JP2004309963A

JP2004309963A - Keyboard cover opening and closing device for keyboard musical instrument

Info

Publication number: JP2004309963A
Application number: JP2003106556A
Authority: JP
Inventors: Kenichiro Hara; 研一郎原
Original assignee: Kawai Musical Instrument Manufacturing Co Ltd
Current assignee: Kawai Musical Instrument Manufacturing Co Ltd
Priority date: 2003-04-10
Filing date: 2003-04-10
Publication date: 2004-11-04

Abstract

<P>PROBLEM TO BE SOLVED: To provide an opening and closing device for a keyboard cover in which the cover is smoothly slid and durability is made superior while sliding the cover along front and back directions in order to open and close the playing section including a keyboard. <P>SOLUTION: In a keyboard cover opening and closing device of an electronic musical instrument, the playing section is opened and closed by sliding a keyboard cover 14, which is arranged between left and right arms of a keyboard musical instrument, along the front and back directions. The cover 14 is provided with bearings 24 which are projected toward both side surfaces of the front section and rotate along the front and back directions. On the left and the right arms, guiding grooves, to which the top and the bottom sections of the bearings are fit in a freely rotative manner, are formed along the front and back directions of the keyboard musical instrument. When the cover is to be slid along the front and back directions, the bearings 24 support the front sections of the cover 14 and rotate in the grooves to guide the cover 14 in the front and back directions. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、鍵盤蓋を前後方向へスライドさせて鍵盤を含む演奏部を開閉する鍵盤楽器の鍵盤蓋開閉装置に関する。
【０００２】
【従来の技術】
従来、電子ピアノなどの電子楽器において、鍵盤の上方に鍵盤蓋を備え、この鍵盤蓋が鍵盤楽器本体から手前側に引き出されて鍵盤を覆う閉鎖位置と、鍵盤蓋が閉鎖位置から鍵盤楽器本体の後方側に押し入れられて鍵盤を露出する開放位置との間で、鍵盤蓋が前後方向にスライド自在に構成された鍵盤蓋開閉装置が知られている。
【０００３】
このような、鍵盤開閉装置においては、鍵盤蓋を鍵盤楽器本体に対してスムーズにスライドさせるために、鍵盤蓋のガイドを備えたものがある。
例えば、鍵盤開閉装置には、鍵盤蓋の前部に両側方に突き出してガイドピンを設けるとともに、鍵盤の両側の腕木に鍵盤楽器の前後方向に沿って鍵盤蓋のガイドピンが嵌合するガイド溝を設け、ガイド溝に沿ってガイドピンをスライドさせて鍵盤蓋を前後方向にスライドするものがある。（例えば、特許文献１参照）
【０００４】
【特許文献１】
特開２００２−２５１１８９号公報（第６頁、第１１−１２図）
【０００５】
【発明が解決しようとする課題】
しかしながら、特許文献１に記載の鍵盤開閉装置によれば、鍵盤蓋を前後にスライドする際に、上下方向のバラツキが生じると、ガイドピンがガイド溝に強く当接し、鍵盤蓋をスムーズに開閉できなくなる虞があった。また、ガイドピンとガイド溝とが強く当接してスライドすると、ガイドピン及びガイド溝の損傷や磨耗が生じ、長期の使用に耐えられなくなる虞があった。
【０００６】
本発明は、こうした問題に鑑みなされたものであり、鍵盤を含む演奏部を開閉するために鍵盤蓋を前後にスライドする際に、鍵盤蓋をスムーズにスライドできて耐久性が良好な鍵盤蓋の開閉装置を提供することを目的とする。
【０００７】
【課題を解決するための手段及び発明の効果】
かかる目的を達成するためになされた請求項１記載の発明は、鍵盤楽器の左右の腕木間に配置された鍵盤蓋を該鍵盤楽器の前後方向にスライドすることにより演奏部を開閉する電子楽器の鍵盤蓋開閉装置であって、前記鍵盤蓋には、該鍵盤蓋の前部に両側方に突き出して設けられて前後に回転する左右のベアリングを備え、前記左右の腕木には、前記左右のベアリングが回転自在に嵌合する左右のガイド溝が前記鍵盤楽器の前後方向に沿って形成され、前記鍵盤蓋を前後方向にスライドする際に、前記ベアリングが、前記ガイド溝内で該鍵盤蓋の前部を支持して回転し、該鍵盤蓋を前後方向に案内することを特徴とする。
