JP2548105Y2 - Material feeder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material feeding device for holding and releasing a work material by repeatedly reciprocating at a predetermined timing by a driving cylinder and a clamp operated by a pressurized fluid and conveying the work material. It is.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional material feeder 1 (hereinafter abbreviated as a feeder 1) operated by compressed air (hereinafter abbreviated as air) as a pressurized fluid. The feed device 1 is for intermittently conveying a belt-shaped material 10 to a processing machine. The main body 2 of the feeding device 1 includes a material 1
Fixed clamp part 3 for selectively holding the material during machining 0
Is provided.

A guide holder 5 is connected to the main body 2 via a pair of guide rods 4, 4 parallel to the direction in which the material 10 is conveyed. The guide holder 5 is a plate-like member whose longitudinal direction is a direction orthogonal to the transport direction of the material 10. At both ends of the guide holder 5, guide rollers 6 for guiding the upper and lower surfaces of the material 10 are attached. Also,
A pair of guide rollers 7 for guiding both ends of the material 10 are provided on the upper surface of the guide holder 5.

The guide rod 4 is provided with a movable clamp portion 8, which is reciprocally movable between the main body 2 and the guide holder 5. The moving clamp unit 8 moves while selectively holding the material 10, and moves the material 10 in accordance with the processing operation of the processing machine.
Is transported intermittently in a predetermined direction. These operations of the apparatus are provided by air supplied into the main body 2.

[0005] The feeder has an air circuit as shown in Figs. In this air circuit, a fixed clamp part 3 for holding and releasing the material 10 and a material for holding and releasing the material 10 are provided.
A moving clamp unit 8 to be opened and a drive cylinder 9 for reciprocating the moving clamp unit 8 are included. The fixed clamp 3 is operated by a double-acting cylinder. The moving clamp unit 8 is operated by a single-acting cylinder having a return means such as a spring. The drive cylinder 9 has a piston 11 that reciprocates in a barrel, and a rod 12 provided on one end surface of the piston 11 and protruding out from one end of the barrel. 8 is linked and connected. In the figure, reference numeral 20 denotes an operation valve for controlling the drive cylinder 9, and the inside of a cylindrical valve body 21 is provided with a valve body 22a.
Or 22b reciprocates. The valve body 21 of the present embodiment is formed by directly drilling a hole in the main body 2 of the feeder 1, and a cylindrical main body formed of a separate member is incorporated in the main body 2 of the feeder 1. is not.

A supply unit (not shown) for supplying air to the air circuit is connected to the drive cylinder 9 via an air supply path 23.
Is connected to one end 9a of the barrel. Further, the air supply path 23 is provided at one end 20a of the main body of the operation valve 20 with a first
Are connected through a passage P. Further, the air supply path 23 is connected to one end of a double-acting cylinder of the fixed clamp unit 3. Air is constantly supplied to one end 9 a of the barrel of the drive cylinder 9, the first passage P of the main body of the operation valve 20, and one end of the double-acting cylinder of the fixed clamp 3.

A supply unit (not shown) for supplying air to the air circuit is connected to a control valve 30 serving as a control means by an air supply path 23.
Connected through. As shown in each figure, the control valve 30 may be a pilot valve 30a or a solenoid valve 30.
b may be used. The outlet side of the control valve 30 is connected to the other end of the double-acting cylinder of the fixed clamp portion 3 and the single-acting cylinder of the movable clamp portion 8, respectively. The second passage P2 is provided in the portion 20b.
Connected through.

The fixed clamp portion 3 is configured to release the material when air is supplied from the control valve 30 and to hold the material when the supply of air is shut off. The moving clamp unit 8 is configured to hold the material when air is supplied from the control valve 30 and to release the material when the supply of air is shut off.

As described above, the first and second passages P and P1 are formed in the valve body 21 of the operating valve 20 at both ends 20.
a, 20b. In addition, the valve body 21 includes
A pressure release passage R for discharging air out of the circuit is formed. The valve body 21 has a third passage A that guides the air supplied from the first passage P into the body to the other end 9 b of the drive cylinder 9. In the figure, reference numeral 24 denotes a speed controller.

