JPH088095Y2 - Automatic nest changer - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic nesting changer attached to an injection molding machine.

[0002]

2. Description of the Related Art An injection molding machine injects a resin into a cavity provided in a mold and cures the resin to obtain a molded article having substantially the same shape as the cavity. However, if the cavity is formed directly in the mold, when molding parts having different shapes, it is necessary to replace the mold with a mold having a cavity corresponding to the shape. That is, in the case of molding a plurality of types of parts with one injection molding machine, it is necessary to prepare different molds for the respective parts and replace them each time.

However, in order to replace the entire mold as described above, a large device such as a crane device is required to replace a large and heavy mold. In addition, since it is necessary to manufacture a large number of expensive dies, there is a drawback that the manufacturing cost is high.

Therefore, there is a structure in which a mold main body and a small-sized insert having a cavity are separately provided so that a plurality of types of inserts can be selectively mounted on a common mold main body.

[0005]

The cost can be reduced by using the insert-replaceable mold as described above. However, in the conventional insert-replaceable mold device, it is necessary to remove the mold body from the molding machine, attach and detach the mold outside the molding machine, and then attach the mold body to the molding machine again.
Therefore, a crane device and the like for attaching and detaching the large and heavy mold body to and from the molding machine are still necessary, and it is inevitable to increase the size and cost of the entire injection molding unit. Also, the work of attaching and detaching the mold to and from the molding machine is troublesome and dangerous, and the work time is long. Therefore, automation of die replacement is difficult, which is one of the problems in automating the injection molding process.

Therefore, the present applicant has filed Japanese Patent Application No. 2-26174.
No. 1 proposes an automatic nesting changer capable of solving the above problems and automating the injection molding process.

An object of the present invention is to provide an automatic nesting changer capable of further miniaturizing the injection molding unit and reducing the manufacturing cost as compared with the automatic nesting changer of the prior application.

[0008]

In order to achieve the above-mentioned object, an automatic inserter changing device according to the present invention has a removable inserter in a direction substantially orthogonal to a mold opening surface in a mold opening state. A pair of molds is provided corresponding to an injection molding machine to which a pair of molds are attached, and a nest storing means and an arm.
And a rotary drive means. Nest storage means
Has multiple nesting compartments that are arranged so that they overlap vertically.
It has a storage shelf and a vertical drive means for moving the storage shelf up and down.
Have The arm means is a chuck with a removable insert
Has a section on the side surface of the tip section and is arranged on the fixed table.
And a drive means for moving the arm back and forth in the longitudinal direction.
And moving the arm in the width direction orthogonal to the longitudinal direction.
And a dynamic drive means. The rotation drive means is the arm hand
By rotating the step on a fixed table, the tip of the arm
When the end faces the direction of the mold and the tip is the
It is positioned in the state of facing the step. That
The tip of the arm is facing the mold.
By moving the arm forward by the forward / backward drive means
The tip enters between the molds with the mold open, and further drive
The arm moves in the width direction by the means,
Nesting is possible between the mold opening surface and the die opening surface.
With the part facing toward the nesting storage means, move forward and backward.
The moving part moves the arm forward and the chuck part
Is facing the one of the multiple nest storage parts and the chuck part
It is possible to send and receive a child between the child storage unit and the child storage unit. Income
The storage means moves the storage shelves up and down by driving the vertical drive means.
To store one of the
It can be selectively located at a height where it can face the chuck part.
Of.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to a preferred embodiment shown in the accompanying drawings. 1 and 2 are plan views of the entire injection molding unit including an automatic nest changing device 1 according to the present invention and an injection molding machine 2 installed in the lower part of the drawing in the vicinity thereof.

The automatic nest changing device 1 includes an arm means 4 having an arm 3 which can move forward and backward and can rotate in FIG.
It includes a nest storage means 5 and a reading means 71 . Therefore, first, the arm means 4 will be described below. In the following description, the horizontal direction in FIG. 1 is the x direction and the vertical direction is the y direction.

As shown in FIG. 4, a center hole 7a is formed in a fixed table 7 fixed on the frame 6,
A ring-shaped support 8 is fixed to the center hole 7a. The ring-shaped support 8 supports a rotary actuator 11, which is a rotary drive means, via support arms 9a and 9b and a support plate 10. The rotary shaft of the rotary actuator 11 penetrates the support plate 10 and is fixed to the rotary table 13 via the coupling 12. A ring-shaped rotary body 14 is provided on the lower surface of the rotary table 13, and the ring-shaped rotary body 14 is rotatably attached to the ring-shaped support body 8 via a rotary bearing 15. Therefore, the rotary table 13 is rotated above the frame 6 by driving the rotary actuator 11.

