JP4035965B2

JP4035965B2 - Lid molding equipment

Info

Publication number: JP4035965B2
Application number: JP2001147980A
Authority: JP
Inventors: 誠山口; 淳佐田
Original assignee: Toppan Inc
Current assignee: Toppan Inc
Priority date: 2001-05-17
Filing date: 2001-05-17
Publication date: 2008-01-23
Anticipated expiration: 2021-05-17
Also published as: JP2002337255A

Description

【０００１】
【発明の属する技術分野】
この発明は、シート材料から、所定の形状の平坦部と上記平坦部の周辺から上記平坦部の表面に対し交差する所定の方向に向かい折り曲げられた周辺折り曲げ部とを備えており筒状の容器本体の端部開口に挿入されて上記平坦部で上記端部開口を閉塞するとともに上記周辺折り曲げ部で上記端部開口の内周面に支持される蓋材を成形するための蓋材成形装置に関係している。
【０００２】
【従来の技術】
従来の上述した如き蓋材成形装置は：
上記蓋材の上記平坦部の上記所定の形状に対応した所定の形状の内周面を有する開口が形成され上記シート材料が載置される材料載置表面を有している雌金型と；そして、
上記蓋材の上記平坦部の上記所定の形状に対応した所定の形状の外周面と、上記雌金型の上記材料載置表面上に載置されている上記シート材料に接触する接触表面と、を有していて、上記接触表面を上記シート材料に接触させた状態で上記シート材料を上記雌金型の上記材料載置表面の上記開口中に押し込む雄金型と；
を備えている。
【０００３】
このような従来の蓋材成形装置においては、上記シート材料において上記雄金型の接触表面に接触された部分が上記蓋材における上記所定の形状の平坦部になり、また上記シート材料において上記雌金型の上記開口中で上記開口の内周面と上記雄金型の上記外周面との間に挟まれる部分が上記周辺折り曲げ部になる。
【０００４】
【発明が解決しようとする課題】
上述した如き従来の蓋材成形装置により形成された従来の蓋材は、上記平坦部において上記周辺折り曲げ部が折り曲げられた側の表面と上記周辺折り曲げ部において上記平坦部と対面する側の表面との間の境界線に沿い多数の皺が発生している。
【０００５】
また、上記蓋部材の上記平坦部の上記所定の形状が例えば４角形状の如き段付部位を有した形状の場合、上記周辺折り曲げ部において上記平坦部の上記段付部位に対応する位置に皺が発生している。
【０００６】
さらに上記蓋材が積層構造の場合には、上記皺に混じり表層の破れや複数の層間に空洞が生じることもある。
【０００７】
この発明は上記事情の下で為され、この発明の目的は、シート材料から、所定の形状の平坦部と上記平坦部の周辺から上記平坦部の表面に対し交差する所定の方向に向かい折り曲げられた周辺折り曲げ部とを備えており筒状の容器本体の端部開口に挿入されて上記平坦部で上記端部開口を閉塞するとともに上記周辺折り曲げ部で上記端部開口の内周面に支持される蓋材を成形するための蓋材成形装置であって、上記蓋部材の上記平坦部の上記所定の形状が例えば４角形状の如き段付部位を有した形状の場合であっても、上記平坦部において上記周辺折り曲げ部が折り曲げられた側の表面と上記周辺折り曲げ部において上記平坦部と対面する側の表面との間の境界線に沿い、あるいは上記周辺折り曲げ部において上記平坦部の上記段付部位に対応する位置に、皺を発生させることが無く、さらには、上記蓋材が積層構造の場合でも、上記皺を発生させず上記皺に混じる表層の破れや複数の層間に空洞を生じさせることがない、蓋材成形装置を提供することである。
【０００８】
【課題を解決するための手段】
上述したこの発明の目的を達成する為に、この発明に従った蓋材成形装置は、シート材料から、凸部又は凹部となる段付部位を含んでいる所定の形状の平坦部と上記平坦部の周辺から上記平坦部の表面に対し交差する所定の方向に向かい折り曲げられた周辺折り曲げ部とを備えており筒状の容器本体の端部開口に挿入されて上記平坦部で上記端部開口を閉塞するとともに上記周辺折り曲げ部で上記端部開口の内周面に支持される蓋材を成形するための装置であって：
上記蓋材の上記平坦部の上記所定の形状に対応した所定の形状の内周面を有する開口が形成され上記シート材料が載置される材料載置表面を有していて、上記開口の入口縁が面取りされている雌金型と；
上記雌金型の上記材料載置表面の上記開口の入口縁よりも大きな縁を有した開口が形成されていて、上記開口を上記雌金型の上記材料載置表面の上記開口の入口縁に対応させた状態で上記雌金型の上記材料載置表面上に載置された上記シート材料を上記材料載置表面上に押圧するシート材料押えと；そして、
上記蓋材の上記平坦部の上記所定の形状に対応していて凸部又は凹部となる段付部位を含んでいる所定の形状の外周面と、上記雌金型の上記材料載置表面に載置され上記シート材料押えにより上記材料載置表面上に押圧されている上記シート材料に接触する接触表面と、を有していて、上記外周面と上記接触表面との境界縁が面取りされており、上記外周面は少なくとも上記段付部位が上記蓋材の上記周辺折り曲げ部の折り曲げ長さよりも短い距離だけ上記接触表面から離れた位置からさらに上記接触表面に対し遠ざかるにつれて上記接触表面に沿った内方に傾斜されており、上記接触表面を上記シート材料に接触させた状態で上記シート材料を上記雌金型の上記材料載置表面の上記開口中に上記入口縁を介して押し込む、雄金型と；
を備えており、上記雌金型の上記材料載置表面上に載置された上記シート材料が上記雄金型により上記雌金型の上記材料載置表面の上記開口中に押し込まれる間には、上記シート材料において上記雄金型により上記雌金型の上記材料載置表面の上記開口中に押し込まれる部分と上記雌金型の上記材料載置表面上に上記シート材料押えにより押圧されている部分との間に引張り力が生じる、ことを特徴としている。
【０００９】
このように構成されたことを特徴としているこの発明に従った蓋材成形装置によれば、雌金型の材料載置表面上にシート材料が載置されると、シート材料押えが雌金型の材料載置表面の開口の入口縁よりも大きな縁を有した開口を雌金型の材料載置表面の開口の入口縁に対応させた状態で雌金型の材料載置表面上に載置されたシート材料を材料載置表面上に押圧する。
【００１０】
次に、蓋材の平坦部の所定の形状に対応した所定の形状の外周面と、雌金型の材料載置表面に載置されシート材料押えにより材料載置表面上に押圧されているシート材料に接触する接触表面と、を有していて、外周面と接触表面との境界縁が面取りされている雄金型が、接触表面を上記シート材料に接触させた状態でシート材料を雌金型の材料載置表面の開口中に入口縁を介して押し込む。
【００１１】
これにより、シート材料において雄金型の接触表面に接触した部分が上記所定の形状を有した平坦部となり、シート材料において雄金型の接触表面からはみ出した部分が雌金型の材料載置表面の開口の入口縁、即ち上記平坦部の周辺、において雌金型の上記開口中に引き込まれ上記開口の内周面に沿い上記平坦部の周辺から上記平坦部の表面に対し交差する所定の方向に向かい、即ち上記開口の入口縁に向かい、折り曲げられた周辺折り曲げ部となる。
【００１２】
なお、雌金型の材料載置表面上に載置されたシート材料が雄金型により雌金型の材料載置表面の開口中に押し込まれる間には、シート材料において雄金型により雌金型の材料載置表面の開口中に押し込まれる部分と雌金型の材料載置表面上にシート材料押えにより押圧されている部分との間に引張り力が生じる。
【００１３】
