JP2005238642A - Resin forming and its production die - Google Patents

Resin forming and its production die Download PDF

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Publication number
JP2005238642A
JP2005238642A JP2004051757A JP2004051757A JP2005238642A JP 2005238642 A JP2005238642 A JP 2005238642A JP 2004051757 A JP2004051757 A JP 2004051757A JP 2004051757 A JP2004051757 A JP 2004051757A JP 2005238642 A JP2005238642 A JP 2005238642A
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shaft
forming
shaft portion
mold
molded product
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JP4017607B2 (en
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Shinichi Yokoi
慎一 横井
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Yokoi Manufacturing Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0037—Moulding articles or parts thereof without parting line

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  • Dry Development In Electrophotography (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin forming which can be formed from a resin alone and prevents the occurrence of a parting line in a shaft part and a die for producing the formed article. <P>SOLUTION: The resin formed article has the cylindrical shaft part which is formed by injection molding and supported while being sealed by a sealant and the parting line outside the shaft part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、シール材によってシール状態で支持される円柱状をした軸部を有する樹脂成形品、特に、電子写真式の複写機やプリンタのトナーカートリッジ内に設けられる撹拌スクリュー等の樹脂成形品およびその製造金型に関する。   The present invention relates to a resin molded product having a cylindrical shaft portion supported in a sealed state by a sealing material, in particular, a resin molded product such as an agitating screw provided in a toner cartridge of an electrophotographic copying machine or printer, and It relates to the manufacturing mold.

図６に示すように、電子写真式の複写機やプリンタのトナーカートリッジ１００内には、内部のトナーを撹拌するために、撹拌スクリュー２００が設けられている（たとえば、特許文献１等参照）。
撹拌スクリュー２００は、図６および図７に示すように、中央にたとえばらせん状や羽根状をしたのスクリュー２１１を備えたスクリュー部２１０、両端に軸部２２０が設けられている。そして、この軸部２２０が、リング状のシール材（図示せず）を嵌装した状態でケーシング１１０の軸受け部に回転自在に支持されている。すなわち、シール材によって軸部２２０とケーシング１１０との隙間からトナーが外部に漏れ出ないようにしている（たとえば、特許文献２等参照）。 As shown in FIG. 6, a stirring screw 200 is provided in the toner cartridge 100 of an electrophotographic copying machine or printer to stir the internal toner (see, for example, Patent Document 1).
As shown in FIGS. 6 and 7, the stirring screw 200 is provided with a screw portion 210 including a screw 211 having a spiral shape or a blade shape in the center, and shaft portions 220 at both ends. And this axial part 220 is rotatably supported by the bearing part of the casing 110 in the state which fitted the ring-shaped sealing material (not shown). That is, the sealing material prevents the toner from leaking out from the gap between the shaft portion 220 and the casing 110 (see, for example, Patent Document 2).

また、従来の撹拌スクリュー２００は、図７に示すように、軸部２２０の耐久性が要求される軸受け部に受けられる部分に金属スリーブ３００が、樹脂製の撹拌スクリュー本体２０１の軸部形成部を囲繞するように外嵌されている。
しかし、この撹拌スクリュー２００は、まず、作業者が金型キャビティ内の所定位置に手作業で金属スリーブ３００をセットしたのち、金型を閉じ、撹拌スクリュー本体２０１を射出成形することによって得られるようになっていて、製造作業性が悪く、また、樹脂のみの成形品に比べコストがかかるという問題がある。また、金属スリーブを自動でキャビティ内にセットできるようになった金型も提案されているが、装置が複雑なものになり、製造コストの点で問題が残る。 Further, as shown in FIG. 7, the conventional stirring screw 200 has a metal sleeve 300 at a portion received by a bearing portion where durability of the shaft portion 220 is required, and a shaft portion forming portion of the resin-made stirring screw body 201. It is fitted outside so as to surround.
However, the stirring screw 200 is obtained by first setting the metal sleeve 300 manually at a predetermined position in the mold cavity by the operator, then closing the mold and injection molding the stirring screw body 201. Therefore, there is a problem that the manufacturing workability is poor and the cost is higher than that of a resin-only molded product. Further, although a metal mold has been proposed in which a metal sleeve can be automatically set in a cavity, the apparatus becomes complicated and a problem remains in terms of manufacturing cost.

