JPH0558434A - Carrier device for duplex continuous machining - Google Patents

Abstract

PURPOSE:To provide a carrier device which inverts a plurality of workpieces while feeding them to a machining apparatus which continuously machines both upper and lower sides of workpieces and which allows workpieces whose one side has been machined to be inverted 180 deg. while they are being carried at a given speed to keep the interval of a plurality of adjacent workpieces unchanged before and after the inversion. CONSTITUTION:Among three aligned conveyors, a first conveyor 2 and a third conveyor 4 constantly carry a plurality of workpieces P at a specified speed in one direction A. After the second conveyor 3 receives a workpiece P from the first conveyor 2, a driving motor stops at a specified stop time and an inversion mechanism causes the second conveyor 3 to invert 180 deg. while holding the workpiece P. Later, the driving motor 19 is actuated at a specified operation restart time to cause the workpiece to be carried at the same speed in the same direction A as in the operation before the inversion. The stop time and operation restart time of the driving motor 19 are provided by sensors 30 and 31 diposed on the first conveyor 2 and the third conveyor 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate-shaped workpiece conveying device. More specifically, the present invention relates to a transfer device that can reverse the upper and lower surfaces of a plate-like work during transfer and can be used in a double-sided continuous processing step.

[0002]

2. Description of the Related Art Combining various conveying devices for cutting, drilling, pressing, surface treatment, etc. with a conveying device for continuously carrying in and / or unloading a large number of workpieces to be machined makes It is indispensable for automation and speed-up, and various systems have been studied and used conventionally. Where 1
When performing continuous machining on one workpiece with multiple machining devices, if the posture of the workpiece needs to be changed between one machining device and the next machining device, the operator manually This is carried out, or if desired, a work displacement device such as a reversing device is used.

In such a situation, for example, in a paint coating device, when the paint is continuously applied to both front and back surfaces of a large number of plate-shaped works, the work whose one side is finished by one application device is manually or Invert 180 degrees with a known reversing device,
It was sent to the second coating device and the remaining surface was coated. Further, in the case of this type of coating device, particularly in the case of a spray type coating device in which paint is sprayed from above the work and sprayed onto the surface of the work, a transport device that operates at a constant speed in order to keep the coating thickness constant. The method of constantly spraying a fixed amount of paint on the above work has been common.

[0004]

In the above-mentioned spray type coating apparatus, since the coating material is constantly sprayed on the surface of the moving work, the distance between adjacent works of a plurality of works on the carrying device is narrowed as much as possible. This contributes to prevention of waste of paint. Therefore, when the work is first supplied to the transfer device, the space between the works is supplied as narrow as possible, but when two surfaces of the work are continuously coated by the two coating devices as described above, the intermediate position Since the forward movement of the work is interrupted during the work reversing work in, the intervals between the works are generally wider than those before the reversing or there are variations. This is the same both when it is done manually and when a well-known reversing device is used. Therefore, there is a problem that the use efficiency of the paint in the second coating device is deteriorated.

Further, it is not limited to the spray type coating device,
It can be said that keeping the interval between the works being conveyed constant before and after the reversal is one condition for maintaining the same work efficiency of the two processing devices. In view of the above, the present invention has an object to provide a double-sided continuous processing transfer device that can continuously transfer a work by including a reversing device that can maintain a constant interval between each work before and after reversing. To do.

[0006]

In order to achieve the above object, a carrying device for continuous double-sided processing according to the present invention is arranged in a line for carrying a plurality of works continuous at a predetermined interval in one direction at a constant speed. The first and third conveyors are provided with driving means that are always operated so as to continuously feed each work at a constant speed, and the second conveyor is the first conveyor. Reversing means for reversing the second conveyor while supporting one work received from the conveyor, and the reversing work which is stopped immediately before the start of reversing and is operated again immediately after the reversing is performed in the same direction as before the reversing. And driving means controllable to feed the second conveyor, and means for defining the stop time and the operation restart time of the second conveyor, which are equal to the mutual interval between adjacent works on the first conveyor. At intervals 2 of the conveyor is obtained to be able to pass the inverted workpiece to a third conveyor.

The means for defining the stop time and the operation restart time of the second conveyor detects that the work next to the work supported by the second conveyor has reached the front end position of the first conveyor. The first sensor and the second sensor that detects that the work before the work supported by the second conveyor has completely passed the rear end position of the third conveyor may be used.

