JPH0741967B2 - Aki Conveyor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to an accumulator capable of stocking conveyed objects on a conveyor.

(Prior art and its problems) For example, as an accumulator that conveys a plate-shaped object to be conveyed such as a printed circuit board between various processes, a wicket-type conveyor with an impeller such as a water turbine is conventionally known. ing. However, in such a conventional accumulation conveyor, the number of stocks is constant, and it is necessary to perform supply and discharge at the same timing. In other words, if they are not supplied at the same time when they are discharged, vacant seats will be available in the stock position, and the number of stocks will decrease. Therefore, the stock function could not be fully utilized.

(Means for Solving the Problems) The present invention is directed to a plurality of endless chains of downward length that have blades 49, 50 for carrying a plate-shaped object 51 to be conveyed.
12 and the first drive motor 22 that meshes with the chain 12.
The first sprocket 13 driven to rotate intermittently by
And is meshed with the chain 12 at the rear of the chain 12 and is intermittently rotatably driven in the same direction as the first sprocket 13 by the second drive device electric motor 29 and within a certain range with respect to the first sprocket 13. Moving frame that can approach and separate
A second sprocket 14 supported on 15 and a biasing cylinder device 48 for biasing the second sprocket 14 away from the first sprocket 13 with a constant biasing force.
And a large-diameter pulley 8 which is concentric with the second sprocket 14, is rotatable, and has a slightly small diameter, and immediately after that, a small-diameter pulley 6 whose upper end is slightly higher than the bottom of the large-diameter pulley 8, and blades 49 of the chain 12. The supply belt conveyor 2 for supplying the conveyed object 51 to the 50, and the discharge belt conveyor 3 for receiving the conveyed object 51 are provided immediately below the first sprocket 13 and the first sprocket 13 and the second sprocket 13 are provided. The accumulation conveyor is characterized in that the number of stocks can be varied by stocking the objects to be conveyed 51 on the chain 12 stretched above the sprocket.

(Operation) The transported object is stocked on the chain stretched on the upper side between the first sprocket and the second sprocket. Now, it is assumed that the first sprocket side is the discharge side and the second sprocket side is the supply side. At the time of discharging, the first sprocket is rotationally driven by a predetermined angle by the first drive device. This increases the tension of the chain stretched on the upper side between the first sprocket and the second sprocket, so that the second sprocket is pulled toward the first sprocket against the urging force of the urging device. The second sprocket moves to the first sprocket side by the amount of movement of the chain. At the time of supply, the second drive device rotationally drives the second sprocket by a predetermined angle. As a result, the tension of the chain stretched on the upper side between the first sprocket and the second sprocket is reduced, so that the urging force of the urging device causes the second sprocket to move away from the first sprocket. It is urged to move away from the first sprocket by the amount of movement of the chain. In this way, the distance between the first sprocket and the second sprocket, that is, the stock area changes depending on the number of transported objects to be stocked, and the stock area is always filled with the transported objects.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 is a schematic configuration diagram of an accumulator according to an embodiment of the present invention, in which 1 is an accumulator, 2 is a supply belt conveyor for supplying an object to be conveyed such as a printed circuit board described later to the accumulator 1, and 3 is a conveyor belt. It is a discharge belt conveyor that conveys an object to be conveyed discharged from the accumulation conveyor 1 to a predetermined place. The supply belt conveyor 2 has a belt 4 and pulleys 5 to 8,
The pulley 8 is in contact with the outer peripheral surface of the belt 4. The discharge belt conveyor 3 has a belt 9 and pulleys 10 and 11. The accumulation conveyer 1 has an endless chain 12 for carrying an object to be conveyed. The chain 12 has a large number of plate-shaped blades for keeping the object to be erected in an upright posture. Although provided, details will be described later. A first sprocket 13 and a second sprocket 14 are meshed with the chain 12, and these first and second sprockets 13 and 14 are moved in the same direction by a first and a second drive device described later. Although they are driven to rotate by a constant angle, the driving timings are usually different from each other. The second sprocket 14 is rotatably attached to the moving frame 15, and the moving frame 15 has the first sprocket 13
It is configured to be able to approach and separate within a certain range. This moving frame 15 is urged by a constant urging force in a direction away from the first sprocket 13 by a cylinder device described later. Further, the pulleys 6 and 8 of the supply belt conveyor 2 are rotatably attached to the moving frame 15, and the pulley 8 is arranged on the same axis as the second sprocket 14. Reference numerals 16 and 17 denote sensors for detecting an object to be conveyed, and sensor 16 denotes the belt conveyor 2 for supply.
The sensor 17 is attached to the moving frame 15
Installed on.

