JPH10161649A - Automatic playing device of keyed instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the force given to the plunger of an electromagnetic actuator without increasing the number of part items in an automatic playing device. SOLUTION: A plurality of electromagnetic actuators 63, 64 for vertically moving a plunger 110A or 110B by a solenoid 100 to strike a key 1 are supported by a support unit 62. The support unit 62 has a vertical wall 70b, and the yokes 90 of the electromagnetic actuators 63, 64 are installed zigzag to the upper and lower stages of the vertical wall 70b. The vertical wall 70b is formed of a magnetic material, which forms a part of the magnetic path of the solenoid 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic musical instrument for a keyboard instrument.

[0002]

2. Description of the Related Art An automatic performance device for a keyboard instrument controls the energization of an electromagnetic actuator, and rotates a key with a plunger of the electromagnetic actuator. In general, there is no room for providing an electromagnetic actuator in front of a keyboard instrument. Therefore, usually, the electromagnetic actuator is provided below a rear end of a key, and the rear end is raised. As this type of automatic performance device, there are a type in which an electromagnetic actuator and the like are incorporated in a keyboard instrument in advance at the time of manufacture, and a type in which an electromagnetic actuator and the like are incorporated in a normal keyboard instrument in advance.

In an ordinary keyboard instrument, a keyboard is supported on a shelf plate. Therefore, when an electromagnetic actuator or the like is to be incorporated later, first, a storage hole (or a plurality of electromagnetic actuators) is provided on the shelf plate. A storage groove is formed to expose the rear end of the key below the shelf. Then, a support for supporting a large number of electromagnetic actuators corresponding to the number of keys is attached to, for example, a shelf, so that the electromagnetic actuators are located below each key.

[0004] US Patent No. 4,031,796 and Japanese Utility Model Publication No.
According to the technique disclosed in Japanese Patent Application Laid-Open No. 2-37269, a panel having a groove extending in a lateral direction is used as a support, and a yoke of an electromagnetic actuator is slidably engaged with the groove. The panel is fastened with screws. Here, the yoke supports the solenoid of the electromagnetic actuator and forms a magnetic path of the solenoid at the same time.

[0005]

The panel used in the above-mentioned technology which has been put to practical use is a non-magnetic material. Therefore, if no measures are taken, the magnetic path of the solenoid will be provided only by the yoke, and there is a possibility that a small and low power consumption solenoid may not have sufficient force to move and plunge the plunger. is there.
For this reason, US Pat. No. 4,031,796 and Japanese Utility Model Publication No. Sho 62
In the technique disclosed in JP-A-37269, a small piece made of a magnetic material is arranged on the side opposite to the magnetic path provided by the yoke, and the small piece also forms a magnetic path, so that the force applied to the plunger is approximately doubled. Has increased. However, this increases the number of parts, complicates the assembling work, and increases the manufacturing cost.

[0006] Further, members such as pedals and pedal levers are provided inside a keyboard instrument such as a grand piano, particularly below a shelf plate, and the space in which a support to which an electromagnetic actuator is attached can be very limited. Have been.
Also, from the viewpoint of work efficiency, it is desirable that the size of the support is small so as not to hit the pedal or the pedal lever when the support is mounted. However, in the prior art, such consideration was insufficient, and a panel that was long in the vertical direction was used. Further, these panels are flat and may fall down without any support before being mounted at a predetermined position on the keyboard instrument. Therefore, when performing the mounting operation under the shelf board of the keyboard instrument, the operator has to support the panel so as not to fall down.

The present invention has been made in view of the above circumstances, and can increase the force applied to the plunger without increasing the number of parts, can reduce the size of the support, and handle it. It is an object of the present invention to provide an automatic performance apparatus for a keyboard instrument that can be easily performed.

[0008]

In order to solve the above problems, an automatic performance apparatus for a keyboard instrument according to the present invention has a plunger and electromagnetic driving means for moving the plunger in a substantially vertical direction. A plurality of electromagnetic actuators for performing key tapping on a plurality of keys by the plunger, and a support for supporting the electromagnetic actuator, wherein the electromagnetic driving means of the electromagnetic actuator is mounted on an upper stage and a lower stage of the support. And the support forms a part of a magnetic path of the electromagnetic driving means. According to the present invention, the support not only supports the electromagnetic actuator, but also forms a part of the magnetic path of the electromagnetic driving means of the electromagnetic actuator. Therefore, the force applied to the plunger by the electromagnetic driving means can be increased. For example, in a structure in which the electromagnetic driving means is supported by the yoke and the yoke is attached to the support, magnetic paths are provided in front and rear of the electromagnetic driving means by the yoke and the support,
It is possible to give a stronger lifting force to the plunger as compared to a case where one magnetic path is provided only by the yoke. In addition, since one magnetic path is constituted by a support for supporting the electromagnetic actuator, the number of parts does not increase and the manufacturing cost does not need to be increased.

