JPS6292820A - Mold-carrying device in automatic mold changer - Google Patents

Abstract

PURPOSE:To prevent excessive force from applying to a mold by a method wherein a force to carry a mold in and out of the mold mounting part of an injection molder is transmitted from a driving source through specified springs to the mold for the carrying of the mold in and out of the mold mounting part. CONSTITUTION:When a mold 30 is carried in an injection molder 20 or when the mold 30 is carried out of the injection molder 20 onto the mold seating stand of a mold changer, the mold 30 is shifted by transmitting the force from a driving source through a spring mechanism 64 equipped on the chain 61c of a mold carrying device 60 from a carrying means 66 to the mold 30. Even if excessive force due to the inertia force of the driving source or the like is applied, the force is absorbed by the spring mechanism 64 and consequently no excessive force is applied to the mold 30, the transmission device 60 and the like and no damage occurs in the mold 30, the transmission device 60 and the like.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention is! 34 Concerning the mold conveyance device of an automatic mold changer in extrusion molding, it is particularly used in a type of mold conveyance device that conveys the mold by driving the conveyance means engaged with the mold with a transmission means such as a chain. The present invention relates to a mold conveyance device in which a transmission means and a conveyance means are connected so as to be able to absorb shocks applied to the transmission means at the start and stop of conveyance.

Gold used in vJ exchanger for molds for conventional technology indexing molding machines! The 8+ conveyance device is disclosed in, for example, the patent application filed by the present applicant in 1982-2.
No. 71870, the above-mentioned device uses a motor to drive a chain fixed to a traveling body to make it travel, thereby transporting a mold engaged with the traveling body. however,
As a result of the running body and the chain being firmly attached, an unreasonable force is applied to the regenerate due to inertia when the conveyance is stopped, reducing the life of the chain, and if the chain breaks, the conveyance device and even the injection molding machine itself may be damaged. is unable to drive. If the 2P@ of the chain is unreliable as described above, the reliability of operation of the conveying device will be impaired, which is particularly inconvenient when the conveying device is operated unmanned. Furthermore, in order to avoid this, it is necessary to frequently replace the chain, which increases labor and cost and reduces productivity.

Problems that the invention aims to solve: In the automatic mold changer of an injection molding machine, the power is transmitted from the drive source! An object of the present invention is to provide a mold conveyance device that absorbs the instantaneous force applied to the transmission device when the mold transportation is stopped and prevents damage to the transmission device, mold, etc. when the mold is moved via a PM device. .

Means for Solving the Problems The present invention automatically transports and transports molds between a mold mounting section disposed on the side of an injection molding machine and a mold mounting section for injection molding,
The above-mentioned problem was solved by constructing a mold conveying device in an automatic mold exchanger that automatically exchanges molds so that the force from a driving source for moving the molds is transmitted to the molds via a spring.

When the working mold is moved and reaches a predetermined position and comes into contact with a stopper or the like and stops, the operation of the drive source also stops, but a force acts to further move the mold due to inertia or the like. However, since the force of the drive source is transmitted to the mold via the spring, the conflicting force generated when the mold stops is absorbed by the spring, resulting in excessive force on the transmission device between the drive source and the mold, and on the mold. prevent the addition of

Example Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 to 8 show automatic mold exchange for an injection molding machine equipped with a mold conveying device according to an embodiment of the present invention.
The mold exchanger 10 is a mold attaching part 21 of an injection molding machine 20.
That is, the fixing l of the mold clamping device for injection molding R20: A rotary table device 40 disposed on the side of A22 and the movable platen 23 and equipped with a rotary table 50, and the mold 3 on the table 50.
0 (four molds in this embodiment) toward the mold mounting section 21 and transport device ff16 for transporting the molds in the opposite direction.
0, and a mold clamping device 70 for detachably mounting the mold 30 on the mounting portion 21.

Each mold 30 consists of a fixed mold 31 and a movable mold 32, and the external dimensions of the molds 31 and 32 when joined together are substantially equal to each other, and the distance between the outer surfaces of the fixed and movable molds 31 and 32 is In the mold touching state, the mold attachment is set to be slightly smaller than the distance between the fixed platen 22 and the movable platen 23 at the time of removal. For this reason, various molds are newly manufactured with the same external dimensions, and in the case of existing molds, for example, the side end of the mold mounting part that protrudes outward from the main body of the mold 30 and That is, the large diameter portions 31a and 32a are attached by bonding and fixing a dimension adjustment plate to the surface side end surface.