そこで、本発明の発明者は、軸部にあまり耐久性が要求されない、小型プリンタ等のトナーカートリッジに使用される撹拌スクリューの場合、金属スリーブを用いず、射出成形によって軸部全体をスクリュー本体とともに樹脂で成形してはどうかと考えた。   Therefore, in the case of a stirring screw used for a toner cartridge such as a small printer, the inventor of the present invention does not require much durability, and the entire shaft portion together with the screw main body is formed by injection molding without using a metal sleeve. I thought about molding with resin.

特開平７−２５３７０６号公報JP-A-7-253706 特開平８−１９０２６８号公報JP-A-8-190268

しかし、撹拌スクリュー２００には、図７に示すように、軸部２２０の先端部に撹拌スクリュー２００の抜け止め用のEリングが嵌め込まれるリング状の溝２２１が存在し、この溝２２１がアンダーカットとなるため、通常、金型は、撹拌スクリュー２００の中心軸に平行な線で分割された形状をとらなければならない。
したがって、従来の射出成形金型を用いたのでは、金型製造初期には、金型のがたつきや磨耗等がなく、パーティングラインもほとんど問題がないのであるが、何度も射出を繰り返す内に金型のずれによって、図８に示すように、軸部２２０のパーティングライン部分に段差４００が生じたり、図９に示すように、バリ５００が生じてしまう。 However, as shown in FIG. 7, the stirring screw 200 has a ring-shaped groove 221 in which an E-ring for preventing the stirring screw 200 from coming off is fitted at the tip of the shaft portion 220, and this groove 221 is an undercut. Therefore, usually, the mold must take a shape divided by a line parallel to the central axis of the stirring screw 200.
Therefore, using a conventional injection mold, there is no rattling or wear of the mold at the initial stage of mold production, and there is almost no problem with the parting line. As shown in FIG. 8, a step 400 is generated in the parting line portion of the shaft portion 220 or a burr 500 is generated as shown in FIG.

そして、上記のような大きな段差４００やバリ５００等が軸部の表面に生じると、段差４００のコーナー部やバリ５００によってシール材を傷つけてシール性を損ない、トナーの漏れ等が発生する恐れがある。   If such a large step 400, burr 500, or the like as described above is generated on the surface of the shaft portion, the sealing material may be damaged by the corner portion or burr 500 of the step 400, the sealing performance may be impaired, and toner leakage or the like may occur. is there.

そこで、本発明は、上記事情に鑑みて、全体を樹脂のみで成形でき、軸部にパーティングラインが生じない樹脂成形品およびその製造金型を提供することを目的としている。   SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a resin molded product that can be molded entirely with a resin and that does not generate a parting line at a shaft portion, and a mold for manufacturing the resin molded product.

上記目的を達成するために、本発明にかかる樹脂成形品は、シール材によってシール状態で支持される円柱状をした軸部を有し、この軸部が射出成形によって形成されている樹脂成形品であって、前記軸部外にパーティングラインを備えていることを特徴としている。   In order to achieve the above object, a resin molded product according to the present invention has a cylindrical shaft portion supported in a sealed state by a sealing material, and the shaft portion is formed by injection molding. And it is characterized by providing a parting line outside the shaft part.

また、本発明の樹脂成形品の用途としては、特に限定されないが、たとえば、トナーカートリッジの撹拌スクリューが挙げられる。
樹脂成形品に用いられる樹脂としては、特に限定されないが、たとえば、ポリエステル、ポリプロピレン、ポリエチレン等が挙げられる。 Further, the use of the resin molded product of the present invention is not particularly limited, and examples thereof include a stirring screw for a toner cartridge.
Although it does not specifically limit as resin used for a resin molded product, For example, polyester, a polypropylene, polyethylene, etc. are mentioned.