The support has an upright wall,
The electromagnetic actuator supports the electromagnetic drive means, and has yokes each forming a magnetic path of the electromagnetic drive means, and the yokes are arranged in a staggered manner on the upper and lower stages on one surface of the upright wall. Each yoke has an upper flange and a lower flange attached to the upright wall, and the lower flange of the yoke attached to the upper tier is narrowed downward. It is preferable that the upper flange of the yoke mounted on the lower tier be narrowed upward. Although the horizontal spacing of each electromagnetic actuator needs to be approximately equal to the spacing of each key, in the above configuration, even if a relatively large coil is used for each electromagnetic actuator, the flange below the yoke of the upper electromagnetic actuator And the upper flange of the lower electromagnetic actuator can be prevented from hitting. This can increase the force applied to the plunger. Moreover, it is easy to narrow the interval between the upper electromagnetic actuator and the lower electromagnetic actuator in the vertical direction. Therefore, the size of the support in the vertical direction can be reduced, and the work of mounting the support in a limited space can be easily performed. In addition, it is possible to prevent the plunger of the lower electromagnetic actuator from becoming too long, to suppress the occurrence of problems such as vibration and bending, and to stabilize the keying operation.

The support has a first standing wall, a flat bottom wall, and a second standing wall opposed to the first standing wall, and the electromagnetic actuator comprises a second standing wall. It is preferable to be mounted on the inner surface of the first standing wall facing the standing wall. In this case, the electromagnetic actuator is arranged in a space provided by the first standing wall, the bottom wall, and the second standing wall.
When attaching the support to the keyboard instrument, there is a risk that the support and the electromagnetic actuator may hit other members,
The electromagnetic actuator is protected from such impact by the first standing wall, the bottom wall, and the second standing wall. Further, it is possible to place the flat bottom wall in contact with the floor surface. Therefore, there is no need to support the support member or the like so as not to fall down during the mounting operation. For these reasons, the support can be easily handled, and the load of the mounting operation can be reduced.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

A. Overall Configuration of Keyboard Instrument One embodiment of the present invention will be described below with reference to the drawings. First, FIG. 1 shows a main part of a grand piano which is a keyboard instrument provided with an automatic performance device according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a key constituting a keyboard, and 2 denotes a shelf board. A large number of keys 1 are arranged in the direction perpendicular to the paper of the drawing.
Each key 1 is a reed (key frame) placed on a shelf 2
3 above.

As shown in FIG. 2, the reed 3 is composed of three long plates arranged in parallel with each other.
During reed (balance rail) 5 and after reed (back rail)
6 and two wives 7 which are long plates connecting these both ends.
(Tie plate), and placed in parallel with wife 7 and in front of reed 4,
It is formed in a rectangular frame shape from a plurality of hollows (type plates) 8 which are long plates connecting the middle of the reed 5 and the rear of the reed 6. The front 4 of the reed, the middle 5 of the reed, the rear 6, the wife 7 and the indentation 8 are made of wood, and their joints are joined by cutting a tenon and bonding.

As shown in FIG. 1, a balance pin 9 is provided upright on the upper surface of the reed 5, and the balance pin 9 passes through the center of each key 1. The balance pin 9 suppresses the movement of the key 1 in the front-rear direction, and at the same time, allows the counterclockwise rotation in the figure. Front pins 10 and 11 are provided upright on the upper surface of the front 4 of the reed.
The tops of the front pins 10 and 11 are made to penetrate inside the front part of the key 1, thereby suppressing the key 1 from swaying (swaying in the direction perpendicular to the paper surface). Further, as shown in FIG.
A is attached, and a buffer cloth 12B is attached to the lower surface of the rear end of the key 1 similarly. When the key 1 is returned, the felt 12A and the cloth 12B abut. In this way, all keys 1 constituting the keyboard are supported by the reed 3. Note that the rear end of the key 1 is made to protrude more rearward than the reed 6.

A string (not shown) extending horizontally in the front-rear direction (left-right direction in the drawing) is stretched above the pivoting end on the rear end side of the key 1 so as to correspond to the key 1. As shown in FIG. 1, a hammer action mechanism 20 is provided between the string and the key 1 to strike the string by the operation of the key 1. In the above configuration, when the player presses the left front end of the key 1 in FIG. 1, the key 1 rotates counterclockwise in the figure around the center portion penetrated by the balance pin 9. The hammer action mechanism 20 linked to the key 1 is driven, and the hammer 25 of the hammer action mechanism 20 strikes a string to generate a sound. Note that the hammer action mechanism 20 is known, and a detailed description thereof will be omitted.

