JPH0128956B2 - - Google Patents
Info
- Publication number
- JPH0128956B2 JPH0128956B2 JP57086885A JP8688582A JPH0128956B2 JP H0128956 B2 JPH0128956 B2 JP H0128956B2 JP 57086885 A JP57086885 A JP 57086885A JP 8688582 A JP8688582 A JP 8688582A JP H0128956 B2 JPH0128956 B2 JP H0128956B2
- Authority
- JP
- Japan
- Prior art keywords
- key
- engagement recess
- keyboard frame
- insertion hole
- spring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000003780 insertion Methods 0.000 claims description 45
- 230000037431 insertion Effects 0.000 claims description 45
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 238000007790 scraping Methods 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007665 sagging Methods 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 235000015067 sauces Nutrition 0.000 description 1
Landscapes
- Electrophonic Musical Instruments (AREA)
Description
【発明の詳細な説明】
この発明は押鍵操作時における鍵の傾き、ガタ
付き等を防止すると共に、鍵盤フレームに打抜き
形成された挿通孔のバリ取り加工もしくはバリを
隠すためのテープ貼着作業を不要ならしめるよう
にした電子楽器の鍵盤装置に関する。DETAILED DESCRIPTION OF THE INVENTION This invention prevents the keys from tilting or wobbling during key press operations, and also involves deburring the insertion holes punched into the keyboard frame or applying tape to hide the burrs. The present invention relates to a keyboard device for an electronic musical instrument that eliminates the need for.
従来から電子オルガン等の電子楽器における鍵
盤装置は、合成樹脂によつて一体に形成された複
数個の鍵と、プレス加工によつて製作され、上面
に前記複数個の鍵が上下方向に回動自在に配設さ
れる鍵盤フレームと、各鍵と鍵盤フレームとの間
に介在され鍵に常時復帰習性を付与する復帰用ば
ね等を備えている。この場合、各鍵はその後端部
に設けられた係合凹部を鍵盤フレームに打抜き形
成された挿通孔の一側縁もしくは支点板に係合さ
せ、この係合凹部を回動支点として回動するよう
に構成されている。すなわち、第1図は鍵盤フレ
ーム1の後端面に固定された支点板2によつて鍵
3を支持するように構成した従来例を示すもの
で、鍵3の後端部下面には支点板2の上端が係入
する略台形状の係合凹部4が設けられ、引張コイ
ルばねからなる復帰用ばね5により鍵3の前端部
が上昇するように該鍵3を常時付勢している。一
方、第2図は鍵盤フレーム1の後端部に折曲げ形
成によつて支点板2を一体に設け、この支点板2
に打抜き形成された挿通孔6に、鍵3の後端面に
一体に突設された突起7を挿入すると共に該突起
7の上面に設けられた係合凹部4を圧縮コイルば
ねからなる復帰用ばね5の力で前記挿通孔6上端
縁6aに係合させたものである。 Traditionally, keyboard devices in electronic musical instruments such as electronic organs have been manufactured by press working and a plurality of keys integrally formed of synthetic resin, with the plurality of keys on the top surface rotating in the vertical direction. The keyboard frame includes a freely disposed keyboard frame, and a return spring that is interposed between each key and the keyboard frame to give the keys a constant return habit. In this case, each key has an engagement recess provided at its rear end that engages with one side edge of an insertion hole punched in the keyboard frame or with a fulcrum plate, and the key is rotated using this engagement recess as a rotation fulcrum. It is configured as follows. That is, FIG. 1 shows a conventional example in which a key 3 is supported by a fulcrum plate 2 fixed to the rear end surface of a keyboard frame 1. A substantially trapezoidal engagement recess 4 into which the upper end of the key 3 engages is provided, and a return spring 5 made of a tension coil spring constantly biases the key 3 so that the front end of the key 3 rises. On the other hand, in FIG. 2, a fulcrum plate 2 is integrally provided at the rear end of the keyboard frame 1 by bending.
A protrusion 7 integrally protruding from the rear end surface of the key 3 is inserted into an insertion hole 6 punched and formed in the key 3, and a return spring made of a compression coil spring is inserted into the engagement recess 4 provided on the upper surface of the protrusion 7. The upper edge 6a of the insertion hole 6 is engaged with the upper end edge 6a of the insertion hole 6 with a force of 5.
しかるに、かかる従来の鍵盤装置においては、
いずれも鍵3の凹部4が支点板2の上端もしくは
挿通孔6の上端縁6aに復帰用ばね5の力だけで
支持されているので、押鍵時の力が鍵3の中心か
らずれた位置に作用すると、下方に回動させる力
の他に鍵3を左右方向に傾けようとする力が働
き、この力がばね力よりも強い場合には鍵3を簡
単に傾け、タツチ感を悪くすると同時に雑音を発
生させるという欠点があつた。 However, in such conventional keyboard devices,
In both cases, the recess 4 of the key 3 is supported by the upper end of the fulcrum plate 2 or the upper edge 6a of the insertion hole 6 only by the force of the return spring 5, so that the force when pressing the key is shifted from the center of the key 3. When this happens, in addition to the force that rotates the key 3 downward, there is also a force that tends to tilt the key 3 in the left-right direction, and if this force is stronger than the spring force, the key 3 will be tilted easily and the touch feeling will deteriorate. At the same time, it had the disadvantage of generating noise.
そこで、このような欠点を防ぐ方法として第3
図に示すような鍵盤装置が知られている。この鍵
盤装置は鍵盤フレーム1の表面に挿通孔6を設
け、鍵3の後端部下面に一体に設けられた取付足
8を前記挿通孔6に挿入すると共に係合凹部4を
挿通孔6の後端縁6bに復帰用ばね5の力で係合
させたものである。このような鍵盤装置によれ
ば、鍵3は復帰用ばね5によつて時計方向の回動
習性が付与されると同時に後方にも付勢されるた
め、鍵3の傾きが凹部4を構成する上下の両側壁
部4a,4bと、挿通孔6の後端縁6b部分とで
ほぼ完全に規制される。したがつて、鍵3のガタ
付きおよび雑音が少なく、良好な鍵操作を行うこ
とができるという点で、第1図および第2図に示
した従来例よりも優れていると云えるが、反面回
動支点部の耐久性が悪いという別の問題を有して
いる。 Therefore, as a method to prevent such drawbacks, the third method is
A keyboard device as shown in the figure is known. In this keyboard device, an insertion hole 6 is provided on the surface of a keyboard frame 1, and a mounting foot 8 integrally provided on the lower surface of the rear end of the key 3 is inserted into the insertion hole 6, and the engaging recess 4 is inserted into the insertion hole 6. It is engaged with the rear end edge 6b by the force of the return spring 5. According to such a keyboard device, the key 3 is given a clockwise rotational habit by the return spring 5 and is also urged backward, so that the inclination of the key 3 forms the recess 4. It is almost completely regulated by the upper and lower side walls 4a, 4b and the rear end edge 6b of the insertion hole 6. Therefore, it can be said that this is superior to the conventional examples shown in FIGS. 1 and 2 in that the key 3 has less rattling and noise and can perform good key operations, but on the other hand, Another problem is that the rotation fulcrum has poor durability.
