JPS6228384Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a workbench that is installed in the middle of a conveyor line for sequentially moving workpieces to the next process in order to carry out a series of work processes. The present invention also relates to a workbench whose positioning can be freely controlled.

On a line where processing or assembly work is performed through a series of assembly operations, workers transfer the workpiece carried by a conveyor to a work table separate from the conveyor, and after completing the required processing or assembly work. In many cases, the process of returning the product to the original conveyor is repeated. However, according to such a work method, when the object to be worked on is large and heavy, a large amount of time and effort is required for the transfer, leading to a decrease in work efficiency and fatigue of the worker. be.

To solve the above problems, for example,
Japanese Utility Model Publication No. 50-21186 or Japanese Utility Model Application Publication No. 50-45873 proposes a rotating table or workbench in which a rotating ball can enter and exit through a hole in the upper plate. If such a rotary table or workbench is installed in the middle of the conveyor, when the ball is projected from the hole in the upper plate, the conveyed object such as the workpiece supported by the ball can be moved with low resistance. When the rotating ball is lowered from the upper plate, the conveyed object can be placed on the upper plate. In this way, the rotary table or workbench disclosed in each of the above-mentioned publications can switch between a mode in which the conveyed object can be moved with low resistance on the upper plate and a mode in which the conveyed object can be fixed on the upper plate. By doing this, the above-mentioned problem is solved to a certain extent.

However, in the conventional examples disclosed in the above-mentioned publications, the mechanism for making the rotary ball vertically movable and vertically driveable below the rotary table or workbench is large, resulting in an overall vertically large device. Therefore, for example, if the roller conveyor is placed between the roller conveyors on a conveyor table, the range of use is limited, and if it is installed in the middle of the conveyor line, the entire conveyor line cannot be used. There was a problem that required a design change.

Furthermore, in Japanese Patent Publication No. 42-15880, a large number of ball receivers containing balls that are raised by compressed air sent through a common air pipe are arranged on the surface of the workbench, and when air pressure is applied to the balls, A flat plate on which to place the workpiece was placed on the workbench, which protruded slightly from the surface of the workbench and stopped when there was no pressure, and sank down and retracted slightly into the surface of the workbench when no pressure was applied. The configuration is disclosed.

However, in this structure, the ball itself is loaded in a ball receiver with an internal space larger than the upper opening so that it can move up and down slightly, and a compressed air introduction path is provided at the bottom of this internal space, so it is difficult to support the load of the ball. If the gap between the inner surface of the ball receiver and the ball is set too tightly in order to increase the force, the smoothness of the ball's rotation during upward movement will be impaired, and conversely, if the gap is made loose while ensuring the smoothness of the ball's rotation, air leakage will occur. There is a problem that this occurs and the load bearing capacity decreases. In any case, it is difficult to support a heavy object such as a mold in a movable manner with low resistance, and it is not practical.

This idea was devised under the above circumstances, and its purpose was to create a mode that could be extremely thin in the vertical direction, and also allow heavy objects to be transported with low resistance without any problems, and a An object of the present invention is to provide a new workbench on which a user can easily select a mode in which an object can be placed on its upper surface.

In order to solve the above problem, this invention takes the following technical measures.

That is, the workbench of this invention has a plurality of non-directional rotating wheels arranged below a flat plate-like top plate 6 in which a plurality of through holes 11 are bored, corresponding to the arrangement of the through holes 11. By disposing a base plate 10 to which 12... are fixed and driving the base plate 10 up and down by cylinders 9 driven by fluid pressure, each of the non-directional rotations is caused from each of the through holes 11... In the workbench where a state in which the main rotating balls 13 of the wheels 12 are protruded and a state in which the main rotating balls 13 are sunk from the through holes 11 can be selected, the top plate is further below the base plate 10. A flat bottom plate 8 is provided integrally with the bottom plate 6, and a guide hole 1 is provided in the bottom plate 6, into which a piston rod 14 can enter and retract.
A hollow cylinder block 16 with an open bottom 5 is fixed in a face-down manner to form a cylinder chamber 18 substantially by the bottom plate 8 and the hollow cylinder block 16.
A cylinder piston 19 having a piston rod 14 fitted into the guide hole 15 is fitted so as to be movable up and down, while the lower surface of the base plate 10 is substantially brought into contact with the upper surface of the piston rod 14, and the cylinder piston 19 is A pressure fluid conduit 20 is connected to the chamber 18 so that the cylinder piston 19 can move up and down when pressurized, and an ammunition A is connected between each of the non-directional rotating wheels 12 and the base plate 10. It is characterized in that each of the rotating parts of each non-directional rotating wheel 12 can be elastically lowered with respect to the base plate 10 by being interposed therebetween.