The shelf 2 is horizontally fixed to the upper end of the leg 15 via a foot girder 16. Reference numerals 17 and 18 denote a pedal support rod and a pedal support provided on the lower surface of the shelf 2, and the pedal support 1 has a pedal suspension 1 extending downward.
9 are supported. At the lower end of the pedal suspension 19, a soft pedal, a loud pedal, and a sostenuto pedal (not shown) are provided. Each of these pedals
This pedal is used to reduce, increase, or prolong the sound. The operation of these pedals is shown in FIG. 3 (the bottom view of the shelf 2).
Soft pedal lever 31, loud pedal lever 3 shown
2, and transmitted to a predetermined mechanism via the sostenuto pedal lever 33. Since the mechanism related to the pedal is the same as that of a well-known piano, the detailed description is omitted, and is omitted in FIG. When the player steps on the soft pedal, the soft pedal lever 31
The whole is pressed laterally.

As shown in FIG. 1, the lower surface of the front of the reed 4 of the reed 3 is inclined with respect to the wife 7 and the indentation 8, so that the front edge of the front of the reed 4 is the shelf board 2. Is in line contact with the upper surface of A bedding screw 13 is screwed to the lower surface of the reed 5 at appropriate intervals in a direction perpendicular to the paper surface. Point contact with the upper surface. Further, the lower surface of the reed 6 is also inclined with respect to the wife 7 and the indentation 8, and the upper surface of the support member 14 arranged substantially flush with the upper surface of the shelf 2 Is in line contact. By such a contact state, the reed 3 can move all the keys 1 supported by the reed 3 collectively in the horizontal direction (vertical direction on the paper).

As shown in FIG. 2, on both sides on the front side of the shelf 2, a clasp 35 is detachably fixed by screws. A pin 36 projects from each clap 35, and the front of the reed 3 of the reed 3 is pressed toward the shelf 2 from above by the pin 36. A plurality of keyboard grips 37 are attached to the rear part of the shelf board 2 at intervals, and the keyboard grips 37 prevent the vertical movement of the reed 6 and the horizontal direction of the reed 3. Movement to is allowed.

The keyboard grip 37 is formed by bending a single sheet metal, and as shown in FIG. 4, a first vertical portion 132 located above and a lower end of the first vertical portion 132. The first horizontal portion 133 bent forward from the first horizontal portion 133, the second vertical portion 134 bent downward from the front end of the first horizontal portion 133, and bent obliquely downward and rearward from the second vertical portion 134 A first inclined portion 135, and a second inclined portion 136 bent obliquely downward and forward from the lower rear end of the first inclined portion 135.
And a third vertical portion 137 bent downward from the lower front end of the second inclined portion 136, and a fourth horizontal portion 138 bent forward from the lower end of the third vertical portion 137. Further, from the upper end of the first vertical portion 132, the pressing portion 139
Is slightly bent forward.

The second vertical portion 134 and the third vertical portion 137
Are on the same vertical plane. The keyboard grip 37 is disposed inside a storage hole 60 that stores a keying device 61 described later, and the second vertical portion 134 and the third vertical portion 137 are brought into contact with the front surface of the storage hole 60. , Fourth horizontal part 1
38 is brought into contact with the bottom surface of the shelf 2. Then, the screw 130 penetrating the second inclined portion 136 is screwed into the front surface of the storage hole 60, and the screw 131 penetrating the fourth horizontal portion 138 is screwed into the bottom surface of the shelf 2, and the keyboard grip is held. E37
Are fixed to the shelf 2.

On the first vertical portion 132, a support member 14 having a rectangular cross section is placed.
Between the vertical portion 132 and the front surface of the storage hole 60. The support member 14 is made of a material that is equal to or slightly softer than the material of the reed 3, such as wood such as spruce or a synthetic resin. Support member 14
Has a length substantially equal to the length of the storage hole 60 (slightly larger than the length of the reed 3) as shown in FIG. , Is in line contact with the upper surface of the support member 14. In the drawing, the support member 14 is used.
Of the reed 3 is almost flush with the upper surface of the shelf 2.
The thickness of the support member 14 is appropriately changed so that the hammer 25 of the hammer action mechanism 20 supported by the hammer 25 has the optimum striking height.

