JPS6237703Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention has a nozzle body with one flow path connected to a molten resin ejection hole, and multiple flow paths that supply multiple types of molten resin of different colors to this flow path. The purpose of this nozzle for mixed color injection molding is to not only produce a beautiful mixed color pattern in which multiple types of molten resin are finely dotted in a two-dimensional direction, but also to The aim is to allow for subtle and wide-ranging changes to be made freely and easily.

The nozzle for mixed color injection molding according to the present invention is arranged such that the nozzle body is provided at a confluence point of the plurality of channels and the single channel of the nozzle main body, or on the upper side in the molten resin supply direction than that, with respect to the flow line direction of the plurality of supply channels. By driving reciprocating movement in the direction of orthogonal or nearly orthogonal axes, or by driving rotation around the orthogonal axes, or by driving rotation around the axis along or almost along the streamline direction of the supply flow path, A member capable of selecting the molten resin to be supplied from the plurality of supply channels to the single channel is provided, and a cylindrical member having the ejection hole is provided at the tip of the nozzle body to connect the single channel and the single channel. It is characterized by being removably attached to the ejection hole to form a space in which a plurality of types of molten resin diffusion plates can be inserted and removed and exchanged.

That is, as the plurality of types of molten resin ejected from the single flow path of the nozzle body into the space of the cylindrical member pass through the plurality of types of molten resin diffusion plates housed and held within this space, the molten resin spreads around the periphery. After being diffused in the direction and radial direction, it is injected into the mold from the injection hole of the cylindrical member, creating a beautiful mixed color pattern in which multiple types of molten resin are minutely dotted in a two-dimensional direction. can. Moreover, the mixed color pattern can be changed subtly and over a wide range by replacing the plurality of types of molten resin diffusion plates, by replacing them with other types, or by changing the number of plates arranged in parallel. In addition, appropriately controlling the reciprocating drive movement of the supply selection member in the direction of the orthogonal axes, the drive rotation around the orthogonal axes, or the drive rotation around the axis along the streamline direction of the supply channel. By this, the molten resin to be supplied from the plurality of supply channels to the single channel can be freely selected, such as by alternately supplying a plurality of types of molten resin or by continuously supplying a plurality of types of molten resin at the same time. Therefore, the color mixture pattern described above can be changed more subtly and widely.

Therefore, by simply adjusting the molten resin diffusion plate and the supply selection member, it is possible to easily create a beautiful mixed color pattern in which a plurality of types of molten resin are finely scattered in a two-dimensional direction. In addition, the mixed color pattern can be freely changed subtly and over a wide range, making it possible to economically and advantageously diversify product patterns.

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, a fixed platen 3 is connected to a cylinder case 1A of a mold clamping cylinder 1 via a tie bar 2, and a ram 1B of the cylinder 1 is extended and retracted to provide distance and distance from the fixed platen 3. Both male and female molding molds 5 and 6 are attached to opposite surfaces of the movable platen 4 which is slid in the direction, and are connected to the molten resin injection port of the female molding die 5 through a through hole formed in the fixed platen 3. The nozzle 7 that has been melted, the hoppers 8 and 8 that house two types of resin raw materials a and b of mutually different colors, and the resin raw materials a and b in the hoppers 8 and 8 are press-fitted into the nozzle 7 while being melted. In the injection molding machine equipped with a heater 9 and an injection cylinder 10, the nozzle 7 is constructed as follows.

That is, as shown in FIGS. 2 to 4, there is one channel 12 connected to the molten resin spouting hole 11, and two channels that supply the two types of molten resins a and b to this channel 12. The nozzle body 14, which is in communication with the flow paths 13A and 13B, is connected to the supply flow paths 13A and 13B.
13B and the single flow path 12, and are divided into two parts in the front and back at the point where the merging part 13B and the single flow path 12 meet. A through hole 15 in the vertical axis X direction perpendicular to the streamline direction of the supply channels 13A, 13B is provided on the upper side in the molten resin supply direction than the supply channel 13A, 13B.
13B is formed longitudinally, and the supply flow paths 13A, 13B are formed in the through hole 15.
Two channels 16a and 16b which can be connected in communication with each other are formed at a distance larger than the adjacent interval between the supply channels 13A and 13B, and the drive reciprocating movement in the vertical axis X direction is provided. According to the flow path 1
By selectively connecting 6a and 16b to the supply channels 13A and 13B, it is possible to select the molten resins a and b to be supplied from the supply channels 13A and 13B to the single channel 12. A round rod-shaped supply selection member 16 is inserted.

Further, a cylindrical member 17 having the ejection hole 11 is inserted into and removed from the tip of the nozzle body 14, and a plurality of types of molten resin diffusion plates 18A to 18D are inserted and removed between the single flow path 12 and the ejection hole 11. The molten resin diffusion plate 18A,
18B...An annular member 20... is interposed between each of them to regulate the distance between them.

