KR101010406B1 - Injection molding machine for lipstick case leading - Google Patents

Abstract

PURPOSE: A mold device for injecting a lead ring of a lipstick container is provided to completely remove fault since a rotary core is fixed inside the cavity without shaking in case of the application of injection pressure. CONSTITUTION: A mold device for injecting a lead ring of a lipstick container comprises a fixed mold unit(10) and a movable mold unit(11). The multiple rotary cores(16) are installed in the movable mold unit. The rotary core is comprised of a screw core(13) and a bottom core(15) of the upper end. The screw core is located inside the cavity(12). The bottom core has a driven gear(14). The fixed core(18) of the fixed mold unit is assigned to each rotary core. A core driving unit(20) of the movable mold unit is connected through a central gear(19) with the separation and coupling of the molding device.

Description

Injection molding machine for leading ring of lipstick container {Injection molding machine for lipstick case leading}

The present invention relates to a mold apparatus for injection of a lead ring of a lipstick container, and more particularly, to a mold apparatus for injection molding a lead ring for guiding the extraction of a lipstick in a rotary draw-out lipstick container.

In general, lipstick among the various cosmetics necessary for the cosmetic make-up of women is to make up the lip, the contents having a variety of colors are built into the container body is to make up by applying the contents to the lips.

Usually a lipstick container consists of a container body in which the lipstick is accommodated, and a lid covered on the container body to protect the lipstick.

In addition, the container body is provided with a lipstick lifting device for storing and withdrawing the lipstick, the lipstick lifting device is a lipstick lifting holder which is accommodated lipstick, the lid for moving the lipstick lifting holder up and down It consists of a ring or the like, and in particular, the lead ring has a cylindrical shape in which a spiral guide groove is formed on the inner circumferential surface to guide the extraction of the lipstick.

The lead ring of the lipstick container is manufactured by a plastic injection method. In this case, a mold apparatus including an upper fixed core and a lower rotating core is mainly used for injection molding. In general, four sets of fixed molds are used in one mold apparatus. A core and a rotatable core are provided so that four lead rings can be manufactured simultaneously in one injection molding.

However, in the case of a conventional lead ring injection mold apparatus, there are various problems related to the operation of the rotatable core.

First, since the motor and the gear are individually connected to each rotary core, the insertion positions of the respective rotary cores are different from each other in the cavity when the rotary cores are not rotated forward and backward at the same rotation ratio. There is a problem resulting in product defects.

That is, as shown in FIG. 1, a spiral core portion 130 may be located at a side of the resin inlet 110 through which molding resin is injected into the cavity 100 (130 '). '), Other rotatable cores 120 are also located in the spiral groove portion 140 (' B ').

In this case, since the conditions injected into the cavity from the resin inlet side are different from each other, there is a problem in that a quality (thickness, etc.) of a molded article (lead ring) injected in each cavity is not constant.

In addition, since there is no separate structure supporting each of the rotating cores in the related art, even when the rotating core is placed in a desired initial position inside the cavity, the position of the rotating core is changed by external force such as injection pressure during the process. There is a problem that the desired quality cannot be obtained.

Accordingly, the present invention has been made in view of the above, by combining four rotary cores positioned in a rectangular configuration and one center gear positioned in the center thereof, a plurality of rotary cores always have the same rotation ratio. By implementing a new type of core operation method that allows forward and reverse rotation, the lid of the lipstick container can secure a certain quality of the molded product, such that the insertion position of each rotatable core is always kept in the same cavity. The object is to provide a die injection molding apparatus.

In addition, another object of the present invention is to maintain the initial position of the rotary core located inside the cavity even when the external force such as injection pressure by using the binding structure between the four rotary core and one center gear, Accordingly, there is provided a mold apparatus for lead ring injection of a lipstick container which can completely eliminate a problem of poor quality of a molded article.

In order to achieve the above object, a mold apparatus for lead injection of a lipstick container provided in the present invention includes a fixed mold portion and a movable mold portion, while the movable mold portion includes an upper screw core and a driven gear located inside the cavity. At the same time, a plurality of rotary cores consisting of a lower core having a lower end is installed, and the fixed mold unit has a cavity communicating with a resin inlet, and a fixed core that is assigned to each of the rotary cores is installed one by one. A core drive unit is installed to rotate the cores in the forward and reverse directions at the same rotation rate while operating in conjunction with the separating and joining operations of the mold apparatus by using the center gears engaged with the driven gears of each rotating core. Structure, the insertion position of each rotatable core is kept constant in the cavity Number, and is characterized in that the end quality, such as to maintain constant the quality of the molded article can be produced a uniform molded article excellent.