A protrusion 13a is formed on the rotary table 13 in a protruding manner, and a rail 16 is provided on the upper surface of the protrusion 13a. Moving drive above the turntable 13
Means are provided. The structure is on the rotary table 13.
A pair of sliders 18 on the lower surface of the base plate 17 located on the side are fitted to the rails 16, and nuts 19 are screwed onto the screw shaft 20. A motor 21 (see FIG. 1) is connected to one end of the screw shaft 20, and although not described in detail, the screw shaft 20 is rotatably supported on the rotary table 13.
Therefore, the screw shaft 20 is rotated by the drive of the motor 21, and the base plate 17 is guided by the rail 16 and the slider 18 via the nut 19 screwed with the screw shaft 20.
Move back and forth in the x direction.

Next, the structure of the forward / backward drive means will be described below.
Reveal As shown in FIG. 3, protrusions 17a are formed on both sides of the base plate 17, and rails 22 are provided on the upper surfaces of the protrusions 17a. A base plate 23 is located above the base plate 17, and a slider 23 a provided on the lower surface of the base plate 23 is fitted to the rail 22. A rodless cylinder 24 as an example of a driving unit is provided on the upper surface of the base plate 17, and a moving body 25 driven by the cylinder 24 is attached to the lower surface of the base plate 23. Therefore, the moving body 25 is moved by the cylinder 24, and the base plate 23 is guided by the rail 22 and the slider 24 to move back and forth in the y direction of FIG.

The arm 3 is located above the base plate 23, and the slider 26 provided on the lower surface of the arm 3 is fitted to the rail 27 on the upper surface of the base plate 23. Also, FIG.
As shown in FIG. 3, a screw shaft 30 is rotatably supported by a pair of support plates 28 and 29 arranged on the upper surface of the base plate 23, and a nut 31 provided inside the arm 3 is provided. Is screwed onto the screw shaft 30. FIG.
As shown in FIG. 3, a holder 32 is arranged on the upper surface of the base plate 23 on the side of the support plate 28, and a motor 33 (see FIG. 1) is held by the holder 32. A pulley 34 is connected to a rotation shaft of the motor 33, and a pulley 35 is connected to a screw shaft 30 penetrating the support plate 28. A timing belt 36 is stretched between the pulley 34 and the pulley 35. Therefore, by driving the motor 33, the screw shaft 30 rotates via the pulleys 34, 35 and the timing belt 36, and the nut 31 (see FIG. 4) screwed with the screw shaft 30 moves, so that the slider 26 and the rail 27 are guided. Arm 3 moves in the y direction in FIG.

Next, the arm 3 will be described in detail. As shown in FIG. 4, the arm 3 includes an arm main body 37 having a nut 31 and moved by driving a motor 33, and a chuck 38 attached to the tip of the arm main body 37.
It consists of and. A forked portion 38a (see FIG. 1) is formed at the rear end of the chuck portion 38.
The connecting shaft 40 is penetrated with the mounting member 39 (see FIG. 1) being sandwiched between 8a. 4 around the connecting shaft 40
One elliptical hole 41 is bored, and the fixing screw 42 is fastened to the mounting member 39 through the elliptic hole 41. In this state, the cylindrical portion 39a of the mounting member 39 is attached to the arm body 3
It is arranged in the concave portion 7 so that the angle can be adjusted. Further, four elliptical holes (not shown) similar to the elliptical hole 41 are also provided around the cylindrical portion 39a of the mounting member 39, and the fixing screw 43 is fastened to the arm body portion 37 through the elliptic hole. is there. Therefore, the fixed arm main body 37
On the other hand, in the chuck portion 38, the fixing screw 42 has the elliptical hole 4
Rotational adjustment is possible around the connecting shaft 40 within a range in which the fixing screw 43 can move within the elliptical hole (not shown), and rotation around the cylindrical portion 39a is possible.