FIG. 2 is a plan view of an accumulation conveyor according to an embodiment of the present invention, and FIG. 3 is a view taken in the direction of an arrow A in FIG. 2. The accumulation conveyor 1 has two chains 12, the supply belt conveyor 2 and discharge. Belt of the belt conveyor 3 for
9 has three articles. The first sprocket 13 of the accumulation conveyor 1 is fixed to the outer peripheral surface of a rotary shaft 19 whose both ends are rotatably supported by a conveyor frame 18, and the rotary shaft 19 has a bevel gear at one end. 20 is fixed, and a sprocket 21 is further fixed to the tip side thereof. The bevel gear 20 meshes with a bevel gear 23 fixed to an output shaft of an electric motor 22 as a first driving device attached to the conveyor frame 18, and the first sprocket 13 is driven by the electric motor 22. It A clutch and a brake are attached to the electric motor 22, and a proximity switch 24 is provided near the sprocket 21.
Is installed. The proximity switch 24 is for detecting the teeth of the sprocket 21 and knowing the rotation angle of the first sprocket 13. A cam clutch 25 is provided at the other end of the rotary shaft 19 as a countermeasure against power failure.

The second sprocket 14 is fixed to the outer peripheral surface of a rotary shaft 26 whose both ends are rotatably supported by the moving frame 15, and a bevel gear 27 is attached to one end of the rotary shaft 26. It is fixed and the sprocket 28 is attached to the tip side.
Is stuck. The bevel gear 27 is an electric motor that is attached to the moving frame 15 and serves as a second drive device.
The second sprocket 14 is meshed with a bevel gear 30 fixed to the output shaft of 29, and the second sprocket 14 is driven by the electric motor 29. A brake and a clutch are attached to the electric motor 29, and a proximity switch 31 is installed near the sprocket 28. The proximity switch 31 is for detecting the teeth of the sprocket 28 and knowing the rotation angle of the second sprocket 14. The rotating shaft 26
A non-excitation actuated electromagnetic brake 32 for power failure countermeasures is installed at the other end.

The pulleys 5 and 7 of the supply belt conveyor 2 are fixedly attached to the outer peripheral surfaces of the respective rotating shafts 33 and 34 which are rotatably supported at both ends by the conveyor frame 18, and the pulley 8 is provided. Is rotatably attached to the outer peripheral surface of the rotary shaft 26. A bevel gear 35 is fixed to one end of the rotating shaft 34. The bevel gear 35 meshes with a bevel gear 37 fixed to the output shaft of an electric motor 36 mounted on the conveyor frame 18, and the belt 4 Is driven by the electric motor 36. Both ends of one fixed shaft 38 are fixed to the moving frame 15,
One end of a plurality of levers 39 rotatably attached to the outer peripheral surface of the rotary shaft 26 is fixed to the fixed shaft 38. Both ends of a roller pin 40 are fixed to the other end of the lever 39, and the pulleys 6 are rotatably attached to the outer peripheral surface of the roller pin 40, respectively. The sensor 17 is composed of a proximity switch, and the lever
It is attached to the other end of 39.