一方、本発明にかかる樹脂成形品の製造金型は、シール材によってシール状態で支持される円柱状をした軸部を有し、この軸部の先端部の軸周回りに溝が形成された樹脂成形品の製造金型であって、軸部のうちの溝形成部を含む先端部を形成する軸部先端キャビティ部を有し、軸部の中心軸を通る分割線で分割された複数の軸部先端形成用スライド型と、軸部の少なくともシール材によってシールされる部分を形成する円柱状キャビティ部を有し、軸部先端形成用スライド型が開いた状態で、円柱状キャビティ部の中心軸に沿って、成形位置と、成形品取り出し位置との間を進退可能な、シール材支持部形成用入れ子とを備えることを特徴としている。   On the other hand, the mold for producing a resin molded product according to the present invention has a cylindrical shaft portion that is supported in a sealed state by a sealing material, and a groove is formed around the shaft periphery of the tip portion of the shaft portion. A mold for producing a resin molded product, which has a shaft portion tip cavity portion that forms a tip portion including a groove forming portion of the shaft portion, and is divided by a dividing line that passes through the central axis of the shaft portion. A shaft type tip forming slide mold and a cylindrical cavity part that forms at least a portion of the shaft part sealed by the sealing material, and the shaft type tip forming slide mold is open, the center of the cylindrical cavity part A seal material supporting portion forming nest is provided, which is capable of moving back and forth between a molding position and a molded product take-out position along the axis.

また、シール材によってシール状態で支持される円柱状をした軸部を有し、この軸部の先端部の軸周回りに溝が形成された樹脂成形品の製造金型であって、軸部の少なくともシール材によってシールされる部分から軸部先端部の溝形成部以外のキャビティ部を有する軸部形成用入れ子と、軸部の中心軸を通る分割線で分割された複数の分割型からなり、これらの分割型が、前記軸部形成用入れ子に設けられたスライド孔にスライド嵌合し、閉合状態で溝形成用キャビティ部を形成する溝形成用スライド型とを備え、前記軸部形成用入れ子は、前記溝形成用スライド型の分割型が前記スライド孔から完全に離脱した状態で成形位置と、成形品取り出し位置との間を進退可能に形成されていることを特徴としている。   A mold for manufacturing a resin molded product having a cylindrical shaft portion that is supported in a sealed state by a sealing material, and having a groove formed around the shaft circumference of the tip portion of the shaft portion. A shaft portion forming insert having a cavity portion other than the groove forming portion at the tip portion of the shaft portion from at least a portion sealed by the sealing material, and a plurality of split molds divided by a dividing line passing through the central axis of the shaft portion. The split mold includes a groove-forming slide mold that slide-fits into a slide hole provided in the shaft-forming insert and forms a groove-forming cavity in a closed state. The nesting is characterized in that it is formed so as to be able to advance and retreat between a molding position and a molded product take-out position in a state where the split mold of the groove forming slide mold is completely detached from the slide hole.

本発明にかかる樹脂成形品は、以上のように、全体が射出成形によって形成されているとともに、前記軸部外にパーティングラインを備えているので、金型にがたつきや磨耗が生じても、軸部のシール材にあたる部分は常に平滑な状態に保たれる。したがって、シール材のシール性を確保することができる。また、金属スリーブが不要で射出成形のみで樹脂成形品全体を成形できるので、製造コストを低減できる。
そして、トナーカートリッジの撹拌スクリューを本発明の樹脂成形品とすれば、トナーカートリッジのコストも低減できる。 As described above, the resin molded product according to the present invention is formed by injection molding as a whole, and has a parting line outside the shaft portion. However, the portion corresponding to the seal material of the shaft portion is always kept in a smooth state. Therefore, the sealing performance of the sealing material can be ensured. Further, since the entire resin molded product can be molded only by injection molding without using a metal sleeve, the manufacturing cost can be reduced.
If the stirring screw of the toner cartridge is the resin molded product of the present invention, the cost of the toner cartridge can be reduced.