Next, the detailed structure of the chuck portion 38 will be described with reference to FIGS. As shown in FIG. 5, the tip of the chuck portion 38 is formed in a substantially U-shape having a space 44 in the middle portion when viewed from the side surface direction, and the pair of support beams 4 is formed.
5, 46 are fixed. Cylinders 47, 48, 49, and 50 are provided at two upper and lower positions on the support beams 45 and 46, respectively.
Is attached. Cylinder 47, 48, 49, 5
No. 0 drive shafts 47a, 48a, 49a, 50a are provided with gripping members 52, 53, 5 via a joint 51 (see FIG. 6).
4, 55 are attached. As an example of such a configuration, FIG. 6 shows in detail the connection state between the cylinder 49 and the grip member 54. In this embodiment, the cylinder 4
Air cylinders are used as 7, 48, 49 and 50. As shown in FIGS. 5 and 6, the cylinders 47 and 48 attached to the front support beam 45 and the cylinders 49 and 50 attached to the rear support beam 46 have their drive shafts facing each other. It is attached. The gripping members 52, 53, 54, 55 are wider than the width of the chuck portion 38 when viewed from the upper surface, and are claw portions 52a, 53a, 54a, 55a whose ends are bent. The claw portions 52a and 54a and the claw portions 53a and 55a are formed so as to face each other. Gripping member 5
2, 53, 54 and 55 each have a pair of shafts 5
6 are fixed, and the shafts 56 are slidably held by bearings 57, respectively. Although not described in detail, pins 58c (see FIG. 1) or recesses (not shown) are formed on the insert molds 58a and 58b, and the chuck part 38 can be fitted to the insert pins 58c. Recess 59a
And a projection 59 having a projection 59b that can be inserted into the recess of the insert.

With the above-described structure, the cylinders 47, 48, and 48 are connected via the tube 70 shown in FIG. 5 (see FIG. 5).
When air is supplied to 49, 50, its drive shaft 47a,
48a, 49a and 50a are extended and gripping members 52 and 5
3, 54, 55 move inward while being guided by the shaft 56 and the bearing 57. In this way, by making the claw portions 52a, 53a, 54a, 55a difficult to fit in the groove portion 58d, as shown in FIG.
8 is capable of holding the insert dies 58a and 58b.

As shown in FIG. 5, the chuck portion 38 is provided with a space 44 in the central portion thereof, so that the chuck portion 38 is light in weight and grips an insert having a protrusion on the facing surface side. Also in this case, the protrusion can be released to the position of the space 44 so that the protrusion can be gripped without any support. Also, the support beam 4
Since the components 5 and 46 are attached as separate components to the chuck portion 38 by using unillustrated bolts or the like, manufacturing is simple.

With the above-mentioned structure, the arm means 4 having the chuck part 38 to which the insert die can be attached and detached can be rotated on the frame 6 by the operation of the rotary actuator 11, and the operation of the motor 21. By x in FIG.
In this direction, the cylinder 24 and the motor 33 can be respectively moved in the y direction in FIG. Further, the chuck portion 38 can be rotationally adjusted about the connecting shaft 40 and the cylindrical portion 39a. Therefore, the chuck portion 3 can be controlled by the user.
The reference numeral 8 advances and retracts with respect to the injection molding machine 2 and the nest storage means 5 which will be described later, and attaches and detaches the nests 58a and 58b and conveys them.

Next, the nest storage means 5 will be described. As shown in FIG. 7, the nest storage means 5 includes a frame 6 (see FIG.
The support plate 61 and the fixed table 62 are fixed on the frame 60 arranged close to the support plate 61.
A cylinder 63 as an example of vertical driving means is attached to the lower surface of the. The drive shaft 63a of the cylinder 63 is
It penetrates through the fixed table 62 and projects upward. A storage shelf 64 is arranged above the fixed table 62,
The drive shaft 6 of the cylinder 63 is attached to the lower plate 64a of the storage shelf 64.
3a is in contact. A pair of guide shafts 65 are fixed to the lower plate 64a. The guide shafts 65 extend downward through the bearing 66, the fixed table 62, the support plate 61, and the frame 60, and are fixed to the lower end portion thereof. The plate members 67 are connected to each other. The plate member 67 has a hole 67.
a is bored, and the cylinder 63 is located in the hole 67a. A stopper 65a is provided on the upper end of the guide shaft 65.
Is fixed, and the stopper 65a and the bearing 66 come into contact with each other, whereby the descending range of the guide shaft 65 is restricted.

Explaining the storage shelf 64, in FIG. 7, side plates 64b are fixed to both ends of the lower plate 64a, and the shelf plates 64c and 64d are hung between the side plates 64b. The child accommodating parts are provided so that the child accommodating portions are opposed to each other one by one.
Each of a and 69b can be stored. FIG. 7 shows a state where the nest is stored in the upper stage and the lower stage is not stored.
An upper plate 64e is attached to the upper end of the side plate 64b. A channel groove (not shown) is provided in each of the shelves 64c and 64d, and a fluid such as heated hot water or oil is circulated in the channel groove to store the nest 6
9a and 69b are preheated.