Hereinafter, the most preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing the overall appearance of a work table according to the present invention, with a part cut away, showing the internal structure of the work table when the work table is disposed midway along a so-called roller conveyor.

The workbench 1 has front and rear roller conveyors 2 and 3.
It has a rectangular parallelepiped shape with approximately the same width and height, and a pipe line 5 extends from a pipe port 4 provided on the side. This pipe line 5 is connected to a fluid pressure control device (not shown) consisting of a fluid pressure generation pump (not shown), a fluid pressure control valve switch (not shown), etc. , selectively sends pressure fluid into the workbench 1 from the piping port 4.

The workbench 1 also has a housing shape consisting of a top plate 6, a side plate 7, and a bottom plate 8, and cylinders 9, 9... and a base plate 10 that is driven up and down by the cylinders 9, 9... are incorporated inside the case. It is.

A plurality of through holes 11, 11, . . . are bored in the top plate 6, and each of the through holes 11,
11... are fixed to upward non-directional rotating wheels 12, 12, respectively, and when the base plate 10 moves up and down, each rotating main sphere 13, of the non-directional rotating wheels 12, 12... Top portions 13a, 13a... of 13...
can appear and disappear a certain distance from the through holes 11, 11, . . . in the top plate 6. Also, each non-directional rotating wheel 1
2, 12... and the base plate 10, and each non-directional rotary wheel 12, 12...
However, it is designed to be able to sink elastically.

The base plate 10 is reciprocated in the vertical direction by cylinders 9, 9, etc., which are driven by fluid pressure such as oil pressure or air pressure. A hollow cylinder block 16 having an open bottom and having a guide hole 15 through which the piston rod 14 can go in and out is fixed face down on the bottom plate 8, and the bottom plate 8 and the cylindrical hollow part of the cylinder block 16 are substantially connected to each other. A cylinder chamber 18 is formed in the cylinder chamber 18, and a cylinder piston 19 is fitted into the hollow part 17 so as to be movable a certain distance. By doing this, compared to a general cylinder, the length in the vertical direction is shortened by the amount corresponding to the bottom wall, and in order to expand the pressure receiving area of the cylinder piston, the cylinder block is designed as shown in the figure. Even if the cylinder has a circular outer diameter shape, it is convenient to fix the cylinder to the bottom plate 8 without any problems while maintaining the strength of the cylinder. This greatly contributes to significantly reducing the thickness of the workbench 1 itself.

As described above, since the cylinders 9, 9, . . . themselves are constructed in a thin shape, the appearance of the cylinder 9 is approximately disc-shaped as shown in FIG.

In the drawing, reference numeral 20 denotes a pipe connecting the piping port 4 attached to the side of the workbench 1 to the pressure ports 21, 21 of the cylinders 9, 9. This pipe may be a flexible pressure hose or a rigid pipe.

