JPS63171712A - Working table - Google Patents

Abstract

PURPOSE:To enhance the safety and working efficiency with a working platform for box-shaped works which require processing to their front and rear faces, by orbiting a rectangular table by a crank shaft, and allowing it to rotate round its own axis at a speed higher than its speed. CONSTITUTION:If a crank shaft 12 is rotated to orbit a table 10, a chain 24 will run in the direction of the rotation. Because the chain 24, however, is meshing with a stationary sprocket 22 and can not move a driving sprocket 20 receives torque reversely to the orbiting and rotates round its own axis in the opposite direction to a revolving shaft 11. Because at this time the outside dia.of the stationary sprocket 22 is twice of the outside dia. of the driving sprocket 20, the rotating speed round the own axis is also twice of the orbiting speed. According to this constitution, working can be performed upon turning to the position 90 deg. leftwise or rightwise with respect to the position of belt conveyor 2. This accomplishes enhancement of safety and working efficiency.

Description

[Detailed description of the invention] , Production 1” J ■ Old 1 minute! The present invention relates to a workbench that is used to receive workpieces conveyed from a belt conveyor device and perform various operations on the workpieces, and more specifically, the present invention relates to a workbench that is used for receiving workpieces conveyed from a belt conveyor device and performing various operations on the workpieces. Regarding workbenches suitable for work.

Fig. 3 shows a conventional example of this type of workbench, in which a box-shaped workpiece W conveyed from the upstream side via a belt conveyor 2 on the upstream side corresponding to the right side in the figure is shown. The workpiece W is placed on a circular turning table 100, where work such as attaching predetermined parts to the front surface WF of the workpiece W located on the side of the operator M is first performed, and then the turning table 100 is rotated by 180 degrees. After the work on the rear surface WR is performed, the workpiece W is transferred to the belt conveyor 3 on the downstream side and conveyed downstream.

However, in the case of the conventional example described above, there are drawbacks described below, which pose problems in ensuring work safety and improving work efficiency. .

That is, ■If the work W is a long object, the turning table 10
Since the turning radius of the workpiece W that rotates with zero increases, there is a risk that the workpiece W will come into contact with the worker M and injure him.

(2) Since the turning table 100 is circular, the working position is shifted inward by the diameter of the turning table 100, forcing the worker M to work in a cramped posture such as leaning forward.

The present invention has been made to solve the drawbacks of the prior art, and an object thereof is to provide a workbench that can ensure work safety and improve work efficiency.

A workbench according to the present invention to solve the problem includes a rectangular table that receives a workpiece and is rotatable around a pivot axis, and a rectangular table that rotatably supports the pivot shaft and whose axis center a crankshaft having a rotating shaft portion at a position offset by a distance l; a drive mechanism for driving the crankshaft; a rotating disk rotatably supported on the rotating shaft; and a rotating disk coaxial with the rotating shaft portion. A fixed disk fixedly supported on fixed shafts arranged in a shape and having a diameter approximately twice that of the rotating disk, and means for connecting the rotating disk and the fixed disk. Become.

Here, the rotating disk and fixed disk refer to sprockets, V-pulleys, etc., and the connecting means refers to chains, belts, etc.

When the crankshaft is rotated, for example, by 90 degrees, the table is rotated by 180 degrees in the opposite direction to the direction of rotation of the crankshaft via the linking means. In other words, the table and the workpieces placed thereon rotate by an angle corresponding to the diameter ratio of the rotating disk and the fixed disk while revolving around the table.

Now, referring to FIG. 1, as shown in the figure, the crankshaft 12 is moved 90 degrees from the position A where the workpiece W is placed in the longitudinal direction with respect to the working position (the position of the worker M).
When the workpiece W rotates 0 degrees clockwise (forward), the workpiece W rotates 180 degrees counterclockwise (backward) as described above, so the workpiece W is placed on the opposite side of the working position. The rear surface WR of W occupies the position B opposite the working position. Then, when the crankshaft 12 is rotated 180 degrees counterclockwise from the position B, the work W will rotate 360 degrees clockwise, so that the front surface WF of the work W is at the position C opposite the working position. It will occupy the position.

