WO2018173219A1 - Keyboard weight, key unit, and method for manufacturing key unit - Google Patents

Keyboard weight, key unit, and method for manufacturing key unit Download PDF

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Publication number
WO2018173219A1
WO2018173219A1 PCT/JP2017/011841 JP2017011841W WO2018173219A1 WO 2018173219 A1 WO2018173219 A1 WO 2018173219A1 JP 2017011841 W JP2017011841 W JP 2017011841W WO 2018173219 A1 WO2018173219 A1 WO 2018173219A1
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WO
WIPO (PCT)
Prior art keywords
weight
key
caulking
keyboard
insertion hole
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Application number
PCT/JP2017/011841
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French (fr)
Japanese (ja)
Inventor
加藤　忠晴
世理子 二宮
Original Assignee
ヤマハ株式会社
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Filing date
Publication date
Application filed by ヤマハ株式会社 filed Critical ヤマハ株式会社
Priority to PCT/JP2017/011841 priority Critical patent/WO2018173219A1/en
Priority to CN201780088748.3A priority patent/CN110447064B/en
Priority to EP17901665.4A priority patent/EP3605522B1/en
Priority to JP2019506852A priority patent/JP6760482B2/en
Publication of WO2018173219A1 publication Critical patent/WO2018173219A1/en

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10C—PIANOS, HARPSICHORDS, SPINETS OR SIMILAR STRINGED MUSICAL INSTRUMENTS WITH ONE OR MORE KEYBOARDS
    • G10C3/00—Details or accessories
    • G10C3/12—Keyboards; Keys
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10B—ORGANS, HARMONIUMS OR SIMILAR WIND MUSICAL INSTRUMENTS WITH ASSOCIATED BLOWING APPARATUS
    • G10B3/00—Details or accessories
    • G10B3/12—Keys or keyboards; Manuals
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/32—Constructional details
    • G10H1/34—Switch arrangements, e.g. keyboards or mechanical switches specially adapted for electrophonic musical instruments
    • G10H1/344—Structural association with individual keys
    • G10H1/346—Keys with an arrangement for simulating the feeling of a piano key, e.g. using counterweights, springs, cams

Definitions

  • the present invention relates to a keyboard spindle, a key unit, and a key unit manufacturing method used for a keyboard instrument.
  • a metal weight used to adjust the weight of a key touch during performance is attached to each key of a keyboard instrument such as a piano.
  • the keyboard weight is inserted and fixed in a through hole penetrating the key from side to side.
  • the keyboard weight is attached to the key so that, for example, the lower key of the keyboard is heavier and the higher key is lighter, thereby improving the touch feeling during performance.
  • FIGS. 1A and 1B of Patent Document 1 disclose a configuration in which cylindrical caulking portions protruding in the keyboard spindle axial direction are formed on the peripheral edges of both axial end faces of the keyboard spindle. ing. With this keyboard weight inserted into the key's through hole, the cylindrical caulking portions at both ends in the axial direction can be expanded from both the left and right sides of the key to bite into the inner wall of the key's through hole.
  • the keyboard weight of Patent Document 1 has a configuration in which a notch groove in which the caulking portion is tilted is formed on the opposing surface facing the inner surface of the through hole of the key in order to facilitate expansion of the cylindrical caulking portion.
  • the object of the present invention is to provide a technique for improving the attachment of a keyboard weight to a key.
  • the keyboard weight according to the first aspect of the present invention includes a weight body formed in a columnar shape, and a groove extending along a peripheral edge of the end surface in a peripheral portion of the end surface of the weight main body perpendicular to the axial direction of the weight main body.
  • the outer inner surface of the groove facing the radially inner side of the weight main body toward the opening from the bottom of the groove in the axial direction toward the radially outer side of the weight main body. It inclines and the inclination
  • a key unit includes a key having an insertion hole that opens on a side surface, and a keyboard weight that is inserted into the insertion hole and fixed by caulking to the key.
  • a key unit includes a key having an insertion hole that opens on a side surface, and a columnar keyboard weight that is inserted into the insertion hole and fixed to the key by caulking.
  • a columnar weight body that is inserted into the insertion hole, the weight body having a caulking portion that is formed at a peripheral edge portion of an end portion in an axial direction and that bites into an inner surface of the insertion hole of the key, The caulking portion is formed in a region within ⁇ 45 degrees with respect to the longitudinal direction of the key, and the diameter D of the weight body is 60% or more of the thickness of the key.
  • an annular caulking portion is formed at the peripheral edge portion of the axial end portion of the weight body formed in a columnar shape, and the caulking portion includes three or more caulking portions.
  • a plurality of slits to be divided into the caulking division portions are formed, and the lengths of the caulking division portions in the circumferential direction of the caulking portions are equal to each other among the plurality of caulking division portions.
  • an annular caulking portion is formed at an end portion in the axial direction of a weight body formed in a columnar shape, and the caulking portion includes a plurality of caulking division portions.
  • a plurality of slits are formed, and the width dimension of the slit in the circumferential direction of the caulking portion is 1 mm or more and 3 mm or less.
  • a key unit manufacturing method comprising: a keyboard weight having a groove extending along a peripheral edge of the end surface formed in a peripheral portion of an end surface perpendicular to the axial direction of a columnar weight main body; The caulking portion positioned outside the groove in the radial direction of the keyboard weight is inserted into the insertion hole opened on the side surface of the weight body, and the caulking projection of the caulking tool is inserted into the groove of the weight body.
  • the keyboard weight is fixed to the key by bending outward in the radial direction of the weight and biting into the inner surface of the insertion hole of the key.
  • FIG. 3 is a cross-sectional view showing a state in which the keyboard weight is inserted into the key insertion hole in the operation of inserting and fixing the keyboard weight of FIG. 1 into the key insertion hole. It is sectional drawing which shows the state which crimped and fixed the keyboard weight of FIG. 3 to the key.
  • FIG. 5 is an enlarged sectional view showing the vicinity of a caulking portion of the keyboard weight of FIG. 4. It is a side view which shows the example of the key unit which fixed the keyboard weight of FIG. 1 to the key.
  • FIG. 2 is a diagram showing an example of a key unit in which the keyboard weight of FIG. 1 is fixed to a key, and showing an example of a key unit in which a plurality of caulking divisions of the caulking part of the keyboard weight are all bited into the inner surface of the key insertion hole. It is.
  • the keyboard weight 10 of the embodiment shown in FIGS. 1 and 2 includes a weight body 11 formed in a columnar shape (columnar shape in FIGS. 1 and 2).
  • the keyboard weight 10 is entirely formed of metal such as iron.
  • the material for forming the keyboard weight 10 is not limited to iron, and for example, copper or the like can be used.
  • the keyboard weight 10 is used by being inserted and fixed in the insertion hole 21 formed in the key 20 of the keyboard of the keyboard instrument.
  • the keyboard weight 10 constitutes a key unit 20 ⁇ / b> A together with the key 20 by being fixed to the key 20.
  • end surfaces 12 (hereinafter also referred to as weight body end surfaces 12) orthogonal to the axial direction of the weight body 11 are formed at both ends of the weight body 11 in the axial direction.
  • Grooves 13 extending along the periphery of the weight body end surface 12 are formed in the periphery of the end surface 12 of the weight body 11.
  • the groove 13 is formed in an annular shape along the periphery of the weight main body end surface 12.
  • the outer inner side surface 13 a facing the radially inner side of the weight body 11 is inclined radially outward of the weight body 11 as it goes from the bottom of the groove 13 to the opening in the axial direction of the weight body 11. .
  • the inclination angle ⁇ of the outer inner side surface 13 a of the groove 13 with respect to the axial direction of the weight body 11 is 30 degrees or more with respect to the axial direction of the weight body 11.
  • the inclination angle ⁇ of the outer inner surface 13a of the groove 13 is preferably 30 to 60 degrees.
  • an inner inner surface 13 b facing the outer inner surface 13 a in the width (groove width) direction of the groove 13 is formed perpendicular to the radial direction of the weight body 11.
  • the inclination angle of the inner inner surface 13b with respect to the axial direction of the weight body 11 is 0 degree.
  • a portion 14 located outside the groove 13 in the radial direction of the weight body 11 of the keyboard weight 10 shown in FIGS. 1 and 2 is bitten into the inner surface of the insertion hole 21 of the key 20 as shown in FIGS. It functions as a caulking portion for fixing the keyboard weight 10 to the key 20.
  • a portion 14 located outside the groove 13 in the radial direction of the weight body 11 of the keyboard weight 10 is hereinafter referred to as a caulking portion 14.
  • the caulking portion 14 is formed in an annular shape at the peripheral edge portion of the end portion in the axial direction of the weight main body 11.
  • the caulking portion 14 is formed with a plurality of slits 14b that divide the caulking portion 14 into three or more caulking division portions 14a.
  • the lengths of the caulking division portions 14a in the circumferential direction of the caulking portion 14 are equal to each other.
  • the length of each caulking division portion 14a in the circumferential direction of the caulking portion 14 is not uniform, for example, and may vary.
  • the caulking portion 14 shown in FIGS. 1 and 6 is divided into four caulking division portions 14a that are equal in the circumferential direction by slits 14b formed at four locations in the circumferential direction of the caulking portion 14 (the circumferential direction of the weight body 11). Has been.
  • the width dimension of the slit 14b of the caulking part 14 (the dimension in the circumferential direction of the caulking part 14) is preferably 1 mm or more and 3 mm or less.
  • the insertion hole 21 of the key 20 is formed so as to extend from the side surface of the key 20 to the key 20 in the left-right direction (the vertical direction in FIG. 3 and the direction orthogonal to the paper surface in FIG. 6). Has been.
  • the insertion hole 21 only needs to open on at least one of the side surfaces of the key 20 on both sides in the left-right direction.
  • the insertion hole 21 of the key 20 shown in FIG. 3 is formed so as to penetrate the key 20 in the left-right direction, and is open on both side surfaces of the key 20 in the left-right direction.
  • the keyboard weight 10 uses a cylinder-shaped weight body 11 whose outer diameter matches the inner diameter of the insertion hole 21 of the key 20, or one that is slightly smaller than the inner diameter of the insertion hole 21. .
  • the keyboard weight 10 is inserted into the insertion hole 21 such that the axial direction of the weight body 11 coincides with the depth direction of the insertion hole 21 of the key 20 (the axial direction of the insertion hole 21).
  • the insertion holes 21 of the key 20 shown in FIG. 6 are formed at a plurality of locations in the longitudinal direction of the key 20 (left and right direction in FIG. 6).
  • the keyboard weight 10 is inserted into the key 20 selected from the plurality of insertion holes 21 and fixed to the key 20.
  • the keyboard weight 10 inserted into the insertion hole 21 of the key 20 uses the caulking tool 30 to separate the caulking division portions 14 a of the caulking portions 14 on both sides in the axial direction of the weight body 11.
  • the key body 11 is fixed to the key 20 by bending it outward in the radial direction and biting into the inner surface of the insertion hole 21 of the key 20.
  • the caulking tool 30 is configured such that a caulking projection 32 protrudes from the outer periphery of the tip of a rod-shaped tool body 31.
  • the caulking protrusion 32 is for bending the caulking division portion 14 a of the keyboard weight 10 outward in the radial direction of the weight main body 11.
  • the caulking tool 30 pushes the caulking division portion 14a pressed by the caulking projection 32 by pushing the caulking projection 32 along the outer inner side surface 13a of the caulking division portion 14a into the groove 13 of the keyboard weight 10.
  • the main body 11 is bent outward in the radial direction.
  • the key unit 20A can be manufactured by the following key unit manufacturing method using the caulking tool 30 described above.
  • the keyboard weight 10 is inserted into the insertion hole 21 of the key 20 as shown in FIG.
  • the caulking protrusions 32 of the caulking tool 30 are pushed into the grooves 13 of the keyboard weight 10, and the caulking portions 14 (specifically, the both sides of the weight body 11 of the keyboard weight 10 in the axial direction)
  • the caulking division part 14 a) is bent outward in the radial direction of the weight main body 11 and bites into the inner surface of the insertion hole 21 of the key 20, whereby the keyboard weight 10 is fixed to the key 20.
  • the key unit 20A can be manufactured.
  • the bending of the caulking divided portion 14a to the radially outer side of the weight main body 11 by the caulking projection 32 of the caulking tool 30 is not necessarily uniform in the entire circumferential direction of the caulking portion 14 of the caulking divided portion 14a, and there may be variations. .
  • the deformation of the caulking division portion 14a when the caulking division portion 14a is bent outwardly in the radial direction of the weight main body 11 by the caulking tool 30 does not necessarily proceed evenly and simultaneously over the entire circumferential direction of the caulking portion 14 of the caulking division portion 14a. is not.
  • the width dimension of the slit 14b of the caulking part 14 is 1 mm or more, when the caulking division part 14a is bent outward in the radial direction of the weight body 11 using the caulking tool 30, the caulking division part adjacent to the caulking part 14 via the slit 14b. It is possible to reliably avoid contact between the 14a and bending of the caulking divided portion 14a that is not the object of bending (accompanying bending). Moreover, it is preferable that the width dimension is 3 mm or less at the point which suppresses the process amount by cutting and the slit 14b of the crimping
  • the key weight 10 of the key unit 20A shown in FIG. 6 has the key 20 by biting only the caulking division part 14a formed in an area within ⁇ 45 degrees with respect to the longitudinal direction of the key 20 into the inner surface of the insertion hole 21 of the key 20. 20 is fixed.
  • the caulking division portion 14 a that bites into the inner surface of the insertion hole 21 of the key 20 is located in a region within ⁇ 45 degrees with respect to the longitudinal direction of the key 20 as a whole in the circumferential direction of the caulking portion 14.
  • the caulking division part 14a in which the entire caulking part 14 in the circumferential direction is located within an area within ⁇ 45 degrees with respect to the longitudinal direction of the key 20 is hereinafter also referred to as a key longitudinal direction caulking division part.
  • the key longitudinal caulking divisions are located on both sides with the central axis of the weight body 11.
  • the keyboard weight 10 of the key unit 20A shown in FIG. 6 is such that only two of the four caulking division portions 14a located on both sides of the weight main body 11 through the central axis of the weight body 11 are arranged in the longitudinal direction of the key 20. On the other hand, it is arranged within an area within ⁇ 45 degrees, and the other two are arranged outside the area within ⁇ 45 degrees with respect to the longitudinal direction of the key 20.
  • the key weight 10 of the key unit 20A shown in FIG. 6 has only two caulking division parts 14a (key longitudinal direction caulking division parts) arranged in an area within ⁇ 45 degrees with respect to the longitudinal direction of the key 20 The key is fixed to the key 20 by biting into the inner surface of the insertion hole 21.
  • the two caulking divisions 14 a arranged in an area within ⁇ 45 degrees with respect to the longitudinal direction of the key 20 are made to bite into the inner surface of the insertion hole 21 of the key 20, and the keyboard weight 10 is moved to the key 20.
  • the structure (fixed by caulking) is advantageous in that a slight deformation of the key 20 due to caulking is avoided from affecting the upper surface 22 of the key 20 (hereinafter also referred to as the key upper surface 22).
  • the keyboard weight 10 in which the diameter D (weight outer diameter) of the weight body 11 is 60% or more of the thickness of the key 20 (the vertical dimension in FIG. 6) can be used.
  • the outer inner side surface 13a of the groove 13 formed in the peripheral portion of the end surface 12 of the weight body 11 extends from the bottom of the groove 13 in the axial direction of the weight body 11.
  • the weight body 11 is inclined radially outward as it goes to the opening, and the inclination angle of the outer inner side surface 13a with respect to the axis direction of the weight body 11 is 30 degrees or more.
  • the keyboard weight 10 of this embodiment can suppress the cutting amount at the time of forming from a metal member by cutting, compared with the keyboard weight of FIG. 1 (a), (b) of patent document 1, for example. it can. For this reason, in the keyboard weight 10 of this embodiment, the discard amount of the material at the time of forming by cutting can be reduced, and formation time can be shortened.
  • the key unit 20A of the present embodiment only the portion of the caulking portion 14 of the keyboard weight 10 that is formed within an area within ⁇ 45 degrees with respect to the longitudinal direction of the key 20 is inserted into the key 20. It bites into the inner surface of the hole 21. For this reason, it is possible to easily avoid caulking and fixing the key upper surface 22.
  • the key unit 20A of the present embodiment only the portion of the caulking portion 14 of the keyboard weight 10 that is formed within an area within ⁇ 45 degrees with respect to the longitudinal direction of the key 20 is inserted into the key 20.
  • a keyboard weight 10 is used in which the inner diameter of the weight body 11 is 60% or more of the thickness of the key 20 by biting into the inner surface of the hole 21. For this reason, the adjustment range of the weight adjustment of the key touch by the keyboard weight 10 can be expanded.
  • the plurality of slits 14b that divide the caulking portion 14 into three or more caulking division portions 14a are formed in the annular caulking portion 14 at the axial end portion of the weight main body 11.
  • the lengths of the caulking division portions 14a formed in the circumferential direction of the caulking portion 14 are equal to each other among the plurality of caulking division portions 14a. For this reason, the force for bending the caulking portion outward in the radial direction of the weight main body 11 and biting it into the inner surface of the insertion hole 21 of the key 20 is smaller than that of the annular caulking portion which is not divided and has no slit. The operation of bending the caulking portion outward in the radial direction of the weight body 11 and caulking and fixing the weight body 11 to the key 20 can be easily performed.
  • the width dimension of the slit 14b in the circumferential direction of the annular caulking portion 14 is 1 mm or more and 3 mm or less.
  • the keyboard weight 10 is inserted into the insertion hole 21 of the key 20, and the caulking projection 32 of the caulking tool 30 is simply pushed into the groove 13 of the weight body 11.
  • the caulking portion 14 of the weight main body 11 of the keyboard weight 10 can be bent outward in the radial direction of the weight main body 11 so as to bite into the inner surface of the insertion hole 21 of the key 20. For this reason, it is possible to easily and efficiently fix the keyboard weight 10 to the key 20.
  • the keyboard weight 10 inserted into the insertion hole 21 of the key 20 is configured such that all of the plurality of caulking division portions 14 a of the caulking portions 14 at both ends in the axial direction of the weight body 11 are radially outward of the weight body 11. May be bent into the inner surface of the insertion hole 21 of the key 20 and fixed to the key 20.
  • the code of the key unit is 20B.
  • the groove may not be formed, and the caulking portion may be formed to protrude from the end surface of the weight body.
  • the caulking division portion is not limited to an arc shape when viewed from the axial direction, and may be formed in an arbitrary shape such as a circular shape, a triangular shape, or a fan shape.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Insertion Pins And Rivets (AREA)

Abstract

A keyboard weight includes a pillar like weighted body. A groove is formed extending around the periphery of the end face of the weighted body that is perpendicular to the axial direction of the weighted body. The outward inner surface of the groove that faces toward the inside of the weighted body in the radial direction slopes toward the outside of the weighted body in the radial direction as the outward inner surface extends from the bottom portion of the groove toward an opening in the axial direction. The outward inner surface has an inclination angle of 30° or greater relative to the axial direction.

Description

鍵盤錘、鍵ユニット、鍵ユニットの製造方法Keyboard spindle, key unit, and method of manufacturing key unit
　この発明は、鍵盤楽器に使用される鍵盤錘、鍵ユニット、鍵ユニットの製造方法に関する。 The present invention relates to a keyboard spindle, a key unit, and a key unit manufacturing method used for a keyboard instrument.
　従来から、ピアノ等の鍵盤楽器の鍵盤の各鍵には、演奏時の鍵タッチの重さ調整に用いられる金属製の錘（以下、鍵盤錘、とも言う）が取り付けられている。具体的に、鍵盤錘は、鍵を左右に貫通する貫通孔に挿入、固定される。
　鍵盤錘は、例えば鍵盤の低音側の鍵は重く、高音側の鍵は軽くなるように鍵に取り付けられ、これにより演奏時のタッチ感が向上する。 Conventionally, a metal weight (hereinafter also referred to as a keyboard weight) used to adjust the weight of a key touch during performance is attached to each key of a keyboard instrument such as a piano. Specifically, the keyboard weight is inserted and fixed in a through hole penetrating the key from side to side.
The keyboard weight is attached to the key so that, for example, the lower key of the keyboard is heavier and the higher key is lighter, thereby improving the touch feeling during performance.
　鍵盤錘には、円柱状に形成された鉛製のものが広く用いられている。しかしながら、健康や環境への影響の観点から、鍵盤錘を鉛以外の金属材料によって形成することが検討されている。鍵盤錘は、例えば鉄等のように、鉛に比べて硬質の金属によって形成することが考えられている。
　例えば、特許文献１の図１（ａ）、（ｂ）には、鍵盤錘の軸方向両端面のそれぞれの周縁に、鍵盤錘軸方向に突出する円筒状のかしめ部を形成した構成が開示されている。この鍵盤錘は、鍵の貫通孔に挿入した状態で、鍵の左右両側から棒状の固定具を用いて、軸方向両端の円筒状のかしめ部を拡張させ、鍵の貫通孔内壁に食い込ませることで、鍵に固定される。また、特許文献１の鍵盤錘は、円筒状のかしめ部の拡張を容易にするために、鍵の貫通孔内面に対向する対向面にかしめ部が倒れ込む切欠溝を形成した構成となっている。 As the keyboard weight, a lead made in a columnar shape is widely used. However, from the viewpoint of health and environmental impact, it has been studied to form the keyboard weight with a metal material other than lead. It is considered that the keyboard weight is made of a metal that is harder than lead, such as iron.
For example, FIGS. 1A and 1B of Patent Document 1 disclose a configuration in which cylindrical caulking portions protruding in the keyboard spindle axial direction are formed on the peripheral edges of both axial end faces of the keyboard spindle. ing. With this keyboard weight inserted into the key's through hole, the cylindrical caulking portions at both ends in the axial direction can be expanded from both the left and right sides of the key to bite into the inner wall of the key's through hole. It is fixed to the key. In addition, the keyboard weight of Patent Document 1 has a configuration in which a notch groove in which the caulking portion is tilted is formed on the opposing surface facing the inner surface of the through hole of the key in order to facilitate expansion of the cylindrical caulking portion.
特開２００３－１７７７４０号公報JP 2003-177740 A
　本発明は、鍵への鍵盤錘の取り付けを良好にする技術を提供することを目的とする。 The object of the present invention is to provide a technique for improving the attachment of a keyboard weight to a key.
　上記課題を解決するために、本発明では以下の態様を提供する。
本発明の第一の態様の鍵盤錘は、柱状に形成された錘本体を備え、前記錘本体の軸方向に直交する前記錘本体の端面の周縁部分に、前記端面の周縁に沿って延びる溝が形成され、前記溝の内面のうち前記錘本体の径方向内側に向く前記溝の外側内側面が、前記軸方向において前記溝の底部から開口に向かうにしたがって、前記錘本体の径方向外側に傾斜し、前記軸方向に対する前記外側内側面の傾斜角度が、３０度以上である。 In order to solve the above problems, the present invention provides the following aspects.
The keyboard weight according to the first aspect of the present invention includes a weight body formed in a columnar shape, and a groove extending along a peripheral edge of the end surface in a peripheral portion of the end surface of the weight main body perpendicular to the axial direction of the weight main body. Of the inner surface of the groove, the outer inner surface of the groove facing the radially inner side of the weight main body toward the opening from the bottom of the groove in the axial direction toward the radially outer side of the weight main body. It inclines and the inclination | tilt angle of the said outer side surface with respect to the said axial direction is 30 degree | times or more.
　本発明の第二の態様の鍵ユニットは、側面に開口する挿入孔を有する鍵と、前記挿入孔に挿入されて前記鍵にかしめ固定された鍵盤錘と、を備え、前記鍵盤錘は、前記挿入孔に挿入される柱状の錘本体を有し、前記錘本体は軸方向の端部の周縁部分に形成され前記鍵の前記挿入孔の内面に食い込ませたかしめ部を有し、前記かしめ部は、前記鍵の長手方向に対して、±４５度以内の領域に形成されている。 A key unit according to a second aspect of the present invention includes a key having an insertion hole that opens on a side surface, and a keyboard weight that is inserted into the insertion hole and fixed by caulking to the key. A columnar weight main body inserted into the insertion hole, the weight main body having a caulking portion formed at a peripheral edge portion of an end portion in an axial direction and biting into an inner surface of the insertion hole of the key; Is formed in a region within ± 45 degrees with respect to the longitudinal direction of the key.
　本発明の第三の態様の鍵ユニットは、側面に開口する挿入孔を有する鍵と、前記挿入孔に挿入されて前記鍵にかしめ固定された柱状の鍵盤錘と、を備え、前記鍵盤錘は、前記挿入孔に挿入される柱状の錘本体を有し、前記錘本体は軸方向の端部の周縁部分に形成され前記鍵の前記挿入孔の内面に食い込ませたかしめ部を有し、前記かしめ部は、前記鍵の長手方向に対して、±４５度以内の領域に形成され、前記錘本体の直径Ｄは、前記鍵の厚みの６０％以上である。 A key unit according to a third aspect of the present invention includes a key having an insertion hole that opens on a side surface, and a columnar keyboard weight that is inserted into the insertion hole and fixed to the key by caulking. A columnar weight body that is inserted into the insertion hole, the weight body having a caulking portion that is formed at a peripheral edge portion of an end portion in an axial direction and that bites into an inner surface of the insertion hole of the key, The caulking portion is formed in a region within ± 45 degrees with respect to the longitudinal direction of the key, and the diameter D of the weight body is 60% or more of the thickness of the key.
　本発明の第四の態様の鍵盤錘は、柱状に形成された錘本体の軸方向の端部の周縁部分に環状のかしめ部が形成され、前記かしめ部には、当該かしめ部を三つ以上のかしめ分割部に分割する複数のスリットが形成され、前記かしめ部の周方向における前記かしめ分割部の長さが、複数の前記かしめ分割部の間で互いに等しい。 In the keyboard weight according to the fourth aspect of the present invention, an annular caulking portion is formed at the peripheral edge portion of the axial end portion of the weight body formed in a columnar shape, and the caulking portion includes three or more caulking portions. A plurality of slits to be divided into the caulking division portions are formed, and the lengths of the caulking division portions in the circumferential direction of the caulking portions are equal to each other among the plurality of caulking division portions.
　本発明の第五の態様の鍵盤錘は、柱状に形成された錘本体の軸方向の端部に、環状のかしめ部が形成され、前記かしめ部には、当該かしめ部を複数のかしめ分割部に分割する複数のスリットが形成され、前記かしめ部の周方向における前記スリットの幅寸法が、１ｍｍ以上、３ｍｍ以下である。 In the keyboard weight of the fifth aspect of the present invention, an annular caulking portion is formed at an end portion in the axial direction of a weight body formed in a columnar shape, and the caulking portion includes a plurality of caulking division portions. A plurality of slits are formed, and the width dimension of the slit in the circumferential direction of the caulking portion is 1 mm or more and 3 mm or less.
　本発明の第六態様の鍵ユニットの製造方法は、柱状に形成された錘本体の軸方向に直交する端面の周縁部分に前記端面の周縁に沿って延びる溝が形成された鍵盤錘を、鍵の側面に開口する挿入孔に挿入し、前記錘本体の前記溝にかしめ用工具のかしめ用突起を挿入することによって、前記鍵盤錘の径方向において前記溝の外側に位置するかしめ部を前記鍵盤錘の径方向外側へ曲げて前記鍵の前記挿入孔の内面に食い込ませることで前記鍵盤錘を前記鍵に固定する。 According to a sixth aspect of the present invention, there is provided a key unit manufacturing method comprising: a keyboard weight having a groove extending along a peripheral edge of the end surface formed in a peripheral portion of an end surface perpendicular to the axial direction of a columnar weight main body; The caulking portion positioned outside the groove in the radial direction of the keyboard weight is inserted into the insertion hole opened on the side surface of the weight body, and the caulking projection of the caulking tool is inserted into the groove of the weight body. The keyboard weight is fixed to the key by bending outward in the radial direction of the weight and biting into the inner surface of the insertion hole of the key.
　本発明の態様によれば、鍵への鍵盤錘の取り付けを良好にすることができる。 According to the aspect of the present invention, it is possible to improve the attachment of the keyboard weight to the key.
本発明の一実施形態に係る鍵盤錘を示す斜視図である。It is a perspective view which shows the keyboard weight which concerns on one Embodiment of this invention. 図１の鍵盤錘の断面図である。It is sectional drawing of the keyboard weight of FIG. 図１の鍵盤錘を鍵の挿入孔に挿入固定する作業において、鍵盤錘を鍵の挿入孔に挿入した状態を示す断面図である。FIG. 3 is a cross-sectional view showing a state in which the keyboard weight is inserted into the key insertion hole in the operation of inserting and fixing the keyboard weight of FIG. 1 into the key insertion hole. 図３の鍵盤錘を鍵にかしめ固定した状態を示す断面図である。It is sectional drawing which shows the state which crimped and fixed the keyboard weight of FIG. 3 to the key. 図４の鍵盤錘のかしめ部付近を示す拡大断面図である。FIG. 5 is an enlarged sectional view showing the vicinity of a caulking portion of the keyboard weight of FIG. 4. 図１の鍵盤錘を鍵に固定した鍵ユニットの例を示す側面図である。It is a side view which shows the example of the key unit which fixed the keyboard weight of FIG. 1 to the key. 図１の鍵盤錘を鍵に固定した鍵ユニットの例を示す図であって、鍵盤錘のかしめ部の複数のかしめ分割部を全て鍵の挿入孔内面に食い込ませた鍵ユニットの例を示す図である。FIG. 2 is a diagram showing an example of a key unit in which the keyboard weight of FIG. 1 is fixed to a key, and showing an example of a key unit in which a plurality of caulking divisions of the caulking part of the keyboard weight are all bited into the inner surface of the key insertion hole. It is.
　以下、本発明の一実施形態について図面を参照して説明する。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
　図１、図２に示す実施形態の鍵盤錘１０は、柱状（図１、図２では円柱状）に形成された錘本体１１を備えている。鍵盤錘１０は、その全体が、例えば鉄等の金属によって形成されている。鍵盤錘１０の形成材料は、鉄に限定されず、例えば銅等も採用可能である。 The keyboard weight 10 of the embodiment shown in FIGS. 1 and 2 includes a weight body 11 formed in a columnar shape (columnar shape in FIGS. 1 and 2). The keyboard weight 10 is entirely formed of metal such as iron. The material for forming the keyboard weight 10 is not limited to iron, and for example, copper or the like can be used.
　図４～図６に示すように、鍵盤錘１０は、鍵盤楽器の鍵盤の鍵２０に形成された挿入孔２１に挿入固定して使用される。鍵盤錘１０は、鍵２０に固定されることで鍵２０と共に鍵ユニット２０Ａを構成する。 As shown in FIGS. 4 to 6, the keyboard weight 10 is used by being inserted and fixed in the insertion hole 21 formed in the key 20 of the keyboard of the keyboard instrument. The keyboard weight 10 constitutes a key unit 20 </ b> A together with the key 20 by being fixed to the key 20.
　図１、図２に示すように、錘本体１１の軸方向両端には、錘本体１１の軸方向に直交する端面１２（以下、錘本体端面１２、とも言う）が形成されている。
　錘本体１１の端面１２の周縁部分には、錘本体端面１２の周縁に沿って延びる溝１３が形成されている。溝１３は、錘本体端面１２の周縁に沿う環状に形成されている。 As shown in FIGS. 1 and 2, end surfaces 12 (hereinafter also referred to as weight body end surfaces 12) orthogonal to the axial direction of the weight body 11 are formed at both ends of the weight body 11 in the axial direction.
Grooves 13 extending along the periphery of the weight body end surface 12 are formed in the periphery of the end surface 12 of the weight body 11. The groove 13 is formed in an annular shape along the periphery of the weight main body end surface 12.
　溝１３の内面のうち錘本体１１の径方向内側に向く外側内側面１３ａは、錘本体１１の軸方向において溝１３の底部から開口に向かうにしたがって錘本体１１の径方向外側に傾斜している。
　錘本体１１の軸方向に対する溝１３の外側内側面１３ａの傾斜角度θは、錘本体１１の軸方向に対して３０度以上となっている。溝１３の外側内側面１３ａの傾斜角度θは３０～６０度が好ましい。 Of the inner surface of the groove 13, the outer inner side surface 13 a facing the radially inner side of the weight body 11 is inclined radially outward of the weight body 11 as it goes from the bottom of the groove 13 to the opening in the axial direction of the weight body 11. .
The inclination angle θ of the outer inner side surface 13 a of the groove 13 with respect to the axial direction of the weight body 11 is 30 degrees or more with respect to the axial direction of the weight body 11. The inclination angle θ of the outer inner surface 13a of the groove 13 is preferably 30 to 60 degrees.
　図１，図２に示す鍵盤錘１０において、溝１３の幅（溝幅）方向において外側内側面１３ａに対面する内側内側面１３ｂは、錘本体１１の径方向に垂直に形成されている。内側内側面１３ｂの錘本体１１の軸方向に対する傾斜角度は０度である。 In the keyboard weight 10 shown in FIGS. 1 and 2, an inner inner surface 13 b facing the outer inner surface 13 a in the width (groove width) direction of the groove 13 is formed perpendicular to the radial direction of the weight body 11. The inclination angle of the inner inner surface 13b with respect to the axial direction of the weight body 11 is 0 degree.
　図１、図２に示す鍵盤錘１０の錘本体１１の径方向において溝１３の外側に位置する部分１４は、図４、図５に示すように、鍵２０の挿入孔２１内面に食い込ませて鍵盤錘１０を鍵２０に固定するためのかしめ部として機能する。
　鍵盤錘１０の錘本体１１の径方向における溝１３の外側に位置する部分１４を、以下、かしめ部１４、と言う。 A portion 14 located outside the groove 13 in the radial direction of the weight body 11 of the keyboard weight 10 shown in FIGS. 1 and 2 is bitten into the inner surface of the insertion hole 21 of the key 20 as shown in FIGS. It functions as a caulking portion for fixing the keyboard weight 10 to the key 20.
A portion 14 located outside the groove 13 in the radial direction of the weight body 11 of the keyboard weight 10 is hereinafter referred to as a caulking portion 14.
　かしめ部１４は、錘本体１１の軸方向端部の周縁部分に環状に形成されている。
　かしめ部１４には、当該かしめ部１４を三つ以上のかしめ分割部１４ａに分割する複数のスリット１４ｂが形成されている。本実施形態において、かしめ部１４の周方向における各かしめ分割部１４ａの長さは互いに等しい。かしめ部１４の周方向における各かしめ分割部１４ａの長さは、例えば一様でなく、ばらつきがあってもよい。
　図１、図６に示すかしめ部１４は、かしめ部１４の周方向（錘本体１１の周方向）の４箇所に形成されたスリット１４ｂによって、周方向に均等の４つのかしめ分割部１４ａに分割されている。 The caulking portion 14 is formed in an annular shape at the peripheral edge portion of the end portion in the axial direction of the weight main body 11.
The caulking portion 14 is formed with a plurality of slits 14b that divide the caulking portion 14 into three or more caulking division portions 14a. In the present embodiment, the lengths of the caulking division portions 14a in the circumferential direction of the caulking portion 14 are equal to each other. The length of each caulking division portion 14a in the circumferential direction of the caulking portion 14 is not uniform, for example, and may vary.
The caulking portion 14 shown in FIGS. 1 and 6 is divided into four caulking division portions 14a that are equal in the circumferential direction by slits 14b formed at four locations in the circumferential direction of the caulking portion 14 (the circumferential direction of the weight body 11). Has been.
　かしめ部１４のスリット１４ｂの幅寸法（かしめ部１４の周方向における寸法）は、１ｍｍ以上、３ｍｍ以下であることが好ましい。 The width dimension of the slit 14b of the caulking part 14 (the dimension in the circumferential direction of the caulking part 14) is preferably 1 mm or more and 3 mm or less.
　図３、図６に示すように、鍵２０の挿入孔２１は、鍵２０の側面から鍵２０にその左右方向（図３において上下方向、図６において紙面に直交する方向）に延びるように形成されている。
　挿入孔２１は、鍵２０の左右方向両側の側面の少なくとも片方に開口していればよい。図３に示す鍵２０の挿入孔２１は、鍵２０にその左右方向に貫通して形成され、鍵２０の左右方向両側の側面に開口している。 As shown in FIGS. 3 and 6, the insertion hole 21 of the key 20 is formed so as to extend from the side surface of the key 20 to the key 20 in the left-right direction (the vertical direction in FIG. 3 and the direction orthogonal to the paper surface in FIG. 6). Has been.
The insertion hole 21 only needs to open on at least one of the side surfaces of the key 20 on both sides in the left-right direction. The insertion hole 21 of the key 20 shown in FIG. 3 is formed so as to penetrate the key 20 in the left-right direction, and is open on both side surfaces of the key 20 in the left-right direction.
　図３に示すように、鍵盤錘１０は、円柱状の錘本体１１の外径が鍵２０の挿入孔２１内径に一致するもの、又は、挿入孔２１の内径よりも微小に小さいものを使用する。
　鍵盤錘１０は、錘本体１１の軸方向が鍵２０の挿入孔２１の深さ方向（挿入孔２１の軸方向）に一致するようにして挿入孔２１に挿入される。 As shown in FIG. 3, the keyboard weight 10 uses a cylinder-shaped weight body 11 whose outer diameter matches the inner diameter of the insertion hole 21 of the key 20, or one that is slightly smaller than the inner diameter of the insertion hole 21. .
The keyboard weight 10 is inserted into the insertion hole 21 such that the axial direction of the weight body 11 coincides with the depth direction of the insertion hole 21 of the key 20 (the axial direction of the insertion hole 21).
　図６に示す鍵２０の挿入孔２１は、鍵２０の長手方向（図６において左右方向）の複数箇所に形成されている。
　鍵盤錘１０は、鍵２０の複数の挿入孔２１から選択したものに挿入して鍵２０に固定される。 The insertion holes 21 of the key 20 shown in FIG. 6 are formed at a plurality of locations in the longitudinal direction of the key 20 (left and right direction in FIG. 6).
The keyboard weight 10 is inserted into the key 20 selected from the plurality of insertion holes 21 and fixed to the key 20.
　図３、図４に示すように、鍵２０の挿入孔２１に挿入された鍵盤錘１０は、錘本体１１の軸方向両側のかしめ部１４のかしめ分割部１４ａを、かしめ用工具３０を用いて錘本体１１の径方向外側へ曲げて鍵２０の挿入孔２１内面に食い込ませることで鍵２０に固定される。
　かしめ用工具３０は、棒状の工具本体３１の先端外周部に、かしめ用突起３２を突出させて構成されている。かしめ用突起３２は、鍵盤錘１０のかしめ分割部１４ａを錘本体１１の径方向外側へ曲げるためのものである。
　かしめ用工具３０は、かしめ用突起３２をかしめ分割部１４ａの外側内側面１３ａに沿わせて鍵盤錘１０の溝１３に押し込んでいくことで、かしめ用突起３２によって押圧したかしめ分割部１４ａを錘本体１１の径方向外側へ曲げるものである。 As shown in FIGS. 3 and 4, the keyboard weight 10 inserted into the insertion hole 21 of the key 20 uses the caulking tool 30 to separate the caulking division portions 14 a of the caulking portions 14 on both sides in the axial direction of the weight body 11. The key body 11 is fixed to the key 20 by bending it outward in the radial direction and biting into the inner surface of the insertion hole 21 of the key 20.
The caulking tool 30 is configured such that a caulking projection 32 protrudes from the outer periphery of the tip of a rod-shaped tool body 31. The caulking protrusion 32 is for bending the caulking division portion 14 a of the keyboard weight 10 outward in the radial direction of the weight main body 11.
The caulking tool 30 pushes the caulking division portion 14a pressed by the caulking projection 32 by pushing the caulking projection 32 along the outer inner side surface 13a of the caulking division portion 14a into the groove 13 of the keyboard weight 10. The main body 11 is bent outward in the radial direction.
鍵ユニット２０Ａは、上記のかしめ用工具３０を用いて、以下の鍵ユニットの製造方法によって製造できる。
鍵ユニット２０Ａを製造する際には、はじめに図３に示すように、鍵盤錘１０を鍵２０の挿入孔２１に挿入する。次いで図４、図５に示すように、かしめ用工具３０のかしめ用突起３２を鍵盤錘１０の溝１３に押し込んで鍵盤錘１０の錘本体１１の軸方向両側のかしめ部１４（具体的にはかしめ分割部１４ａ）を錘本体１１の径方向外側へ曲げて鍵２０の挿入孔２１内面に食い込ませ、これにより鍵盤錘１０を鍵２０に固定する。以上により、鍵ユニット２０Ａを製造できる。 The key unit 20A can be manufactured by the following key unit manufacturing method using the caulking tool 30 described above.
When manufacturing the key unit 20A, first, the keyboard weight 10 is inserted into the insertion hole 21 of the key 20 as shown in FIG. Next, as shown in FIGS. 4 and 5, the caulking protrusions 32 of the caulking tool 30 are pushed into the grooves 13 of the keyboard weight 10, and the caulking portions 14 (specifically, the both sides of the weight body 11 of the keyboard weight 10 in the axial direction) The caulking division part 14 a) is bent outward in the radial direction of the weight main body 11 and bites into the inner surface of the insertion hole 21 of the key 20, whereby the keyboard weight 10 is fixed to the key 20. As described above, the key unit 20A can be manufactured.
　かしめ用工具３０のかしめ用突起３２によるかしめ分割部１４ａの錘本体１１の径方向外側への曲げは、かしめ分割部１４ａのかしめ部１４の周方向全体で必ずしも均等ではなく、バラツキが存在し得る。かしめ分割部１４ａをかしめ用工具３０によって錘本体１１の径方向外側へ曲げる際のかしめ分割部１４ａの変形は、必ずしも、かしめ分割部１４ａのかしめ部１４の周方向全体にわたって均等かつ同時に進行するものではない。
　かしめ部１４のスリット１４ｂの幅寸法が１ｍｍ以上であれば、かしめ分割部１４ａをかしめ用工具３０を用いて錘本体１１の径方向外側へ曲げる際に、スリット１４ｂを介して隣り合うかしめ分割部１４ａ同士の当接や、それによる曲げ対象外のかしめ分割部１４ａの曲げ（連れ曲げ）、を確実に回避できる。
　また、かしめ部１４のスリット１４ｂは、切削加工による加工量を抑え、容易に形成する点で、幅寸法が３ｍｍ以下であることが好ましい。 The bending of the caulking divided portion 14a to the radially outer side of the weight main body 11 by the caulking projection 32 of the caulking tool 30 is not necessarily uniform in the entire circumferential direction of the caulking portion 14 of the caulking divided portion 14a, and there may be variations. . The deformation of the caulking division portion 14a when the caulking division portion 14a is bent outwardly in the radial direction of the weight main body 11 by the caulking tool 30 does not necessarily proceed evenly and simultaneously over the entire circumferential direction of the caulking portion 14 of the caulking division portion 14a. is not.
If the width dimension of the slit 14b of the caulking part 14 is 1 mm or more, when the caulking division part 14a is bent outward in the radial direction of the weight body 11 using the caulking tool 30, the caulking division part adjacent to the caulking part 14 via the slit 14b. It is possible to reliably avoid contact between the 14a and bending of the caulking divided portion 14a that is not the object of bending (accompanying bending).
Moreover, it is preferable that the width dimension is 3 mm or less at the point which suppresses the process amount by cutting and the slit 14b of the crimping | crimped part 14 forms easily.
　図６に示す鍵ユニット２０Ａの鍵盤錘１０は、鍵２０の長手方向に対して±４５度以内の領域に形成されているかしめ分割部１４ａのみを鍵２０の挿入孔２１内面に食い込ませて鍵２０に固定されている。鍵２０の挿入孔２１の内面に食い込ませたかしめ分割部１４ａは、かしめ部１４の周方向における全体が鍵２０の長手方向に対して±４５度以内の領域内に位置するものである。
　かしめ部１４の周方向における全体が鍵２０の長手方向に対して±４５度以内の領域内に位置するかしめ分割部１４ａを、以下、鍵長手方向かしめ分割部、とも言う。
　鍵盤錘１０において、鍵長手方向かしめ分割部は錘本体１１の中心軸線を介して両側に位置している。 The key weight 10 of the key unit 20A shown in FIG. 6 has the key 20 by biting only the caulking division part 14a formed in an area within ± 45 degrees with respect to the longitudinal direction of the key 20 into the inner surface of the insertion hole 21 of the key 20. 20 is fixed. The caulking division portion 14 a that bites into the inner surface of the insertion hole 21 of the key 20 is located in a region within ± 45 degrees with respect to the longitudinal direction of the key 20 as a whole in the circumferential direction of the caulking portion 14.
The caulking division part 14a in which the entire caulking part 14 in the circumferential direction is located within an area within ± 45 degrees with respect to the longitudinal direction of the key 20 is hereinafter also referred to as a key longitudinal direction caulking division part.
In the keyboard weight 10, the key longitudinal caulking divisions are located on both sides with the central axis of the weight body 11.
　図６に示す鍵ユニット２０Ａの鍵盤錘１０は、具体的には、４つのかしめ分割部１４ａのうち、錘本体１１の中心軸線を介して両側に位置する２つのみを鍵２０の長手方向に対して±４５度以内の領域内に配置し、他の２つを鍵２０の長手方向に対して±４５度以内の領域外に配置している。図６に示す鍵ユニット２０Ａの鍵盤錘１０は、鍵２０の長手方向に対して±４５度以内の領域内に配置した２つのかしめ分割部１４ａ（鍵長手方向かしめ分割部）のみを鍵２０の挿入孔２１内面に食い込ませて鍵２０に固定されている。 Specifically, the keyboard weight 10 of the key unit 20A shown in FIG. 6 is such that only two of the four caulking division portions 14a located on both sides of the weight main body 11 through the central axis of the weight body 11 are arranged in the longitudinal direction of the key 20. On the other hand, it is arranged within an area within ± 45 degrees, and the other two are arranged outside the area within ± 45 degrees with respect to the longitudinal direction of the key 20. The key weight 10 of the key unit 20A shown in FIG. 6 has only two caulking division parts 14a (key longitudinal direction caulking division parts) arranged in an area within ± 45 degrees with respect to the longitudinal direction of the key 20 The key is fixed to the key 20 by biting into the inner surface of the insertion hole 21.
　図６に示すように、鍵２０の長手方向に対して±４５度以内の領域内に配置した２つのかしめ分割部１４ａのみを鍵２０の挿入孔２１内面に食い込ませて鍵盤錘１０を鍵２０に固定（かしめ固定）した構成は、かしめ固定による鍵２０の微小な変形が鍵２０の上面２２（以下、鍵上面２２、とも言う）に影響を与えることを回避する点で有利である。 As shown in FIG. 6, only the two caulking divisions 14 a arranged in an area within ± 45 degrees with respect to the longitudinal direction of the key 20 are made to bite into the inner surface of the insertion hole 21 of the key 20, and the keyboard weight 10 is moved to the key 20. The structure (fixed by caulking) is advantageous in that a slight deformation of the key 20 due to caulking is avoided from affecting the upper surface 22 of the key 20 (hereinafter also referred to as the key upper surface 22).
　従来は、鍵盤錘のかしめ固定による鍵の微小変形が鍵上面に影響を与えることを回避するため、鍵盤錘は直径が鍵の厚みの６０％に満たないものを使用することが一般的であった。
　これに対して、錘本体１１の中心軸線を介して両側の鍵長手方向かしめ分割部のみを鍵２０の挿入孔２１内面に食い込ませて鍵盤錘１０を鍵２０に固定した構成では、従来に比べて直径が大きい錘本体を有する鍵盤錘１０を使用しても、鍵盤錘１０のかしめ固定が鍵上面２２に影響を与えることを回避できる。
　このため、図６に示すように、錘本体１１の中心軸線を介して両側の鍵長手方向かしめ分割部のみを鍵２０の挿入孔２１内面に食い込ませて鍵盤錘１０を鍵２０に固定した鍵ユニット２０Ａでは、錘本体１１の直径Ｄ（錘本体外径）が鍵２０の厚み（図６上下方向寸法）の６０％以上である鍵盤錘１０を使用できる。 Conventionally, in order to avoid that the key deformation due to the caulking and fixing of the keyboard weight affects the upper surface of the key, it is common to use a keyboard weight whose diameter is less than 60% of the key thickness. It was.
On the other hand, in the configuration in which only the key longitudinal direction caulking divisions on both sides are bitten into the inner surface of the insertion hole 21 of the key 20 via the central axis of the weight body 11, and the keyboard weight 10 is fixed to the key 20, compared to the conventional case. Even when the keyboard weight 10 having a weight body having a large diameter is used, it is possible to avoid the caulking and fixing of the keyboard weight 10 from affecting the key upper surface 22.
For this reason, as shown in FIG. 6, the key in which the keyboard weight 10 is fixed to the key 20 by causing only the key longitudinal direction caulking divisions on both sides to bite into the inner surface of the insertion hole 21 of the key 20 through the central axis of the weight body 11. In the unit 20A, the keyboard weight 10 in which the diameter D (weight outer diameter) of the weight body 11 is 60% or more of the thickness of the key 20 (the vertical dimension in FIG. 6) can be used.
　以上説明したように、本実施形態の鍵盤錘１０によれば、錘本体１１の端面１２の周縁部分に形成された溝１３の外側内側面１３ａが、錘本体１１軸方向において溝１３の底部から開口に向かうにしたがって錘本体１１の径方向外側に傾斜し、錘本体１１軸方向に対する外側内側面１３ａの傾斜角度が３０度以上である。このため、外側内側面１３ａに錘本体１１の軸方向への押圧力を作用させるだけで錘本体１１の溝１３外側に位置する部分（かしめ部１４）を錘本体１１径方向外側へ曲げて鍵２０の挿入孔２１内面に食い込ませ、鍵２０に固定（かしめ固定）できる。
　また、本実施形態の鍵盤錘１０は、特許文献１の図１（ａ）、（ｂ）の鍵盤錘に比べて、例えば、金属部材から切削加工によって形成する際の切削量を少なく抑えることができる。このため、本実施形態の鍵盤錘１０では、切削加工によって形成する際の材料の廃棄量を削減し、形成時間を短縮することができる。 As described above, according to the keyboard weight 10 of the present embodiment, the outer inner side surface 13a of the groove 13 formed in the peripheral portion of the end surface 12 of the weight body 11 extends from the bottom of the groove 13 in the axial direction of the weight body 11. The weight body 11 is inclined radially outward as it goes to the opening, and the inclination angle of the outer inner side surface 13a with respect to the axis direction of the weight body 11 is 30 degrees or more. For this reason, only by applying a pressing force in the axial direction of the weight main body 11 to the outer inner side surface 13a, a portion (caulking portion 14) located outside the groove 13 of the weight main body 11 is bent outward in the radial direction of the weight main body 11 20 can be bitten into the inner surface of the insertion hole 21 and fixed to the key 20 (caulking).
Moreover, the keyboard weight 10 of this embodiment can suppress the cutting amount at the time of forming from a metal member by cutting, compared with the keyboard weight of FIG. 1 (a), (b) of patent document 1, for example. it can. For this reason, in the keyboard weight 10 of this embodiment, the discard amount of the material at the time of forming by cutting can be reduced, and formation time can be shortened.
　また、本実施形態の鍵ユニット２０Ａによれば、鍵盤錘１０のかしめ部１４のうち、鍵２０の長手方向に対して±４５度以内の領域内に形成されている部分のみを鍵２０の挿入孔２１内面に食い込ませている。このため、鍵上面２２にかしめ固定の影響を与えることを容易に回避できる。 Further, according to the key unit 20A of the present embodiment, only the portion of the caulking portion 14 of the keyboard weight 10 that is formed within an area within ± 45 degrees with respect to the longitudinal direction of the key 20 is inserted into the key 20. It bites into the inner surface of the hole 21. For this reason, it is possible to easily avoid caulking and fixing the key upper surface 22.
　また、本実施形態の鍵ユニット２０Ａによれば、鍵盤錘１０のかしめ部１４のうち、鍵２０の長手方向に対して±４５度以内の領域内に形成されている部分のみを鍵２０の挿入孔２１内面に食い込ませ、錘本体１１の直径が鍵２０の厚みの６０％以上である鍵盤錘１０を採用している。このため、鍵盤錘１０による鍵タッチの重さ調整の調整幅を拡大できる。 Further, according to the key unit 20A of the present embodiment, only the portion of the caulking portion 14 of the keyboard weight 10 that is formed within an area within ± 45 degrees with respect to the longitudinal direction of the key 20 is inserted into the key 20. A keyboard weight 10 is used in which the inner diameter of the weight body 11 is 60% or more of the thickness of the key 20 by biting into the inner surface of the hole 21. For this reason, the adjustment range of the weight adjustment of the key touch by the keyboard weight 10 can be expanded.
　また、本実施形態の鍵盤錘１０によれば、錘本体１１の軸方向端部の環状のかしめ部１４に、当該かしめ部１４を三つ以上のかしめ分割部１４ａに分割する複数のスリット１４ｂが形成され、かしめ部１４の周方向におけるかしめ分割部１４ａの長さが、複数のかしめ分割部１４ａの間で互いに等しくなっている。このため、スリットが無く、分割されていない環状のままのかしめ部に比べて、かしめ部を錘本体１１径方向外側へ曲げて鍵２０の挿入孔２１内面に食い込ませるための力が小さくて済み、かしめ部を錘本体１１径方向外側へ曲げて錘本体１１を鍵２０にかしめ固定する作業を楽に行える。 In addition, according to the keyboard weight 10 of the present embodiment, the plurality of slits 14b that divide the caulking portion 14 into three or more caulking division portions 14a are formed in the annular caulking portion 14 at the axial end portion of the weight main body 11. The lengths of the caulking division portions 14a formed in the circumferential direction of the caulking portion 14 are equal to each other among the plurality of caulking division portions 14a. For this reason, the force for bending the caulking portion outward in the radial direction of the weight main body 11 and biting it into the inner surface of the insertion hole 21 of the key 20 is smaller than that of the annular caulking portion which is not divided and has no slit. The operation of bending the caulking portion outward in the radial direction of the weight body 11 and caulking and fixing the weight body 11 to the key 20 can be easily performed.
　また、本実施形態の鍵盤錘１０によれば、環状のかしめ部１４の周方向におけるスリット１４ｂの幅寸法が、１ｍｍ以上、３ｍｍ以下である。これにより、かしめ分割部１４ａを錘本体１１径方向外側へ曲げる際に、曲げ対象外のかしめ分割部１４ａの曲げ（連れ曲げ）、を確実に回避できる。また、この鍵盤錘１０によれば、スリット１４ｂを形成するための切削加工を少なく抑えることができる。 Further, according to the keyboard weight 10 of the present embodiment, the width dimension of the slit 14b in the circumferential direction of the annular caulking portion 14 is 1 mm or more and 3 mm or less. Thereby, when the caulking division part 14a is bent outward in the radial direction of the weight body 11, it is possible to reliably avoid the bending (combination bending) of the caulking division part 14a that is not the object of bending. Moreover, according to this keyboard weight 10, the cutting process for forming the slit 14b can be suppressed little.
　また、本実施形態の鍵ユニットの製造方法によれば、鍵盤錘１０を鍵２０の挿入孔２１に挿入し、かしめ用工具３０のかしめ用突起３２を錘本体１１の溝１３に押し込むだけで、鍵盤錘１０の錘本体１１のかしめ部１４を錘本体１１の径方向外側へ曲げて鍵２０の挿入孔２１内面に食い込ませることができる。このため、鍵盤錘１０の鍵２０への固定を簡単に効率良く行なうことができる。 Further, according to the key unit manufacturing method of the present embodiment, the keyboard weight 10 is inserted into the insertion hole 21 of the key 20, and the caulking projection 32 of the caulking tool 30 is simply pushed into the groove 13 of the weight body 11. The caulking portion 14 of the weight main body 11 of the keyboard weight 10 can be bent outward in the radial direction of the weight main body 11 so as to bite into the inner surface of the insertion hole 21 of the key 20. For this reason, it is possible to easily and efficiently fix the keyboard weight 10 to the key 20.
　以上、本発明について詳細に説明したが、本発明は上記実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。 As mentioned above, although this invention was demonstrated in detail, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
　例えば、図７に示すように、鍵２０の挿入孔２１に挿入した鍵盤錘１０は、錘本体１１軸方向両端部のかしめ部１４の複数のかしめ分割部１４ａのすべてを錘本体１１径方向外側へ曲げて鍵２０の挿入孔２１内面に食い込ませ、鍵２０に固定しても良い。
　図７では鍵ユニットの符号を２０Ｂとしている。 For example, as shown in FIG. 7, the keyboard weight 10 inserted into the insertion hole 21 of the key 20 is configured such that all of the plurality of caulking division portions 14 a of the caulking portions 14 at both ends in the axial direction of the weight body 11 are radially outward of the weight body 11. May be bent into the inner surface of the insertion hole 21 of the key 20 and fixed to the key 20.
In FIG. 7, the code of the key unit is 20B.
　本発明に係る鍵盤錘及び鍵ユニットにおいて、溝は形成されなくても良く、かしめ部は錘本体の端面から突出して形成されても良い。 In the keyboard weight and the key unit according to the present invention, the groove may not be formed, and the caulking portion may be formed to protrude from the end surface of the weight body.
　本発明に係る鍵盤錘及び鍵ユニットにおいて、かしめ分割部（かしめ部）は軸方向から見て円弧状に限らず、例えば円形状、三角形状、扇形状など任意の形状に形成されて良い。 In the keyboard weight and the key unit according to the present invention, the caulking division portion (caulking portion) is not limited to an arc shape when viewed from the axial direction, and may be formed in an arbitrary shape such as a circular shape, a triangular shape, or a fan shape.
１０…鍵盤錘、１１…錘本体、１２…端面、１３…溝、１３ａ…外側内側面、１４…かしめ部、１４ａ…かしめ分割部、１４ｂ…スリット、２０Ａ、２０Ｂ…鍵ユニット、２０…鍵、２１…挿入孔、２２…鍵上面 DESCRIPTION OF SYMBOLS 10 ... Keyboard weight, 11 ... Weight main body, 12 ... End surface, 13 ... Groove, 13a ... Outer inner side surface, 14 ... Caulking part, 14a ... Caulking division | segmentation part, 14b ... Slit, 20A, 20B ... Key unit, 20 ... Key, 21 ... insertion hole, 22 ... key upper surface

Claims (6)

  1. 　柱状に形成された錘本体を備え、
    　前記錘本体の軸方向に直交する前記錘本体の端面の周縁部分に、前記端面の周縁に沿って延びる溝が形成され、
    　前記溝の内面のうち前記錘本体の径方向内側に向く前記溝の外側内側面が、前記軸方向において前記溝の底部から開口に向かうにしたがって、前記錘本体の径方向外側に傾斜し、前記軸方向に対する前記外側内側面の傾斜角度が、３０度以上である鍵盤錘。     It has a weight body formed in a columnar shape,
    A groove extending along the peripheral edge of the end surface is formed in the peripheral portion of the end surface of the weight main body perpendicular to the axial direction of the weight main body,
    Of the inner surface of the groove, the outer inner surface of the groove facing the radially inner side of the weight body is inclined radially outward of the weight body as it goes from the bottom of the groove to the opening in the axial direction, A keyboard weight having an inclination angle of the outer inner surface with respect to an axial direction of 30 degrees or more.
  2. 　側面に開口する挿入孔を有する鍵と、
    　前記挿入孔に挿入されて前記鍵にかしめ固定された鍵盤錘と、を備え、
    　前記鍵盤錘は、前記挿入孔に挿入される柱状の錘本体を有し、前記錘本体は軸方向の端部の周縁部分に形成され前記鍵の前記挿入孔の内面に食い込ませたかしめ部を有し、
    　前記かしめ部は、前記鍵の長手方向に対して、±４５度以内の領域に形成されている鍵ユニット。     A key having an insertion hole opened on a side surface;
    A keyboard weight inserted into the insertion hole and fixed to the key by caulking,
    The keyboard weight has a columnar weight main body inserted into the insertion hole, and the weight main body is formed at a peripheral edge portion of an end portion in the axial direction, and has a caulking portion that bites into an inner surface of the insertion hole of the key. Have
    The caulking portion is a key unit formed in an area within ± 45 degrees with respect to the longitudinal direction of the key.
  3. 　側面に開口する挿入孔を有する鍵と、
    　前記挿入孔に挿入されて前記鍵にかしめ固定された柱状の鍵盤錘と、を備え、
    　前記鍵盤錘は、前記挿入孔に挿入される柱状の錘本体を有し、前記錘本体は軸方向の端部の周縁部分に形成され前記鍵の前記挿入孔の内面に食い込ませたかしめ部を有し、
    　前記かしめ部は、前記鍵の長手方向に対して、±４５度以内の領域に形成され、
    　前記錘本体の直径Ｄは、前記鍵の厚みの６０％以上である鍵ユニット。     A key having an insertion hole opened on a side surface;
    A columnar keyboard weight inserted into the insertion hole and fixed to the key by caulking,
    The keyboard weight has a columnar weight main body inserted into the insertion hole, and the weight main body is formed at a peripheral edge portion of an end portion in the axial direction, and has a caulking portion that bites into an inner surface of the insertion hole of the key. Have
    The caulking portion is formed in a region within ± 45 degrees with respect to the longitudinal direction of the key,
    The weight unit has a diameter D of 60% or more of the thickness of the key.
  4. 　柱状に形成された錘本体の軸方向の端部の周縁部分に環状のかしめ部が形成され、
    　前記かしめ部には、当該かしめ部を三つ以上のかしめ分割部に分割する複数のスリットが形成され、
    　前記かしめ部の周方向における前記かしめ分割部の長さが、複数の前記かしめ分割部の間で互いに等しい鍵盤錘。     An annular caulking portion is formed at the peripheral edge portion of the axial end portion of the weight body formed in a columnar shape,
    The caulking portion is formed with a plurality of slits that divide the caulking portion into three or more caulking division portions,
    A keyboard weight in which the lengths of the caulking division portions in the circumferential direction of the caulking portions are equal to each other among the plurality of caulking division portions.
  5. 　柱状に形成された錘本体の軸方向の端部に、環状のかしめ部が形成され、
    　前記かしめ部には、当該かしめ部を複数のかしめ分割部に分割する複数のスリットが形成され、
    　前記かしめ部の周方向における前記スリットの幅寸法が、１ｍｍ以上、３ｍｍ以下である鍵盤錘。     An annular caulking portion is formed at the axial end of the weight body formed in a columnar shape,
    The caulking portion is formed with a plurality of slits that divide the caulking portion into a plurality of caulking division portions,
    A keyboard weight having a width dimension of 1 mm or more and 3 mm or less in the circumferential direction of the caulking portion.
  6. 　柱状に形成された錘本体の軸方向に直交する端面の周縁部分に前記端面の周縁に沿って延びる溝が形成された鍵盤錘を、鍵の側面に開口する挿入孔に挿入し、前記錘本体の前記溝にかしめ用工具のかしめ用突起を挿入することによって、前記鍵盤錘の径方向において前記溝の外側に位置するかしめ部を前記鍵盤錘の径方向外側へ曲げて前記鍵の前記挿入孔の内面に食い込ませることで前記鍵盤錘を前記鍵に固定する鍵ユニットの製造方法。 A keyboard weight having a groove extending along the peripheral edge of the end face is inserted into an insertion hole opened on a side surface of the key, and the weight main body is inserted into a peripheral edge portion of the end face perpendicular to the axial direction of the weight main body formed in a column shape. By inserting a caulking projection of a caulking tool into the groove, the caulking portion located outside the groove in the radial direction of the keyboard weight is bent outward in the radial direction of the keyboard weight, and the insertion hole of the key A key unit manufacturing method for fixing the keyboard weight to the key by biting into the inner surface of the key.
PCT/JP2017/011841 2017-03-23 2017-03-23 Keyboard weight, key unit, and method for manufacturing key unit WO2018173219A1 (en)

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JP7347022B2 (en) 2019-08-30 2023-09-20 ヤマハ株式会社 Weights for musical instruments, keyboards

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EP3605522A4 (en) 2020-11-25
EP3605522A1 (en) 2020-02-05
CN110447064A (en) 2019-11-12

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