Here, the core drive unit has a fixed shaft fixed to the movable mold part side while having a spiral groove portion continuous in the axial length direction on the outer circumferential surface, and a center gear is formed on the outer circumferential surface, and along the groove portion of the fixed shaft on the inner circumferential surface. It is preferable to form a helical groove in which a plurality of moving balls are seated in a flowable manner, and include a rotating shaft rotatably formed by a storage and withdrawal operation with a fixed shaft while being installed on the movable mold part side.

In addition, in relation to the transmission structure between the rotatable core and the core driving unit, four rotatable cores are provided in a quadrangular arrangement structure, and the core driving unit is located at the center of the four rotatable cores and through the center gear thereof. It is desirable to configure the toothed transmission at the same time as the driven gears in each rotatable core.

Leading injection mold apparatus of the lipstick container provided by the present invention has the following advantages.

First, since a plurality of rotary cores are always rotated forward and backward at the same rotation ratio by one core driving unit, each rotary core can always be inserted at the same position in the cavity, and thus, the shape of the molded article (lead ring) Quality can be ensured at all times.

Second, due to the engagement relationship between the center gear of the core driving unit and the driven gear of the rotating core, the initial position of the rotating core can be maintained without shaking even when an external force such as injection pressure is applied. Productivity can be further increased by completely eliminating defective problems.

Third, by linking the operation mechanism of the core drive unit for the rotational operation of the rotary core with the separation operation of the mold apparatus, the overall structure of the mold apparatus can be simplified by eliminating a separate driving means such as a motor. The cost of manufacturing can also be reduced.

1 is an enlarged view showing a rotational core insertion position in a cavity in a conventional lead ring injection mold apparatus;
Figure 2 is a cross-sectional view showing a lead ring injection mold apparatus according to an embodiment of the present invention
Figure 3 is a plan view showing the relationship between the center gear of the core drive unit and the driven gear of the rotary core in the lead ring injection mold apparatus according to an embodiment of the present invention
Figure 4a, 4b is a perspective view showing a rotatable core and a fixed core in the lead ring injection mold apparatus according to an embodiment of the present invention
Figure 5a, 5b is a perspective view showing the core drive in the lead ring injection mold apparatus according to an embodiment of the present invention
6A, 6B, and 6C are cross-sectional views illustrating an operating state of a lead ring injection mold apparatus according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view showing a lead ring injection mold apparatus according to an embodiment of the present invention, Figure 3 is a center gear and a rotary core of the core drive in the lead ring injection mold apparatus according to an embodiment of the present invention It is a top view which shows the arrangement relationship between driven gears.

As shown in Figures 2 and 3, the lead ring injection mold apparatus has a plurality of rotary cores, for example, four rotary cores positioned in a rectangular arrangement structure is meshed by one core drive unit By including a plurality of rotary cores, it is possible to always forward and reverse rotation at the same rotation ratio.

Therefore, since each rotatable core rotates forward and backward at the same rotation ratio, the quality of the molded article to be injected can be kept constant at all times.

To this end, the lead injection mold apparatus is provided with a fixed mold portion 10 and a movable mold portion 11 that can be separated (released) and combined (joined) with each other, and the fixed mold portion 10 is an upper fixing plate ( 26), the upper disk 27 is made of a laminated structure in order, the movable mold portion 11 is a stripper plate 25, the lower plate 28, the support plate 29, the spacer 30 and the lower fixing plate It consists of a structure in which the 31 is laminated in order.

Here, since the coupling relationship between the plate members constituting the fixed mold unit 10 and the movable mold unit 11 is similar to a general mold apparatus, a detailed description thereof will be omitted.

In addition, a guide pin 32 and an oil bush 33 are provided to guide the separation and coupling operation between the fixed mold unit 10 and the movable mold unit 11, and the guide pin 32 is a movable mold unit. On the (11) side, the oil bush 33 is respectively installed on the fixed mold portion 10 side, and slide binding to each other to guide the separation and coupling operation between the mold portion.