すなわち、鍵盤フレーム1は通常金属板によつ
て形成され、挿通孔6をプレス機械により打抜き
形成しているので、第4図a,bに示す如く挿通
孔6の端縁全周に亘つてダレ9とバリ10が必然
的に発生する。なお、a図は鍵盤フレーム1の表
面側から挿通孔6を打抜き、b図は裏面側から打
抜いた場合を示す。このようなダレ9とバリ10
のうち、特にバリ10は鍵盤フレーム1の表面も
しくは裏面側に突出するものであるため、係合凹
部4が挿通孔6の後端縁6bに当接すると、前記
バリ10は側壁部4aもしくは4bの根元部11
aまたは11bに当接する。したがつて、根元部
11aまたは11bは押鍵操作時に鍵3が回動す
ると、バリ10が食い込み、長期間使用している
間に徐々に削り取られていく。この削り取り現象
は、強く押鍵操作すればするほど、支点部、すな
わち係合凹部4のおどり現象が発生しやすくなる
ため著しくなり、凹部4の幅Wを増大させる。こ
の幅Wの増大化は、鍵3の上下方向のガタ付きを
招来し、さらにこのガタ付きがバリ10による削
り取りを促進させる。それ故、良好な鍵操作が得
られなくなり、雑音が発生するほか、削り取られ
た屑が鍵盤フレーム1の下方に配置されているキ
ースイツチ等に付着すると、接点不良を起し、発
音しなくなるなど楽器自体の性能、信頼性等に悪
影響を及ぼす。 That is, since the keyboard frame 1 is usually formed of a metal plate and the insertion hole 6 is punched out using a press machine, there is no sagging around the entire edge of the insertion hole 6 as shown in FIGS. 4a and 4b. 9 and burr 10 inevitably occur. Note that Figure A shows the case where the insertion hole 6 is punched out from the front side of the keyboard frame 1, and Figure B shows the case where it is punched out from the back side. This kind of sauce 9 and bari 10
Among them, the burr 10 in particular protrudes toward the front or back side of the keyboard frame 1, so when the engagement recess 4 comes into contact with the rear end edge 6b of the insertion hole 6, the burr 10 is caused to protrude toward the side wall 4a or 4b. Root part 11 of
a or 11b. Therefore, when the key 3 rotates during a key press operation, the burr 10 bites into the base portion 11a or 11b, and is gradually scraped off during long-term use. This scraping phenomenon becomes more severe as the key is pressed more strongly, because the fulcrum portion, that is, the engagement recess 4 is more likely to swing, thereby increasing the width W of the recess 4. This increase in width W causes the key 3 to rattle in the vertical direction, and this rattle further promotes scraping by the burr 10. Therefore, good key operation cannot be obtained, noise is generated, and if the scraped debris adheres to the keyswitch etc. located below the keyboard frame 1, it may cause contact failure and cause the instrument to not produce sound. This will have a negative impact on its own performance, reliability, etc.
そこで、バリ10を後加工によつて取り除いた
り、接着テープでバリ10を覆うようにすること
も考えられるが、その場合には余分な加工をした
りテープの貼着作業を必要とするため、製造コス
トが高くつくという不都合が生じる。また、第3
図に示した支点部構造においては、係合凹部4が
アンダーカツト部を構成するため、スライドコア
を必要とし、成形金型が複雑で高価になると同時
にそのメインテナンスも非常に面倒であるなど多
くの欠点があつた。 Therefore, it is possible to remove the burr 10 through post-processing or cover the burr 10 with adhesive tape, but in that case, extra processing and tape attachment work are required. This results in the inconvenience of high manufacturing costs. Also, the third
In the fulcrum structure shown in the figure, since the engagement recess 4 constitutes an undercut, a slide core is required, which makes the mold complicated and expensive, and its maintenance is also very troublesome. There were flaws.
この発明は上述したような点に鑑みてなされた
もので、鍵の傾き、バリによる削り取り並びに雑
音の発生を防止し、安定かつ良好な押鍵操作を得
ると共にスライドコア、バリ取り作業等を必要と
せず安価に製造し得るようにした電子楽器の鍵盤
装置を提供するものであり、その特徴とするとこ
ろは、鍵盤フレーム上に上下方向に回動自在に配
設された鍵と、この鍵に復帰習性を付与する復帰
用ばねとを備え、前記鍵の後端部に互いに協働し
て鍵の回動支点部を構成する係合凹部と山形受部
とを設けてなり、前記係合凹部は前記鍵盤フレー
ムに打抜き形成された挿通孔の一端縁に当接する
底面部と、前記鍵盤フレームのダレ発生側表面で
前記挿通孔の周縁部に対向する傾斜した側壁部と
からなり、前記山形受部は前記係合凹部に対して
鍵の幅方向にずれて設けられ、その2つの斜面の
うち前記側壁部側に位置する斜面が前記鍵盤フレ
ームのバリ発生側表面で前記挿通孔の周縁部に対
向して前記係合凹部の他方の側壁部を実質的に構
成し、かつ山形受部の稜線部を前記鍵盤フレーム
のバリ発生側表面で前記挿通孔の周縁部に当接さ
せるようにしたものである。 This invention was made in view of the above-mentioned points, and prevents the inclination of keys, scraping due to burrs, and noise generation, provides stable and good key pressing operation, and eliminates the need for slide cores, deburring work, etc. This provides a keyboard device for an electronic musical instrument that can be manufactured at low cost without having to use the keyboard frame. a return spring that imparts a return habit, and an engagement recess and a chevron-shaped receiving part that cooperate with each other to constitute a rotational fulcrum of the key are provided at the rear end of the key, the engagement recess consists of a bottom portion that comes into contact with one end edge of the insertion hole punched in the keyboard frame, and an inclined side wall portion that faces the peripheral edge of the insertion hole on the sagging side surface of the keyboard frame; The portion is provided to be offset in the width direction of the key with respect to the engagement recess, and of the two slopes, the slope located on the side wall portion side is on the burr generation side surface of the keyboard frame and is located at the peripheral edge of the insertion hole. opposing sides substantially forming the other side wall of the engagement recess, and causing the ridgeline part of the chevron-shaped receiving part to abut against the peripheral edge of the insertion hole on the burr-generating side surface of the keyboard frame. It is.
