JPH043696Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a conveyance device for conveying array-type workpieces in a press or the like.

(Prior art) Conventionally, transfer of a workpiece from one mold to another within one press machine, or loading/unloading of a workpiece into/out of a press machine, has been carried out using a transfer device or having a transfer device. In the case of a press machine that does not have a press machine, a robot or the like or simply a cylinder device operated by air pressure or hydraulic pressure is used to convey the workpiece by pushing or pulling the workpiece.

Further, as shown in FIG. 11, the transfer device normally moves the transfer bar 51 in a reciprocating direction in the conveyance direction and raises it when the forward movement of the reciprocating movement is stopped.
Workpieces 52, 52, . . . are transported between molds 53, . . . by a box motion that is lowered when the rear is stopped. In a relatively inexpensive simple transfer device, the box motion of the transfer bar 51 is moved by the piston rod 54 in the conveying direction.
a cylinder device 55 that expands and contracts the piston rod 56; and a cylinder device 57 that expands and contracts the piston rod 56 in the vertical direction.
It is carried out with.

(Problem that the invention attempts to solve) However, when conveying using a cylinder device,
The piston rod of the cylinder device operates at almost the same speed during the stroke as shown by curve A in Figure 12, and there is a sudden speed change at the stroke start position S and end position S, so inertia force acts on the workpiece. There is a problem in that transport errors such as falling down occur. This has been dealt with by providing a shock absorber or lowering the conveyance speed, but this has problems such as a longer cycle time and lower productivity.

In addition, when box-motioning the transfer bar using a cylinder device in a transfer device, etc., it is necessary to accurately synchronize the operating timing of each cylinder device, and a special control circuit must be provided for this purpose. ,
Problems arise in that equipment costs are high and maintainability is poor.

The present invention was created in view of the above problems, and allows the transport device to perform box motion without using a complicated control circuit, and transports the workpiece without applying too much inertial force to the workpiece. The purpose is to

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention moves a slider attached with a fork for transporting a workpiece to a liftable guide rail that extends along the transport direction of the workpiece. The slider is connected to a swinging arm that swings along the conveying direction in accordance with the rotation of the crankshaft, and the guide rail is connected to a lifting mechanism that moves up and down in accordance with the rotation of the plate cam. , the crankshaft is connected to a first rotary shaft branched from one drive source, the plate cam is connected to a second rotary shaft branched from the drive source, and the swing arm swings. The cam profile of the plate cam is set so that the lifting mechanism is operated at the moving end.

(effect) The above configuration works as follows.

The slider reciprocates on the guide rail in response to the swinging of the swinging arm, and at the end of its movement, an elevating mechanism operates to raise or lower the guide rail, and a fork attached to the slider performs a box motion. Since the slider is moved by transmitting the rotation of the crankshaft to the swinging arm, the acceleration and deceleration at the beginning and end of the movement are gentle, and no large inertial force is generated on the workpiece. Also, 1
Since the power is distributed to the first and second rotating shafts from one drive source, there is no need to synchronize the reciprocating movement of the slider with the vertical movement of the guide rail.

(Example) Next, an example of the present invention will be described using FIGS. 1 to 10.

First guide rails 1, 1 and second guide rails 2, 2 are oriented longitudinally in the transport direction of the workpiece W.
are provided in pairs at predetermined intervals. A first slider 3 is movably engaged with the first guide rails 1, 1, and a second slider 4 is movably engaged with the second guide rails 2, 2.
The first slider 3 has a pair of first slide parts 3
a, 3a, and a first connecting member 3b that connects the respective first slide parts 3a, 3a, and the second slider 4 similarly consists of second slide parts 4a, 4a and a second connecting member 4b. It is made up of. A pair of forks 5, 5, 6, 6 are provided in the first and second connecting members 3b, 4b, respectively, extending in opposite directions along the workpiece conveyance direction. In addition, each fork 5, 5, 6, 6 has 5 fins for conveying the workpiece.
a,..., 6a,... are provided.

On the other hand, the drive mechanism 7, which is the drive source of the present invention, consists of a servo motor 8 and a reduction mechanism 9, and the rotation of the servo motor 8 is decelerated via the reduction mechanism 9 and transmitted to the two shafts 10 and 11. be. To describe this drive mechanism 7 in detail, as shown in FIG. The rotational speed is transmitted and decelerated, giving each of the shafts 10 and 11 a predetermined rotational speed.