本発明にかかる樹脂成形品の製造金型は、溝形成部を含む先端部を形成する軸部先端キャビティ部を有し、軸部の中心軸を通る分割線で分割された複数の分割型からなる軸部先端形成用スライド型と、軸部の少なくともシール材によってシールされる部分を形成する円柱状キャビティ部を有し、軸部先端形成用スライド型が開いた状態で、円柱状キャビティ部の中心軸に沿って、成形位置と、成形品取り出し位置との間を進退可能な、シール材支持部形成用入れ子とを備える、あるいは、軸部の少なくともシール材によってシールされる部分から軸部先端部の溝形成部以外のキャビティ部を有する軸部形成用入れ子と、
軸部の中心軸を通る分割線で分割され閉合状態で溝の底となる小径部を形成する複数の溝形成用型板とを備え、これらの溝形成用型板が、前記軸部形成用入れ子に設けられたスライド孔にスライド嵌合自在となるとともに、スライド孔にスアイド嵌合した閉合状態で小径部形成キャビティ部を形成し、前記軸部形成用入れ子が、各溝形成用型板が前記スライド孔から完全に離脱した状態で成形位置と、成形品取り出し位置との間を進退可能に形成されていることを特徴とするので、本発明の樹脂成形品を生産性よく製造することができる。 A mold for producing a resin molded product according to the present invention has a shaft portion tip cavity portion that forms a tip portion including a groove forming portion, and includes a plurality of divided dies that are divided by a dividing line that passes through the central axis of the shaft portion. And a cylindrical cavity part that forms at least a portion of the shaft part that is sealed by the sealing material, and the cylindrical cavity part is A seal material support forming nest that can move back and forth between a molding position and a molded product take-out position along the central axis, or includes at least a portion of the shaft portion that is sealed by the sealing material to the tip of the shaft portion Nest for forming a shaft portion having a cavity portion other than the groove forming portion of the portion,
A plurality of groove forming templates that form a small-diameter portion that is divided by a dividing line passing through the central axis of the shaft portion and forms the bottom of the groove in a closed state, and these groove forming template plates are used for forming the shaft portion. The slide hole provided in the nest is slidably engageable, and the small-diameter portion forming cavity is formed in a closed state in which the slide hole is slide-fitted. The resin molded product of the present invention can be manufactured with high productivity because it is formed so as to be able to advance and retreat between the molding position and the molded product take-out position in a state of being completely detached from the slide hole. it can.

以下に、本発明を、その実施の形態をあらわす図面を参照しつつ詳しく説明する。
図１は、本発明にかかる樹脂成形品の１例であるトナーカートリッジの撹拌スクリューをあらわしている。 Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
FIG. 1 shows a stirring screw of a toner cartridge which is an example of a resin molded product according to the present invention.

図１に示すように、この撹拌スクリュー１は、全体が射出成形で形成されていて、スクリュー部２の両端に軸部（図では片側しかあらわれていない）３を備えている。
スクリュー部２は、円柱状の芯部２１とこの芯部２１の周囲にらせん状に設けられたスクリュー２２とを備えている。 As shown in FIG. 1, the agitation screw 1 is entirely formed by injection molding, and includes shaft portions (only one side is shown in the figure) 3 at both ends of the screw portion 2.
The screw part 2 includes a cylindrical core part 21 and a screw 22 provided in a spiral shape around the core part 21.

軸部３は、その先端部３１にＥリング（図示せず）が嵌め込まれる溝３２が形成されている。
また、この撹拌スクリュー１は、軸部３のシール材（図示せず）に支持されるシール材支持部３３にパーティングラインがなく全周にわたって平滑になっていて、スクリュー部２および軸部３の先端部３１には、撹拌スクリュー１の中心軸に平行なパーティングラインＰＬが形成されている。 The shaft portion 3 is formed with a groove 32 into which an E-ring (not shown) is fitted at the tip portion 31.
Further, the stirring screw 1 has a sealing material support portion 33 supported by a sealing material (not shown) of the shaft portion 3 and has no parting line and is smooth over the entire circumference. The screw portion 2 and the shaft portion 3 A parting line PL parallel to the central axis of the stirring screw 1 is formed at the front end portion 31.

以上のように、この撹拌スクリュー１は、軸部３のシール材によって支持されるシール材支持部３３にパーティングラインが形成されないので、金型のガタツキによる段差や金型の磨耗によるバリ等の突起が軸部３のシール材によって支持されるシール材支持部３３に生じることがない。
したがって、軸部３を含むすべての部分が樹脂のみで形成されても、軸部３のシール材に支持されるシール材支持部３３を常に平滑な状態で製造することができ、シール材のシール性を確保できる。しかも、樹脂のみで形成されているので、生産性がよく、低コスト化を図ることができる。 As described above, since the stirring screw 1 does not have a parting line formed in the seal material support portion 33 supported by the seal material of the shaft portion 3, steps such as a step due to the backlash of the die and burrs due to wear of the die can be obtained. The protrusion does not occur in the sealing material support portion 33 supported by the sealing material of the shaft portion 3.
Therefore, even if all the parts including the shaft part 3 are made of only resin, the seal material support part 33 supported by the seal material of the shaft part 3 can be always manufactured in a smooth state. Can be secured. In addition, since it is formed of only resin, productivity is good and cost reduction can be achieved.

