JPH10329178A - Injection molded product removal device - Google Patents

Abstract

(57) [Problem] To provide an inexpensive injection-molded-product taking-out device which has the lightest and simplest structure, and which is driven by a motor to suppress small vibrations. An elliptical motion or a linear motion is performed by motor driving using a planetary gear mechanism (open belt mechanism), and a simple vibration (a pendulum) obtained from the rotary motion is virtually stopped at both ends (a take-out position and an open position). The feature is that the impact is small because it is a mechanism that generates, and the take-out speed can be increased because it is a simple mechanism that causes little wear and damage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection device for removing a work (synthetic resin molded product) injection-molded from a mold.

[0002]

2. Description of the Related Art Various types of injection molded product taking-out devices, such as a swing type and a lateral running type, have been put into practical use. Many have been put to practical use. In the swing-type injection-molded product removal device, a main cylinder with a chuck for gripping a workpiece is rotatably arranged at the tip of a cylinder rod, and the main cylinder is rotated with a swing cylinder to swing the chuck to the neck. Let me pretend,
First, the chuck waits at the original position on the mold with the main cylinder in the vertical state, and when the mold is opened, the cylinder rod of the main cylinder extends, the chuck enters the mold, and grips the runner of the work. When the chuck is lifted, the cylinder for swinging is operated to swing the neck, and then the cylinder rod of the main cylinder is extended to release the work. When the work is released, the cylinder rod of the main cylinder retreats, then the cylinder rod of the swinging cylinder retreats, the main cylinder becomes vertical, and the chuck returns to the original position.

[0003] In other words, one cycle of the swing-type injection molding product take-out apparatus includes the extension of the cylinder rod of the main cylinder, the retraction of the cylinder rod of the main cylinder, the extension of the cylinder rod of the swing cylinder,
It consists of six strokes: extension of the cylinder rod of the main cylinder, retraction of the cylinder rod of the main cylinder, and retraction of the cylinder rod of the swing cylinder.

[0004] In addition, a lateral traveling type injection molding product take-out apparatus also requires two cylinders, a main cylinder for vertically moving a chuck and a traveling cylinder for laterally traveling the main cylinder. It consists of six strokes, as in the case of the type of injection molded product take-out device.

[0005]

As described above, the conventional swing-type or lateral-travel-type injection-molded-product removal apparatus is a conventional type.
There is a problem that the structure is complicated because it requires two air cylinders. In addition, the number of strokes is large, and a very short but pause time is required for switching the sequence between strokes. There is a problem that becomes longer.

[0006] Even if two or one air cylinders are driven, the range of rotation is limited in the air cylinder drive. Further, since two points, ie, the extension dead center and the retraction dead center of the cylinder rod, are used, the two cylinders are driven at both dead centers. Since an impact is generated and the chuck tip vibrates to cause a chucking error, as a countermeasure against the chucking error, the rigidity is increased to make the chuck large and heavy. Therefore, the present invention has been made to eliminate these disadvantages.

[0007]

According to the present invention, there is provided an injection molded product take-out apparatus, comprising: a fixed or movable die plate, a mold, or a base mounted on a lower portion of a molding machine so as to be movable in a mold opening direction by a work drawing stroke. It consists of a main arm with a planetary gear mechanism (open belt mechanism) with a sun gear fixed to the base, and a take-out arm connected to the planetary gears at the center and with a chuck attached to the tip to grip the work. Drive by rotation.

The length from the center of the sun gear of the main arm to the center of the planetary gear and the fulcrum of the take-out arm (center of the planetary gear)
When the length of the center of the chuck portion is the same and the number of teeth of the sun gear and the planetary gear is set to (sun) 2 to 1 (planet), the main arm is turned by 180 ° and the connected take-out arm is also 180 ° The trajectory of the center of the chuck portion performs a linear motion from the take-out position to the open position, and a simple vibration (a pendulum) obtained from the rotational motion causes a virtual stop at both positions, so that no impact is generated. In addition, since the angle of entry of the chuck pawl becomes smaller at the take-out position, no chucking error occurs. By driving the motor to rotate, it can be rotated quickly in accordance with the opening and closing of the mold, and the motor speed can be reduced outside the mold (during molding) to rotate to an arbitrary position and stand by. Since the take-out stroke is four times the arm length, it can be made small and light. The present invention is an injection molded product take-out apparatus having the above-described configuration.

[0009]

Embodiment 1 Hereinafter, the present invention will be specifically described based on an embodiment shown in the drawings. In FIG. 1, the base (1)
Depending on the product to be taken out, it is placed on the fixed / moving die plate of the injection molding machine or below the mold or molding machine, but it can be moved in the mold opening direction by the stroke of pulling the work from the mold by a mechanism not shown. It is attached as follows. The center of the sun gear (5) is held and fixed on the base (1), and the driven gear () is integrally fixed to the axis of the sun gear (5) via the bearing (6) and the main arm (2). 7) is rotatably mounted. That is, the main arm (2)
Is rotatably mounted on the base (1) about the axis of the sun gear (5).

The drive motor (8) is mounted on the base (1) so as to hold and fix the space between the cores. A drive gear (9) is rotatably fixed to the shaft of the drive motor (8), and the rotational force of the drive gear (9) is smoothly transmitted to the driven gear (7). That is, while the main arm (2) and the drive motor (8) are held by the base (1), the rotation of the drive motor (8) is transmitted directly to the rotation of the main arm (2).

A planetary gear (10) and a support shaft (1) are provided at the tip end of a main arm (2) held by the axis of a sun gear (5).
1) and held on the main arm (2) via a bearing (12). A sprocket gear (13) is mounted between the sun gear (5) and the planetary gear (10) at an appropriate "spacing", and is supported via a bearing (14) via a support shaft (15).
And hold it on the main arm (2). Here, by connecting the sun gear (5) and the planetary gear (10) with the connecting gear (13), a planetary gear mechanism is established and smooth rotation transmission can be performed.

A support shaft (1) to which a planetary gear (10) is attached
A take-out arm (3) is fixed to 1), and a chuck (4) holding a runner of a work is provided at a tip of the take-out arm (3).
Is attached. Therefore, the center length of the support shaft (11) from the gripping center of the chuck (4) and the center length of the center from the center of the sun gear (5) to the center of the planetary gear (10) are made the same, and the sun gear ( 5) and the number of teeth of the planetary gear (10) are set to (sun) 2: 1 (planet). Here, the gripping center of the chuck (4), the center of the planetary gear (10), and the center of the sun gear (5) are set in a straight line,
The gripping center of the chuck (4) is rotated to near the center of the sun gear (5), and it is confirmed that the chuck (4) does not interfere even when the mold is closed, and the standby position (p3) is set.

However, if the main arm (2) is
When the mold is closed and injection molding is being performed, the chuck (4) stands by near the mold when the mold is closed, and when the mold is opened, the drive motor (8) rotates at full speed (forward rotation). )
Then, the main arm (2) rotates about the sun gear (5) from the driving gear (9) via the driven gear (7),
When the planetary gear (10) side of the main arm (2) approaches the take-out position (p1), the connecting gear (13) held by the main arm (2) becomes a sun gear ( 5) rotate on the circumference, the rotation is transmitted to the planetary gear (10) in the same direction as the main arm (2),
The rotation direction of the planetary gear (10) rotates in the opposite direction to the direction of the main arm (2), and is increased to twice the rotation angle of the main arm (2).

Therefore, the take-out arm (3) integrated with the planetary gear (10) is increased to a double angle by the rotation opposite to the rotation direction of the main arm (2), and the chuck (4) side is moved to the take-out position (p1). It is turned toward. As the gripping center of the chuck (4) approaches the removal position (p1), the sun gear (5), the planetary gear (10), and the main arm (2).
The relationship between the main arm (2) and the take-out arm (3) is linear while the linear movement is performed based on the theory of the planetary gear mechanism, that is, the gripping center of the chuck (4) is at the take-out position ( The trajectory leading to p1) virtually stops at a simple vibration (pendulum) obtained from the rotational motion. At this time, the work is held by the chuck (4), but the speed of the drive motor is slowed down and the work is stopped instantaneously, so that the work can be more reliably held.

After the chuck (4) grips the work, the base (1) slides until the spool comes out of the mold, from which the main arm (2) continues to rotate in the same direction. The gripping center of the chuck (4) attached to the take-out arm (3) is moved from the take-out position (p1) to the sun gear (5) by passing through the open position ( It moves linearly toward p2). During this time, the mold is closed and molding starts. Further, the speed slows down near the open position (p2) and virtually stops at the open position (p2). After the work of the chuck (4) is delivered or released, the rotation of the drive motor (8) is switched and reversed.

When the drive motor (8) is rotated in the reverse direction, the main arm (2) also rotates in the reverse direction, and the movement of the chuck (4) returns to a straight line so that the sun gear (5) rotates.
It aims to. After passing through the center of the sun gear (5), the main arm (2) and the unloading arm (3) stand by at the start position and the target posture at the standby position (p3) near the closed mold during molding of the molded product. And one cycle is completed. The cover (16) prevents dusting of the gears and reinforces the main arm (2). This trajectory was represented

FIG.

[0017]

[Embodiment 2]

FIG. 6 shows a sun gear (5) and a planetary gear (10) as shown in an embodiment of FIG.
Is changed to (sun) 1.5 to 1 (planet), and the center distance of the support shaft (11) reaches the center of the mold from the gripping center of the chuck (4) as shown in the figure. And the center-to-center length from the center of the sun gear (5) to the center of the planetary gear (10) is set to a length that does not interfere with the tie bar and the mold. The gripping center of the chuck (4) is rotated to near the center of the sun gear (5), and the standby position (p3) is set so that the chuck (4) does not interfere even when the mold is closed.