The pulley 10 of the discharge belt conveyor 3 is rotatably attached to the outer peripheral surface of the roller pin 42 having both ends fixed to a plurality of frames 41, and the pulley 11 is attached to the conveyor frame 18 at both ends. The portion is fixed to the outer peripheral surface of a single rotating shaft 43 which is rotatably supported. The rotating shaft
A bevel gear 44 is fixed to one end of 43. The bevel gear 44 meshes with a bevel gear 46 fixed to the output shaft of an electric motor 45 attached to the conveyor frame 18, and the belt 9 is the electric motor. Driven by 45.

The moving frame 15 is connected to a cylinder device 48 attached to the conveyor frame 18, and guided by a slide shaft 47 fixed to the conveyor frame 18,
It is possible to move in the transport direction of the transported object.

A large number of blades 49, 50 are fixed to the outer peripheral surface of the chain 12. That is, as shown in FIG. 4, the blades 49 are attached to one of the two chains 12 and the blades 50 are attached to the other of the two chains 12 at equal pitches. Between the blades 49 and 50 adjacent to each other, a plate-shaped object 51 to be conveyed such as a printed circuit board is housed and conveyed in an upright posture.

FIG. 5 is a circuit diagram of the working fluid of the cylinder device 48.
Is a filter regulator, 53 is a regulator, 54 is a solenoid valve, 55 is a hydro unit, 56 and 57 are silencers, and 58 is an air source. When the solenoid valve 54 is excited, the air from the air source 58 is supplied to the pressure converter 59 of the hydro unit 55 via the filter regulator 52 and the regulator 53. The pressure converter 59 converts air pressure into hydraulic pressure, and the hydraulic pressure is transmitted via a valve mechanism 62 including a check valve 60 and a variable flow rate adjusting valve 61 and a solenoid valve 63. The reason why the air pressure is converted into the hydraulic pressure by the pressure converter 59 is that an inconvenience such as chattering occurs in the air cylinder. Further, as a countermeasure against a power failure, a spring return type during non-excitation is used as the solenoid valve 63 to shut off the hydraulic circuit. 64 is a blind plug.

Next, the operation will be described. When the object to be conveyed 51 is conveyed by the supply belt conveyor 2 and the sensor 17 detects the object to be conveyed 51, the electric motor 29 is activated and the second sprocket 14 moves the blades 49, 50 in the direction of the arrow in FIG. Rotate by 1 pitch. At this time, since the transferred object 51 is in the state shown in FIG. 4 (B), the transferred object 51 is moved by the rotation of the chain 12 into the blades 49, 5.
Can be scooped up to 0. The rotation of the second sprocket 13 reduces the tension of the portion of the chain 12 stretched between the first sprocket 13 and the second sprocket 14 so that the moving frame 15 moves to the cylinder device 48. It is pushed and moves to the left side in FIG. This moving distance is 49,5
One pitch is 0. In this way, the moving frame 15 moves leftward in FIG. 1 every time the transported object 51 is supplied.

On the other hand, at the time of discharging, the electric motor 22 operates to rotate the first sprocket 13 by one pitch of the blades 49, 50 in the direction of the arrow in FIG. As a result, the transported object 51 rides on the belt 9 of the discharging belt conveyor 3 and is transported. The rotation of the first sprocket 13 increases the tension of the portion of the chain 12 stretched between the first sprocket 13 and the second sprocket 14 so that the cylinder device 48 moves to the moving frame 15. When pushed, the moving frame 15 moves to the right in Fig. 1.
Move one pitch of 49,50. At this time, the hydraulic pressure of the cylinder device 48 is automatically and precisely kept constant by the pressure reducing valves of the filter regulator 52 and the regulator 53.

In this way, the supply and discharge of the transported object 51 are performed at completely different timings, and at that time, the tension of the chain 12 is always kept constant by the movement of the moving frame 15. That is, when the transported object 51 is supplied, the moving frame 15 moves to the left in FIG. 1 and the stock area L increases, and when the transported object 51 is discharged, the moving frame 15 moves to the right in FIG. The stock area L decreases.

