EP3605522B1 - Keyboard weight, key unit, and method for manufacturing key unit - Google Patents
Keyboard weight, key unit, and method for manufacturing key unit Download PDFInfo
- Publication number
- EP3605522B1 EP3605522B1 EP17901665.4A EP17901665A EP3605522B1 EP 3605522 B1 EP3605522 B1 EP 3605522B1 EP 17901665 A EP17901665 A EP 17901665A EP 3605522 B1 EP3605522 B1 EP 3605522B1
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- EP
- European Patent Office
- Prior art keywords
- key
- weight
- crimping
- weight body
- keyboard
- 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.)
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- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 238000000034 method Methods 0.000 title claims description 8
- 238000003780 insertion Methods 0.000 claims description 55
- 230000037431 insertion Effects 0.000 claims description 55
- 230000002093 peripheral effect Effects 0.000 claims description 18
- 238000005452 bending Methods 0.000 claims description 12
- 238000002788 crimping Methods 0.000 claims 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- -1 and for example Chemical compound 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Images
Classifications
-
- 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 weight and a key unit used in a keyboard instrument, and a method for manufacturing the key unit.
- a metal weight (hereinafter also referred to as a keyboard weight) used for weight adjustment of key touch during performance is attached to each key of a keyboard in a keyboard instrument such as a piano. Specifically, the keyboard weight is inserted and fixed in a through hole horizontally penetrating the key.
- the keyboard weight is attached to each key so that the keys on the bass side of the keyboard become heavy and the keys on the treble side become light, thereby enhancing the sense of touch during performance.
- the keyboard weight one made of lead formed in a cylindrical shape is widely used.
- a metal material other than lead has been studied. It is conceivable to form the keyboard weight with a metal which is harder than lead, such as iron or the like.
- FIG. 1(a), (b) of Patent Document 1 disclose a configuration in which a cylindrical caulking portion protruding in the axial direction of the keyboard weight is formed on the peripheral edge of both end faces of the keyboard weight in the axial direction.
- a rod-like fixing tool is used from the left and right sides of the key to cause the cylindrical caulking parts at both axial ends in the axial direction to expand and bite into the inner wall of the through hole of the key, and thereby be fixed to the key.
- the keyboard weight of Patent Document 1 has a configuration in which a notched groove into which the caulking part falls into is formed on a facing surface opposed to the inner surface of the through hole of the key.
- Patent Document 1 Japanese Unexamined Patent Application, First Publication No. 2003-177740
- the present invention has as its object to provide a technique for improving the attachment of a keyboard weight to a key.
- a keyboard weight in embodiments of the invention includes a weight body formed in a cylindrical shape.
- a groove is formed in a peripheral edge portion of an end face of the weight body, the groove extending along a peripheral edge of the end face, the end face being perpendicular to an axial direction of the weight body, and an outward inner surface of the groove among inner surfaces of the groove slopes toward outside of the weight body from a bottom portion of the groove toward an opening in the axial direction, the outward inner surface facing toward inside of the weight body in the radial direction, and an inclination angle of the outward inner surface is 30° or greater relative to the axial direction.
- a key unit in one embodiment of the invention includes: a key including an insertion hole that opens to a side surface; and a keyboard weight that is inserted in the insertion hole and is caulked-fixed to the key.
- the keyboard weight includes a cylindrical weight body that is inserted in the insertion hole, and the weight body includes a caulking portion that is formed on 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, and the caulking portion is formed in a region within ⁇ 45° with respect to a lengthwise direction of the key.
- a key unit in one embodiment of the invention includes: a key including an insertion hole that opens to a side surface; and a cylindrical keyboard weight that is inserted in the insertion hole and is caulked-fixed to the key.
- the keyboard weight includes a cylindrical weight body that is inserted in the insertion hole, and the weight body includes a caulking portion that is formed on 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° with respect to a lengthwise direction of the key, and a diameter D of the weight body is equal to or greater than 60% of a thickness of the key.
- an annular caulking portion is formed on a peripheral edge portion of an end portion of a weight body in an axial direction of the weight body, the weight body being formed in a cylindrical shape, a plurality of slits are formed in the caulking portion, the plurality of slits dividing the caulking portion into four or more caulking divided portions, and lengths of the caulking divided portions in a circumferential direction of the caulking portion are equal to each other.
- an annular caulking portion is formed on an end portion of a weight body in an axial direction of the weight body, the weight body being formed in a cylindrical shape, a plurality of slits are formed in the caulking portion, the plurality of slits dividing the caulking portion into a plurality of caulking divided portions, and a width dimension of the slits in a circumferential direction of the caulking portion is 1 mm or more and 3 mm or less.
- a method for manufacturing a key unit in one embodiment of the invention comprising, by inserting a keyboard weight into an insertion hole of a key and inserting a caulking projection of a caulking tool into a groove of a weight body, bending the caulking portion to an outer side in a radial direction of the keyboard weight and causing the caulking portion to bite into an inner surface of the insertion hole of the key, to thereby fixing the keyboard weight to the key, the keyboard weight having a groove that is formed in a peripheral edge portion of an end face of the weight body, the groove extending along a peripheral edge of the end face, the end face being perpendicular to an axial direction of the weight body, the weight body being formed in a cylindrical shape, the insertion hole opening to a side surface of the key, the caulking portion being positioned on an outer side of the groove in the radial direction of the keyboard weight.
- a keyboard weight 10 of the embodiment shown in FIGS. 1 and 2 includes a weight body 11 formed in a pillar-like shape (cylindrical shape in FIGS. 1 and 2 ).
- the keyboard weight 10 is formed entirely of a metal such as iron, for example.
- the material for forming the keyboard weight 10 is not limited to iron, and for example, copper or the like can also be employed.
