JPS5837203B2 - Transfer control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an object transfer control device, and more particularly to a control device for changing the speed of a portion of a conveyor transfer process.

For example, parts transported by a conveyor are transported at a relatively high speed in a certain processing area, and at normal speed in other areas, for processing such as painting. It may be necessary to transport at relatively low speeds for transport.

The present invention relates to a conveyor transfer speed control device to meet these needs.

The present invention is based on a series of transfer systems in which objects to be transferred are transferred from a low-speed conveyor to a high-speed conveyor and then back to a low-speed conveyor, and to prevent damage caused by mutual collision regardless of the length of the objects to be transferred. The purpose is to

The present invention further prevents damage to the object or the conveyor due to friction between the object and the conveyor even when the transfer member is placed between conveyors having different speeds.

The present invention further provides a configuration in which the length of the high/low speed switchable region of the first conveyor can be easily changed in accordance with the length of the conveyed object.

An example of the implementation of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, a transfer device 1 consisting of a roller conveyor is connected to a first low-speed roller conveyor A. l, - and a third low-speed drive conveyor C on the downstream side.
and a second roller conveyor B provided between the low-speed drive conveyors A and C, at least a portion of which can be switched between high and low speeds, and an object processing device is disposed in the middle of the second roller conveyor B. A device 2 is provided.

The rollers 3, 4, . . . of the conveyor A, and the rollers 5, 6, 7, .

A first detector PH1 is provided between the conveyor A and the conveyor 7B to detect that the object to be transferred has moved to the conveyor B.

Furthermore, a second detector PH2 for detecting that an object has passed through the processing device 2 is provided at a predetermined position downstream of the processing device 2 at the rear of the second roller conveyor B. A third detector PH3 is provided to detect that an object has moved to the third conveyor C between the two.

The name detectors PH1, PH2, PH3 are constituted by any detection means capable of detecting whether an object is present thereon, such as a limit switch or a photoelectric element.

When conveyor B is running at high speed, conveyor A and conveyor B
In order to prevent damage due to abrasion caused by subsequent objects that straddle the conveyor B, one end of the shaft of the roller 8 at the upstream end of the conveyor B is connected to a common low-speed drive source with the conveyor A via a cam clutch 11 that can be overrun. is connected to.

Furthermore, the rows 25, 6 at the upstream end of the conveyor C are also provided with cam clutches 12, 13 that can be overrun.

The control circuit 14 connected to the detectors PH1, PH2, PH3 and the rollers 9, 10 of the conveyor B are shown at the bottom of FIG.
・Control circuit 1 installed in the drive system (excluding roller 8)
High-speed drive clutch HO that operates according to the output from 4
and a low-speed drive clutch LO are shown.

Next, referring to the diagram at the top of FIG. 1 and the flowchart in FIG. 2 showing the state of transport of parts, the present invention will be explained with reference to the case where the length of the object to be transported is relatively long and the distance between them is close. The operation of this device will be explained.

When an instruction to start the transfer device 1 is issued, the starting circuit S turns on the low speed clutch LO, thereby starting the conveyor B.
The rollers 9 and 10 are driven at low speed together with the other conveyors A and C.

Next, (I) When the front end of the object G1 to be transferred is detected by the first detector PH1, the starting circuit S is turned OFF, but at the same time a direct ON signal is sent to the low speed clutch LO, so that the conveyor B continues to drive at low speed.

(n) Next, when the rear end of the object G1 passes the first detector PH1, if the third detector PH3 is in the OFF state, that is, there is no object above, the low speed clutch LO is turned OFF.
The F signal is sent, and at the same time, the ON signal is sent to the high-speed clutch HC, and therefore the rollers 9, 10 of conveyor B...
roller? ) starts high-speed driving.

At this time, the object G1 is moved to the rollers 9, 10, which are being driven at high speed.
... and the roller 8 which is driven at low speed, but since the roller 8 is capable of overrunning, the row 28 temporarily moves at high speed when the rear end of the object G1 passes. overrunning.

When the rear end of the object G1 finishes passing, the roller 8 returns to its original low speed drive.

(III) Even if the front end of the next object G2 reaches the first detector while the object G1 is being fed at high speed on the conveyor B, if the front end of the object G2 reaches the high speed drive roller 9K in 1. The rollers 9, 10, . . . of conveyor B continue to drive at high speed.

(2) When the object G1 is transported at high speed and passes through the processing device 2, and its front end is detected by the second detector PH2, an OFF signal is sent to the high speed clutch HC.

As a result, the rollers 9, 10, . . . of the conveyor B are in a state of idle rotation, and the object G1 advances by inertia while decreasing its speed.

(Even if the object G1 enters the conveyor C before its speed is sufficiently reduced, no scratches will occur due to the action of the rolls 5 and 6 that can be run.

) (V) When the front end of the object G1 is detected by the third detector PH3, the low speed clutch LC is turned on and the rollers 9, 10, . . . of the conveyor B resume low speed driving.

(■ At 1 when the rear end of the object G1 is detected by the third detector PH3, that is, at 1 when the object G moves to the conveyor C,
Even if the rear end of the object at the rear end is detected by the first detector PH, the control circuit 14 acts so as not to turn on the high speed clutch.

