JPH0510994Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is suitable for supplying processing materials to processing machines such as presses, or when taking out secondary processed products processed by the processing machine from the processing machine. The present invention relates to a material feeding device used for, and in particular, to a material feeding device that can reliably perform the sequence of starting the reciprocating movement of a movable clamp part and at least the opening and closing operations of a movable clamp plate.

[Prior art]

Generally, a gripper-type material feeding device is known as one of the material feeding devices that intermittently supplies material to a processing machine such as a press machine. This material feeding device uses pressure fluid as a driving source to repeatedly clamp and unclamp the material, while one member reciprocates over a certain section to feed the material in a certain direction.

Figures 3a and 3b show an example of a gripper type material feeding device. The material feeding device A includes a fixed clamp section 1 which has a plurality of cylinder mechanisms and pressure fluid passages formed therein and is attached to a processing machine, and a guide rod 4 serving as a guide member for the fixed clamp section 1. A stopper member 3 integrally formed with
have.

The movable clamp section 2 is formed integrally with a piston rod of a large cylinder mechanism disposed within the fixed clamp section 1, and is configured to reciprocate in accordance with the movement of the piston rod.

Furthermore, a small cylinder mechanism is disposed within the fixed clamp section 1 to open and close the fixed clamp plate 6 on the upper surface. Similarly, a small cylinder mechanism for opening and closing the movable clamp plate 7 is formed inside the movable clamp section 2.

Note that 5 is a stopper which is slidable relative to the guide rod 4 and is normally fixed at a predetermined position. By adjusting the fixed position of the stopper 5, the amount of movement of the movable clamp section 2, that is, the amount of material fed is regulated.

Further, the fixed clamp part 1 includes an operating solenoid valve 10 that switches and controls the pressure fluid based on a timing signal from a processing machine such as a press machine, and a fixed clamp plate 6 that is opened for a certain period of time to hold the material for a certain period of time. Solenoid valve 1 for releasing to free state
1. A pressure fluid supply port 12 and a pressure fluid discharge port 13 are respectively provided. And movable clamp part 2
The reciprocating operation of the clamp plate 6 and the opening/closing operation of the fixed clamp plate 6 and the movable clamp plate 7 are controlled by switching the pressure fluid using these electromagnetic valves 10 and 11.
Further, a cushion device 14 is disposed below the movable clamp section 2. This cushion device 14
For example, the cylinder mechanism has a cylinder mechanism in which fluid is disposed in a sealed state, and a piston having two piston rods 14a protruding from the cushion device 14 is disposed within the cylinder mechanism, and the two cylinder parts are disposed. is formed. When the movable clamp part 2 reciprocates, one piston rod 1
4a alternately contacts the stopper 5 of the stopper member 3, and the other piston rod 14a contacts the stopper 1a of the fixed clamp part 1, and the movable clamp part is moved within the two cylinder parts while compressing the fluid in the cylinder mechanism. 2 is each stopper 1a,
This is to reduce the impact when it comes into contact with 5.

Further, the material feeding device A is divided into two types depending on the feeding direction. Specifically, there are two types: a push-feed type where the movable clamp part 2 moves from the stopper member 3 side to the fixed clamp part 1 side attached to the processing machine with the material being clamped by the movable clamp plate 7, and a movable clamp plate. There are two main types: the movable clamp part 2 moves from the fixed clamp part 1 side to the stopper member 3 side while the material is clamped by the clamps 7, and returns to the original state with the material released. be done.

When the material feeding device A is a push-feeding type, the internal fluid circuit has a configuration shown in the schematic diagram of FIG. 4.

In FIG. 4, in this case, the fixed clamp plate 6 is open, the movable clamp plate 7 is closed, and the movable clamp part 2 is located on the fixed clamp part 1 side. Then, when the solenoid valve 10 is switched in accordance with the movement of a processing machine such as a press machine, the small cylinder mechanism in the fixed clamp part 1 and the movable clamp part 2
The pressure fluid in the lower part of each small cylinder mechanism is discharged, the fixed clamp plate 6 is closed, and the movable clamp plate 7 is opened. At the same time, the operating valve 15 is switched by the pressure difference, and pressure fluid flows into one side of the large cylinder mechanism via the speed controller 16, and the movable clamp part 2 integrated with the piston rod is moved toward the stopper member 3. Move to.
During this time, the material is processed, and if necessary, the releasing electromagnetic valve 11 is operated to open the fixed clamp plate 6 to temporarily free the material.

