JPH10277860A - Structure of valve of adsorptive type table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount and dismantle a blind lid quickly to/from a recess into which the lid is fitted, of a suction hole and increase the suction attachment force for a work piece to be processed through enlargement of the suction area of each suction hole. SOLUTION: A table 10 of an adsorptive type is provided at a specified pitch with step-form suction holes 12 which has internally a negative pressure chamber 11 and has a large diametric recess 12a and a small diametric communication hole 12b in the upper and lower parts of the upper wall 10a, and a blind lid 14 is fitted removably into the recess 12a. In this valve structure of the suction type table, the oversurface of the upper wall 10a is equipped with an operating recessed part 13 extending outward in the radial direction from the periphery of the recess 12a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a valve portion of a suction type table for holding a workpiece such as a plate material on an upper surface of the table by suction.

[0002]

2. Description of the Related Art FIGS. 11 to 13 show a conventional technique. In FIG. 11, reference numeral 1 denotes a negative pressure chamber 2 inside.
A plurality of suction holes 4 communicating with the negative pressure chamber 2 are formed at a predetermined pitch in an upper wall 1a of the table. Each suction hole 4 is formed as a stepped hole having a large-diameter concave portion 4a at the top. A disc-shaped blind lid 5 is detachably fitted into the recess 4a. The blind lid 5 is formed to have a slightly smaller diameter than the inner diameter of the concave portion 4a and slightly smaller than the depth of the concave portion 4a.
As shown in FIG. 13, a sheet 5b such as a sponge is fixed to the lower surface of a main body 5a made of a magnetic material such as a metal plate. Reference numeral 3 denotes a connection port connected to a suction blower (not shown).

[0003] Of the suction holes 4, a predetermined suction hole 4-1 facing the workpiece W removes the blind lid 5 and opens it, and the remaining suction hole 4-2 has a concave portion. The blind lid 5 is fitted to 4a and closed. In this state, the suction blower is operated to suck and hold the workpiece W through the suction hole 4-1.

[0004]

In the prior art, the outer diameter of the blind cover 5 was close to the inner diameter of the concave portion 4a of the suction hole 4, and the finger was put on the blind cover 5 to separate from the concave portion 4a. In this case, the blind lid 5 is attracted by a tool with a magnet (not shown) to be separated from the recess 4a. For this reason, a special tool is required, and the recess 4a of the blind lid 5 is required.
There was a drawback that the operation of detaching from the vehicle could not be performed quickly. Also,
When small dust (swarf) intervenes between the outer periphery of the blind lid 5 and the inner periphery of the recess 4a, there is a disadvantage that the blind cover 5 is hard to be detached from the recess 4a. Further, the size of the blind lid 5 is limited due to handling and the like, and the area of the concave portion 4a of the suction hole 4, that is, the suction force per suction hole 4 cannot be increased. In order to maintain the suction force per unit area at a predetermined value, it is necessary to increase the number of suction holes 4, and the number of blind lids 5 is increased, so that there is a disadvantage that the work of attaching and detaching the blind lids is troublesome. SUMMARY OF THE INVENTION It is an object of the present invention to obtain a novel structure of a blind lid portion of a suction-type table which has solved the above-mentioned disadvantages.

[0005]

Means for Solving the Problems In order to achieve the above object, the present invention is configured as follows. That is, there is provided a suction-type table having a negative pressure chamber therein, and a stepped suction hole having a large-diameter concave portion and a small-diameter communication port formed in the upper wall at upper and lower sides at predetermined pitches, and the suction type table is provided. In the structure of the valve portion of the suction type table in which the blind lid is detachably fitted in the concave portion of the hole, an operation concave portion extending radially outward from the outer periphery of the concave portion is provided on the upper surface of the upper wall. It was done. Preferably, the depth of the operation concave portion is shallower than the concave portion of the suction hole and lower than the upper surface of the blind lid fitted in the concave portion. Further, the operation concave portion may be formed so as to extend radially outward from a part of the outer periphery of the concave portion, or radially outward coaxially with the concave portion from substantially the entire outer periphery of the concave portion. It may be formed by extending. In addition, it is preferable to provide a finger hook protruding in the direction of the operation concave portion at an upper portion of the outer periphery of the blind lid. Further, it is preferable to provide a stopper that projects downward at the center of the blind lid and fits into the communication port of the suction hole.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view of a main part showing a first embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a sectional view of a main part showing a second embodiment of the present invention, and FIG. Plan view, FIG. 5
FIG. 6 is a sectional view of a main part showing a third embodiment of the present invention, FIG. 6 is a plan view of FIG. 5, FIG. 7 is a side view showing a first embodiment of a blind lid according to the present invention, and FIG. FIG. 9 is a side view showing a second embodiment of the blind lid according to the present invention, and FIG. 10 is a side view showing a third embodiment of the blind lid according to the present invention.