A plurality of mold placement parts each having the same configuration are provided on the upper surface of the rotary table 50, and in this embodiment, as shown in FIG. 51 are arranged at angular intervals of 90 degrees. Each mounting section 51 slidably supports the joined mold 30, and has a pair of roller rows 52, 5 extending parallel to each other in the radial direction of the table.
2, and a round bar-shaped guide member 53 is fixed to the surface of the table 50.1 by a support frame 54 having a right triangular cross section immediately outside and above each roller row 52 (FIG. 1). The mold conveyance path is formed in cooperation with the mold conveyance path. The outer end of the guide member 53 is bent outward to facilitate the conveyance of the mold 30 into the conveyance path. Further rotary table 5
An inner stopper 55 (see FIG. 2), which is shaped like a letter in plan view, is fixedly installed on the upper surface of the mold 3 at the inner end position of the mold conveyance path.
In addition, the stopper 55 is provided with a limit switch S5 that detects contact with the mold 30 by 1".
A guide hole 56 is formed between the roller on the R outer end side of the roller row 52 and the adjacent roller, and a mold stopper 58, which will be described later, is slidably inserted into the guide hole 56. There is.

The machine frame 80 is an assembly of various square pipes, etc., and the middle part of this machine frame 80 forms the base 41 of the rotary table 50 configured as described above. A plurality of thrust ball bearings 41a support and cover the table 50 in the height direction on the upper surface of the peripheral edge 7 of the base 410, and a radial bearing, for example, an A-ille bearing, supports the rotating shaft 50a of the table 50 in the center. Resistance bearings 4 and 1b are provided, respectively, so that the table 50 can rotate smoothly even when a mold 30 of equivalent ff1ffi is placed thereon. The rotating shaft 50a of the table 50 is
Anti-procket 50b and motor 42 fixed to its lower end
The sprockets 4.2a fixed to the output shaft of the motor 42 are connected to each other so as to be driven by a motor 42 via a chain 43 stretched between the sprockets 4.2a. In addition, four protrusions (not shown) having different radial positions are provided on the lower surface of the table 50 as means for detecting the rotational position of the rotary table 50, for example, at angular intervals of h < 90 degrees. On the upper surface of 41, four limit switches 81 to S4 are arranged on the same radial axis and are actuated by the four projections D1 to D4, respectively. Furthermore, a rotary table 50 is provided on one side of the machine frame 80.
The guide member 44 is aligned with the conical hole 57 provided on the lower surface of the guide member 44.
and an air cylinder 45 is fixedly installed, and a circular Slt-shaped end 46
A rotation stopper 40 having a diameter of 1.a is fixed to a cylinder rod 45a of an air cylinder 4ε), and is driven forward and backward by the air cylinder 45 to slide within the guide hole 4a of the guide member 44.

Furthermore, as shown in FIGS. 3 and 4, this rotating shaft] ~
A link 47 is provided between the buckwheat noodles 4G and the mold stopper 58. One end of the link 47 is rotatably connected to the lower end of the mold stopper 58, and the other end is connected to a link 47'. are rotatably connected to each other, and a tension spring 48 is connected to the outer end of the link 47', which urges the mold stopper 58 upwardly through the link 47 to fit it into the guide hole 56. The intermediate portion of the link 47' is pivotably supported by a shaft 49 fixed to the rotary table 50.
Its inner end protrudes into the advancing and retracting path of the rotary stopper 46, and when the rotary stopper 46 is fitted into the hole 57, the link 4
7' is rotated counterclockwise with its inner end abutting against the circumferential surface of the rotation stopper 46, and is connected to the mold stopper 5 via the link 47.
8 is moved downward.

The transport device 60 is disposed in the upper part of the machine frame 80, and includes a motor 61 fixed to the upper end of one side frame of the machine frame 80, and a subblock h61a fixed to the motor shaft of the motor 61 and the other side. A chain 61c is stretched between the driven subblocks 1 to 61b provided at the upper end of the side frame. The traveling body 63 is connected to the guide rail 62 extending between both sides of the frame 80 below the chain 61G by spline connection, for example.
is non-rotatably but slidably supported 1), and the traveling body 63 is connected to a chain 61C via a connecting means 64.

The traveling body 63 has a conveying means 66 equipped with an air cylinder 65.
The rear end of the conveying means 66 is fixed with a bolt, and a pair of mold capturing means 67 is rotatably supported at the front end of the conveying means 66 via a bin 66a. The rear end of the air cylinder 65 is rotatably supported by the intermediate projecting wall of the general feeding means 66 via a pin 66b, and the tip of the cylinder rod 65a is rotatably supported by a pin 67a connecting the pair of mold catching means 67. They are freely connected.

Furthermore, each mold capturing means 67 has a notch 67b formed on its lower surface, and is provided protruding from the side surface of the large diameter portions 31a and 32a of the fixed and movable molds 31 and 32 of the mold 30 on the conveying device 60 side, respectively. Engaged to a pair of engagement arms 31a', 32a'! It's made me feel happy.

As shown in FIG.
A rod 61d is screwed into the threaded inner circumferential surface of 1 so that it can move forward and backward.
, , 61e, and after adjusting the tension of the chain 61c by moving the rods 61 and 61e back and forth, it is fixed with nuts 61 (1 and 61h), as shown in FIG. In addition, a connecting means (connecting equipment) is provided in the middle of the chain 61c integrally with the chain 61C.
64 rod members 64a are interposed, and an end member 64b is slidably fitted to the front end of the rod member 64a, and one end of the hollow cylindrical portion 64C is screwed and fixed to the threaded stepped portion of the end portion 64b. A rod member 64a is slidably inserted into the closed end wall. The annular spring receiver housed in the hollow cylindrical member 64C has a member 64d attached to the rod member 64.
Coil springs 64e and 6 are fitted and fixed to a by welding or the like, and the end member 64b and the spring receiver are interposed between the member 646 and between the member 64d and the closed end wall of the cylindrical member 64c.
4f is fitted onto the rod member 64a.

Further, a connecting plate 64o is integrally provided on the peripheral wall of the cylindrical member 64c, and the entire connecting means 64 is fixed to the traveling body 63 via the connecting plate 64 with bolts and nuts.

As shown in FIGS. 7 and 8, the mold clamping device 70 is disposed on each opposing end surface of the fixed platen 22 and the movable platen 23 of the injection molding 120, and is connected to the fixed and movable molds 31.
The clamping device 70' disposed at the lower edge of the movable platen 23 consists of four clamping devices that can face the upper and lower edges of the large-diameter portions 31a and 32a of 32, and each structure is approximately the same. I will explain about it. The clamping device 70' includes a roller row 71, and the roller row 71 is aligned with the roller row 52 of the mold mounting section 51 and the roller row 52, and the injection molding 12 is
In cooperation with the roller row 24 (FIG. 1) provided at 0, the mold 30 is supported in the height direction when the mold is carried in and out of the mold mounting section 21. Reference numeral 72 denotes a mold support member having a hole for supporting one end of each roller shaft of the roller row 71, and bolts 72a, 72
li on the movable plate 23 at a! 16, and this mold support member 72 has a mold support member 72' having an L-shaped cross section and a hole for supporting the other end of the roller shaft, and a mold support member 72' that is interposed between both mold support members 72 and 72'. flat plate 72″ and guide block 73
are fixed together with a fixing bolt 73a. Further, air cylinders 74 and 74 are installed on the bottom surfaces of the mold support member 72' and the flat plate 72'' through the guide holes 73 of the guide block 73.
b, fixedly aligned with 73b. A clamp member 76 is connected rotatably around a shaft 75a of the connector 75 via a connector 75 fixed to the upper end of each cylinder rod 74a, and is slidable in the guide hole 73b with a slight play. A wedge-shaped engaging member 32b is inserted through the wedge-shaped engaging member 32b, and the inclined surface 76a of the upper end on the side of the #J board 23 is screwed and fixed to the end surface of the lower edge of the large diameter part 32a of the movable mold 31 on the side opposite to the movable board. It can be freely engaged and detached from the opposing inclined surface. In addition,
A clamping device having the same structure as the clamping device 70' is provided at the lower edge of the fixed platen, but the clamping devices at the upper edges of the movable platen 22 and the fixed platen do not include the roller row 71. 8th
In the figure, reference numeral 238.23a denotes a stopper protruding from the surface of the movable platen 23, which abuts and holds the mold 30 at the mold number (44) position, which is the unloading end position.

Note that a stopper is similarly provided on the fixed platen 22 side, and a limit switch (not shown) for detecting contact of the mold 30 is attached to the stopper.

Hereinafter, an automatic mold exchange method according to an embodiment of the present invention will be described based on the operation of the automatic exchange machine 10 for injection molding having the above configuration.

First, the mold 30 is placed on each of the 50 molds placed m51 on the rotary table of the mold exchanger 10, with the fixed mold 31 and the movable mold 32 joined together, and transported by appropriate transportation means (not shown). Equipment has been installed. Next, the mold clamping mechanism is driven to move and position the movable platen 23 to the mold exchange position, and then, before starting the injection molding cycle, the required mold 30 is placed in the injection molding machine 20 in the mold removal state. In order to mount the motor 42, the control device (not shown) rotates the motor 42, and the rotating shaft 50a of the rotary table 50 is rotated by the rotation of the motor through the sprocket 42a, the chain 43, and the sprocket 50b.
is rotationally driven, and the rotary table 50 supported by the base 41 via the ball bearing 41a smoothly rotates. and,
When the rotary table 50 rotates, four limit switches 81 to S4 (not shown) on the top surface of the base 41 operate in sequence and output an output, and the corresponding ones on the mold mounting section 51 are connected to the mold mounting section of the injection molding machine 20. Based on the detection output of the limit switch when the mold 30 faces the mounting part 21, it is determined that the desired mold 30 faces the mounting part 21, and when the rotation of the motor 42 is stopped and the air cylinder 45 is activated, the cylinder rod 45a The rotation stopper 46 integrated with the rotation stopper 46 moves upward in the guide hole 4a of the guide part 044 and fits into the conical hole 57 of the rotary table 50,
The table 50 is securely locked in this rotational position. The upward movement of the rotation stopper 46 pushes up the inner end of the link 47' that protrudes into the advancing/retreating path of the stopper 46, and the link 47' rotates counterclockwise in FIG.
A mold stopper 58 connected to the outer end of the link 47' via the link 47 resists the spring force of the tension spring 48 and moves the mold to the position shown by the two-dot chain line in FIG. Guide hole 5 until it does not interfere with 30.
6, and as a result, the mold is allowed to be carried out.

Next, the air cylinder 65 of the conveying means 66 in the position shown in FIG.
5a is 114, a pair of mold capturing means 67 rotates counterclockwise around the bin 66a, and each means 67b engages the engaging arm 31a' of the mold 30.

32a' respectively. Then, the motor 61 is rotationally driven, the chain 61c stretched between the sprockets 61a and 61b rotates, and the traveling body connected to the chain 61c via the connecting means 64 is directed toward the mold attachment part 21. drive. At the start of this running, the rod member 64a and the spring receiver, which are provided so as to be able to move together with the chain 61C, are moved to the member 6.
4d immediately starts moving, while the end member 64b integral with the running body 63, which is engaged with the mold 30 via the mold catching means 67, the conical part 640, etc., remain stationary for a while.J:
(The rod member 64a side and the cylindrical part) A 64
The spring 64c interposed between the c sides is compressed. As a result, the tension 'f1' applied to the chain 61C at the start of running is absorbed by this relative movement, and no unreasonable force is applied to the chain 61c. Then chain 6
When the compression of the spring 64e progresses with the movement of 1c, the rond portion +A 64 a
The side and the cylindrical member 64c side are substantially connected, and the cylindrical member 64c etc. also start moving in the same direction, and as a result, the traveling body 63 integrated with the connecting means 64 via the connecting plate 64 (), and therefore the transport The conveyance of the mold 30 engaged with the traveling body 63 is started via the means 66 and the mold capturing means 67.
When the chain 61C1 connecting means 64 and the traveling body 63 are integrally running steadily, both coil springs 64e, 6
4 is balanced, and the constituent members of the connecting means 64 take approximately the same positional relationship as in FIG.