Therefore, according to the above configuration, the front surface WF and rear surface WR of the workpiece W can be made to face the worker M simply by rotating the crankshaft 12. In this case, the workpiece W moves within the plane on the opposite side of the worker M around the rotating shaft portion 122 of the crankshaft 12.
It will turn within a 90 degree range.

Moreover, according to the above configuration, since the work W rotates in the opposite direction while revolving, the inertia at the time of stopping is canceled out, and the positional deviation of the work W with respect to the table 10 can be reduced as much as possible. become.

The present invention will be explained below based on the drawings. FIG. 1 is a plan view schematically showing a workbench according to the present invention (hereinafter referred to as the present invention table), and FIG. 2 is a partially cutaway front view thereof.

The table 1 of the present invention is provided on the downstream side of a belt conveyor 2 on the upstream side provided in the left-right direction in the figure, and a table 10 formed in a rectangular shape is used to store a workpiece W conveyed in the longitudinal direction on the belt conveyor 2. It is now accepted for publication. After completing a predetermined work, the workpiece W placed on the table 10 is transferred onto a downstream belt conveyor 3 provided downstream of the present invention table 1, and is conveyed downstream. As shown in the figure, the belt conveyor 3 on the downstream side is
In other words, it is provided with a conveying direction 90 degrees different from that of the belt conveyor 2 on the upstream side. In addition, in the figure, WF indicates the front surface of the workpiece W, and WR indicates the rear surface.

Next, details of the present invention stand 1 will be explained. A pivot shaft 11 is vertically attached to the center of the lower surface of the table 10. A lower portion of the pivot shaft 11 is rotatably supported by an upper end support portion 120 of the crankshaft 12. Specifically, the bearing 12 fitted to the upper and lower end parts of the upper end support part 120
It is rotatably supported by 3.123.

The crankshaft 12 includes the upper end support portion 120, a crank arm 121 extending from the lower end of the upper end support portion 120 to the left side in the figure, and a rotating shaft portion 122 extending vertically from the lower end of the crank arm 121. It becomes. The center of the upper end support part 120,
In other words, the axial center of the turning shaft 11 and the axial center of the rotary shaft portion 122 are offset by a distance l. The rotating shaft part 122 is the fixed base 1
It is rotatably supported by a support tube 14 fixed to 3. Specifically, it is rotatably supported by bearings 15 and 15 fitted to the upper and lower ends of the support tube 14. A lower end portion of the rotating shaft portion 122 projects below the support cylinder 14, and a gear 16 is fitted to the projecting end. The gear 16 meshes with a pinion 19 fitted onto an output shaft 18 of an electric motor 17. The drive of the electric motor 17 is controlled by a motor drive control circuit (not shown).

Thus, when the electric motor 17 is driven, the crankshaft 1
2 rotates around the rotating shaft portion 122, and the table IO and the workpiece W placed thereon revolve around the axis of the rotating shaft portion 122.

A driving sprocket 20 is fitted to the upper end of the rotating shaft 11. On the other hand, a support plate 21 made of angle material is erected at a position corresponding to the left side of the support tube 14 of the fixed base 13, and a fixed sprocket 22 is provided on the upper side of the support plate 21.
A fixed shaft 23, which is fixed to the upper end, is fixedly supported. The fixed shaft 23 is disposed approximately in the same ring as the rotating shaft portion 122 of the crankshaft 12 . The outer diameter of the fixed sprocket 22 is selected to be twice the outer diameter of the driving sprocket 20, and an endless chain 24 is wound between both sprockets 20 and 22.