In particular, in the case of the stripper plate 25 in the movable mold portion 11 serves as an ejector during the separation operation of the mold apparatus, there is an advantage that can be excluded additional means such as a separate ejector pin.

For example, the movable mold unit 11 includes a stripper plate 25 which serves as an ejector for product separation, wherein the stripper plate 25 is raised in association with a separation operation of the mold apparatus. At the time of coupling, the elevating device 41 for ejecting and operating can move up and down.

At this time, the ejector elevating device 41 is installed while passing through the lower plate 28 and the support plate 29 in the movable mold portion 11, the upper and lower shaft 40a is coupled to the stripper plate 25 And a lifting block 41c positioned between the supporting plate 29 and the lower fixing plate 31 in the movable mold part 11 and holding the lower end of the lifting shaft 41a, that is, engaged with the lower end of the lifting shaft 41a. ) And a spring 41b for connecting both ends between the bottom of the support plate 29 in the movable mold part 11 and the lifting block 41c to elastically support the lifting block 41c.

Thereby, the movable mold part 11 is isolate | separated from the stationary mold part 10, and the stripper plate 25, the lifting shaft 41a, and the lifting block 41c whole are provided in the outer side of the movable mold part 11 It is connected to the axis (not shown) of the actuator, such as the inlet cylinder, and ascends upward when the axis rises due to the operation of the actuator, and eventually the molded product can be separated from the rotary core 16 according to the operation state described later.

In addition, the stationary core 18 and the rotary core 16 are provided as a means for molding the molded article (lead ring), and the stationary core 18 at this time is located on the stationary mold part 10 side, that is, the upper disc ( It is provided in a structure fixed on the 27, the rotary core 16 is installed on the movable mold portion 11 side, that is, a structure supported over the lower plate 28 and the support plate 29.

At this time, the rotatable core 16 is installed in a structure supported by a plurality of bearings, and is rotatable about its own axis, and the cavity 12 is formed inside the stationary core 18. The cavity 12 has a structure in communication with the resin inlet 17 extending from the resin passage 34.

Here, the resin passage 34 is seated in the lower surface of the upper disk 27 of the fixing mold 10 and the upper surface of the sputter plate 25, more precisely inside the groove 35 in the stripper plate 25. It can be formed between the upper surface of the stripper core 36 of the plate shape to be assembled.

This stationary core 18 and the rotatable core 16 are shown in detail in FIGS. 4A and 4B.

The fixed core 18 is formed in a cylindrical block shape, the upper end portion is coupled to the cap 37 for closing one side of the cavity 12, the lower end one side or both sides of the resin inlet 17 is formed in the cavity ( The side 12 and the resin passage 34 can communicate with each other.

In addition, a positioning projection 38 is formed at the center of the bottom of the cap 37 and in contact with the inside of the cavity 12. The positioning projection 38 at this time is used for positioning described below. Having a fitting relationship with the groove 39 can serve to hold the correct position of the rotatable core (16).

The rotatable core 16 has a shape in which two cores are assembled vertically in the longitudinal direction, for example, a screw core 13 and a lower portion inserted into the cavity 12 in the stationary core 18. The disk 28 and the support plate 29 are configured in a form in which a cylindrical lower core 15 supported by a bearing is bolted together.

In addition, driven gears 14 are concentrically coupled to the outer circumferential surface of the lower core 15 of the rotatable core 16, wherein the driven gears 14 are the central gears 19 of the core driving unit 20. It may be in a state of being always engaged, and the rotation of the rotatable core 16 is achieved by the engagement transmission action between the center gear 19 and the driven gear 14.

In addition, a positioning groove 39 is formed at the center of the upper surface of the screw core 13 of the rotatable core 16, and the screw core 13 is completely inside the cavity 12 of the stationary core 18. When inserted, the positioning projection 38 in the cap 37 of the stationary core 18 is fitted into the positioning groove 39, so that the screw core 13 is in the correct position, that is, The rotatable core 16 can be held in position.

In particular, the present invention provides a core drive unit 20, which is a means capable of simultaneously rotating the plurality of rotating cores 16 at the same rotation ratio.

The core drive unit 20 is a means for rotating each of the rotary cores 16 through a gearing transmission method while being positioned at the center of each of the rotary cores 16, in association with the separation and coupling operation of the mold apparatus. It has a drive mechanism which is operated, in particular associated with an ejecting operation for separating the part.