- the keyboard weight 10 is used by being inserted into and fixed in an insertion hole 21 formed in a key 20 of a keyboard of a keyboard instrument.
- a key unit 20A together with the key 20 are constituted by the keyboard weight 10 being fixed to the key 20.
- an end face 12 (hereinafter also referred to as a weight body end face 12) perpendicular to the axial direction of the weight body 11 is formed at both axial ends of the weight body 11 in the axial direction.
- a groove 13 extending along a peripheral edge of the weight body end face 12 is formed in the peripheral edge portion of the end face 12 of the weight body 11.
- the groove 13 is formed in an annular shape along the peripheral edge of the weight body end face 12.
- an outward inner surface 13a that faces toward the inside of the weight body 11 in the radial direction slopes toward the outside of the weight body 11 in the radial direction as the outward inner surface 13a extends from the bottom portion of the groove 13 toward an opening in the axial direction of the weight body 11.
- An inclination angle ⁇ of the outward inner surface 13a of the groove 13 relative to the axial direction of the weight body 11 is 30° or greater relative to the axial direction of the weight body 11.
- the inclination angle ⁇ of the outward inner surface 13a of the groove 13 is preferably 30° to 60°.
- an inward inner surface 13b facing the outward inner surface 13a in the width direction of the groove 13 is formed perpendicular to the radial direction of the weight body 11.
- the inclination angle of the inward inner surface 13b relative to the axial direction of the weight body 11 is 0°.
- 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 made to bite into an inner surface of the insertion hole 21 of the key 20 to function as a caulking portion for fixing the keyboard weight 10 to the key 20.
- the portion 14 positioned on the outer side of the groove 13 in the radial direction of the weight body 11 of the keyboard weight 10 is hereinafter referred to as the caulking portion 14.
- the caulking portion 14 is annularly formed in a peripheral edge portion at end portions of the weight body 11 in the axial direction.
- the caulking portion 14 is formed with a plurality of slits 14b that divide the caulking portion 14 into three or more caulking divided portions 14a.
- the lengths of the caulking divided portions 14a in the circumferential direction of the caulking portion 14 are equal to each other.
- the length of each of the caulking divided portions 14a in the circumferential direction of the caulking portion 14 may also differ from each other and for example be non-uniform.
- the caulking portion 14 shown in FIG. 1 and FIG. 6 is divided into four equally divided caulking divided portions 14a in the circumferential direction by the slits 14b formed at four positions in the circumferential direction of the caulking portion 14 (circumferential direction of the weight body 11).
- the width dimension of the slit 14b of the caulking portion 14 (the dimension in the circumferential direction of the caulking portion 14) be 1 mm or more and 3 mm or less.
- an insertion hole 21 in the key 20 is formed so as to extend from a side surface of the key 20 in a lateral direction (the vertical direction in FIG. 3 , the direction orthogonal to the paper surface in FIG. 6 ) of the key.
- the insertion hole 21 should be open to at least one of the side surfaces of both sides in the left-right direction of the key 20.
- 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 thereof and thereby opens to the side faces on both sides of the key 20 in the left-right direction.
- the keyboard weight 10 that is used is one in which the outer diameter of the cylindrical weight body 11 matches the inner diameter of the insertion hole 21 of the key 20 or one in which the outer diameter of the cylindrical weight body 11 is slightly smaller than the inner diameter of the insertion hole 21.
- the keyboard weight 10 is inserted into the insertion hole 21 so that the axial direction of the weight body 11 matches the depth direction of the insertion hole 21 of the key 20 (the axial direction of the insertion hole 21).
- the insertion hole 21 of the key 20 shown in FIG. 6 is formed at a plurality of positions in the lengthwise direction of the key 20 (the left-right direction in FIG. 6 ).
- the keyboard weight 10 is inserted into one of the insertion holes 21 selected from the plurality of insertion holes 21 of the key 20 and fixed to the key 20.
- the keyboard weight 10 inserted into the insertion hole 21 of the key 20 is fixed to the key 20 by using a caulking tool 30 to bend the caulking divided portions 14a of the caulking portion 14 on both sides of the weight body 11 in the axial direction to the outer side in the radial direction of the weight body 11 so as to bite into the inner surface of the insertion hole 21 of the key 20.
- the caulking tool 30 is constituted with a caulking projection 32 projecting out at a distal outer periphery of a rod-like tool body 31.
- the caulking projection 32 is for bending the caulking divided portions 14a of the keyboard weight 10 toward the outer side in the radial direction of the weight body 11.
- the caulking divided portion 14a pressed by the caulking projection 32 is bent to the outer side of the weight body 11 in the radial direction.
- the key unit 20A can be manufactured by the following method for manufacturing a key unit using the caulking tool 30 mentioned above.
- the keyboard weight 10 is inserted into the insertion hole 21 of the key 20.
- the caulking projections 32 of the caulking tool 30 are pushed into the groove 13 of the keyboard weight 10, and the caulking portions 14 on both sides in the axial direction of the weight body 11 of the keyboard weight 10 (specifically the caulking divided portions 14a) are bent outward in the radial direction of the weight body 11 to bite into the inner surface of the insertion hole 21 of the key 20, thereby fixing the keyboard weight 10 to the key 20.
- the key unit 20A can be manufactured.
- the bending of the caulking divided portions 14a to the outer side in the radial direction of the weight body 11 by the caulking projections 32 of the caulking tool 30 is not necessarily uniform over the of the caulking divided portions 14a in the circumferential direction of the caulking portion 14, with the existence of variations being possible.
- the deformation of the caulking divided portions 14a when bending the caulking divided portions 14a outward in the radial direction of the weight body 11 by the caulking tool 30 does not necessarily proceed uniformly and simultaneously over the entirety of the caulking divided portions 14a in the circumferential direction of the caulking portion 14.