When the crankshaft 12 is rotated as described above and the table 10 is revolved, the chain 24 tries to move around in the direction of rotation, but since the chain 24 is meshed with the fixed sprocket 22, it cannot move. There's nothing to do. Therefore, a rotational torque opposite to the revolution direction is applied from the chain 24 to the drive sprocket 20, and as a result, the pivot shaft 11, that is, the table 10, rotates in the opposite direction to the revolution direction. Since the outer diameter of the fixed sprocket 22 is selected to be twice the outer diameter of the driving sprocket 20 as described above, this rotational speed, that is, the rotation angle, is twice the rotation angle of the crankshaft 12. value.

Next, a case will be described in which work is performed using the table 1 of the present invention. The table 10 is stopped at the position A shown in FIG. 1, and in this state, the workpiece W conveyed from the upstream belt conveyor 2 is loaded.

Next, a predetermined drive command signal is issued to the electric motor 17 from the electric motor drive control circuit, and the crankshaft 12 is moved forward by 9.
You can rotate the plane by 0 degrees. Then, as described above, the table 10 will revolve forward and rotate backward, and the table 10 will occupy position B, and
The rear surface WR of the workpiece W faces the worker M.

When the work such as attaching a predetermined part to the rear surface WR is completed, the completion of the work is reported to the motor drive control circuit. Then, the electric motor drive control circuit receives this and issues a predetermined drive command signal to the electric motor 17, and the crankshaft 1
2 will be rotated 180 degrees to the rear. In this state, table IO occupies position C, and workpiece W
The front surface WF of will face the worker M. and,
The workpiece W on which the work on the front surface WF has been completed is transferred onto the belt conveyor 2 on the downstream side by means not shown, and is conveyed downstream.

In the case of the above configuration, the turning radius of the table 10 does not extend to the working position, that is, the position of the worker M, making it possible to have a large working space and providing a shelf for storing parts etc. near the working position. Therefore, it is convenient for improving work efficiency.

Although the illustrated embodiments are as described above, the present invention is not limited to the above embodiments. For example, instead of the chain sprocket mechanism, the table 10 may be rotated by a belt pulley mechanism. The present invention may also be applied to a conveyance system in which an upstream belt conveyor and a downstream belt conveyor are arranged in a straight line, as in the conventional example described above. It goes without saying that the present invention can also be applied to a transport system in which the workpiece W is received and transferred onto the table 10 using a robot arm, an overhead crane, or the like. Furthermore, it goes without saying that the present invention can be applied not only to the box-shaped workpiece W but also to other shapes of workpieces.

In the case of the present invention, which is more than a full plate plan, the turning radius of the table and workpiece does not extend to the working position, so even if the workpiece is long, there is no risk of injury to the worker, and work safety is ensured. This means that it is possible to secure the following.

Furthermore, since the long side of the rectangular table and the long side of the workpiece face the worker, which allows the worker to approach the workpiece, it is difficult to take an awkward working posture. This will allow you to work without any problems. Therefore, workability can be significantly improved compared to the conventional example described above.

[Brief explanation of the drawing]

1 and 2 show embodiments of the present invention.
The figure is a plan view schematically showing a workbench according to the present invention, and FIG. 2 is a partially cutaway front view thereof. FIG. 3 is a schematic plan view showing a conventional example. 10...Table 11...Swivel shaft 12...Crankshaft 122...Rotating shaft portion 17...Electric motor 20...Drive sprocket 22...Fixed sprocket 24...Chain W... work

Claims (1)

[Claims] (1) A rectangular table that receives a workpiece and is rotatable around a pivot axis, and a rectangular table that rotatably supports the pivot shaft;
a crankshaft having a rotating shaft portion at a position offset by a distance l from the axis of the crankshaft; a drive mechanism for driving the crankshaft; a rotating disk rotatably supported on the rotating shaft; a fixed disk fixedly supported on a fixed shaft disposed coaxially with the shaft portion and having a diameter approximately twice that of the rotating disk; and means for connecting the rotating disk and the fixed disk; A workbench characterized by comprising: