JPH0550474A - Ribbed housing - Google Patents
Ribbed housingInfo
- Publication number
- JPH0550474A JPH0550474A JP3208126A JP20812691A JPH0550474A JP H0550474 A JPH0550474 A JP H0550474A JP 3208126 A JP3208126 A JP 3208126A JP 20812691 A JP20812691 A JP 20812691A JP H0550474 A JPH0550474 A JP H0550474A
- Authority
- JP
- Japan
- Prior art keywords
- front upper
- upper cover
- thin
- thickness
- rib
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Electrophotography Configuration And Component (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、カバー部材の外面側に
適当な外観品質が要求され、その内面側にリブが形成さ
れる射出成形品のリブ付きハウジングに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ribbed housing of an injection-molded product which requires a proper appearance quality on the outer surface side of a cover member and has ribs formed on the inner surface side thereof.
【０００２】[0002]
【従来の技術】外装カバーや内装カバー等の射出成形品
のハウジングは図６に示すように、比較的厚肉の厚いリ
ブ５１を設けると、カバー部材５０の外側面にヒケ５２
が発生する。このハウジングが上記の如くある程度の外
観品質を要求されるものである場合には、ヒケ５２によ
ってその外観品質を著しく損なわれてしまう。2. Description of the Related Art As shown in FIG. 6, a housing of an injection molded product such as an outer cover or an inner cover is provided with a relatively thick rib 51, and a sink mark 52 is formed on the outer surface of the cover member 50.
Occurs. When the housing is required to have a certain degree of appearance quality as described above, the sink mark 52 significantly impairs the appearance quality.
【０００３】そこで、従来では、図７や図８に示すよう
に、カバー部材５０のリブ５１の両側部分に肉ヌキ部５
３を設けてヒケ発生を防止するように図っている。Therefore, conventionally, as shown in FIG. 7 and FIG. 8, the meat pad 5 is formed on both sides of the rib 51 of the cover member 50.
3 is provided to prevent the occurrence of sink marks.
【０００４】また、ヒケのないリブ付きハウジングを得
る方法として、発泡剤を利用した低発泡形成法や樹脂間
を中空状態にするシンプレス成形法等の特殊成形法が知
られている。Further, as a method of obtaining a ribbed housing without sink marks, a special molding method such as a low foaming forming method using a foaming agent or a simpress molding method in which a resin is hollow is known.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、カバー
部材５０の肉ヌキ部５３によってヒケの発生を防止しよ
うとしても、ヒケを完全に押えきるには到っておらず、
更にカバー部材５０の肉厚を変化させることにより、外
観面にウエルドラインが発生し易いという問題があっ
た。However, even if an attempt is made to prevent the occurrence of sink marks by the hollow portion 53 of the cover member 50, the sink marks cannot be completely pressed down.
Further, there is a problem that a weld line is likely to occur on the external surface by changing the thickness of the cover member 50.
【０００６】また、特殊成形法でヒケのないリブ付きハ
ウジングを得る場合、低発泡成形法では２次発泡を防
ぐ、すなわち発泡ガスによる外観面へのフクレを防ぐた
め、冷却時間が長くなる。また、シンプレス成形法でも
射出成形中にガスをいれる工程が追加されるため、加工
時間が増大してしまう。従って、特殊成形法では時間の
増大によるコストアップとなる問題があった。Further, when a ribbed housing having no sink mark is obtained by the special molding method, the secondary foaming is prevented by the low foaming molding method, that is, blister on the appearance surface is prevented by foaming gas, so that the cooling time becomes long. Further, even in the sympress molding method, a step of adding gas during the injection molding is added, so that the processing time increases. Therefore, the special molding method has a problem that the cost increases due to the increase in time.
【０００７】本発明は、上述した従来の問題を解消し、
通常の射出成形法を用いしかもヒケが発生しないリブ付
きハウジングを提供することを目的としている。The present invention solves the above-mentioned conventional problems,
It is an object of the present invention to provide a ribbed housing that does not cause sink marks by using a normal injection molding method.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成する本発
明の構成は以下の如くである。 （１）カバー部材の外面側に適当な外観品質が要求さ
れ、その内面側にリブが形成される射出成形品のリブ付
きハウジングにおいて、前記リブに、前記カバー部材か
ら離れる方向にしたがって所定長さの薄肉部と該薄肉部
の肉厚よりも厚い肉厚の厚肉部とが順次形成され、前記
薄肉部の肉厚が前記カバー部材の肉厚よりも薄いことを
特徴とするリブ付きハウジング。The structure of the present invention for achieving the above object is as follows. (1) In a ribbed housing of an injection-molded product in which an appropriate appearance quality is required on the outer surface side of the cover member and a rib is formed on the inner surface side thereof, the rib has a predetermined length in a direction away from the cover member. The thin-walled portion and a thick-walled portion thicker than the thin-walled portion are sequentially formed, and the thin-walled portion is thinner than the cover member.