With the keyboard edge 37 fixed to the shelf 2,
The rear end of the reed 6 is inserted between the holding portion 139 above the keyboard grip 37, the shelf board 2 and the support member 14, so that the reed 3 is prevented from moving up and down. A slight gap of about 1 to 2 mm is provided between the pressing portion 139 and the upper surface of the reed 6 to prevent the abrasion of the reed 6 that can move in the lateral direction.

Further, a spacer 140 for facilitating sliding is disposed between the first vertical portion 132 and the rear end face of the reed 6. The spacer 140 is made of a slippery material,
For example, it is formed from polytetrafluoroethylene. Note that the spacer 140 is preferably provided by stacking sheets in order to facilitate the thickness adjustment.

The hammer action mechanism 2 shown in FIG.
0 support rail 21 and shank rail 22
The reed 3 is attached to the reed 3 by a support member (not shown).
The cabstan 24 of the wipen 23 rotatably attached to the support rail 21 is screwed to the key 1. In this manner, the hammer action mechanism 20 can move in the lateral direction together with the reed 3 as described above. Accordingly, when the player steps on the soft pedal as described above, the soft pedal lever 31
Presses the entire reed 3 laterally, and all the keys 1 and the hammer action mechanism 20 also move laterally. As is well known, in a grand piano, one hammer 25 normally hits three strings emitting the same scale, whereas when a soft pedal is depressed in this way, By moving the hammer 25 relatively to the strings, the user strikes only two strings and emits a small sound even if the player presses a key with the same force.

As shown in FIG. 1, behind the hammer action mechanism 20, a damper action mechanism 4 for holding a string is provided.
0 is provided. The damper action mechanism 40 is provided with a damper lever 41 corresponding to each key 1. The damper lever 41 is pushed up by a rear end portion of the key 1 which is depressed, and immediately before the hammer 25 hits a string. ,
The damper moves away from the string. The damper corresponding to the key 1 that is not pressed remains in contact with the strings, so that only the string corresponding to the pressed key 1 emits a sound that can be heard, and the resonance of the other strings is prevented. You. When the player releases the key, the damper lever 41 is lowered,
The damper comes in contact with the strings. When the player steps on the sostenuto pedal, the sostenuto pedal lever 33 is actuated, and the damper corresponding to the key pressed when the sostenuto pedal is depressed is kept away from the strings. Vibration continues. When the player steps on the loud pedal, the loud pedal lever 32 is actuated, and the lifting rail 42 of the damper action mechanism 40 is raised, whereby the damper levers 41 corresponding to all keys 1 are raised. All the dampers move away from the strings. Therefore, when one key 1 is pressed, strings other than the corresponding string resonate and emit a loud sound.

As will be described later, this grand piano is provided with a keying device 61 so that automatic performance can be performed. As described above, a performance by a player is performed in the same manner as a normal grand piano. It has become possible.
In the present embodiment, as described above, the screws 130, 1
By fixing the keyboard grip 37 to the inner surface of the storage hole 60 and the lower surface of the shelf board 2 by the key 31, the keyboard grip 37 above the shelf board 2 in which the keys 1 and the hammer action mechanism 20 are arranged in an intricate manner. Need not be installed. That is, it is very easy to attach the keyboard grip 37.

The bottom of the reed 6 contacts the support member 14 in a straight line along the direction in which the reed 3 can move, so that the movement of the reed 3 on the shelf 2 is hindered. Nothing. Therefore, even when a keyboard instrument in which the reed 3 moves like an existing grand piano is modified and an automatic performance device is manufactured, the movement of the reed 3 similar to the existing keyboard instrument can be ensured. Then, as described above, a plurality of keyboard grips 3
Even if the reeds 7 are provided at an interval from each other, the bottom of the reed 6 does not directly contact the keyboard
Since the reed 4 contacts the reed 4 in a straight line, partial wear does not occur at the bottom of the reed 6. Wear occurs uniformly over the entire length of the reed 6. Therefore, over a long period of time,
The reed 3 can be moved smoothly. In addition, since the bottom of the reed 6 is not supported by the shelf 2 but by the support member 14 held by the keyboard grip 37, the bottom of the reed 6 is formed on the shelf 2 in order to provide a keying device 61 described later. The storage hole 60 to be formed may be formed in a simple shape in advance. The storage hole 6
0 may be formed large in advance. Therefore,
When installing an automatic performance device on an existing keyboard instrument,
Processing and adjustment of the reed 3 and other members above it can be easily performed, and a new keyboard grip 37 and a keying device 61 can be easily disposed. Further, since the thickness of the supporting member 14 is smaller than the thickness of the shelf 2, the supporting member 1
Below 4, the space of the storage hole 60 can be used effectively.