The pressure port 21 of the cylinder 9 opens at the side of the cylinder block 16, which has a substantially disk shape. A flow path 22 from this pressure port 21 to the cylinder chamber 18 is formed by utilizing the thick side wall portion of the block 16 and by opening the flow path 22 at the bottom side wall of the cylinder chamber 18. be. On the other hand, the bottom of the disk-shaped piston part 19a of the cylinder piston 19 is formed so that the inner part bulges out slightly more downwardly than the outer part, so that the cylinder piston 19 is at the lowest position. Even if the cylinder chamber 18 is lowered to a lower position, a substantially donut-shaped pressure space is formed at the bottom of the cylinder chamber 18. This approximately donut-shaped pressure space is always adjacent to the cylinder chamber side opening of the flow path 22. In this way, the bottom of the cylinder chamber 15 can be constructed by using the bottom plate 8 of the workbench 1, by opening the pressure port 21 of the cylinder 9 into the side wall of the cylinder block 16, and by opening the bottom of the cylinder chamber 15 from the pressure port 21 to the cylinder chamber 18. The passage 22 is formed by using the thick side part of the cylinder block 16, the cylinder chamber side end of the passage 22 is opened in the bottom side wall of the cylinder chamber 18, and the piston 16 is in the lowest position. By forming a substantially doughnut-shaped pressure space at the bottom of the cylinder chamber 18 when the cylinder descends, it is possible to form the entire cylinder 11 into a thin disk shape. It is.

In the figure, reference numeral 23 denotes a return spring interposed between the upper bottom part of the cylinder chamber 18 and the piston 19. When the fluid pressure is lowered, the return spring 23 quickly lowers the piston 19 to the base plate 10 and This is for quickly discharging the gas from the cylinder chamber 18. If the fluid pressure control device is equipped with a fluid discharge mechanism, this return spring 23 is not particularly necessary. When using a simple fluid pressure control device, this return spring 23 may be used.

The upper end of the piston rod 14 is a flat surface, and when the piston 19 descends to the lowest position, this flat surface is continuous with the upper end surface of the cylinder block 16 to form a flat surface. This is advantageous because the base plate 10 to be placed on it becomes stable.

In the example shown in the drawing, a total of four cylinders 9 are attached to the four corners of the bottom plate 8 of the workbench 1, but the number of cylinders 9 depends on the weight of the workpiece placed on the workbench 1, It is also possible to increase or decrease the number as appropriate depending on the capacity of the fluid pressure control device or the purpose of use of the workbench. Further, by increasing the pressure receiving area of the cylinder piston, it is possible to arrange only one cylinder 9 in the center of the bottom plate 8, for example.

The base plate 10 has a four-sided shape substantially similar to the inner bottom surface of the workbench 1, and moves up and down while resting on the upper surfaces of the piston rods 14 of the four cylinders 9. The base plate 10 is provided with appropriate ribs 24 for imparting bending rigidity and a guide plate 25a for slidingly contacting the inner wall of the side wall 7 of the base plate 1 to accurately guide the base plate 10 in the vertical direction. It's a good idea to leave it there.

In addition, the base plate 10 and the cylinder piston 1
There is no particular need for the members 9 to be fixed to each other.

Non-directional rotating wheels 12, 1 provided on the base plate 10
There are various examples of 2..., but in short, any structure may be used as long as the rotating main sphere 13 is configured to be able to rotate in no direction and with almost no resistance. In this embodiment, as shown in FIG. 4, a bowl-shaped seat body 26 is provided inside a cylindrical casing 25, and a plurality of small ball groups 27, 27, . . . are arranged on this bowl-shaped seat body 26. The rotating main ball 13 is placed through the main rotating ball 13, and the top portion 13a of the rotating main ball 13 projects upward from the upper window 27a of the casing 25. Thus, when the rotating main ball 13 is forcibly rotated, the small ball groups 27, 27 interposed between the rotating main ball 13 and the gun-shaped seat 26
... circulates while rotating, so the rotating main sphere 13
It rotates with almost no resistance in the direction in which it is rotated.

A bullet A is interposed between each of the non-directional rotating wheels 13 and the base plate 10, and the non-directional rotating wheels 13
is made to be able to elastically sink with respect to the base plate 10, and this can be achieved, for example, by a configuration as shown in FIG. 4.