Among the molten resin diffusion plates 18A...18D, diffusion plates 18A and 18D are located on both sides in the resin injection direction.
As shown in FIG.
1... are formed through the diffusion plates 18B and 18C located at the center, and resin flow holes 21... are formed through the diffusion plates 18B and 18C at four locations displaced by 90 degrees in the circumferential direction, respectively. Both diffusion plates 18B, 1
8C in the space 19 with the resin flow holes 21, 21... being displaced by 45 degrees from each other in the circumferential direction.
It is configured to be stored and held inside the device.

In addition, uneven parts 14a and 14b that can be fitted from the flow line direction of the supply channels 13A and 13B are formed on opposing surfaces of the divided nozzle parts 14A and 14B, so that these two divided nozzle parts 14A and 14B are removably fixedly connected via bolts 22 in a fitted state, and the rear divided nozzle portion 14
The supply channels 13A, 1 are provided on both left and right sides of B.
Molten resin supply connection port 23 communicating with 3B respectively
A, 23B and through hole 2 for bolt attachment to machine frame
4, 24, and so on.

Next, a driving device for the supply selection member 16 will be explained.

That is, a gate-shaped member 27 fixedly connected to the upper surface of the front divided nozzle part 14A via bolts 25 and a positioning pin 26 is rotatable about a shaft 28 extending in the front-rear direction via needle bearings 29, 29. A drive shaft 31A of a drive motor 31, which is fixedly connected to the protruding rear end portion of the rotary shaft 28 and the rear divided nozzle portion 14B via an L-shaped bracket 30, is connected to the sprockets 32A, 32A.
and a transmission chain 32B, and is fixedly connected to the lower surface of the front split nozzle portion 14A via a bolt 33 and a positioning pin 34. A spring 36 is provided to bias the selection member 16 in the backward direction, that is, upward, and the needle bearings 29, 29 of the rotating shaft 28 are provided.
The supply selection member 16 is located in the shaft portion located between
A first member that can come into contact with the roller follower 37 pivotally connected to the upper end and that moves the supply selection member 16 back and forth against the elastic biasing force of the spring 36.
a second cam surface 38 that allows backward movement of the supply selection member 16 by the cam surface 38a and the spring 36;
A drive rotary cam 38, which is formed continuously in the circumferential direction of the drive rotary cam 38, is fixed via a retaining pin 39 so as to be replaceable with another type.

For example, as shown in FIG. 6 and FIG.
or the first cam surface 38a and the second cam surface 38a have different numbers of formations.
By replacing the cam surface 38b with another type having a different length in the circumferential direction, the number of reciprocating movements of the supply selection member 16 per rotation of the rotating shaft 24 or the direction of reciprocating movement of the supply selection member 16 can be changed. The stopping time at both ends, that is, the supply selection member 16
The opening and closing times of both the supply channels 13A and 13B can be freely changed.

Further, drive rotational speed control including a stopped state of the drive motor 31 or the sprocket 32A, 3
The reciprocating speed of the supply selection member 16 can be changed to a plurality of stages by replacing the supply selection member 2A with another type or a combination of the two.

In the figure, 45... are molten resin relief grooves formed at multiple locations at appropriate intervals in the longitudinal axis X direction on the outer periphery of the through hole 15 of the front nozzle portion 14A, and 46... , cooling water pipes formed near both ends in the longitudinal axis X direction at the outer periphery of the through hole 15 of the front nozzle portion 14A.

The molten resin jetted and supplied into the space 19 of the cylindrical member 17 from the single flow path 12 of the nozzle body 14 flows around the surroundings as it passes through each resin distribution hole 21 of the diffusion plates 18A...18D. After being diffused in the direction and radial direction, it is injected into the molds 5 and 6 from the injection hole 11 of the cylindrical member 17, and the two types of molten resins a and b are finely scattered in the circumferential direction and the radial direction. It is possible to injection mold resin products with beautiful mixed color patterns.

Alternatively, the molten resin diffusion plates 18A...18D may be replaced with another type of diffusion plate that differs in at least one of the number, size, and formation position of the resin flow holes 21; 18
By changing the number of parallel sheets A, the mixed color pattern can be changed subtly and over a wide range, and furthermore, by reciprocating the supply selection member 16, the supply flow can be changed. Road 13A, 13B
Since it is possible to alternately supply two types of molten resin to the single flow path 12, the above-mentioned method can be achieved by appropriately controlling the reciprocating speed of the supply selection member 16 and the stopping time at both ends in the reciprocating direction. The color mixture pattern can be changed more subtly.

Further, as shown in FIG. 8, the nozzle body 1
Another type of cylindrical member 1 that does not have the above-described space 19 and molten resin diffusion plate 18A...
7' is screwed and fixed, by controlling the reciprocating movement of the supply selection member 16, not only a single color resin product but also a concentric circular pattern in which two types of molten resins a and b are alternately located in the radial direction It is possible to injection mold a resin product with a beautiful mixed color pattern in which the two types of molten resins a and b are finely scattered in the circumferential and radial directions.