B. Next, the keying device 61 used in the present embodiment will be described. As shown in FIGS. 1 and 2, a storage hole 6 is provided in a portion of the shelf 2 facing the rear end of the key 1.
0 is formed. The storage hole 60 has a long rectangular shape extending over the entire width of the keyboard.
A keying device 61 is incorporated. This keying device 61
Presses the rear end of the key 1 to give the key 1 an operation equivalent to pressing the key, and as shown in FIG.
Support unit (support) 62 detachably fixed to
And a plurality of electromagnetic actuators 63 and 64 mounted on the support unit 62. The electromagnetic actuators 63 and 64 are disposed below the rear end of the keys 1 and drive the corresponding keys 1.

B-1. 4. Support Unit As shown in FIG. 4, the support unit 62 includes a main support plate 70, a side plate (second upright wall) 71 fixed to a bottom wall 70a of the main support plate 70, and an upright wall 70b of the main support plate 70. It has an L metal fitting 72 for connecting the (first standing wall) to the rear part of the shelf 2 and an L metal 73 for connecting the side plate 71 to the front part of the shelf 2. Among them, at least the main support plate 70 is made of a magnetic material such as soft iron. Further, the side plate 71, the L bracket 72, and the L bracket 73 may be formed of soft iron or the like, or may be formed of another metal, resin, or the like if rigidity is ensured.

As shown in FIG. 5, the main support plate 70
Is an L-shaped member having a lateral length substantially equal to the storage hole 60, and having an upright wall 70b and a bottom wall 70a bent at a right angle from the lower end of the upright wall 70b. From both ends of the bottom wall 70a, side walls 70c are provided at right angles. Three rows of through-hole groups 74A, 74B, 74C for mounting the electromagnetic actuator 63 or 64 are formed in the upright wall 70b. Hole group 7
4A, 74B, and 74C, the through hole 74 is
It is a long hole of the same shape and the same size extending in the longitudinal direction of b. In the upper and lower through-hole groups 74A and 74C, the through-holes 74 are arranged in upper and lower two rows, respectively, and in the central through-hole group 74B, the through-holes 74 are arranged in three rows.

In each of the through hole groups 74A, 74B, 74C, the vertically adjacent through holes 74 are staggered by a half pitch and arranged in a staggered manner, and partially overlap in the up and down direction. In addition, adjacent through holes 74 in the same row
Is set substantially equal to the pitch of the general key 1. Further, the lower row of the through holes 74A in the upper through hole group 74A.
The upper row of the through-holes 74B at the center is aligned vertically with the lower row of the through-holes 74B at the center, and
The upper row of the through holes 74 in the lower through hole group 74C are also aligned in the up-down direction.

Further, screw holes 75 are formed at equal intervals in the upright wall 70b of the main support plate 70. Further, a through hole 76 having the same shape and the same size as the through hole 74 is formed in the bottom wall 70a. The through holes 76 are provided for the electromagnetic actuators 63 and 64.
Are arranged at the same pitch as the through holes 74. Further, a plurality of through holes 77 and 78 for screwing are formed in the bottom wall 70a.

As shown in FIG.
Is an elongated member having an L-shaped cross section and substantially the same length as the main support plate 70 extending in the direction perpendicular to the paper surface of FIG. The side plate 71 and the main support plate 70 are fastened by screws 79 passing through a through hole 78 formed in the bottom wall 70a of the main support plate 70.

The L fittings 73 are short members having an L-shaped cross section. A plurality of L fittings 73 are provided in the direction perpendicular to the plane of FIG. One side of the L bracket 73 is fastened to the side plate 71 by screws 80. And
The other side of the L bracket 73 is fixed to the bottom surface of the front part of the shelf 2 via a spacer 82 with a screw 81.

Further, the upright wall 70b of the main support plate 70
, One side of the L fitting 72 abuts, and a screw 83 passing through the L fitting 72 is screwed into a screw hole 75 formed in the upright wall 70b, so that the L fitting 72 and the upright wall 70b are fastened. I have. The L fittings 72 are also short members having an L-shaped cross section, and are provided in plural in the direction perpendicular to the paper surface of FIG. 4 and are spaced from each other. The other side of the L bracket 72 is fixed to the bottom surface of the rear part of the shelf 2 via a spacer 85 with a screw 84.

Thus, the support unit 62 is constituted, and the upright wall 70b of the main support plate 70 is vertically arranged and penetrates the storage hole 60 formed in the shelf plate 2. The front surface of the standing wall 70b is
3, 64 mounting surfaces. Next, the electromagnetic actuators 63 and 64 will be described.

