JPH0444340Y2

JPH0444340Y2 -

Info

Publication number: JPH0444340Y2
Application number: JP10739988U
Authority: JP
Priority date: 1988-08-16
Filing date: 1988-08-16
Publication date: 1992-10-20
Also published as: JPH0229712U

Description

【考案の詳細な説明】〔産業上の利用分野〕本考案は、射出成形機等の可塑化装置におい
て、異なる材料を可塑化装置へ切替え供給する材
料切替え供給装置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a material switching and supplying device for switching and supplying different materials to a plasticizing device such as an injection molding machine.

〔従来の技術〕従来、射出成形における多品種少量生産のた
め、可塑化装置に供給する成形材料を異種の成形
材料に切替える材料供給装置として次のイ，ロの
ものが知られている。[Prior Art] Conventionally, for high-mix, low-volume production in injection molding, the following material supply devices (A) and (B) are known as material supply devices for switching the molding material supplied to a plasticizing device to a different type of molding material.

イ第３図に示すように、可塑化装置２１の材料
供給口２１に、該材料供給口２１に選択的に連
通可能な複数個の孔２５を穿設した回転あるい
は摺動自在な接続変換装置２３を配設するとと
もに、該接続変換装置２３上に前記各孔２５と
合致するように複数個のホツパを着脱自在に装
着した粉・粒状材料の供給交換装置（実開昭59
−24305号公報参照）。(a) As shown in FIG. 3, a rotatable or slidable connection conversion device in which a plurality of holes 25 that can selectively communicate with the material supply port 21 of the plasticizing device 21 are provided. 23 and a plurality of hoppers removably mounted on the connection conversion device 23 so as to match each hole 25 (Utility Model 59)
-Refer to Publication No. 24305).

ロ第４図に示すように、射出成形機３１に吸引
ホツパ３２を設け、該吸引ホツパ３２と別途設
けられた複数の材料タンク３４ａ，３４ｂとを
供給管３５をカプラ３３でつなぎ替えることに
より材料替えを行なう材料供給装置。(b) As shown in FIG. 4, the injection molding machine 31 is provided with a suction hopper 32, and the suction hopper 32 and a plurality of separately provided material tanks 34a, 34b are reconnected by a supply pipe 35 using a coupler 33. Material supply device for changing.

[The problem that the idea aims to solve]

上述したイのものは、材料変換装置上に装着す
るホツパの数や容量に制限がある上、多数の可塑
化装置により成形を行なう場合、各可塑化装置毎
に本装置を設ける必要がある。そのためホツパへ
頻繁に材料補給が必要な上、ホツパの着脱や材料
の切替えに人手を要し、さらに複数のホツパの
内、未使用のホツパ内にほこりがたまるという問
題点がある。 In the above-mentioned method A, there is a limit to the number and capacity of hoppers that can be mounted on the material converting device, and when molding is performed using a large number of plasticizing devices, it is necessary to provide this device for each plasticizing device. Therefore, it is necessary to frequently supply materials to the hopper, labor is required to attach and detach the hopper and change materials, and there is a problem that dust accumulates in unused hoppers among the plurality of hoppers.

また上述したロのものは、カプラをつなぎ替え
て材料を切替えるので、そのたびにホツパおよび
供給管内の残留材料の清掃を行なわなければなら
ないため、大変な人手と労働を要するという問題
点がある。 Further, in the above-mentioned method (B), since the coupler is changed and the material is changed, the remaining material in the hopper and the supply pipe must be cleaned each time, which requires a lot of manpower and labor.

本考案は、上述の従来の技術の有する問題点に
鑑みてなされたものであり、材料の切替えを人手
を要することなく簡単に行なうとともに、材料切
替えに際し、ホツパ等の残留材料の清掃を必要と
しない材料切り替え供給装置を提供することを目
的とする。 The present invention has been developed in view of the above-mentioned problems of the conventional technology, and it is possible to easily change materials without requiring human labor, and also eliminates the need to clean residual materials such as hoppers when changing materials. The purpose of the present invention is to provide a material switching supply device that does not

[Means to solve the problem]