【０００８】
請求項１に記載の鍵盤蓋開閉装置によれば、鍵盤蓋には、鍵盤蓋の前部の両側方に突き出して前後に回転するベアリングを備え、左右の腕木には、ベアリングが回転自在に嵌合するガイド溝が鍵盤楽器の前後方向に沿って形成され、鍵盤蓋を前後方向にスライドする際に、ベアリングがガイド溝内で鍵盤蓋の前部を支持して回転し鍵盤蓋を前後方向に案内するので、鍵盤蓋を前後にスライドする際に、ベアリングとガイド溝との当接部に強い摩擦力が生じることなく、鍵盤蓋のスライドをスムーズに行うことができる。また、請求項１に記載の鍵盤蓋開閉装置によれば、鍵盤蓋をスライドする際のベアリング及びガイド溝の損傷や磨耗を低減できて耐久性を向上できる。
【０００９】
次に、請求項２に記載の発明は、請求項１に記載の鍵盤楽器の鍵盤蓋開閉装置において、前記ベアリングは、円筒状の外輪と該外輪の中心に配置されて該外輪に対して回転自在に係合するとともに一端が該外輪の軸方向に突き出した回転軸とを備えた円筒形ベアリングであって、前記円筒形ベアリングは、前記外輪の軸方向が左右の腕木に向かって直交するように前記回転軸の一端が鍵盤蓋の前部に取り付けられるとともに、前記外輪の鍵盤蓋側に位置する端面が該鍵盤蓋の側面と所定の間隔を有するよう取り付けられ、前記ガイド溝は、前記外輪の両端面が嵌合する凹溝が該ガイド溝内の上下方向の何れか一方の内面に沿って形成されていることを特徴とする。
【００１０】
請求項２に記載の鍵盤蓋開閉装置によれば、ガイド溝には、上下方向の何れか一方の内面に、円筒形ベアリングの両端面が嵌合する凹溝がガイド溝に沿って形成されているので、鍵盤蓋をスライドする際に、円筒形ベアリングの円筒部の両端部が凹部に嵌合し、ベアリングがガイド溝から外れることなく鍵盤蓋のスライドをスムーズに行うことができる。
【００１１】
【発明の実施の形態】
次に、本発明が適用された電子楽器の鍵盤蓋開閉装置の一実施形態を図面と共に説明する。図１は本発明の一実施形態の鍵盤開閉装置が適用された鍵盤楽器の外観図、図２は同実施形態の鍵盤楽器の鍵盤蓋を側方から見た側面図（ａ）と前側から見た正面図（ｂ）、図３は同実施形態における鍵盤蓋が閉鎖位置にある鍵盤楽器の側断面図、図４は同実施形態における鍵盤蓋の前蓋を腕木のガイド溝に嵌合した状態を表した断面図、図５は同実施形態における鍵盤蓋の後蓋を腕木の後方案内部に係合する説明図であって（ａ）は後蓋に鍵盤蓋軸ホルダー及び鍵盤蓋軸ホルダー取付金具を取り付けた図、（ｂ）は鍵盤蓋軸ホルダーに案内軸及びピニオンギヤを取り付けた図、（ｃ）は後蓋を後蓋案内部に係合した図、図６は同実施形態における鍵盤蓋が開放位置にある鍵盤楽器の側断面図である。
【００１２】
図１に表したように、この鍵盤楽器１は、鍵盤楽器本体２と両脚部３とで構成されている。鍵盤楽器本体２は、両脚部３が取り付けられた棚板４上に、その前後方向（演奏者から見て手前を「前」、先方を「後」として説明する。）に演奏部８を有し、演奏部８の両側に左右の腕木７を有している。また、鍵盤楽器本体２は、天板５と背面板９とを有しており、これらと棚板４との間の内部空間に音響装置が収容されている。また、演奏部８は、鍵盤１０と操作パネル１２とからなり、操作パネル１２には各種のコントロールスイッチ１１が配設されている。また、操作パネル１２の後方には譜面台１３が設けられている。
【００１３】
また、操作パネル１２の上面と天板５の前板５ａとの間にはスリット１５が形成されており、このスリット１５を介して天板５の下側から鍵盤蓋１４が出し入れされるようになっている。尚、鍵盤蓋１４は、両腕木７に沿って鍵盤楽器１の前後方向にスライドされ演奏部８の上部空間を開閉し、演奏部８を覆い保護するものである。
【００１４】
次に、鍵盤蓋１４を腕木７に沿って鍵盤楽器１の前後方向にスライドする鍵盤蓋開閉装置について説明する。
先ず、鍵盤蓋１４は、図２に表わしたように、演奏部８上方の前方側を覆う前蓋１６と後方側を覆う板状の後蓋１８とを備え、前蓋１６の後端部と後蓋１８の前端部とは、蝶番２０により山形に折りたたみ可能に連結されている。
【００１５】
このうち、前蓋１６は、図２（ａ）に表したように、下方に垂れて鍵盤１０の前方を覆う前垂れ部２２をその前部に備え、前垂れ部２２の両側方に突き出して、前後方向に回転するベアリング２４が備えられている。また、ベアリング２４は、図２（ｂ）に表したように、円筒状の外輪２４ｂと外輪２４ｂの中心に回転自在に係合するとともに一端が外輪２４ｂの軸方向に突き出した回転軸２４ａとを備えた円筒形ベアリングであって、回転軸２４ａの一端を介して、外輪２４ｂの鍵盤蓋側に位置する端面が前蓋１６の側面１６ａと所定の間隔（図中の符号Ｃ）を有するように、前蓋１６の側面１６ａに取り付けられている。尚、円筒形ベアリング２４は、図４に表したように、回転軸２４ａが内輪２４ｄに接合され、内輪２４ｄと外輪２４ｂが円筒形の円筒形転動体２４ｃを介して回転できるように構成されている。
【００１６】
一方、後蓋１８は、図２に表したように、下面に鍵盤蓋軸ホルダー２６が鍵盤蓋軸ホルダー取り付け金具２８を介して取り付けられている。そして、鍵盤蓋軸ホルダー２６に案内軸３０が回転自在に挿通され、案内軸３０の両端に後蓋突起部３２及びピニオンギヤ３４が取り付けられている。
【００１７】
具体的には、図５（ａ）（ｂ）に表したようにこの後蓋突起部３２の一端には取り付け穴３２ａが軸方向に沿って形成されるとともに穴３２ａに連通するビス孔３２ｂが形成されている。そして、取り付け穴３２ａに案内軸３０の端部が挿入され、ビス穴３２ｂからビス３２ｃを入れてネジ止めされ、案内軸３０の両端に円柱状の後蓋突起部３２が取り付けられている。また、後蓋突起部３２の外周部には、ピニオンギヤ３４が一体に形成されている。
【００１８】
次に、左右の腕木７は、図３に表したように、前蓋１６のガイド溝３６と後蓋案内部３８を備えている。