B-2. Electromagnetic actuator The electromagnetic actuators 63 and 64 are, as shown in FIG.
The yoke 90 is made of a magnetic material and forms a magnetic path, a solenoid 100 (electromagnetic driving means) incorporated in the yoke 90, and a plunger 110A or 110B made of a magnetic material inserted into the solenoid 100. I have.

As shown in FIG. 6, the yoke 90 is formed by connecting a first yoke 91 having a crank-shaped cross section and a second yoke 92 having a U-shaped cross section to each other with screws. It has a cross-sectional shape in which flanges 93 are formed at both ends of the shape. The first yoke 91 has a main plate portion 94 erected, a holding plate portion 95 bent horizontally from an upper end of the main plate portion 94, and a flange 93 bent upward from one end of the holding plate portion 95. . The second yoke 92 is provided in parallel with the holding plate 95 of the first yoke 91.
6 and a flange 93 bent downward from one end of the holding plate portion 96
And a coupling piece 97 bent downward from the other end.
The lower portion 94a of the main plate portion 94 of the first yoke 91 has a second
The connecting piece 97 of the yoke 92 is fastened with a screw 99. Then, the holding plate portion 95 of the first yoke 91 and the second
Between the yoke 92 and the holding plate 96 of the solenoid 10
0 is pinched.

First yoke 91 and second yoke 92
Each of the flanges 93 is formed in a trapezoidal shape whose width decreases toward the tip, and a pair of upper and lower screw holes 93a is formed in each flange 93. Further, the lower portion 94a of the main plate portion 94 of the first yoke 91 and the coupling piece 97 of the second yoke 92 are also formed in a trapezoidal shape whose width decreases toward the lower end. Holding plate portion 95 of first yoke 91 and second yoke 92
Is formed in a square shape. The flanges 1 at both ends of the solenoid 100 are provided on the holding plate portions 95 and 96.
A fitting hole 98 is formed to fit the protruding portions 105 and 106 formed on the end surface of the reference numeral 03.

The solenoid 100 has a cylindrical bobbin 102 having a through hole 101, and a coil 104 wound around the outer periphery of the bobbin 102. Flanges 103 are formed at both ends of the bobbin 102. The portion between the flanges 103 of the solenoid 100 is
The flange 103 is arranged in the space between the upper and lower sandwiching plate portions 95 and 96, and is held in a state where both end surfaces of the flange 103 are in contact with the sandwiching plate portions 95 and 96. The fitting holes 98 of the holding plates 95 and 96 of the yoke 90 are formed on the end faces of the flange 103.
Are formed with protrusions 105 and 106 having a circular cross-section to be fitted into. While the upper protrusion 105 has a length that does not protrude from the fitting hole 98, the lower protrusion 10
Reference numeral 6 protrudes from the fitting hole 98 and reaches below the lower end of the lower flange 93. The through hole 101 has a protrusion 105,
106 also penetrates.

In the state shown in FIG. 6, the holding plate 9
5, 96 are parallel to each other, but the solenoid 10
When the first yoke 91 is not disposed between them, the first yoke 91
The angle between the holding plate portion 95 and the main plate portion 94 is made acute, and the holding plate portion 96 of the second yoke 92 and the connecting piece 9 are formed.
The first yoke 91 and the second yoke 92 are formed so that the angle between the first yoke 7 and the upper yoke 7 is obtuse and the interval between the upper and lower flanges 93 is smaller than that shown in the figure. When assembling the electromagnetic actuator 63, the protrusion 1 is inserted into the fitting hole 98.
The first yoke 91 and the second yoke 92 are connected to each other while widening the gap between the flanges 93 in a state where the upper and lower flanges 105 and 106 are fitted and the upper and lower flanges 103 are in contact with the holding plate portions 95 and 96, respectively. Fasten with screws 99. Thereby, the holding plate portion 9
5 and 96 are made parallel to each other, and at the same time, the solenoid 1 disposed between the holding plate portions 95 and 96 in this way.
00 is firmly held by the yoke 90 by receiving an urging force from the holding plate portions 95 and 96.

Now, as shown in FIGS. 4 and 9, the electromagnetic actuators 63 and 64 are arranged in two upper and lower stages. FIG. 7 shows an electromagnetic actuator 64 arranged at the lower stage.
Of the plunger 110B is shown. This plunger 110
Has a cylindrical large diameter member 111 and a cylindrical small diameter member 112 coaxially coupled thereto. The large diameter member 111 is formed of a magnetic material such as soft iron.
The large-diameter member 111 has a screw hole 11 opened on one end surface thereof.
1a is formed, and the large-diameter member 111 and the small-diameter member 112 are joined by screwing a male screw formed at the lower end of the small-diameter member 112 into the screw hole 111a.