In this way, by configuring the roller 8 at the upstream end of the conveyor B to be able to overrun and to be driven at a constant low speed, the following object G2 is transported on the conveyor B while the preceding object G1 is being conveyed at high speed. Even if it reaches the roller 8, it will not be damaged by abrasion.

Therefore, objects can be conveyed on the conveyor A with very close intervals between them.

The number of rollers that can be overrun and are constantly driven at low speed can be selected appropriately depending on the distance between the rollers and the length of the object.

When sending an object shorter than the object shown in Figure 1, if the positions of the detectors, etc. are the same, the distance L calculated by subtracting the length of the object from the distance between the first detector PH1 and the second detector PH2 will be longer. Therefore, if the high-speed conveyance time becomes long and the distance between the objects is not widened, there is a risk that the next object will enter the rollers 9, 10, etc. that are being driven at high speed and cause scratches.

Therefore, if the length of the object is short, it is desirable to change the area of the conveyor B according to the length so that the above-mentioned distance L is constant.

An example of a conveyor configured in this way will be explained with reference to FIGS. 3 and 4.

As shown in FIG. 3, a cam clutch 31 capable of overrunning is provided at one end of the rollers 21, 22, . . . 30 over a range that changes the upstream end of the conveyor B.
,... 40 are provided and connected to the drive system (not shown) of the upstream constantly low-speed conveyor A.
...30 is provided with clutches 41, ..., 50 that can be disengaged by a simple operation such as a lever operation, and a drive system (not shown) that can switch between high and low speeds is connected via these clutches. connected.

and a first detector PH1 that defines the upstream end of the conveyor H.
Alternatively, a single detecting means that is easy to replace may be used, or a plurality of detectors may be provided in advance at a plurality of positions, and one of them may be selectively set as the detector PH1.

When the object to be conveyed is the longest, the detector PH1 is set immediately upstream of the roller 21 as shown in FIG. By separating them, the roller 211 becomes the area of the conveyor B, and thereby the upstream becomes the conveyor A.

When the twisted object to be conveyed is short, the detector PH1 is set on a roller downstream of the roller 21, for example, immediately upstream of the roller 30 as shown in FIG.
By disengaging in advance the clutches 41, 42, . . . , 50 connected to the drive system that can switch between high and low speeds, the rollers 301 become the area of the conveyor B.
Conveyor A is upstream from that point.

So, the tip of the object is detected by the second detector PH2? When the object is released, the high-speed drive is stopped, and the object is then transferred by inertia, but since the inertia varies depending on the size and weight of the object, it is possible to change the positional relationship between the second detector and other detectors as appropriate. can.

If the distance between the two objects is sufficiently large, the first detector P
It may also be possible to switch between high and low speeds from a roller immediately downstream of H.

Further, as for the conveyor, it is necessary to use a roller conveyor in the overrunning portion, but in other areas, a belt conveyor, a multi-strip parallel belt conveyor, or a multi-strip parallel chain conveyor can also be used.

In addition, as mentioned above, the detector is installed at a predetermined detection position on the conveyor to sense when an object comes there, and other detectors are installed not at the predetermined detection position but at other positions. It is also possible to use a timer or the like to detect the arrival of an object at a predetermined detection position based on the output of the device.

In this case, it is assumed that the detector is substantially located at the detection position.

With the above-described device, there is no risk of objects colliding with each other, regardless of the length of the conveyed objects.

When using one or two conveyors, make sure that both conveyors have the same speed or that one conveyor is on a roller section that can overrun to prevent scratches caused by friction between the rollers and objects. be able to.

Furthermore, by changing the area of the second conveyor B according to the length of the object to be conveyed, it is possible to prevent the front end of the following object from coming into contact with the conveyor during high-speed 1 operation and being scratched.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram for explaining the structure of a transfer control device according to the present invention and the conveyance state of a conveyed object. FIG. 2 is a partial flow chart and a partial block diagram for explaining the operation of the transfer control device according to the present invention. FIGS. 3 and 4 are diagrams for explaining how to change the second conveyor area. 1... Transfer device, A, B, 0... First, second and third conveyors, PH1, PH2, PH3...
- first, second and third detectors respectively;

Claims (1)

[Claims] 1 A first low-speed drive conveyor, a second conveyor provided downstream of the first conveyor and at least a portion of which can be switched between high and low speed drive, and a third conveyor provided immediately downstream of the second conveyor. a low-speed driving conveyor; a first detector for detecting that an object to be transferred has moved onto the second conveyor; and a first detector for detecting that the object has reached a predetermined position on the second conveyor. a second detector, a first detector for detecting that the object has moved to a third conveyor, and a second detector for detecting that the object has moved to a third conveyor;
and when the object moves from the first conveyor to the second conveyor in response to the output of the third detector, the second conveyor is switched to high-speed drive, and the object is detected by the second detector. The drive of the second conveyor is stopped and the second conveyor is allowed to rotate freely, and then the second conveyor is switched to the same low speed drive as the first and third conveyors by the third detector. At 1, the object moves to the third conveyor.
A transfer control device comprising: a control circuit having a function of prohibiting high-speed switching of a conveyor;