前蓋１６のガイド溝３６は、ベアリング２４が嵌合してスライドできるように、腕木７の内面に沿って配設されて互いにほぼ平行な下側溝壁面３６ａ及び上側溝壁面３６ｂを有し、鍵盤楽器１の左右方向の外側に向けて凹状に形成されている。また、ガイド溝３６は鍵盤楽器１の前後方向に沿って形成されており、背面板９に近づくに従って上方に傾斜するように形成されている。また、下側溝壁面３６ａ及び上側溝壁面３６ｂが前端部３６ｄと後端部３６ｃでそれぞれ連結されており、鍵盤蓋１４を前側に引き出した際に、前蓋１６に取り付けられたベアリング２４がこの連結された前端部３６ｄに当接した位置で停止し、鍵盤蓋１４を後側に押し入れた際に、ベアリング２４がこの連結された後端部３６ｃに当接した位置で停止する。また、図４に表したように、ガイド溝３６の上下の寸法Ｈｇはベアリング２４が嵌合して回転できるように、ベアリング２４の外径（所謂、ベアリングの上下方向の寸法に相当する）Ｈｂよりも大きく形成されている。また、ガイド溝３６の左右方向の奥行き寸法Ｄｇはベアリング２４の両端寸法Ｄｂより大きく形成されている。また、ベアリング２４は下側溝内面３６ａと上側溝内面３６ｂに当接して回転し、ガイド溝３６に沿って前後方向に移動できる。また、下側溝内面３６ａは、前蓋１６が鍵盤楽器１の前後方向にスライドする際には、ベアリング２４を介して前蓋１６を下から支える。一方、上側溝内面３６ｂは、前蓋１６がスライドする際には、ベアリング２４を介して前蓋１６が上方に外れるのを防ぐ。
【００１９】
一方、後蓋案内部３８は、図３、図５（ｃ）に表したように、腕木７の内面に配設されて互いにほぼ平行な下側溝壁面３８ａ及び上側溝壁面３８ｂを有し、鍵盤楽器１の左右方向の外側に向けて凹状に形成され後蓋突起部３２が嵌合してスライドする溝３８ｅが備えられている。また。後蓋案内部３８は、背面板９に近づくにしたがって下方に傾斜している。また、後蓋案内部３８は、下側溝壁面３８ａ及び上側溝壁面３８ｂが前端部３８ｄと後端部３８ｃでそれぞれ連結されており、鍵盤蓋１４を前側に引き出した際に、後蓋突起部３２が前端部３８ｄに当接した位置で停止し、鍵盤蓋２４を後側に押し入れた際に、後蓋突起部３２が後端部３８ｃに当接した位置で停止する。また、後蓋案内部３８より下方に、後蓋１８に取り付けられたピニオンギヤ３４と噛み合うように形成されたラック４０が備えられている。
【００２０】
次に、鍵盤蓋１４をガイド溝３６及び後方案内部３８に取り付ける際の方法を説明する。
まず、図３に表したように、前蓋１６の左右に取り付けられた左右のベアリング２４をそれぞれ腕木７のガイド溝３６に差し入れた状態にする。具体的には、前蓋１６に取り付けられたベアリング２４を、下側溝壁面３６ａと上側溝壁面３６ｂとの間に差し入れた状態にする。この際、前蓋１６の両側面を互いに前後にずらすと、前蓋１６の左右に取り付けられたベアリング２４をそれぞれガイド溝３６に差し入れることができる。
【００２１】
次に、図５（ｃ）に示すように、後蓋１８の後蓋突起部３２をそれぞれ後方案内部３８の溝３８ｅに差し入れた状態にする。この際、予め、案内軸３０の両端を後蓋突起部３２の取り付け孔３２ｂの奥まで差し入れた状態にし、案内軸３０に対して後蓋突起部３２を固定するためのビス３２ｃを緩めておく。
【００２２】
次いで、後蓋突起部３２を下側溝壁面３８ａと上側溝壁面３８ｂとの間に差し入れるとともに、後蓋１８に取り付けられたピニオンギヤ３４と後蓋案内部３８の下方に備えられたラック４０とが噛み合うよう設置する。次いで、後蓋突起部３２が案内軸３０に対して動かなくなるまでビス３２ｃを締め付けると後蓋１８が鍵盤楽器１に取り付けられる。
【００２３】
尚、前述のように、鍵盤楽器１に取り付けられた状態の鍵盤蓋１４は、鍵盤楽器１の前側に引き出すと、前蓋１６に取り付けられたベアリング２４がそれぞれガイド溝３６の下側溝壁面３６ａと上側溝壁面３６ｂに当接して回転しながら鍵盤蓋１４を支持して移動させ、ベアアリング２４がガイド溝３６の前端部３６ｄに当接することにより、鍵盤蓋１４が停止する。この場合、鍵盤蓋１４は、鍵盤楽器１の前側に近づくに従って下方に傾斜し、鍵盤１０及び操作パネル１２の上方を覆うように配置される（所謂、閉鎖位置である）。
【００２４】
一方、前述のように鍵盤楽器１に取り付けられた鍵盤蓋１４を鍵盤楽器１から取り外すには、前述の手順を逆に進めるとよい。すなわち、後蓋突起部３２を案内軸３０に固定しているビス３２ｃを緩め、後蓋突起部３２を案内軸３０の内側に向けて動かし、後蓋１８を上方に移動させて後方案内部３８の溝３８ｅから外し、次いで、鍵盤蓋１４の両側面を互いに前後にずらしてベアリング２４をガイド溝３６から外すと、鍵盤蓋１４が鍵盤楽器１から外れる。
【００２５】
次に、鍵盤蓋１４の開閉動作について説明する。
鍵盤１０及び操作パネル１２の上方を覆う鍵盤蓋１４を図１に示す閉鎖位置か開放するには、まず、前蓋１６を押すなどして鍵盤蓋１４を鍵盤楽器１の後方に向けて移動させる。すると、図６に示すように、鍵盤蓋１４は後方にスライドしながら蝶番２０から山形に折り曲げ始め、後蓋１８の後蓋突起部３２が後方案内部３８の後端部３８ｃに到着して当接する。その位置からさらに鍵盤蓋１４を後方に移動させると、後蓋１８が、後蓋突起部３２及び案内軸３０を中心に回転し始めるとともに、前蓋１６に取り付けられたベアリング２４がガイド溝３６の後端部３６ｃに到着して当接する。すると、鍵盤蓋１４のスライドが停止し、鍵盤蓋１４が鍵盤楽器１の内部に下り畳まれた状態で収納される（所謂、この鍵盤蓋の位置が開放位置である）。
【００２６】
一方、鍵盤蓋を閉じるには、鍵盤楽器１の内部に折りたたまれた鍵盤蓋１４を前側に引くなどして演奏部８の上方に向けて移動させる。すると、前蓋１６の前部に取り付けられたベアリング２４がガイド溝３６の後端部３６ｃから離れ、ガイド溝３６の上面及び下面に当接しながら回転し、前蓋１６を支持しながら前方へスライドする。さらに、鍵盤蓋１４を前側に引いてスライドさせると、後蓋１８の後蓋突起部３２が後方案内部３８の後端部３８ｃから離れて前方にスライドし、前蓋１６に取り付けられたベアリング２４がガイド溝３６の前端部３６ｄに到着して鍵盤蓋１４が停止し、演奏部８の上方を覆う（所謂、この鍵盤蓋の位置が閉鎖位置である）。