【０００９】（２）前記カバー部材から前記リブの薄肉
部をまたがってリブの厚肉部まで達する補強リブを設け
たことを特徴とする上記（１）に記載のリブ付きハウジ
ング。(2) The ribbed housing according to the above (1), wherein a reinforcing rib extending from the cover member to the thick portion of the rib over the thin portion of the rib is provided.
【００１０】[0010]
【作用】上記（１）の構成によれば、リブにカバー部材
から離れる方向にしたがって所定長さの薄肉部と肉厚の
厚い厚肉部とを順次形成し、薄肉部の肉厚がカバー部材
の肉厚よりも薄くしたので、カバー部材の外側面にヒケ
が発生せず、また薄肉部に続いて設けた厚肉部によっ
て、リブで部材を支持するときの強度が得られる。According to the above configuration (1), a thin portion having a predetermined length and a thick portion having a large thickness are sequentially formed in the rib in the direction away from the cover member, and the thickness of the thin portion is the cover member. Since the thickness is smaller than the wall thickness of No. 3, sink marks are not generated on the outer side surface of the cover member, and the thick portion provided subsequent to the thin portion provides strength when the member is supported by the ribs.
【００１１】上記（２）の構成によれば、補強リブによ
って薄肉部の強度が増すことができ、リブ自体の強度が
増す。According to the above configuration (2), the strength of the thin portion can be increased by the reinforcing rib, and the strength of the rib itself is increased.
【００１２】[0012]
【実施例】以下、本発明の実施例を添付図面に従って説
明する。図１は、カバーの１つに本発明にかかるリブ付
きハウジングが用いられたレーザープリンタの概略図で
あり、最初にレーザープリンタの概要について説明す
る。図１において、符号１は画像信号に基づいてレーザ
ービームを投射する露光光学装置、２は作像部である。
作像部２は、感光体ベルト３と、該感光体ベルト３を帯
電する帯電チャージャ４と、帯電後露光光学装置１によ
るレーザー光５の投射により形成される静電潜像を現像
する現像装置６と、給紙装置７からレジストローラ８に
よりタイミングをとって送られる記録紙に現像後のトナ
ー像を転写する転写チャージャ９と、転写後の記録紙を
定着する定着装置１０と、転写後の感光体ベルト３をク
リーニングするクリーニング装置１１とを有する。作像
部２により作像された記録紙は排紙部１２に排紙され
る。Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic view of a laser printer in which the ribbed housing according to the present invention is used for one of the covers. First, the outline of the laser printer will be described. In FIG. 1, reference numeral 1 is an exposure optical device that projects a laser beam based on an image signal, and 2 is an image forming unit.
The image forming unit 2 includes a photoconductor belt 3, a charging charger 4 that charges the photoconductor belt 3, and a developing device that develops an electrostatic latent image formed by projecting a laser beam 5 by the post-charging exposure optical device 1. 6, a transfer charger 9 for transferring the developed toner image onto the recording paper fed from the paper feeding device 7 by the registration roller 8 at a timing, a fixing device 10 for fixing the transferred recording paper, and a transfer charger 9 for transferring the recording paper. And a cleaning device 11 for cleaning the photosensitive belt 3. The recording paper image-formed by the image forming unit 2 is ejected to the paper ejection unit 12.
【００１３】このレーザプリンタにおいて、リブ付きハ
ウジングとして使用するカバーは前上カバー１３であ
る。この前上カバー１３は、外面側が現われているた
め、適当な外観品質が要求されている。前上カバー１３
の内面側には、図２に示すように、上記給紙装置７の給
紙ローラ７ａを支持するリブ１４，１４´と、図５に示
すコネクタ２０を支持するリブ２１が形成されている。In this laser printer, the cover used as the ribbed housing is the front upper cover 13. Since the outer surface of the front upper cover 13 is exposed, an appropriate appearance quality is required. Front upper cover 13
As shown in FIG. 2, ribs 14 and 14 'for supporting the sheet feeding roller 7a of the sheet feeding device 7 and a rib 21 for supporting the connector 20 shown in FIG.