そして、雌金型の材料載置表面の開口の入口縁が面取りされているとともに雄金型の外周面と接触表面との境界縁が面取りされているので、上記引張り力はシート材料において雄金型の接触表面からはみ出した部分の全体に略均一に広がり、上記蓋部材の上記平坦部の上記所定の形状が例えば４角形状の如き段付部位を有した形状の場合であっても、上記平坦部において上記周辺折り曲げ部が折り曲げられた側の表面と上記周辺折り曲げ部において上記平坦部と対面する側の表面との間の境界線に沿い皺を発生させることが無く、さらには、上記蓋材が積層構造の場合でも、上記皺を発生させず上記皺に混じる表層の破れや複数の層間に空洞を生じさせることがない。
【００１４】
また、雄金型の外周面における少なくとも段付部位が上記蓋材の上記周辺折り曲げ部の折り曲げ長さよりも短い距離だけ上記接触表面から離れた位置からさらに上記接触表面に対し遠ざかるにつれて上記接触表面に沿った内方に傾斜されているので、上記引張り力が上記シート材料において雄金型の接触表面からはみ出した部分中で上記段付部位に対応する位置に集中することを防止し、上記段付部位に対応する位置に皺を発生させることがなく、さらには、上記蓋材が積層構造の場合でも、上記皺を発生させず上記皺に混じる表層の破れや複数の層間に空洞を生じさせることがない。
【００１５】
上述した如く構成されたことを特徴とするこの発明に従った蓋材成形装置においては、上記所定の形状や上記所定の形状に対応した雄金型の外周面の形状は、円や楕円や、三角や四角等を含む多角形や、不定形等の任意の種々の形状であることが出来るが、凸部又は凹部となるような段付き部位を含んでいる。
【００１６】
上述した如く構成されたことを特徴とするこの発明に従った蓋材成形装置においては、上記所定の形状が多角形の場合、上記雄金型の上記外周面の上記段付部位は上記多角形の隅部となる。
【００１７】
上記多角形には四角形が含まれている。
【００１８】
上記雄金型の上記外周面は、全周に渡り、上記蓋材の上記周辺折り曲げ部の折り曲げ長さよりも短い距離だけ上記接触表面から離れた位置からさらに上記接触表面に対し遠ざかるにつれて、上記接触表面に沿った内方に傾斜されていることも出来る。
【００１９】
さらに、上記シート材料は、紙を基礎としてシート状に成形された材料であることが出来る。
【００２０】
また、上記シート材料は、積層構造であることが出来る。
【００２１】
さらにまた、上記雌金型の上記材料載置表面の上記開口の上記入口縁の上記面取りと、上記雄金型の上記外周面と上記接触表面との上記境界縁の上記面取りとが、凸状湾曲面により構成されている、ことが好ましい。
【００２２】
凸状湾曲面により構成されている上記面取りは、上記引張り力のより均一な分散を可能にし、この発明の蓋材成形装置によりシート材料から成形される蓋材に上記皺や破れや空隙が生じることをより確実に防止する。
【００２３】
以下、この発明の一実施の形態に従った蓋材成形装置を添付の図面を参照しながら詳細に説明する。
【００２４】
【発明の実施の形態】
先ず最初は、添付の図面中の図１の（Ａ）乃至（Ｃ）を参照しながら、この発明の一実施の形態に従った蓋材成形装置によりシート材料から成形された蓋材１０及びこの蓋材１０が筒状の容器１２の端部開口１２ａに適用されて端部開口１２ａを閉塞した状態を説明する。
【００２５】
なおここで：図１の（Ａ）及び（Ｂ）は、この発明の一実施の形態に従った蓋材成形装置によりシート材料から成形された蓋材１０の平面図及び側面図であり；さらに、図１の（Ｃ）は、蓋材１０が筒状の容器本体１２の端部開口１２ａに適用されて端部開口１２ａを閉塞した状態を示す部分縦断面図である。
【００２６】
蓋材１０は、後述するこの発明の一実施の形態に従った蓋材成形装置によりシート材料から成形されており、図１の（Ａ）及び（Ｂ）中に示されている如く、所定の形状の平坦部１０ａと、平坦部１０ａの周辺から平坦部１０ａの表面に対し交差する所定の方向に向かい折り曲げられた周辺折り曲げ部１０ｂと、を備えている。
【００２７】
シート材料は、紙を基礎にしてシート状に成形されている材料であって、積層構造であることが出来る。積層構造の場合、例えば紙の基材上にプラスチック製の防水層及び／又は金属薄膜製の気密層を備えることが出来る。
【００２８】
蓋材１０は、図１の（Ｃ）中に示されている如く、上記蓋材成形装置とは別の図示されていない成形装置により筒状に成形されている容器本体１２の端部開口１２ａに挿入される。蓋材１０の平坦部１０ａの所定の形状及び寸法は、容器本体１２の端部開口１２ａの輪郭、即ち横断面形状、の所定の形状及び寸法に略一致されている。その為、容器本体１２の端部開口１２ａに挿入された蓋材１０の平坦部１０ａは端部開口１２ａを閉塞し、周辺折り曲げ部１０ｂで端部開口１２ａの内周面に支持される。この後、蓋材１０の周辺折り曲げ部１０ｂは、公知の固定手段により端部開口１２ａの内周面に固定される。
【００２９】
なお、図１の（Ａ）から明らかなように、この実施の形態において蓋材１０の平坦部１０ａの所定の形状は段付部位を有している多角形状の一種である四角形状であって、上記多角形状においては隅部１０ｃが段付部位になっている。隅部１０ｃは蓋材１０の成形時に応力が集中して破損するのを防止する為に小さな半径の曲面で構成されている。
【００３０】
上述した如き平坦部１０ｂと周辺折り曲げ部１０ｂとを有した蓋材１０を公知の蓋材成形装置の雌金型と雄金型との組み合わせにより構成した場合には、平坦部１０ａにおいて周辺折り曲げ部１０ｂが折り曲げられた側の表面と周辺折り曲げ部１０ｂにおいて平坦部１０ａと対面する側の表面との間の境界線に沿い多数の皺が発生しているし、蓋材１０の平坦部１０ａの所定の形状がこの実施の形態の場合のように段付部位を有した多角形状の一種である例えば略四角形状の場合、周辺折り曲げ部１０ｂにおいて平坦部１０ａの段付部位である隅部１０ｃに対応する位置に皺が発生している。
【００３１】
さらに蓋材１０が積層構造の場合には、上記皺に混じり表層の破れや複数の層間に空洞が生じることもある。
【００３２】
しかしながら、蓋材１０を、シート材料から後述するこの発明の一実施の形態に従った蓋材成形装置により作成した場合には、上述した如き皺や破れや空洞が発生しない。
【００３３】
次には、添付の図面中の図２乃至図４を参照しながら、この発明の一実施の形態に従った蓋材成形装置、及びこの蓋材成形装置によりシート材料から図１の（Ａ）及び（Ｂ）中に示されている如き平坦部１０ａと周辺折り曲げ部１０ｂとを備えた蓋材１０を成形する工程を説明する。
【００３４】
先ずは、この発明の一実施の形態に従った蓋材成形装置の構成部材である雌金型１４及びこれと供に使用されるシート材料押え１６の構成を図２の（Ａ）及び（Ｂ）を参照しながら詳細に説明するが：図２の（Ａ）は、この発明の一実施の形態に従った蓋材成形装置の構成部材である雌金型１４及びシート材料押え１６の概略的な平面図であり；そして、図２の（Ｂ）は、図２の（Ａ）の雌金型１４及びシート材料押え１６のＢ−Ｂ線に沿った概略的な縦断面である。
【００３５】
雌金型１４は、蓋材１０の為の図示されていないシート材料が載置される平坦な材料載置表面１４ａを有していて、材料載置表面１４ａには蓋材１０の平坦部１０ａの所定の形状に対応した所定の形状の内周面１４ｂを有する開口１４ｃが形成されている。詳細には、内周面１４ｂの所定の形状と寸法は、図１の（Ａ）及び（Ｂ）中の蓋材１０の平坦部１０ａにおいて周辺折り曲げ部１０ｂが折り曲げられていない側の表面（即ち、内側表面）の所定の形状と寸法に略一致されている。雌金型１４の材料載置表面１４ａの開口１４ｃの入口縁１４ｄは面取りされている。そして、この実施の形態では、入口縁１４ｄの面取りは凸状湾曲面により構成されている。
【００３６】
雌金型１４は、固定螺子挿入孔１４ｅ中に挿入された図示しない固定螺子により、この実施の形態の蓋材成形装置が設置される図示しない作業場の図示しない所定の位置に固定される。
【００３７】
シート材料押え１６には雌金型１４の材料載置表面１４ａの開口１４ｃの入口縁１４ｄよりも大きな縁１６ａを有した開口が形成されている。シート材料押え１６は、図２の（Ｂ）中に示されている如く雌金型１４の材料載置表面１４ａから離間した所定の開放位置と、雌金型１４の材料載置表面１４ａ上に図１の（Ａ）及び（Ｂ）中の蓋材１０の為の図示されていないシート材料が載置された後に自身の上記開口を雌金型１４の材料載置表面１４ａの開口１４ｃの入口縁１４ｄに対応させた状態で雌金型１４の材料載置表面１４ａ上に載置された上記シート材料に押し当てられ上記シート材料を材料載置表面１４ａ上に押圧する所定の押圧位置と、の間で移動可能である。
【００３８】
次には、この発明の一実施の形態に従った蓋材成形装置の構成部材の別の１つであり雌金型１４やシート材料押え１６と組み合わされて使用される雄金型１８の構成を図３の（Ａ）乃至（Ｄ）を参照しながら詳細に説明するが：図３の（Ａ）は、この発明の一実施の形態に従った蓋材成形装置の構成部材の別の１つである雄金型１８の概略的な平面図であり；図３の（Ｂ）は、図３の（Ａ）の雄金型１８の概略的な側面図であり；図３の（Ｃ）は、図３の（Ａ）の雄金型１８において参照符合Ｃにより指摘されている２点鎖線で囲まれた部分の概略的な拡大平面図であり；そして図３の（Ｄ）は、図３の（Ｃ）に拡大して示されている部分を矢印Ｄの方向から見た概略的な拡大側面図である。
【００３９】
雄金型１８は、蓋材１０の平坦部１０ａの上記所定の形状に対応した所定の形状の外周面１８ａと、図２中の雌金型１４の材料載置表面１４ａに載置されシート材料押え１６により材料載置表面１４ａ上に押圧されている図示されていない上記シート材料に接触する接触表面１８ｂと、を有している。詳細には、外周面１８ａの上記所定の形状と寸法は、図１の（Ａ）及び（Ｂ）中に蓋材１０の平坦部１０ａにおいて周辺折り曲げ部１０ｂが折り曲げられている側の表面（即ち、外側表面）の所定の形状と寸法に略一致されている。
【００４０】
外周面１８ａと接触表面１８ｂとの境界縁１８ｃが面取りされており、この実施の形態では、境界縁１８ｃの面取りは凸状湾曲面により構成されている。
【００４１】
外周面１８ａにおける少なくとも段付部位（隅部）１８ｄは、蓋材１０の周辺折り曲げ部１０ｂの折り曲げ長さＢＬよりも短い距離だけ接触表面１８ｂから離れた位置Ｐからさらに接触表面１８ｂに対し遠ざかるにつれて、接触表面１８ｂに沿った内方に所定の角度αだけ傾斜されている。なお、外周面１８ａにおける少なくとも段付部位（隅部）１８ｄは、接触表面１８ｂから位置Ｐまでの間は、面取りされている境界縁１８ｃを除き接触表面１８ｂに対し直交する実質的な直線により構成されている。
【００４２】
雄金型１８の平面の中心には連結孔１８ｅが形成されている。連結孔１８ｅには、上記図示しない作業場における上記図示しない所定の位置に固定されている雌金型１４の材料載置表面１４ａの開口１４ｃに対応して雄金型１８を支持し、雌金型１４の材料載置表面１４ａの開口１４ｃの上方に雄金型１８を配置した離間位置と開口１４ｃ中に雄金型１８を所定の深さまで挿入した挿入位置との間で往復移動させる公知の図示しない往復移動装置の往復移動部材の端部が連結される。
【００４３】
次には、添付の図面中の図４の（Ａ）及び（Ｂ）を参照しながら、図２及び図３を参照しながら説明した雌金型１４，シート材料押え１６，そして雄金型１８が相互に組み合わされて構成された本願の発明の一実施の形態に従った蓋材成形装置によりシート材料から図１の（Ａ）及び（Ｂ）中に示されている蓋材１０が成形される工程を説明する。
【００４４】
なおここで、図４の（Ａ）は、本願の発明の一実施の形態に従った蓋材成形装置によりシート材料から蓋材１０を形成する直前の工程を概略的に示す縦断面図であり；そして図４の（Ｂ）は、本願の発明の一実施の形態に従った蓋材成形装置によりシート材料から蓋材１０が成形された直後の工程を概略的に示す縦断面図である。
【００４５】
本願の発明の一実施の形態に従った蓋材成形装置により図１の（Ａ）及び（Ｂ）中に示されている蓋材１０へと成形されるシート材料の素材２０が、上記蓋材成形装置における成形工程とは独立して準備されている。素材２０は、材料載置表面１４ａの開口１４ｃの上記所定の形状に対応した所定の形状（即ち、この実施の形態では、四隅が丸められた四角形状）を有しており、開口１４ｃの上記所定の形状の寸法はもとよりシート材料押え１６の開口の縁１６ａの上記所定の形状の寸法よりも大きな寸法に設定されている。
【００４６】
上記蓋材成形装置において雄金型１８が、前述した如く上記図示されていない作業場における上記図示されていない所定の位置に固定されている雌金型１４の材料載置表面１４ａの開口１４ｃから離間されているとともに、シート材料押え１６が、雌金型１４の材料載置表面１４ａ上から離間されている間に、素材２０は、材料載置表面１４ａ上に載置される。
【００４７】
この時、素材２０は、材料載置表面１４ａの開口１４ｃに対し、開口１４ｃの上記所定の形状に対応させて（即ち、この実施の形態では、開口１４ｃの上記所定の形状の段付部位である四隅に素材２０の上記所定の形状の段付部位である四隅を対応させて）同心的に配置される。
【００４８】
次に、雌金型１４の材料載置表面１４ａ上に上述した如く載置されたシート材料の素材２０を、図４の（Ａ）中に示されている如く、シート材料押え１６により押圧する。この時、シート材料押え１６は、材料載置表面１４ａの開口１４ｃに対し、開口１４ｃの上記所定の形状に対応させて（即ち、この実施の形態では、開口１４ｃの上記所定の形状の段付部位である四隅にシート材料押え１６の開口の縁１６ａの上記所定の形状の段付部位である四隅を対応させて）同心的に配置される。
【００４９】
この状態が、図４の（Ａ）中に示されている。
【００５０】
図４の（Ａ）中には、雄金型１８を、図４の（Ａ）中に示されている離間位置と前述した如く雌金型１４の材料載置表面１４ａの開口１４ｃ中に所定の深さまで挿入した挿入位置との間で往復移動させる公知の図示しない往復移動装置の往復移動部材の端部が参照符合２２により指摘されている。
【００５１】
次に雄金型１８が、上記図示しない往復移動装置により、シート材料押え１６の開口を介して雌金型１４の材料載置表面１４ａ上のシート材料２０に接触表面１８ｂを接触させて押圧する。この時、雄金型１８は、材料載置表面１４ａの開口１４ｃに対し、開口１４ｃの上記所定の形状に対応させて（即ち、この実施の形態では、開口１４ｃの上記所定の形状の段付部位である四隅に雄金型１８の接触表面１８ｂの上記所定の形状の段付部位である四隅を対応させて）同心的に配置される。
【００５２】
上記図示しない往復移動装置により雄金型１８がさらに押圧されると、雄金型１８は、シート材料２０に接触表面１８ｂを接触させた状態でシート材料２０を材料載置表面１４ａの開口１４ｃ中に入口縁１４ｄを介して押し込む。
【００５３】
これにより、シート材料の素材２０において雄金型１８の接触表面１８ａに接触した部分が蓋材１０の上記所定の形状を有した平坦部１０ａとなり、シート材料の素材２０において雄金型１８の接触表面１８ａからはみ出した部分が雌金型１４の材料載置表面１４ａの開口１４ｃの入口縁１４ｄ、即ち平坦部１０ａの周辺、において雌金型１４の開口１４ｃ中に引き込まれ開口１４ｃの内周面１４ｂと開口１４ｃ中の雄金型１８の外周面１８ａとに挟持された状態で開口１４ｃの内周面１４ｂに沿い平坦部１０ａの周辺から平坦部１０ａの表面に対し交差する所定の方向に向かい、即ち開口１４ｃの入口縁１４ｄに向かい、折り曲げられた周辺折り曲げ部１０ｂとなる。
【００５４】
この状態が、図４の（Ｂ）中に示されており、図１の（Ａ）及び（Ｂ）中に示されている蓋材１０が成形されている。
【００５５】
上述した如く、雌金型１４の材料載置表面１４ａ上に載置されたシート材料の素材２０が雄金型１８により雌金型１４の材料載置表面１４ａの開口１４ｃ中に押し込まれる間には、シート材料の素材２０において雄金型１８により雌金型１４の材料載置表面１４ａの開口１４ｃ中に押し込まれる部分と雌金型１４の材料載置表面１４ａ上にシート材料押え１６により押圧されている部分との間に引張り力が生じる。
【００５６】
そして、雌金型１４の材料載置表面１４ａの開口１４ｃの入口縁１４ｄが面取りされているとともに雄金型１８の外周面１８ｂと接触表面１８ａとの境界縁１８ｃが面取りされているので、上記引張り力はシート材料の素材２０において雄金型１８の接触表面１８ａからはみ出した部分の全体に略均一に広がり、蓋部材１０の平坦部１０ａの上記所定の形状が例えば４角形状の如き段付部位を有した形状の場合であっても、平坦部１０ａにおいて周辺折り曲げ部１０ｂが折り曲げられた側の表面（外側表面）と周辺折り曲げ部１０ｂにおいて平坦部１０ａと対面する側の表面との間の境界線に沿い皺を発生させることが無く、さらには、蓋材１０が積層構造の場合でも、上記皺を発生させず上記皺に混じる表層の破れや複数の層間に空洞を生じさせることがない。
【００５７】
また、雄金型１８の外周面１８ｂにおける少なくとも段付部位（この実施の形態では隅部）１８ｄが、蓋材１０の周辺折り曲げ部１０ｂの折り曲げ長さＢＬよりも短い距離だけ接触表面１８ｂから離れた位置Ｐまでは面取りされている境界縁１８ｃを除き接触表面１８ｂに対し直交する実質的な直線であるとともに、さらには上記位置Ｐから接触表面１８ｂに対しさらに遠ざかるにつれて、接触表面１８ａに沿った内方に角度αだけ傾斜されているので、上記引張り力がシート材料の素材２０において雄金型１８の接触表面１８ａからはみ出した部分中で上記段付部位に対応する位置に集中することを防止し、上記段付部位１８ｄに対応する位置に皺を発生させることがなく、さらには、蓋材１０が積層構造の場合でも、上記皺を発生させず上記皺に混じる表層の破れや複数の層間に空洞を生じさせることがない。
【００５８】
上述した如くしてシート材料の素材２０から成形された後の蓋材１０は、雄金型１８が雌金型１４の材料載置表面１４ａの開口１４ｃ中に所定の深さまで到達すると、周辺折り曲げ部１０ｂの先端が雌金型１４の開口１４ｃから抜け出し、その後に蓋材１０は、図１の（Ｃ）中に示されている如く筒状の容器１２の端部開口に挿入され上記端部開口を閉塞する為の工程へと送られる。
【００５９】
なお上述した実施の形態では、雄金型１８の外周面１８ａにおいて少なくとも段付部位（上述した実施の形態では隅部）１８ｄが、蓋材１０の周辺折り曲げ部１０ｂの折り曲げ長さＢＬよりも短い距離だけ接触表面１８ｂから離れた位置Ｐまでは、面取りされている境界縁１８ｃを除き接触表面１８ｂに対し直交する実質的な直線であるとともに、さらには上記位置Ｐから接触表面１８ｂに対しさらに遠ざかるにつれて、接触表面１８ａに沿った内方に角度αだけ傾斜されていた。しかしながら、外周面１８ａの全周に渡り、蓋材１０の周辺折り曲げ部１０ｂの折り曲げ長さＢＬよりも短い距離だけ接触表面１８ｂから離れた位置Ｐまでは、面取りされている境界縁１８ｃを除き接触表面１８ｂに対し直交する実質的な直線であるとともに、さらには上記位置Ｐから接触表面１８ｂに対しさらに遠ざかるにつれて、接触表面１８ａに沿った内方に角度αだけ傾斜されているように構成しても、上述した実施の形態の雄金型１８と同様な効果を得ることが出来る。
【００６０】
また上述した実施の形態においては、蓋材１０の平坦部１０ａの所定の形状及びこの所定の形状に対応した雄金型１８の外周面１８ａの形状は、実質的な四角形状であって隅部１０ｃが段付き部位となっているが、本願の発明の理念に従えば、円や楕円や、四角形状以外の多角形や、不定形等の任意の種々の形状であることが出来るが、凸部又は凹部となるような段付き部位を含んでいる。
【００６１】
【発明の効果】
以上詳述したことから明らかなように、この発明に従った蓋材成形装置によれば、シート材料から、所定の形状の平坦部と上記平坦部の周辺から上記平坦部の表面に対し交差する所定の方向に向かい折り曲げられた周辺折り曲げ部とを備えており筒状の容器本体の端部開口に挿入されて上記平坦部で上記端部開口を閉塞するとともに上記周辺折り曲げ部で上記端部開口の内周面に支持される蓋材を成形するための蓋材成形装置であるが、上記蓋部材の上記平坦部の上記所定の形状が例えば４角形状の如き段付部位を有した形状の場合であっても、上記平坦部において上記周辺折り曲げ部が折り曲げられた側の表面と上記周辺折り曲げ部において上記平坦部と対面する側の表面との間の境界線に沿い、あるいは上記周辺折り曲げ部において上記平坦部の上記段付部位に対応する位置に、皺を発生させることが無く、さらには、上記蓋材が積層構造の場合でも、上記皺を発生させず上記皺に混じる表層の破れや複数の層間に空洞を生じさせることがない。
【図面の簡単な説明】
【図１】図１の（Ａ）は、この発明の一実施の形態に従った蓋材成形装置によりシート材料から成形された蓋材の平面図であり；
図１の（Ｂ）は、この発明の一実施の形態に従った蓋材成形装置によりシート材料から成形された蓋材の側面図であり；そして、
図１の（Ｃ）は、蓋材が筒状の容器本体の端部開口に適用されて端部開口を閉塞した状態を示す部分縦断面図である。
【図２】図２の（Ａ）は、この発明の一実施の形態に従った蓋材成形装置の構成部材である雌金型及びシート材料押えの概略的な平面図であり；そして、
図２の（Ｂ）は、図２の（Ａ）の雌金型及びシート材料押えのＢ−Ｂ線に沿った概略的な縦断面である。
【図３】図３の（Ａ）は、この発明の一実施の形態に従った蓋材成形装置の構成部材の別の１つである雄金型の概略的な平面図であり；
図３の（Ｂ）は、図３の（Ａ）の雄金型の概略的な側面図であり；
図３の（Ｃ）は、図３の（Ａ）の雄金型において参照符合Ｃにより指摘されている２点鎖線で囲まれた部分の概略的な拡大平面図であり；そして、
図３の（Ｄ）は、図３の（Ｃ）に拡大して示されている部分を矢印Ｄの方向から見た概略的な拡大側面図である。
【図４】図４の（Ａ）は、本願の発明の一実施の形態に従った蓋材成形装置によりシート材料から蓋材を形成する直前の工程を概略的に示す縦断面図であり；そして、
図４の（Ｂ）は、本願の発明の一実施の形態に従った蓋材成形装置によりシート材料から蓋材が成形された直後の工程を概略的に示す縦断面図である。
【符号の説明】
１０蓋材
１０ａ平坦部
１０ｂ周辺折り曲げ部
１２容器
１２ａ端部開口
１４雌金型
１４ａ材料載置表面
１４ｂ内周面
１４ｃ開口
１４ｄ入口縁
１６シート材料押え
１６ａ縁
１８雄金型
１８ａ外周面
１８ｂ接触表面
１８ｃ境界縁
１８ｄ段付部位
２０素材（シート材料）[0001]
BACKGROUND OF THE INVENTION
The present invention includes a cylindrical container having a flat portion having a predetermined shape and a peripheral bent portion bent from a periphery of the flat portion toward a predetermined direction intersecting the surface of the flat portion from a sheet material. A lid material molding apparatus for molding a lid material that is inserted into an end opening of a main body, closes the end opening at the flat portion, and is supported by an inner peripheral surface of the end opening at the peripheral bent portion. Involved.
[0002]
[Prior art]
The conventional lid forming apparatus as described above is:
A female mold having a material placement surface on which an opening having an inner peripheral surface of a predetermined shape corresponding to the predetermined shape of the flat portion of the lid member is formed and on which the sheet material is placed; And
An outer peripheral surface of a predetermined shape corresponding to the predetermined shape of the flat portion of the lid member, and a contact surface in contact with the sheet material placed on the material placement surface of the female mold, A male mold that pushes the sheet material into the opening of the material placement surface of the female mold in a state where the contact surface is in contact with the sheet material;
It has.
[0003]
In such a conventional lid material forming apparatus, a portion of the sheet material that is in contact with the contact surface of the male mold becomes a flat portion of the predetermined shape in the lid material, and the female material in the sheet material. A portion of the opening of the mold sandwiched between the inner peripheral surface of the opening and the outer peripheral surface of the male mold is the peripheral bent portion.
[0004]
[Problems to be solved by the invention]
The conventional lid material formed by the conventional lid material forming apparatus as described above includes a surface on the side where the peripheral bent portion is bent in the flat portion, and a surface on the side facing the flat portion in the peripheral bent portion. There are many folds along the boundary.
[0005]
Further, when the predetermined shape of the flat portion of the lid member is a shape having a stepped portion such as a quadrangular shape, the flat portion is positioned at a position corresponding to the stepped portion of the flat portion. Has occurred.
[0006]
Further, when the lid member has a laminated structure, it may be mixed with the ridges and the surface layer may be broken or cavities may be formed between a plurality of layers.
[0007]
The present invention has been made under the above circumstances, and an object of the present invention is to be bent from a sheet material in a predetermined direction intersecting a flat portion of a predetermined shape and the surface of the flat portion from the periphery of the flat portion. And is inserted into the end opening of the cylindrical container body so as to close the end opening with the flat portion and is supported on the inner peripheral surface of the end opening by the peripheral bending portion. Even if the predetermined shape of the flat portion of the lid member is a shape having a stepped portion such as a square shape, In the flat part, along the boundary line between the surface on the side where the peripheral bent part is bent and the surface in the peripheral bent part on the side facing the flat part, or in the peripheral bent part, the step of the flat part Pair with attached part There is no generation of wrinkles at the position where the cover is formed, and furthermore, even when the lid material has a laminated structure, the wrinkles are not generated and the surface layer mixed with the wrinkles is not torn or a cavity is not generated between a plurality of layers. It is to provide a lid forming apparatus.
[0008]
[Means for Solving the Problems]
In order to achieve the above-described object of the present invention, a lid forming apparatus according to the present invention comprises a sheet material, It includes a stepped part that becomes a convex part or a concave part. A flat portion having a predetermined shape and a peripheral bent portion bent in a predetermined direction intersecting the surface of the flat portion from the periphery of the flat portion are inserted into the end opening of the cylindrical container body. An apparatus for forming a lid member that closes the end opening with the flat portion and is supported on the inner peripheral surface of the end opening at the peripheral bent portion:
An opening having an inner peripheral surface of a predetermined shape corresponding to the predetermined shape of the flat portion of the lid member is formed and has a material placement surface on which the sheet material is placed, and an entrance of the opening A female mold with chamfered edges;
An opening having an edge larger than an entrance edge of the opening on the material placement surface of the female mold is formed, and the opening is used as an entrance edge of the opening on the material placement surface of the female mold. A sheet material presser that presses the sheet material placed on the material placement surface of the female mold in a corresponding state onto the material placement surface; and
Corresponding to the predetermined shape of the flat portion of the lid. And includes a stepped part that becomes a convex part or a concave part. An outer peripheral surface of a predetermined shape, and a contact surface that contacts the sheet material that is placed on the material placement surface of the female mold and pressed on the material placement surface by the sheet material retainer. And the boundary edge between the outer peripheral surface and the contact surface is chamfered, The outer peripheral surface is inward along the contact surface as at least the stepped portion is further away from the contact surface from a position away from the contact surface by a distance shorter than the bending length of the peripheral bent portion of the lid member. Is inclined to With the contact surface in contact with the sheet material, the sheet material is pushed into the opening of the material mounting surface of the female mold through the inlet edge. Mu , With male mold;
And while the sheet material placed on the material placement surface of the female mold is pushed into the opening of the material placement surface of the female mold by the male mold The sheet material is pressed by the male metal mold onto the material placement surface of the female mold into the opening and the material placement surface of the female mold by the sheet material presser. It is characterized in that a tensile force is generated between the portions.
[0009]
According to the lid forming apparatus according to the present invention, which is characterized by being configured as described above, when the sheet material is placed on the material placement surface of the female mold, the sheet material presser is the female mold. Placed on the material placement surface of the female mold with an opening having an edge larger than the entrance edge of the opening of the material placement surface corresponding to the entrance edge of the opening of the material placement surface of the female mold The formed sheet material is pressed onto the material placement surface.
[0010]
Next, an outer peripheral surface having a predetermined shape corresponding to a predetermined shape of the flat portion of the lid member, and a sheet placed on the material placement surface of the female mold and pressed onto the material placement surface by the sheet material presser A male die having a chamfered boundary edge between the outer peripheral surface and the contact surface, the sheet material being the female metal in a state where the contact surface is in contact with the sheet material. Push through the entrance edge into the opening in the mold material mounting surface.
[0011]
Thus, the portion of the sheet material that contacts the contact surface of the male mold becomes a flat portion having the predetermined shape, and the portion of the sheet material that protrudes from the contact surface of the male mold is the material placement surface of the female mold. A predetermined direction that is drawn into the opening of the female mold at the entrance edge of the opening of the opening, that is, around the flat portion, and intersects the surface of the flat portion from the periphery of the flat portion along the inner peripheral surface of the opening Toward the entrance edge of the opening, which is a bent portion that is bent.
[0012]
While the sheet material placed on the material placement surface of the female mold is pushed into the opening of the material placement surface of the female mold by the male mold, A tensile force is generated between a portion pushed into the opening of the material placing surface of the mold and a portion pressed by the sheet material retainer on the material placing surface of the female mold.
[0013]
Since the entrance edge of the opening of the material placement surface of the female mold is chamfered and the boundary edge between the outer peripheral surface of the male mold and the contact surface is chamfered, the tensile force is applied to the male material in the sheet material. Even when the predetermined shape of the flat part of the lid member has a stepped portion such as a quadrangular shape, it extends substantially uniformly over the entire part protruding from the contact surface of the mold. There is no wrinkle along the boundary line between the surface of the flat portion where the peripheral bent portion is bent and the surface of the peripheral bent portion facing the flat portion. Even when the material has a laminated structure, the above-mentioned wrinkles are not generated, and the surface layer mixed with the above-mentioned wrinkles is not broken and cavities are not generated between a plurality of layers.
[0014]
Further, at least the stepped portion on the outer peripheral surface of the male mold is further moved away from the contact surface by a distance shorter than the bending length of the peripheral bent portion of the lid member as the contact surface is further moved away from the contact surface. Since it is inclined inward along the line, the tensile force is prevented from concentrating at the position corresponding to the stepped portion in the portion of the sheet material that protrudes from the contact surface of the male mold. No wrinkle is generated at a position corresponding to the part, and furthermore, even when the lid member has a laminated structure, the wrinkle is not generated and the surface layer mixed with the wrinkle is torn or a cavity is formed between a plurality of layers. There is no.
[0015]
In the lid forming apparatus according to the present invention, which is configured as described above, the shape of the outer peripheral surface of the male mold corresponding to the predetermined shape or the predetermined shape is a circle, an ellipse, The shape may be any of various shapes such as a polygon including a triangle and a square, and an indeterminate shape, but includes a stepped portion that becomes a convex portion or a concave portion.
[0016]
In the lid forming apparatus according to the present invention configured as described above, when the predetermined shape is a polygon, the stepped portion of the outer peripheral surface of the male mold is the polygon. It becomes the corner.
[0017]
The polygon includes a quadrangle.
[0018]
As the outer peripheral surface of the male mold is further away from the contact surface from a position away from the contact surface by a distance shorter than the folding length of the peripheral bent portion of the lid member, the contact is made over the entire circumference. It can also be tilted inward along the surface.
[0019]
Further, the sheet material can be a material formed into a sheet shape based on paper.
[0020]
Further, the sheet material can have a laminated structure.
[0021]
Furthermore, the chamfering of the entrance edge of the opening of the material mounting surface of the female mold and the chamfering of the boundary edge between the outer peripheral surface of the male mold and the contact surface are convex. It is preferable that it is constituted by a curved surface.
[0022]
The chamfering configured by the convex curved surface enables more uniform dispersion of the tensile force, and the above-described wrinkles, tears, and voids are generated in the lid formed from the sheet material by the lid forming apparatus of the present invention. To prevent this more reliably.
[0023]
Hereinafter, a lid forming apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
First, referring to FIGS. 1A to 1C in the accompanying drawings, a lid 10 formed from a sheet material by a lid molding apparatus according to an embodiment of the present invention, and the lid 10 A state in which the lid member 10 is applied to the end opening 12a of the cylindrical container 12 to close the end opening 12a will be described.
[0025]
1A and 1B in FIG. 1 are a plan view and a side view of a lid member 10 formed from a sheet material by a lid member forming apparatus according to an embodiment of the present invention; FIG. 1C is a partial longitudinal sectional view showing a state in which the lid member 10 is applied to the end opening 12a of the cylindrical container body 12 to close the end opening 12a.
[0026]
The lid member 10 is molded from a sheet material by a lid member molding apparatus according to an embodiment of the present invention, which will be described later. As shown in FIGS. A flat portion 10a having a shape and a peripheral bent portion 10b bent from a periphery of the flat portion 10a toward a predetermined direction intersecting the surface of the flat portion 10a are provided.
[0027]
The sheet material is a material formed into a sheet shape on the basis of paper, and can be a laminated structure. In the case of a laminated structure, for example, a waterproofing layer made of plastic and / or an airtight layer made of a metal thin film can be provided on a paper substrate.
[0028]
As shown in FIG. 1C, the lid member 10 is formed in an end opening 12a of a container body 12 that is formed into a cylindrical shape by a molding device (not shown) different from the lid member molding device. Inserted into. The predetermined shape and size of the flat portion 10a of the lid member 10 are substantially matched to the predetermined shape and size of the contour of the end opening 12a of the container body 12, that is, the cross-sectional shape. Therefore, the flat portion 10a of the lid member 10 inserted into the end opening 12a of the container body 12 closes the end opening 12a and is supported on the inner peripheral surface of the end opening 12a by the peripheral bent portion 10b. Thereafter, the peripheral bent portion 10b of the lid member 10 is fixed to the inner peripheral surface of the end opening 12a by a known fixing means.
[0029]
As is clear from FIG. 1A, in this embodiment, the predetermined shape of the flat portion 10a of the lid member 10 is a rectangular shape that is a kind of polygonal shape having a stepped portion. In the polygonal shape, the corner 10c is a stepped portion. The corner portion 10c is formed of a curved surface having a small radius in order to prevent stress from being concentrated and broken when the lid member 10 is molded.
[0030]
When the lid member 10 having the flat portion 10b and the peripheral bent portion 10b as described above is configured by a combination of a female die and a male die of a known lid member forming apparatus, the peripheral bent portion is formed in the flat portion 10a. A number of wrinkles are generated along the boundary line between the surface on the side where 10b is bent and the surface on the side facing the flat portion 10a in the peripheral bent portion 10b, and a predetermined portion of the flat portion 10a of the lid member 10 is formed. In the case of a substantially square shape, for example, which is a kind of polygonal shape having a stepped portion as in the case of this embodiment, the peripheral bent portion 10b corresponds to the corner portion 10c which is a stepped portion of the flat portion 10a. There is a wrinkle at the position to be.
[0031]
Further, in the case where the lid member 10 has a laminated structure, the surface layer may be broken or cavities may be formed between a plurality of layers mixed with the above-mentioned ridges.
[0032]
However, when the lid member 10 is made from a sheet material by a lid member molding apparatus according to an embodiment of the present invention described later, no wrinkles, tears or cavities as described above are generated.
[0033]
Next, referring to FIG. 2 to FIG. 4 in the accompanying drawings, the lid material forming apparatus according to the embodiment of the present invention, and the sheet material by the lid material forming apparatus shown in FIG. And the process of shape | molding the cover material 10 provided with the flat part 10a and the periphery bending part 10b as shown in (B) is demonstrated.
[0034]
First, the structure of the female mold 14 which is a constituent member of the lid forming apparatus according to the embodiment of the present invention and the sheet material presser 16 used therewith are shown in FIGS. 2 (A) is a schematic view of a female die 14 and a sheet material presser 16 that are constituent members of a lid forming apparatus according to an embodiment of the present invention. FIG. 2B is a schematic longitudinal cross section taken along the line BB of the female mold 14 and the sheet material presser 16 of FIG. 2A.
[0035]
The female mold 14 has a flat material placement surface 14a on which a sheet material (not shown) for the lid member 10 is placed. The flat portion 10a of the lid member 10 is placed on the material placement surface 14a. An opening 14c having an inner peripheral surface 14b having a predetermined shape corresponding to the predetermined shape is formed. Specifically, the predetermined shape and dimensions of the inner peripheral surface 14b are determined by the surface of the flat portion 10a of the lid member 10 in FIGS. 1A and 1B on the side where the peripheral bent portion 10b is not bent (that is, , The inner surface) is approximately matched to the predetermined shape and dimensions. The entrance edge 14d of the opening 14c of the material placement surface 14a of the female mold 14 is chamfered. In this embodiment, the chamfering of the inlet edge 14d is constituted by a convex curved surface.
[0036]
The female mold 14 is fixed to a predetermined position (not shown) of a work place (not shown) where the lid forming apparatus of this embodiment is installed by a fixing screw (not shown) inserted into the fixing screw insertion hole 14e.
[0037]
The sheet material presser 16 is formed with an opening having an edge 16a larger than the entrance edge 14d of the opening 14c of the material mounting surface 14a of the female mold 14. As shown in FIG. 2B, the sheet material presser 16 is placed on a predetermined opening position separated from the material placement surface 14 a of the female mold 14 and on the material placement surface 14 a of the female mold 14. After the sheet material (not shown) for the lid member 10 in FIGS. 1 (A) and 1 (B) is placed, the above opening is used as the entrance to the opening 14c of the material placing surface 14a of the female mold 14. A predetermined pressing position for pressing the sheet material onto the material placement surface 14a by being pressed against the sheet material placed on the material placement surface 14a of the female die 14 in a state corresponding to the edge 14d; Can be moved between.
[0038]
Next, another configuration member of the lid forming apparatus according to the embodiment of the present invention, which is a configuration of the male mold 18 used in combination with the female mold 14 and the sheet material presser 16 is used. Will be described in detail with reference to FIGS. 3A to 3D. FIG. 3A shows another component of the lid forming apparatus according to the embodiment of the present invention. FIG. 3B is a schematic side view of the male mold 18 of FIG. 3A; FIG. [FIG. 3] is a schematic enlarged plan view of a portion surrounded by a two-dot chain line indicated by a reference symbol C in the male mold 18 of FIG. 3A; and FIG. FIG. 3 is a schematic enlarged side view of a portion enlarged and shown in (C) of FIG.
[0039]
The male mold 18 is placed on the outer peripheral surface 18a having a predetermined shape corresponding to the predetermined shape of the flat portion 10a of the lid member 10 and the material mounting surface 14a of the female mold 14 in FIG. A contact surface 18b that contacts the sheet material (not shown) that is pressed onto the material placement surface 14a by the presser 16. Specifically, the predetermined shape and dimensions of the outer peripheral surface 18a are the same as the surface of the flat portion 10a of the cover member 10 in FIG. 1A and FIG. The outer surface) is substantially matched to the predetermined shape and dimensions.
[0040]
The boundary edge 18c between the outer peripheral surface 18a and the contact surface 18b is chamfered. In this embodiment, the chamfering of the boundary edge 18c is constituted by a convex curved surface.
[0041]
At least the stepped portion (corner portion) 18d on the outer peripheral surface 18a is further away from the contact surface 18b from the position P away from the contact surface 18b by a distance shorter than the bending length BL of the peripheral bent portion 10b of the lid member 10. Inclined by a predetermined angle α inward along the contact surface 18b. Note that at least the stepped portion (corner portion) 18d on the outer peripheral surface 18a is constituted by a substantially straight line orthogonal to the contact surface 18b except for the chamfered boundary edge 18c from the contact surface 18b to the position P. Has been.
[0042]
A connecting hole 18 e is formed at the center of the plane of the male mold 18. The connecting hole 18e supports a male mold 18 corresponding to the opening 14c of the material placement surface 14a of the female mold 14 fixed at a predetermined position (not shown) in the work place (not shown). 14 is a known illustration in which the male mold 18 is reciprocated between a spaced position where the male mold 18 is disposed above the opening 14c of the 14 material placement surface 14a and an insertion position where the male mold 18 is inserted into the opening 14c to a predetermined depth. The end of the reciprocating member of the reciprocating device that is not connected is coupled.
[0043]
Next, referring to FIGS. 4A and 4B in the accompanying drawings, the female mold 14, the sheet material retainer 16, and the male mold 18 described with reference to FIGS. 1 is formed from a sheet material by a lid forming apparatus according to an embodiment of the invention of the present application which is configured by combining them with each other. The process will be described.
[0044]
Here, FIG. 4A is a longitudinal sectional view schematically showing a process immediately before forming the lid 10 from the sheet material by the lid molding apparatus according to the embodiment of the present invention. FIG. 4B is a longitudinal sectional view schematically showing a process immediately after the lid material 10 is molded from the sheet material by the lid material molding apparatus according to the embodiment of the invention of the present application.
[0045]
The material 20 of the sheet material formed into the lid 10 shown in FIGS. 1A and 1B by the lid molding apparatus according to the embodiment of the present invention is the lid. It is prepared independently of the molding process in the molding apparatus. The material 20 has a predetermined shape corresponding to the predetermined shape of the opening 14c of the material mounting surface 14a (that is, in this embodiment, a quadrangular shape with four rounded corners). The dimension of the predetermined shape is set to be larger than the dimension of the predetermined shape of the edge 16a of the opening of the sheet material presser 16 as well.
[0046]
In the lid molding apparatus, the male mold 18 is separated from the opening 14c of the material placement surface 14a of the female mold 14 fixed at a predetermined position (not shown) in the work place (not shown) as described above. At the same time, while the sheet material presser 16 is separated from the material placement surface 14a of the female mold 14, the material 20 is placed on the material placement surface 14a.
[0047]
At this time, the raw material 20 corresponds to the predetermined shape of the opening 14c with respect to the opening 14c of the material mounting surface 14a (that is, in this embodiment, the stepped portion of the predetermined shape of the opening 14c). The four corners corresponding to the stepped portions of the predetermined shape of the material 20 are arranged concentrically with the four corners.
[0048]
Next, the sheet material 20 placed on the material placing surface 14a of the female mold 14 as described above is pressed by the sheet material presser 16 as shown in FIG. . At this time, the sheet material presser 16 is made to correspond to the predetermined shape of the opening 14c with respect to the opening 14c of the material placement surface 14a (that is, in this embodiment, the step of the predetermined shape of the opening 14c). The four corners, which are the parts, are arranged concentrically (corresponding to the four corners which are the stepped parts of the predetermined shape of the edge 16a of the opening of the sheet material presser 16).
[0049]
This state is shown in FIG.
[0050]
In FIG. 4A, the male mold 18 is placed in a predetermined position in the spaced position shown in FIG. 4A and in the opening 14c of the material placement surface 14a of the female mold 14 as described above. Reference numeral 22 indicates an end portion of a reciprocating member of a known reciprocating device (not shown) that reciprocates between the insertion position inserted to a depth of 2 mm.
[0051]
Next, the male mold 18 is pressed by bringing the contact surface 18b into contact with the sheet material 20 on the material placement surface 14a of the female mold 14 through the opening of the sheet material retainer 16 by the reciprocating device (not shown). . At this time, the male mold 18 is made to correspond to the predetermined shape of the opening 14c with respect to the opening 14c of the material placement surface 14a (that is, in this embodiment, the step of the predetermined shape of the opening 14c). The four corners which are the parts are arranged concentrically with the four corners which are the stepped parts of the predetermined shape of the contact surface 18b of the male mold 18 corresponding to each other.
[0052]
When the male mold 18 is further pressed by the reciprocating device (not shown), the male mold 18 places the sheet material 20 in the opening 14c of the material placement surface 14a in a state where the contact surface 18b is in contact with the sheet material 20. Is pushed through the inlet edge 14d.
[0053]
As a result, the portion of the sheet material 20 that is in contact with the contact surface 18a of the male mold 18 becomes the flat portion 10a having the predetermined shape of the lid member 10, and the contact of the male mold 18 with the sheet material 20 is achieved. The portion protruding from the surface 18a is drawn into the opening 14c of the female mold 14 at the entrance edge 14d of the opening 14c of the material mounting surface 14a of the female mold 14, that is, around the flat portion 10a, and the inner peripheral surface of the opening 14c. 14b and the outer peripheral surface 18a of the male mold 18 in the opening 14c, along the inner peripheral surface 14b of the opening 14c, from the periphery of the flat portion 10a toward a predetermined direction intersecting the surface of the flat portion 10a. That is, the peripheral bent portion 10b is bent toward the inlet edge 14d of the opening 14c.
[0054]
This state is shown in FIG. 4B, and the lid member 10 shown in FIGS. 1A and 1B is molded.
[0055]
As described above, while the sheet material 20 placed on the material placement surface 14a of the female mold 14 is pushed into the opening 14c of the material placement surface 14a of the female mold 14 by the male mold 18. The sheet material 20 is pressed by the male mold 18 into the opening 14c of the material placement surface 14a of the female mold 14 and the sheet material presser 16 on the material placement surface 14a of the female mold 14. A tensile force is generated between the portion and the portion that is formed.
[0056]
And since the entrance edge 14d of the opening 14c of the material mounting surface 14a of the female mold 14 is chamfered and the boundary edge 18c between the outer peripheral surface 18b of the male mold 18 and the contact surface 18a is chamfered, the above-mentioned The tensile force spreads substantially uniformly over the entire portion of the sheet material 20 that protrudes from the contact surface 18a of the male mold 18, and the predetermined shape of the flat portion 10a of the lid member 10 is stepped, for example, a square shape. Even in the case of a shape having a part, between the surface (outer surface) on the side where the peripheral bent portion 10b is bent in the flat portion 10a and the surface on the side facing the flat portion 10a in the peripheral bent portion 10b. There is no generation of wrinkles along the boundary line. Furthermore, even when the lid 10 has a laminated structure, the wrinkles are not generated, and the surface layer mixed with the wrinkles is broken and cavities are generated between a plurality of layers. There is no be.
[0057]
Further, at least a stepped portion (a corner portion in this embodiment) 18d on the outer peripheral surface 18b of the male mold 18 is separated from the contact surface 18b by a distance shorter than the bent length BL of the peripheral bent portion 10b of the lid member 10. The position P is substantially a straight line perpendicular to the contact surface 18b except for the chamfered boundary edge 18c, and further along the contact surface 18a as the position P is further away from the contact surface 18b. Since it is inclined inward by an angle α, the tensile force is prevented from concentrating at the position corresponding to the stepped portion in the portion of the sheet material 20 that protrudes from the contact surface 18a of the male mold 18. In addition, no wrinkle is generated at a position corresponding to the stepped portion 18d. Furthermore, even when the lid member 10 has a laminated structure, the wrinkle is not generated. Never cause cavities in the surface layer of the tear and a plurality of layers mix the Kishiwa.