At the upper end of the small diameter member 112, two peripheral grooves 112a are formed. Also, the small diameter member 112
A rubber buffering head 113 is attached to the upper end of the head. A stopper 115 is fixed by an E-ring 116 at a portion slightly below the center of the small diameter member 112. The stopper 115 includes a disk-shaped buffer portion 117 made of felt, and a disk-shaped substrate portion 118 to which the buffer portion 117 is fixed.

As shown in FIG. 9, the plunger 110B
The large-diameter member 111 is positioned downward, and the large-diameter member 111 is slidably fitted in the through hole 101 of the bobbin 102 of the solenoid 100. When the buffer portion 117 of the stopper 115 contacts the holding plate portion 95 on the upper side of the yoke 90, the downward movement of the plunger 110B is restricted. Also, the plunger 110
When the movement of B is restricted, the large-diameter member 111 is located in the protrusion 106 formed below the bobbin 102.
The protrusion 106 guides the large-diameter member 111 of the plunger 110B that moves up and down, and prevents the plunger 110B from tilting. The plunger 110A of the electromagnetic actuator 63 disposed in the upper stage has substantially the same configuration, but the plunger 110A has a small-diameter member 112 which is thin and short.
The difference is that the buffer head 113 and the substrate portion 118 of the stopper 115 are connected by a connecting portion 119 having a truncated cone shape.

B-3. Mounting of Electromagnetic Actuators Now, the electromagnetic actuators 63 and 64 are staggered along the longitudinal direction of the main support plate 70 on the front surface of the upright wall 70b of the main support plate 70 of the support unit 62 while alternately changing the vertical arrangement. It is arranged in. As shown in FIG. 2, upper and lower flanges 93 of the yokes 90 of the electromagnetic actuators 63 and 64 are in contact with the upright wall 70 b and are attached thereto by screws 120.

That is, as shown in FIG. 8, the yoke 90 for the upper electromagnetic actuator 63 is
3, a pair of screw holes 93a formed in the lower flange 93 are aligned with upper and lower through holes 74 of the through hole group 74A above the standing wall 70b.
The through holes 74 in the upper row and the middle row of the central through hole group 74B are matched. And the screw 1 passed through each through hole 74
20 is screwed into the screw hole 93a, so that the yoke 9
0 is mounted on the main support plate 70. Although not shown, a yoke 90 for the lower electromagnetic actuator 64 is provided.
Has a pair of screw holes 93a formed in the upper flange 93,
The middle row and lower row of the through-holes 7A at the center of the upright wall 70b.
4 so that a pair of screw holes 93a formed in the lower flange 93 match the upper and lower through holes 74 of the lower through hole group 74C. Then, each through hole 74
The yoke 90 is mounted on the main support plate 70 by screwing the screws 120 passed through the holes into the screw holes 93a.

In this way, as shown in FIG. 9, the electromagnetic actuator 63 is arranged on the upper stage, the electromagnetic actuator 64 is arranged on the lower stage, and the plungers 110
A, 110B are vertical. The upper electromagnetic actuators 63 are arranged at an equal pitch to each other, and the lower electromagnetic actuators 64 are also arranged at an equal pitch to each other. The lower electromagnetic actuator 64 is arranged at a half pitch from the upper electromagnetic actuator 63, and the small-diameter member 112 of the plunger 110 </ b> B of the lower electromagnetic actuator 64 is moved to the upper electromagnetic actuator 6 adjacent to the upper electromagnetic actuator 63.
Extending between three. As described above, the plunger 110A of the upper electromagnetic actuator 63 is short, and the plunger 110B of the lower electromagnetic actuator 64 is long.
All are arranged on the same horizontal plane.

As described above, each of the electromagnetic actuators 63 and 64 is arranged such that the buffer head 113 of the plunger 110A or 110B is directly below the rear end of the key 1. Here, since the yoke 90 is fastened to the main support plate 70 by a screw 120 passing through a long through hole 74 in the lateral direction of the main support plate 70, the screw 120
By loosening, the position of the yoke 90 can be easily finely adjusted in the lateral direction. As described above, the positions of the electromagnetic actuators 63 and 64 can be optimized for various types of grand pianos having different key 1 pitches. Therefore, it is easy to assemble and is very suitable as a retrofit type to an existing piano.