図２は、上記撹拌スクリュー１を製造する金型のゲートが設けられている側の軸部形成部の金型の要部の動きを工程順にあらわし、図３は製造金型のスプルー部分を断面であらわし、図４および図５は金型のゲートが設けられていない側の軸部形成部の金型の要部の動きを工程順にあらわしている。
図２〜図５に示すように、この金型４は、軸部先端形成用スライド型５と、シール材支持部形成用入れ子６と、スプルー型７と、軸部形成用入れ子８と、２枚の溝形成用型板９ａ，９ｂとを備えている。
図２および図３に示すように、２つの軸部先端形成用スライド型５は、閉合することによって、軸部３のうちの溝形成部を含む先端部を形成する軸部先端キャビティ部５１を形成し、軸部３の中心軸を通る。すなわち、軸部先端キャビティ部５１の中心軸を分割する分割線で分割された２つの分割型５ａ，５ｂから構成されている。 FIG. 2 shows the movement of the main part of the mold of the shaft forming part on the side where the gate of the mold for manufacturing the stirring screw 1 is provided in the order of steps, and FIG. 3 is a sectional view of the sprue part of the manufacturing mold. 4 and 5 show the movement of the main part of the mold in the shaft forming part on the side where the mold gate is not provided, in the order of steps.
As shown in FIGS. 2 to 5, this mold 4 includes a shaft portion tip forming slide mold 5, a seal material support portion forming insert 6, a sprue mold 7, a shaft portion forming insert 8, and 2. A plurality of groove forming templates 9a and 9b.
As shown in FIGS. 2 and 3, the two shaft portion tip forming slide dies 5 are closed to form a shaft portion tip cavity portion 51 that forms a tip portion including a groove forming portion of the shaft portion 3. And pass through the central axis of the shaft 3. That is, it is composed of two split molds 5a and 5b that are split along a split line that splits the central axis of the shaft tip cavity 51.

シール材支持部形成用入れ子６は、軸部３の少なくともシール材によってシールされるシール材支持部３３を形成する円柱状キャビティ部６１を有し、図２（ｂ）および図２（ｃ）に示すように、軸部先端形成用スライド型５の２つの分割型５ａ，５ｂが開いた状態で、円柱状キャビティ部６１の中心軸に沿って、図２（ｂ）に示す成形位置と、図２（ｃ）に示す成形品取り出し位置との間を進退可能になっている。   The seal material support portion forming insert 6 has a cylindrical cavity portion 61 that forms a seal material support portion 33 that is sealed by at least the seal material of the shaft portion 3, as shown in FIGS. 2 (b) and 2 (c). As shown, the molding position shown in FIG. 2 (b) is shown along the central axis of the cylindrical cavity portion 61 with the two split dies 5a and 5b of the shaft portion tip forming slide die 5 open. It is possible to advance and retreat between the molded product take-out positions shown in 2 (c).

また、図３に示すスプルー７１を備えたスプルー型７は、図３（ａ）に示す閉合状態から、成形が終了し、図３（ｂ）に示すように、軸部先端形成用スライド型５が開放方向（矢印Ａ,B方向）に動くと同時に軸部先端形成用スライド型５から離れる方向（矢印C方向）に動くようになっている。
なお、ゲートは、ピンゲート方式になっている。また、図２中、Ｒは、ランナであって成形完了後に除去される。 Further, the sprue die 7 provided with the sprue 71 shown in FIG. 3 has been molded from the closed state shown in FIG. 3A, and as shown in FIG. Moves in the opening direction (arrows A and B directions) and moves away from the shaft tip forming slide mold 5 (arrow C direction).
The gate is a pin gate type. In FIG. 2, R is a runner and is removed after the molding is completed.

