JPH0444281Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an adsorption device, and can be used for an adsorption device placed in a blank chute that supplies blanks to a press device.

[Background technology and its problems]

Conventionally, along with the automation of press forming operations using transfer press equipment, automatic blank supply equipment has been installed to automatically supply blanks, and the operation of supplying blanks, which are raw materials, has been automated as a series of processes. ing.

Generally, such blank automatic feeding equipment is
Blanks that have been punched out and loaded in advance are transported from the loading position to the top of the processing stage of the transfer press device and placed in a position where they can be held by the feed bar. A ute is provided, and a plurality of blank gripping members are provided above it, and the blanks are lifted up by the blank gripping members that advance and retreat in the conveying direction in synchronization with the feed bar, and are sequentially conveyed to a conveyance stage arranged at equal intervals on the top surface of the blank chute. Then, it is delivered to the feed bar of the transfer press equipment.

By the way, the blank placed on the top surface of the blank chute is likely to move due to vibrations, etc., and may be misaligned with respect to its original position. For this reason, a suction device is provided on each conveyance stage on the upper surface, and a blank, which is an object to be suctioned, is suctioned and held at a placed position.

At this time, it is necessary to release the suction force of the suction device appropriately so as not to interfere with the blank lifting operation by the blank gripping member. control was in place.

However, when controlling the adsorption force of the adsorber intermittently,
In addition to complicating the device and complicating timing adjustments, there are also problems in which the timing is off and the blank's suction force is temporarily lost when it should be held, causing a positional shift, or the suction force is insufficient to hold the blank. There was a problem in that normal operation was difficult, such as creating resistance to lifting and interfering with the conveyance of the blank.

[Purpose of invention]

An object of the present invention is to provide an adsorber that can be simplified in structure, can reliably adsorb an object to be adsorbed, and can automatically release the adsorption force when removing an object.

[Means and actions for solving problems]

The present invention is a suction system in which a suction means that suctions an object to be suctioned with a predetermined suction force is supported movably in the suction force direction by a main body, and the suction force is released when the suction means is moved by a predetermined amount or more. By providing the release means, when releasing the attracted object, the attraction means is moved together with the driven object, and the attraction force of the attraction means is adjusted by the attraction release means according to the amount of movement of the attraction means. be automatically released. In addition, a biasing means is provided to urge the suction means in the direction of the suction force with a force weaker than the suction force, and the suction release means is prohibited from releasing the suction force except during the above-mentioned detachment, so that the suction means is constantly adsorbed. The aim is to eliminate, as much as possible, the time margin in which the object to be attracted may be misaligned, and to realize a reliable suction operation.

〔Example〕

Hereinafter, a first embodiment of the present invention will be described based on the drawings.

In FIG. 1, a transfer press device 1
The machine is equipped with a slide 2, a bolster 3, and a feed bar 4 to perform transfer press processing, and an automatic blank supply device 10 for automatically supplying blanks is provided on the first processing stage side.

The automatic blank feeding device 10 is configured around a drive mechanism 11 attached to a column 6 via an outer wall 5, and includes a transport mechanism 20 that reciprocates along the lower surface of the drive mechanism 11, and a transport mechanism 20 that A blank chute 30 is extended toward the feed bar 4, and the blank 7 is extracted from the lower disk stack device 13 by a blank extraction member 12 provided on the lower surface of the drive mechanism 11 so as to be able to move up and down. At the same time, the blank 7 is suspended at the P ₀ position, and the blank 7 is sequentially sent to the transport stages P ₁ , P ₂ , P ₃ , and P ₄ positions on the blank chute 30 by the transport mechanism 20, and the blank 7 is suspended in the transfer press device 1. can be supplied automatically.

The transport mechanism 20 includes a first gripping member 2 for transporting the blank 7 suspended at the P ₀ position to the P ₁ position.
1, and second to fourth gripping members 22, 23, 24 for feeding the blanks 7 placed at positions _P1 , _P2 , _P3 to positions _P2 , _P3 , _P4, respectively. ,
The sequential feeding operation is realized.