Due to this structure, the cylinder 63
When is driven and the drive shaft 63a expands and contracts, the storage rack 64 and the nests 69a and 69b stored therein move up and down. At this time, the guide shaft 65 slides in the respective holes of the bearing 66, the fixed table 62, the support plate 61, and the frame 60, and the plate member 67 slides on the outer periphery of the cylinder 63 while guiding the vertical movement of the storage rack 64. .

As shown in FIGS. 4 and 8, a reading means 71 is provided at the tip of the fixed table 7. In the reading means 71, a rectangular frame 73 is supported by the legs 72. A cylinder 74a is provided on the lower surface of the upper plate of the frame 73.
Is attached, and a bar code reader 77a is fixed to a moving body 75a driven by this cylinder via a mounting plate 76a. A cylinder 74b for driving the moving body 75b is attached to the upper surface of the lower plate of the frame 73, and a bar code reader 77b is fixed to the moving body 75b via a mounting plate 76b. Therefore, in the frame 73, the bar code readers 77a and 77b face each other and can move independently in the left-right direction in FIG. 8 (the y direction in FIG. 8). Further, inside the frame 73, the nests 58a, 5
The arm 3 can be inserted with the 8b attached, and at this time, the cylinders 74a and 74b are driven to scan the bar code readers 77a and 77b, whereby the nest 58 is inserted.
It is possible to read the bar code 78 (see FIG. 1) as identification information provided on the upper surface or the lower surface of the a and 58b. The barcode 78 indicates the type of each nest, and the type of nest can be determined by reading this with the barcode readers 77a and 77b.

The injection molding machine 2 shown in FIG.
Is provided at a position (downward in the drawing) which makes an angle of about 90 ° with the nest housing means 5 about the rotation axis of the arm means 4. The molds 68a and 68b (in this embodiment, the movable mold 68a and the fixed mold 68b) are
Nest insertion recesses (not shown) to which the nests 58a and 58b can be attached and detached are provided at right angles to the parting line surface (PL surface), and the nests mounted in the nest insertion recesses are fixing means. A key (not shown) as an example of the mold 5
It is fixed by inserting it into a key groove (not shown) provided in parallel with the PL surface of 8a and 58b. Therefore, FIG.
By closing the molds 68a and 68b from the mold open state shown in FIG. 3, the molding material is injected into the cavity (not shown) formed between the inserts 58a and 58b, and a resin molded product is obtained.

The construction of the injection molding unit of this embodiment is as described above, and the chuck portion 38 of the arm means 4 allows
The inserts attached to the molds 68a and 68b of the injection molding machine 2 are grasped and extracted, and the inserts are conveyed to the insert storing means 5 for storage, and the other inserts stored in the insert storing means 5 are also stored. The insert is replaced by gripping and transporting it to the injection molding machine 2 and mounting it on the molds 68a and 68b. The details of such an operation will be described below. In the following description, the molds 68a and 68b are preliminarily attached to the inserts 58a and 58b, and the new inserts are attached to the molds 68a and 58b.
It is shown as a, 69b.

In the injection molding machine 2, the molds 68a,
A case will be described in which the molded parts production by the inserts 58a and 58b mounted on the 68b is completed and another part having a different shape is produced. First, in the mold open state shown in FIG. 1, the cylinder 24 is operated on the base plate 17 to move the base plate 23, and the arm 3 is moved on the base plate 23 by the operation of the motor 33 in the y direction, respectively. 38 is positioned in the gap between the molds 68a and 68b. At this position, the motor 21 is operated to move the base plate 17 in the x direction to bring the chuck portion 38 close to the movable die 68a, and the pin 58c of the insert 58a is fitted into the recess 59a. The extraction insert 58a is released from the mold 68a. At the same time, the cylinders 47, 48,
Air is supplied to 49, 50, and the claw portions 52a, 53a, 54
a and 55a are moved inward toward each other to form the groove portion 58d.
It is difficult to insert it, and the insert 58a is gripped by the chuck portion 38 (see FIG. 6). Then, the motor 21 is operated to move the chuck portion 38 in the x direction to completely remove the insert 58a from the movable die 68a.