上記目的を達成するため、本考案の材料切り替
え供給装置においては、可塑化装置の供給口の上
方部に設置されたケーシングに支持した複数個の
吸引ホツパを備え、各吸引ホツパはそれぞれシヤ
ツタにより開閉される出口管を有し、その下方に
各出口管にそれぞれ連通する前記出口管の数と同
数の貫通孔を形成した押えブロツクを介在させ
て、回転駆動手段の起動により回転するデイスト
リビユータを配設し、該デイストリビユータは回
転により上開口部が前記押えブロツクの前記貫通
孔のいずれか一つと接続されるとともに下開口部
が前記供給口に接続する材料通路を有し、さらに
別途設置した前記吸引ホツパと同数の材料タンク
のいずれか一つと前記吸引ホツパのいずれか一つ
とを移送管を介して接続した。 In order to achieve the above object, the material switching and supplying device of the present invention is equipped with a plurality of suction hoppers supported by a casing installed above the supply port of the plasticizing device, and each suction hopper is opened and closed by a shutter. A distributor is provided which rotates when the rotational driving means is activated, by interposing a presser block below which is formed with the same number of through holes as the number of outlet pipes communicating with each of the outlet pipes. The distributor has a material passage whose upper opening is connected to one of the through holes of the presser block and whose lower opening is connected to the supply port by rotation, and the distributor is separately installed. Any one of the material tanks having the same number of suction hoppers and any one of the suction hoppers were connected via a transfer pipe.

また、複数台の可塑化装置を有し、各可塑化装
置が、その供給口の上方部に設置されたケーシン
グに支持した複数個の吸引ホツパを備え、各吸引
ホツパはそれぞれシヤツタにより開閉される出口
管を有し、その下方に各出口管とそれぞれ連通す
る前記出口管の数と同数の貫通孔を有する押えブ
ロツクを介在させて、回転駆動手段の起動により
回転するデイストリビユータを配設し、該デイス
トリビユータは、回転により上開口部が前記押え
ブロツクの前記貫通孔のいずれか一つと接続され
るとともに下開口部が前記供給口と接続する材料
通路を有し、さらに、前記吸引ホツパの数と同数
の材料タンクを別途設置し、各可塑化装置毎に、
前記吸引ホツパのいずれか一つと前記材料タンク
のいずれか一つとを移送管により接続することも
できる。 In addition, it has a plurality of plasticizing devices, and each plasticizing device is equipped with a plurality of suction hoppers supported by a casing installed above the supply port, and each suction hopper is opened and closed by a shutter. A distributor is provided which has outlet pipes and is rotated by activation of a rotational drive means, with a presser block having the same number of through holes as the outlet pipes communicating with each outlet pipe disposed below the outlet pipe. , the distributor has a material passage whose upper opening is connected to any one of the through holes of the presser block and whose lower opening is connected to the supply port when rotated, Separately install the same number of material tanks as the number of
Any one of the suction hoppers and any one of the material tanks can also be connected by a transfer pipe.

[Effect]

上記のように構成された本考案の材料切替え装
置の各材料タンクにそれぞれ異種の材料を貯蔵
し、該材料タンクより各吸引ホツパ内に所定量の
材料を移送しておく。ついで、デイストリビユー
タを回転駆動手段の起動により回転させ、希望す
る材料が入つている吸引ホツパの出口管と連通す
る押えブロツクの貫通孔と、デイストリビユータ
の材料通路の上開口部とを接続したのち、この吸
引ホツパのシヤツタを開き、可塑化装置の供給口
へ材料を流下させて可塑化を行なう。 Different types of materials are stored in each material tank of the material switching device of the present invention constructed as described above, and a predetermined amount of material is transferred from the material tank to each suction hopper. Next, the distributor is rotated by activation of the rotation drive means, and the through hole of the presser block communicating with the outlet pipe of the suction hopper containing the desired material is connected to the upper opening of the material passage of the distributor. Thereafter, the shutter of this suction hopper is opened, and the material is allowed to flow down into the supply port of the plasticizing device to perform plasticization.