Here, the first gripping member 21 is connected to the drive mechanism 11.
It is fixed to a movable member 20A that is guided by a guide rail 11A fixed to the lower surface of the board and reciprocated horizontally, and a pair of jaws 21A facing vertically in the drawing move the blank extraction member to the position indicated by the chain line in the drawing. It is possible to grip the blank 7 suspended from the holder 12 by sandwiching the blank 7 therebetween.

Further, second to fourth gripping members 22, 23,
24 is attached to a parallel link 20B provided on the lower surface of the moving member 20A. This parallel link 20B is provided so as to be movable up and down by the drive mechanism 11 while remaining horizontal, and is connected to the second to fourth gripping members 22, 23 via a horizontally supported guide shaft 20C and a feed screw shaft 20D. , 24 are suspended and supported, and the position of each gripping member 22, 23, 24 can be adjusted by rotating the feed screw shaft 20D. Note that the feed screw shaft 20D has a pit ratio of 1:2:3 for each threaded portion, so that the second to fourth gripping members 22, 23,
24 can maintain equal spacing from each other.

Furthermore, second to fourth gripping members 22, 2
Vacuum cups 22A, 23A, 24A made of rubber or the like are attached to the lower ends of 3, 24, respectively. These vacuum cups 22A,
23A and 24A are connected to a pressure reducing device (not shown), and the blank 7 can be sucked and lifted by the negative pressure generated by the reduced pressure, and the blank 7 can be placed on the blank chute 30 when the reduced pressure is stopped. .

On the other hand, the blank shoot 30 is located at a _first position P1 adjacent to the disk stack device 13 and at a _P4 position within the movement range of the feed bar 4.
and second mounting tables 31 and 32, and a third mounting table 33 provided between the two,
These first to third mounting tables 31, 32, 33
are formed at approximately the same height.

Further, each conveyance stage on the blank chute 30 is configured to be able to adsorb the blank 7 and hold it at the position where it is placed, and the third loading stage 33
Adsorbers 40 are provided at positions P ₂ and P ₃ , respectively.

As shown in FIG. 2, the third mounting table 33 is formed into a substantially slatted shape by fixing both ends of a plurality of beam-like members 33A to end members 33B and 33C provided in a direction perpendicular to the drawing. There are two adsorbers 40, one pair each.
It is fixed to an inverted trapezoidal support member 35 having a set of pulleys 34, and is movably supported along a guide rail 36 attached to a beam-like member 33A.

In addition, the adsorber 40 has a protrusion 40 provided on the side surface.
A feed screw shaft 37 is screwed into the bearing member 38 and the end member 33B.
It is rotatably supported by the P 2 and P 3 positions, and is formed so that the pitch ratio at the P ₂ and P ₃ positions is 1:2.
It is rotated by an adjustment mechanism (not shown) meshed with a bevel gear 37A near its left end, and the position of the suction device 40 can be adjusted by following the movement of the vacuum cups 22A and 23A, respectively.

In FIG. 3, a movable body 42 is housed inside a main body 41 of the suction device 40 so as to be movable vertically within a distance _H1 , and there is no attachment between the main body 41 and the movable body 42. A coil spring 43 serving as a biasing means is interposed, and the movable body 42 is biased downward with respect to the main body 41, and the bottom surface 41A of the main body 41 is biased downward.
It is locked by a stopper 41B fixed around the periphery.

A vacuum cup 44 as a suction means is attached to the upper end of the movable body 42, and the upper end of the vacuum cup 44 serves as a suction means.
It protrudes slightly from the upper surface of the mounting table 33.
Further, a bulging portion 42A is formed on the side surface of the moving body 42, and is exposed to the outside by passing through a long hole 41C provided on the side surface of the main body 41. A pressure reducing device (not shown) is connected. This decompression port 42B is connected to the moving body 42
The vacuum cup 44 is connected to the vacuum cup 44 by a pipe 42C formed inside, and the vacuum cup 44 is depressurized by the pressure reducing device to generate a negative pressure, and the blank 7 sent onto the third mounting table 33 is transferred to the vacuum cup 44. It can be reliably held in the position where it is attracted and placed. Here, the biasing force of the coil spring 43 is set to be smaller than the force by which the conveyance mechanism 20 lifts the blank 7 and smaller than the suction force due to the negative pressure generated in the vacuum cup 44, and the movable body 42 resists the coil spring 43. and can be moved upwards together with the blank 7.

