JPH0342986Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a multicolor injection molding machine.

(Prior art) In Figs. 5 and 6, 1 is a fixed platen;
Reference numeral 2 denotes a movable platen (or mold reversing device), and molds (not shown) are mounted between these platens, that is, between mold mounting surfaces a and b, respectively. 3 is a locate ring hole provided in the fixed platen 1.

In this conventional screw parallel type two-color molding machine, the diameter of the locate ring hole 3 is d as shown in Figure 8.
It was common to provide two holes with a pitch of P corresponding to the locate ring. Therefore, the nozzle pitch was also provided at a pitch that matched the pitch P of the locate ring hole, and the angle α was also constant (including the case where the angle is parallel).

(Problem that the invention attempts to solve) For this reason, in the past, the pitch P of the locate ring hole was constant, so basically the mold side was aligned with the molding machine (locate ring hole), or sometimes with the mold. Therefore, it was necessary to manufacture a fixed platen with a locating ring hole. In many cases, this was a major constraint on the cavity arrangement in the mold and, ultimately, on the shape of the molded part.

(Purpose of the invention) As mentioned above, in a multi-color molding machine with screws arranged in parallel, the mold is designed to match the pitch of the locate ring holes of the molding machine, but since the locate ring holes were constant. In order to solve the problem of being subject to considerable restrictions, we aim to provide versatility so that molding machine users (mold manufacturers) can select from several types of locating ring pitches with one molding machine. It is.

(Solution by invention) In a screw parallel type multicolor molding machine in which a fixed platen is provided with a plurality of locate ring holes corresponding to the locate rings, the centers of the respective locate ring holes are shifted on the same axis line, and a plurality of locate rings are inserted. The nozzle pitches P ₁ , P ₂ . . . are made variable, and the nozzle pitches P ₁ , P _{2 .} . . are made variable.

(Example) An explanation will be given based on FIGS. 1 to 4. FIG. 1 is a side view of the mold attachment part of an injection molding machine, FIG. 2 is a front view of the fixed platen 1 in the direction of the arrows in FIG. 1, and FIG. 3 is a view in the direction of the arrows in FIG. Figure 4 is also a view in the direction of the arrows.

In this embodiment, as shown in FIG. 4, a plurality of locate ring holes with hole diameters d corresponding to the respective locate rings are provided on the fixed platen 1 on the same axis, and three types of locate ring pitches P ₁ , This hole was drilled corresponding to P ₂ and P ₃ . Accordingly, the nozzle pitch is also set to be changeable to P ₁ , P ₂ , and P ₃ as shown in FIG. 3, and the angle is also variable in three types: α ₁ , α ₂ , and α ₃ .

In this embodiment, three locate ring holes are overlapped with each other, but the holes may be independent from each other. Moreover, the number of locate ring holes may of course be two or four or more.

(Effect) In the screw parallel type multi-color molding machine, a plurality of locate ring holes are provided in the fixed platen corresponding to each locate ring, and the locate ring holes are provided with a plurality of holes with the same diameter d in the locate ring. In order to correspond to this, _the holes are drilled at multiple pitches _{P 1 , P 2} .
Since α ₂ is variable, there is no need to forcibly design a mold to match the pitch of the locate ring hole in a multi-color molding machine with screws arranged in parallel, and the molding machine user can use only one molding machine. Since several types of locating ring pitches can be selected, the versatility of the molding machine can be further improved.

[Brief explanation of drawings]

FIG. 1 is a side view of the mold attachment part of the injection molding machine. FIG. 2 is a view taken along the arrow in FIG. FIG. 3 is a view taken along the arrow in FIG. Figure 4 is an enlarged view of the locate ring hole. Fifth
The figure is a side view of the mold attachment part of a conventional injection molding machine.
FIG. 6 is a view taken along the arrow in FIG. FIG. 7 is a view taken along the arrow in FIG. Figure 8 is an enlarged view of the locate ring hole. In the figure: 1...fixed platen, 2...movable platen, 3, 3a...locate ring hole.

Claims (1)

[Scope of utility model registration request] In a screw parallel type multi-color molding machine in which a fixed platen is provided with multiple locate ring holes corresponding to the locate rings, the centers of the respective locate ring holes are shifted on the same axis to adjust the pitches of the multiple locate rings P ₁ , P _2. A multi-color injection molding machine characterized in that the nozzle pitches P ₁ , P ₂ , etc. are made variable in accordance with this.