On the other hand, when the solenoid valve 10 is switched, the fixed clamp plate 6 opens, the movable clamp plate 7 closes, and the movable clamp part 2 moves from the stopper member 3 side to the fixed clamp part 1 side with the material being clamped. supply materials.

By repeating this operation, material is intermittently supplied to the processing machine.

In addition, the shape of the operating valve and the position of the discharge port connected to the operating valve are slightly different in the pull-feed type material feeder, and the movement of the movable clamp section is simply reversed compared to the push-feed type material feeder. The operating principle is the same.

[Problems to be solved by the invention] By the way, in the conventional material feeding device, the opening/closing operation of the movable clamp plate and the reciprocating motion of the movable clamp part are started at the same time. That is, in the above-mentioned push-feed type material feeding device A, the movable clamp plate 7 opens at the same time as the movable clamp part 2 starts moving from the fixed clamp part 1 side to the stopper member 3 side, and conversely, the movable clamp plate 7 opens from the stopper member 3 side. At the same time as the movable clamp section 2 starts moving toward the clamp section 1 side, the movable clamp plate 7 closes to clamp the material.

The relationship between the reciprocating motion of the movable clamp section 2 and the opening/closing motion of the movable clamp plate 7 at this time is shown in FIG. The vertical axis shows the opening/closing amount of the moving clamp plate 7 and the moving amount of the moving clamp part 2, and the horizontal axis shows the moving time. This figure shows the opening/closing operation of the As can be seen from the graph, the reciprocating movement of the movable clamp part 2 and the opening/closing operation of the movable clamp plate 7 are started at the same time, so while the movable clamp plate 7 moves by the opening/closing amount ₁ in t ₁ hours, the movable clamp part 2 and A region c where the motions interfere is formed.

That is, the movable clamp section 2 moves in a state where the movable clamp plate 7 does not completely clamp the material, so that slippage occurs between the material and the movable clamp plate 7, resulting in a decrease in the feeding accuracy and the formation of slip marks on the surface of the material. Also, after the material is fed, before the movable clamp plate 7 is completely opened,
In order to prepare for the next feeding operation, the movable clamp portion 2 opens and closes the moving clamp portion 2, which pulls back the material, causing slip marks on the surface of the material.

Furthermore, as shown by the broken line a', the speed controller 16 or the like can be used to adjust the flow rate of the pressure fluid flowing into and out of the large cylinder mechanism to suppress the moving speed of the movable clamp section 2. The interference area c with the opening/closing operation of the movable clamp plate 7 is reduced,
Sliding scratches on the material are reduced and feeding accuracy is improved. However, the interference area c will not be completely eliminated, and the moving speed of the movable clamp section 2 will decrease, making it impossible to follow press machines etc. that operate at high speeds, limiting the range of application of the material feeding device, and reducing production. There was a problem of decreased sex.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned problems, and in particular, it is a material feeding method that can reliably perform the sequence of the opening/closing operation of the movable clamp plate and the reciprocating operation of the movable clamp part. The purpose is to provide equipment.
In order to achieve this object, the present invention has a configuration including a fixed clamp part attached to a processing machine such as a press machine, a stopper member located opposite to the fixed clamp part, and a stopper member located opposite to the fixed clamp part. A movable clamp part is formed between the stopper members so as to be able to reciprocate while being guided by a guide member, and by switching the fluid passage for the pressure fluid formed in the fixed clamp part or the movable clamp part, While reciprocating the movable clamp section, the movable clamp plate disposed on the fixed clamp section is alternately opened and closed in accordance with the movement of the movable clamp section to supply material to the processing machine or to remove the workpiece from the processing machine. In the material feeding device for taking out the material, the movable clamp section has a piston rod that protrudes toward the fixed clamp section and the stopper member, and a switching valve that switches the fluid passage of the pressure fluid by the movement of the piston rod is integrally disposed. When the movable clamp part reciprocates, the piston rod comes into contact with the fixed clamp part or the stopper member to switch the switching valve, and at least the movable clamp plate of the fixed clamp plate and the movable clamp plate is opened and closed. This is to switch and control the pressure fluid used.

[Effect]

The movable clamp part moves with the material being clamped by the movable clamp plate, and the piston rod of the switching valve, which is disposed in a casing integrally formed with the movable clamp part, hits the fixed clamp part or the stopper member. Upon contact, the switching valve switches and the movable clamp plate opens. Next, with the movable clamp plate open, the movable clamp part starts moving in the opposite direction in preparation for the next feeding operation.
Before the movable clamp section starts moving, the opening/closing position of the movable clamp plate is in advance the position when the movable clamp section is moving.

〔Example〕

The material feeding device of the present invention will be described in detail below with reference to the drawings.

FIG. 1a is a partially cutaway side view showing an embodiment of the material feeding device of the present invention, and FIG. 1b is a sectional view showing a cushion device of the material feeding device of the present invention. The basic configuration is shown in Figure 3a,
Since it is almost the same as the conventional material feeding device shown in FIG.

In the figure, reference numeral 1 denotes a fixed clamp part, which has a fluid passage for pressurized fluid such as compressed air inside, and has a small cylinder mechanism for opening and closing the fixed clamp plate 6 and a large cylinder mechanism for reciprocating the movable clamp part 2. are doing. Further, a stopper member 3 is disposed at a position facing the fixed clamp part 1 via a guide rod 4. Furthermore, the movable clamp section 2 reciprocates between the fixed clamp section 1 and the stopper member 3 while being guided by a guide rod 4. Furthermore, a small cylinder mechanism is formed in the movable clamp section 2, and the movable clamp plate 7 repeatedly opens and closes in accordance with the reciprocating movement of the movable clamp section 2.

A cushion device 20 is disposed at the bottom of the movable clamp section 2. This cushion device 2
0, the piston rods 22a and 22b of the piston 22 disposed inside are respectively connected to the stopper 1a of the fixed clamp part 1 and the stopper 5 of the stopper member 3.
It absorbs the impact when it comes into contact with the Further, the cushion device 20 is configured to also serve as a pressure fluid switching valve communicating with a small cylinder mechanism for opening and closing the fixed clamp plate 6 and the movable clamp plate 7.

Next, the cushion device 20 will be explained in detail. As shown in FIG. 1b, the cushion device 20 includes a casing 21 having a cylinder portion formed therein and attached to the lower part of the movable clamp portion 2;
It is composed of a piston 22 having a series of piston parts 22c and 22d. and casing 2
1, there are small through holes 21a and 21b at both ends in the forming direction of the cylinder part that communicate from the cylinder part to the outside.
is formed. Furthermore, in the casing 21,
Three fluid passages 24a, 24b, 24c are formed, and each fluid passage 24a, 24b, 24c is connected to a fluid passage in the movable clamp part 2 via the contact surface of the casing 21 and the movable clamp part 2. It is. The piston 22 has a series of two piston portions 22c and 22d having piston rods 22a and 22b at both ends. A gasket 23 is provided on the piston portions 22c and 22d.

Furthermore, the operation of the cushion device 20 will be explained. When the cushion device 20 reciprocates together with the movable clamp section 2, the piston rods 22a, 2
2b abut against stoppers 1a and 5, respectively. At this time, for example, if the piston rod 22a is
When it comes into contact with a, the entire piston 22 moves relatively toward the stopper member 3, and the air is compressed in the cylinder part formed by the piston part 22d and the casing 21, increasing the pressure. The pressure decreases in the cylinder section, and the through hole 21a formed in the casing 21
While the compressed air flows into the cylinder portion from the piston portions 22c and 2 and is released from the through hole 21b, the piston portions 22c and 2
Due to the pressure difference generated between the pistons 2d and 2d, the piston 22 receives a force in the direction of the stopper 1a and absorbs the impact upon contact. Conversely, the piston rod 22b is the stopper 5.
The cushion device 20 is configured to act in the same manner when it comes into contact with the object, absorbing the impact of the contact.

Further, the cushion device 20 acts as a pressure fluid switching valve, and the piston rod 22a is connected to the stopper 1.
a, that is, when the movable clamp part 2 is located on the fixed clamp part 1 side, the fluid passage 24a among the fluid passages formed in the casing ring 21
and the fluid passage 24b are connected. Then, in this connected state, when the movable clamp part 2 moves toward the stopper member 3 and the piston rod 22b comes into contact with the stopper 5, the connection of the fluid passages is switched, the fluid passages 24b and 24c are connected, and the piston rod 22a Continue connecting the piston rods 22a and 22 until they come into contact with the stopper 1a.
Each time b comes into contact with the stoppers 1a and 5, the connections of the fluid passages 24a, 24b, and 24c are alternately switched.