[0058]
The lid 10 after being molded from the sheet material 20 as described above is bent when the male mold 18 reaches a predetermined depth in the opening 14c of the material placement surface 14a of the female mold 14. The tip of the portion 10b comes out of the opening 14c of the female die 14, and then the lid member 10 is inserted into the end opening of the cylindrical container 12 as shown in FIG. It is sent to the process for closing the opening.
[0059]
In the above-described embodiment, at least the stepped portion (corner portion in the above-described embodiment) 18 d on the outer peripheral surface 18 a of the male mold 18 is shorter than the bending length BL of the peripheral bending portion 10 b of the lid member 10. The distance P from the contact surface 18b to the position P is a substantially straight line orthogonal to the contact surface 18b except for the chamfered boundary edge 18c, and further away from the position P to the contact surface 18b. As a result, it was inclined inwardly along the contact surface 18a by an angle α. However, over the entire circumference of the outer peripheral surface 18a, contact is made except for the chamfered boundary edge 18c up to a position P that is separated from the contact surface 18b by a distance shorter than the bent length BL of the peripheral bent portion 10b of the lid member 10. In addition to being a substantially straight line orthogonal to the surface 18b, and further further away from the position P with respect to the contact surface 18b, it is inclined inwardly along the contact surface 18a by an angle α. Also, the same effect as the male mold 18 of the above-described embodiment can be obtained.
[0060]
Further, in the above-described embodiment, the predetermined shape of the flat portion 10a of the lid member 10 and the shape of the outer peripheral surface 18a of the male mold 18 corresponding to the predetermined shape are substantially quadrangular and are corner portions. Although 10c is a stepped portion, according to the philosophy of the invention of the present application, it can be any various shapes such as a circle, an ellipse, a polygon other than a quadrangular shape, an indefinite shape, etc. A stepped portion that becomes a portion or a recess is included.
[0061]
【The invention's effect】
As is clear from the above detailed description, according to the lid forming apparatus according to the present invention, the flat portion of a predetermined shape and the periphery of the flat portion intersect the surface of the flat portion from the sheet material. A peripheral bent portion bent in a predetermined direction and inserted into the end opening of the cylindrical container body to close the end opening with the flat portion and the end opening at the peripheral bent portion. A lid material molding apparatus for molding a lid material supported by the inner peripheral surface of the lid member, wherein the predetermined shape of the flat portion of the lid member has a stepped portion such as a square shape. Even in this case, along the boundary line between the surface of the flat portion where the peripheral bent portion is bent and the surface of the peripheral bent portion facing the flat portion, or the peripheral bent portion. In the above No wrinkle is generated at a position corresponding to the stepped portion of the carrier, and even if the lid member has a laminated structure, the surface layer mixed with the wrinkle does not generate the wrinkle and a plurality of tears are generated. There are no cavities between the layers.
[Brief description of the drawings]
FIG. 1A is a plan view of a lid formed from a sheet material by a lid forming apparatus according to an embodiment of the present invention;
FIG. 1B is a side view of a lid formed from a sheet material by a lid forming apparatus according to one embodiment of the present invention; and
FIG. 1C is a partial vertical cross-sectional view showing a state in which the lid member is applied to the end opening of the cylindrical container body to close the end opening.
FIG. 2A is a schematic plan view of a female mold and a sheet material presser that are constituent members of a lid forming apparatus according to an embodiment of the present invention; and
FIG. 2B is a schematic longitudinal cross section taken along line B-B of the female mold and sheet material presser in FIG.
FIG. 3 (A) is a schematic plan view of a male mold that is another one of the constituent members of the lid forming apparatus according to the embodiment of the present invention;
FIG. 3 (B) is a schematic side view of the male mold of FIG. 3 (A);
FIG. 3C is a schematic enlarged plan view of a portion surrounded by a two-dot chain line indicated by reference numeral C in the male mold of FIG. 3A;
FIG. 3D is a schematic enlarged side view of the portion shown enlarged in FIG. 3C as viewed from the direction of arrow D.
FIG. 4A is a longitudinal sectional view schematically showing a process immediately before forming a lid from a sheet material by a lid forming apparatus according to an embodiment of the present invention; And
FIG. 4B is a longitudinal sectional view schematically showing a process immediately after the lid material is molded from the sheet material by the lid material molding apparatus according to the embodiment of the present invention.
[Explanation of symbols]
10 Lid
10a Flat part
10b Peripheral bent part
12 containers
12a End opening
14 Female mold
14a Material placement surface
14b Inner peripheral surface
14c opening
14d entrance edge
16 Sheet material presser
16a rim
18 Male mold
18a outer peripheral surface
18b Contact surface
18c border
18d Stepped part
20 material (sheet material)

Claims

A flat portion having a predetermined shape including a stepped portion that becomes a convex portion or a concave portion from a sheet material, and a peripheral bent portion that is bent from the periphery of the flat portion toward a predetermined direction intersecting the surface of the flat portion. And a lid member that is inserted into the end opening of the cylindrical container body, closes the end opening with the flat portion, and is supported on the inner peripheral surface of the end opening at the peripheral bent portion. An apparatus for forming:
An opening having an inner peripheral surface of a predetermined shape corresponding to the predetermined shape of the flat portion of the lid member is formed and has a material placement surface on which the sheet material is placed, and an entrance of the opening A female mold with chamfered edges;
An opening having an edge larger than an entrance edge of the opening on the material placement surface of the female mold is formed, and the opening is used as an entrance edge of the opening on the material placement surface of the female mold. A sheet material presser that presses the sheet material placed on the material placement surface of the female mold in a corresponding state onto the material placement surface; and
Mounted on the outer peripheral surface of a predetermined shape corresponding to the predetermined shape of the flat portion of the lid member and including a stepped portion that becomes a convex portion or a concave portion, and the material placement surface of the female mold. A contact surface that contacts the sheet material that is placed and pressed onto the material placement surface by the sheet material presser, and the boundary edge between the outer peripheral surface and the contact surface is chamfered The outer peripheral surface is arranged along the contact surface as at least the stepped portion is further away from the contact surface from a position away from the contact surface by a distance shorter than a bending length of the peripheral bent portion of the lid member. Write are inclined, push the contact surface through the inlet edge during the opening of置表surface mounting the material of the female mold of the sheet material being in contact with the sheet material-free, male With molds;
And while the sheet material placed on the material placement surface of the female mold is pushed into the opening of the material placement surface of the female mold by the male mold The sheet material is pressed by the male metal mold onto the material placement surface of the female mold into the opening and the material placement surface of the female mold by the sheet material presser. A lid forming apparatus, wherein a tensile force is generated between the portions.

2. The lid forming apparatus according to claim 1, wherein the predetermined shape is a polygon, and the stepped portion of the outer peripheral surface of the male mold is a corner of the polygon.

The lid forming apparatus according to claim 2, wherein the polygon is a quadrangle.

The outer peripheral surface of the male mold extends over the entire circumference including the stepped portion, and further from the position away from the contact surface by a distance shorter than the bending length of the peripheral bent portion of the lid member, with respect to the contact surface. 4. The lid forming apparatus according to claim 1, wherein the lid forming apparatus is inclined inward along the contact surface as the distance increases. 5.

The lid material forming apparatus according to any one of claims 1 to 4, wherein the sheet material is a material formed into a sheet shape based on paper.

The lid sheet forming apparatus according to claim 1, wherein the sheet material has a laminated structure.

The chamfering of the entrance edge of the opening of the material mounting surface of the female mold and the chamfering of the boundary edge between the outer peripheral surface of the male mold and the contact surface are caused by a convex curved surface. It is comprised, The lid | cover material shaping | molding apparatus of any one of Claim 1 thru | or 6 characterized by the above-mentioned.