In this way, the insert 58a is held by the arm 3, the cylinder 24 and the motor 33 are operated to move the base plate 23 and the arm 3 in the y direction, and the arm means 4 is contracted. In this state, the rotary actuator 11 Is operated to rotate the rotary table 13 by 90 ° in the clockwise direction. That is, the longitudinal direction of the arm 3 is located in the x direction,
The arm means 4 as a whole is moved so that the chuck part 38 faces the insert housing means 5. This state is shown in FIG. Then, the cylinder 24 and the motor 33 are operated again to move the base plate 23 and the arm 3 in the x direction, and the chuck portion 38 is positioned in the gap between the pair of nest accommodating portions of the nest accommodating means 5. Then, the motor 21 is operated to move the base plate 17 in the y direction to bring the chuck portion 38 close to the storage shelf 64, and the nest 58a is positioned in the lower nest storage compartment in the unstored state. Then cylinders 47, 4
The air supply to 8, 49, 50 is stopped, and the claw portions 52a,
53a, 54a, 55a are separated from the groove 58d, and the insert 5
8a is detached from the chuck portion 38 and placed on the shelf plate 64c. It should be noted that replacement nests 69a, 69b are stored in advance in the upper nest storage section of the nest storage means 5, and the bar code 78 is read by the reading means 71 to confirm the type and then the storage shelf 64. Is set in a raised state as shown by the chain line in FIG. This work will be described later.

When the nest 58a is placed on the shelf board 64c,
By operating the cylinder 63, as shown in FIG.
Lower 4 Then, the insert 69a and the chuck 38 housed in the upper nest housing are located at positions facing each other. Then, insert the pin 69c of the insert 69a into the recess 5
9a and the cylinders 47, 48, 4
Air is supplied to 9, 50, and the claw portions 52a, 53a, 54
A and 55a are made to fit into the groove portion 69d, and the insert 69a is gripped by the chuck portion 38. Then, the motor 21 is operated to move the chuck portion 69 in the y direction of FIG. 2, and the nest 69a is completely ejected from the storage rack 64.

When the nest 69a is held by the arm 3,
The cylinder 24 and the motor 33 are operated to operate the base plate 23.
2 and the arm 3 is moved in the x direction in FIG. 2 and the arm means 4 is contracted, the rotary actuator 11 is operated to rotate the rotary table 13 counterclockwise by 90 °, and the chuck portion 38 is again moved to the injection molding machine. The entire arm means 4 is moved so as to face the direction 2. Therefore, the cylinder 24 and the motor 33 move the base plate 23 and the arm 3 to y.
The chuck part 38 to move the molds 68a, 68b.
Located in the gap. Then, insert 69a into mold 68a
The motor 21 moves the base plate 17 in the x direction in FIG. Then, the supply of air to the cylinders 47, 48, 49, 50 is stopped, and the claws 52a, 53a, 54a, 55a are connected to the groove 69d.
Separated from the above, insert the key and insert the insert 69a into the mold 68.
Fix to a.

When the replacement of the insert of the movable side mold 68a is completed as described above, the base plate 17 is further moved in the x direction of FIG.
8 is brought close to the fixed side mold 68b, and the convex part 59b is fitted in the concave part (not shown) of the insert 58b, the key is extracted, the insert 58b is released from the mold 68b, and the cylinder 47 , 48, 49, 50 are supplied with air,
The claws 52a, 53a, 54a, 55a are moved inward toward each other so that the groove 58d is not easily inserted, and the nest 58b is inserted.
Is gripped by the chuck portion 38. After that, similarly to the case of the movable side, the arm 3 is expanded and contracted and rotated to store the nest 58b in the lower nest storage portion of the nest storage means 5, and the storage shelf 64 is lowered to move the upper nest. The insert 69b housed in the housing is gripped by the chuck 38, and the arm 3 is rotated again to mount the insert 69b on the mold 68b.

In this way, the inserts 58a, 58b preliminarily mounted on the molds 68a, 68b are replaced with the other inserts 69a, 69b stored in the insert storing means 5.