- the width dimension of the slit 14b in the caulking portion 14 is 1 mm or more, when using the caulking tool 30 to bend the caulking division portion 14a outward in the radial direction of the weight body 11, it is possible to reliably avoid abutting of caulking divided portions 14a that are adjacent via the slit 14b and thereby bending of caulking divided portions 14a not to be bent (co-bending).
- the width dimension of the slit 14b of the caulking portion 14 is preferably 3 mm or less from the viewpoint of minimizing the amount of processing by machining and ease of formation.
- the caulking divided portions 14a formed in a region within ⁇ 45° with respect to the lengthwise direction of the key 20 are made to bite into the inner surface of the insertion hole 21 of the key 20 to be fixed to the key 20.
- the caulking divided portions 14a that bite into the inner surface of the insertion hole 21 of the key 20 are those positioned in regions in which the entirety in the circumferential direction of the caulking portions 14 is within ⁇ 45° with respect to the lengthwise direction of the key 20.
- the caulking divided portion 14a in which the entirety in the circumferential direction of the caulking portion 14 is positioned in a region within ⁇ 45° with respect to the lengthwise direction of the key 20 is hereinafter also referred to as a key lengthwise direction caulking divided portion.
- the key lengthwise direction caulking divided portion is positioned on both sides via the center axis of the weight body 11.
- a constitution in which only two caulking divided portions 14a arranged in regions within ⁇ 45° with respect to the lengthwise direction of the key 20 are made to bite into the inner surface of the insertion hole 21 of the key 20 to fix (caulking-fix) the keyboard weight 10 to the key 20 is advantageous in that it prevents minute deformation of the key 20 due to caulking-fixing 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 of the weight body 11 (weight body outer diameter) is equal to or greater than 60% of the thickness of the key 20 (vertical dimension in FIG. 6 ).
- the outward inner surface 13a of the groove 13 formed in the peripheral edge portion of the end face 12 of the weight body 11 slopes to the outside of the weight body 11 in the radial direction heading from the bottom portion of the groove 13 toward an opening in the axial direction of the weight body 11, the inclination angle of the outward inner surface 13a being 30° or greater relative to the axial direction of the weight body 11.
- the keyboard weight 10 of the present embodiment is one that enables a reduction in the cutting amount when for example being formed from a metal member by machining compared with the keyboard weight of FIGS. 1 (a) and 1 (b) of Patent Document 1. For this reason, in the keyboard weight 10 of the present embodiment, it is possible to reduce the amount of material discarded when forming by machining, and to shorten the forming time.
- the key unit 20A of the present embodiment in the caulking portion 14 of the keyboard weight 10, only the portions formed in a region within ⁇ 45° with respect to the lengthwise direction of the key 20 are made to bite into the inner surface of the insertion hole 21 of the key 20. For this reason, it is possible to easily avoid the caulking-fixing having an effect on the key upper surface 22.
- the keyboard weight 10 in the caulking portion 14 of the keyboard weight 10, only the portions formed in a region within ⁇ 45° with respect to the lengthwise 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 adopted in which the diameter of the weight body 11 is equal to or greater than 60% of the thickness of the key 20. For this reason, it is possible to expand the adjustment range of key touch weight adjustment with the keyboard weight 10.
- the plurality of slits 14b that divide the caulking portion 14 into three or more caulking divided portions 14a are formed in the annular caulking portion 14 at end portions of the weight body 11 in the axial direction, with the length of each of the caulking divided portions 14a in the circumferential direction of the caulking portion 14 being equal to one another among the plurality of caulking divided portions 14a.
- the force for bending the caulking portion outward in the radial direction of the weight body 11 to bite into the inner surface of the insertion hole 21 of the key 20 is smaller, and so the work of bending the caulking portion outward in the radial direction of the weight body 11 to caulk-fix the weight body 11 to the key 20 can be performed easily.
- 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 caulking portion 14 of the weight body 11 of the keyboard weight 10 can be bent outward in the radial direction of the weight body 11 to be made to bite into the inner surface of the insertion hole 21 of the key 20. Therefore, the fixing of the keyboard weight 10 to the key 20 can be performed easily and efficiently.
- all of the plurality of caulking divided portions 14a of each caulking portion 14 at both end portions of the weight body 11 in the axial direction may be bent outward in the radial direction of the weight body 11 to bite into the inner surface of the insertion hole 21 of the key 20 and thereby be fixed to the key 20.
- the reference numeral of the key unit is 20B.
- the groove may not be formed, and the caulking portion may be formed to project from the end faces of the weight body.
- the caulking divided portion is not limited to an arc when viewed from the axial direction, and may be formed into any shape such as a circle, a triangle, or a fan shape.
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- Multimedia (AREA)
- Electrophonic Musical Instruments (AREA)
- Insertion Pins And Rivets (AREA)
- Percussive Tools And Related Accessories (AREA)
Description
- The present invention relates to a keyboard weight and a key unit used in a keyboard instrument, and a method for manufacturing the key unit.
- Conventionally, a metal weight (hereinafter also referred to as a keyboard weight) used for weight adjustment of key touch during performance is attached to each key of a keyboard in a keyboard instrument such as a piano. Specifically, the keyboard weight is inserted and fixed in a through hole horizontally penetrating the key.
- For example, the keyboard weight is attached to each key so that the keys on the bass side of the keyboard become heavy and the keys on the treble side become light, thereby enhancing the sense of touch during performance.
- For the keyboard weight, one made of lead formed in a cylindrical shape is widely used. However, from the viewpoint of health and environmental impact, forming the keyboard weight with a metal material other than lead has been studied. It is conceivable to form the keyboard weight with a metal which is harder than lead, such as iron or the like.