他方、可塑化装置へ供給する材料の材料替えを
行なう際には、可塑化装置に接続されている吸引
ホツパのシヤツタを閉じ、材料通路内および可塑
化装置内の残留材料をすべて消費する。ついで、
回転駆動手段を起動してデイストリビユータを回
転させ、次に希望する材料の入つている吸引ホツ
パの出口管と連通した押えブロツクの貫通口と、
デイストリビユータの材料通路の上開口部とを接
続したのち、この吸引ホツパのシヤツタを開き、
可塑化装置の供給口へ次の希望する材料を流化さ
せ、しばらく可塑化装置内のパージを行なつて材
料替えを行なう。 On the other hand, when changing the material supplied to the plasticizing device, the shutter of the suction hopper connected to the plasticizing device is closed to consume all the remaining material in the material passage and in the plasticizing device. Then,
activating the rotation drive means to rotate the distributor, and then opening the presser block through-hole communicating with the outlet pipe of the suction hopper containing the desired material;
After connecting the upper opening of the material passage of the distributor, open the shutter of this suction hopper,
The next desired material is flowed into the supply port of the plasticizing device, the inside of the plasticizing device is purged for a while, and the material is replaced.

また、可塑化装置を複数台設置した場合におい
ても、各可塑化装置毎に上述の場合と同様の操作
を行なうことにより材料の切替えを行なう。 Furthermore, even when a plurality of plasticizing devices are installed, the materials can be switched by performing the same operations as described above for each plasticizing device.

〔Example〕

本考案の一実施例を図面を参照して説明する。 An embodiment of the present invention will be described with reference to the drawings.

第１図および第２図に示す実施例は、２台の可
塑化装置２−１，２−２を設置し、各可塑化装置
２−１，２−２には、それぞれ５個の吸引ホツパ
１ａ，１ｂ……を設け、これと同数の５個の材料
タンク１４ａ，１４ｂ，１４ｃ，１４ｄ，１４ｅ
を別途床上に設置した。 In the embodiment shown in FIGS. 1 and 2, two plasticizing devices 2-1 and 2-2 are installed, and each plasticizing device 2-1 and 2-2 is equipped with five suction hoppers. 1a, 1b... are provided, and the same number of five material tanks 14a, 14b, 14c, 14d, 14e are provided.
was installed separately on the floor.

床上に設置した材料タンク１４ａ，１４ｂ，１
４ｃ，１４ｄ，１４ｅにはそれぞれ異種の材料が
貯蔵される。２台の可塑化装置２−１，２−２は
ともに同様の構造を有し、以下に説明するように
構成されている。 Material tanks 14a, 14b, 1 installed on the floor
Different types of materials are stored in 4c, 14d, and 14e, respectively. The two plasticizing devices 2-1 and 2-2 both have similar structures and are configured as described below.

第２図に示すように、可塑化装置２−１の供給
口２ａの上方部には、例えばシリンダ壁に固着し
て設けケーシング９に支持した（支持手段は図示
せず）５個の吸引ホツパ１ａ，１ｂ，……（第１
図および第２図では、その内の二つのみが示され
ている。）を設け、各吸引ホツパ１ａ，１ｂ，…
…の下部には流体圧シリンダ１１ａ，１１ｂ，…
…により開閉されるシヤツタ１０ａ，１０ｂ，…
…がそれぞれ設けられている。そして、その下方
には前記吸引ホツパ１ａ，１ｂ，……の各出口管
３ａ，３ｂ，……とそれぞれ連通する５個の貫通
孔７を形成した押えブロツク８ｄを介在させてデ
イストリビユータ８が配設されている。該デイス
トリビユータ８は、軸受１２ａを介してケーシン
グ９内壁に支持された上ブロツク８ａ、軸受１２
ｂおよび１２ｃを介してケーシング９内壁に支持
された中ブロツク８ｂおよび軸受１２ｄを介して
ケーシング９内壁に支持された下ブロツク８ｃを
順次積み重ねるように設け、ボルト１９により一
体化されている。このため、前記デイストリビユ
ータ８は、前記中ブロツク８ｂ外周に嵌合した第
３歯車１３ｃに歯合う第２歯車１３ｂを介して回
転駆動手段１７の駆動軸に設けた第１歯車１３ａ
の回転が伝動されて回転する。 As shown in FIG. 2, above the supply port 2a of the plasticizing device 2-1, there are five suction hoppers fixed to the cylinder wall and supported by the casing 9 (supporting means not shown). 1a, 1b, ... (first
In the figure and FIG. 2, only two of them are shown. ), and each suction hopper 1a, 1b,...
At the bottom of... are fluid pressure cylinders 11a, 11b,...
Shutters 10a, 10b,... opened and closed by...
... are provided for each. A distributor 8 is mounted below the suction hopper 1a, 1b, . It is arranged. The distributor 8 includes an upper block 8a supported on the inner wall of the casing 9 via a bearing 12a, and a bearing 12.
A middle block 8b supported on the inner wall of the casing 9 via bearings 12d and a lower block 8c supported on the inner wall of the casing 9 via bearings 12d are stacked one on top of the other, and are integrated by bolts 19. Therefore, the distributor 8 is connected to the first gear 13a provided on the drive shaft of the rotary drive means 17 via the second gear 13b that meshes with the third gear 13c fitted on the outer periphery of the middle block 8b.
The rotation is transmitted and rotates.

