JPH058280Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a vacuum suction unit installed in a day stacker that lifts stacked thin plates one by one to send them to the next process.

(Prior Art) Conventionally, as a day stacker equipped with a vacuum suction unit, those shown in FIGS. 2 and 3 are known. For example, in the process of pressing thin plates (workpieces), a stack of thin plates placed on a stack lifter using a crane or the like is lifted by the thickness of each thin plate, and the stacker above it picks up each plate one by one. It is lifted up and introduced into the washing machine by a magnetic suction conveyor that passes through that position.
Next, it is sent to a fixed position in a feeding station, and inserted into a pressing process by a loader provided in a press device. A suitable number of vacuum suction units to which the present invention relates are juxtaposed in the day stacker.

As shown in Fig. 2, the conventional vacuum adsorption unit includes a type unit 1 which is connected to a vacuum pump and uses its vacuum force to adsorb a thin plate, and each unit is equipped with an air cylinder 2 and can move up and down. As shown in Fig. 3, there is a self-adsorption type unit 3 that does not use a vacuum pump, and the latter unit 3 is disclosed, for example, in Japanese Utility Model Application No. 50-46865. Common unloading member 4 provided
The adsorption was released by . Note that each suction unit is equipped with a suction member made of flexible rubber at the lower end.

(Problem to be solved by the invention) As mentioned above, when using a vacuum pump, when handling small workpieces, it is not necessary to use all of the adsorption units provided in the day stacker, and therefore the units that are not used are Air cylinder 2
Although it has the advantage of being able to be raised upwards, it has the disadvantage that the device becomes bulky because a vacuum pump is used and each is equipped with an air cylinder. In addition, in the self-adsorption type, the suction unit 3 cannot be used selectively, and all suction units are used regardless of the size of the workpiece. Therefore, as shown in FIG. There was a problem in that the suction member of the suction unit that was on the edge was damaged.

The purpose of the present invention is to solve the problems of the prior art described above, and therefore to provide a self-adsorption type unit that can be used selectively.

(Means for Solving the Problems) The configuration that characterizes the vacuum suction unit according to the present invention is that it has a suction member 13 made of rubber or the like at the lower end, and a vertical main shaft 11 with a center hole and a piston 14; A first cylinder 15 in which a piston slides in an internal space in a sealed manner, a second cylinder 16 located above the first cylinder 15 and communicating with the center hole of the main shaft, and a closing member at the upper end of the second cylinder. It also includes a release member 23 that communicates the inside of the second cylinder with the outside when pressed down, a spring 21 that pushes the main shaft downward, and a port 22 that introduces pressurized gas to the underside of the piston in order to push up the main shaft. That's true.

(Effect of the above means) When suctioning a thin plate-shaped workpiece, if the suction member at the lower end of the spindle is pressed against the workpiece while keeping the inside of the second cylinder airtight, the pressure inside the suctioning member will be lower than that of the outside air, so that the workpiece can be sucked. Adsorb. When the release member 23 is pushed down, outside air is introduced into the second cylinder from the port 27 and the gap 26 provided in the closing member at the upper end, and also into the suction member 13 through the center hole 12 of the main shaft. Outside air is introduced and the vacuum is removed, so the suction is released. When not in use, pressurized gas is supplied to the piston 14 from the port 22.
The main shaft and the suction member 13 can be maintained in the raised position by introducing the suction member 13 into the lower side.

(Embodiment) FIG. 1 shows a preferred embodiment of the present invention, in which a suction unit 10 is installed on a support 5 that is moved up and down by a suitable drive device such as an air cylinder. As shown in the drawing, the suction unit 10 according to the present invention has a vertical main shaft 11, which has a center hole 12 on the axis, and a downward cup-shaped suction member 13 made of flexible rubber or plastic at the lower end. is installed. The center hole 12 of the main shaft is the center hole 13 of the suction member 13.
It communicates with the inside of the adsorption member 13 via a. Further, a piston 14 is fixed at an appropriate position on the main shaft 11. The main shaft 11 is installed coaxially with a pair of sealed cylinders 15 and 16 arranged above and below, and is movable vertically.

The lower cylinder 15 has a closing member 17 at its lower end.
Both ends of the upper cylinder 16 are sealed by a closing member 18 interposed between the cylinders, and both ends of the upper cylinder 16 are sealed by the closing member 18 and a closing member 19 at its upper end. The main shaft 11 is the lower cylinder 1
5 and its upper end protrudes into the internal space of the upper cylinder 16. A piston 14 fixed to the main shaft 11 is located in a lower cylinder 15 and slides against the inner circumferential surface of the lower cylinder 15 in a sealed manner by sandwiching an O-ring 20 around the piston. A compression spring 21 is provided between the piston 14 and the closing member 18 above it, which presses the main shaft 11 downwards together with the piston 14. The lower end closure member 17 has a port 22 for conveying pressurized gas to the underside of the piston 14. Air is usually used as the gas.

Also, a closing member 19 at the upper end of the upper cylinder 16
is provided with a generally rod-shaped release member 23 that sealingly passes through the release member 23 and is slidable up and down.
By pressing down, the inside of the cylinder 16 is communicated with the outside. Therefore, preferably as shown in FIG.
A frustum-shaped flange portion 24 is provided at the lower end of the cylinder 3, and the portion 24 contacts a sealing material 25 provided on the lower surface of the hole of the closing member 19, thereby sealing the inside of the cylinder 16. It's summery.
A port 27 is formed in the upper end of the closing member 19 and can communicate with the inside of the cylinder 16 through a gap 26, and a filter 28 is installed at the inlet of the port 27. Further, a compression spring 29 is installed between the lower surface of the flange portion 24 and the intermediate closing member 18, and constantly pushes the release member 23 upward and presses the sealing material 25 to seal the inside of the cylinder 16. In addition, in the figure,
30 is a sealing material that seals between the periphery of the release member 23 and the closing member 19.

When suctioning a workpiece with the suction member 13, as shown in FIG. Therefore, the pressure inside the cylinder 16 and the suction member 13 becomes lower than that of the outside air through the center hole 12 of the main shaft, so that the workpiece is suctioned. When releasing the workpiece, it is sufficient to press down the release member 23 using the common unloading member 31, and thereby the port 2
7 and the gap 26, outside air is introduced into the cylinder 16, and air is also supplied into the suction member 13 through the center hole 12 of the main shaft, thereby canceling suction.

When this unit 10 is not used, port 2
Pressurized gas is introduced from 2 to the lower side of the piston 14 to raise the adsorption member 13 together with the main shaft 11 to the position 13'. In this state, even if another unit attached to the support body 5 comes into contact with the work, this unit 10 will not come into contact with the work.

(Effects of the invention) As described above, according to the invention, the structure is simple and lightweight because it is a self-adsorption type that does not use a vacuum pump, and the suction member surrounds the main shaft to which the adsorption member is attached. By introducing pressurized gas from a port into the lower side of the piston attached to the main shaft in the first cylinder, the adsorption member can be raised together with the main shaft and held in an unused state. This makes it possible to dispense with the use of vacuum suction units that are unnecessary or located in inconvenient positions, and thus eliminates the need to operate all the suction units provided in the destacker. Therefore, there is no drawback that the suction member hits the edge of the workpiece and is damaged, unlike the conventional method.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a vacuum suction unit according to an example of the present invention, FIGS. 2 and 3 are elevational views of a day stacker equipped with a conventional suction unit, and FIG. 4 shows the drawbacks of the prior art. It is a partial elevational view. In the figure, 11...Main shaft, 12...Center hole, 1
3... Adsorption member, 14... Piston, 15... First cylinder, 16... Second cylinder, 19...
...Closing member, 21... Spring, 22... Port.

Claims (1)

[Scope of utility model registration request] a vertical main shaft having a center hole with a suction member at the lower end; a piston fixed to the main shaft; and a first cylinder through which the main shaft passes and through which the piston slides in a sealed internal space. and,
A sealed internal space located on the first cylinder passes through a second cylinder communicating with the center hole of the main shaft and a closing member at the upper end of the second cylinder and resists the elasticity of the spring. a release member that communicates the interior space of the second cylinder with the outside when pressed down; a spring that pushes the main shaft downward; and a spring that is applied to the lower side of the piston in the first cylinder to push up the main shaft. A vacuum adsorption unit that includes a port for sending pressurized gas.