged on one side across the zones, and two adjacent zones in the conveyance direction are the transmission devices when there is no object to be conveyed in the downstream zone. A control circuit connected to each valve device is provided for connection.

According to the configuration 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. Let At this time, the braking device is separated,
The idler roller is not braked. As a result, the object to be conveyed supported between the left and right idler roller groups can be conveyed by the forced rotational force of one idler roller group. Then, by switching the valve device to the other side to separate the transmission device from the idler roller, the driving force of the drive device is not transmitted to the idler roller, and the idler roller group is not forcedly rotated. At this time, the braking device is connected to the idler roller, thereby braking the idler roller and stopping the inertial rotation. When a zone in which there is no transported object is generated under the condition of performing such an operation, this zone and the upstream zone are driven at the same time. Can be forwarded to the zone. By dividing the idler roller into left and right groups, the idler roller facing the transmission device and the braking device can be made lighter in a short length, the inertial rotational force can be weakened, and the drive device can be downsized.

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

Reference numeral 1 is a main body frame having a cross-sectional shape.
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. A pair of guide rails 9 and 10 are arranged in the frame length direction on the inner surface side of the lower portion of one side frame 1A 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 portion 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 is formed at the lower end of the substrate 22.
26 is formed, and the inner end of a support shaft 27 in the left-right direction is fitted into the bearing hole 26 so that the support shaft 27 can swing up and down.
The resin-made L-shaped plate portion 28 is provided between the free ends of the cover plate portion 24.
Is attached by inserting, and the outer end of the support shaft 27 is fitted into a vertical recess 29 formed in the vertical plate of the L-shaped plate portion 28.
The vertical swing range of the support shaft 27 is restricted. 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 so that both of the rollers 30, 30
Is freely rotatable. 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. The cylinder device 32 that uses air to disconnect the connection is
It is interposed between the cylinder rubber receiver 33 attached to the outer end of the and the horizontal plate of the L-shaped plate portion 28. Further, a receiving plate 35 is continuously connected inward from the upper end of the vertical plate of the L-shaped plate portion 28 via a bolt 34, and a supporting shaft is provided between the lower surface of the receiving plate 35 and the upper surface of the cylinder rubber receiver 33. A compression spring 36 that presses and urges 27 is interposed. 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 via a bolt 38.
The idler roller 11A is mounted between the upper end of the base plate 22 and the upper end of the base plate 22. That is, the idler roller 11A is fitted onto the roller shaft 12 so as to be freely rotatable, and further, the washer 13 and the collar are provided on both sides.
14 is fitted. Then, a through hole 39 is formed in the upper portion of the base plate portion 22, and an upwardly opening locking groove 40 is formed in the upper portion of the bracket 37. Therefore, by inserting one end of the roller shaft 12 into the through hole 39, dropping the other end into the locking groove 40 from above, and fixing the support 41 externally fitted to the other end to the bracket 37 with the screw 42. The idle 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. 43 can be inserted and removed freely. 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.

A transport path 60 composed of the above-mentioned idle rollers 11A, 11B, and 11a.
Are divided into zones in the direction of their path. That is, in the embodiment, as shown in FIGS. 1 to 3, in order from the upstream side to the downstream side, the first standby zone A, the first work zone B, the second standby zone C, the second work zone D, and the first standby zone A. It is divided into a storage zone E, a second storage zone F, and a third storage zone G. In each zone A to G, the braking device 5 faces at least one idler roller 11a.
0 is provided, and the transmission device faces the remaining idler roller 11A.
20 are provided. Each of the zones A to G is connected and separated separately, and a valve device 61 for connecting and disconnecting the braking device 50 and the transmission device 20 as much as possible at that time is provided. That is, the first supply / discharge hose 62 connected to the cylinder device 32 group of the transmission device 20.
And a second supply / discharge hose 63 connected to the cylinder device 54 of the braking device 50 are configured to be connected as much as possible to a supply hose 65 from a supply source 64 via a 5-port electromagnetic valve device 61. I am doing it. 66 is a regulator and 67 is a silencer. The transferred object 57 includes a pallet 58 and a processed object 59 placed on the pallet 58, but the pallet 58 does not have to be used. 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 controller 71A, corresponding to each zone A to G,
71B, 71C, 71D, 71E, 71F, 71G are provided, and these control devices 7
1A to 71G are connected to each other and to the power supply device 72 in series. And each zone B except the first standby zone A which is the most upstream
.. to G are provided with the presence detection devices 73B, 73C, 73D, 73E, 73F, 73G, and these presence detection devices 73B to 73G are connected to the control devices 71A to 71F in the adjacent upstream zones. For example, the presence detection device 73B is connected to the control device 71A, and the 73C is connected to 71B. Then, each control device 71A ~ 71G, when the downstream load detection device is not detected, to connect the zone and the upstream zone, to the corresponding valve device 61 control signal 74A, 74B ,.
Configured to give 74C, 74D, 74E, 74F, 74G.