[0008]

The first, second, and third conveyors normally convey the work in one direction at a constant speed. The drive means of the second conveyor is stopped when a predetermined stop time comes after receiving the work from the first conveyor, and the work is supported by the reversing means to be inverted by 180 °. After that, when a predetermined operation restart timing comes, the driving means is started and the work is conveyed in the same direction as before the reversal at the same speed and is transferred to the third conveyor. At this time, each period is appropriately set in advance by means for defining the stop time and the operation restart time of the second conveyor. As a result, the second conveyor operates so as to pass the reversed works to the third conveyor at an interval equal to the mutual interval between adjacent works on the first conveyor.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a spray type double-sided continuous coating apparatus will be described below with reference to the accompanying drawings. 1 and 2 schematically show a conveying device 1 for continuous double-sided processing according to an embodiment of the present invention. The transfer device 1 receives a work P from a first conveyor 2 that continuously transfers a plate-like work P in one direction (direction of arrow A in FIG. 1) at a constant speed v and receives the work P from the first conveyor 2. The second conveyor 3 which reverses and transfers the work P to the next third conveyor 3
And a third conveyor 4 that receives the work P from the second conveyor 3 and conveys the work P in the direction of arrow A at the same speed v as the first conveyor 2.

First conveyor 3 and third conveyor 4
Consists of a well-known sandwiched belt conveyor having the same structure as each other, and the same reference numerals are given to the same constituent members to avoid duplication of description, and only one of them will be described. As shown in FIG. 1, the first conveyor 2 includes a pair of endless belts 5 (hereinafter, referred to as belts 5) each forming a loop. The belts 5 are arranged substantially parallel to each other and are supported by pulleys 6 connected to a drive motor (not shown) at both ends. A plurality of protrusions 8 are provided at predetermined intervals on the surfaces of the belts 5 facing each other, that is, the outer surface 7 of the loop. As can be seen from FIG. 3, the protrusion 8 projects from the outer side surface 7 of the belt 5 into a substantially rectangular parallelepiped shape,
The upper end surface 9 is arranged below the upper end surface 10 of the belt 5. When the plate-like work P is conveyed, each belt 5
The upper end surface 9 of the projection 8 supports the lower surface of the work P close to both side edges, and the outer surface 7 above the projection 8 holds the work P from both side edges. In this state, the drive motor is driven to convey the work P in the direction of arrow A at a constant speed v.

First conveyor 3 and third conveyor 4
Are arranged below the first coating material spray nozzle N1 and the second coating material suction nozzle N2 of the double-sided continuous coating device (see FIG. 2). At the time of applying the coating material, a fixed amount of the coating material is constantly sprayed from each of the coating material spray nozzles N1 and N2, and the work P placed on each of the conveyors 2 and 4 moves at a constant speed v below them. By this, the work P
A coating film having a uniform thickness can be obtained on both surfaces of.

The carrying device 1 shown in FIGS. 1 and 2 has an intermediate position between the first conveyor 2 and the third conveyor 4,
A second conveyor 3 for reversing the work P is provided. The second conveyor 3 has two endless belts 11 (hereinafter, referred to as belts 11) having a relatively short length, and a gap between the two endless belts 11 so that the plate-like work P can be held from the upper and lower surfaces. The pair of belts 11 are vertically opposed to each other, and the pair of belts 11 are arranged substantially parallel to each other at two positions close to both side edges of the work P, and a total of four belts 11 are provided. It is sufficient that the total length of the second conveyor 3 is approximately the same as the total length of the work P.

As shown schematically in FIGS. 2 and 4, the second
Each belt 11 of the conveyor 3 is supported by a driving pulley 12 and a driven pulley 13, respectively. Each drive pulley 12 is laterally connected to each other by a pair of upper and lower shafts 14 (14a, 14b), and each driven pulley 13 is also laterally connected by a pair of upper and lower shafts 15. To be done. Both ends of each shaft 14, 15 pass through a pair of frames 16, 16 'respectively arranged further outside each belt 11,
The bearings 17 and 18 are rotatably supported. One shaft 14a (lower side in FIGS. 2 and 4) of each drive pulley 12 has one end connected to the drive motor 19 and the other end provided with a spur gear 20a. Further, the other shaft 14b of the drive pulley 12 is provided with a spur gear 20b at one end so as to mesh with the spur gear 20a of the shaft 14a. This allows the drive motor
When 19 operates, each drive pulley 12 rotates via the shaft 14a, the spur gear 20a, the spur gear 20b, and the shaft 14b. At this time, the upper and lower drive pulleys 12 rotate in opposite directions, so that the work P is sandwiched between the upper and lower belts 11 and conveyed in a predetermined direction (arrow A direction in FIG. 1). Is possible. The drive motor 19 is a known reversible motor whose rotation direction can be reversed, and the conveyance speed of the work P by its drive is the same speed v as that of the first conveyor 2 and the third conveyor 4.