As the traveling body 63 travels, the mold 30 is guided by the guide member 53 over the roller row 52, then over the roller row 24 on the side of the injection molding +120, and then over the roller row of the mold clamping device 70. Slide on 71, mold attachment part 21
It will be transported to When the mold 30 reaches the mold mounting position (FIG. 9), the dimensions of the mold are slightly smaller than the distance between the fixed plate 22 and the movable plate 23, so the fixed plate 22 and the movable plate 23
3 and comes into contact with a stopper 23a provided on the mold mounting portion 21, and a limit switch (not shown) attached to the stopper 23a is activated. When this unloading is stopped, the integral traveling body 6 is attached to the mold 30 via the mold catching means 67.
3, the end member 64b, the cylindrical member 64c, etc. that are integrated therewith immediately stop running, but even if the chain 61c stops the motor 61 immediately, there is a time delay until the chain 61c stops running due to the inertia of the motor 61. . However, even if the chain 61C runs during this time, the rod member 64a integrated with the chain 61c can run while compressing the spring 64e, and the impact is absorbed, so that no unreasonable force is applied to the chain 61c.

Upon receiving the mold unloading end detection output from the limit switch, the control device operates each air cylinder 74 of the mold clamp \i@70. As the cylinder rod 74a of the air cylinder 74 moves forward, the clamp member 7G connected to the door 4a via the connecting member 75 moves toward the guide block 7.
3 in the guide hole 73b, and the wedge-shaped engagement portion of the mold 30 (partially shown as 32b in the figure) at the tip inclined surface 76a. The same applies hereinafter.

) is pressed against the opposite inclined surface. As a result, the large diameter portions 31a of the fixed mold 31 and the movable mold 32.

32a is supported in the height direction by the roller row 71 of the clamp device 70 and is gripped by the clamp member 76, and the large diameter portions 31a and 32a are fixed by the wedge action acting between the clamp member 76 and the wedge-shaped portion 321). Board 2
2 and the movable platen 23, the fixed side mold 3
1 and the movable side mold 32 are fixed to the fixed platen 22 and the movable platen 23 by ¥i, respectively. Next, the air cylinder 65 of the conveying means 66 is driven backward, and the cylinder rod 65a (u
W, the mold capturing means 67 rotates clockwise around the bottle 66a, and its notch 67b separates from the engaging arms 31a', 32a' of the mold 30 (Fig. 9), injection molding. The machine 20 reaches a retreat position that does not interfere with the mold closing and mold opening operations.

After that, when the injection molding cycle using the mold 30 of the injection molding g120 is finished, the mold clamping device is returned to the mold closing position, and the air cylinder 65 is driven forward to move the engagement arm 31 of the mold 30.
a', 32a' are engaged with the mold capturing means 67. Next, each air cylinder 74 of the mold clamp device 70 is
The clamp part 4 is activated and is integrated with the cylinder door 4a.
476 retreats within the guide hole 73b of the guide block 73, and its tip inclined surface 76a separates from the opposing inclined surface of the wedge-shaped engagement member 32b of the mold 30, and the mold 30 is removed from the mold mounting portion 21. be done. Next, the motor 61 is driven in the reverse direction, and the connecting means 64. is connected to the chain 61c driven by the motor 61. Running body 63. The mold 30 connected via the conveying means 66 and the mold capturing means 67 is moved to the rotary table 50.
The mold is carried toward the mold mounting section 51. At the start of this import,
As before, the tensile impact force applied to the connecting means 64 is absorbed by the spring 64 of the connecting means 64 and the chain 61
No shock is applied to c. The mold 30 is driven by the conveyance device 60 and is moved by the roller row 7 of the mold clamp device 70.
1. Roller row 24 on the side of the IPJ injection molding 20. Then, it is transferred over the roller row 52 of the conveyance path, reaches the mold placement part 51, and comes into contact with the inner stopper 55, and when the stopper 55 is attached or the Mitsuru switch is activated, the motor 61 is stopped. .

The impact applied to the connecting means 64 at the end of this conveyance is
No. 4 spring 64fk:J: is absorbed, so no unreasonable force is applied to the chain 61c.