【００２７】
以下に、前記の構成を有する実施形態の、鍵盤楽器の鍵盤蓋開閉機構の作用効果を記載する。
本実施の形態における鍵盤楽器の鍵盤蓋開閉装置によれば、鍵盤蓋１４には、鍵盤蓋１４の前部の両側方に突き出して前後に回転するベアリング２４を備え、左右の腕木７には、ベアリング２４が回転自在に嵌合するガイド溝３６が鍵盤楽器１の前後方向に沿って形成され、鍵盤蓋１４を前後方向にスライドする際に、ベアリング２４がガイド溝３６内で鍵盤蓋１４の前部を支持して回転し鍵盤蓋１４を前後方向に案内するので、鍵盤蓋１４を前後にスライドする際に、ベアリング２４とガイド溝３６との当接部に強い摩擦力が生じることなく、鍵盤蓋１４のスライドをスムーズに行うことができる。また、本実施の形態における鍵盤楽器の鍵盤蓋開閉装置によれば、請求項１に記載の鍵盤蓋開閉装置によれば、鍵盤蓋１４をスライドする際のベアリング２４及びガイド溝３６の損傷や磨耗を低減できて耐久性を向上できる。
（変形例）
次に、図７を用いて、本発明の鍵盤蓋開閉装置の変形例について説明する。図７は変形例における鍵盤蓋の前部を腕木に嵌合した状態を表した断面図である。尚、図７に表した変形例は図４に表した実施の形態と基本的な構成は同じなので、詳細な説明は省き、特徴となる部分について以下に説明する。
【００２８】
図７において、円筒形ベアリング２４は、円筒状の外輪２４ｂと外輪２４ｂの中心に配置されて外輪２４ｂに対して回転自在に係合するとともに一端が外輪２４ｂの軸方向に突き出した回転軸２４ａとを備えている。また、円筒形ベアリング２４は、外輪２４ｂの軸方向が左右の腕木７に向かって直交するように前記回転軸２４ａの一端が鍵盤蓋の前部に取り付けられるとともに、外輪２４ｂの鍵盤蓋側に位置する端面２４ｇが鍵盤蓋の側面１６ａと所定の間隔（図中の符号Ｃ）を有するよう取り付けられている。
【００２９】
一方、ガイド溝３６は、下側溝壁面３６ａと上側溝壁面３６ｂの前蓋１６側に突起３６ｆが形成され、ガイド溝３６内の内面である下側溝壁面３６ａと上側溝壁面３６ｂに沿って円筒形ベアリング２４の外輪２４ｂの両端面が嵌合する凹溝が形成されている。
【００３０】
以下に、前記の構成を有する変形例の、鍵盤楽器の鍵盤蓋開閉装置の作用効果を記載する。
本発明の変形例による鍵盤楽器の鍵盤蓋開閉装置によれば、ガイド溝３６の内面である下側溝壁面３６ａと上側溝壁面３６ｂの前蓋１６側に突起３６ｆが形成され、下側溝壁面３６ａと上側溝壁面３６ｂに沿って、円筒形ベアリング２４の外輪２４ｂの両端面が嵌合する凹溝が形成されているので、鍵盤蓋１４をスライドする際に、円筒形ベアリング外輪部２４ｂの両端部が凹溝に嵌合し、ベアリング２４がガイド溝３６から外れることなく鍵盤蓋１４のスライドをスムーズに行うことができる。
【００３１】
尚、本発明の実施の形態によれば、ガイド溝３６は、腕木７の内面から外側に凹となるように形成したが、腕木７の内面から上下に対向する一対のリブを内側に突き出して形成しても良い。
また、本発明の実施の形態によれば、ガイド溝３６は、下側溝壁面３６ａと上側溝壁面３６ｂが前後方向に平行となるように形成したが、後端部３６ｃ、前端部３６ｄに近づくにつれて、下側溝壁面３６ａと上側溝壁面３６ｂの間隔を狭く形成してもよい。これにより、ベアリング２４が前蓋１６を支持して後端部３６ｃ、前端部３６ｄに当接した際に、鍵盤蓋１４の上下方向のガタツキを低減できる。
【００３２】
また、本発明の実施の形態によれば、円筒形ベアリング２４の回転軸２４ａを前蓋１６に固定して外輪２４ｂを回転させるものとしたが、外輪２４ｂを前蓋に固定して回転軸２４ａを前蓋１６の側方に突き出し、回転軸４ａの突き出し部をガイド溝内に嵌合して回転させてもよい。
【図面の簡単な説明】
【図１】本発明の一実施形態の鍵盤開閉装置が適用された鍵盤楽器の外観図である。
【図２】同実施形態の鍵盤楽器の鍵盤蓋を側方から見た側面図（ａ）と前側から見た正面図（ｂ）である。
【図３】同実施形態における鍵盤蓋が閉鎖位置にある鍵盤楽器の側断面図である。
【図４】同実施形態における鍵盤蓋の前蓋を腕木のガイド溝に嵌合した状態を表した断面図である。
【図５】同実施形態における鍵盤蓋の後蓋を腕木の後方案内部に係合する説明図であり、（ａ）は後蓋に鍵盤蓋軸ホルダー及び鍵盤蓋軸ホルダー取付金具を取り付けた図、（ｂ）は鍵盤蓋軸ホルダーに案内軸及びピニオンギヤを取り付けた図、（ｃ）は後蓋を後蓋案内部に係合した図である。
【図６】同実施形態における鍵盤蓋が開放位置にある鍵盤楽器の側断面図である。
【図７】同実施形態の変形例における鍵盤蓋の前部を腕木に嵌合した状態を表した断面図である。
【符号の説明】１…鍵盤楽器、２…ピアノ本体、３…両脚部、４…棚板、５…天板、６…奥屋根、７…腕木、８…演奏部、９…背面板、１０…鍵盤、１１…コントロールスイッチ、１２…操作パネル、１３…譜面台、１４…鍵盤蓋、１５…スリット、１６…前蓋、１６ａ…側面、１８…後蓋、２０…蝶番、２２…前垂れ部、２３…後蓋突起部ガイド溝、２４…ベアリング（円筒形ベアリング）、２４ａ…回転軸、２４ｂ…外輪、２４ｃ…円筒形転動体、２５…凹溝、２６…鍵盤蓋軸ホルダー、２６ａ…軸用孔、２８…鍵盤蓋軸ホルダー取付金具、３０…案内軸、３２…後蓋突起部、３２ａ…取付穴、３２ｂ…ビス孔、３２ｃ…ビス、３４…ピニオンギヤ、３６…前蓋案内部（ガイド溝）、３６ａ，３８ａ，…下側溝壁面、３６ｂ，３８ｂ…上側溝壁面、３６ｃ，３８ｃ…後端部、３６ｄ，３８ｄ…前端部、３６ｅ…突起部、３８…後蓋案内部、４０…ラック。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a keyboard cover opening / closing device for a keyboard instrument that opens and closes a playing section including a keyboard by sliding a keyboard cover in the front-back direction.