Next, the operation of the material feeding device of the present invention will be explained. FIG. 2 is a fluid circuit diagram showing an embodiment of the material feeding device of the present invention. In this case, an example of a push-feed type is shown in which the material is supplied from the stopper member 3 side toward the fixed clamp part 1. Second
In the figure, the movable clamp part 2 is located on the fixed clamp part 1 side, the fixed clamp plate 6 is in a closed state, and the movable clamp plate 7 is in an open state.
When the solenoid valve 10 is switched in accordance with the processing timing of a processing machine such as a press machine, the fixed clamp plate 6 remains closed, the movable clamp plate 7 remains open, and the movable clamp portion 2 moves in the direction of the stopper member 3. When the piston rod 22b of the cushioning device 20 comes into contact with the stopper 5 of the stopper member 3, the piston 22 in the cushioning device 20 moves, and the connection between the fluid passage 24a and the fluid passage 24b is changed to the fluid passage 24b. and the fluid passage 24c are connected, the pressure fluid inside the small cylinder mechanism is discharged from the discharge port 13, the fixed clamp plate 6 is opened by the spring, and the movable clamp plate 7 is closed. Next, when the solenoid valve 10 is switched, the fixed clamp plate 6 is in the open state, the movable clamp plate 7 is in the closed state, and the movable clamp 2
The part moves in the direction of the fixed clamp part 1 and feeds the material to the processing machine. When the piston rod 22a of the cushion device 20 comes into contact with the stopper 1a of the fixed clamp portion 1, the piston 22 in the cushion device 20 moves in the opposite direction, and the fluid passage 24a
and the fluid passage 24b are connected, the fixed clamp plate 6 is closed, and the movable clamp plate 7 is opened.
Also, depending on the type of machining, etc., the solenoid valve 1 may be used during machining.
1 to temporarily open the fixed clamp plate 6 and release the material.

As mentioned above, the material feeding device shown in the example is as follows:
At the same time as the movement of the movable clamp part 2 is completed, the fixed clamp plate 6 and the movable clamp plate 7 are opened and closed, and when the movable clamp part 2 starts moving next, the fixed clamp plate 6 and the movable clamp plate 7 are opened and closed. The opening/closing operation of the movable clamp plate 7 has already been completed, and in particular, the movable clamp part 2 starts moving after the movable clamp plate 7 is completely opened or in a completely closed state. Therefore, the sequence of the reciprocating movement of the movable clamp section 2 and the opening/closing operation of the movable clamp plate 7 can be ensured, and there will be no slipping on the material surface, pulling the material back, or any damage between the material and the movable clamp plate 7. There is no possibility of slippage and deterioration of feeding accuracy. Furthermore, in conventional material feeding devices, a single operating solenoid valve 10 controls both the large cylinder mechanism and the small cylinder mechanism, so the flow rate of the pressure fluid to be controlled is large, and the solenoid valve 10 itself is large. However, there was a problem that the response speed of the solenoid valve 10 was slow. However, the material feeding device shown in the embodiment is configured to control the pressure fluid supplied to the small cylinder mechanism by a cushion device 20 of an extremely simple configuration disposed in the movable clamp section 2. Therefore, only the large cylinder mechanism is controlled by the solenoid valve 10, and the flow rate of the pressure fluid to be controlled is reduced, which not only makes the solenoid valve 10 more compact, but also increases the feed rate.
Further, the cushion device 20 includes a movable clamp portion 2
According to the reciprocating movement of the piston rods 22a, 2
2b abut against stoppers 1a and 5, respectively, and their pistons 22 are forcibly moved to switch the fluid passages. Therefore, the pressure fluid can be controlled reliably, and even high-speed feeding can be sufficiently followed.

[Other Examples]

In the above embodiments, an example of a push type material feeding device was shown, but in the case of a pulling type material feeding device, the fluid passage 24a of the cushion device 20 is connected to the discharge port 13, and the fluid path 24c is connected to the pressure It may be configured to be connected to the fluid supply port 12. When switching the connection, different fluid passages may be formed in advance in the movable clamp section 2 or within the cushion device 20 depending on the feeding method, or the movable clamp section 2 and the cushion device 20 may be
A block with a predetermined fluid passage formed therebetween may be interposed, and by replacing this block, a fluid passage corresponding to each feeding method can be formed.

In addition, in the above embodiment, an example was shown in which a switching valve was formed within the cushion device, but of course, the switching valve may be built into the movable clamp section separately from the cushion device, or the switching valve may be formed by a separate member. The valve may be formed integrally with the moving clamp part.

Further, in the above embodiment, an example was shown in which the switching valve controls not only the opening and closing of the movable clamp plate but also the opening and closing of the fixed clamp plate, but the switching valve may be configured to control only the opening and closing of the movable clamp plate. .