However, if the main arm (2) is 25
When the mold is closed and injection molding is being performed, the chuck (4) stands by near the mold, and when the mold is opened, the drive motor (8) rotates at full speed (positive rotation). rotation)
Then, the main arm (2) rotates about the sun gear (5) from the driving gear (9) via the driven gear (7),
When the planetary gear (10) side of the main arm (2) approaches the take-out position (p1), the connecting gear (13) held by the main arm (2) becomes a sun gear ( 5) rotate on the circumference, the rotation is transmitted to the planetary gear (10) in the same direction as the main arm (2),
The rotation direction of the planetary gear (10) rotates in the direction opposite to the direction of the main arm (2), and is increased to 1.5 times the rotation angle of the main arm (2) and rotates.

Therefore, the take-out arm (3) integral with the planetary gear (10) is increased to 1.5 times the angle in the direction opposite to the rotation direction of the main arm (2), and the chuck (4) side is taken out at the take-out position (p1). ). As the gripping center of the chuck (4) approaches the take-out position (p1), the relationship between the sun gear (5) and the planetary gear (10) and the relationship between the main arm (2) and the take-out arm (3) is based on the theory of the planetary gear mechanism. When the main arm (2) and the take-out arm (3) become wide-angle while performing the elliptical motion based on the above, the trajectory when the gripping center of the chuck (4) reaches the take-out position (p1) changes from the elliptical motion to the elliptical portion. The workpiece is easily gripped by the damping. At this time, the chuck (4) grips the workpiece. In addition, the speed of the driving motor is slowed down and the workpiece is stopped instantaneously, so that the workpiece can be gripped more securely.

After the chuck (4) grips the work, the drive motor enters reverse rotation, and the base (1) slides until the spool comes out of the mold, from which the main arm (2) rotates in the opposite direction. When starting to move, take-out arm (3)
The gripping center of the chuck (4) attached to is moved from the take-out position (p1) toward the sun gear (5) by elliptical motion while passing through the opening position (p) while increasing the speed.
Move in an ellipse toward 2). During this time, the mold is closed and molding starts. Further, the speed slows down near the open position (p2) and virtually stops at the open position (p2).
After the work of the chuck (4) is delivered or released, the rotation of the drive motor (8) is switched to make it rotate forward.

When the drive motor (8) is rotated forward, the main arm (2) also rotates in the take-out direction, and the movement of the chuck (4) aims at the sun gear (5) so as to return on an ellipse. After passing through the center of the sun gear (5), the main arm (2) and the take-out arm (3) enter standby at the start position at the standby position (p3) near the closed mold during molding of the molded product. One cycle is completed.

[0022]

As described above, the injection molded product take-out apparatus of the present invention makes use of the characteristics of the planetary gear mechanism with a very simple structure, and has an arm length of about 1 with respect to the distance from the take-out position to the open position. It is made of / 4, and the movement is simple vibration (pendulum)
As a result, the inertia is small because the arm length is within the arm length range, so that speed control and stopping by the drive motor can be easily performed.
It can be freely repeated {or 90}. Then, by attaching a rotation motor of a sun gear separately from the drive motor, a differential gear mechanism can be formed from the planetary gear mechanism, and the free movement of the take-out arm can be obtained. In either the planetary gear mechanism or the open belt mechanism, an approximate straight line or an elliptical locus can be obtained by changing the gear ratio between the sun gear and the planetary gear.

[Brief description of the drawings]

FIG. 1 is a plan sectional view of Embodiment 1 of the present invention.

FIG. 2 is a front view of the first embodiment of the present invention.

FIG. 3 is a side view of the first embodiment of the present invention.

FIG. 4 is a layout diagram of Embodiment 1 of the present invention.

FIG. 5 is a linear locus diagram according to the first embodiment of the present invention.

FIG. 6 is an elliptical locus diagram of Embodiment 2 of the present invention.

[Explanation of symbols]

 1. Base 2. Main arm 3. Removal arm 4. Chuck 5. Sun gear 6. Bearing 7. Driven gear 8. Drive motor 9. Drive gear 10. Planetary gear 11. Support shaft 12. Bearing 13. Joint gear 14. Bearing 15. Support shaft 16. cover

Claims (1)

[Claims] 1. A base mounted to be movable in a mold opening direction by a workpiece pulling stroke at a fixed / movable die plate or a mold of an injection molding machine or a lower part of the molding machine, and a planetary gear having a sun gear fixed to the base. It consists of a main arm with a mechanism (open belt mechanism) and a take-out arm that is connected to the center of the planetary gear and has a chuck attached to the tip to grip or adsorb the work. Adjusting the length of the main arm and the take-out arm When the main arm is turned by the rotation of the motor, the connected take-out arm is turned in the opposite direction, the movement of the chuck portion performs a linear motion from the take-out position to the open position, and The simple vibration (pendulum) obtained from the rotary motion generates a virtual stop at both ends (unloading position, open position), so that there is little impact even at high speed. Injection molded product removal device.