[0002]
[Prior art]
Conventionally, in electronic musical instruments such as electronic pianos, a keyboard cover is provided above the keyboard, and the keyboard cover is pulled out from the keyboard instrument body to the front side to cover the keyboard, and the keyboard cover is moved from the closed position to the keyboard instrument body. 2. Description of the Related Art A keyboard cover opening / closing device in which a keyboard cover is slidable in a front-rear direction between an open position in which the keyboard is pushed backward and a keyboard is exposed is known.
[0003]
Some of such keyboard opening / closing devices are provided with a keyboard cover guide to smoothly slide the keyboard cover with respect to the keyboard instrument body.
For example, in a keyboard opening / closing device, guide pins are provided on both sides of a keyboard cover so as to protrude to both sides thereof, and guide grooves of the keyboard cover are fitted into arms on both sides of the keyboard along the front-back direction of the keyboard instrument. In some cases, a guide pin is slid along a guide groove to slide a keyboard cover back and forth. (For example, see Patent Document 1)
[0004]
[Patent Document 1]
JP-A-2002-251189 (page 6, FIG. 11-12)
[0005]
[Problems to be solved by the invention]
However, according to the keyboard opening / closing device described in Patent Document 1, when the keyboard lid slides back and forth, if there is a variation in the vertical direction, the guide pins strongly contact the guide grooves, and the keyboard lid can be opened and closed smoothly. There was a risk of disappearing. Further, if the guide pin and the guide groove come into strong contact with each other and slide, the guide pin and the guide groove may be damaged or worn, and may not be able to withstand long-term use.
[0006]
The present invention has been made in view of such a problem, and when sliding a keyboard cover back and forth to open and close a playing section including a keyboard, the keyboard cover can be slid smoothly, and the durability of the keyboard cover is excellent. It is an object to provide a switchgear.
[0007]
Means for Solving the Problems and Effects of the Invention
In order to achieve this object, the invention according to claim 1 is directed to an electronic musical instrument that opens and closes a playing section by sliding a keyboard cover disposed between left and right arms of the keyboard instrument in the front-rear direction of the keyboard instrument. A keyboard cover opening / closing device, wherein the keyboard cover includes left and right bearings that are provided on both sides of a front portion of the keyboard cover so as to protrude and rotate back and forth, and the left and right arms are provided with the left and right bearings. Left and right guide grooves are formed along the front and rear direction of the keyboard instrument so that the bearings can be rotatably fitted. When the keyboard cover is slid in the front and rear direction, the bearing is positioned in front of the keyboard cover in the guide grooves. The keyboard cover is rotated while being supported, and the keyboard cover is guided in the front-rear direction.
[0008]
According to the keyboard cover opening and closing device of the first aspect, the keyboard cover is provided with bearings protruding to both sides of the front portion of the keyboard cover and rotating back and forth, and the bearings are rotatably fitted to the left and right arms. A matching guide groove is formed along the front and rear direction of the keyboard instrument, and when sliding the keyboard cover in the front and rear direction, the bearing rotates in the guide groove by supporting the front part of the keyboard cover and moves the keyboard cover in the front and rear direction. Since the guide is guided, when the keyboard is slid back and forth, a strong frictional force is not generated at the contact portion between the bearing and the guide groove, and the keyboard can be slid smoothly. Further, according to the keyboard cover opening / closing device of the first aspect, it is possible to reduce the damage and wear of the bearings and the guide grooves when the keyboard cover is slid, thereby improving the durability.
[0009]
Next, according to a second aspect of the present invention, in the keyboard cover opening and closing device for a keyboard instrument according to the first aspect, the bearing is disposed at a center of the cylindrical outer ring and the outer ring and rotates with respect to the outer ring. A cylindrical bearing having a rotating shaft that freely engages and has one end protruding in the axial direction of the outer ring, wherein the cylindrical bearing has an axial direction of the outer ring orthogonal to right and left arms. One end of the rotating shaft is attached to a front portion of the keyboard cover, and an end surface of the outer ring located on the keyboard cover side is attached to have a predetermined distance from a side surface of the keyboard cover, and the guide groove is provided on the outer ring. Are formed along any one of the inner surfaces of the guide groove in the up-down direction.
[0010]
According to the keyboard cover opening and closing device of the second aspect, the guide groove is formed with a concave groove along which the both end surfaces of the cylindrical bearing are fitted on one of the inner surfaces in the vertical direction. Therefore, when sliding the keyboard cover, both ends of the cylindrical portion of the cylindrical bearing are fitted into the concave portions, and the keyboard cover can be smoothly slid without the bearing coming off the guide groove.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of a keyboard cover opening and closing device for an electronic musical instrument to which the present invention is applied will be described with reference to the drawings. FIG. 1 is an external view of a keyboard instrument to which a keyboard opening / closing device according to an embodiment of the present invention is applied, and FIG. 2 is a side view (a) of a keyboard lid of the keyboard instrument of the embodiment viewed from the side and a front view. FIG. 3 is a side cross-sectional view of the keyboard instrument with the keyboard lid in the closed position in the embodiment, and FIG. 4 is a state in which the front lid of the keyboard lid in the embodiment is fitted in the guide groove of the arm. FIG. 5 is an explanatory view in which the rear cover of the keyboard cover in the embodiment is engaged with the rear guide portion of the arm tree, and FIG. 5A is a view illustrating the attachment of the keyboard cover shaft holder and the keyboard cover shaft holder to the rear cover. FIG. 6 (b) is a diagram in which a guide shaft and a pinion gear are mounted on a keyboard cover shaft holder, FIG. 6 (c) is a diagram in which a rear cover is engaged with a rear cover guide, and FIG. 6 is a keyboard cover in the embodiment. FIG. 2 is a side sectional view of the keyboard instrument in an open position.