By the way, in order to prevent the chain 12 from breaking when the moving frame 15 reaches the limit on the right side in FIG. 1, that is, when the stock area L becomes the minimum, the transported object 51 continues to be discharged. Always rotate the second sprocket 13 when turning
The sprocket 14 of is rotated. That is, when the sensor 16 detects the conveyed object 51, the sensor 17
Wait for 51 to detect first and second sprockets 1
Rotate 3,14 at the same time.

When the moving frame 15 reaches the limit on the left side in FIG. 1, that is, when the stock area L reaches the maximum, the supply of the object 51 to be conveyed continues. When rotating the sprocket 13, the second sprocket 14 must be rotated. Actually, before the movable frame 15 reaches the left limit of FIG. 1, a full alarm is issued, supply is prohibited, and only discharge is performed.

During a power failure, the cam clutch 25 prevents the reverse rotation of the first sprocket 13. This is to prevent the first sprocket 13 from reversing due to the weight of the transported object 51. The non-excitation actuated electromagnetic brake 32 prevents the rotation of the second sprocket 14. Further, the solenoid valve 63 of the hydro unit 55 is spring-returned to shut off the hydraulic circuit of the cylinder device 48, and the movement of the moving frame 15 is blocked.

As described above, according to the present invention, the change in the tension of the chain 12 between the first sprocket 13 and the second sprocket 14 is absorbed by the movement of the moving frame 15. , The object 51 to be conveyed can be supplied and discharged at completely different timings.
There is no empty seat of the transported object 51 during the period, the stock area L can always be used to the maximum extent, and stock can be carried out very efficiently. The fact that there is no empty seat for the transported object 51 in the stock area L means that the transported object 51 is always ejected if the first sprocket 13 is rotated by a predetermined angle during ejection. Can be performed quickly and work in the next process can be performed smoothly. Due to the positional relationship between the large-diameter pulley 8 and the small-diameter pulley 6, the transported object 51 can be sequentially supplied to the blades 49, 50 as shown in FIG. 4 (B). Further, since the chain 12 has a hanging length, the stock area L can be sufficiently secured.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an accumulation conveyor in one embodiment of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a view on arrow A in FIG. 2, and FIG. 4 (A) is a plan view of blades. 5B is a front view of the same, and FIG. 5 is a circuit diagram of a fluid circuit of the cylinder device. 12 …… Chain, 13 …… First sprocket, 14 …… Second sprocket, 22,29 …… Electric motor, 48 …… Cylinder device, 51 …… Conveyed object

Claims (1)

[Claims] Claims: 1. A plurality of endless chains (12) of downward length that have blades (49, 50) for carrying a plate-shaped object (51) and mesh with the chains (12). And a first sprocket (13) that is intermittently driven to rotate by a first drive device electric motor (22), and the chain (12).
To the rear side of the chain (12) and is intermittently rotatably driven in the same direction as the first sprocket (13) by the second drive motor (29) and with respect to the first sprocket (13). A second sprocket (14) supported on a movable frame (15) that can approach and separate within a certain range, and a second attachment that is fixed in a direction in which the second sprocket (14) moves away from the first sprocket (13). An urging cylinder device (48) for urging with a urging force, a large-diameter pulley (8) concentric with the second sprocket (14), rotatable, and slightly small in diameter, and immediately after that, a large-diameter pulley (8). Has a small diameter pulley (6) slightly higher than the bottom of the chain, and has blades (49, 50) of the chain (12)
A supply belt conveyer (2) for supplying the conveyed object (51) to and a discharge belt conveyor (3) for receiving the conveyed object (51) immediately below the first sprocket (13). The chain (1) stretched on the upper side between the first sprocket (13) and the second sprocket (14).
2) An accumulator characterized in that the number of stocks can be varied by stocking the objects (51) to be transported on top.