Further, on the lower end surface of the moving body 42, a conduit 42C is provided.
A substantially cone-shaped vent hole 42D is formed in communication with the bottom surface 41A, and a check valve 45 as a suction release means is inserted through the bottom surface 41A.

The check valve 45 has a triangular pyramid-shaped valve body 45A that can fit into the vent hole 42D at the upper end.
It is biased upward by a spring 45B interposed between the bottom surface 41A and the valve body 45A.
2D is closed to maintain negative pressure in the conduit 42C, so that the vacuum cup 44 can be constantly adsorbed.

Further, the check valve 45 has a double nut 45C screwed to its lower end for retaining and stroke adjustment, and the upward movement distance is regulated to H ₂ (H ₂ <H ₁ ), and the movable body ₄₂ is When the vacuum cup 44 moves beyond this point, the nut 45C is locked to the bottom surface 41A, and the vent 42D is opened to relieve the negative pressure in the pipe 42C, thereby temporarily releasing the suction force of the vacuum cup 44. There is.

In this embodiment configured as described above, the following operations are performed.

That is, by the blank automatic supply device 10,
The blank 7 is taken out from the data stack device 13 to the P ₀ position, and the blank 7 is removed from the P ₀ , P ₁ , P ₂ , and P ₃ positions.
are sequentially sent to the transfer stage at P ₁ , P ₂ , P ₃ , and P ₄ positions, and automatically supplied to the P ₄ position. Further, the blank 7 sent to the _P4 position is gripped by the feed bar 4, taken into the transfer press device 1, and subjected to transfer press processing.

Here, for example, in the _P2 position, the blank 7 is fed from the _P1 position by the second gripping member 22. At this time, the movable body 42 is moved by the coil spring 4
3, the vacuum cup 44 is held at the lower limit of the movement range with respect to the main body 41, so the negative pressure is not released by the check valve 45, and the vacuum cup 44 can be sucked at all times. Therefore, the blank 7 is immediately suctioned by the suction device 40 and held at the placed position.

Next, when the blank 7 at the P ₂ position is lifted by the third gripping member 23, the suction force of the suction device 40 is temporarily released by lifting the blank 7, and the blank 7 is automatically lifted. to be released.

That is, as shown in FIG. 4A, when the blank 7 is sucked from above by the vacuum cup 23A, the vent 42D is closed by the check valve 45, and the blank 7 remains sucked by the vacuum cup 44.

However, as shown in FIG. 4B, when the vacuum cup 23A is raised, the movable body 42 is lifted together with the vacuum cup 44 adhering to the blank 7, and when the rising distance H exceeds the distance _H2 , the check valve is closed. 45 is locked to the bottom surface 41A and the vent 42D is opened, so that the negative pressure in the pipe 42C is relaxed and the suction force of the cuum cup 44 is released.

Therefore, the blank 7 is detached from the vacuum cup 44, and as shown in FIG.
2 is lowered to its original position by the coil spring 43, and the vent 42D is closed by the check valve 45. Therefore, suction force is generated again in the vacuum cup 44, and the next blank 7 can be suctioned at all times.

According to this embodiment, the following effects can be obtained.

That is, since the adsorber 40 is provided with a vacuum cup 44 that constantly generates adsorption force, the blank 7
As soon as the blank 7 is placed on the third mounting table 33, it is immediately adsorbed by the vacuum cup 44, and the blank 7 is placed on the conveying mechanism 20 in order to prevent the blank 7 from being misaligned. can be held accurately in the correct position.

In addition, the adsorption device 40 includes a vacuum cup 44.
Since a check valve 45 is provided to temporarily release the suction force when the is moved relative to the main body 41,
At the time of unloading, the blank 7 can be easily removed by lifting the blank 7.

Further, since the blank 7 is sucked by the vacuum cup 44 until it is lifted by the conveying mechanism 20, it can be accurately held while preventing displacement due to vibration or the like.