〔effect〕

As described above, in the material feeding device of the present invention, there is a fixed clamp part attached to a processing machine such as a press machine, a stopper member located opposite to the fixed clamp part, and a space between the fixed clamp part and the stopper member. The movable clamp part has a movable clamp part formed to be able to reciprocate while being guided by a guide member, and the movable clamp part can be moved by switching the fluid passage for the pressure fluid formed in the fixed clamp part or the movable clamp part. While moving back and forth,
In a material feeding device that feeds material to a processing machine or takes out a workpiece from a processing machine while alternately opening and closing in accordance with the operation of the fixed clamp section, the movable clamp section has a direction in the direction of the fixed clamp section and the stopper member. A switching valve is integrally provided, and when the movable clamp section reciprocates, the piston rod protrudes from the fixed clamp section or the fixed clamp section. The switching valve switches when it comes into contact with the stopper member, and switches and controls the pressure fluid that opens and closes at least the movable clamp plate of the fixed clamp plate and the movable clamp plate.

Therefore, at the same time as the movement of the movable clamp section is completed, the switching valve is switched, and the movable clamp plate is opened and closed. Therefore, when the movable clamp part moves with the movable clamp plate closed to supply material, the movable clamp plate opens at the same time as the movement ends, and the movable clamp part moves in the opposite direction for the next supply. When moving, the movable clamp plate moves in a completely open state, and the movable clamp plate closes at the same time as the movement ends. Therefore, the sequence of the reciprocating movement of the movable clamp part and the opening/closing movement of the movable clamp plate can be ensured, preventing slippage on the material, pulling the material back when the movable clamp part returns for the next feed, or When feeding the material between the material and the movable clamp plate, slippage does not occur and the feeding accuracy is not reduced.

Furthermore, the movable clamp section has a mechanically operated switching valve, and the switching valve controls at least the opening and closing of the movable clamp plate. Therefore, other switching valves that control the reciprocating motion of the movable clamp part can be used that control a small flow rate, are small, and have a fast response speed, so that the material can be fed at a higher speed as a whole.

[Brief explanation of drawings]

FIGS. 1a and 1b are a partially cutaway side view and an enlarged sectional view of essential parts of an embodiment of the material feeding device of the present invention, and FIG. Showing the fluid circuit diagram of the material feeding device, Part 3
Figures a and b are a plan view and a side view showing a conventional material feeding device, Fig. 4 is a fluid circuit diagram of the conventional material feeding device, and Fig. 5 is an operational relationship of the conventional material feeding device. This is a graph showing. DESCRIPTION OF SYMBOLS 1... Fixed clamp part, 1a, 5... Stopper, 2... Movable clamp part, 3... Stopper member, 4... Guide rod (guide member), 6...
Fixed clamp plate, 7...Movable clamp plate, 20...
...Cushion device as a switching valve, 22...Piston, 22a, 22b...Piston rod.

Claims (1)

[Claims for Utility Model Registration] (1) A fixed clamp part attached to a processing machine such as a press machine, a stopper member located opposite to the fixed clamp part, and a guide between the fixed clamp part and the stopper member. It has a movable clamp part formed to be able to reciprocate while being guided by a member, and the movable clamp part can be reciprocated by switching the fluid passage for pressure fluid formed in the fixed clamp part or the movable clamp part. While moving, the material is supplied to the processing machine while alternately opening and closing a fixed clamp plate disposed in the fixed clamp part and a movable clamp plate disposed in the movable clamp part in accordance with the movement of the movable clamp part. In a material feeding device that takes out a workpiece from a processing machine, the movable clamp section has a piston rod that protrudes toward the fixed clamp section and the stopper member, and the movement of the piston rod opens a fluid passage for pressurized fluid. A switching valve for switching between the fixed clamp plate and the movable clamp plate is integrally provided, and when the movable clamp part reciprocates, the piston rod contacts the fixed clamp part or the stopper member, and the switching valve switches between the fixed clamp plate and the movable clamp plate. A material feeding device that switches and controls at least a pressure fluid that opens and closes a movable clamp plate. (2) The movable clamp section is provided with a cushion device that alternately contacts the fixed clamp section on one side and the stopper member on the other side to absorb shock when the movable clamp section reciprocates, and the cushion device The material according to Claim 1 of the Utility Model Registration Claim, characterized in that the valve also serves as the switching valve, and the fluid passage of the pressure fluid is switched when the cushion device comes into contact with the fixed clamp part and the stopper member. Feeding device.