以下、この発明を図面に示す実施例に基づいて
詳細に説明する。 Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
第5図はこの発明に係る鍵盤装置の第1実施例
を示す断面図、第6図は鍵の底面図である。これ
らの図において、21は合成樹脂で一体に形成さ
れた鍵で、この鍵21は裏面部をくり抜くような
状態で形成されることにより断面形状が略コ字状
を呈し、後端部下面には該鍵21の両側板21
a,21bよりも下方に延在する突起22が設け
られ、かつこの突起22の前面には回動支点部を
構成する係合凹部23が設けられている。さらに
前記突起22および係合凹部23の詳細な構成を
第7図および第8図に基づいて説明すると、突起
22は前記両側板21a,21bの内側面に沿つ
て略角筒状に突設されることにより、前記内側面
間の間隔と同一の幅を有する。そして、係合凹部
23は突起22の幅方向全長に亘つて形成され、
1つの側壁部25と、突起22の前面22aと同
一平面をなす垂直な底面27を有している。側壁
部25は前記突起22の前面下端部に前方に向つ
て突設された突条部26の上面によつて構成され
るもので、第7図に示す如く左下りに傾斜し、鍵
盤フレーム1の後述する挿通孔31のバリ発生側
表面とは反対側の表面、すなわちダレ発生側表面
で挿通孔31の周縁部に対向している。前記底面
27の高さhは鍵盤フレーム1の板厚tとほぼ等
ししく(h=t)設定されている。この場合、前
記高さhは鍵21の両側板21a,21bの後端
部下端側にそれぞれ設けられた略∨字形の山形受
部28と、前記側壁部25とによつて設定され
る。前記山形受部28はその稜線部28Aが係合
凹部23の底面27と一致する如く形成され、こ
の稜線部28Aより前方側の斜面29が前記係合
凹部23の上側の側壁部を実質的に構成してい
る。なお、鍵21の後端部には第5図に示すよう
に該鍵2の上下面に開口する金型抜孔30が形成
されており、この抜孔30によつて前記係合凹部
23の形成を可能にしている。したがつて、係合
凹部23はスライドコアを用いることなく、上下
一対の金型のみによつて簡単に形成される。 FIG. 5 is a sectional view showing a first embodiment of the keyboard device according to the present invention, and FIG. 6 is a bottom view of the key. In these figures, reference numeral 21 denotes a key integrally formed of synthetic resin, and the key 21 is formed by hollowing out the back surface, so that the cross-sectional shape is approximately U-shaped, and there is a key on the bottom surface of the rear end. are both side plates 21 of the key 21
A protrusion 22 is provided that extends downward from a and 21b, and an engagement recess 23 that constitutes a rotation fulcrum is provided on the front surface of this protrusion 22. Further, the detailed structure of the projection 22 and the engagement recess 23 will be explained based on FIGS. 7 and 8. The projection 22 is provided in a substantially rectangular cylindrical shape to protrude along the inner surfaces of the side plates 21a and 21b. By this, the width is the same as the distance between the inner surfaces. The engagement recess 23 is formed over the entire length of the protrusion 22 in the width direction,
It has one side wall portion 25 and a vertical bottom surface 27 that is flush with the front surface 22a of the protrusion 22. The side wall portion 25 is constituted by the upper surface of a protrusion portion 26 that protrudes forward from the lower end of the front surface of the protrusion 22, and is inclined downwardly to the left as shown in FIG. The surface of the insertion hole 31 on the opposite side to the burr generation side surface, which will be described later, is opposite to the peripheral edge of the insertion hole 31 on the sag generation side surface. The height h of the bottom surface 27 is set to be approximately equal to the thickness t of the keyboard frame 1 (h=t). In this case, the height h is set by the substantially ∨-shaped chevron-shaped receiving portions 28 provided at the lower end sides of the rear ends of both side plates 21a and 21b of the key 21, and the side wall portions 25. The chevron-shaped receiving portion 28 is formed such that its ridgeline portion 28A coincides with the bottom surface 27 of the engagement recess 23, and the slope 29 on the front side of the ridgeline portion 28A substantially covers the upper side wall portion of the engagement recess 23. It consists of Furthermore, as shown in FIG. 5, the rear end of the key 21 is formed with a mold extraction hole 30 that opens on the upper and lower surfaces of the key 2, and this extraction hole 30 allows the formation of the engagement recess 23 to be made. It makes it possible. Therefore, the engagement recess 23 is easily formed using only a pair of upper and lower molds without using a slide core.
前記鍵盤フレーム1の後端部表面には前記突起
22に対応して矩形の挿通孔31が打抜き形成さ
れており、この挿通孔31によつて鍵21を上下
方向に回動自在に支持している。すなわち、鍵2
1は突起22を上方から挿通孔31に挿入して前
方に移動させ、係合凹部23の底面27を挿通孔
31の前端縁33に密接させることにより、前記
係合凹部23を回動支点0として回動自在に配設
され、側壁部25換言すれば突条部26が挿通孔
31の周縁部裏面側に位置することにより上方へ
の抜けを防止される。そして、山形受部28の各
稜線部28Aは挿通孔31の周縁部表面に当接
し、これと前記突条部26とで鍵21の上下方向
のガタ付きを防止する。なお、鍵21の左右方向
のガタ付きは前記挿通孔31の幅を突起22とほ
ぼ同一もしくは若干大きく形成することにより規
制防止される。再び第5図および第6図に戻つて
鍵21の構成を説明すると、この鍵21はさらに
前記両側板21a,21bの前端部下面に垂設さ
れた略鉤形のストツパ35を有し、このストツパ
35の下端部は鍵盤フレーム1の前面部に穿設さ
れた透孔60に上下移動自在に係入されている。
したがつて、鍵21は透孔60の高さ寸法の範因
で小角度上下方向の回動が許容され、後述する復
帰用ばね36の力により常時第5図時計方向の復
帰習性が付与されている。そして、鍵21の前端
部を復帰用ばね36に抗して押圧操作すると、該
鍵21は係合凹部23を回動支点0として反時計
方向に回動降下し、これに伴つて一方の側板21
bに垂設されたアクチユエータ37が鍵盤フレー
ム1に固定されている鍵スイツチ38を動作させ
ることにより、鍵21に対応した楽音を電気的に
発生させるように構成されている。 A rectangular insertion hole 31 is punched out on the rear end surface of the keyboard frame 1 in correspondence with the projection 22, and the key 21 is supported by the insertion hole 31 so as to be rotatable in the vertical direction. There is. That is, key 2
1 inserts the protrusion 22 into the insertion hole 31 from above and moves it forward, bringing the bottom surface 27 of the engagement recess 23 into close contact with the front edge 33 of the insertion hole 31, thereby moving the engagement recess 23 to the pivot point 0. The side wall portion 25, in other words, the protrusion portion 26 is located on the back side of the peripheral edge of the insertion hole 31, thereby preventing it from coming off upward. Each ridge line portion 28A of the chevron-shaped receiving portion 28 comes into contact with the peripheral surface of the insertion hole 31, and this and the protrusion portion 26 prevent the key 21 from shaking in the vertical direction. Note that rattling of the key 21 in the left-right direction can be prevented by forming the width of the insertion hole 31 to be approximately the same as or slightly larger than the protrusion 22. Returning again to FIGS. 5 and 6, the structure of the key 21 will be explained. This key 21 further has a substantially hook-shaped stopper 35 hanging from the lower surface of the front end of the side plates 21a, 21b. The lower end of the stopper 35 is engaged in a through hole 60 formed in the front surface of the keyboard frame 1 so as to be movable up and down.
Therefore, the key 21 is allowed to rotate by a small angle in the vertical direction due to the height dimension of the through hole 60, and is always given a return habit in the clockwise direction in FIG. 5 by the force of the return spring 36, which will be described later. ing. Then, when the front end of the key 21 is pressed against the return spring 36, the key 21 rotates downward in the counterclockwise direction with the engagement recess 23 as the rotation fulcrum 0, and as a result, one side plate 21
An actuator 37 installed vertically at b operates a key switch 38 fixed to the keyboard frame 1, thereby electrically generating a musical tone corresponding to the key 21.