Next, the preparatory work for the above-mentioned nest exchange process will be described. Before use, the user manually stores the replacement inserts 69a, 69b in the lower insert storage part (on the shelf board 64c) of the insert storage means 5. Then, the cylinder 63 is driven to raise the storage shelf (shown by a chain line in FIG. 7), and the arm 3 is driven to face the lower nest storage portion and hold the replacement nest 69a. After the replacement insert is removed from the lower insert storage part, the storage rack 64 is lowered while the arm 3 is temporarily retracted from the storage rack 64, and then the arm 3 is moved toward the storage rack 64 again. During this process, the arm 3 is stopped when the replacement insert 69a grasped by the arm 3 is positioned inside the reading means 71,
Bar code reader 7 that operates cylinders 74a and 74b
7a and 77b are scanned. When the scanned barcode readers 77a and 77b face the barcode 78 (see FIG. 1) provided on the upper surface or the lower surface of the replacement insert 69a, the barcode 78 is read to replace it. The type of 69a is discriminated and it is confirmed whether or not a proper insert is gripped. When the proper insert 69a is gripped, the arm 3 is opposed to the upper insert storage portion of the storage shelf 64, and the replacement insert 69a is placed on the shelf board 64d. Similarly, the other replacement nest 69b is also housed in the upper nest housing section. In this way, the replacement nest 69
In the state in which a and 69b are stored in the upper nest storage section of the nest storage means 5, the nest exchange process described above is performed. It should be noted that if the user manually stores the replacement insert in the upper insert storage part, the work is labor-intensive and highly dangerous. After being manually inserted into the part, the arm means 4 is used to move to the upper nest storage part. As described above, the safety of the replacement insert is improved by manually inserting and removing the replacement insert.

Further, after the nest exchange process is completed, the used nests 58a, 58 housed in the lower nest housing section while the parts are being manufactured by the injection molding machine 2.
After the user takes out b, the next replacement insert is stored in the insert storage means 5 in the same manner as described above. In this way, since the storage of the replacement insert for the next part production and the confirmation of the type are performed during the molding, the work can be performed efficiently without waste of time. Further, since the replacement insert is preheated by heating the storage rack 64, it is possible to immediately proceed to the injection molding process when the replacement work of the insert is completed.

Since the present invention has a structure in which only the relatively lightweight and small-sized insert is replaced, it does not require a large and high-strength device such as a crane for holding the entire mold, and is small and lightweight. Since the nest can be held by the arm 3, the entire injection molding unit can be made extremely compact.

The nest storage means 5 has an upper and lower two-stage nest storage portion and is of an elevator type structure which can be moved up and down by the cylinder 63, so that it does not require much space and can be used for a large number of replacement stores. Can store children efficiently. Conventionally, up and down 2
When using a nest storage means having a step nest storage section,
In addition to the XY table mechanism, the rotation mechanism, etc., the arm means 4 required a mechanism for moving up and down in order to face the upper and lower nest storage parts. Therefore, the arm means is provided with various drive mechanisms, and the structure thereof is extremely complicated. However, in the above configuration, it is not necessary to provide a mechanism for moving the arm means 4 up and down, and the configuration is simplified. It should be noted that the configuration is not limited to the upper and lower two-stage configuration as in the above-described embodiment, and may be a configuration having three or more stages. Further, the depth can be increased and a large number of nests can be juxtaposed in one stage. In this way, storing a large number of replacement inserts is effective for automation of injection molding.

In the above-described embodiment, the cylinders 47, 48,
Since 49, 50 and the gripping members 52, 53, 54, 55 are provided, a very large space is not required even when gripping the work, which contributes to downsizing of the apparatus. Further, since the four cylinders 47, 48, 49 and 50 are operated at the same time, the drive mechanism thereof is also simple. Since the insert is mechanically grasped by the grasping member as described above, the reliability is high in grasping the metal insert.

The extension and contraction of the arm 3 is performed by moving the base plate 23 by the cylinder 24 and by the motor 33.
Since it is a two-step type with the movement of the arm 3, the length of the arm 3 in the longitudinal direction can be made extremely short to make it compact, and the cylinder 24 and the motor 3
By operating 3 at the same time, the operation time for moving the arm 3 forward by a predetermined distance can be shortened. In this two-stage configuration, one is driven by the cylinder 24, which has a low manufacturing cost, and the other is driven by the motor 33 and the screw shaft 30, which are easy to perform fine adjustment. I am configuring.

In the above embodiment, one die is attached to one die, but the present invention is not limited to this, and a plurality of die insertion recesses are provided in one die. It is also possible to provide and install a plurality of inserts.
In such a case, the chuck mechanism of the arm 3 is naturally also shown in FIG.
It is necessary to replace the configuration shown in FIG. 6 with a configuration in which a plurality of inserts can be grasped on one surface of the arm 3, but in the above configuration, the arm 3 is a two member of the arm body portion 37 and the chuck portion 38. Therefore, it is possible to easily deal with various inserts by exchanging only the chuck portion 38.