- For example, FIG. 1(a), (b) of Patent Document 1 disclose a configuration in which a cylindrical caulking portion protruding in the axial direction of the keyboard weight is formed on the peripheral edge of both end faces of the keyboard weight in the axial direction. In the state of this keyboard weight being inserted in a through hole of the key, a rod-like fixing tool is used from the left and right sides of the key to cause the cylindrical caulking parts at both axial ends in the axial direction to expand and bite into the inner wall of the through hole of the key, and thereby be fixed to the key. In addition, in order to facilitate expansion of the cylindrical caulking part, the keyboard weight of Patent Document 1 has a configuration in which a notched groove into which the caulking part falls into is formed on a facing surface opposed to the inner surface of the through hole of the key.
- [Patent Document 1]
Japanese Unexamined Patent Application, First Publication No. 2003-177740 - The present invention has as its object to provide a technique for improving the attachment of a keyboard weight to a key.
- Solutions to the aforementioned problems are provided by the key unit according to claim 1 and the method for manufacturing a key unit according to claim 6.
- A keyboard weight in embodiments of the invention includes a weight body formed in a cylindrical shape. A groove is formed in a peripheral edge portion of an end face of the weight body, the groove extending along a peripheral edge of the end face, the end face being perpendicular to an axial direction of the weight body, and an outward inner surface of the groove among inner surfaces of the groove slopes toward outside of the weight body from a bottom portion of the groove toward an opening in the axial direction, the outward inner surface facing toward inside of the weight body in the radial direction, and an inclination angle of the outward inner surface is 30° or greater relative to the axial direction.
- A key unit in one embodiment of the invention includes: a key including an insertion hole that opens to a side surface; and a keyboard weight that is inserted in the insertion hole and is caulked-fixed to the key. The keyboard weight includes a cylindrical weight body that is inserted in the insertion hole, and the weight body includes a caulking portion that is formed on 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, and the caulking portion is formed in a region within ±45° with respect to a lengthwise direction of the key.
- A key unit in one embodiment of the invention includes: a key including an insertion hole that opens to a side surface; and a cylindrical keyboard weight that is inserted in the insertion hole and is caulked-fixed to the key. The keyboard weight includes a cylindrical weight body that is inserted in the insertion hole, and the weight body includes a caulking portion that is formed on 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° with respect to a lengthwise direction of the key, and a diameter D of the weight body is equal to or greater than 60% of a thickness of the key.
- In a keyboard weight in one embodiment of the invention, an annular caulking portion is formed on a peripheral edge portion of an end portion of a weight body in an axial direction of the weight body, the weight body being formed in a cylindrical shape, a plurality of slits are formed in the caulking portion, the plurality of slits dividing the caulking portion into four or more caulking divided portions, and lengths of the caulking divided portions in a circumferential direction of the caulking portion are equal to each other.
- In a keyboard weight in one embodiment of the invention, an annular caulking portion is formed on an end portion of a weight body in an axial direction of the weight body, the weight body being formed in a cylindrical shape, a plurality of slits are formed in the caulking portion, the plurality of slits dividing the caulking portion into a plurality of caulking divided portions, and a width dimension of the slits in a circumferential direction of the caulking portion is 1 mm or more and 3 mm or less.
- A method for manufacturing a key unit in one embodiment of the invention, comprising, by inserting a keyboard weight into an insertion hole of a key and inserting a caulking projection of a caulking tool into a groove of a weight body, bending the caulking portion to an outer side in a radial direction of the keyboard weight and causing the caulking portion to bite into an inner surface of the insertion hole of the key, to thereby fixing the keyboard weight to the key, the keyboard weight having a groove that is formed in a peripheral edge portion of an end face of the weight body, the groove extending along a peripheral edge of the end face, the end face being perpendicular to an axial direction of the weight body, the weight body being formed in a cylindrical shape, the insertion hole opening to a side surface of the key, the caulking portion being positioned on an outer side of the groove in the radial direction of the keyboard weight.
- According to the aspects of the present invention, it is possible to favorably attach a keyboard weight to a key.
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FIG. 1 is a perspective view showing a keyboard weight according to one embodiment of the present invention. -
FIG. 2 is a cross-sectional view of the keyboard weight shown inFIG. 1 . -
FIG. 3 is a cross-sectional view showing a state in which the keyboard weight is inserted into an insertion hole of a key in the operation of inserting and fixing the keyboard weight ofFIG. 1 into an insertion hole of a key. -
FIG. 4 is a cross-sectional view showing a state in which the keyboard weight ofFIG. 3 is caulked-fixed to a key. -
FIG. 5 is an enlarged cross-sectional view showing the vicinity of a caulking portion of the keyboard weight ofFIG. 4 . -
FIG. 6 is a side view showing an example of a key unit in which the keyboard weight ofFIG. 1 is fixed to a key. -
FIG. 7 is a view showing an example of a key unit not according to the invention, in which the keyboard weight ofFIG. 1 is fixed to a key, in which the plurality of caulking divided portions of the caulking portion of the keyboard weight are all bite into the inner surface of the key insertion hole. - Hereinbelow, one embodiment of the present invention will be described with reference to the appended drawings.
- A
keyboard weight 10 of the embodiment shown inFIGS. 1 and2 includes aweight body 11 formed in a pillar-like shape (cylindrical shape inFIGS. 1 and2 ). Thekeyboard weight 10 is formed entirely of a metal such as iron, for example. The material for forming thekeyboard weight 10 is not limited to iron, and for example, copper or the like can also be employed. - As shown in
FIGS. 4 to 6 , thekeyboard weight 10 is used by being inserted into and fixed in aninsertion hole 21 formed in akey 20 of a keyboard of a keyboard instrument. Akey unit 20A together with thekey 20 are constituted by thekeyboard weight 10 being fixed to thekey 20. - As shown in
FIGS. 1 and2 , an end face 12 (hereinafter also referred to as a weight body end face 12) perpendicular to the axial direction of theweight body 11 is formed at both axial ends of theweight body 11 in the axial direction. - A
groove 13 extending along a peripheral edge of the weightbody end face 12 is formed in the peripheral edge portion of theend face 12 of theweight body 11. Thegroove 13 is formed in an annular shape along the peripheral edge of the weightbody end face 12. - Among the inner surfaces of the
groove 13, an outwardinner surface 13a that faces toward the inside of theweight body 11 in the radial direction slopes toward the outside of theweight body 11 in the radial direction as the outwardinner surface 13a extends from the bottom portion of thegroove 13 toward an opening in the axial direction of theweight body 11. - An inclination angle θ of the outward
inner surface 13a of thegroove 13 relative to the axial direction of theweight body 11 is 30° or greater relative to the axial direction of theweight body 11. The inclination angle θ of the outwardinner surface 13a of thegroove 13 is preferably 30° to 60°. - In the
keyboard weight 10 shown inFIGS. 1 and2 , an inwardinner surface 13b facing the outwardinner surface 13a in the width direction of the groove 13 (groove width) is formed perpendicular to the radial direction of theweight body 11. The inclination angle of the inwardinner surface 13b relative to the axial direction of theweight body 11 is 0°. - As shown in
FIGS. 4 and5 , aportion 14 located outside thegroove 13 in the radial direction of theweight body 11 of thekeyboard weight 10 shown inFIGS. 1 and2 is made to bite into an inner surface of theinsertion hole 21 of thekey 20 to function as a caulking portion for fixing thekeyboard weight 10 to thekey 20. - The
portion 14 positioned on the outer side of thegroove 13 in the radial direction of theweight body 11 of thekeyboard weight 10 is hereinafter referred to as thecaulking portion 14. - The
caulking portion 14 is annularly formed in a peripheral edge portion at end portions of theweight body 11 in the axial direction. - The
caulking portion 14 is formed with a plurality ofslits 14b that divide thecaulking portion 14 into three or more caulking dividedportions 14a. In the present embodiment, the lengths of the caulking dividedportions 14a in the circumferential direction of thecaulking portion 14 are equal to each other. The length of each of the caulking dividedportions 14a in the circumferential direction of thecaulking portion 14 may also differ from each other and for example be non-uniform. - The
caulking portion 14 shown inFIG. 1 andFIG. 6 is divided into four equally divided caulking dividedportions 14a in the circumferential direction by theslits 14b formed at four positions in the circumferential direction of the caulking portion 14 (circumferential direction of the weight body 11). - It is preferable that the width dimension of the
slit 14b of the caulking portion 14 (the dimension in the circumferential direction of the caulking portion 14) be 1 mm or more and 3 mm or less. - As shown in
FIGS. 3 and6 , aninsertion hole 21 in thekey 20 is formed so as to extend from a side surface of thekey 20 in a lateral direction (the vertical direction inFIG. 3 , the direction orthogonal to the paper surface inFIG. 6 ) of the key. - The
insertion hole 21 should be open to at least one of the side surfaces of both sides in the left-right direction of thekey 20. Theinsertion hole 21 of thekey 20 shown inFIG. 3 is formed so as to penetrate thekey 20 in the left-right direction thereof and thereby opens to the side faces on both sides of thekey 20 in the left-right direction. - As shown in
FIG. 3 , thekeyboard weight 10 that is used is one in which the outer diameter of thecylindrical weight body 11 matches the inner diameter of theinsertion hole 21 of thekey 20 or one in which the outer diameter of thecylindrical weight body 11 is slightly smaller than the inner diameter of theinsertion hole 21. - The
keyboard weight 10 is inserted into theinsertion hole 21 so that the axial direction of theweight body 11 matches the depth direction of theinsertion hole 21 of the key 20 (the axial direction of the insertion hole 21). - The
insertion hole 21 of the key 20 shown inFIG. 6 is formed at a plurality of positions in the lengthwise direction of the key 20 (the left-right direction inFIG. 6 ). - The
keyboard weight 10 is inserted into one of the insertion holes 21 selected from the plurality of insertion holes 21 of the key 20 and fixed to the key 20. - As shown in
FIGS. 3 and4 , thekeyboard weight 10 inserted into theinsertion hole 21 of the key 20 is fixed to the key 20 by using acaulking tool 30 to bend the caulking dividedportions 14a of thecaulking portion 14 on both sides of theweight body 11 in the axial direction to the outer side in the radial direction of theweight body 11 so as to bite into the inner surface of theinsertion hole 21 of the key 20. - The
caulking tool 30 is constituted with acaulking projection 32 projecting out at a distal outer periphery of a rod-like tool body 31. Thecaulking projection 32 is for bending the caulking dividedportions 14a of thekeyboard weight 10 toward the outer side in the radial direction of theweight body 11. - By pushing the
caulking projection 32 of thecaulking tool 30 into thegroove 13 of thekeyboard weight 10 along the outwardinner surface 13a of the caulking dividedportion 14a, the caulking dividedportion 14a pressed by thecaulking projection 32 is bent to the outer side of theweight body 11 in the radial direction. - The
key unit 20A can be manufactured by the following method for manufacturing a key unit using thecaulking tool 30 mentioned above. - When manufacturing the
key unit 20A, firstly, as shown inFIG. 3 , thekeyboard weight 10 is inserted into theinsertion hole 21 of the key 20. Next, as shown inFIGS. 4 and5 , thecaulking projections 32 of thecaulking tool 30 are pushed into thegroove 13 of thekeyboard weight 10, and thecaulking portions 14 on both sides in the axial direction of theweight body 11 of the keyboard weight 10 (specifically the caulking dividedportions 14a) are bent outward in the radial direction of theweight body 11 to bite into the inner surface of theinsertion hole 21 of the key 20, thereby fixing thekeyboard weight 10 to the key 20. Thereby, thekey unit 20A can be manufactured. - The bending of the caulking divided
portions 14a to the outer side in the radial direction of theweight body 11 by thecaulking projections 32 of thecaulking tool 30 is not necessarily uniform over the of the caulking dividedportions 14a in the circumferential direction of thecaulking portion 14, with the existence of variations being possible. The deformation of the caulking dividedportions 14a when bending the caulking dividedportions 14a outward in the radial direction of theweight body 11 by thecaulking tool 30 does not necessarily proceed uniformly and simultaneously over the entirety of the caulking dividedportions 14a in the circumferential direction of thecaulking portion 14. - If the width dimension of the
slit 14b in thecaulking portion 14 is 1 mm or more, when using thecaulking tool 30 to bend thecaulking division portion 14a outward in the radial direction of theweight body 11, it is possible to reliably avoid abutting of caulking dividedportions 14a that are adjacent via theslit 14b and thereby bending of caulking dividedportions 14a not to be bent (co-bending). - In addition, the width dimension of the
slit 14b of thecaulking portion 14 is preferably 3 mm or less from the viewpoint of minimizing the amount of processing by machining and ease of formation. - In the
keyboard weight 10 of thekey unit 20A shown inFIG. 6 , only the caulking dividedportions 14a formed in a region within ±45° with respect to the lengthwise direction of the key 20 are made to bite into the inner surface of theinsertion hole 21 of the key 20 to be fixed to the key 20. The caulking dividedportions 14a that bite into the inner surface of theinsertion hole 21 of the key 20 are those positioned in regions in which the entirety in the circumferential direction of thecaulking portions 14 is within ±45° with respect to the lengthwise direction of the key 20. - The caulking divided
portion 14a in which the entirety in the circumferential direction of thecaulking portion 14 is positioned in a region within ±45° with respect to the lengthwise direction of the key 20 is hereinafter also referred to as a key lengthwise direction caulking divided portion. - In the
keyboard weight 10, the key lengthwise direction caulking divided portion is positioned on both sides via the center axis of theweight body 11. - In the
keyboard weight 10 of thekey unit 20A shown inFIG. 6 , of the four caulking dividedportions 14a, specifically only the two positioned on both sides via the center axis of theweight body 11 are arranged in regions within ±45° with respect to the lengthwise direction of the key 20, with the other two being arranged outside regions within ±45° with respect to the lengthwise direction of the key 20. In thekeyboard weight 10 of thekey unit 20A shown inFIG. 6 , only the two caulking dividedportions 14a (key lengthwise direction caulking divided portions) arranged in regions within ±45° with respect to the lengthwise direction of the key 20 are made to bite into the inner surface of theinsertion hole 21 of the key 20 to be fixed to the key 20. - As shown in
FIG. 6 , a constitution in which only two caulking dividedportions 14a arranged in regions within ±45° with respect to the lengthwise direction of the key 20 are made to bite into the inner surface of theinsertion hole 21 of the key 20 to fix (caulking-fix) thekeyboard weight 10 to the key 20 is advantageous in that it prevents minute deformation of the key 20 due to caulking-fixing from affecting theupper surface 22 of the key 20 (hereinafter also referred to as the key upper surface 22). - In order to avoid a minute deformation of the key due to caulking-fixing of the keyboard weight having an effect on the key upper surface, it was conventionally common to use a keyboard weight whose diameter is less than 60% of the thickness of the key.
- On the other hand, in the configuration in which only the key lengthwise direction caulking divided portions on both sides via the center axis of the
weight body 11 are made to bite into the inner surface of theinsertion hole 21 of the key 20 to fix thekeyboard weight 10 to the key 20, even if thekeyboard weight 10 is used having a weight body with a larger diameter than a conventional configuration, it is possible to avoid the caulking-fixing of thekeyboard weight 10 having an effect on the keyupper surface 22. - Therefore, in the
key unit 20A in which only the key lengthwise direction caulking divided portions on both sides via the center axis of theweight body 11 are made to bite into the inner surface of theinsertion hole 21 of the key 20 to fix thekeyboard weight 10 to the key 20 as shown inFIG. 6 , it is possible to use thekeyboard weight 10 in which the diameter D of the weight body 11 (weight body outer diameter) is equal to or greater than 60% of the thickness of the key 20 (vertical dimension inFIG. 6 ). - As described above, according to the
keyboard weight 10 of the present embodiment, the outwardinner surface 13a of thegroove 13 formed in the peripheral edge portion of theend face 12 of theweight body 11 slopes to the outside of theweight body 11 in the radial direction heading from the bottom portion of thegroove 13 toward an opening in the axial direction of theweight body 11, the inclination angle of the outwardinner surface 13a being 30° or greater relative to the axial direction of theweight body 11. For this reason, simply by applying a pressing force in the axial direction of theweight body 11 to the outwardinner surface 13a causes the portion (caulking portion 14) positioned outside thegroove 13 of theweight body 11 to bend outward in the radial direction of theweight body 11 to bite into the inner surface of theinsertion hole 21 of the key 20, and thereby it is possible to fix (caulking-fix) thekeyboard weight 10 to the key 20. - Moreover, the
keyboard weight 10 of the present embodiment is one that enables a reduction in the cutting amount when for example being formed from a metal member by machining compared with the keyboard weight of FIGS. 1 (a) and 1 (b) of Patent Document 1. For this reason, in thekeyboard weight 10 of the present embodiment, it is possible to reduce the amount of material discarded when forming by machining, and to shorten the forming time. - Further, according to the