【００１４】給紙ローラ７ａは、軸受１５，１５´を介
してリブ１４，１４´に支持されており、これによる強
度上の理由でリブ１４，１４´のリブ厚ａは前上カバー
１３の肉厚ｂと同等か、もしくはそれ以上取る必要があ
る。しかし、このようなリブ１４，１４´をつけた前上
カバー１３を射出成形によって得ようとすると、リブ１
４，１４´を設けた前上カバー１３の外側面に図６に示
すようなヒケが生じ、外観品質を損なうことは先に説明
した。The sheet feeding roller 7a is supported by the ribs 14 and 14 'through bearings 15 and 15'. For this reason, the rib thickness a of the ribs 14 and 14 'is equal to that of the front upper cover 13. It should be equal to or larger than the wall thickness b. However, if the front upper cover 13 having such ribs 14 and 14 'is to be obtained by injection molding, the rib 1
It has been described above that sink marks as shown in FIG. 6 occur on the outer surface of the front upper cover 13 provided with 4, 14 'and impair the appearance quality.
【００１５】かかる問題を解消するため、本発明は次の
ように措置を講じている。図２において、リブ１４，１
４´は前上カバー１３から離れる方向にしたがって肉厚
ｃの薄肉部１６，１６´と厚肉部１７，１７´とが順次
形成されている。すなわち、リブ１４，１４´の根元部
分に薄肉部１６，１６´が形成され、この薄肉部１６，
１６´の所定の長さｄを過ぎると、リブ厚ａが前上カバ
ー１３の肉厚ｂと同等か、もしくはそれ以上の厚肉部１
７，１７´となる。そして、薄肉部１６，１６´の肉厚
ｃは前上カバー１３の肉厚ｂよりも薄くなるように設定
されている。この場合、薄肉部１６，１６´の肉厚ｃは
前上カバー１３の肉厚ｂの２分の１ないし３分の２程度
が好ましく、２分の１よりも薄いと強度が弱くなり過ぎ
てしまい、３分の２より厚いと前上カバー１３にヒケが
生じてしまう。なお、本実施例ではリブ厚ａおよび前上
カバー１３の肉厚ｂが３ｍｍ程度、薄肉部１６，１６´
の肉厚ｃが１．５ｍｍ程度である。また、薄肉部１６，
１６´の長さｄは３ｍｍ程度であるが、それよりも長く
ても短くても差し支えない。In order to solve such a problem, the present invention takes the following measures. In FIG. 2, ribs 14 and 1
In 4 ', thin-walled portions 16 and 16' having a wall thickness c and thick-walled portions 17 and 17 'are sequentially formed in the direction away from the front upper cover 13. That is, the thin portions 16, 16 'are formed at the roots of the ribs 14, 14'.
When the predetermined length d of 16 'is exceeded, the rib thickness a is equal to or greater than the wall thickness b of the front upper cover 13
It becomes 7,17 '. The thickness c of the thin portions 16 and 16 ′ is set to be smaller than the thickness b of the front upper cover 13. In this case, the thickness c of the thin portions 16, 16 ′ is preferably about ½ to ⅔ of the thickness b of the front upper cover 13, and if the thickness is less than ½, the strength becomes too weak. If it is thicker than two-thirds, the front upper cover 13 will be sinked. In the present embodiment, the rib thickness a and the thickness b of the front upper cover 13 are about 3 mm, and the thin portions 16 and 16 '.
Has a thickness c of about 1.5 mm. Also, the thin portion 16,
The length d of 16 'is about 3 mm, but it may be longer or shorter than that.
【００１６】かく構成の前上カバー１３は、リブ１４，
１４´の根元に薄肉部１６，１６´を設け、この薄肉部
１６，１６´の肉厚ｃを前上カバー１３の肉厚ｂよりも
薄くしたことにより、上記ヒケが前上カバー１３の外側
面に発生しない。従って、前上カバー１３には良好な外
観品質が得られる。また、薄肉部１６，１６´に続いて
厚肉部１７，１７´を設けていることにより、給紙ロー
ラ７ａを支持するための十分な強度も得られる。The front upper cover 13 having the above structure is provided with ribs 14,
By providing thin portions 16 and 16 ′ at the base of 14 ′ and making the thickness c of the thin portions 16 and 16 ′ smaller than the thickness b of the front upper cover 13, the sink mark is outside the front upper cover 13. Does not occur on the side. Therefore, the front upper cover 13 has a good appearance quality. Further, since the thin portions 16 and 16 'are followed by the thick portions 17 and 17', sufficient strength for supporting the sheet feeding roller 7a can be obtained.