図４（ａ）に示すように、軸部形成用入れ子８および２つの溝形成用型板９ａ，９ｂは、閉合状態で、撹拌スクリュー１のゲートが設けられていない側の軸部３を形成するキャビティ部を備え、図４（ｄ）に示すように、軸部形成用入れ子８が、溝形成部以外の軸部３を形成する円柱状をしたキャビティ部８１を有し、溝３２を形成する部分に後述するがスライド嵌合するスライド孔８２が穿設されている。
一方、溝形成用型板９ａ，９ｂは、図４および図５に示すように、軸部３の中心軸を通る分割線で分割された２つの分割された形状をしていて、これらの溝形成用型板９ａ，９ｂが、軸部形成用入れ子８に設けられたスライド孔８２にスライド嵌合し、図４（ａ）および図５（ａ）に示すように、閉合状態で小径部形成キャビティ部９１を形成するようになっている。 As shown in FIG. 4A, the shaft forming nest 8 and the two groove forming templates 9a and 9b form a shaft 3 on the side where the gate of the stirring screw 1 is not provided in the closed state. 4 (d), the shaft portion forming insert 8 has a cylindrical cavity portion 81 that forms the shaft portion 3 other than the groove forming portion, and forms the groove 32. As shown in FIG. As will be described later, a slide hole 82 for sliding fitting is formed in the portion to be fitted.
On the other hand, as shown in FIGS. 4 and 5, the groove forming templates 9 a and 9 b have two divided shapes divided by a dividing line passing through the central axis of the shaft portion 3. The forming templates 9a and 9b are slidably fitted into the slide holes 82 provided in the shaft forming insert 8, and a small diameter portion is formed in the closed state as shown in FIGS. A cavity portion 91 is formed.

そして、軸部形成用入れ子８は、図４（ｃ）、図４（ｄ）および図５（ｂ）に示すように、溝形成用型板９ａ，９ｂがスライド孔８２から完全に離脱した状態で図４（ｃ）に示す成形位置と、図４（ｄ）の成形品取り出し位置との間を進退可能に形成されている。   Then, the shaft forming insert 8 is in a state in which the groove forming templates 9a and 9b are completely detached from the slide hole 82 as shown in FIGS. 4 (c), 4 (d) and 5 (b). Thus, it is formed so as to be movable back and forth between the molding position shown in FIG. 4C and the molded product take-out position shown in FIG.

本発明は、上記の実施の形態に限定されない。たとえば、上記の実施の形態では、樹脂成形品がトナーカートリッジの撹拌スクリューであったが、その他の撹拌スクリューとしても使用できる。また、上記の実施の形態では芯部のまわりにらせん状のスクリューのみかが形成されていたが、羽根状の突起を多数設けたものでも構わないし、両者を備えたものでも構わない。   The present invention is not limited to the above embodiment. For example, in the above embodiment, the resin molded product is the stirring screw of the toner cartridge, but it can also be used as another stirring screw. In the above-described embodiment, only the spiral screw is formed around the core portion. However, a plurality of blade-like protrusions may be provided or both may be provided.

上記の実施の形態では、金型のゲートが設けられる側の軸部が、軸部先端形成用スライド型５と、シール材支持部形成用入れ子６との組み合わせで形成され、ゲートが設けられない側の軸部が、軸部形成用入れ子８と、溝形成用型板９ａ，９ｂとの組み合わせで形成されるようになっているが、軸部の両側とも軸部先端形成用スライド型５と、シール材支持部形成用入れ子６との組み合わせで形成するようにしても構わないし、ゲートがスクリュー本体部に設けられていれば、軸部の両側とも、軸部形成用入れ子８と、溝形成用型板９ａ，９ｂの組み合わせで形成するようにしても構わない。
また、分割型５ａ、５ｂおよび溝形成用型板９ａ，９ｂは、金型の上下方向に可動するようになっていても、左右方向に可動するようになっていても構わない。 In the above embodiment, the shaft portion on the side where the mold gate is provided is formed by a combination of the shaft portion tip forming slide die 5 and the seal material supporting portion forming insert 6, and no gate is provided. The shaft portion on the side is formed by a combination of the shaft portion forming nest 8 and the groove forming templates 9a and 9b. The shaft portion tip forming slide mold 5 is formed on both sides of the shaft portion. Further, it may be formed in combination with the seal material supporting portion forming insert 6. If the gate is provided in the screw main body portion, the shaft portion forming insert 8 and the groove forming are formed on both sides of the shaft portion. You may make it form with the combination of the use template 9a, 9b.
Further, the split dies 5a and 5b and the groove forming templates 9a and 9b may be movable in the vertical direction of the mold or may be movable in the horizontal direction.