key unit 20A of the present embodiment, in thecaulking portion 14 of thekeyboard weight 10, only the portions formed in a region within ±45° with respect to the lengthwise direction of the key 20 are made to bite into the inner surface of theinsertion hole 21 of the key 20. For this reason, it is possible to easily avoid the caulking-fixing having an effect on the keyupper surface 22. - According to the
key unit 20A of the present embodiment, in thecaulking portion 14 of thekeyboard weight 10, only the portions formed in a region within ±45° with respect to the lengthwise direction of the key 20 are made to bite into the inner surface of theinsertion hole 21 of the key 20, and thekeyboard weight 10 is adopted in which the diameter of theweight body 11 is equal to or greater than 60% of the thickness of the key 20. For this reason, it is possible to expand the adjustment range of key touch weight adjustment with thekeyboard weight 10. - According to the
keyboard weight 10 of the present embodiment, the plurality ofslits 14b that divide thecaulking portion 14 into three or more caulking dividedportions 14a are formed in theannular caulking portion 14 at end portions of theweight body 11 in the axial direction, with the length of each of the caulking dividedportions 14a in the circumferential direction of thecaulking portion 14 being equal to one another among the plurality of caulking dividedportions 14a. For this reason, compared to an annular caulking portion that does not have slits and is not divided, the force for bending the caulking portion outward in the radial direction of theweight body 11 to bite into the inner surface of theinsertion hole 21 of the key 20 is smaller, and so the work of bending the caulking portion outward in the radial direction of theweight body 11 to caulk-fix theweight body 11 to the key 20 can be performed easily. - According to the
keyboard weight 10 of the present embodiment, the width dimension of theslit 14b in the circumferential direction of theannular caulking portion 14 is 1 mm or more and 3 mm or less. Thereby, when bending the caulking dividedportion 14a outward in the radial direction of theweight body 11, bending (co-bending) of the caulking dividedportions 14a not to be bent can be reliably avoided. Moreover, thiskeyboard weight 10 enables the machining for forming theslit 14b to be minimized to a small amount. - According to the method for manufacturing the key unit of the present embodiment, just by inserting the
keyboard weight 10 into theinsertion hole 21 of the key 20 and pushing thecaulking projection 32 of thecaulking tool 30 into thegroove 13 of theweight body 11, thecaulking portion 14 of theweight body 11 of thekeyboard weight 10 can be bent outward in the radial direction of theweight body 11 to be made to bite into the inner surface of theinsertion hole 21 of the key 20. Therefore, the fixing of thekeyboard weight 10 to the key 20 can be performed easily and efficiently. - Although this invention was demonstrated in detail in the foregoing, this invention is not limited to the above embodiment, and it is possible to make various changes in the range that does not depart from the scope of the invention as defined by the attached claims.
- In an example outside the scope of the present invention, as shown in
FIG. 7 , in thekeyboard weight 10 that is inserted into theinsertion hole 21 of the key 20, all of the plurality of caulking dividedportions 14a of eachcaulking portion 14 at both end portions of theweight body 11 in the axial direction may be bent outward in the radial direction of theweight body 11 to bite into the inner surface of theinsertion hole 21 of the key 20 and thereby be fixed to the key 20. - In
FIG. 7 , the reference numeral of the key unit is 20B. - 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 project from the end faces of the weight body.
- In the keyboard weight and the key unit according to the present invention, the caulking divided portion (caulking portion) is not limited to an arc when viewed from the axial direction, and may be formed into any shape such as a circle, a triangle, or a fan shape.
-
- 10: Keyboard weight
- 11: Weight body
- 12: End face
- 13: Groove
- 13a: Outward inner surface
- 14: Caulking portion
- 14a: Caulking divided portion
- 14b: Slit
- 20A, 20B: Key unit
- 20: Key
- 21: Insertion hole
- 22: Key upper surface
Claims (6)
- A key unit (20A) comprising:a key (20) that extends in a lengthwise direction, the key (20) comprising an insertion hole (21) that opens to a side surface and extends in a direction orthogonal to the lengthwise direction; anda keyboard weight (10) that is inserted in the insertion hole (21) and is crimped and fixed to the key (20),wherein the keyboard weight (10) comprises a cylindrical weight body (11) that is inserted in the insertion hole (21), and the weight body (11) comprises a crimping portion (14) that is formed on a peripheral edge portion of an end portion in an axial direction and that bites into an inner surface of the insertion hole (21) of the key (20), andthe crimping portion (14) comprises four crimping divided portions (14a) that comprise: two crimping divided portions (14a) that are positioned on both sides of the weight body (11) in the axial direction and are formed in regions within ±45° with respect to the lengthwise direction of the key (20); and two crimping divided portions (14a) that are arranged outside the regions within ±45° with respect to the lengthwise direction of the key (20),characterized in that:
among the four crimping divided portions (14a), only the two crimping divided portions (14a) that are formed in the regions within ±45° bite into the inner surface of the insertion hole (21) of the key (20). - The key unit (20A) according to claim 1,wherein a groove (13) is formed in a peripheral edge portion of an end face (12) of the weight body (11), the groove (13) extending along a peripheral edge of the end face (12), the end face (12) being perpendicular to the axial direction of the weight body (11), andan outward inner surface (13a) of the groove (13) among inner surfaces of the groove (13) slopes toward outside of the weight body (11) from a bottom portion of the groove (13) toward an opening in the axial direction, the outward inner surface (13a) facing toward inside of the weight body (11) in the radial direction, and an inclination angle of the outward inner surface (13a) is 30° or greater relative to the axial direction.