さらに、上ブロツク８ａに形成された偏心孔
４、中ブロツク８ｂに形成された傾斜孔５および
下ブロツク８ｃに形成された中心孔６とが材料通
路を構成し、上記デイストリビユータ８の回転に
より、前記材料通路の上開口部である上ブロツク
の偏心孔４の上開口が、５個の吸引ホツパ１ａ，
１ｂ，……の出口管３ａ，３ｂ，……のいずれか
一つと接続される。一方、前記材料通路の下開口
部である下ブロツク８ｃの中心孔６の下開口は、
常に可塑化装置２−１の供給口２ａに接続されて
いるから、上述の材料通路の上開口部が接続され
た吸引ホツパのシヤツタを開くことにより、希望
する材料を可塑化装置２−１の供給口２ａへ流下
させることができる。ちなみに第２図に第２吸引
ホツパ１ｂの出口管３ｂにデイストリビユータ８
の上開口部が接続された状態を示す。この場合シ
ヤツタ１０ｂを開いて第２吸引ホツパ１ｂ内の材
料を可塑化装置２−１の供給口２ａへ流下させ
る。 Further, the eccentric hole 4 formed in the upper block 8a, the inclined hole 5 formed in the middle block 8b, and the center hole 6 formed in the lower block 8c constitute a material passage, and the rotation of the distributor 8 , the upper opening of the eccentric hole 4 of the upper block, which is the upper opening of the material passage, is connected to the five suction hoppers 1a,
1b, . . are connected to any one of the outlet pipes 3a, 3b, . On the other hand, the lower opening of the center hole 6 of the lower block 8c, which is the lower opening of the material passage, is
Since it is always connected to the supply port 2a of the plasticizing device 2-1, by opening the shutter of the suction hopper to which the upper opening of the material passage is connected, the desired material can be transferred to the plasticizing device 2-1. It can be made to flow down to the supply port 2a. By the way, in Fig. 2, a distributor 8 is connected to the outlet pipe 3b of the second suction hopper 1b.
The upper opening of the figure shows the connected state. In this case, the shutter 10b is opened to cause the material in the second suction hopper 1b to flow down to the supply port 2a of the plasticizing device 2-1.

なお、本実施例においては、加工を容易にする
ため上述のように上ブロツク８ａ、中ブロツク８
ｂおよび下ブロツク８ｃに分割したが、これに限
らず一体構造とすることもできる。 In this embodiment, in order to facilitate processing, the upper block 8a and the middle block 8 are
Although the structure is divided into a lower block 8c and a lower block 8c, the present invention is not limited to this, and an integral structure is also possible.

さらに、１６は吸引装置１５と前記５個の吸引
ホツパ１ａ，１ｂ，……との間の各管路に介在さ
せた切換えバルブであり、第１バルブないし第５
バルブ１６ａ，１６ｂ，１６ｃ，１６ｄ，１６ｅ
から構成されており、各可塑化装置２−１，２−
２毎に設けられている。ちなみに、第２図におい
ては、第１バルブ１６ａが第１吸引ホツパ１ａと
吸引装置１５との間の管路に設けられており、前
記第１バルブ１６ａを開くと第１図に示すよう
に、第１材料タンク１４ａ内の材料がその第１ホ
ース１４ａ−１を介して前記第１吸引ホツパ１ａ
内に吸引される。この各バルブ１６ａ，１６ｂ，
１６ｃ，１６ｄ，１６ｅの開閉は、各吸引ホツパ
１ａ，１ｂ，……毎に設けた上レベル計１８ａお
よび下レベル計１８ｂにより行なうようにすると
便利である。 Furthermore, 16 is a switching valve interposed in each pipe line between the suction device 15 and the five suction hoppers 1a, 1b, . . .
Valve 16a, 16b, 16c, 16d, 16e
Each plasticizing device 2-1, 2-
It is provided every 2. Incidentally, in FIG. 2, the first valve 16a is provided in the conduit between the first suction hopper 1a and the suction device 15, and when the first valve 16a is opened, as shown in FIG. The material in the first material tank 14a is transferred to the first suction hopper 1a through the first hose 14a-1.
sucked inside. These valves 16a, 16b,
It is convenient to open and close the suction hoppers 16c, 16d, 16e using an upper level gauge 18a and a lower level gauge 18b provided for each suction hopper 1a, 1b, .