1 and 2, reference numeral 10 denotes a table in which a negative pressure chamber 11 is formed. The negative pressure chamber 11 is connected to a suction port of a blower (not shown) through a connection port 11a opened in a bottom wall. It is connected to the. Upper wall 1 of the table 10
At 0a, a large number of suction holes 12 communicating with the negative pressure chamber 11 from outside are formed at a predetermined pitch. Each suction hole 12 is formed as a stepped hole having a large-diameter and circular concave portion 12a and a small-diameter and circular communication port 12b vertically concentric.

An operation recess 13 into which a worker's finger can be fitted is formed on the outer periphery of the recess 12a. This operation recess 13
Is slightly shallower than the recess 12a, and
As shown in FIG. 2, it is formed to extend rightward from the right half of the outer periphery of the concave portion 12a. Then, a disc-shaped blind cover 14 is detachably fitted into the recess 12a. This blind lid 14
Is formed by fixing a soft sheet 15, such as a sponge, to the lower surface of a main body 14a made of a metal plate. The upper portion of the main body 14a is positioned above the bottom surface of the operation concave portion 13 when fitted.

[0009] Of the above-mentioned suction holes 12, a predetermined suction hole 12-1 facing the workpiece W removes the blind cover 14 and opens it, and the remaining suction holes 12-2 are recessed. A blind lid 14 is fitted to 12a and closed. In this case, when removing the blind cover 14 from the suction hole 12-1, a finger is put into the operation concave portion 13 of the suction hole 12-1, and a finger is put on the upper edge of the corresponding blind cover 14 from this portion. The blind lid 14 is detached from the recess 12a. After the opening / closing operation of the suction holes 12 is completed, the suction blower is operated to apply the negative pressure in the negative pressure chamber 11 to the workpiece W through the suction holes 12-1. To adsorb. In this case, the suction hole 12-
The suction area of 1 is the sum of the concave portion 12a and the operation concave portion 13, and the suction force of the workpiece W is increased.

FIGS. 3 and 4 show a second embodiment. This is formed by making the operation recess 13 slightly shallower than the recess 12a of the suction hole 12 and extending radially outward from the entire outer periphery of the recess 12a concentrically with the recess 12a. Further, the blind cover 1 detachably fitted in the concave portion 12a.
4, as shown in FIG. 7, an annular groove 14 b is formed at the middle part in the thickness direction of the outer periphery of the main body 14 a, and protrudes outward in the radial direction (in the direction of the operation recess 13) on the outer periphery of the main body 14 a by the annular groove 14 b. The finger hook 14c is formed.

According to the second embodiment, since the operation concave portion 13 exists in the entire outer peripheral portion of the suction hole 12, the position where the finger is inserted when the blind cover 14 is removed is not limited. Also,
Since the finger hook 14c is formed on the upper part of the outer periphery of the blind lid 14, the work of removing the blind lid 14 can be performed more easily.

FIGS. 5 and 6 show a third embodiment. In this device, four operation recesses 13 (13a) extending in a fan shape from the outer periphery of the recess 12a and extending radially outward are formed in the circumferential direction, and a small width rib 10b is formed between each operation recess 13a. . The depth of each operation concave portion 13a is the concave portion 12 of the suction hole 12.
a, and the height of each rib 10 b is the same as the height of the upper wall 10 a of the table 10.

As shown in FIG. 9, the blind cover 14 detachably fitted in the recess 12a is projected downward at the center of the lower surface of the main body 14a so as to be fitted in the communication port 12b of the suction hole 12. Of the main body 1
An annular groove 14b is formed at an intermediate portion in the thickness direction of the outer periphery of 4a, and a finger hook 14c protruding radially outward (toward the operation recess 13) is formed at an upper portion of the outer periphery of the main body 14a by the annular groove 14b.