- The key unit (20A) according to claim 1, wherein:
a diameter (D) of the weight body (11) is equal to or greater than 60% of a thickness of the key (20). - The key unit (20A) according to claim 1, whereinthe crimping portion (14) has an annular shape,a plurality of slits (14b) are formed in the crimping portion (14), the plurality of slits (14b) dividing the crimping portion (14) into the four crimping divided portions (14a), andlengths of the four crimping divided portions (14a) in a circumferential direction of the crimping portion (14) are equal to each other.
- The key unit (20A) according to claim 1, whereinthe crimping portion (14) has an annular shape,a plurality of slits (14b) are formed in the crimping portion (14), the plurality of slits (14b) dividing the crimping portion (14) into the four crimping divided portions (14a), anda width dimension of the slits (14b) in a circumferential direction of the crimping portion (14) is 1 mm or more and 3 mm or less.
- A method for manufacturing a key unit (20A), comprising, by inserting a keyboard weight (10) into an insertion hole (21) of a key (20) and inserting a crimping projection (32) of a crimping tool (30) into a groove (13) of a weight body (10), bending the crimping portion (14) to an outer side in a radial direction of the keyboard weight (10) and causing the crimping portion (14) to bite into an inner surface of the insertion hole (21) of the key (20), to thereby fixing the keyboard weight (10) to the key (20), the keyboard weight (10) having a groove (13) that is formed in a peripheral edge portion of an end face (12) of the weight body (10), the key (20) extending in a lengthwise direction, the groove (13) extending along a peripheral edge of the end face (12), the end face (12) being perpendicular to an axial direction of the weight body (10), the weight body (10) being formed in a cylindrical shape, the insertion hole (21) opening to a side surface of the key (20) and extending in a direction orthogonal to the lengthwise direction, the crimping portion (14) being positioned on an outer side of the groove (13) in the radial direction of the keyboard weight (10),wherein the crimping portion (14) comprises four crimping divided portions (14a) that comprise: two crimping divided portions (14a) that are positioned on both sides of the weight body (11) in the axial direction and are formed in regions within ±45° with respect to the lengthwise direction of the key (20); and two crimping divided portions (14a) that are arranged outside the regions within ±45° with respect to the lengthwise direction of the key (20),characterized in that:
among the four crimping divided portions (14a), only the two crimping divided portions (14a) that are formed in the regions within ±45° bite into the inner surface of the insertion hole (21) of the key (20).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2017/011841 WO2018173219A1 (en) | 2017-03-23 | 2017-03-23 | Keyboard weight, key unit, and method for manufacturing key unit |
Publications (3)
Publication Number | Publication Date |
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EP3605522A1 EP3605522A1 (en) | 2020-02-05 |
EP3605522A4 EP3605522A4 (en) | 2020-11-25 |
EP3605522B1 true EP3605522B1 (en) | 2022-02-09 |
Family
ID=63585328
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP17901665.4A Active EP3605522B1 (en) | 2017-03-23 | 2017-03-23 | Keyboard weight, key unit, and method for manufacturing key unit |
Country Status (4)
Country | Link |
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EP (1) | EP3605522B1 (en) |
JP (1) | JP6760482B2 (en) |
CN (1) | CN110447064B (en) |
WO (1) | WO2018173219A1 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP7347022B2 (en) * | 2019-08-30 | 2023-09-20 | ヤマハ株式会社 | Weights for musical instruments, keyboards |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6531651B2 (en) * | 1999-11-11 | 2003-03-11 | Kabushiki Kaisha Kawai Gakki Seisakusho | Key for musical instrument |
JP2003084754A (en) * | 2001-09-07 | 2003-03-19 | Kawai Musical Instr Mfg Co Ltd | Keyboard |
JP2003122344A (en) * | 2001-10-09 | 2003-04-25 | Kawai Musical Instr Mfg Co Ltd | Keyboard |
JP2003177740A (en) * | 2001-12-12 | 2003-06-27 | Kawai Musical Instr Mfg Co Ltd | Keyboard weight |
JP2003337582A (en) * | 2002-03-15 | 2003-11-28 | Yamaha Corp | Keyboard or keyboard instrument |
US7345235B2 (en) * | 2004-03-17 | 2008-03-18 | Yamaha Corporation | Keyboard musical instrument having keys equipped with balancers biting into keys and method for securing balancers to keys |
JP2006003375A (en) * | 2004-05-18 | 2006-01-05 | Daisee Kogyo Kk | Lead substitutive weight mounting structure and lead-free alternative weight |
JP2006047909A (en) * | 2004-08-09 | 2006-02-16 | Sangyo Kankyo Sogo Kenkyusho:Kk | Keyboard of keyboard instrument |
JP2006079075A (en) * | 2004-08-09 | 2006-03-23 | Daisee Kogyo Kk | Keyboard structure and keyboard mounting method |
JP4651350B2 (en) * | 2004-10-05 | 2011-03-16 | ヤマハ株式会社 | Key weight |
JP2006106368A (en) * | 2004-10-05 | 2006-04-20 | Yamaha Corp | Weight for key |
CN203210475U (en) * | 2013-04-23 | 2013-09-25 | 浙江林碳木业科技有限公司 | Large-size fast-growing wood finger-joint board |
-
2017
- 2017-03-23 CN CN201780088748.3A patent/CN110447064B/en active Active
- 2017-03-23 WO PCT/JP2017/011841 patent/WO2018173219A1/en unknown
- 2017-03-23 EP EP17901665.4A patent/EP3605522B1/en active Active
- 2017-03-23 JP JP2019506852A patent/JP6760482B2/en active Active
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JP6760482B2 (en) | 2020-09-23 |
JPWO2018173219A1 (en) | 2019-11-07 |
CN110447064B (en) | 2023-09-12 |
EP3605522A4 (en) | 2020-11-25 |
EP3605522A1 (en) | 2020-02-05 |
WO2018173219A1 (en) | 2018-09-27 |
CN110447064A (en) | 2019-11-12 |
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