Crank mechanisms 15 and 16, which are used as the reciprocating mechanism of the present invention, are connected to the shaft 10 via an index drive (not shown).
The crank mechanism 15 consists of a crankshaft 15a and a link 15b attached to the outer peripheral end of the crankshaft 15a, and the crank mechanism 16 similarly consists of a crankshaft 16a and a link 16b. And this crank mechanism 15, 16
The rotational movement of the shaft 10 is connected to the links 15b and 16.
This converts it into a forward and backward motion (linear motion) of b. Note that the links 15b and 16b are connected to the shaft 10.
As the shaft 10 rotates, the shaft 10 moves toward and away from the shaft 10 alternately.

Furthermore, swinging arms 17 and 18 are attached to the links 15b and 16b, respectively, and the swinging arms 17 and 18 repeat swinging at a constant period due to the forward and backward movement of the links 15b and 16b. Further, one end of a tie rod 19 is rotatably attached to the tip of the swinging arm 17, and the other end of the tie rod 19 is attached to the slide portion 3a of the slider 3 described above. Further, one end of a tie rod 20 is rotatably attached to the distal end of the swinging arm 18, and the other end of the tie rod 20 is also attached to the slide portion 4a of the slider 4. In this way, Figures 4 and 5
As shown in the figure, the rotation of the shaft 10 causes the swing arms 17 and 18 to swing by the crank mechanisms 15 and 16, and the slide portions 3a and 4a to reciprocate on the guide rails 1 and 2.

In the crank mechanisms 15 and 16, if the crankshafts 15a and 16a rotate at a constant speed, the forward and backward movement speeds of the links 15b and 16b change as shown by curve B in FIG. 12. This is because the speed changes gently near the turning point of forward and backward movement, and by utilizing this speed change, it is possible to transport the work without creating a large inertial force on the work.

The other shaft 11 of the drive mechanism 7 is connected to a cam mechanism 21 that operates an elevating mechanism to be described later. This cam mechanism 21 is connected to the shaft 11.
A cam surface (cam profile) is a combination of a plate cam 22 connected to the plate cam, and a large diameter portion 22a and a small diameter portion 22b formed on the plate cam with a phase difference of 180 degrees.
A swinging arm 24 is engaged with the swinging arm 24 via a rotating member 23, and the rotational movement of the shaft 11 is exchanged with the rotational movement of the swinging arm 24 at a constant period. Note that 25 is a backup cylinder. One end of a tie rod 26 is rotatably attached to the tip of the swinging arm 24.
The other end of 6 is attached to a lever 28 that is rotatably provided around a rotating shaft 27. Lever 28
One end of each of a pair of rods 29 and 30 is rotatably attached to the guide rail 1, and the other end of one rod 29 is attached to the lower surface of the first guide rail 1, and the other end of the other rod 30 is attached to the lower surface of the first guide rail 1. The end is attached to the lower surface of the second guide rail 2.

As shown in FIGS. 6 and 7, the rotation of the shaft 11 is controlled by the swing arm 2 via the plate cam 22.
4 and further move the tie rod 26 back and forth (linear movement), the lever 28 rotates about the rotation shaft 27 and moves the first and second guide rails alternately in the vertical direction.

Next, the operation related to the above configuration will be explained.

Although this example has various uses,
For example, a case will be described in which the present invention is used as a transfer device used for sequentially conveying workpieces within one press machine.

As shown in FIG. 4, FIG. 5, and FIG. 8, the upper die 32 is lowered into the lower die 31 and the workpiece is pressed simultaneously in the first processing step A and the second processing step B. They are sequentially arranged and conveyed from the first processing step A to the second processing step B.

When the press work is finished and the upper die 32 is raised, the servo motor 8 is operated from the original position shown in FIG. 4 to drive the shaft 10 via the index drive. Then, the crank mechanisms 15 and 16 swing the swinging arms 17 and 18 to the position shown in FIG. 5. At that time, fingers 6a, 6 of fork 6
a transports the workpiece W into the second processing step B.
Note that the workpiece W in the second processing step B is carried out of the mold by a kicker 33 provided at the tip of the fork 6 (operation shown in FIG. 8). Further, the fork 5 is moved above the first processing step A. Therefore, the mounting position of the plate cam 22 is adjusted so that the rotating member 23 of the swing arm 24 moves to the large diameter portion 22a of the plate cam 22 at the swing ends of the swing arms 17 and 18, that is, at the moving ends of the sliders 3 and 4. Adjust in advance. As a result, when the swinging arms 17 and 18 reach their swinging ends, the swinging arm 24 swings as shown in FIG. 7, the lever 28 rotates, the first guide rail 1 descends, and the second The guide rail 2 of is raised (operation shown in FIG. 8).