前記鍵21の内底面40の中央部には前後方向
に長い一対のばね受け壁41,42が垂設されて
おり、その下端は図に示す如く円弧状に彎曲して
いる。また、これら一対のばね受け壁41,42
の先端部下端にはそれぞれ突起43,44が垂設
されており、これら一対の突起43,44と前記
ばね受壁41,42の先端部下端とで鍵21のば
ね係止部45を構成している。 A pair of spring receiving walls 41 and 42 which are long in the front and back direction are vertically provided at the center of the inner bottom surface 40 of the key 21, and the lower ends thereof are curved in an arc shape as shown in the figure. Moreover, these pair of spring receiving walls 41, 42
Projections 43 and 44 are provided vertically at the lower ends of the tips of the key 21, and these pair of projections 43 and 44 and the lower ends of the tips of the spring receiving walls 41 and 42 constitute a spring locking portion 45 of the key 21. ing.
前記復帰用ばね36は適宜な板厚の金属板を打
抜くことにより第9図に示す如き形状の平板ばね
からなり、その一端36Aが鍵21のばね係止部
45によつて回動可能に係止され、他端36Bが
鍵盤フレーム1に設けられた後述するばね係止部
46に挿入されかつ回動可能に係止されている。
前記復帰用ばね36の一端36Aおよび他端36
Bの幅W2はばね本体36Cの幅よりも小さく、
かつ前記一対の突起43,44の間隔Dより幾分
小さく設定されている。そして、復帰用ばね36
の一端36Aは前記一対の突起43,44間に後
方から挿入された形でばね係止部45に回動可能
に係止される。この時、ばね本体36Cと一端3
6Aの境部に設けられた段部49,50が前記一
対の突起43,44の背面に当接する。 The return spring 36 is made of a flat spring having a shape as shown in FIG. 9 by punching out a metal plate of an appropriate thickness, and one end 36A of the return spring 36 is rotatable by a spring locking portion 45 of the key 21. The other end 36B is inserted into a later-described spring locking portion 46 provided on the keyboard frame 1 and is rotatably locked.
One end 36A and the other end 36 of the return spring 36
The width W2 of B is smaller than the width of the spring body 36C,
In addition, the distance D between the pair of protrusions 43 and 44 is set to be somewhat smaller. And the return spring 36
One end 36A is inserted between the pair of protrusions 43 and 44 from behind and is rotatably locked to a spring locking portion 45. At this time, the spring body 36C and one end 3
Step portions 49 and 50 provided at the border of 6A abut against the back surfaces of the pair of projections 43 and 44.
前記鍵盤フレーム1のばね係止部46は鍵21
の回動支点0と鍵21のばね係止部45との間に
位置して設けられ、復帰用ばね36の他端36B
を第10図に示すように回動可能に係止してい
る。すなわち、このばね係止部45は鍵盤フレー
ム1に設けられた略T字形のばね用孔51と、こ
のばね用孔51の巾が狭い方の両側縁の一部を図
に示す如く上方に折り曲げることにより設けられ
た左右一対のばね受段部52A,52Bとで構成
され、これら一対のばね受段部52A,52Bに
より復帰用ばね36の他端36Bとばね本体36
Cとの境部に設けられた段部53,54を回動可
能に受け止め、かつ該ばねの下方への抜けを防止
している。 The spring locking portion 46 of the keyboard frame 1 is connected to the key 21.
and the other end 36B of the return spring 36.
is rotatably locked as shown in FIG. That is, this spring locking part 45 is formed by bending a substantially T-shaped spring hole 51 provided in the keyboard frame 1 and a part of the narrower side edges of this spring hole 51 upward as shown in the figure. The other end 36B of the return spring 36 and the spring body 36 are configured by a pair of left and right spring receiving steps 52A, 52B.
It rotatably receives stepped portions 53 and 54 provided at the boundary with C, and prevents the spring from coming off downward.
前記復帰用ばね36は組込前の自然状態におい
て平板状態を保ち、鍵21と鍵盤フレーム1との
間に座屈変形した状態で装着される。これは鍵2
1のばね係止部45と鍵盤フレーム1のばね係止
部46間の距離が復帰用ばね36のばね本体36
Cの長さLより幾分短かく設定されているため
で、鍵21の装着時にばね係止部45で長手方向
に圧縮させることにより、復帰用ばね36が第5
図に示す如く円弧状に座屈変形し、この変形によ
り生じるばね36の反力Pによつて鍵21に復帰
力を与えている。この場合、反力Pは鍵21の回
動支点0とばね係止部45を結んだ方向およびそ
れとは直角な方向の分力P1,P2を持ち、P1が鍵
21を上方に付勢する力となり、この時の回転モ
ーメントP1×L(但しLは回動支点0からばね係
止部45までの距離)がP×lと等しくなる。一
方、P2は鍵21の係合凹部23を挿通孔31の
前縁に圧接する。但し、P2の垂直分力は係合凹
部23の下部に設けた突条部26を上下に付勢
し、挿通孔31の前縁裏面側に圧接する。 The return spring 36 maintains a flat plate state in its natural state before being assembled, and is installed between the key 21 and the keyboard frame 1 in a buckled state. This is key 2
The distance between the spring locking part 45 of 1 and the spring locking part 46 of the keyboard frame 1 is the spring body 36 of the return spring 36.
This is because the length C is set to be somewhat shorter than the length L, and when the key 21 is attached, the return spring 36 is compressed in the longitudinal direction by the spring locking part 45.
As shown in the figure, the key 21 is buckled and deformed in an arc shape, and the reaction force P of the spring 36 generated by this deformation applies a restoring force to the key 21. In this case, the reaction force P has component forces P 1 and P 2 in the direction connecting the rotational fulcrum 0 of the key 21 and the spring locking part 45, and in a direction perpendicular thereto, and P 1 causes the key 21 to be pushed upward. At this time, the rotational moment P 1 ×L (where L is the distance from the rotational fulcrum 0 to the spring locking portion 45) becomes equal to P×l. On the other hand, P 2 presses the engagement recess 23 of the key 21 against the front edge of the insertion hole 31. However, the vertical component of P 2 urges the protrusion 26 provided at the lower part of the engagement recess 23 up and down, and presses it against the back side of the front edge of the insertion hole 31 .
この場合、復帰用ばね36を座屈直後の状態で
組込むと、鍵タツチ感が従来の圧縮コイルばね、
引張コイルばね等を用いた場合に比べて相対的に
軽くなり、一般のピアノにより近似したタツチ感
を得ることができる。すなわち、板ばねを長手方
向に圧縮し続けてある荷重に達すると、板ばねが
突然座屈を起して曲り始め、この座屈を起す時の
荷重を座屈限界荷重と呼び、座屈開始後は荷重を
増さなくとも次第に曲がりが大きくなり、板ばね
の反力が減少する傾向を示す。したがつて、鍵2
1を押し切つた時第11図に示すように鍵21の
回動支点0と復帰用ばね36の回動支点(ばね係
止部46)とのずれに伴いΔdだけ長手方向にた
わんでも、このΔdは極めて小さく、圧縮コイル
ばね、引張コイルばねのように変位量に比例して
反力P′が著しく増大せず、またばね係止部45の
降下によりP′がPより水平に近くなり、鍵21を
持ちあげようとするモーメントがより小さくなる
ので、結果として鍵21を押し込むにしたがつて
鍵タツチ感が軽くなる。 In this case, if the return spring 36 is installed immediately after buckling, the key touch feeling will be similar to that of a conventional compression coil spring.
