JPS6285919A - Molding remover for injection molding machine - Google Patents

Abstract

PURPOSE:To make the necessary space on the upper side smaller by providing one revolving shaft for shifting upward, downward and laterally on the rectangular-type molding remover. CONSTITUTION:The molding gripper 33 installed at the end of second arm 32 is pivoted under the condition that the pivoting of the end of first arm 29 is shifted horizontally to the downward direction by the length of second arm 32. In other words, the said gripper 33 is pivoted within the radius equivalent to the distance between the first shaft 28 and the second shaft 31 at the tip of second arm 32. The molding product 16 can be removed out of the mold of injection molding machine by combining the pivoting of second arm 32 with shifting of injection molding machine to the longitudinal direction by the longitudinal driving gear 24 on the moving table 21. Since the second arm 32 is positioned always lower than the first arm 29, no components move more upward than the end of first arm when the first arm 29 pivots upward. In other words, a space equivalent to the revolving radius of first arm should be secured on the upper side of the unit, which requires a smaller space to the upper direction than the one required for the existing units.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a molded article take-out machine for an injection molding machine that automatically takes out a molded article from a mold.

(B) Prior Art There are two types of conventional molded product take-out machines for injection molding machines: an orthogonal type molded product take-out machine and a rotating telescopic molded product take-out machine.

The orthogonal molded product take-out machine operates in three orthogonal axes directions (up and down,
The molded product gripping tool is moved linearly in the left-right direction and the surface direction using a pneumatic cylinder, a motor, etc. In other words, a fixed base is attached to the fixed plate of the injection molding machine, a first movable base is provided so as to be movable in the lateral direction of the injection molding machine with respect to the fixed base, and the injection molding machine length is mounted on the first movable base. A second movable base is provided so as to be movable in the hand direction, a shaft movable in the vertical direction is provided on the second movable base, and a molded product gripping tool such as a suction pad is attached to the tip of this shaft. The first movable carriage is driven by a motor, for example via a chain, and the second movable carriage is driven by a pneumatic cylinder', and the shaft on which the molded article gripper is deposited is driven by a pneumatic cylinder. . With such a configuration, the molded product can be taken out from the injection molding machine by moving the molded product gripper in the facing direction, vertical direction, and left and right direction.

The rotating telescopic molded product take-out machine is composed of a rotating shaft disposed in the longitudinal direction of the injection molding machine, and an arm attached to the rotating shaft that is extendable and retractable in the radial direction of the swing and movable in the direction of the rotating shaft. Ru.

(c) Problems to be solved by the invention However, the conventional orthogonal molded product take-out machine as mentioned above has
There are problems in that a large space is required above the molded product removal machine and a high ceiling is required. That is, since the shaft is moved in the vertical direction by a pneumatic cylinder, a rack, a pinion, etc., a space in the height direction is required that is more than twice the −F downward stroke of the shaft from the center of the mold.

In addition, the rotating and telescopic molded product take-out machine also has the problem that the height of the device increases, and in order to place the molded products horizontally on the conveyor, it is necessary to further rotatably support the molded product gripping device. There is a problem. In other words, the pivot shaft needs to be installed above the mold to prevent the molded product from interfering with the tie bars of the injection molding machine when taking out the molded product, and the extension and contraction stroke of the arm is required to convey the molded product to the side of the molding machine. needs to be very large and requires upward space. In addition, the direction of the arm when adhering a molded product attached to the mold of an injection molding machine to the molded product gripping tool and the direction of the arm when releasing the molded product differ only by the rotation angle of the arm. Therefore, molded products cannot be placed horizontally on the conveyor. In order to be able to place the molded product horizontally, it is necessary to make the molded product gripper pivotable about a further axis. For this reason, the rotary telescopic molded product take-out machine can only be used to take out molded products that do not cause problems even if they are dropped onto a conveyor, or sprues, runners, etc. that are generated during molding. The present invention aims to solve the above problems.

(d) Means for solving the problems The present invention solves the above problems by achieving the vertical movement and lateral movement of the conventional orthogonal molded product take-out machine using a single rotating shaft. solve. That is, the molded product take-out machine for an injection molding machine according to the present invention includes a fixed base that is attached to a fixed plate of the injection molding machine, and a fixed base that is movable in the longitudinal direction of the injection molding machine.
／” Handle 1 Stuffy ■ A long-hair direction driving device for crystallizing tuna, a first shaft that is arranged parallel to the direction of movement of the device and rotatably supported on a movable table, and a first shaft that is rotatably supported. a first arm attached to a protruding portion of the first shaft from the movable base so as to rotate together with the first arm; and a second arm rotatably supported at the tip of the first arm.
A second arm is attached to a shaft so as to rotate together with the second shaft, and the second arm is connected to a movable base so that the second shaft does not rotate regardless of the rotation of the first arm. a posture holding mechanism that keeps the direction of the second arm constant; a molded product gripper provided at the tip of the second arm;
have.

(e) Operation When the rotational drive device is operated and the first shaft is rotated approximately 180 degrees, the first arm attached to the first shaft is rotated by the same angle, and the second arm attached to the first arm is rotated by the same angle. rotates together with the first arm while maintaining a constant posture (for example, in the vertical direction) by the posture holding mechanism. The molded product gripper attached to the tip of the second arm rotates while the first arm of the first arm is moved downward in parallel by the length of the second arm. That is, the molded product gripper rotates at the tip position of the second arm using the distance between the first and second shafts as a radius.

By combining the rotation of the second arm with the movement of the movable base in the longitudinal direction of the injection molding machine by the longitudinal direction drive device, the molded product can be taken out from the mold of the injection molding machine. Since the second arm is always located below the first arm, when the first arm rotates upward, there is no member that moves above the tip of the first arm. In other words, it is sufficient to secure a space above the device corresponding to the turning radius of the first arm. Therefore, the space required in the upward direction is reduced.

(F) Embodiments Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 8 of the accompanying drawings.

In this embodiment, the present invention is applied to a horizontal injection molding machine. As shown in FIGS. 1 and 2, a fixed platen 11 is provided on the frame 10 of the injection molding machine, and a movable platen 12 is provided on the frame 10 of the injection molding machine.
is guided by the tie bar 13 and can move toward and away from the fixed P2111. Fixed plate 1
A fixed mold 14 is attached to the movable plate 12, and a movable mold 15 is attached to the movable platen 12. Note that the molded product 16 is left on the movable mold 15 side when the mold is opened. An injection nozzle 17 is provided on the fixed platen 11 side.

A fixed base 20 constituting a molded product take-out machine is fixed to the upper part of the fixed platen 11. A movable base 21 is supported on the fixed base 20 so as to be movable with respect to a rail 23 on the fixed base 20 by a slider 22 provided thereon. Furthermore, as shown in FIG. 2, the movable base 21
It is provided so as to be located substantially above the safety door 19 on the opposite side from the safety door 8. The rail 23 is arranged in the longitudinal direction of the injection molding machine. The movable platform 21 is driven by a longitudinal drive 24 . The orientation drive device 24 includes a motor 25 attached to the fixed base 20, a ball screw configured with a male screw 26 and a nut 27, and the motor 25.
There is a heald pulley mechanism 60 connecting the male screw 26 and the male screw 26. A first shaft 28 is rotatably supported on the movable base 21 and is arranged parallel to the direction of movement of the movable base 21. A first arm 29 is attached to a protrusion from the movable base 21 so as to rotate together with the movable base 21. ing. The first shaft 28 can be rotationally driven by a rotational drive device 30, which will be described later. 1st arm 2
A second shaft 31 parallel to the first shaft 28 is rotatably supported at the tip of the shaft 9 . A second arm 32 is attached to the second shaft 31 so as to rotate together with it. First axis 28
and the second shaft 31 are connected by a posture holding mechanism 44 (see FIG. 3), which will be described later. A molded product gripper 33 is provided at the tip of the second arm 32 .

The molded product gripper 33 has a plate 34 and a suction pad 35 attached to the plate.

The plate 34 supports the pneumatic cylinder 3 with the bin 36 as a fulcrum.
It can be rotated by 7.

FIG. 3 shows the movable base 21 and the first arm 29 in detail.

The aforementioned first shaft 28 is rotatably supported by two bearings 61 relative to the movable base 21. First axis 28
The rotary drive device 30 that rotationally drives the first shaft 28 is composed of a gear 62 provided to rotate together with the first shaft 28, a rack 63 that meshes with the gear 62, and a cylinder 64 that moves the rack 63 in the axial direction. There is. Rack 63 is the fourth
As shown in the figure, it is supported by a slider 35 with respect to the movable base 21. Further, the cylinder 64 is connected to the movable base 21
It is attached by a bin 65 to the holder. In addition,
The cylinder 64 is a two-stage stroke cylinder in which two cylinders 64a and 64b are connected back to back. Also,
The first shaft 28 is connected to a balancer 66 as shown in FIG. That is, the balancer 66 has its cylinder side connected to the movable base 21 by the pin 38, and the rond side connected to the arm 40 integrated with the first shaft 28 by the pin 39. The balancer 66 is supplied with compressed air in a direction that draws the rod 66a into the cylinder, and has a spring 41 that produces a force in the same direction. Stoppers 42 and 43 are provided at both rotation stop positions of the arm 40. The stoppers 42 and 43 with a buffer function are attached to the movable base 21 so that their positions can be adjusted.

A posture holding mechanism 44 is provided inside the first arm 29 as shown in FIG. The posture holding mechanism 44 has a shaft 48
, sprocket 45, chain 46, sprocket 47
It is composed of etc. Sprocket 45 is shaft 48
The shaft 48 has two bearings 4 in the hollow part of the first shaft 28.
9 and is rotatably supported via the first arm 29
It is rotatably supported by a bearing 50. The sprocket 47 is provided to rotate integrally with the second shaft 3 mentioned above. In addition, the second
The shaft 31 has two bearings 51 for the first arm 29.
is rotatably supported by. sprocket 45
The pitch circles of the sprocket 47 and the sprocket 47 are the same.

A chain 46 is wound around sprockets 45 and 47. Incidentally, a portion unnecessary for the engagement of the chain 46 is provided as a lot 52, and the chain 46 is provided with a turnbuckle (not shown). nf1
One end of the shaft 48 mentioned above is fixed to the movable base 21 via an arm 53.

Next, the operation of this embodiment will be explained.

While the injection molding machine is performing injection molding, only the cylinder 64a of the rotary drive device 30 extends the rod.
The first arm 29 is in the state shown in FIG.
The center of the 5th plate 34 is at the 92nd point). Furthermore, the movable base 21 has retreated to a position closer to the injection nozzle 17.

When injection molding is finished and the mold is opened, the cylinder 64
a contracts the rod, the first shaft 28 rotates under the action of the rack 63 and the gear 62, and the first arm 29 pivots to 21 points shown in FIG.

When the first arm 29 is pivoted to the PI point, the center of the plate 34 moves to the Q+ point and coincides with the center of the movable mold 15 (the state shown in FIG. 2). Note that even when the first arm 29 rotates, the second arm 32 always maintains a constant S9+ (vertical orientation in this embodiment). This is due to the action of the posture holding mechanism 44. That is, the second arm 32 includes the second shaft 31, the sprocket 47, and the chain 46.
, the first arm 29 is fixed to the movable base 21 via the sprocket 45, the shaft 48 and the arm 53.
Even if it turns, it does not rotate with respect to the movable base 21. That is, when the first arm 29 turns, the sprocket 4
Since the pitch circles of sprocket 5 and sprocket 47 are the same, sprocket 47 revolves around sprocket 45 but does not rotate.

Next, the movable base 2 is moved by the action of the longitudinal direction drive device 24.
1 moves in the direction of the movable platen 12. This allows pad 35
is attached to the movable mold 15! Adsorb 6. Next, the movable base 21 retreats while adsorbing the molded product 16 (the state shown in FIG. 1).

Next, the first arm 29 is moved by the operation of the cylinder 64a.
turns and reaches the 22 point shown in Figure 6. In this state, the injection molding machine closes the mold for the next molding. When the first arm 29 is in the P1 position, the cylinder 37 is operated to rotate the plate 34 by 90 degrees to a horizontal state. Next, the cylinder 64b is extended to rotate the first arm 29 to the 93rd point as shown by the imaginary line in FIG. Remove the negative pressure and molded product 1.
6 on the conveyor 69 (the state just before this is the 7th
(shown in figure). Next, the cylinder 64b is contracted to rotate the first arm 29 to a point P, and the plate 34 is rotated 90 degrees to become vertical and return to its initial state. The same cycle is repeated thereafter.

As mentioned above, the cylinder 64 for rotating the first arm 29 is of a two-stage type, and when only the cylinder 64a is actuated, the first arm 29 rotates from point 24 to point 22 shown in FIG. However, when the cylinder 64b is operated, the first arm 29 rotates from the 22nd point to the 23rd point.

Also, the stroke of the cylinder 64b is longer than the stroke of the cylinder 64a, and when only the cylinder 64b is operated, the first arm 29 moves from 21 points to 24 points.
6), it can also be stopped at point P4. The position adjustment at the turning end points of the first arm 29, that is, the 21st and 23rd points, is performed by the stopper 42 and the stopper 43.
This is done by adjusting. Since the stopper 42 and the stopper 43 have a buffer function, the first arm 2
9 stops smoothly.