A stepped through hole 30 having a small diameter at the top and a large diameter at the bottom is bored in the center of the mounting plate 29 to be fixed to the base plate 10 using bolts 28 or the like.
A mounting shaft 32 having a flange 31 at the lower end is inserted from below. Further, this mounting shaft 32 has an axial screw hole 33 bored therein. The mounting shaft 32 has its flange 31 in contact with the stepped portion 34 of the stepped through hole 30 and cannot move further in the axial direction; however, the thickness B of the flange 31
and the axial length C of the large diameter portion of the stepped through hole 30 so that it can move downward in the axial direction. A suitable collar 3 is attached to the upper part of this mounting shaft 32.
Compression coil spring 36 which is bullet A via 5
After inserting the screw shaft 37 protruding from the lower part of the non-directional rotating wheel 12 into the screw hole 33 of the mounting shaft 32. In this way, the ammunition A always acts to elastically expand the distance between the mounting plate 29 and the butt portion 12a of the non-directional rotating wheel 12, so that the non-directional rotating wheel 12 The result is that it can sink elastically relative to the plate 10. For example, if an excessive force is applied to the head of the non-directional rotating wheel 12 in the direction of the arrow in FIG. Destruction of the directional rotating wheel 12 or the rotating main ball 1
3. Plastic deformation of the small ball group 27 or the bowl-shaped seat body 26 is avoided.

It goes without saying that the method of intervening the above-mentioned ammunition A is not limited to that shown in FIG. 4. That is, as another example, the mounting shaft 32
The same effect as above can also be obtained by extending the lower end further downward than shown in FIG. 4 and interposing a tension coil spring (not shown) between this extended lower end and the mounting plate 29. .

In FIG. 2, reference numeral 38 indicates a rib for providing rigidity to the top plate of the workbench 1.

Next, the operation of the present invention will be explained.

When the top of the non-directional rotary wheel 12 protrudes from the top plate 6, that is, when the workbench 1 of the present invention functions as a part of a conveyor, the workpiece carried onto the top plate 6. When an object is to be fixed on the workbench, the operator turns an appropriate switch (not shown) to lower the base plate 10 and cause the non-directional rotary wheel 12 to sink below the top plate 6. At this time, the object to be worked on comes into direct contact with the surface of the top plate, and due to the frictional resistance between the object to be worked on and the top plate 4, it becomes impossible to move freely on the top plate 4. That is, at this time, the workbench 1 becomes a mere workbench from being a part of the conveyor, and the worker transfers the work object from the conveyor to the workbench as in the past, and performs the work.
This eliminates the need to return the workpiece to the conveyor after the work is completed. Next, when the work is finished and it is desired to move the workpiece on the conveyor in order to proceed to the next process, the switch (not shown) is switched to raise the top of the non-directional rotary wheel 12 onto the top plate 6 again. That's fine. At this time, the workpiece is in contact only with the rotating main sphere 13, which can rotate without resistance and in no direction, so it can be easily moved. Also, if you want to change the direction of the workpiece during work, you can do the same thing.

Further, a plurality of non-directional rotating wheels 1 on the top plate 6
Even if the workpiece placed on the non-directional rotating wheels 12, 12 has a very large weight and its bottom surface does not have an accurate plane,
Since each of the rotating wheels 12 and the base plate 10 is configured to be able to sink elastically by the action of the bullet A interposed between the rotating wheel 12 and the base plate 10, the non-directional rotating wheel 12 can move toward the object to be worked on. sinks elastically according to the bottom shape of the Therefore, it is possible to avoid a situation where huge pressure is applied to only a part of the non-directional rotating wheels due to the unevenness of the bottom surface of the workpiece, and the rotating wheels are destroyed.

As described above, the workbench of the present invention can be made thinner by reducing its top and bottom thickness by particularly devising the configuration of the fluid pressure cylinder that drives the bedplate that supports the non-directional rotating wheel. for example,
It can be placed on a conveyor table side by side with a roller conveyor, or it can be applied to the loading section of a forklift as described later.