It is relatively lighter than when a tension coil spring or the like is used, and it is possible to obtain a touch feeling more similar to that of a general piano. In other words, when the leaf spring continues to be compressed in the longitudinal direction and reaches a certain load, the leaf spring suddenly buckles and begins to bend. After that, the bending gradually increases without increasing the load, and the reaction force of the leaf spring tends to decrease. Therefore, key 2
1, as shown in FIG. 11, even if the key 21 bends in the longitudinal direction by Δd due to the deviation between the rotational fulcrum 0 of the key 21 and the rotational fulcrum of the return spring 36 (spring locking part 46). Δd is extremely small, and unlike compression coil springs and tension coil springs, the reaction force P' does not increase significantly in proportion to the amount of displacement, and due to the lowering of the spring locking part 45, P' becomes closer to the horizontal than P. Since the moment of trying to lift the key 21 becomes smaller, as a result, as the key 21 is pushed in, the touch feeling of the key becomes lighter.
前記鍵盤フレーム1にはさらにばね係止片61
が設けられている。このばね係止片61は鍵21
の設置前において復帰用ばね36の一端36Aを
仮係止するためのもので、例えば鍵盤フレーム1
の一部を切起することにより該フレームに一体に
設けられて上方に延在し、ゴム、軟質合成樹脂等
からなる被覆体62が被冠されている。また、ば
ね係止片61は復帰用ばね36の僅か前方に位置
し、押鍵操作時に該ばね36の一端36Aが被覆
体62と接触しないようになつている。そして、
前記ばね係止片61は鍵21の下面開口部より内
部に挿入されることにより、キーガイドとしての
機能を果し鍵21の左右方向への回動を規制防止
する。なお、被覆体62を用いず、直接ばね係止
片61で復帰用ばね36の一端36Aを仮係止す
る場合には一定の位置で係止し得るように凹部を
設けるとよい。 The keyboard frame 1 further includes a spring locking piece 61.
is provided. This spring locking piece 61 is attached to the key 21
This is for temporarily locking one end 36A of the return spring 36 before installing the keyboard frame 1.
A covering member 62 made of rubber, soft synthetic resin, or the like is provided integrally with the frame by cutting and bending a portion thereof and extending upwardly. Further, the spring locking piece 61 is located slightly in front of the return spring 36, so that the one end 36A of the spring 36 does not come into contact with the cover 62 when the key is pressed. and,
The spring locking piece 61 is inserted into the interior of the key 21 through the opening on the lower surface thereof, thereby functioning as a key guide and preventing the key 21 from rotating in the left-right direction. In addition, when temporarily locking one end 36A of the return spring 36 directly with the spring locking piece 61 without using the cover 62, it is preferable to provide a recess so that the spring can be locked at a certain position.
前記復帰用ばね36は鍵21の設置前において
鍵盤フレーム1の下方よりばね用孔51に挿入さ
れ、その一端36Aが被覆体62の背面に第5図
一点鎖線63で示す如く当接し、他端36Bが鍵
盤フレーム1のばね係止部46によつて係止され
ることにより、鍵盤フレーム1上に座屈変形した
状態で仮固定される。次に、鍵21を前下りに傾
斜させた状態でストツパ35を透孔60に差し込
んで、鍵21の後端部を下げていくと、その途中
で一対の突起43,44が復帰用ばね36の一端
36Aの両側に下つてきて該突起43,44の背
面で段部49,50(第9図参照)を押圧する。
このため、復帰用ばね36は第5図一点鎖線63
で示す状態よりさらに圧縮されて変形し、その一
端の36Aが被覆体62から離れ、これを鍵21
のばね係止部45が係止する。そして、鍵21の
後端部をさらに下げていくと、突起22が挿通孔
31に差し込まれ、復帰用ばね36の反力により
鍵21が僅かに前方に移動し係合凹部23が挿通
孔31の前縁に係合することにより、鍵21の取
付け作業を完了する。 The return spring 36 is inserted into the spring hole 51 from below the keyboard frame 1 before the key 21 is installed, and its one end 36A abuts against the back surface of the cover 62 as shown by the dashed line 63 in FIG. 5, and the other end 36B is locked by the spring locking portion 46 of the keyboard frame 1, so that it is temporarily fixed on the keyboard frame 1 in a buckled and deformed state. Next, with the key 21 tilted forward and downward, the stopper 35 is inserted into the through hole 60 and the rear end of the key 21 is lowered. come down on both sides of one end 36A and press the stepped portions 49, 50 (see FIG. 9) with the back surfaces of the protrusions 43, 44.
For this reason, the return spring 36 is connected to the dashed line 63 in FIG.
36A is further compressed and deformed than the state shown in FIG.
The spring locking portion 45 locks. When the rear end of the key 21 is further lowered, the protrusion 22 is inserted into the insertion hole 31, and the key 21 moves slightly forward due to the reaction force of the return spring 36, and the engagement recess 23 is inserted into the insertion hole 31. The installation operation of the key 21 is completed by engaging the front edge of the key 21.