During operation, the balancer 66 described above performs the following actions. When the first arm 29 rotates, the first arm 29 and the second
Although a rotational force acts on the first shaft 28 due to the weight of the arm 32, the molded product gripper 33, the molded product 16, etc., the balancer 6
6 constantly exerts a force through the arm 40 that cancels out this rotational force. That is, as the arm 40 approaches the stopper 42 or the stopper 43, the balancer 66
In addition to increasing the force acting on the arm 40 (the force due to air pressure and the spring 41), the first of that force increases.
The radial component around the shaft 28 increases, and the rotational force acting on the balancer 66 or the 11d128 increases. The rotational force caused by this balancer 66 is almost in balance with the rotational force due to gravity described above. Therefore, regardless of the position of the first arm 29, the rotational driving force of the first shaft 28 by the cylinder 64 is a relatively small and substantially constant force.

Furthermore, even if the air pressure in the cylinder 64 is lost due to a power outage, failure, etc., it is possible to prevent the first arm 29 from dropping suddenly. In the above embodiment, the rotary drive mechanism 30 is of the type using the cylinder 64, but the gear 80 may be driven by a motor 82 with a reduction gear 81 as shown in FIG.

Moreover, although the longitudinal direction drive device 24 is of the type using the motor 25, it can also be of a pneumatic cylinder type.

Although a balancer 66 is provided in this embodiment, it can be removed if the rotary drive device 30 has sufficient driving force. In this case, as shown in FIG. 8, a balance weight 83 may be provided at a position opposite to the center of the first shaft 28 of the first arm 29.

Although the posture holding mechanism 44 is of a type using a chain, a sprocket, etc., it may have other configurations such as a parallel link mechanism, for example. The chain can also be a toothed belt. Furthermore, as shown in FIG. 8, a sprocket 47 may be provided outside the first arm 29, and the sprocket 45 may be directly fixed to the movable base 21. Also,
Arrange two turnbuckles in parallel on the chain 46,
By extending one and contracting the other, the relative positional relationship between the sprocket 45 and the sprocket 47 can be adjusted. This allows the direction of the second arm 32 to be finely adjusted.

Further, although this embodiment applies the present invention to a horizontal injection molding machine, the present invention can also be applied to a vertical injection molding machine.

(g) As described above in detail, according to the present invention, the space required on the upper side of the molded product take-out machine for an injection molding machine can be reduced. That is, it is only necessary to secure the turning radius of the first arm on the upper side, and thereby it is possible to obtain an upward stroke greater than the turning radius of the first arm. FIG. 9 schematically shows that the required upper space is reduced in this way (the solid line represents the present invention, and the broken line represents the conventional example). Also,
The lateral dimensions of the fixing base are also very small.

[Brief explanation of drawings]

FIG. 1 is a side view of a molded product take-out machine for an injection molding machine according to the present invention, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG.
The figure is an enlarged view of the movable table and the first arm, Figure 4 is a sectional view taken along line IV-IV in Figure 3, Figure 5 is v-v in Figure 3,
1! 6 is a diagram showing the molded product take-out machine in operation (showing the standby state), FIG. 7 is a diagram showing the operating state of the molded product gripping tool, and FIG. 8 is a diagram showing another example of the present invention. FIG. 9 is a diagram showing the effect of the present invention in comparison with a conventional example. 20... Fixed base, 21... Movable base, 24... Longitudinal drive device, 28... First axis, 29... First arm, 30... Rotation drive device, 31...・Second axis, 32
...Second arm, 33...Molded product gripping tool, 66...
- Balancer, 44... Posture holding mechanism. Patent Applicant Japan Steel Works Co., Ltd. Agent Patent Attorney Toshiyuki Miyauchi Figure 1 II Page 2 Figure 4 Figure 5

Claims (1)

[Claims] 1. A fixed base attached to a fixed plate of an injection molding machine, a movable base provided on the fixed base so as to be movable in the longitudinal direction of the injection molding machine, and a longitudinal drive device for driving the movable base. , a first shaft arranged parallel to the direction of movement of the movable base and rotatably supported; a rotational drive device for rotationally driving the first shaft; and a protrusion of the first shaft from the movable base. a first arm attached to rotate together with the first arm; a second shaft rotatably supported at the tip of the first arm; and a second arm attached to rotate integrally with the second axis. and a posture holding mechanism that connects the second axis to the movable table to keep the direction of the second arm constant so that the second axis does not rotate regardless of the rotation of the first arm; A molded product take-out machine for an injection molding machine, comprising: a molded product gripper provided therein. 2. The first
A molded product take-out machine for an injection molding machine according to claim 1, further comprising a balancer that applies a rotational force to the shaft. 3. The rotational drive device includes a gear provided to rotate integrally with the first shaft, a rack provided on the movable base so as to mesh with the gear, and a two-step cylinder that reciprocates the rack. A molded product take-out machine for an injection molding machine according to claim 1 or 2.