To this end, as shown in FIGS. 5A and 5B, the core driving unit 20 is movable with the fixed shaft 22 installed in a structure in which the head portion is fixed to the stripper plate 25 of the movable mold unit 11. It consists of a rotating shaft 24 installed in a rotatable structure via a bearing over the lower plate 28 and the support plate 29 of the mold portion 11.

The fixed shaft 22 is a means for inducing the rotational operation of the rotary shaft 24, the outer peripheral surface is formed with a spiral groove portion 21a continuous in the longitudinal direction of the shaft, the flat portion in the head portion It is arranged in such a way that it is fixedly supported in the groove of the stripper plate 25 and extends downwardly to the movable mold part 11 side using the 40.

The rotating shaft 24 is a means for rotating through the helical groove portion 21a in the fixed shaft 22, a cylindrical member having a central gear 19 formed in the middle of the length of the outer peripheral surface, and the inner side of the cylindrical member. Combination of a cylindrical member having a spiral groove portion 21b in which a plurality of balls 23 moving along the groove portion 21a of the fixed shaft 22 are seated on the inner circumferential surface while being integrally coupled in a concentric manner. In the form of

At this time, the inner and outer two cylindrical members can be formed integrally by welding or the like.

Accordingly, the rotary shaft 24 is fitted along the fixed shaft 22 via the balls 23 between the spiral grooves 21a and 21b, and ejecting, for example, ejecting the mold apparatus. Since the rotating shaft 24 is moved by using the flow of the balls 23 between the rotating shaft 24 and the fixed shaft 22 when the mold apparatus is coupled after the ejection and ejection, the rotating shaft 24 is fixed in place. The fixed shaft 22 is rotated about the center axis, and the rotation of the center gear 19 according to the rotation of the rotary shaft 24 leads to the rotation of the driven gear 14 meshed with the rotary core 16. ) Can be rotated.

That is, the rotary shaft 24 may be rotated by the helical movement of the balls 23 moving along the grooves 21a and 21b during the storage and withdrawal operation between the fixed shaft 22 and the rotary shaft 24. In addition, while the engagement transmission between the center gear 19 and the driven gear 14 is made, the rotatable core 16 can be rotated.

The core driver 20 is located at the center of the plurality of rotatable cores 16, and is located at the center of the four rotatable cores 16, for example, in a quadrangular arrangement. The center gear 19 on the rotation shaft 24 of the 20 is engaged with the driven gears 14 on the four rotary cores 16 at the same time so that the gear transmission is possible.

Accordingly, when the center gear 19 of the center, which is linked with the mold device, rotates during the separation and coupling operation of the mold apparatus, the four driven gears 14 engaged with the mold device also rotate all at the same time. The typical core 16 can always be rotated forward and backward at the same rotation ratio.

In addition, since the four rotary cores 16 can maintain a binding state that is always engaged with the central gear 19 of the center through each driven gear 14, external forces such as injection pressure during the injection process are performed. Even in this case, the initial position of the rotatable core 16 does not change, and thus, it is possible to obtain the advantage that the quality defect of the molded product does not occur.

Therefore, looking at the operating state of the lead ring injection molding apparatus of the present invention configured as described above are as follows.

6A to 6C are cross-sectional views showing an operating state of a mold injection molding apparatus according to an embodiment of the present invention.

As shown in FIG. 6A, the resin supplied through the resin passage 34 in a state in which the stationary mold unit 10 and the movable mold unit 11 are coupled (joined) is provided in the cavity 12 through the resin inlet 17. Is filled inside).

After a predetermined time has elapsed after filling the resin, when the molding is completed with the product, separation (release) of the fixed mold unit 10 and the movable mold unit 11 is performed from this time.

As shown in FIGS. 6B and 6C, when the movable mold part 11 starts to be separated from the fixed mold part 10, the stripper plate 25 operates as an ejector, that is, an ejector elevating device 41. By this, the molded article 200 is separated from the rotary core 16.

For example, as the movable mold part 11 starts to separate, the stripper plate 25 rises, and the molded product 200 starts to exit from the rotary core 16 of the core drive part 20. As the typical core 16 is guided in a spiraling direction through the movement of the balls 23, the rotatable core 16 rotates, thus engaging with and around the central gear 19 of the rotatable core 16. As the driven gears 14 rotate, the screw core 13 of each rotatable core 16 also exits from the molded part 200 while rotating at the same rotation ratio.