Such an example is shown in FIGS.
The mold 79 shown in FIG. 9 is provided with four recesses 79a. Nests 80a, 80 insertable in the recess 79a
b, 80c, 80d are integrally connected by connecting plates 81, 82a, 82c. The detailed structure is shown in FIG.
Is shown in. The connecting plate 81 has cutouts 81a, 81b,
81c, 81d are provided, and the cutouts 81a,
81b, 81c and 81d have nests 80a, 80b and 80
c and 80d are fitted together, and connecting plates 82a and 82b for preventing the falling of the nesting are fixed to the upper and lower parts thereof with bolts 97. The connecting plates 82a and 82b are the pins 81.
The cutout portion 81 is regulated and positioned by e.
In the space defined by a, 81b, 81c, 81d and the connecting plates 82a, 82b, the nests 80a, 80b, 80c,
80d is held with a slight gap (about 0.1 to 0.2 mm). In this way, the nests 80a, 80b, 8
0c and 80d are connected, and in this connected state, they are attached to and detached from the mold 79. In this case, the inserts 80a, 80b, 80 are still attached with the connecting plates 81, 82a, 82b still attached during injection molding.
Molding is performed by a cavity (not shown) provided in c and 80d.

11 (a) and 11 (b) show a chuck portion 83 capable of gripping a plurality of (four in this embodiment) inserts to be mounted on the mold 79 having the above-mentioned structure. The chuck portion 83 is provided with a bifurcated portion 83a, a through hole 83b, and an elliptical hole 83c, and the outer shape and the attachment method to the arm body portion 37 are the same as those of the chuck portion 38 described above. And
A "day" -shaped nest holding portion 83d is provided in the middle portion, and support beams 84 and 85 are attached to the front and the rear thereof, respectively. The air cylinder 8 is attached to the support beams 84 and 85.
6, 87 are attached to the cylinders 86, 8
Gripping members 89 and 90 are attached to the drive shafts 86 a and 87 a of the No. 7 via a joint 88. The cylinder 86 attached to the front support beam 84 and the cylinder 87 attached to the rear support beam 85 are attached so that their drive shafts face each other. And
The gripping members 89, 90 are wide when viewed from above,
The respective ends are bent to form claws 89a and 90a. The claws 89a and 90a are formed so as to face each other. Four shafts 91 are fixed to the gripping members 89 and 90, respectively, and the shafts 91 are slidably held by bearings 92, respectively. In addition,
Pins 80e, 80f, 80g, and 80h are formed on the inserts 80a, 80b, 80c, and 80d shown in FIG. 9, and the chuck portion 83 is formed with a recess 93 that can be fitted into the pins.

With the above construction, as shown in FIG. 11, when air is supplied to the cylinders 86 and 87 from the tube 94, the drive shafts 86a and 87a of the cylinders 86 and 87 are extended and guided to the shaft 91 and the bearing 92. While being held, the gripping members 89 and 90 move inward. In this way, the claw portions 89a and 90a sandwich the connecting plate 81, so that the chuck portion 83 can simultaneously hold the nests 80a, 80b, 80c, and 80d. In addition, the inserts 96a, 9 connected to the opposite surface of the chuck portion 83 by a similar connecting plate 95.
6b, 96c, 96d can be sandwiched. Nest 80a,
Since 80b, 80c, and 80d are held with a slight gap, they can be inserted into the recess 79a while being slightly moved when mounting from the arm 3 to the mold 79, and a slight error can be allowed, so the work is easy. Is.

As described above, when the structures of the die and the insert are changed, the chuck 38 for holding one insert, the chuck 83 for holding a plurality of inserts, and the like are prepared, and the chucks are prepared. Since only the part needs to be replaced, it is rational without the need to replace the entire arm. Further, since the chuck portions 38 and 83 can be rotationally adjusted with respect to the arm main body portion 37, fine adjustment can be performed so that the chuck portion 38 can approach the nesting insertion concave portion of the mold at an appropriate angle and positional relationship. Is.

In the above embodiment, when replacing the nest,
First, after replacing the insert of the movable side mold, the insert of the fixed side mold was replaced.However, the present invention is not limited to this. The inserts of the side molds may be exchanged, or the inserts of both molds may be removed and then the inserts may be attached to both molds. In the embodiment, the nest removed from the mold is stored in the upper nest storage section of the nest storage means 5.
I replaced it with the one that was taken out from the lower nest storage section, but reverse these and store the nest removed from the mold in the upper row and replace it with the one that was stored in the lower row beforehand. Good.

The frame 6 provided with the arm means 4 and the frame 60 provided with the nest housing means 5 may be common.

In the above embodiment, the heated fluid is passed through the shelf 6
4c and 64d are circulated, but the shelf boards 64c and
The nichrome wire may be embedded in 64d and a current may be passed through the nichrome wire to preheat the insert, and various other methods are applicable.

Further, in the above embodiment, the insert is inserted and removed at right angles to the PL surface of the mold, but the present invention is also applicable to the case where the insert is inserted and removed in parallel to the PL surface of the mold. The present invention can be modified in various ways.

[0047]

[Effect of the Invention] According to the automatic insert changing device of the present invention, the insert can be automatically removed from the mold and stored in the storage part, and another type of insert of the storage part can be attached to the mold. As a result, the automatic operation of the injection molding unit becomes possible. Further, since only the nest is replaced, the replacement device itself can be downsized, and the replacement work becomes safer. Further, since the nest storage means is provided with a plurality of rows of nest storage portions and has an elevator type structure that can be moved up and down by the drive means, a large number of replacement nests can be efficiently used without requiring much space. Can be stored. Therefore, it is not necessary to provide a mechanism for moving the arm means up and down, and the structure is simplified. Further, the arm means can be moved back and forth.
Not only the state that the rotation drive means faces the mold
Since it can be rotated to the nest storage means,
There is no need to arrange the nesting storage means side by side with the mold,
The degree of freedom in body layout design is improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway reduced plan view of an injection molding unit including an automatic nest changer of the present invention.

FIG. 2 is a partially cutaway reduced plan view of the injection molding unit showing an operating state of the automatic nest changing device.

FIG. 3 is a rear view of the main part of the arm means of the automatic nest changer.

FIG. 4 is a side view of an essential part of arm means.

FIG. 5 is an enlarged side view of the main part of the chuck part of the arm means.

FIG. 6 is an enlarged plan view of an essential part of a chuck section.

FIG. 7 is a front view of a nest storing means of the automatic nest changing device.

FIG. 8 is a front view of a reading unit of the automatic nest changing device.

FIG. 9 is an enlarged perspective view of essential parts showing another embodiment of the mold and the insert.

FIG. 10 is an enlarged plan view of a connecting plate.

FIG. 11 is an enlarged plan view and side view of an essential part showing another embodiment of the chuck part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automatic inserter changer 2 Injection molding machine 3 Arm 4 Arm means 5 Insertion storage means 58a, 58b Insertion 63 Cylinder (driving means) 64 Storage shelves 68a, 68b Mold 69a, 69b Insert 79 Mold 80a, 80b , 80c, 80d Nested 96 Nested

Continuation of front page (72) Kenji Kamio 4-1-1 Taihei Taida, Sumida-ku, Tokyo Inside Seikosha Co., Ltd. (56) Reference JP-A-4-86225 (JP, A) JP-A-3-272822 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. When the mold is open, the mold opening surface is substantially
An automatic nest changer for an injection molding machine, in which a pair of molds having detachable nests in a direction orthogonal to each other are attached, and having a plurality of nest accommodating portions arranged so as to be vertically stacked. You
Storage shelves and vertical drive means for moving the storage shelves up and down.
A nested housing means including, solid has the die insert the chuck portion detachable from the distal end side
The arm arranged on the fixed table and the above arm are long
A forward / backward drive means for moving back and forth in the hand direction, and the arm as a long
A movement drive means for moving in the width direction orthogonal to the direction.
For rotating the arm means and the arm means on the fixed table.
With the tip of the arm facing the direction of the mold,
And a state in which the tip end faces the direction of the nest storage means.
And a rotary drive means for positioning the on purpose, in the state in which the tip is directed in the direction of the mold, the upper
The forward / backward drive means causes the arm to move forward.
The tip of the mold enters between the molds in the mold open state,
Further, the width of the arm is increased by the movement driving means.
By moving the chuck part and the mold opening surface of the mold.
It is possible to transfer and receive the nest between the two, and the tip end faces the direction of the nest housing means.
And the arm is moved forward by the forward / backward drive means.
By doing so, the chuck part can be installed in the plurality of nest storage parts.
The chuck portion and the nest storage portion are opposed to each other with the gap.
It is possible to send and receive the nest between them, and the nest storing means is moved up and down by driving the up-and-down driving means.
By moving up and down the storage shelves,
Selectively faces one of the storage parts with the chuck part
An automatic nesting changer that can be positioned at a height possible .