本発明にかかる樹脂成形品の１例であるトナーカートリッジの撹拌スクリューをあらわす要部平面図である。FIG. 3 is a plan view of a main part showing a stirring screw of a toner cartridge which is an example of a resin molded product according to the present invention. 本発明にかかる樹脂成形品の１例であるトナーカートリッジの撹拌スクリューの製造金型のゲートが設けられている側の要部の動きを工程順に説明する断面図であって、同図（ａ）は型閉じ状態をあらわし、同図（ｂ）は軸部先端形成用スライド型を開いた状態をあらわし、同図（ｃ）はシール材支持部形成用入れ子を成形品取り出し位置までスライドさせた状態をあらわしている。FIG. 6 is a cross-sectional view for explaining the movement of the main part on the side provided with the gate of the mold for producing the stirring screw of the toner cartridge, which is an example of the resin molded product according to the present invention, in the order of steps; Represents the closed state of the mold, FIG. 5B shows the opened state of the shaft tip forming slide mold, and FIG. 5C shows the state in which the seal material supporting portion forming insert is slid to the molded product removal position. Is shown. 図２の金型の軸部先端形成用スライド型と、金型のスプルー部の動きを説明する断面図であって、同図（ａ）は閉合状態をあらわし、同図（ｂ）は型開き状態をあらわしている。FIGS. 3A and 3B are cross-sectional views for explaining the movement of the shaft tip end forming slide mold of FIG. 2 and the sprue portion of the mold. FIG. 3A shows a closed state, and FIG. It shows the state. 図２の金型のゲートが設けられていない側の要部の動きを説明する断面図であって、同図（ａ）は樹脂充填前の型閉じ状態、同図（ｂ）は樹脂充填後の型閉じ状態、同図（ｃ）は、溝形成用型板を開いた状態、同図（ｄ）は型開き状態をあらわしている。FIGS. 3A and 3B are cross-sectional views for explaining the movement of the main part on the side where the gate of the mold of FIG. 2 is not provided, in which FIG. 2A is a closed state before resin filling, and FIG. FIG. 2C shows a state in which the groove forming template is opened, and FIG. 3D shows a state in which the mold is opened. 図４のＸ―Ｘ線断面図であって、図（ａ）は型閉じ状態、同図（ｂ）は型開き状態をあらわしている。FIGS. 4A and 4B are cross-sectional views taken along the line XX in FIG. 4, in which FIG. 4A shows a mold closed state, and FIG. 従来のトナーカートリッジの１例をあらわす断面図である。FIG. 10 is a cross-sectional view illustrating an example of a conventional toner cartridge. 従来の撹拌スクリューの要部平面図である。It is a principal part top view of the conventional stirring screw. 段差ができた状態を説明する軸部の断面図である。It is sectional drawing of the axial part explaining the state in which the level | step difference was made. バリができた状態を説明する軸部の断面図である。It is sectional drawing of the axial part explaining the state which the burr | flash was made.

符号の説明Explanation of symbols

１ 撹拌スクリュー（樹脂成形品）
２ スクリュー部
２１ 芯部
２２ スクリュー
３ 軸部
３１ 先端部
３２ 溝
ＰＬ パーティングライン
４ 製造金型
５ 軸部先端形成用スライド型
５ａ、５ｂ 分割型
５１ 軸部先端キャビティ部
６ シール材支持部形成用入れ子
６１ 円柱状キャビティ部
７ スプルー型
７１ スプルー
８ 軸部形成用入れ子
８１ キャビティ部
８２ スライド孔
９ａ，９ｂ 溝形成用型板
９１ 小径部形成キャビティ部 1 Stir screw (resin molded product)
2 Screw part 21 Core part 22 Screw 3 Shaft part 31 Tip part 32 Groove PL Parting line 4 Manufacturing mold 5 Shaft part tip forming slide mold 5a, 5b Split mold 51 Shaft part tip cavity part 6 For sealing material support part formation Nest 61 Cylindrical cavity portion 7 Sprue die 71 Sprue 8 Shaft portion forming insert 81 Cavity portion 82 Slide hole 9a, 9b Groove forming template 91 Small diameter portion forming cavity portion