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
A holding plate that extends upward through the bolts and nuts 75 on the outer surface of the
A reflecting mirror 77 is attached to the upper part of the holding plate 76 while providing the 76. Here, the reflecting mirror 77 is set so as to face the lower inner surface side of the other side frame 1B. A switch bracket 78 is attached to the lower inner surface side of the other side frame 1B,
A photoelectric switch 79 is attached to the switch bracket 78 so that the angle can be changed.

A support plate 81 is attached to the upper ends of both side frames 1A and 1B via bolts and nuts 80, and guide bodies 82 are provided on the inner surfaces of the support plates 81 facing each other. Reference numeral 83 denotes a cover, 84 ... Other structures such as walls.

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

Zones C and D 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, the transmission roller 31 is in contact with the lower portion of the outer periphery of the idler roller 11A, thereby 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.
In the state of being guided by 82, it will be conveyed on this conveying path 60. At this time, the second supply / discharge hose 63 is open, and the cylinder device 54 is inoperative, so the compression spring
The support shaft 27 is swung downward by the pushing urging force of 36 to separate the braking body 52 from the idle roller 11a, as shown in FIG. 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, B, E to G in FIG. 3, the valve device 61 is switched to connect the supply hose 65 to the second supply / discharge hose 63, 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 brought into contact with the idler roller 11a corresponding to the braking body 52 from below, whereby the idler roller 11a moves 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 cylinder body 32 in this manner, the first supply / discharge hose 62 is opened and the cylinder device 32 is deactivated, and the pressing force of the compression spring 36 presses the support shaft.
27 is swung downward so that the transmission roller 31 is separated from the idler roller 11A as shown by the phantom line Q in FIG. 7, and the idler roller 11A group is made non-driven.

In the presence detection devices 73B to 73G shown in FIG. 4, the red light projected from the photoelectric switch 79 is reflected by the reflecting mirror 77. Here, when there is no object to be transported 57, the reflected light beam enters the photoelectric switch 79 to enter the non-detection state. When the transported object 57 is present, the red light is blocked by the transported object 57 and does not reach the reflecting mirror 77, and since there is no reflected light beam, the photoelectric switch 79 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 worker 9 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.
Processing work by 0 is performed. This is done for the work piece 59 that is stationary in both work zones B and D.

After the desired work is completed, the transported object 57 in the third storage zone G is removed. Then, since there is no detection signal from the load detection device 73G in the third storage zone G, 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 74F 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 74G is output to 61, whereby both valve devices 61 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 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 position.
It will be transported to the storage zone G. Transported object 57
Is loaded into the third storage zone G and the presence detection device 73G
As a result, the third storage zone G becomes non-driving, and the braking body 52 acts on the idler roller 11a so that the transported object 57 receives the braking action. 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 and the storage zone F are driven to move the transported object 57 in the first storage zone E to the second position.
Transport to storage zone F. By repeating such operations, the transported object 57 on the transport path 60 can be sequentially fed between the zones. Note that FIG. 3 shows a case where the transported object 57 in the second standby zone C is transported to the second work zone D.

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.

Effect of the Invention According to the present invention having the above-described configuration, immediately after the driving mode is changed to the non-driving mode, it is possible to connect the braking device to the idler roller that tries to inertially rotate, apply a brake, and stop the inertial rotation. As a result, the free run of the transported object can be eliminated, and the collision with the transported object stopped ahead can be prevented. At that time, by dividing the idler roller into the left and right groups, it is possible to reduce the weight of the idler roller facing the transmission device and the braking device in a short length.
The inertial rotation force can be weakened so that the braking action can be further ensured, and the drive device can be downsized.
Due to these, the transported object can be accurately stopped without providing a stopper device, and the pallet and the like need not have a special shape. Then, when a zone in which there is no transported object is generated under the condition of performing the above-described operation, this zone and the upstream zone are driven at the same time. It is possible to progressively feed to the zone, and even a lightweight transported object can be progressively fed without causing flow defects.

[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 cross-sectional plan 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 ... Transport path, 61 ... Valve device, 62 ... First supply / drain hose, 63 ... Second supply / drain hose, 65 ... Supply hose,
70 ... Control circuit, 71A-71G ... Control device, 73B-73G ...
In-load detection device, 74B to 74G ... Control signal, A ... First waiting zone, B ... First working zone, C ... Second waiting zone, D ... Second working zone, E ... First Storage zone, F ... Second storage zone, G ... Third storage zone.

Claims (1)

[Scope of utility model registration request] 1. A pair of left and right idler roller groups are disposed on the side of the main body frame, and a conveyance path composed of these idler roller groups is divided into a plurality of zones.
At least one idler roller has a braking device connectable and separable, and a remaining idler roller has a transmission device simultaneously connectable and separable, and the braking device and the transmission device are reversibly provided for each zone. A valve device for connecting and disconnecting is provided, and a drive device that interlocks with each transmission device is arranged on one side across the zones, and two adjacent zones in the transport direction have no downstream objects in the downstream zone. A roller conveyor provided with a control circuit connected to each valve device so that the transmission device can be connected at the time of.