During this time, the shaft 10 continues to rotate, and at the timing when the above operation is completed, the swing arms 17 and 18 swing in opposite directions, and the sliders 3 and 4 move accordingly. Return to original position. Also, at this time, Finger 5 of Fork 5
a and 5a carry out the workpiece W that has been processed in the first processing step B (operation shown in FIG. 8).

At this point, the unprocessed workpiece W is put into the first processing step, and the upper die 32 is lowered to process the workpiece W. At the same time, the cam mechanism 21 is operated to raise the first guide rail 1 and lower the second guide rail 2 (operation shown in FIG. 8).

Then, the upper die 32 is raised and one cycle is completed.

In this embodiment, the forks 5 and 6 that transport the workpiece are provided on the left and right sides of the center of the device, so the center of gravity during transport is less likely to shift and the load on the drive unit is less variable than in conventional transfer devices. This greatly reduces the amount of friction, ensuring smooth movement even during high-speed operation. In addition, since the device itself is configured completely independent of the mold, it can be used for another similar mold by simply changing the workpiece holder, thereby reducing costs.

Note that 34 is a workpiece receiving rail, which is passed between processing steps.

In the above embodiment, the fork 5 and the fork 6 are moved in opposite directions to convey the workpieces W in an array. However, as another example of the movement of the fork 5 and the fork 6, the one shown in FIG. There is. This allows the first guide rail 1 and the second guide rail 2 to be raised or lowered simultaneously,
Furthermore, the slide parts 3a, 4a of the sliders 3, 4
The fork 5 and the fork 6 are simultaneously moved in the same direction to convey the workpiece.

In addition, as another embodiment according to the present invention, the first
As shown in Fig. 0, fingers 35, 35 are provided above forks 36, 36 to lift and convey the workpiece.Furthermore, the one in Fig. 10 has a conveyor etc. arranged in the center, and this is possible. It can also be used as a device to transfer workpieces sent from side to side.

(Effects of the invention) In this invention, the movement of the slider that conveys the workpiece is carried out by transmitting the rotation of the crankshaft to the swinging arm, so the acceleration and deceleration at the beginning and end of the movement are gradual, resulting in a large inertia on the workpiece. This will no longer occur and the workpiece will be transported stably. Moreover, since the speed during conveyance is sufficiently high, productivity is not hindered. Further, since it is only necessary to control the activation and stopping of the drive source and no complicated control circuit is required, it is possible to reduce costs and facilitate maintenance.

[Brief explanation of the drawing]

FIG. 1 is an enlarged perspective view showing the main parts of the embodiment of the present invention, FIG. 2 is a detailed perspective view of the drive mechanism shown in FIG. 1, and FIG. 3 is an overall perspective view of the embodiment of FIG. 1. figure,
FIG. 4 is a front view of the crank mechanism showing the original position of each fork in FIG. 1, FIG. 5 is a front view of the crank mechanism showing the state when the forks have moved from FIG. 4, and FIG. 1 is a front view of the cam mechanism showing the movement positions of the first and second guide rails when the small diameter part of the planar cam of the cam mechanism is engaged with the swing arm, and FIG. FIG. 8 is a front view of the cam mechanism showing the movement position of each guide rail when the large diameter portion of the fork engages with the swinging arm. FIG. 8 is a schematic diagram showing the box motion of the fork of the embodiment of FIG. 8 is a schematic diagram showing another box motion of FIG. 8, FIG. 10 is a schematic diagram showing another embodiment, and FIG. The front view and FIG. 12 to be described are diagrams showing the relationship between the stroke and speed of the cylinder device and the crank mechanism. 1, 2... Guide rail, 3, 4... Slider, 5, 6... Fork, 8... Servo motor,
15, 16... Crank mechanism, 15b, 16b...
...Link, 22...Plate cam, 24...Swinging arm.

Claims (1)

[Scope of utility model registration request] A slider equipped with a fork for conveying the workpiece is provided on a guide rail that extends along the conveyance direction of the workpiece and is movable up and down, and is movable along the conveyance direction. The crankshaft is connected to a swinging arm that swings along a direction, the guide rail is connected to a lifting mechanism that moves up and down in accordance with the rotation of a plate cam, and the crankshaft is connected to a first drive source branched from one drive source. The cam of the plate cam is connected to a rotating shaft, the plate cam is connected to a second rotating shaft branched from the drive source, and the cam of the plate cam is configured to operate the lifting mechanism at the swinging end of the swinging arm. A conveyance device characterized by having a profile set.