[0012]
As shown in FIG. 1, the keyboard instrument 1 includes a keyboard instrument body 2 and both legs 3. The keyboard instrument body 2 has a playing section 8 on a shelf 4 to which both legs 3 are attached, in the front-rear direction (the front is viewed as "front" and the front is "rear" when viewed from the player). The left and right arms 7 are provided on both sides of the playing section 8. The keyboard instrument body 2 has a top plate 5 and a back plate 9, and an acoustic device is accommodated in an internal space between the top plate 5 and the shelf plate 4. The playing section 8 includes a keyboard 10 and an operation panel 12, and the operation panel 12 is provided with various control switches 11. A music stand 13 is provided behind the operation panel 12.
[0013]
Further, a slit 15 is formed between the upper surface of the operation panel 12 and the front plate 5a of the top panel 5 so that the keyboard cover 14 can be inserted and removed from below the top panel 5 through the slit 15. Has become. The keyboard cover 14 is slid along the both arms 7 in the front-rear direction of the keyboard instrument 1 to open and close the upper space of the playing section 8 to cover and protect the playing section 8.
[0014]
Next, a keyboard cover opening / closing device that slides the keyboard cover 14 in the front-rear direction of the keyboard instrument 1 along the arm 7 will be described.
First, as shown in FIG. 2, the keyboard cover 14 includes a front cover 16 covering the front side above the playing section 8 and a plate-shaped rear cover 18 covering the rear side. The front end of the rear lid 18 is hingedly connected to the front end of the rear lid 18 so as to be foldable in a mountain shape.
[0015]
2A, the front lid 16 has a front hanging portion 22 that hangs downward and covers the front of the keyboard 10 at its front portion, and protrudes to both sides of the front hanging portion 22 to extend forward and backward. A bearing 24 is provided which rotates in a direction. Further, as shown in FIG. 2B, the bearing 24 includes a cylindrical outer ring 24b and a rotation shaft 24a that rotatably engages with the center of the outer ring 24b and has one end protruding in the axial direction of the outer ring 24b. A cylindrical bearing provided such that an end face of the outer ring 24b located on the keyboard cover side has a predetermined interval (reference numeral C in the drawing) with the side face 16a of the front cover 16 via one end of the rotating shaft 24a. , Is attached to the side surface 16 a of the front lid 16. As shown in FIG. 4, the cylindrical bearing 24 is configured such that the rotating shaft 24a is joined to the inner ring 24d, and the inner ring 24d and the outer ring 24b can rotate through a cylindrical rolling element 24c. I have.
[0016]
On the other hand, as shown in FIG. 2, the rear lid 18 has a keyboard cover shaft holder 26 attached to the lower surface thereof via a keyboard cover shaft holder mounting bracket 28. The guide shaft 30 is rotatably inserted into the keyboard cover shaft holder 26, and the rear cover protrusion 32 and the pinion gear 34 are attached to both ends of the guide shaft 30.
[0017]
Specifically, as shown in FIGS. 5A and 5B, a mounting hole 32 a is formed at one end of the rear lid projection 32 along the axial direction, and a screw hole 32 b communicating with the hole 32 a is formed. Is formed. Then, the end of the guide shaft 30 is inserted into the mounting hole 32a, a screw 32c is inserted from the screw hole 32b and screwed, and a cylindrical rear lid projection 32 is attached to both ends of the guide shaft 30. Further, a pinion gear 34 is integrally formed on the outer peripheral portion of the rear cover projection 32.
[0018]
Next, as shown in FIG. 3, the left and right arms 7 have a guide groove 36 of the front cover 16 and a rear cover guide 38.
The guide groove 36 of the front cover 16 has a lower groove wall surface 36a and an upper groove wall surface 36b which are arranged along the inner surface of the arm arm 7 and are substantially parallel to each other so that the bearing 24 can be fitted and slid. The musical instrument 1 is formed in a concave shape toward the outside in the left-right direction. The guide groove 36 is formed along the front-back direction of the keyboard instrument 1, and is formed so as to be inclined upward as it approaches the back plate 9. Further, the lower groove wall surface 36a and the upper groove wall surface 36b are connected at a front end portion 36d and a rear end portion 36c, respectively. When the keyboard cover 14 is pulled out to the front side, the bearing 24 attached to the front cover 16 is connected to the lower cover. When the keyboard cover 14 is pushed rearward, the bearing 24 stops at a position where it comes into contact with the connected rear end portion 36c. Also, as shown in FIG. 4, the upper and lower dimensions Hg of the guide groove 36 are set to the outer diameter (corresponding to the so-called vertical dimension of the bearing) Hb of the bearing 24 so that the bearing 24 can be fitted and rotated. It is formed larger than. The depth Dg in the left-right direction of the guide groove 36 is formed to be larger than both ends Db of the bearing 24. Further, the bearing 24 rotates while contacting the inner surface 36 a of the lower groove and the inner surface 36 b of the upper groove, and can move in the front-rear direction along the guide groove 36. When the front cover 16 slides in the front-back direction of the keyboard instrument 1, the lower groove inner surface 36a supports the front cover 16 from below via the bearing 24. On the other hand, the upper groove inner surface 36b prevents the front cover 16 from coming off upward through the bearing 24 when the front cover 16 slides.
[0019]
On the other hand, as shown in FIGS. 3 and 5 (c), the rear cover guide portion 38 has a lower groove wall surface 38a and an upper groove wall surface 38b which are disposed on the inner surface of the arm member 7 and are substantially parallel to each other. There is provided a groove 38e which is formed in a concave shape toward the outside in the left-right direction of the musical instrument 1 and in which the rear cover projection 32 fits and slides. Also. The rear cover guide portion 38 is inclined downward as approaching the back plate 9. Also, the rear cover guide portion 38 has a lower groove wall surface 38a and an upper groove wall surface 38b connected to each other at a front end portion 38d and a rear end portion 38c, and when the keyboard cover 14 is pulled out to the front side, the rear cover protrusion 32 Stops at the position where it comes into contact with the front end 38d, and stops when the keyboard lid 24 is pushed in rearward, at the position where the rear cover projection 32 comes into contact with the rear end 38c. A rack 40 is provided below the rear cover guide 38 so as to mesh with the pinion gear 34 attached to the rear cover 18.
[0020]
Next, a method for attaching the keyboard cover 14 to the guide groove 36 and the rear guide portion 38 will be described.