Furthermore, since the position of the blank 7 in each conveyance stage of the sequential feeding operation can be made accurate, the position of delivering the blank 7 to the feed bar 4 can be made accurate, and the transfer of the blank 7 to the transfer press device 1 can be made accurately.
The automatic feeding operation can be performed smoothly.

In addition, since the suction force of the vacuum cup 44 is automatically released by moving the vacuum cup 44 upward, the intermittent switching of the vacuum applied to the vacuum cup 44 is performed when the transport mechanism 20 is brought in and There is no need to perform it in synchronization with the unloading operation.

Therefore, it is possible to prevent a situation in which the lifting operation by the transport mechanism 20 is resisted due to a synchronization shift or the like, which hinders the blank transport, as in the conventional case.

Furthermore, since there is no need for intermittent switching as in the past, complicated timing adjustments such as synchronization can be omitted, making implementation easier. The structure is simpler than that, reducing manufacturing costs and improving reliability and maintainability.

In the adsorber 40 of the first embodiment shown above,
Although the blank 7 was adsorbed using the negative pressure of the vacuum cup 44, the adsorber 50 of the second embodiment shown in FIG. 5 uses magnetic force to adsorb the blank 7.

In FIG. 5, the suction device 50 embedded in the upper surface of the third mounting table 33 includes a movable body 52 that is movable with respect to the main body 51, and this movable body 52 has a coil spring 53 as a biasing means. The main body 51 is urged downward in the figure by the main body 51, and is normally located at its lower limit of movement.

An electromagnet 54 as an attraction means is attached to the upper end of the moving body 52, and is connected to an external power source (not shown) via an electric wire 54A, so that the blank 7 can be attracted by the magnetic force generated in the electromagnet 54.

Further, a limit switch 55 as a suction release means is provided at the lower end of the movable body 52, and its tip 55A is in contact with the bottom surface 51A, and is also interposed in a part of the electric wire 54A to cut off the current. The electromagnet 54 is configured to be able to release the blank 7 from being attracted by the electromagnet 54. Note that the other configurations are substantially the same as those of the first embodiment, so explanations will be omitted.

In this embodiment, the limit switch 55 is normally kept in contact with the bottom surface 51A, allowing electricity to be supplied from an external power source, and causing the electromagnet 54 to generate magnetic force to attract the blank 7. The blank 7 that was attracted to is lifted,
As the movable body 52 rises, the tip 55A touches the bottom surface 51.
When the blank 7 is separated from A, the limit switch 55 cuts off the current, releases the magnetic force of the electromagnet 54, and separates the blank 7.

In this embodiment, the same effects as in the first embodiment can be obtained, and since the vacuum cup 44 and the blank 7 are not adsorbed by negative pressure, the vacuum cup 44 and the blank 7
There is no need to create an airtight gap between the blank 7 and the blank 7, and as long as the material can be attracted by a magnet, even if the surface of the blank 7 has irregularities, it can be surely attracted.

It should be noted that the present invention is not limited to the above embodiments, but also includes the following modifications.

That is, the adsorption means is the negative pressure generated in the vacuum cup 44 as in each of the above embodiments, or the electromagnet 5.
The blank 7 may be attracted to the blank 7 by not only the magnetic force of 4 but also other intermittent attraction forces.

Further, as the adsorption release means, a check valve 45 that relieves the negative pressure of the vacuum cup 44 and a limit switch 55 that cuts off the power supply to the electromagnet 54 are used.
It is only necessary to appropriately select one according to the suction means, such as the above, and in short, it is sufficient that the suction force can be released in accordance with the displacement of the suction means.

For example, as shown in FIG. 6, when a vacuum cup 44 is used as the suction means as in the first embodiment, it has a small diameter portion 65A at the tip instead of the check valve 45 and can be fitted into the vent hole 42D. A sprue valve 65 may be provided on the bottom surface 41A, and the sprue valve 65 normally closes the vent 42D, and the small diameter portion 65A opens the conduit 42C to the outside air when the moving body 42 rises.

Further, as a biasing means, a coil spring 43,
Not limited to 53, springs of other shapes may be used.
Alternatively, it is not limited to a mechanical spring, but may be an air spring or the like.