さらに、第１図に示すように、第１可塑化装置
２−１および第２可塑化装置２−２のそれぞれの
第１吸引ホツパ１ａは、第１材料タンク１４ａと
移送管としての第１ホース１４ａ−１または第２
ホース１４ａ−２によりそれぞれ接続し、またそ
れぞれの第２吸引ホツパ１ｂは、第２材料タンク
１４ｂと第１ホース１４ｂ−１、第２ホース１４
ｂ−２によりそれぞれ接続し、図示しないが以下
同様に第３材料タンク１４ｃ、第４材料タンク１
４ｄまたは第５材料タンク１４ｅが各可塑化装置
２−１，２−２の第３吸引ホツパ、第４吸引ホツ
パまたは第５吸引ホツパにそれぞれ接続されてい
る。 Furthermore, as shown in FIG. 1, each of the first suction hoppers 1a of the first plasticizing device 2-1 and the second plasticizing device 2-2 has a first material tank 14a and a first hose as a transfer pipe. 14a-1 or second
Each of the second suction hoppers 1b is connected to the second material tank 14b, the first hose 14b-1, and the second hose 14 by a hose 14a-2.
b-2, and similarly connected to the third material tank 14c and the fourth material tank 1, although not shown.
4d or the fifth material tank 14e is connected to the third suction hopper, fourth suction hopper, or fifth suction hopper of each plasticizing device 2-1, 2-2, respectively.

上述の実施例にかえて材料タンクは２個以上の
複数個設置するとともに吸引ホツパの数もこの材
料タンクと同数のものとすることができる。さら
に、可塑化装置も１台または複数台とすることも
できる。 Instead of the above embodiment, two or more material tanks may be installed and the number of suction hoppers may be the same as the number of material tanks. Furthermore, the number of plasticizing devices can also be one or more.

[Effect of idea]

本考案は、上述のとおり構成されているので、
以下に記載する効果を奏する。 Since the present invention is configured as described above,
This produces the effects described below.

請求項１記載の考案においては、材料替え時の
ホツパや移送管内の清掃が不要であるため、きわ
めて短時間で材料替えを行なうことが可能とな
る。また、床等に複数の材料タンクを配設し、該
材料タンクから各吸引ホツパに逐次材料を補強可
能であるため、材料タンクを大型をしてその貯蔵
量を大とすることができ、材料の補強回数を減少
させることができる。 In the invention according to claim 1, since there is no need to clean the hopper or the inside of the transfer pipe when changing the material, it is possible to change the material in an extremely short time. In addition, it is possible to arrange multiple material tanks on the floor, etc., and to sequentially reinforce material from the material tanks to each suction hopper, so the material tank can be made larger and its storage capacity can be increased. The number of reinforcements can be reduced.

請求項２記載の考案においては、上記効果のほ
か、複数台の可塑化装置を設置した場合も材料タ
ンクを共用とすることができるので、各可塑化装
置毎に材料タンクを設ける必要がなく材料タンク
への材料補給が便利である。 In addition to the above-mentioned effects, the invention according to claim 2 allows the material tank to be shared even when a plurality of plasticizing devices are installed, so there is no need to provide a material tank for each plasticizing device, and the material It is convenient to replenish materials to the tank.