【００１７】図３は、薄肉部１６，１６´を形成するた
めの射出形成金型の一部分を示すもので、符号１８はス
ライド駒であり、スライド駒１８は矢印Ｐ方向に離型さ
れる。本例では、薄肉部１６，１６´を形成する金型の
抜き方向は外側となっているが、傾斜角ブロック等を使
用することにより、内側へも肉抜きすることは可能であ
る。FIG. 3 shows a part of an injection molding die for forming the thin portions 16, 16 '. Reference numeral 18 is a slide piece, and the slide piece 18 is released in the arrow P direction. In this example, the die for forming the thin-walled portions 16 and 16 ′ is on the outer side, but it is also possible to lean on the inner side by using an inclined block or the like.
【００１８】ところで、リブ１４，１４´の根元部分に
薄肉部１６，１６´を設けると、前上カバー１３とリブ
１４，１４´の接合部の強度が不足することも起り得
る。そこで、リブ１４，１４´の根元に強度が必要な場
合には図４に示すように、リブ１４，１４´の厚肉部１
７，１７´から薄肉部１６，１６´をまたがって前上カ
バー１３に達する三角形の薄板上の補強リブ１９を設け
る。この補強リブ１９は必要とする強度に応じて１枚以
上、何枚設けても良く、その間隔も任意である。If the thin portions 16, 16 'are provided at the roots of the ribs 14, 14', the strength of the joint between the front upper cover 13 and the ribs 14, 14 'may be insufficient. Therefore, when strength is required at the roots of the ribs 14 and 14 ', as shown in FIG.
Reinforcing ribs 19 on a thin triangular plate extending from 7, 17 'to the front upper cover 13 across the thin portions 16, 16' are provided. One or more reinforcing ribs 19 may be provided depending on the required strength, and the spacing between them may be arbitrary.
【００１９】図５は、前上カバー１３に設けられたコネ
クタ２０を支持するためのリブ２１を示している。この
リブ２１においても肉厚ｃの薄肉部２２，２３と、肉厚
ａの厚肉部２４，２４´が形成され、前上カバー１３の
外側面にヒケが生ずることも防止している。この場合、
薄肉部２２は上記薄肉部１６，１６´とほぼ同様の形態
にすることができるが、薄肉部２３は肉抜きが困難であ
るため、図における垂直部分全体を薄肉部２３として対
処している。FIG. 5 shows ribs 21 provided on the front upper cover 13 for supporting the connector 20. Also in this rib 21, thin portions 22 and 23 having a thickness c and thick portions 24 and 24 ′ having a thickness a are formed to prevent sink marks on the outer surface of the front upper cover 13. in this case,
The thin portion 22 can be formed in substantially the same form as the thin portions 16 and 16 ', but it is difficult to thin the thin portion 23, and therefore the entire vertical portion in the drawing is dealt with as the thin portion 23.
【００２０】かく構成した前上カバー１３も、リブ２１
の根元に薄肉部２２，２３を設け、この薄肉部２２，２
３の肉厚ｃを前上カバー１３の肉厚ｂよりも薄くしたこ
とにより、ヒケの発生を防止できる。The front upper cover 13 thus constructed also has ribs 21.
The thin portions 22, 23 are provided at the base of the
By making the thickness c of 3 smaller than the thickness b of the front upper cover 13, it is possible to prevent the occurrence of sink marks.
【００２１】[0021]
【発明の効果】請求項１によれば、薄肉部の肉厚がカバ
ー部材の肉厚よりも薄くしたので、カバー部材の外側面
にヒケが発生せず、またリブには薄肉部に続いて厚肉部
を設けているので、リブでローラ等の部材を支持するた
めの充分な強度が得られる。請求項２によれば、補強リ
ブによって薄肉部の強度が増し、リブ自体の強度を確保
できる。According to the first aspect of the present invention, since the thickness of the thin portion is smaller than the thickness of the cover member, sink marks are not generated on the outer side surface of the cover member, and the ribs are connected to the thin portion. Since the thick portion is provided, sufficient strength for supporting members such as rollers by the ribs can be obtained. According to claim 2, the reinforcing rib increases the strength of the thin portion, and the strength of the rib itself can be secured.
【図１】図１はカバーの１つに本発明に係るリブ付きハ
ウジングが用いられたレザープリンタの概略図である。FIG. 1 is a schematic view of a leather printer in which a ribbed housing according to the present invention is used for one of covers.
【図２】図２は本発明の一実施例を示す断面図である。FIG. 2 is a sectional view showing an embodiment of the present invention.
【図３】図３は薄肉部を形成するための射出形成金型の
一部分を示す説明図である。FIG. 3 is an explanatory view showing a part of an injection molding die for forming a thin portion.
【図４】図４（ａ），（ｂ）は本発明の変形例を示す断
面図および側面図である。4A and 4B are a sectional view and a side view showing a modified example of the present invention.
【図５】図５は本発明の別の実施例を示す断面図であ
る。FIG. 5 is a sectional view showing another embodiment of the present invention.
【図６】図６は従来のリブ付きハウジングを示す断面図
である。FIG. 6 is a cross-sectional view showing a conventional ribbed housing.
【図７】図７は従来のヒケ防止対策をしたカバーを示す
断面図である。FIG. 7 is a cross-sectional view showing a conventional cover having a sink preventive measure.
【図８】図８は従来の図７と異なるヒケ防止対策をした
カバーを示す断面図である。FIG. 8 is a cross-sectional view showing a cover having a sink preventive measure different from the conventional FIG.
１３ 前上カバー １４，１４´，２１ リブ １６，１６´，２２，２３ 薄肉部 １７，１７´，２４，２４´ 厚肉部 １１，２０ ソレノイド １９ 補強リブ 13 front upper cover 14,14 ', 21 rib 16,16', 22,23 thin part 17,17 ', 24,24' thick part 11,20 solenoid 19 reinforcing rib
Claims (2)
要求され、その内面側にリブが形成される射出成形品の
リブ付きハウジングにおいて、 前記リブに、前記カバー部材から離れる方向にしたがっ
て所定長さの薄肉部と該薄肉部の肉厚よりも厚い肉厚の
厚肉部とが順次形成され、前記薄肉部の肉厚が前記カバ
ー部材の肉厚よりも薄いことを特徴とするリブ付きハウ
ジング。1. A ribbed housing of an injection-molded product, which is required to have an appropriate appearance quality on the outer surface side of the cover member and has ribs formed on the inner surface side thereof. With a rib characterized in that a thin portion having a length and a thick portion having a thickness larger than that of the thin portion are sequentially formed, and the thickness of the thin portion is thinner than the thickness of the cover member. housing.
またがってリブの厚肉部まで達する補強リブを設けたこ
とを特徴とする請求項１に記載のリブ付きハウジング。2. The ribbed housing according to claim 1, further comprising a reinforcing rib extending from the cover member to a thick portion of the rib across a thin portion of the rib.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3208126A JPH0550474A (en) | 1991-08-20 | 1991-08-20 | Ribbed housing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3208126A JPH0550474A (en) | 1991-08-20 | 1991-08-20 | Ribbed housing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0550474A true JPH0550474A (en) | 1993-03-02 |
Family
ID=16551073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3208126A Pending JPH0550474A (en) | 1991-08-20 | 1991-08-20 | Ribbed housing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0550474A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009251426A (en) * | 2008-04-09 | 2009-10-29 | Murata Mach Ltd | Electronic apparatus |
| WO2014014403A1 (en) * | 2012-07-18 | 2014-01-23 | Scania Cv Ab | Vehicle panel portion designed to avoid indentations |
| JP2016043567A (en) * | 2014-08-22 | 2016-04-04 | 三菱電機株式会社 | Metallic resin molding and method for producing the metallic resin molding |
| US9751240B2 (en) | 2013-01-15 | 2017-09-05 | Toyota Shatai Kabushiki Kaisha | Resin vehicle part manufacturing method and resin vehicle part |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS576515U (en) * | 1980-06-13 | 1982-01-13 | ||
| JPS5961579U (en) * | 1982-10-15 | 1984-04-23 | 松下電器産業株式会社 | housing |
| JPS59162217U (en) * | 1983-04-15 | 1984-10-30 | トヨタ自動車株式会社 | injection mold |
-
1991
- 1991-08-20 JP JP3208126A patent/JPH0550474A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS576515U (en) * | 1980-06-13 | 1982-01-13 | ||
| JPS5961579U (en) * | 1982-10-15 | 1984-04-23 | 松下電器産業株式会社 | housing |
| JPS59162217U (en) * | 1983-04-15 | 1984-10-30 | トヨタ自動車株式会社 | injection mold |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009251426A (en) * | 2008-04-09 | 2009-10-29 | Murata Mach Ltd | Electronic apparatus |
| WO2014014403A1 (en) * | 2012-07-18 | 2014-01-23 | Scania Cv Ab | Vehicle panel portion designed to avoid indentations |
| US9751240B2 (en) | 2013-01-15 | 2017-09-05 | Toyota Shatai Kabushiki Kaisha | Resin vehicle part manufacturing method and resin vehicle part |
| JP2016043567A (en) * | 2014-08-22 | 2016-04-04 | 三菱電機株式会社 | Metallic resin molding and method for producing the metallic resin molding |
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