The second conveyor 3 for reversing the work is further provided with respect to the rotary shaft 21, each frame 16, 16 'and a belt.
An inverting mechanism 22 for inverting 11 by 180 ° is provided. Inversion mechanism 22
Is a cylinder member 23 that operates by a signal from a sensor described later, and a piston rod 24 of the cylinder member 23 at one end.
In addition, a swing rod 26 having the other end connected to the spur gear 25, and another spur gear 27 that meshes with the spur gear 25 that is rotated by the swing of the swing rod 26 are provided. The spur gears 25 and 27 are rotatably supported by a pedestal 28, and the axis of the spur gear 27 is a pedestal.
It penetrates through 28 and is connected to substantially the center of one frame 16 to form the rotary shaft 21 of the second conveyor 3. The frame 16 'on the opposite side of the second conveyor 3 likewise has an axis of rotation about its center.
21 ', and another pedestal 29 rotatably supports the rotary shaft 21'. The ratio of the number of teeth of the spur gear 27 having the rotating shaft 21 and the spur gear 25 connected to the swing rod 26 is approximately 1: 2.
And, as shown in FIG.
Is swung in the range of approximately 90 °, the spur gear
27, and therefore each belt 11 will rotate in the range of 180 °.

The transfer device 1 shown in FIG. 1 further includes a sensor at the front end position of the first conveyor 2 in the work transfer direction.
A sensor 31 is installed at the rear end position of the sensor 30 in the work transfer direction of the third conveyor 4. The sensors 30 and 31 are, for example, known photoelectric switches, and detect that the leading end and the trailing end of the work P have reached the respective arrangement positions,
Signals are output to the drive motor 19 and the cylinder member 23 of the second conveyor 3 to control the respective operations.

A very characteristic operation of the present invention having the above-mentioned structure will be described below with reference to FIG. The conveyors 2, 3 and 4 of the transfer device 1 always transfer the work P in the direction of arrow A at a constant speed v (FIG. 5A). At this time, the mutual interval between the plurality of works P supplied to the first conveyor 2 maintains a constant value c. In addition, the first conveyor 2 and the second conveyor 3, and the second conveyor 3 and the third conveyor 4
Are arranged at equal intervals D. Above the first conveyor 2 and the third conveyor 4, the respective nozzles N1 and N2 continuously blow out the paint in a spray state.

During transfer of a plurality of works P, a work P
When the front edge of No. 1 reaches the front end position of the first conveyor 2 (Fig. 5 (b)), the sensor 30 detects this and outputs a signal to the drive motor 19 of the second conveyor to stop the operation. At the same time, a signal is output to the cylinder member 23 to activate it. Each belt 11 of the second conveyor 3 has a work P1.
While the work P2 immediately before is held in the state of FIG. 5 (b), the cylinder member 23 is actuated (forward in the figure) to rotate the rotary shaft 21 through the swing rod 26, the spur gears 25 and 27. Is rotated and stopped at a position rotated by 180 ° (Fig. 5 (c)). As a result, the work P2 is turned 180 degrees. During this time, each work P on the first conveyor 2 and the third conveyor 4 continues to move at a constant speed v. Next, work P2
When the trailing edge of the work P3, which is one before the work P3, reaches the trailing end position of the third conveyor 4 (FIG. 5 (d)), the sensor 31 detects this and signals the drive motor 19 of the second conveyor. To drive the drive motor 19 in the opposite direction. As a result, the work P2 starts moving again at the speed v in the direction of arrow A, but at this time, the distance D between the conveyors 2, 3, 4 is increased.
Therefore, the distance between the work P2 and the work P3 is still held at the constant value C.