Claims (4)

シール材によってシール状態で支持される円柱状をした軸部を有し、この軸部の先端部の軸周回りに溝が形成された樹脂成形品であって、全体が射出成形によって形成されているとともに、前記軸部外にパーティングラインを備えていることを特徴とする樹脂成形品。   A resin molded product having a cylindrical shaft portion that is supported in a sealed state by a sealing material, and a groove is formed around the shaft periphery of the distal end portion of the shaft portion, and the whole is formed by injection molding. And a parting line outside the shaft part. トナーカートリッジの撹拌スクリューである請求項１に記載の樹脂成形品。   The resin molded product according to claim 1, which is a stirring screw for a toner cartridge. シール材によってシール状態で支持される円柱状をした軸部を有し、この軸部の先端部の軸周回りに溝が形成された樹脂成形品の製造金型であって、軸部のうちの溝形成部を含む先端部を形成する軸部先端キャビティ部を有し、軸部の中心軸を通る分割線で分割された複数の分割型からなる軸部先端形成用スライド型と、
軸部の少なくともシール材によってシールされる部分を形成する円柱状キャビティ部を有し、
軸部先端形成用スライド型が開いた状態で、円柱状キャビティ部の中心軸に沿って、成形位置と、成形品取り出し位置との間を進退可能な、シール材支持部形成用入れ子とを備えることを特徴とする樹脂成形品の製造金型。 A mold for manufacturing a resin molded product having a cylindrical shaft portion that is supported in a sealed state by a sealing material, and a groove is formed around the shaft circumference of the tip portion of the shaft portion. A shaft part tip forming cavity comprising a shaft part tip cavity forming a tip part including the groove forming part, and a shaft part tip forming slide mold comprising a plurality of divided molds divided by a dividing line passing through the central axis of the shaft part
A cylindrical cavity portion that forms at least a portion of the shaft portion sealed by the sealing material;
A seal material supporting portion forming nest that can move back and forth between a molding position and a molded product take-out position along the central axis of the cylindrical cavity portion with the shaft portion tip forming slide mold open. A mold for manufacturing a resin molded product. シール材によってシール状態で支持される円柱状をした軸部を有し、この軸部の先端部の軸周回りに溝が形成された樹脂成形品の製造金型であって、
軸部の少なくともシール材によってシールされる部分から軸部先端部の溝形成部以外のキャビティ部を有する軸部形成用入れ子と、
軸部の中心軸を通る分割線で分割され閉合状態で溝の底となる小径部を形成する複数の溝形成用型板とを備え、
これらの溝形成用型板が、前記軸部形成用入れ子に設けられたスライド孔にスライド嵌合自在となるとともに、スライド孔にスアイド嵌合した閉合状態で小径部形成キャビティ部を形成し、前記軸部形成用入れ子が、各溝形成用型板が前記スライド孔から完全に離脱した状態で成形位置と、成形品取り出し位置との間を進退可能に形成されていることを特徴とする樹脂成形品の製造金型。 A mold for producing a resin molded product having a cylindrical shaft portion supported in a sealed state by a sealing material, and having a groove formed around the shaft circumference of the tip portion of the shaft portion,
A shaft portion nesting having a cavity portion other than the groove forming portion at the tip portion of the shaft portion from at least a portion sealed by the sealing material of the shaft portion
A plurality of groove forming templates that form a small diameter portion that is divided by a dividing line passing through the central axis of the shaft portion and forms the bottom of the groove in a closed state;
These groove forming templates can be slidably fitted into slide holes provided in the shaft portion nesting, and a small diameter portion forming cavity portion is formed in a closed state in which the slide holes are fitted with a slide. A resin molding characterized in that the shaft forming insert is formed so that it can be moved back and forth between a molding position and a molded product take-out position in a state where each groove forming template is completely detached from the slide hole. Product mold.
JP2004051757A 2004-02-26 2004-02-26 Stirring screw Expired - Lifetime JP4017607B2 (en)

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