[Brief explanation of the drawing]

第１図は本考案の一実施例の全体の構成を示す
概略図、第２図は本考案のデイストリビユータを
示す断面図、第３図は従来の材料切替え供給装置
の要部断面図、第４図は他の従来の材料切替え供
給装置の概略図である。１ａ……第１吸引ホツパ、１ｂ……第２吸引ホ
ツパ、２−１，２−２……可塑化装置、２ａ……
供給口、３ａ，３ｂ……出口管、４……偏心孔、
５……傾斜孔、６……中心孔、７……貫通口、８
……デイストリビユータ、８ａ……上ブロツク、
８ｂ……中ブロツク、８ｃ……下ブロツク、８ｄ
……押えブロツク、９……ケーシング、１０ａ，
１０ｂ……シヤツタ、１１ａ，１１ｂ……流体圧
シリンダ、１２ａ，１２ｂ，１２ｃ，１２ｄ……
軸受、１３ａ……第１歯車、１３ｂ……第２歯
車、１３ｂ……第３歯車、１４ａ……第１材料タ
ンク、１４ｂ……第２材料タンク、１４ｃ……第
３材料タンク、１４ｄ……第４材料タンク、１４
ｅ……第５材料タンク、１５……吸引装置、１６
……切換えバルブ、１６ａ……第１バルブ、１６
ｂ……第２バルブ、１６ｃ……第３バルブ、１６
ｄ……第４バルブ、１６ｅ……第５バルブ、１７
……回転駆動手段。 FIG. 1 is a schematic diagram showing the overall configuration of an embodiment of the present invention, FIG. 2 is a sectional view showing a distributor of the present invention, and FIG. 3 is a sectional view of main parts of a conventional material switching and supplying device. FIG. 4 is a schematic diagram of another conventional material switching and supplying device. 1a...First suction hopper, 1b...Second suction hopper, 2-1, 2-2...Plasticizing device, 2a...
Supply port, 3a, 3b... Outlet pipe, 4... Eccentric hole,
5... Inclined hole, 6... Center hole, 7... Through hole, 8
...distributor, 8a...upper block,
8b...middle block, 8c...bottom block, 8d
... Presser block, 9 ... Casing, 10a,
10b...Shutter, 11a, 11b...Fluid pressure cylinder, 12a, 12b, 12c, 12d...
Bearing, 13a...first gear, 13b...second gear, 13b...third gear, 14a...first material tank, 14b...second material tank, 14c...third material tank, 14d... Fourth material tank, 14
e...Fifth material tank, 15...Suction device, 16
...Switching valve, 16a...First valve, 16
b...Second valve, 16c...Third valve, 16
d...Fourth valve, 16e...Fifth valve, 17
...Rotation drive means.

Claims

[Claims for Utility Model Registration] 1. A plasticizing device 2-1 is equipped with a plurality of suction hoppers 1a, 1b supported by a casing 9 installed above the supply port 2a, the suction hoppers 1a, 1b... ... are shutters 10a and 1, respectively.
Outlet pipes 3a, 3b... opened and closed by 0b...
..., and below each outlet pipe 3a, 3b...
The outlet pipes 3a, 3b, which respectively communicate with...
A distributor 8 is disposed which rotates when the rotation drive means 17 is activated, with a presser block 8d having the same number of through holes 7 interposed therebetween.
The distributor 8 has material passages 4, 5, and 6 whose upper opening is connected to any one of the through holes 7 of the presser block 8d and whose lower opening is connected to the supply port 2a by rotation. and the suction hopper 1 installed separately.
The same number of material tanks 14a, 14 as a, 1b...
This is a material switching and supplying device for a plasticizing apparatus, in which any one of the suction hoppers 1a, 1b, . 2 It has a plurality of plasticizing devices 2-1 and 2-2,
Each plasticizing device 2-1, 2-2 has its supply port 2
It is equipped with a plurality of suction hoppers 1a, 1b... supported by a casing 9 installed in the upper part of the
The suction hoppers 1a, 1b... have outlet pipes 3a, 3b... which are opened and closed by shutters 10a, 10b..., respectively, and the outlet pipes 3a communicate with the respective outlet pipes 3a, 3b below. , 3b, . . . , a presser block 8d in which the same number of through holes 7 are formed is disposed, and a distributor 8 that rotates when the rotation drive means 17 is activated is disposed. It has material passages 4, 5, and 6 whose openings are connected to any one of the through holes 7 of the presser block 8d and whose lower openings are connected to the supply port 2a, and furthermore, the suction hopper
The same number of material tanks 14a as a, 1b...
14b, 14c, 14d, 14e are separately installed, and for each plasticizing device 2-1, 2-2, one of the suction hoppers 1a, 1b... and the material tanks 14a, 14b, 14c, 14d,
A material switching and supplying device for a plasticizing device connected to any one of 14e through a transfer pipe.