かくして、このような構成からなる鍵盤装置に
よれば、鍵21を安定かつ確実に支持することが
でき、良好な押鍵操作を可能にする。すなわち、
第12図に示すように挿通孔31を鍵盤フレーム
1の裏面側から打抜いてバリ10を表面側に突出
させた場合、このバリ10によつて削り取られる
部分は係合凹部23の底面27の一部だけで、鍵
21の下方への移動を規制している山形受部28
の稜線部28Aは係合凹部23の側方に位置して
挿通孔31の周縁部表面に当接しているため、バ
リ10によつて削り取られることがなく(実際に
は挿通孔31の開口端縁に当接する内側端が若干
削り取られるが、側板21a,21bの板厚と等
しい長さを有しているため無視し得る)、係合凹
部23の底面27の高さhを一定に保持する。こ
れは、係合凹部23と、この係合凹部23の両側
に設けられた山形受部28によつて回動支点部を
構成した結果、バリ10の存在を実事上無視し得
るためで、鍵21のガタ付き、雑音等の発生を防
止する。なお、バリ10によつて底面27と稜線
部28Aの一部が削り取られるが、これは一定量
削り取られると、それ以上には削り取られること
がなく、また削り取られた部分が鍵21の回動支
点を構成しないため、鍵21の押鍵操作に何ら悪
影響を及ぼすことがない。この結果、鍵21の回
動支点部の耐久性が飛躍的に向上し、バリ取り加
工、テープ貼着作業等を不要にする。また、係合
凹部23をスライドコアを用いずに成形すること
ができるので、金型の製造、メインテナンス等が
容易で、安価に製作し得る。加えて、突起22の
突条部26と山形受部28により、鍵21の左右
方向の傾きを防止できる。 According to the keyboard device having such a configuration, the keys 21 can be supported stably and reliably, allowing for good key pressing operations. That is,
When the insertion hole 31 is punched out from the back side of the keyboard frame 1 and the burr 10 is made to protrude to the front side as shown in FIG. Chevron receiver 28 that restricts the downward movement of the key 21 only in part
Since the ridgeline portion 28A is located on the side of the engagement recess 23 and is in contact with the peripheral surface of the insertion hole 31, it is not scraped off by the burr 10 (actually, the opening end of the insertion hole 31 Although the inner end that contacts the edge is slightly scraped off, it can be ignored because the length is equal to the thickness of the side plates 21a and 21b), and the height h of the bottom surface 27 of the engagement recess 23 is kept constant. . This is because the presence of the burr 10 can be practically ignored as a result of the rotation fulcrum being formed by the engagement recess 23 and the chevron-shaped receivers 28 provided on both sides of the engagement recess 23. To prevent the key 21 from rattling and from generating noise. Note that a part of the bottom surface 27 and the ridgeline 28A are scraped off by the burr 10, but once a certain amount is scraped off, no more is scraped off, and the scraped part is used to prevent the rotation of the key 21. Since it does not constitute a fulcrum, there is no adverse effect on the key pressing operation of the key 21. As a result, the durability of the pivot portion of the key 21 is dramatically improved, and deburring, tape attachment, etc. are no longer necessary. Furthermore, since the engaging recess 23 can be molded without using a slide core, manufacturing and maintenance of the mold are easy and can be manufactured at low cost. In addition, the ridge portion 26 of the protrusion 22 and the chevron-shaped receiving portion 28 can prevent the key 21 from tilting in the left-right direction.
この鍵21の左右方向の傾きをより確実に防止
する方法としては、第13図に示すように底面2
7の高さH(斜面25の根元部から稜線部28A
までの寸法で、これら両部が回動支点をなす)を
鍵盤フレーム1の板厚tよりも若干小さく(H<
t)設定すると共に稜線部28Aを底面27より
d1だけ前方にずらすとよい。この場合、係合凹部
23が挿通孔31の前端縁33に食い込む格好に
なり、鍵盤フレーム1との間で生じる滑り効果に
よるフリクシヨンが僅かながら発生することにな
るが、鍵21の上下方向および左右方向のガタ付
きを完全に防止することができる。 As a way to more reliably prevent the key 21 from tilting in the left and right direction, as shown in FIG.
7 height H (from the root of the slope 25 to the ridgeline 28A)
These two parts form the pivot point) are slightly smaller than the plate thickness t of the keyboard frame 1 (H<
t) At the same time as setting the ridgeline part 28A from the bottom surface 27
It is better to shift it forward by d 1 . In this case, the engagement recess 23 will bite into the front edge 33 of the insertion hole 31, and a slight friction will occur due to the sliding effect between it and the keyboard frame 1. It is possible to completely prevent directional wobbling.
一方、前記高さHを板厚tよりも若干大きく
(H>t)設定した場合には、係合凹部23の挿
通孔31に食い込む力が非常に小さいため、鍵盤
フレーム1との間の滑り効果によるフリクシヨン
は発生しにくく、クリアな支点構造を得ることが
可能である。但し、この場合には、鍵21の左右
方向の傾きが多少犠性になる。 On the other hand, when the height H is set to be slightly larger than the plate thickness t (H>t), the force of the engagement recess 23 biting into the insertion hole 31 is very small, so that slippage between the engagement recess 23 and the keyboard frame 1 may occur. Friction due to the effect is less likely to occur, and it is possible to obtain a clear fulcrum structure. However, in this case, the inclination of the key 21 in the left-right direction becomes a slight sacrifice.
なお、高さHを変えてもバリ10により削られ
る部分は、前述した通り、鍵21の回動支点にと
つて何ら支障をきたす部分ではないので、回動支
点部の耐久性を損うことはない。 Note that even if the height H is changed, the portion that is shaved by the burr 10 does not pose any problem to the pivot point of the key 21, as described above, so the durability of the pivot point portion may be impaired. There isn't.
第14図はこの発明の第2実施例を示す要部斜
視図である。この実施例は突起22の背面下端部
側に係合凹部23を設け、この係合凹部23を挿
通孔31の後端縁70に図示しない復帰用ばねの
力で係合させた点が前述した第1実施例と異なる
だけで、他は全く同一に構成されている。この場
合、復帰用ばねとしては鍵21を後方に付勢する
必要があるので、第3図に示したようなばねの取
付け構造が採用される。 FIG. 14 is a perspective view of essential parts showing a second embodiment of the invention. As mentioned above, in this embodiment, the engagement recess 23 is provided on the lower end side of the back surface of the protrusion 22, and this engagement recess 23 is engaged with the rear end edge 70 of the insertion hole 31 by the force of a return spring (not shown). This embodiment is different from the first embodiment and has the same structure in other respects. In this case, since it is necessary for the return spring to bias the key 21 backward, a spring mounting structure as shown in FIG. 3 is adopted.
このような構成においても、挿通孔31の周縁
部表面側に太線に示す如くバリ10を発生させて
おけば、鍵21の回動支点、すなわち側壁部25
の根元部25aと稜線部28Aを何ら削り取るこ
とがなく、第1実施例と同様の効果が得られるこ
とは明らかであろう。 Even in such a configuration, if the burr 10 is generated on the surface side of the peripheral edge of the insertion hole 31 as shown by the thick line, the rotation fulcrum of the key 21, that is, the side wall portion 25
It is clear that the same effect as in the first embodiment can be obtained without cutting off the root portion 25a and the ridgeline portion 28A.
第15図はこの発明の第3実施例を示す要部斜
視図である。この実施例は一対の突起75A,7
5Bを各側板21a,21bの後端部下面に連設
すると共にこれら一対の突起75A,75B間に
略∨字状の山形受部76を設けたものである。こ
の場合、一対の突起75A,75Bは略L字形に
形成されることにより突条部78を一体に有し、
この突条部78の上面78aと前記山形受部76
の後方側斜面76aとで係合凹部80の側壁部を
構成している。 FIG. 15 is a perspective view of main parts showing a third embodiment of the present invention. In this embodiment, a pair of protrusions 75A, 7
5B are provided in succession on the lower surface of the rear end of each side plate 21a, 21b, and a substantially ∨-shaped chevron-shaped receiving portion 76 is provided between the pair of projections 75A, 75B. In this case, the pair of protrusions 75A, 75B are formed into a substantially L-shape and integrally have a protrusion 78,
The upper surface 78a of this protruding portion 78 and the chevron receiving portion 76
The rear side slope 76a constitutes a side wall portion of the engagement recess 80.
一方、鍵盤フレーム1の表面には前記一対の突
起75A,75Bに対応して左右一対の長孔8
1,82が打抜き形成されており、これら長孔8
1,82の後端縁83に前記係合凹部80がそれ
ぞれ係合される。そして、この係合に伴つて山形
受部76の稜線部84は、鍵盤フレーム1の表面
でかつ長孔81,82の後端縁83を結ぶ直線上
に当接する。なお、各長孔81,82のバリ10
は鍵盤フレーム1の表面側に設けられる。 On the other hand, on the surface of the keyboard frame 1, a pair of left and right elongated holes 8 are formed corresponding to the pair of protrusions 75A and 75B.
1 and 82 are formed by punching, and these long holes 8
The engagement recesses 80 are respectively engaged with the rear end edges 83 of 1 and 82. As a result of this engagement, the ridgeline portion 84 of the chevron-shaped receiving portion 76 comes into contact with the surface of the keyboard frame 1 and on a straight line connecting the rear end edges 83 of the elongated holes 81 and 82. In addition, the burrs 10 of each long hole 81, 82
is provided on the front side of the keyboard frame 1.
このような構成においては、上記第1および第
2実施例に比べて十分長い稜線部84を有してい
るため、バリ10による影響を一層少なくし得、
回動支点部の耐久性を向上させることができると
いう利点を有している。 In such a configuration, since the ridge line portion 84 is sufficiently long compared to the first and second embodiments, the influence of the burr 10 can be further reduced.
This has the advantage that the durability of the rotation fulcrum can be improved.
第16図および第17図はこの発明の第4実施
例を示す要部斜視図およびA−A線断面図であ
る。この実施例は第15図に示した第3実施例の
変形例を示すもので、各突起75A,75Bの突
条部78を前方に向けて突設したものである。こ
の場合、各側板21a,21bには係合凹部80
を形成するための溝90が高さ方向に設けられ、
離型時における金型との干渉を防止している。 FIGS. 16 and 17 are a perspective view of a main part and a sectional view taken along the line A--A, showing a fourth embodiment of the present invention. This embodiment is a modification of the third embodiment shown in FIG. 15, in which the protrusions 78 of each protrusion 75A, 75B are provided to protrude forward. In this case, each side plate 21a, 21b has an engaging recess 80.
A groove 90 for forming a groove is provided in the height direction,
This prevents interference with the mold during mold release.
第18図および第19図はこの発明の第5実施
例を示す要部斜視図および断面図である。この実
施例は鍵21の後端面に突設された突起100の
上面に突条部101を一体に突設して係合凹部1
02を設けたものである。この場合、突起100
は両側板21a,21bの内側面間の間隔で形成
され、各側板21a,21bの後端面が略>の字
状に形成されることにより山形受部103を構成
している。そして、突起100は鍵盤フレーム1
の後端に一体に設けられた支点板2の挿通孔10
5に挿入されて、復帰用ばね106の力により係
合凹部102を前記挿通孔105の上端縁105
aに係合させる。この結果、係合凹部102の側
壁部、すなわち突条部101の傾斜した前面10
7が支点板2の背面側に位置して鍵21の抜けを
防止し、山形受部103の稜線部108が支点板
2の表面側に当接する。 FIGS. 18 and 19 are a perspective view and a sectional view of essential parts showing a fifth embodiment of the present invention. In this embodiment, a protrusion 101 is integrally provided on the upper surface of a protrusion 100 protruding from the rear end surface of the key 21, and an engagement recess 1 is provided.
02 is provided. In this case, the protrusion 100
is formed by the interval between the inner surfaces of the side plates 21a and 21b, and the rear end surfaces of each side plate 21a and 21b are formed in a substantially >-shape, thereby forming the chevron-shaped receiving portion 103. The protrusion 100 is the keyboard frame 1.
The insertion hole 10 of the fulcrum plate 2 is integrally provided at the rear end of the
5, the engagement recess 102 is inserted into the upper edge 105 of the insertion hole 105 by the force of the return spring 106.
a. As a result, the side wall portion of the engagement recess 102, that is, the inclined front surface 10 of the protrusion portion 101
7 is located on the back side of the fulcrum plate 2 to prevent the key 21 from coming off, and the ridgeline part 108 of the chevron-shaped receiving part 103 comes into contact with the front side of the fulcrum plate 2.
このような構成においても鍵21の回動支点部
が上面側に移つただけで、前述した第1〜第4実
施例と同様の効果が得られることは明らかであろ
う。 It will be obvious that even in such a configuration, the same effects as in the first to fourth embodiments described above can be obtained simply by moving the rotational fulcrum of the key 21 to the upper surface side.
第20図はこの発明の第6実施例を示す要部斜
視図である。この実施例は第5実施例とは逆に突
起100の下面に係合凹部102を設け、この係
合凹部102を挿通孔の下端縁105bに復帰用
ばね110の力により係合させたものである。な
お、他の構成については第18図および19図と
同一符号を付し、その説明を省略する。 FIG. 20 is a perspective view of essential parts showing a sixth embodiment of the present invention. In this embodiment, contrary to the fifth embodiment, an engagement recess 102 is provided on the lower surface of the projection 100, and this engagement recess 102 is engaged with the lower edge 105b of the insertion hole by the force of a return spring 110. be. Note that the other configurations are designated by the same reference numerals as in FIGS. 18 and 19, and their explanation will be omitted.
なお、第5および第6実施例においては係合凹
部102を突起100の上下面に設けているた
め、鍵21の左右方向の傾きが発生しやすいとい
う欠点はあるが、バリ10により回動支点が削り
取られることは他の実施例と同様全くないので、
回動支点の耐久性を確保し得る。 In the fifth and sixth embodiments, since the engagement recesses 102 are provided on the upper and lower surfaces of the protrusion 100, there is a drawback that the key 21 is likely to tilt in the left-right direction. As in other embodiments, there is no possibility that the
The durability of the rotation fulcrum can be ensured.
以上述べたようにこの発明に係る電子楽器の鍵
盤装置は、鍵の回動支点部を鍵の幅方向にずらし
て設けた係合凹部と山形受部とで構成したので、
打抜き加工時に挿通孔の周縁に発生したバリによ
り回動支点が削り取られることがなく、鍵の安定
かつ確実な押鍵操作を可能にすると共に回動支点
部の耐久性を向上させることができる。また、バ
リによる影響がないためバリ取り加工、テープ貼
着作業等を必要とせず、製造、組立作業が容易で
ある。さらに、係合凹部はアンダーカツト部を構
成せず、そのためスライドコアを使用しない簡単
な金型による成形を可能にし製造コストの低減が
計れるなど、その効果は非常に大である。 As described above, the keyboard device for an electronic musical instrument according to the present invention is composed of the engagement recess and the chevron-shaped receiver, in which the rotational fulcrum of the key is shifted in the width direction of the key.
The rotational fulcrum is not scraped off by burrs generated on the periphery of the insertion hole during punching, allowing stable and reliable key pressing operation and improving the durability of the rotational fulcrum. In addition, since there is no influence from burrs, there is no need for deburring, tape pasting, etc., and manufacturing and assembly are easy. Furthermore, the engagement recess does not constitute an undercut, and therefore, it is possible to mold with a simple mold that does not use a slide core, and the manufacturing cost can be reduced, which is very effective.
第1図〜第3図は従来の鍵盤装置の支持構造を
示す要部側面図、断面図および側断面図、第4図
a,bはバリによる影響を説明するための図、第
5図はこの発明に係る鍵盤装置の第1実施例を示
す断面図、第6図は鍵の底面図、第7図および第
8図は鍵の要部斜視図および背面図、第9図は復
帰用ばねの伸長状態における平面図、第10図は
鍵盤フレームのばね係止部を示す斜視図、第11
図は復帰用ばねの作用を説明するための図、第1
2図はこの発明の効果を説明するための図、第1
3図は係合凹部の底面高さを変えた変形例を示す
図、第14図はこの発明の第2実施例を示す要部
斜視図、第15図はこの発明の第3実施例を示す
要部斜視図、第16図および第17図はこの発明
の第4実施例を示す要部斜視図およびA−A線断
面図、第18図および第19図はこの発明の第5
実施例を示す要部斜視図および側断面図、第20
図はこの発明の第6実施例を示す要部斜視図であ
る。
1……鍵盤フレーム、21……鍵、22……突
起、23……係合凹部、25……側壁部、26…
…突条部、27……底面、28……山形受部、2
8A……稜線部、29……斜面、36……復帰用
ばね、80,102……係合凹部、76,103
……山形受部、84,108……稜線部。
Figures 1 to 3 are side views, sectional views, and side sectional views of main parts showing the support structure of a conventional keyboard device, Figures 4a and b are diagrams for explaining the effects of burrs, and Figure 5 is a diagram showing the support structure of a conventional keyboard device. 6 is a bottom view of the key, FIGS. 7 and 8 are perspective views and rear views of the main parts of the key, and FIG. 9 is a return spring. FIG. 10 is a perspective view showing the spring locking portion of the keyboard frame, and FIG.
The figure is a diagram for explaining the action of the return spring.
Figure 2 is a diagram for explaining the effects of this invention.
Fig. 3 is a diagram showing a modification in which the bottom height of the engaging recess is changed, Fig. 14 is a perspective view of main parts showing a second embodiment of the invention, and Fig. 15 is a diagram showing a third embodiment of the invention. 16 and 17 are perspective views of essential parts and sectional views taken along the line A-A, and FIGS. 18 and 19 are perspective views of main parts showing a fourth embodiment of the present invention.
Main part perspective view and side sectional view showing the embodiment, No. 20
The figure is a perspective view of essential parts showing a sixth embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Keyboard frame, 21...Key, 22...Protrusion, 23...Engagement recess, 25...Side wall part, 26...
...Protrusion portion, 27...Bottom surface, 28...Chevron receiving portion, 2
8A...Ridge line portion, 29...Slope, 36...Returning spring, 80, 102...Engagement recess, 76, 103
...Chevron receiving part, 84,108...Ridge line part.
Claims (1)
された鍵と、この鍵に復帰習性を付与する復帰用
ばねとを有する電子楽器の鍵盤装置において、前
記鍵の後端部に互いに協働して鍵の回動支点部を
構成する係合凹部と山形受部とを受けてなり、前
記係合凹部は前記鍵盤フレームに打抜き形成され
た挿通孔の一端縁に当接する底面部と、前記鍵盤
フレームのダレ発生側表面で前記挿通孔の周縁部
に対向する傾斜した側壁部とからなり、前記山形
受部は前記係合凹部に対して鍵の幅方向にずれて
設けられ、その2つの斜面のうち前記側壁部側に
位置する斜面が前記鍵盤フレームのバリ発生側表
面で前記挿通孔の周縁部に対向して前記係合凹部
の他方の側壁部を実質的に構成し、かつ山形受部
の稜線部が前記鍵盤フレームのバリ発生側表面で
前記挿通孔の周縁部に当接することを特徴とする
電子楽器の鍵盤装置。1. In a keyboard device for an electronic musical instrument, which has a key arranged on a keyboard frame so as to be freely rotatable in the vertical direction, and a return spring that imparts a return habit to the key, the rear end of the key is provided with a key that cooperates with each other. and receives an engagement recess and a chevron-shaped receiving part that constitute a rotation fulcrum of the key, and the engagement recess has a bottom surface that abuts one end edge of an insertion hole punched in the keyboard frame, and It consists of an inclined side wall part facing the peripheral edge of the insertion hole on the surface of the keyboard frame on the sag generation side, and the chevron-shaped receiving part is provided offset in the width direction of the key with respect to the engaging recess, and the two Among the slopes, the slope located on the side wall side substantially constitutes the other side wall of the engagement recess on the burr generation side surface of the keyboard frame, and substantially constitutes the other side wall of the engagement recess. A keyboard device for an electronic musical instrument, wherein a ridgeline portion of the keyboard frame contacts a peripheral edge of the insertion hole on a burr-generating side surface of the keyboard frame.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/446,491 US4476769A (en) | 1981-12-09 | 1982-12-03 | Keyboard apparatus in electronic musical instrument |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56196945A JPS5898784A (en) | 1981-12-09 | 1981-12-09 | Keyboard unit for electronic musical instrument |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS58100185A JPS58100185A (en) | 1983-06-14 |
JPH0128956B2 true JPH0128956B2 (en) | 1989-06-06 |
Family
ID=16366265
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56196945A Granted JPS5898784A (en) | 1981-12-09 | 1981-12-09 | Keyboard unit for electronic musical instrument |
JP57086885A Granted JPS58100185A (en) | 1981-12-09 | 1982-05-22 | Keyboard unit for electronic musical instrument |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56196945A Granted JPS5898784A (en) | 1981-12-09 | 1981-12-09 | Keyboard unit for electronic musical instrument |
Country Status (1)
Country | Link |
---|---|
JP (2) | JPS5898784A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59119496U (en) * | 1983-02-01 | 1984-08-11 | カシオ計算機株式会社 | key |
JPH0713035Y2 (en) * | 1986-11-17 | 1995-03-29 | ヤマハ株式会社 | Electronic musical instrument keyboard device |
US5380076A (en) * | 1990-02-14 | 1995-01-10 | Kabushiki Kaisha Komatsu Seisakusho | Rubber crawler belt of a tracked vehicle |
JPH0654086U (en) * | 1992-12-24 | 1994-07-22 | 株式会社河合楽器製作所 | Electronic musical instrument keyboard device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5429780U (en) * | 1977-07-29 | 1979-02-27 | ||
JPS5512228B2 (en) * | 1976-12-24 | 1980-03-31 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5930941Y2 (en) * | 1978-07-06 | 1984-09-03 | 松下電器産業株式会社 | Keyboard switch for electronic musical instruments |
JPS55175184U (en) * | 1979-06-01 | 1980-12-16 |
-
1981
- 1981-12-09 JP JP56196945A patent/JPS5898784A/en active Granted
-
1982
- 1982-05-22 JP JP57086885A patent/JPS58100185A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5512228B2 (en) * | 1976-12-24 | 1980-03-31 | ||
JPS5429780U (en) * | 1977-07-29 | 1979-02-27 |
Also Published As
Publication number | Publication date |
---|---|
JPS6410077B2 (en) | 1989-02-21 |
JPS5898784A (en) | 1983-06-11 |
JPS58100185A (en) | 1983-06-14 |
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