In the feeder 1 having the above-described basic configuration, two types of feeders having different material feed modes are properly used depending on the application. First, it is a push-feed type that is installed on the material supply side of a processing machine and feeds the material clamped by the moving clamp unit to the processing machine. The other is a tension type that is set on the processed material delivery side of the processing machine and pulls out the processed material held by the moving clamp unit from the processing machine.

Conventionally, in the feeder 1 having a common basic structure, the air switching structure is changed by exchanging both the bush 40 and the valve body 22 inside the operation valve 20, and the reverse is applied. Two types of feeders that work were configured.

First, in the case of a push-feed type feeder, a bush 40a and a valve body 22a having a structure as shown in FIG. 5 (a) are mounted inside the valve body 21, and shown in FIG. 5 (b). A circuit as such an operation valve was configured. With the operation valve of such a circuit, the operation as shown in FIG. 3 can be obtained. That is, as shown in FIG. 3A, when the operation signal is not input and the air is supplied to the other end 20b of the operation valve 20, the valve body 22a of the operation valve 20 moves toward the one end 20a. Therefore, the third passage A and the pressure release passage R communicate with each other. Since the third passage A communicates with the other end 9b of the drive cylinder 9, the air in the other end 9b of the drive cylinder 9 is discharged outside through the passage A, the working cylinder 20, and the pressure release passage R. Will be done. At this time, the fixed clamp 3 is in the open state, and the movable clamp 8 holds the material. Then, the piston 11 of the drive cylinder 9 moves to the other end 9b side, and the moving clamp section 8 moves to the main body 2 side while sandwiching the material, and performs the pushing and feeding operation.

As shown in FIG. 3B, when a control signal is input to the control valve 30, the movable clamp unit 8 and the fixed clamp unit 3
Then, air is not supplied to the operation valve 20. Operating valve 20
Of the third passage A moves to the other end 20b side.
And the first passage P communicate with each other. The air supplied from the first passage P is supplied to the other end 9 of the drive cylinder 9 through the passage A.
b. The piston 11 of the drive cylinder 9, which is a double-acting cylinder, moves toward the one end 9a where the rod 12 is provided. At this time, the fixed clamp unit 3 is closed, and the movable clamp unit 8 is open. And the moving clamp unit 8
Retreats open.

In the case of a pulling feed type feeder, a bush 40b and a valve body 22b having a structure as shown in FIG. 6A are mounted inside the valve main body 21 and shown in FIG. 6B. A circuit as such an operation valve was configured. With an operation valve having such a circuit, an operation as shown in FIG. 4 can be obtained. That is, as shown in FIG. 4A, when the operation signal is not input and air is supplied to the other end 20b of the operation valve 20, the valve body 22b of the operation valve 20 moves toward the one end 20a. Therefore, the pressure release passage R is closed, and the third passage A and the first passage P communicate with each other. Since the third passage A communicates with the other end 9 b of the drive cylinder 9, air is supplied into the other end 9 b of the drive cylinder 9. At this time, the fixed clamp 3 is in the open state, and the movable clamp 8 holds the material. Then, the piston 11 of the drive cylinder 9, which is a double-acting cylinder, moves to the one end 9a side, and the moving clamp section 8 moves to the side away from the main body 2 while sandwiching the material, thereby performing a pulling operation.

As shown in FIG. 4B, when a control signal is input to the control valve 30, the movable clamp unit 8 and the fixed clamp unit 3
Then, air is not supplied to the operation valve 20. Operating valve 20
Move to the other end 22b side, and the third passage A
And the pressure release passage R communicate with each other. The air in the other end 9b of the drive cylinder 9 passes through the passage A, the operating valve 20, and the pressure release passage R.
Is released to the outside via At this time, the fixed clamp unit 3 is in the closed state, and the movable clamp unit 8 is open. Then, the piston 11 of the drive cylinder 9 moves to the other end 9b side, and the moving clamp section 8 performs an operation of returning to the main body side to clamp the material.

[0016]

Consider the case where air is supplied from the supply unit to the air circuit system in the above-described conventional feeder. Although the air is supplied to both ends of the operation valve 20, the supply to the other end 20b is performed via the control valve 30, so that the time is delayed as compared with the supply to the one end 20a. Therefore, the valve body 22a moves to the other end 20b side where the rise in pressure is delayed, and the first passage P and the third passage A communicate with each other. Therefore, air is supplied to the other end 9b of the drive cylinder 9 via the third passage A, and as a result, the piston of the drive cylinder 9 moves to the one end 9a.

When the material is replaced, the processing machine is stopped and the material is positioned with respect to a processing part such as a mold.
However, when the processing is started, the driving cylinder is unnecessarily operated and the movable clamp portion is moved as described above, so that there has been a problem that the position of the material accurately adjusted is shifted.

An object of the present invention is to prevent a moving clamp portion from moving unnecessarily when air is supplied in a material feeding device.

[0019]

According to a first aspect of the present invention, there is provided a material feeding device, comprising: a fixed clamp portion for selectively holding and releasing a workpiece; and a workpiece reciprocally movable with respect to the fixed clamp portion. , A supply unit for supplying a pressure fluid for driving the fixed clamp unit and the movement clamp unit, and a pressure fluid from the supply unit is always supplied to one end thereof. A drive cylinder having a piston for moving the moving clamp unit, a control unit for supplying or blocking the pressurized fluid supplied from the supply unit to the fixed clamp unit and the moving clamp unit, and reciprocating inside the valve body. A valve body is movably housed, a first passage P for constantly supplying pressure fluid from the supply unit is connected to one end of the valve body, and the control unit is connected to the other end of the valve body. From A second passage P1 for supplying a force fluid is connected, and the pressure fluid supplied from the first passage P is supplied to the valve body when the pressure fluid from the second passage P1 is shut off. A third passage A leading to the other end of the valve, the valve body having an operating valve formed with a pressure release passage R for releasing the pressure of the pressurized fluid. The body is the second
A resistance means for applying a resistance in the opposite direction to the valve body when moving in the direction of the passage.

According to a second aspect of the present invention, there is provided a material feeding apparatus, wherein the resistance means of the material feeding apparatus according to the first aspect is configured such that the resistance means comprises
And a resilient member that presses the valve body toward the first passage with a force smaller than the force that the pressure fluid supplied from the passage presses the valve body of the operation valve toward the second passage. It is characterized by the following.

[0021]

In the case of pushing and feeding, a pressurized fluid is injected into the feeding device. A pressure fluid is directly supplied from the first passage P to one end of the operating valve. A pressure fluid is supplied to the other end of the operating valve from the second passage P1 via the control unit. Since the pressure fluid passes through the control valve, the pressure fluid reaches the other end of the operating valve later in time than the pressure fluid reaches the one end. Therefore, immediately after the supply of the pressure fluid, the valve body of the operating valve tends to move toward the second passage P1. However, since the valve body is provided with a resistance force in the opposite direction by the resistance means, it does not move rapidly in the direction of the second passage P1, but takes a time lag until the pressure fluid reaches the other end. Can be. Therefore, there is no possibility that the first passage and the third passage communicate with each other in the operation valve, and the pressurized fluid flows into the drive cylinder, whereby the drive cylinder is unnecessarily operated.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment to be described below relates to a push-feed device having a basic structure as described above, and particularly to a resistance means provided between a valve body of an operating valve and a second passage side of a valve body. To prevent the valve body from moving to the second passage side due to the air being supplied to the first passage side first. In the following description, for portions having the same configuration as the conventional example, reference numerals in the description of the conventional example are referred to for simplification of the description, and the description is omitted.

A first embodiment of the present invention will be described with reference to FIG. The operating valve 50 of the present embodiment shown in FIG.
The configurations of the valve body 22a and the bush 40a are the same as those of the conventional operation valve 20 shown in FIG.

A compression coil spring 60 as a resistance means is interposed between the large diameter portion of the valve body 22a and the other end 50b of the operation valve 50. A locking portion (not shown) is provided on the other end 50b side of the valve body 21 where the second passage P1 is open, and locks one end of the compression coil spring 60. The other end of the compression coil spring 60 is engaged with a disk-shaped projection 71 provided on the large-diameter portion 70 of the valve body 22a.

The compression coil spring 60 applies a resisting force in the opposite direction to the valve body 22a of the operating valve 50 when the valve body 22a moves in the direction of the second passage P1. The resistance is smaller than the force of the air supplied from the first passage P pressing the valve body 22a of the operating valve 50 toward the second passage P1.

Operating valve 5 provided with compression coil spring 60
FIG. 1A shows a pneumatic circuit diagram of a zero. Since the configuration of the pneumatic circuit other than the operation valve 50 in the present feeder is the same as the conventional one, those parts are shown in FIG.
With reference to (b), the operation of the push-feed type feeding device in the present embodiment will be described with reference to FIG.

Air is supplied from the supply unit to the air circuit system. Air is supplied to both ends of the operating valve 50,
Since the supply to the other end 50b side is performed via the control valve 30, the time is delayed as compared with the supply to the one end 50a side. Therefore, the force applied to the small diameter portion 72 of the valve body 22a is
There is a slight time delay before the force applied to zero becomes smaller.

Therefore, without the compression coil spring 60, the valve body 22a moves to the other end 50b, where the rise in pressure is delayed. Then, the small diameter portion 72 of the valve body 22a is separated from the seal portion of the bush 40a, and the first passage P and the third passage A communicate with each other. Therefore, air is supplied to the other end 9b of the drive cylinder 9 via the third passage A, and as a result, the piston of the drive cylinder 9 moves to the one end 9a.

However, in this embodiment, the compression coil spring 6 is disposed between the valve body 22a and the other end 50b of the operation valve 50.
0, resistance is applied when the valve body 22a moves to the other end 50b side. Therefore, even when the pressure on the one end 50a side increases first when air is supplied to both ends of the operation valve 50,
The valve body 22a does not move to the other end portion 50b side at a stroke, and a time difference until the air is supplied to the other end portion 50b side can be increased. That is, the other end 50b of the operation valve 50
Until the pressure on the side rises, the actuating valve 50 does not switch the air flow path, so there is no danger of the drive cylinder 9 operating unnecessarily.

When air is supplied from the control valve 30 to the other end 50b of the operating valve 50, the large diameter portion 70 of the valve body 22a is closed.
Locks on the stepped portion 73 of the bush 40a, and the small diameter portion 72 seals the seal portion. The first passage P and the second passage P1 are each closed. The third passage A and the pressure release passage R communicate with each other.

The other end 9b side of the drive cylinder 9 is opened to the atmospheric pressure through the third passage A, the operating valve 50, and the pressure release passage R. Since air is constantly supplied to one end of the drive cylinder 9, the piston 11 of the drive cylinder 9 moves to the other end 9b. At this time, the fixed clamp unit 3 supplied with air from the control valve 30 opens the workpiece, and the movable clamp unit 8 holds the workpiece. Accordingly, the moving clamp section 8 performs a pushing and feeding operation while holding the workpiece.

When the air from the control valve 30 is shut off, the compression coil spring 60 of the valve body 22 of the operation valve 50 is contracted and moved to the other end 50b. The small diameter portion 72 of the valve body 22a is separated from the bush 40a, and the first passage P and the third passage A communicate with each other, and these passages are sealed from the pressure release passage R and the second passage P1. The air supplied to the operation valve 50 via the first passage P is supplied to the other end 9 b of the drive cylinder 9 via the third passage A. Drive cylinder 9
Of the piston 11 moves toward the one end 9a. At this time, the fixed clamp unit 3 holds the workpiece and the movable clamp unit 8
Is open to the workpiece. Therefore, the moving clamp unit 8
Releases the workpiece and returns to the original position.