In order to effectively carry out the above-mentioned reversing operation, the time t required for reversing the second conveyor 3 is the time when the work P3 on the third conveyor 4 moves from the position shown in FIG.
It must be shorter than the time to reach the position of (d) and long enough so that the front edge of the work P2 and the rear edge of the work P3 do not interfere with each other at the end of the reversal. First conveyor 2
And each work (including the work P1 and the work P3) on the third conveyor 4 from the position of FIG. 5 (b) (operation stop of the second conveyor 3) to the position of FIG. 5 (d) (second conveyor). The following equation shows the condition of the time t required for the above-mentioned inversion, where l is the distance to move to (3) Resumption of operation).

[Equation 1] Here, v is the conveyance speed of the works P on the first conveyor 2 and the third conveyor 4, and c is the mutual interval of the works P on each conveyor. Also, naturally c <l
<D.

In this way, after the inverted work P2 is sent from the second conveyor 3 to the third conveyor 4 at a constant speed v and a constant interval c, the second conveyor 3 is again moved from the first conveyor 2 to the third conveyor 4. The received work P1 is clamped, and this time the cylinder member 23 is returned to rotate in the reverse direction to reverse the work P1.

By repeating such an operation, it becomes possible to always keep the mutual interval between the works P on the first conveyor 2 and the third conveyor 4 constant, and to prevent waste of the paint. ..

[0021]

According to the present invention, among the three conveyors arranged in line, the first and third conveyors are continuously driven at a constant speed, and the second conveyor receives from the first conveyor.
Two works are supported while being reversed, and they are stopped immediately before reversing and are operated immediately after reversing to drive the works in the same direction and at the same speed as before reversing. Since the work can be passed from the second conveyor to the third conveyor at an interval equal to the mutual interval between adjacent works on the first conveyor, the work can be moved at a constant speed. It is possible to invert by 180 ° while continuously transporting with, and it is possible to maintain a constant mutual interval between adjacent works before and after inversion. As a result, continuous processing steps on both sides of the work can be performed with the same efficiency, and when used in a spray-type double-sided continuous coating apparatus, it is possible to prevent waste of paint.

[Brief description of drawings]

FIG. 1 is a plan view of a carrying device for continuous double-sided processing according to an embodiment of the present invention.

FIG. 2 is a side view of the transfer device shown in FIG.

3 is a cross-sectional view of the first conveyor as seen from the line lll-lll in FIG.

4 is a cross-sectional view of the second conveyor as seen from the line IV-IV in FIG.

5 is an operation explanatory view of the transport device of FIG. 1. FIG.

[Explanation of symbols]

 2 ... 1st conveyor 3 ... 2nd conveyor 4 ... 3rd conveyor 5,11 ... Endless belt 6 ... Pulley 8 ... Protrusion 12 ... Drive pulley 14a, 14b, 15 ... Shaft 16, 16 '... Frame 19 ... Drive Motors 20a, 20b ... Spur gears 21, 21 '... Rotating shaft 23 ... Cylinder member 25, 27 ... Spur gear 26 ... Oscillating rod 30, 31 ... Sensor P ... Work

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical display location B65G 47/90 D 8010-3F 47/95 Z 8010-3F // B65G 43/08 B 9245-3F

Claims (2)

[Claims] 1. A carrying device for double-sided continuous processing, comprising first, second, and third conveyors arranged in order to carry a plurality of works continuous at a predetermined interval in one direction at a constant speed. , The first and third conveyors are provided with drive means that are always operated so as to continuously feed each work at a constant speed, and the second conveyor conveys one work received from the first conveyor. It is possible to control the reversing means for reversing the second conveyor while supporting it, and to stop the work immediately before the start of the reversal and operate again immediately after the end of the reversal to feed the reversed work in the same direction as before the reversal at the same speed. And a means for defining a stop timing and an operation restart timing of the second conveyor, and further comprising: 2 conveyors A double-sided continuous processing transfer device capable of transferring the reversed work to the third conveyor. 2. The means for defining the stop time and the operation restart time of the second conveyor is such that the work next to the work supported by the second conveyor has reached the front end position of the first conveyor. And a second sensor for detecting that the work before the work supported by the second conveyor has completely passed the rear end position of the third conveyor. Item 2. A conveying device for continuous double-sided processing according to item 1.