First, as shown in FIG. 3, the left and right bearings 24 attached to the left and right of the front lid 16 are inserted into the guide grooves 36 of the arms 7 respectively. Specifically, the bearing 24 attached to the front lid 16 is inserted between the lower groove wall surface 36a and the upper groove wall surface 36b. At this time, if the both sides of the front cover 16 are shifted back and forth, the bearings 24 attached to the left and right of the front cover 16 can be inserted into the guide grooves 36, respectively.
[0021]
Next, as shown in FIG. 5C, the rear lid projections 32 of the rear lid 18 are inserted into the grooves 38e of the rear guide part 38, respectively. At this time, both ends of the guide shaft 30 are inserted in advance into the mounting holes 32b of the rear lid projection 32, and screws 32c for fixing the rear lid projection 32 to the guide shaft 30 are loosened. .
[0022]
Next, the rear cover protrusion 32 is inserted between the lower groove wall surface 38a and the upper groove wall surface 38b, and the pinion gear 34 attached to the rear cover 18 and the rack 40 provided below the rear cover guide portion 38 are provided. Set up to engage. Next, when the screw 32c is tightened until the rear cover projection 32 does not move with respect to the guide shaft 30, the rear cover 18 is attached to the keyboard instrument 1.
[0023]
As described above, when the keyboard cover 14 attached to the keyboard instrument 1 is pulled out to the front side of the keyboard instrument 1, the bearings 24 attached to the front cover 16 are respectively connected to the lower groove wall surfaces 36 a of the guide grooves 36. The keyboard cover 14 is supported and moved while rotating in contact with the upper groove wall surface 36b, and the keyboard cover 14 stops when the bearer ring 24 contacts the front end 36d of the guide groove 36. In this case, the keyboard cover 14 is inclined downward as it approaches the front side of the keyboard instrument 1 and is disposed so as to cover the keyboard 10 and the operation panel 12 (a so-called closed position).
[0024]
On the other hand, to remove the keyboard cover 14 attached to the keyboard instrument 1 from the keyboard instrument 1 as described above, the above procedure may be reversed. That is, the screw 32c fixing the rear cover projection 32 to the guide shaft 30 is loosened, the rear cover projection 32 is moved toward the inside of the guide shaft 30, and the rear cover 18 is moved upward, so that the rear guide portion 38 Then, when the bearing 24 is removed from the guide groove 36 by displacing the both sides of the keyboard cover 14 back and forth, the keyboard cover 14 is removed from the keyboard instrument 1.
[0025]
Next, the opening / closing operation of the keyboard cover 14 will be described.
To open the keyboard cover 14 covering the upper part of the keyboard 10 and the operation panel 12 from the closed position shown in FIG. 1, first, the front cover 16 is pressed to move the keyboard cover 14 toward the rear of the keyboard instrument 1. . Then, as shown in FIG. 6, the keyboard cover 14 starts to bend from the hinge 20 into a chevron while sliding backward, and the rear cover projection 32 of the rear cover 18 reaches the rear end 38 c of the rear guide portion 38 and contacts the rear cover 38. Touch When the keyboard cover 14 is further moved backward from that position, the rear cover 18 starts to rotate about the rear cover projection 32 and the guide shaft 30, and the bearing 24 attached to the front cover 16 It arrives at the rear end 36c and comes into contact with it. Then, the sliding of the keyboard cover 14 is stopped, and the keyboard cover 14 is stored in a state of being folded down inside the keyboard instrument 1 (a so-called position of the keyboard cover is an open position).
[0026]
On the other hand, in order to close the keyboard cover, the keyboard cover 14 folded inside the keyboard instrument 1 is moved toward the upper side of the playing section 8 by, for example, pulling forward. Then, the bearing 24 attached to the front part of the front lid 16 separates from the rear end part 36c of the guide groove 36, rotates while contacting the upper and lower surfaces of the guide groove 36, and slides forward while supporting the front lid 16. I do. Further, when the keyboard cover 14 is pulled forward and slid, the rear cover projection 32 of the rear cover 18 slides forward away from the rear end 38c of the rear guide portion 38, and the bearing 24 attached to the front cover 16 is moved. Arrives at the front end 36d of the guide groove 36, the keyboard cover 14 stops, and covers the upper part of the playing section 8 (the position of the keyboard cover is the closed position).
[0027]
The operation and effect of the keyboard cover opening and closing mechanism of the keyboard instrument of the embodiment having the above configuration will be described below.
According to the keyboard cover opening and closing device of the keyboard instrument in the present embodiment, the keyboard cover 14 is provided with bearings 24 protruding to both sides of the front part of the keyboard cover 14 and rotating back and forth, and the left and right arms 7 are provided with: A guide groove 36 in which the bearing 24 is rotatably fitted is formed along the front-back direction of the keyboard instrument 1, and when the keyboard cover 14 is slid in the front-back direction, the bearing 24 is positioned in front of the keyboard cover 14 in the guide groove 36. Since the keyboard cover 14 rotates and guides the keyboard cover 14 in the front-rear direction, when the keyboard cover 14 is slid back and forth, a strong frictional force is not generated in the contact portion between the bearing 24 and the guide groove 36, and the keyboard The sliding of the lid 14 can be performed smoothly. Further, according to the keyboard cover opening and closing device of the keyboard instrument in the present embodiment, according to the keyboard cover opening and closing device of claim 1, the bearing 24 and the guide groove 36 are damaged or worn when the keyboard cover 14 is slid. And durability can be improved.
(Modification)
Next, a modification of the keyboard cover opening and closing device of the present invention will be described with reference to FIG. FIG. 7 is a cross-sectional view illustrating a state in which the front part of the keyboard cover according to the modification is fitted to a brace. Since the modification shown in FIG. 7 has the same basic configuration as the embodiment shown in FIG. 4, detailed description will be omitted, and characteristic portions will be described below.
[0028]
In FIG. 7, a cylindrical bearing 24 has a cylindrical outer ring 24b and a rotating shaft 24a which is disposed at the center of the outer ring 24b, rotatably engages with the outer ring 24b, and has one end protruding in the axial direction of the outer ring 24b. It has. One end of the rotating shaft 24a is attached to the front part of the keyboard cover so that the axial direction of the outer ring 24b is orthogonal to the left and right arms 7 and the cylindrical bearing 24 is positioned on the keyboard cover side of the outer ring 24b. The end face 24g is attached so as to have a predetermined interval (reference numeral C in the figure) with the side face 16a of the keyboard lid.