In the embodiment described above, the valve main body of the operating valve and the main body of the feeder are described as being integrated.
That is, the valve body of the operating valve was formed by drilling the inside of the body of the feeder. However, the main body of the feeder and the valve main body of the operating valve may be separately configured, and the main body of the operating valve, which is a separate component, may be provided in the main body of the feeder.

[0034]

The material feeder according to the present invention is a feeder for feeding a material by driving a moving clamp part and a fixed clamp part by operating a pressure fluid using a control valve and an operating valve. Is provided with a resistance means to apply a resistance force in a predetermined direction to the valve body. Therefore, when the pressurized fluid is supplied to the device, there is a time difference in the air supplied from the two systems to the operating valve, so that the valve body of the operating valve is prevented from moving in the direction opposite to the desired direction. Unnecessary movement of the moving clamp unit is prevented.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of an operating valve in one embodiment of a push-feed type, and FIG. 1B is an air circuit diagram of the operating valve.

FIG. 2A is a plan view of a conventional feeder, and FIG. 2B is a side view of the same.

FIG. 3A is an air circuit diagram showing a state in which an operation signal is not input in a pneumatic circuit diagram of a conventional push-feed type feeding device, and FIG. 3B is an air circuit diagram showing a state in which an operation signal is input. It is a circuit diagram.

FIG. 4 (a) is an air circuit diagram showing a state where no operation signal is input in the pneumatic circuit diagram of the conventional pulling type feeder, and FIG. 4 (b) is an air circuit diagram showing a state where the operation signal is input similarly. FIG.

FIG. 5A is a cross-sectional view of an operating valve in a conventional push-feed type feeding device, and FIG. 5B is an air circuit diagram thereof.

FIG. 6A is a cross-sectional view of an operation valve in a conventional tension type feeder, and FIG. 6B is an air circuit diagram thereof.

[Explanation of symbols]

 Reference Signs List 3 fixed clamp portion 8 movable clamp portion 9 drive cylinder 10 material as workpiece 21 valve body 22a valve body 30 control valve as control portion 50 operating valve 60 compression coil spring as resistance means P first passage P1 second Path A third path R pressure release path

Claims (2)

(57) [Scope of request for utility model registration] A fixed clamp portion for selectively clamping and releasing the workpiece; a movable clamp portion for selectively clamping and releasing the workpiece while being reciprocally movable with respect to the fixed clamp portion; A supply unit for supplying a pressure fluid for driving the clamp unit and the moving clamp unit, and a driving cylinder including a piston for moving the moving clamp unit while the pressure fluid from the supply unit is always supplied to one end thereof. A control unit that supplies or shuts off the pressurized fluid supplied from the supply unit to the fixed clamp unit and the movable clamp unit, and a valve body is housed in a reciprocating manner inside the valve body; A first passage P for constantly supplying a pressure fluid from the supply unit is connected to one end, and a second passage P1 for supplying a pressure fluid from the control unit is connected to the other end of the valve body. The valve The main body is connected to a third passage A that guides the pressure fluid supplied from the first passage P to the other end of the drive cylinder when the pressure fluid from the second passage P1 is shut off. An operating valve having a pressure release passage R formed in the valve body to release the pressure of the pressurized fluid, wherein the valve body of the operating valve moves in the direction of the second passage. A material feeding device comprising a resistance means for applying a resistance force in an opposite direction to a body. 2. The valve according to claim 1, wherein the pressure fluid supplied from the first passage pushes the valve body of the operating valve toward the first passage with a force smaller than a force that presses the valve body toward the second passage. 2. The material feeding device according to claim 1, wherein said resistance means is constituted by an elastic member which presses and presses.