According to the third embodiment, each operation recess 13
a, there is a small width rib 10b between the ribs 10b.
Supports the suction portion of the workpiece W, and the thin workpiece W is less likely to curve downward at the suction portion. In addition, blind cover 1
4 is formed on the lower surface of the communication hole 1 of the suction hole 12.
2b, when removing chips on the table by the air jetted by the air gun, the concave portion 12a
The blind lid 14 fitted to the above is prevented from being inadvertently detached by the jet air. Further, since each of the operation concave portions 13a exists in substantially the entire outer peripheral portion of the suction hole 12, the position where the finger is inserted when the blind cover 14 is removed is not limited.
Is formed at the upper part of the outer periphery of
The operation of removing the blind lid 14 can be performed more easily.

The blind lid 14 is, as shown in FIG.
A hemispherical plug 14d that can be fitted into the communication port 12b is integrally formed at the center of the lower surface of the disk-shaped main body 14a, and the main body 14a
The outer peripheral surface is smoothed and the finger hook 14c is omitted,
The soft sheet 15 may be fixed to the lower surface of a.

[0016]

As is apparent from the above description, according to the present invention, since the operation concave portion into which the finger is fitted is provided on the outer periphery of the concave portion of the suction hole into which the blind lid is fitted, the blind lid is detached from the concave portion. At this time, this can be performed directly by hand, and the operation of opening and closing the suction hole can be performed quickly. In addition, the suction area of the suction hole is the sum of the concave portion and the operation concave portion, and the suction force of the workpiece increases. In addition, since the finger cover is provided on the upper part of the outer periphery of the blind lid, the blind lid can be quickly removed. Furthermore, since the blind lid is provided with a plug portion that fits into the communication port of the suction hole, the effect that the blind lid does not accidentally come off from the recess when removing chips on the table by jetting air is provided. To play.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a first embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional view showing a main part of a second embodiment of the present invention.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a sectional view showing a main part of a third embodiment of the present invention.

FIG. 6 is a plan view of FIG. 5;

FIG. 7 is a side view showing a first embodiment of a blind lid according to the present invention.

FIG. 8 is a plan view of FIG. 7;

FIG. 9 is a side view showing a second embodiment of the blind lid according to the present invention.

FIG. 10 is a side view showing a third embodiment of the blind lid according to the present invention.

FIG. 11 is a sectional view of a main part showing a conventional example.

FIG. 12 is a side view of a blind lid according to a conventional example.

FIG. 13 is a plan view of FIG.

[Explanation of symbols]

 Reference Signs List 10 Table 10a Upper wall 11 Negative pressure chamber 11a Connection port 12 Suction hole 12a Depression 12b Communication port 13 Operation depression 14 Blind lid 14a Main body 14b Annular groove 14c Finger hook 14d Plug 15 Sheet W Workpiece

Claims (6)

[Claims] A negative pressure chamber (11) is provided inside, and an upper wall (1) is provided.
0a), a large-diameter concave portion (12a) and a small-diameter communication port (12a).
b) is provided with a suction-type table (10) in which stepped suction holes (12) having upper and lower portions are formed at a predetermined pitch, and a blind lid (14) is formed in a concave portion (12a) of each suction hole (12). In the structure of the valve portion of the suction type table, which is detachably fitted, the concave portion (12) is formed on the upper surface of the upper wall (10a).
a) The operation concave portion (1) extending radially outward from the outer periphery of (a).
(3) The structure of the valve portion of the suction type table, wherein (3) is provided. 2. The operation recess (13) is shallower than the recess (12a) of the suction hole (12) and has a depth (12).
2. The structure of the valve portion of the suction type table according to claim 1, wherein the position is lower than the upper surface of the blind lid (14) fitted in a). 3. The operating recess (13) is provided with the recess (12).
3. The structure of the valve portion of the suction-type table according to claim 1, wherein the valve portion is formed so as to extend radially outward from a part of the outer periphery of a). 4. The operating recess (13) is provided with the recess (12).
4. The valve part of a suction type table according to claim 1, wherein the valve part is formed so as to extend radially outward concentrically with the concave part (12a) from substantially the entire area of the outer periphery of a). Construction. 5. The suction type according to claim 1, wherein a finger hook (14c) protruding in the direction of the operation recess (13) is provided at an upper portion of an outer periphery of the blind lid (14). Table valve structure. 6. A stopper (14d) is provided at the center of the blind lid (14) to protrude downward and fit into the communication port (12b) of the suction hole (12). 6. The structure of the valve section of the suction-type table according to any one of items 1 to 5.