Then, the air cylinder 45 is driven backward in response to the carry-in completion detection output from the limit switch, and the rotation stopper 46 integrated with the cylinder rod 45a moves downward in the guide hole 4a of the guide member 44, and the rotary table 50 The mold 30 is separated from the conical hole 57 and can be rotated for the next selection of the mold 30. At the same time, at 111, as the rotation stopper 46 moves downward, the link 47' whose inner end was in contact with the stopper 46 is released and rotates clockwise in FIG. 3 by the spring force of the tension spring 48. and the link 47'
A mold stopper 58 connected via a link 47 is biased by the spring force of the tension spring 48 and protrudes upward from the upper surface of the roller row 52, thereby stopping the outside of the mold 30 carried into the mold @ storage section 51. to prevent the mold 30 from coming off. As a result, the automatic replacement work of the mold 30 is completed.

Although the above embodiment describes automatic mold exchange in an injection molding machine, the present invention is not limited thereto and can be applied to various devices.

Effects of the Invention When carrying a mold into an injection molding machine, and when carrying a mold from an injection molding machine to a mold mounting table of a mold changing machine,
Since the force from the drive source is transmitted to the mold via a spring to move the mold, even if the mold is carried in and stopped at a predetermined position with a stopper, etc., the inertia of the drive source etc. Even if a force is applied to move the mold further, this force is absorbed by the spring and no excessive force is applied to the mold transmission, which prevents damage to the mold or transmission. This can significantly shorten the life of the mold and mold exchanger.

[Brief explanation of drawings]

FIG. 1 shows a J-hole 4 equipped with a connecting device according to an embodiment of the present invention.
Partial cross-sectional side view showing an automatic mold exchanger for a molding machine, Part 2
The figure is a plan view showing the rotary table, Figures 3 and 4 are an enlarged side view and a partially cross-sectional end view showing the interlocking structure of the rotation stopper and the mold stopper, and Figure 5 is a partial cross-sectional view of the chain. FIG. 6 is a partially enlarged cross-sectional view showing a connecting device, and FIG. 6 is a connecting S;! according to an embodiment of the present invention. 7 and 8 are partially sectional enlarged side views and partially enlarged front views of the mold clamping device, and FIG. 9 is a partially sectional enlarged side view showing the neck, and FIG. It is a diagram. 10... Automatic mold exchange machine, 20... Injection molding machine, 2
DESCRIPTION OF SYMBOLS 1... Mold mounting part, 22... Fixed plate, 23... Movable plate, 23a... Stopper, 30... Mold, 31...
・・Fixed side mold, 32 ・・Movable side mold, 31a, 32
a... gold"? large diameter portions, 31a', 32a'...
Engagement arm portion, 32b... wedge-shaped engagement member, 40...
Rotating table device, 41... Base, 42... Motor, 44... Guide member, 45... Air cylinder, 4
6...Rotation stopper, 47.47'...Link,
48...Tension spring, 50...Rotary table, 51...Mold placement part, 52...Roller row, 55...
... Inner stopper, 56... Guide hole, 57... Conical hole, 58... Mold stopper, 60... Conveyance device, 61... Motor, 61c... Die, 63...
- Traveling body, 64... Connection means, 64a... Rod member, 64b... End member, 64c... Hollow cylindrical member,
64d...Spring receiver C member, 64e, 64f...
Spring, 65...Air cylinder, 66...Transporting means, 67...Mold capturing means, 70...Mold clamping device, 72.72'...Mold supporting member, 73...
・Guide block, 73b...Guide hole, 74...
Air cylinder, 75... Connector, 76... Clamp member, 76a... Inclined surface, 80... Four frames. Figure 2 Figure 4 Figure 6 Figure 7

Claims (3)

[Claims] (1) An automatic mold that automatically transports the mold between the mold mounting section located on the side of the injection molding machine and the mold mounting section of the injection molding machine, and automatically replaces the mold. A mold conveying device in an automatic mold changing machine, in which force from a drive source for moving the mold is transmitted to the mold via a spring. (2) Claim 1, further comprising a transmission means that reciprocates due to the operation of the drive source, and a conveyance means that is connected to the transmission means via a spring, engages with the mold, and moves the mold. Mold transport device in automatic mold changer. (3) The transmission is a chain driven by a motor, and a rod member to which a spring bearing member is fixed is fixed to a part of the chain, and one end of a spring is engaged with both sides of the spring bearing member. 3. The mold conveyance device for an automatic mold changer according to claim 2, wherein the other end of each spring is respectively engaged with the conveyance means.