Incidentally, as shown in FIG. 9, the supply selection member 1
6, a first flow path 16a that can communicate only with the one supply flow path 13A, a second flow path 16b that can communicate only with the other supply flow path 13B, and a tower that simultaneously connects both the supply flow paths 13A and 13B. A first cam surface 38a is formed on the outer circumferential surface of the driving rotary cam 38 to communicate the one supply channel 13A and the first channel 16a. , a second cam surface 38b that communicates the other supply flow path 13B and the second flow path 16b, and both supply flow paths 13A, 13B and the third flow path 1.
A third cam surface 38c may be formed to communicate with 6c and 16c.

Further, as shown in FIG. 10, the supply selection member 16 is configured to be rotatable around the vertical axis X with respect to the front split nozzle portion 14A of the nozzle body 14. and the drive shaft 31A of the drive motor 31 are connected to a bevel gear pair 40A,
40B, and a portion of the supply selection member 16 corresponding to both the supply channels 13A, 13B is provided with an alternative to the supply channels 13A, 13B by drive rotation of the supply selection member 16. It is also possible to form channels 16a and 16b that communicate with each other.

Furthermore, as shown in FIGS. 11 and 12, both divided nozzle parts 14A and 14B of the nozzle body 14
In the space 41 formed between the two supply channels 13
The supply selection member 16, which has flow passages 16d formed at three locations in the circumferential direction of the portion corresponding to the supply flow passages 13A and 13B, is rotatable around an axis Y along the streamline direction of both the supply flow passages 13A and 13B. Provided, this supply selection member 1
A rotary shaft 42 fixed to the rotary shaft 6 is projected rearward through a through hole formed in the rear divided nozzle portion 14B and the mounting bracket 30 of the drive motor 31, and the protruding shaft portion of the rotary shaft 42 and the drive motor 31 are connected to each other. The drive shaft 31A may be interlocked with the drive shaft 31A via the chain transmission mechanism 32.

As shown in FIG. 13, the molten resin diffusion plates 18A and the annular members 20 are fitted between their abutting surfaces from the direction in which they are arranged side by side, so that both the molten resin diffusion plates 18A and 20 are connected to each other. Concave and convex portions 43, 44, . . . may be formed to prevent relative rotation.

Further, the supply channels 13A, 13B and the channels 16a, 16b formed in the supply selection member 16
The number may be appropriately set depending on the number of molten resins used and the pattern of the molded product.

[Brief explanation of the drawing]

The drawings show an embodiment of the nozzle for mixed color injection molding according to the present invention, FIG. 1 is a schematic diagram of the main parts of the injection molding machine, FIG. 2 is a longitudinal cross-sectional side view of the nozzle, and FIG.
4 is a sectional view taken along the - line in FIG. 2, FIG. 5 A to D are front views of each molten resin diffusion plate, and FIGS. FIG. 8 is a longitudinal sectional side view of the main part showing another type of cylindrical member, FIGS. 9 and 10 are longitudinal sectional side views of the main part showing other embodiments, and FIG.
Figures 12 and 12 are a longitudinal sectional side view of a main part of another embodiment and a front view of a supply selection member used therein, and FIG. 13 is a perspective view of another molten resin diffusion plate. 11... Molten resin ejection hole, 12... Single flow path, 1
3A, 13B... Supply channel, 14... Nozzle body, 16... Supply selection member, 17... Cylindrical member,
18A, 18B... Molten resin diffusion plate, 19... Space.

Claims (1)

[Scope of utility model registration request] One flow path 12 connected to the molten resin jet hole 11
and a plurality of channels 13A that supply a plurality of types of molten resin with mutually different colors to the channel 12,
13B of the nozzle body 14, which is in communication with the nozzle body 13B.
An axis that is perpendicular or almost perpendicular to the flow line direction of the plurality of supply channels 13A, 13B at the confluence point of the plurality of flow channels 13A, 13B and the single flow channel 12 or on the upper side in the molten resin supply direction than that. drive reciprocating movement in the direction or drive rotation around the orthogonal axes,
Alternatively, the molten resin to be supplied from the plurality of supply channels 13A, 13B to the single channel 12 is selected by drive rotation around an axis along or approximately along the streamline direction of the supply channels 13A, 13B. In addition to providing a possible member 16, the nozzle body 1
4, a cylindrical member 17 having the ejection hole 11 is disposed between the single flow path 12 and the ejection hole 11, and a plurality of types of molten resin diffusion plates 18A, 18B...
A nozzle for mixed color injection molding, characterized in that the nozzle is detachably attached to form a space 19 for storing and holding an insert plate in a replaceable manner.