[0029]
On the other hand, the guide groove 36 has a protrusion 36f formed on the front lid 16 side of the lower groove wall surface 36a and the upper groove wall surface 36b, and has a cylindrical shape along the lower groove wall surface 36a and the upper groove wall surface 36b which are the inner surfaces in the guide groove 36. A concave groove into which both end surfaces of the outer ring 24b of the bearing 24 fit is formed.
[0030]
The operation and effect of the keyboard cover opening and closing device of the keyboard instrument of the modified example having the above-described configuration will be described below.
According to the keyboard cover opening and closing device of the keyboard instrument according to the modified example of the present invention, the lower groove wall surface 36a, which is the inner surface of the guide groove 36, and the protrusion 36f are formed on the front cover 16 side of the upper groove wall surface 36b. A concave groove is formed along the upper groove wall surface 36b so that both end surfaces of the outer ring 24b of the cylindrical bearing 24 are fitted. Therefore, when the keyboard cover 14 is slid, both ends of the cylindrical bearing outer ring portion 24b are The keyboard cover 14 can be smoothly slid without being fitted into the concave groove and without the bearing 24 coming off the guide groove 36.
[0031]
According to the embodiment of the present invention, the guide groove 36 is formed so as to be depressed outward from the inner surface of the arm 7, but a pair of vertically opposed ribs projecting inward from the inner surface of the arm 7. It may be formed.
Further, according to the embodiment of the present invention, the guide groove 36 is formed such that the lower groove wall surface 36a and the upper groove wall surface 36b are parallel to the front-rear direction, but as the rear groove 36c approaches the front groove 36d. Alternatively, the gap between the lower groove wall surface 36a and the upper groove wall surface 36b may be formed to be narrow. Thereby, when the bearing 24 supports the front lid 16 and abuts on the rear end portion 36c and the front end portion 36d, rattling of the keyboard lid 14 in the vertical direction can be reduced.
[0032]
According to the embodiment of the present invention, the rotating shaft 24a of the cylindrical bearing 24 is fixed to the front cover 16 to rotate the outer ring 24b. However, the outer ring 24b is fixed to the front cover and the rotating shaft 24a is fixed. May be projected to the side of the front lid 16, and the projected portion of the rotating shaft 4a may be fitted into the guide groove and rotated.
[Brief description of the drawings]
FIG. 1 is an external view of a keyboard instrument to which a keyboard opening / closing device according to an embodiment of the present invention is applied.
FIG. 2 is a side view (a) of the keyboard cover of the keyboard instrument of the embodiment viewed from the side and a front view (b) viewed from the front side.
FIG. 3 is a side sectional view of the keyboard instrument with the keyboard cover in the closed position in the embodiment.
FIG. 4 is a cross-sectional view illustrating a state in which a front cover of the keyboard cover according to the embodiment is fitted into a guide groove of a brace.
FIG. 5 is an explanatory view showing a state in which a rear cover of the keyboard cover in the embodiment is engaged with a rear guide portion of the arm tree, and FIG. 5A is a diagram in which a keyboard cover shaft holder and a keyboard cover shaft holder mounting bracket are attached to the rear cover; (B) is a diagram in which a guide shaft and a pinion gear are attached to a keyboard cover shaft holder, and (c) is a diagram in which a rear cover is engaged with a rear cover guide.
FIG. 6 is a side sectional view of the keyboard instrument with the keyboard cover in the open position in the embodiment.
FIG. 7 is a cross-sectional view showing a state in which a front portion of a keyboard cover is fitted to a brace in a modification of the embodiment.
[Explanation of Signs] 1 ... keyboard instrument, 2 ... piano body, 3 ... both legs, 4 ... shelf board, 5 ... top board, 6 ... back roof, 7 ... arm tree, 8 ... performance section, 9 ... back board, 10 ... keyboard, 11 ... control switch, 12 ... operation panel, 13 ... music stand, 14 ... key cover, 15 ... slit, 16 ... front cover, 16a ... side surface, 18 ... rear cover, 20 ... hinge, 22 ... front hanging part, Reference numeral 23: rear cover protrusion guide groove, 24: bearing (cylindrical bearing), 24a: rotating shaft, 24b: outer ring, 24c: cylindrical rolling element, 25: concave groove, 26: keyboard cover shaft holder, 26a: for shaft Hole, 28: Keyboard lid shaft holder mounting bracket, 30: Guide shaft, 32: Rear lid projection, 32a: Mounting hole, 32b: Screw hole, 32c: Screw, 34: Pinion gear, 36: Front lid guide (guide groove) ), 36a, 38a,..., Lower groove wall surface, 36b, 38b,. The groove wall surface, 36c, 38c ... rear end, 36d, 38d ... front end, 36e ... protruding portion, 38 ... rear lid guide portion, 40 ... rack.

Claims

A keyboard lid opening and closing device for an electronic musical instrument that opens and closes a playing section by sliding a keyboard lid disposed between left and right arms of the keyboard instrument in the front-back direction of the keyboard instrument,
The keyboard cover includes left and right bearings that protrude to both sides at the front of the keyboard cover and rotate back and forth,
In the left and right arms, left and right guide grooves into which the left and right bearings are rotatably fitted are formed along the front and rear direction of the keyboard instrument,
When sliding the keyboard cover in the front-rear direction, the bearing rotates while supporting the front portion of the keyboard cover in the guide groove, and guides the keyboard cover in the front-rear direction.
A keyboard cover opening / closing device for a keyboard instrument.

The bearing is a cylindrical bearing having a cylindrical outer ring and a rotation shaft disposed at the center of the outer ring, rotatably engaged with the outer ring, and having one end protruding in the axial direction of the outer ring. hand,
The cylindrical bearing has one end of the rotating shaft attached to a front portion of the keyboard cover such that an axial direction of the outer ring is orthogonal to left and right arms, and an end surface located on the keyboard cover side of the outer ring. Is attached so as to have a predetermined spacing from the side of the keyboard lid,
In the guide groove, a concave groove in which both end surfaces of the outer ring fit is formed along one of the inner surfaces in the up-down direction in the guide groove.
The keyboard cover opening / closing device for a keyboard instrument according to claim 1, wherein: