JPH11291188A - Vibratory suction cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibratory suction cylinder which can take out stacked sheets one by one positively and feed them to a prescribed position. SOLUTION: A piston 5 is incorporated into a cylinder 1, and a suction pad 8 communicating with the inside of a rod is mounted at a lower end of a piston rod 6. An air supply port 13' and an intake/exhaust port 16 are mounted on the cylinder 1. A head part 27 and a pilot port 28 are formed at a pilot valve 26, and a fixed throttle valve 36 is mounted on the inlet of a passage 32. Suction force is applied to the intake/exhaust port 16 to drop the piston 5, and a sheet is sucked by the suction pad 8 to be moved upward. While the sheet is moving upward, a change in pressure occurs in a second chamber 10b under a pilot valve seat 24 by an action that the piston 5 pushes up the pilot valve 26 for vibrating the piston 5 vertically. It is thus possible to release a stack of sheets by vibrating them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration suction cylinder for sucking and conveying a sheet-like material such as paper.

[0002]

2. Description of the Related Art A suction cylinder described in Japanese Utility Model Publication No. 56-36633 has been conventionally known as a suction cylinder for sucking stacked sheets of paper or the like one sheet at a time from the top and taking out the sheets upward. ing.

[0003] In the suction cylinder, when the suction pad is lowered by the supply of compressed air and the suction pad comes into contact with a sheet-like material, the suction cylinder sucks the sheet-like material and simultaneously moves upward. The configuration is simple,
The feature is that the operation is reliable.

[0004]

In the above-mentioned suction cylinder, since the suction pad for sucking the sheet-like material simply moves up and down by a predetermined stroke, the stacked sheet-like materials come into close contact with each other, or the static electricity may be disturbed. If the sheet-like material is sucked, the sheet-like material may be lifted in an overlapping state, and there is still a point to be improved in reliably taking out and transporting the sheet-like material one by one.

[0005] It is an object of the present invention to provide a vibration-absorbing cylinder capable of taking out only one sheet to a predetermined height, even if sheets are taken out in an overlapping state.

[0006]

In order to solve the above-mentioned problems, the present invention incorporates a piston having a cylindrical piston rod in a cylinder, and a spring for pressing the piston upward. Has an air supply port communicating with an upper part of an upper chamber formed above the piston, and an intake / exhaust port communicating with a lower part of a lower chamber formed below the piston, and has a lower part of the cylinder. A suction pad communicating with the inside of the piston rod is attached to the lower end of the piston rod positioned below the cylinder through the rod cover, and the piston is connected to the upper chamber through the inside of the piston rod. A valve port and a piston port for communicating the upper chamber and the lower chamber are formed, and a lock for communicating the inside of the rod with the lower chamber is formed above the piston rod. A port is provided, and when the pressure in the upper chamber becomes lower than the pressure inside the piston rod at the check valve port, in an adsorption cylinder incorporating a check valve that opens the check valve port, the upper chamber is placed in the upper chamber. A pilot valve seat that partitions the first and second chambers is fixed, and a head that is received on an upper surface of the pilot valve seat is provided above a pilot valve that slidably penetrates the pilot valve seat. Adopts a configuration in which a pilot port for communicating the first chamber and the second chamber is formed when the head is separated above the pilot valve seat.

With the above-described structure, when a sheet-like object is suctioned and conveyed in a state where low-pressure air is supplied to the air supply port, the suction pad adsorbs and lifts the sheet-like object. On the way, the piston vibrates up and down. That is, when the piston rises, the pilot valve is pushed up, and the first port communicates with the second chamber through the pilot port, so that the pressure in the second chamber increases. The communication between the first chamber and the second chamber is cut off, and the cutoff causes air in the second chamber to be sucked into the lower chamber via the piston port. Therefore, the piston rises again to push up the pilot valve, and the above operation is repeated. This causes the piston to vibrate up and down.

For this reason, if several sheets of material adsorbed on the suction pad are in a state of being overlapped, the sheet is separated and one sheet is held by the suction pad.
The single sheet can be lifted by the piston stroke.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG.
Consists of a cylinder tube 2, a head cover 3 attached to the upper end thereof, and a rod cover 4 attached to the lower end of the cylinder tube.

A piston 5 is slidably assembled in the cylinder 1, and a cylindrical piston rod 6 connected to the lower surface of the piston 5 is slidably inserted into a rod insertion hole 7 formed in the rod cover 4. ing. A suction pad 8 is attached to a lower end of the piston rod 6, and the suction pad 8 is provided with a suction hole 9 communicating with the inside of the piston rod 6.

The interior of the cylinder 1 is partitioned into an upper chamber 10 and a lower chamber 11 by incorporating the piston 5 therein.
A spring 12 that pushes the piston 5 upward is incorporated in the first embodiment.

An upper chamber 10 is provided on the head cover 3 of the cylinder 1.
A two-port two-position switching valve 15 is connected to an air supply pipe 14 connected to the air supply port 13.

On the other hand, an intake / exhaust port 16 is provided in the rod cover 4 of the cylinder 1 so as to communicate with the lower chamber 11. The intake / exhaust port 16 communicates with an ejector passage 17 and is connected to an inlet of the ejector passage 17. The three-port two-position switching valve 19 is connected to the air supply pipe 18.

The piston 5 has a projection 20 on the upper surface. The piston 5 has an upper chamber 10 and a piston rod 6.
And a piston port 22 communicating the upper chamber 10 and the lower chamber 11 are provided. Check valve 2 incorporated in check valve port 21
3 opens the check valve port 21 when the pressure in the upper chamber 10 becomes lower than the pressure inside the piston rod 6. Above the piston rod 6, the inside of the rod 5 and the lower chamber 1
1 is provided with a rod port 33 communicating therewith.

A pilot valve seat 24 is fixed to the upper chamber 10, and the upper chamber 10 is divided into a first chamber 10a and a second chamber 10b by the pilot valve seat 24. An insertion hole 25 penetrating vertically is formed in the pilot valve seat 24, and a rod-shaped pilot valve 26 is slidably inserted into the insertion hole 25.

The pilot valve 26 has a head 27 that is received on the upper surface of the pilot valve seat 24. A pilot port 28 is formed in the pilot valve 26, and the pilot port 28 opens at the upper and lower ends of the outer periphery of the pilot valve 26. The pilot valve 26 rises and the head 27 rises from the upper surface of the pilot valve seat 24. When separated, the upper opening is opened, and the first chamber 10a and the second chamber 10b communicate with each other by the pilot port 28.

A vibration adjusting valve 29 is slidably incorporated in the first chamber 10a above the head 27 of the pilot valve 26. The vibration adjusting valve 29 is connected to the pilot valve 26.
Has a recess 30 on its lower surface in which the upper part of the
Before the head 27 of the pilot valve 26 comes into contact with the bottom surface of the pilot valve 26, the upper opening of the pilot port 28 opens in the recess 30.

The vibration adjusting valve 29 has the recess 30 and the air supply chamber 3 provided on the vibration adjusting valve 29.
There is a passage 32 that communicates with the valve 1, and a fixed throttle valve 36 is provided at the entrance of the passage 32.

The vibration suction cylinder shown in the embodiment has the above-described structure. When the sheet-like material P stacked in the magazine 40 is sucked and conveyed, the three-port two-position switching valve 19 is switched to the air supply position. The compressed air is supplied from the air supply pipe 18 to the ejector passage 17. On the other hand, by switching the 2-port 2-position switching valve 15 to the air supply position, a low positive pressure from the air supply pipe 14 to the air supply chamber 31, for example,
A low-pressure compressed air of about 0.5 kg / cm ² is supplied.

When compressed air is supplied to the ejector passage 17, a suction force acts on the intake / exhaust port 16, and the air in the lower chamber 11 is sucked by the suction force. For this reason, lower room 1
1, the pressure drops.

At this time, since the lower chamber 11 and the second chamber 10b communicate with each other through the piston port 22, the second chamber 1
The air in the second chamber 10b is sucked into the lower chamber 11 side.
Is communicated with the outside through the suction hole 9 of the suction pad 8, the inside of the piston rod 6, and the check valve port 21, so that the second chamber 10b is maintained at approximately atmospheric pressure. For this reason, a pressure difference occurs between the second chamber 10b and the lower chamber 11, and
The pressure difference causes the piston 5 to descend against the elastic pressure of the spring 12.

On the other hand, since a low positive pressure is applied to the air supply chamber 31, the pilot valve 26 and the vibration adjusting valve 29 are lowered as the piston 5 is lowered.

FIG. 2 shows a state in which the suction pad 8 has been lowered to a position where it comes into contact with the upper surface of the stacked sheets P. At this time, the vibration adjustment valve 29 is connected to the pilot valve seat 2
4, the pilot valve 26 is in a stopped state with its head 27 received on the upper surface of the pilot valve seat 24, and the first chamber 10a and the second chamber 10b are in a non-communicating state.

As shown in FIG. 2, when the suction pad 8 comes into contact with the upper surface of the sheet material P, the lower chamber 11 is shut off from the outside. Acting on the second chamber 10b, the pressure in the second chamber 10b decreases. The check valve 23 opens due to the decrease in the pressure,
The sheet P is suction-held by the suction force acting inside the suction pad 8.

As described above, when the suction pad 8 sucks the sheet-like material P, the lower chamber 11, the second chamber 10b, and the inside of the piston rod 6 all have a negative pressure, and the force due to the pressure difference from the atmospheric pressure is: The piston 5 rises due to the sum of the elasticity of the springs 12, and during the rise, the piston 5
, The pilot valve 26 is pushed up.

As shown in FIG. 3 (I), the pilot valve 2
When the head 27 of the nozzle 6 is separated from the upper surface of the pilot valve seat 24, the upper opening is opened, and the low positive pressure in the recess 30 flows into the second chamber 10b through the pilot port 28, and the pressure in the second chamber 10b is reduced. Becomes higher than the pressure of the lower chamber 11.

As a result, the piston 5 descends, and the pilot valve 26 also descends by the downward movement. As shown in FIG. 3 (II), the head 27 of the pilot valve 26 is supported on the upper surface of the pilot valve seat 24. And a first chamber 10a and a second chamber 10
The communication of b is cut off.

At this time, the air in the second chamber 10b is sucked into the lower chamber 11 through the piston port 22.
The pressure in the chamber 10b decreases, and the lower chamber 11b, the second chamber 10b, the interior of the piston rod 6, etc. all become negative pressure due to the decrease in the pressure, and the force due to the pressure difference from the atmospheric pressure and the elasticity of the spring 12 cause the pressure to drop. The piston 5 rises again, pushing up the pilot valve 26 as shown in FIG.
Thereafter, the above operation is repeatedly performed. At this time, the flow rate flowing into the second chamber 10b changes depending on the size of the fixed throttle valve 36 provided at the center portion of the vibration adjustment valve 29, so that the amplitude value of the vibration also changes.

For this reason, the piston 5 and the piston rod 6 vibrate in the vertical direction, and when the sucked sheet-like materials P are in a state of being overlapped by several sheets, a separation force acts on the sheet-like materials P due to the above-mentioned vibration. The simple sheet P falls into the magazine 40, and only one sheet P is sucked by the suction pad 8.

The vibration acting on the piston 5 and the piston rod 6 is repeatedly performed while the two-port two-position switching valve 15 is in the air supply state. When the two-port two-position switching valve 15 is switched to the air supply cutoff position, , Air supply chamber 3
Each of the first, second chamber 10b, first chamber 10a and lower chamber 11 is maintained at a negative pressure.

Therefore, the piston 5 has a negative pressure in the lower chamber 11, the second chamber 10b, the inside of the piston rod 6, etc., and rises due to the sum of the force due to the pressure difference from the atmospheric pressure and the elasticity of the spring 12. The pilot valve 26 is pushed up by the piston 5, and the pilot valve 26 and the vibration adjusting valve 29 move upward (for the second stroke (for the remaining stroke)), and each component returns to the origin position shown in FIG. . When the entire vibration suction cylinder is moved in the horizontal direction at the origin position and is moved to a predetermined position, and the three-port two-position switching valve 19 is switched to the open position, the rod that connects the inside of the rod 6 and the lower chamber 11 is communicated. Since the inside of the suction pad 8 is kept at the atmospheric pressure by the port 33, the sheet material P is released from suction and falls downward, and the sheet material P is supplied to a predetermined position.

As shown in FIG. 1, an air supply port 34 communicating with the second chamber 10b is formed in the pilot valve seat 24, and a two-port two-position switching is provided in an air supply passage 38 connected to the air supply port 34. If the valve 35 is connected, the sheet P
Is lifted to a predetermined height, and the entire vibration suction cylinder is moved in the lateral direction.
5 is switched to the air supply position and the second chamber 1
By supplying a low positive pressure to 0b, the sheet-like material P can be lowered together with the piston 5. By opening the three-port two-position switching valve 19 in the lowered state, the sheet-like material P can be released from the suction at the lowered position.

In the embodiment, the vibration adjusting valve 29 having the fixed throttle valve 36 is slidably provided in the upper chamber 10, but the vibration adjusting valve 29 is omitted, and instead,
As shown in FIG. 1, a variable throttle valve 37 may be attached to the air supply pipe 14, and the intensity of vibration may be adjusted by adjusting the throttle of the variable throttle valve 37.

[0034]

As described above, according to the present invention, the vertical vibration is applied to the piston and the piston rod during the upward stroke of the sheet-like object sucked by the suction pad, so that the sheet-like objects overlap. Even if the sheet is taken out in a state, the overlap can be released and only one sheet-like object can be taken out to a predetermined position without fail.

Further, a pilot valve seat and a pilot valve are assembled in the upper chamber of the cylinder, and vertical vibration is applied to the piston by utilizing a pressure difference between the first chamber and the second chamber partitioned by the pilot valve seat. With this configuration, it is possible to provide a low-cost vibration adsorption cylinder that can be easily manufactured with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of a vibration suction cylinder according to the present invention.

FIG. 2 is a vertical cross-sectional front view showing a lowered state of a suction pad on the drawing.

FIGS. 3 (I) and (II) are cross-sectional views showing a stepwise state of vibration applied to the piston according to the first embodiment.

[Explanation of symbols]

 Reference Signs List 1 cylinder 5 piston 6 piston rod 8 suction pad 10 upper chamber 11 lower chamber 12 spring 13 air supply port 16 intake / exhaust port 21 check valve port 23 check valve 24 pilot valve seat 10a first chamber 10b second chamber 26 pilot valve 27 head Part 28 Pilot port 33 Rod port 34 Air supply port 37 External throttle control valve

Claims (1)

[Claims] 1. A piston having a cylindrical piston rod in a cylinder and a spring for pressing the piston upward are incorporated into the cylinder, and the cylinder communicates with an upper part of an upper chamber formed above the piston. A lower end portion of a piston rod positioned below the cylinder through a rod cover provided at a lower portion of the cylinder, provided with an air supply port, and provided with an intake / exhaust port communicating with a lower portion of a lower chamber formed below the piston; A suction pad communicating with the inside of the piston rod is attached to the piston rod, and a check valve port for communicating the inside of the piston rod with the upper chamber and a piston port for communicating the upper chamber with the lower chamber are formed on the piston. A rod port is provided at the upper part of the piston rod for communicating the inside of the rod with the lower chamber, and the pressure in the upper chamber is applied to the check valve port by the piston lock. When the pressure becomes lower than the internal pressure of the valve, in a suction cylinder incorporating a check valve for opening the check valve port, a pilot valve seat for dividing the upper chamber into a first chamber and a second chamber is fixed in the upper chamber. In the upper part of the pilot valve that slidably penetrates the pilot valve seat, a head that is received on the upper surface of the pilot valve seat is provided, and when the head separates from the pilot valve seat above the pilot valve seat, A vibration suction cylinder, wherein a pilot port communicating with the first chamber and the second chamber is formed.