JPH0546902Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a device for discharging molded products, etc. between molds, which reliably discharges molded products, runners, etc. out of the mold during molding of synthetic resin.

[Prior Art] A horizontal injection molding machine is equipped with a molded product ejection device, which releases the molded product and discharges it into a mold. In addition, in a three-plate mold, the mold opening force is used to apply an impact to the runner stripper plate (hereinafter referred to as the runner plate), thereby releasing the runner from the runner plate and separating it from the opened fixed side mold. The runner is discharged between the runner plate and dropped outside the mold.

However, in any of these cases, the molded product may remain between the molds, which not only obstructs the mold clamping for the next molding and makes it impossible to close the mold, but also causes damage to the mold. It may happen.

Therefore, various devices have been developed to ensure the ejection of molded products and runners, but most of them have a structure in which the molded products and the like are dropped using an air cylinder.

[Problems to be solved by the invention] For this reason, an air actuation device must be provided in addition to the hydraulic actuation device of the injection molding machine, and the operation of the air cylinder must be related to the opening/closing operation of the mold. have troublesome problems.

This idea was devised to solve the problem of ejection devices operated by other power, and
The purpose of this is to use the opening and closing force of the mold to operate the ejection device, but the purpose is to create a new system that can mechanically operate the ejection device after opening the mold to reliably eject the molded product, etc. from the mold. The goal is to provide a device that is

[Means for solving the problem] The feature of this invention for achieving the above object is that it comprises a rotating shaft which has a large pinion and a small pinion having a tangential notch formed on part of the tooth surface coaxially and which is supported on the upper part of a base plate with a required distance therebetween, an ejection rack which meshes with the large pinion and is provided perpendicular to the base plate, a rack member of a required length which has teeth from the middle to the tip which mesh with the small pinion and is provided between the base plate and the small pinion at right angles to the rotating shaft, and a member which is provided in the toothless portion of the rack member and which fits into the notch of the small pinion to prevent rotation of the small pinion, the rack member is attached to the upper part of one of the dies which open and close the base plate, and the small pinion is provided on the rack member, and the ejection rack is positioned so that it can freely move in and out vertically between the dies.

In addition, if the mold is a three-plate mold, the ejection rack side is connected to the top of the runner stripper plate via the base plate, and the rack member is connected to the top of the stationary side mold via the support member. It is located in the molded product ejection device between the installed molds.

[Operation] In the above structure, when the mold to which the rack member side is attached moves to open the mold, the rack member also moves together. However, since the teeth are provided from the middle to the tip, the small pinion does not rotate and only the rack moves.

As the mold on the rack member side moves, the gap between it and the mold on the discharge rack side opens, and the rotation prevention member separates from the small pinion, so that the small pinion becomes free. After that, the small pinion comes to mesh with the teeth, and as a result, the large pinion rotates together with the small pinion.

As the large pinion rotates, the ejection rack is fed between the open molds. Before the lower part of this ejection rack reaches a predetermined position, the molded product is ejected on the mold side, and if the molded product remains between the molds, the ejection rack that has been fed to the predetermined position after ejection is The molded product is ejected from the mold.

When the mold is closed, the small pinion rotates first due to the return of the rack member, and the coaxial large pinion also rotates in the opposite direction to return the discharge rack to its original position outside the mold. The mold moves further in the mold closing direction, but at this time the small pinion disengages from the teeth and does not rotate, and the discharge rack does not move any further. Further, since the rotation preventing member returns to its original state together with the rack member, this acts on the small pinion and prevents the large pinion from rotating due to the weight of the ejection rack through the small pinion.

[Example] In the figure, 1 is a molded product discharge device, 2 is a fixed mold, 3 is a movable mold, 4 is a fixed platen, and 5 is a movable platen.

The ejecting device 1 has a rotating shaft 9 having a large pinion 6 and a small pinion 8 having a notch 7 tangentially formed on a part of the tooth surface, supported on the top of a base plate 10 at a required interval. A discharge rack 12 is inserted into the guide member 11 of the base plate 10, meshed with the large pinion 6, and penetrated perpendicularly to the base plate 10.
and a rack member of a required length, which is provided between the base plate 10 and the small pinion 8 at right angles to the rotating shaft 9, and partially has tooth portions 13a that mesh with the small pinion 8 from the middle to the tip. 13, and a rod-shaped rotation preventing member 14 which is installed in parallel on the toothless portion 13b of the rack member 13 with a space for receiving the small pinion 8.

This rotation preventing member 14 is connected to the notch 7 of the small pinion 8 located in the toothless portion 13b of the rack member 13.
This prevents the small pinion 8 from rotating, and prevents the coaxial large pinion 6 from rotating under the weight of the ejecting rack 12 and preventing the ejecting rack 12 from naturally moving downward. Further, on the inner surface of the discharge rack 12, one end of a drop rod 15 is inserted into one of a plurality of horizontal holes penetrating through the side portion, and the drop rod 15 is further attached with a screw to extend horizontally.

The above-mentioned ejecting device 1 has a discharging rack 11 mounted on a base plate 1.
The rack member 13 is attached to the fixed mold 2 through the support plate 16, and the rack member 13 is attached to the upper part of the movable mold 3 through the support plate 16.

The fixed mold 2 is fixed to the base plate 10 so that the rotating shaft 9 is positioned along the parting surface of the mold. Further, the support plate 16 is fixed to the movable mold 3 while being positioned parallel to the bottom of the base plate 10 so as not to become an obstacle when the mold is closed. The above-mentioned rack member 13 fixes the side end of the toothless portion 13b and is installed horizontally in the mold opening/closing direction.

In the discharge device 1 provided over both the fixed mold 2 and the movable mold 3 as described above, when the movable mold 3 moves to open the mold, the rack member 13 also moves together. However, since the teeth 13a are provided from the middle to the tip, the small pinion does not rotate and only the rack member 13 moves.

As the mold is opened, the space between it and the fixed mold 2 opens, and the rotation preventing member 14 also moves together with the rack member 13 and comes out of the notch 7 of the small pinion 8.
This brings the small pinion 8 into a free state, and then it meshes with the toothed portion 13a and begins to rotate.

When the small pinion 13 rotates clockwise, the large pinion 6 also rotates in the same direction as the rotating shaft 9, and the ejection rack 12 is delivered between the open molds. Before the lower part of this ejection rack 12 reaches a predetermined position, the molded product 17 is ejected on the mold side, and if the molded product 17 remains between the molds, the molded product 17 is ejected to the predetermined position after ejection. The molded product 17 is ejected from the mold by a drop rod 15 on the side of the ejection rack 12.

Next, when the mold is closed, the small pinion 8 rotates first due to the return of the rack member 13, and the coaxial large pinion 6 also rotates in the opposite direction to pull the discharge rack 12 back to its original position outside the mold. The movable mold 3 further moves in the direction of the fixed mold 2, but at this time the small pinion 8 comes off the teeth 13a and does not rotate, and stops with the notch 7 facing upward, so the ejection rack 12 also moves in the direction of the fixed mold 2. I can't move any further. Further, since the rotation preventing member 14 returns to its original state together with the rack member 13, it fits into the notch 7 and prevents the large pinion 6 from rotating due to the weight of the discharge rack 12 via the small pinion 8.

In the above embodiment, the ejection device 1 is attached to the mold, but depending on the case, it may be attached to the fixed platen 4 and the movable platen 5.

The embodiment shown in FIG. 5 is a case where the mold is composed of three plates, in which 21 is a movable side mold, 22
23 is a fixed side mold, 23 is a runner stripper plate, and the runner 24 is formed by the fixed side mold 22 and the runner stripper plate 23.
In order to reliably discharge the mold out of the mold, the rack member 13 is attached to the upper part of the stationary mold 22 with a support plate 16, and the discharge rack 12 side is attached to the runner stripper with the base plate 10. It is attached to the upper part of the plate 23.

In such a case, when the fixed side mold 22 moves in the mold opening direction together with the movable side mold 21, the rack member 13 also moves, and after the mold is opened, the small pinion 8 is moved by the teeth 13a as described above. Rotate.

Also, on the mold side, as usual, there is a tension pin 25 provided between the stationary mold 2 and the runner stripper plate 23, and a movement restriction pin 27 provided between the runner stripper plate 23 and the mold mounting plate 26. The runner 24 is released from the mold and ejected by the movement and impact of the plate caused by the interaction of The runner 24 is removed from the mold by the discharge rack 12 sent out between the molds.

[Effects of the invention] As described above, two sets of pinion racks are combined vertically and horizontally with the same rotation axis, and the horizontal pinion racks are provided separately in molds that open and close. The vertical pinion is rotated by the horizontal pinion that rotates each time it is opened and closed, and the vertical rack is sent between the molds, allowing molded products, runners, etc. remaining between the molds to be discharged from the mold. Because of this, unlike when evacuation is performed using an air cylinder, there is no need to provide any incidental equipment other than the ejection device.

Furthermore, since the toothless portion 13b is provided on the rack member 13 located in the lateral direction, and the small pinion 8 is meshed after the toothless portion 13b has passed,
During this period, the ejection rack 12 located vertically is not operated, and therefore, when the ejection rack 12 is fed by the large vertical pinion 6 rotating together with the small pinion 8, there is no mold on the lower side.
There is no need to provide a timing space between the ejection rack and the mold, and the stroke of the ejection rack can be shortened.

In addition, the diameters of the two pinions are made different, and the ejection rack 12 is engaged with the large pinion 6, so that the amount of movement of the ejection rack 12 is greater than the amount of movement of the rack member 13. move quickly and sufficiently, even if the range of
Molded products, etc. can be reliably discharged from the mold.

Furthermore, a member 14 is provided in the toothless portion 13b of the rack member 13 to engage with the tangential notch 7 formed on a part of the tooth surface of the small pinion 8 to prevent rotation of the small pinion 8. Therefore, even if the small pinion 8 moves from the toothed part 13 to the toothless part 13b and is disengaged from the toothed part, it will not be in a free state. Due to its own weight, both pinions rotate in the opposite direction, allowing the ejection rack to move naturally without damaging the mold.

[Brief explanation of the drawing]

The drawings show an embodiment of the device for discharging molded products between molds according to this invention. Figure 1 is a side view when the mold is closed, Figure 2 is a plan view thereof, and Figure 3 is a side view when the mold is open. 4 is a front view of the movable mold side, and FIG. 5 is a side view of another embodiment when the mold is opened. 1... Discharge device, 2... Fixed mold, 3... Movable mold, 6... Large pinion, 7... Notch, 8...
Small pinion, 9...rotating shaft, 10...base plate, 12
...Ejection rack, 13...Rack member, 14...
... Rotation prevention member, 15 ... Brushing rod, 16 ... Support plate, 17 ... Molded product, 22 ... Fixed side mold, 23
...Runner stripper plate, 24...Runner.

Claims (1)

[Claims for Utility Model Registration] (1) A large pinion and a small pinion with a notch tangentially formed on a part of the tooth surface are coaxially supported and supported at a required distance above the base plate. a rotating shaft that engages with the large pinion and is provided perpendicularly to the base plate; a toothed portion that engages with the small pinion is partially provided from the middle to the tip; A rack member having a required length and provided at right angles between the base plate and the small pinion; and a rack member provided in the toothless portion of the rack member that fits into the notch of the small pinion to prevent rotation of the small pinion. The rack member is attached to the upper part of one of the molds for opening and closing the base plate, and the rack member is attached to the upper part of the other mold, and a small pinion is provided on the rack member, and a discharge rack is installed. A device for discharging molded products, etc. between molds, characterized in that it is located between the molds so that it can move up and down. (2) In the device for discharging molded products between molds as described in paragraph 1, the mold consists of a three-plate mold including a fixed side mold, a movable side mold, and a runner stripper plate. Attach the above-mentioned base plate to the upper part of the plate, attach the above-mentioned rack member to the upper part of the fixed side mold, provide a small pinion on the rack member, and connect the discharge rack between the runner stripper plate and the fixed side mold. A device for discharging molded products, etc. between molds, characterized by being located between the molds so as to be able to move in and out vertically.