At this time, the center gear 19 is rotated forward, the driven gear 14 is reversed.

Next, when the separating operation of the movable mold part 11 is restrained by the stopper (not shown), that is, when the movable mold part 11 moves by the molded article taking distance, the molded article 200 is taken out while falling automatically.

After the product is taken out, the movable mold part 11 and the fixed mold part 10 are coupled again, and even when the mold part is coupled, the rotational core 16 is rotated by the operation of the core driving part 20 as described above. You lose.

At this time, the center gear 19 is reverse rotation, the driven gear 14 is forward rotation.

Thus, when each of the rotatable cores 16 is rotated at the same rotational ratio by one center gear 19 when the movable mold unit 11 and the stationary mold unit 10 are coupled together, they are inserted into the corresponding cavity 12. The positions of each of the rotatable cores 16 can be the same position.

In this way, as a plurality of rotating cores are meshed to one center gear, the plurality of rotating cores can always be rotated forward and backward at the same rotation ratio, so that each rotating core is inserted all the same in the corresponding cavity. Since it has a position, it is possible to ensure a constant quality of the molded article injected in each cavity.

10: fixed mold portion 11: movable mold portion
12: cavity 13: screw core
14: driven gear 15: lower core
16: rotating core 17: resin inlet
18: fixed core 19: center gear
20: core drive portion 21a, 21b: groove portion
22: fixed shaft 23: ball
24: rotating shaft 25: stripper plate
26: upper fixing plate 27: upper disk
28: lower plate 29: support plate
30 spacer 31 lower fixing plate
32: guide pin 33: oil bush
34: resin passage 35: groove
36: stripper core 37: cap
38: positioning projection 39: positioning groove
40: flat part 41: elevating device for ejector

Claims (4)

In the mold apparatus for lead ring injection of the lipstick container,
A fixed mold part 10 and a movable mold part 11 are included, and the movable mold part 11 has a lower end having a screw core 13 and a driven gear 14 at an upper end located inside the cavity 12. Each of the rotating cores 16 is provided with a plurality of rotating cores 16 formed of the lower cores 15 and having a cavity 12 communicating with the resin inlet 17 at the same time. Fixed cores 18 are arranged one by one, and the movable mold part 11 uses a central gear 19 to be engaged with the driven gears 14 of each of the rotary cores 16 at the same time. A mold apparatus for lead ring injection of a lipstick container, characterized in that a core drive unit 20 is installed while operating in association with a separation and coupling operation to rotate a plurality of rotatable cores 16 at the same rotation ratio.
The fixed shaft 22 which is fixed to the movable mold part 11 side and has a spiral groove part 21a continuous along the axial length direction on the outer peripheral surface, The central gear 19 is formed and a spiral groove 21b is formed on the inner circumferential surface of which a plurality of balls 23 moving along the groove 21a of the fixed shaft 22 are seated to be movable. Molding apparatus for the lead ring injection of the lipstick container, characterized in that the rotating shaft 24 is rotatably formed by the storage and withdrawal operation with the fixed shaft 22 while being installed on the mold portion (11) side. The center gear of claim 1 or 2, wherein the rotatable core 16 is provided in a quadrangular arrangement with four rotatable cores 16, and the core driving unit 20 is positioned at the center of the four rotatable cores 16. A mold apparatus for lead injection injection of a lipstick container, characterized in that through (19) simultaneous engagement transmission with the driven gears (14) in each rotatable core (16).
The method according to claim 1, wherein the movable mold portion 11 includes a stripper plate 25 to serve as an ejector for product separation, the stripper plate 25 is a lower plate 28 in the movable mold portion 11 Installed between the support plate (29) and the support plate (29) and the lower fixing plate (31) in the movable mold part (11) and the movable shaft (11a), which are installed while penetrating through the support plate (29) and the upper end thereof are coupled to the stripper plate (25). The lifting device 41 for ejector, which is elastically supported by the spring 41b and is constituted by an elevating block 41c for holding the lower end of the elevating shaft 41a, allows the product to be separated during the mold separation operation. Leading injection mold apparatus of the lipstick container characterized in that.

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