In other words, the cylinder on the workbench of the present invention is
A downwardly open cylinder block having a through hole in the upper bottom is fixed face down to the bottom plate of the workbench main body, and the bottom plate is essentially used as the bottom wall of the cylinder space. Therefore, the upper and lower thickness of the workbench can be saved by an amount corresponding to the bottom wall of a general cylinder, and cost reduction can also be expected by reducing the number of parts. Of course, this means that the bottom plate constitutes the bottom wall of the cylinder space in terms of strength, so when a thin plate or packing for sealing, for example, is sandwiched between the cylinder block fixed face down and the bottom plate, are included in the scope of the present invention.

In addition, since it has a flat bottom plate that is integrated with the top plate on which the main rotating ball of the non-directional rotary wheel can come and go, the workbench of the present invention is a box-shaped unit, and can be used on a horizontal place. There is no need to carry out any construction work at the installation site, and the range of its use is therefore significantly expanded.

Moreover, the workbench of the present invention has a bullet interposed between each of the non-directional rotating wheels and the base plate,
Each of the rotating parts of each non-directional rotating wheel is configured to be able to elastically descend relative to the base plate, so that the bottom shape of the non-directional rotating wheel allows the heavy object to be placed on it to move downward. It can sink elastically according to the As a result, even if the bottom surface of the heavy object to be transported has irregularities, it is possible to avoid causing a huge unbalanced load to act on a part of the non-directional rotating wheel and causing it to break. As a result, heavy objects can be transported without problems and with low resistance in a state where the rotary wheel protrudes from the upper surface of the base plate.

Since the workbench of the present invention is itself thin, it can be used, for example, as a loading section of a forklift. That is,
Forklifts usually have a structure that allows them to move objects placed on a so-called pallet (a pedestal with a gap into which the fork part of the forklift is inserted). For example, the pallet is no longer necessary,
You can expand the field of use with this riff.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall perspective view with a part cut away to show the internal structure, FIG. 2 is an enlarged sectional view taken along the line -- in FIG.
This figure is a cross-sectional view showing the non-directional rotating wheel shown in FIG. 2 in a state in which it projects upward, and FIG. 4 is a cross-sectional view of the non-directional rotating wheel. 1...Workbench, 6...Top plate, 8...Bottom plate, 10
... Base plate, 11 ... Through hole, 12 ... Non-directional rotating wheel, 13 ... Rotating main ball, 9 ... Cylinder, 14
...Piston rod, 15...Guide hole, 16...
...Cylinder block, 18...Cylinder chamber,
19...Cylinder piston, 20...Pipe line, A
...A bullet.

Claims (1)

[Claims for Utility Model Registration] Flat top plate 6 with a plurality of through holes 11...
A base plate 10 to which a plurality of non-directional rotary wheels 12 are fixed is disposed below the through holes 11, and this base plate 10 is driven by fluid pressure. By driving the cylinders 9 up and down, the rotating main balls 13 of the non-directional rotating wheels 12 protrude from the through holes 11, and the rotating main balls 1 of the non-directional rotating wheels 12 protrude from the through holes 11.
In this workbench, a flat plate-like bottom plate 8 is provided further below the table plate 10 and is integral with the top plate 6, and a piston rod 14 is retracted from the upper part of the bottom plate 6. Guide hole 1
A hollow cylinder block 16 with an open bottom 5 is fixed in a face-down manner to form a cylinder chamber 18 substantially by the bottom plate 8 and the hollow cylinder block 16.
A cylinder piston 19 having a piston rod 14 fitted into the guide hole 15 is fitted so as to be movable up and down, while the lower surface of the base plate 10 is substantially brought into contact with the upper surface of the piston rod 14, and the cylinder piston 19 is A pressure fluid conduit 20 is connected to the chamber 18 so that the cylinder piston 19 can move up and down when pressurized, and an ammunition A is connected between each of the non-directional rotating wheels 12 and the base plate 10. A workbench characterized in that each of the rotating parts of the non-directional rotating wheels 12 can be elastically lowered with respect to the base plate 10 by being interposed therebetween.