Furthermore, the biasing means is not limited to one that mechanically acts on the movable bodies 42, 52, but if it biases the movable bodies 42, 52 downward as in each of the above embodiments,
Gravity due to weight or own weight may be used;
Alternatively, a magnetic field is generated around the movable bodies 42, 52 by a magnet or the like, and the movable bodies 42, 52 are
It may be configured to urge downward.

On the other hand, in each of the embodiments described above, the vacuum cup 44 and the electromagnet 54, which are adsorption means, are attached to the moving bodies 42 and 52, respectively, and the main bodies 41 and 51 are attached to the moving bodies 42 and 52, respectively.
However, for example, the electromagnet 54
The suction means itself may be movably housed directly within the main body 51, and the suction means does not necessarily have to be movably held via the movable bodies 42, 52.

In addition, the main bodies 41 and 51 are blanked by the blank shoot 30.
It is not essential to support the main bodies 41 and 51 so that their positions can be adjusted in the directions, and the main bodies 41 and 51 may be directly fixed to the third mounting table 33 if the interval between the transport stages is not adjusted as in each of the above embodiments.

Further, the third mounting table 33 itself may be used as the main body without providing any members as the main bodies 41 and 51. For example, the suction means can be directly movably supported with respect to the third mounting table 33, and the suction means can be directly movably supported and A release means may be attached to the third mounting table 33 and the suction force may be released in accordance with the displacement of the suction means with respect to the third mounting table 33.

Furthermore, in each of the embodiments described above, the suction devices 40 and 50 of the present invention were installed on the third mounting table 33, but the suction devices 40 and 50 of the present invention were installed on the first and second mounting tables 31 and 32. It may also be used to prevent the blank 7 from moving.

Further, the materials and detailed shapes of the parts constituting the adsorbers 40 and 50 may be changed as appropriate during implementation, and it is desirable to have an optimal configuration depending on the installation direction, installation position, use, etc.

[Effect of idea]

As described above, according to the adsorber of the present invention, the structure can be simplified, the object to be adsorbed can be reliably adsorbed, and the adsorption force can be automatically released when the object to be adsorbed is removed. can.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the first embodiment of the present invention;
2 is a side view showing the main parts of FIG. 1, FIG. 3 is a sectional view taken along the - line in FIG. 2, FIG. 4 is a sectional view showing the operation of the first embodiment, and FIG. FIG. 5 is a sectional view corresponding to FIG. 3 showing a second embodiment of the present invention, and FIG. 6 is a sectional view corresponding to FIG. 3 showing a modification of the present invention. DESCRIPTION OF SYMBOLS 1...Transfer press device, 7...Blank as an adsorbed object, 10...Blank automatic supply device, 30...Blank shoot, 33...Third
mounting table, 20... transport mechanism, 40, 50... suction device, 41, 51... main body, 42, 52... moving body, 43, 53... coil spring serving as biasing means;
44, 54... Vacuum cup and electromagnet as adsorption means; 45, 55, 65... Check valve, limit switch, and sprue valve as adsorption release means.

Claims (1)

[Claims for Utility Model Registration] (1) A gripping member that sucks and grips an object to be processed by a press device and reciprocates toward the press device, and moves up and down at the end of this reciprocating motion. The suction device transfers the object to be sucked between the gripping member that is arranged and moves up and down, the suction means capable of sucking the object to be sucked downward with a predetermined suction force, and the suction means for sucking the suction means. a main body that supports the main body so as to move forward and backward in the direction of the force; a biasing means that urges the suction means against the main body in the direction of the suction force with a force weaker than the suction force; 1. A suction device comprising: suction release means for releasing the suction force of the suction means when the suction means is raised by a predetermined amount or more. (2) In claim 1 of the utility model registration claim, the adsorption means is a vacuum cup whose inner part is depressurized to generate negative pressure, and the adsorption release means is a valve that allows the depressurized part to communicate with the outside air. An adsorption device characterized by: (3) Utility Model Registration Scope of Claims Paragraph 1 is characterized in that the attraction means is an electromagnet that generates magnetic force when energized, and the attraction release means is a limit switch capable of cutting off energization to the electromagnet. adsorption device.