The electromagnetic actuators 63 and 64 are
All the screws 120 that are arranged on the front side of the main support plate 70 and that attach and detach the yokes 90 to and from the main support plate 70 are all operated from the rear side of the main support plate 70. Therefore, attachment / detachment and position adjustment of the yoke 90 are easy. Further, compared with the case where the electromagnetic actuators 63 and 64 are arranged before and after the plate, it is not necessary to increase the width of the storage hole 60 formed in the shelf 2.
Also, after cutting the existing reed 6, the electromagnetic actuator 6 is cut.
Even when spaces are provided for the 3, 64 plungers 110A, 110B, there is an advantage that it is not necessary to cut the post-reed 6 too much.

The main support plate 70 supports each of the electromagnetic actuators 63 and 64 and, since it is made of a magnetic material as described above, forms a magnetic path of each solenoid 101 together with the yoke 90 also made of a magnetic material. I do. When a drive current is supplied to the coil 104 of the solenoid 100, a magnetic field is generated in the solenoid 100 in the vertical direction. The magnetic field circulates around a yoke 90 having a substantially U-shaped magnetic path in front of the solenoid 100 and a yoke 9 behind the solenoid 100.
It circulates through a substantially U-shaped magnetic path composed of the upper and lower clamping plates 95 and 96 and the main support plate 70. Therefore, a rising force is applied to the large diameter members 111 of the plungers 110A and 110B, and the buffer head 113 of the plunger 110 pushes up the rear end of the key 1. As described above, since the solenoid 100 is provided with the magnetic path in the front and the rear,
Plungers 110A and 110B are different from the case where these magnetic paths are not provided or the case where only one yoke 90 is provided.
Can be given a strong lifting power. Moreover, since the rear magnetic path is constituted by the main support plate 70 which is a support for supporting the electromagnetic actuators 63 and 64, the number of components does not increase and the manufacturing cost does not need to be increased.

As shown in FIG. 4, on the upper surface of the bottom wall 70a of the main support plate 70 of the support unit 62, a short side of a bracket 121 having an L-shaped cross section is placed.
A is fastened to the bottom wall 70a by a screw 122 passing through a through hole 77 formed in the bottom wall 70a. This bracket 121
One long member extending over the entire length of the main support plate 70 (in the direction perpendicular to the paper surface of FIG. 4) may be used.
A plurality of short brackets 121 may be provided and provided at intervals in the direction perpendicular to the paper surface of FIG.

A plurality of cylindrical portions 123 project from the long side of the bracket 121. A printed circuit board 124 is in contact with the distal ends of these cylindrical portions 123, and the printed circuit board 124 is fixed to the cylindrical portion 123 by screws (not shown). A circuit for driving the electromagnetic actuators 63 and 64 is provided on the printed board 124.
Lead 1 extending from coil 104 of each solenoid 100
A connector 126 is provided in each of the 25 terminals, and the connector 126 can be attached to the printed circuit board 124. Then, by mounting the connector 126,
A driving current from a circuit provided on the printed circuit board 124 is supplied to the coil 104 of the solenoid 100 through the connector 126 and the lead 125, and the electromagnetic actuators 63 and 64 operate.

The circuit on the printed circuit board 124 is controlled by a control device (not shown). Specifically, the performance data recorded on the recording medium is read by a reading device (not shown), and the control device supplies a control current to the circuit based on the performance data. Then, the circuit of the printed circuit board 124 supplies a drive current to the coil 104 of the solenoid 100 of the electromagnetic actuator 63 or 64 corresponding to the scale to be generated. Then, the plunger 110A
Or 100B rises and pushes up the rear end of the target key 1.

When the supply of the drive current to the solenoid 100 is stopped based on the performance data, the plunger 110 descends and returns to the original position. The plungers 110A, 110 of such electromagnetic actuators 63, 64
By the movement of B, the key 1 is driven and an automatic performance is performed.

The bracket 121 supporting the printed circuit board 124 and the yoke 90 of the lower electromagnetic actuator 64
A cushioning member 127 having a rectangular cross section is arranged between the first yoke 91 and the main plate portion 94. This cushioning material 127
May be fixed to the bracket 121 or the main plate portion 94.
May be fixed. Due to the presence of the cushioning material 127, the bracket 121 can be attached to the bottom wall 70 of the main support plate 70.
When fastening the yoke 90 of the lower electromagnetic actuator 64 at the time of fastening to the a with the screw 122, an excessive force is prevented from being applied. Further, when attaching or detaching the connector 126 to or from the printed circuit board 124, the printed circuit board 124 must be pressed rearward.
7, the yoke 90 of the lower electromagnetic actuator 64
Is prevented from being subjected to excessive force.

In the keying device 61, when the main support plate 70 and the side plate 71 are fastened and the electromagnetic actuators 63 and 64 and the printed circuit board 124 are supported by the main support plate 70 and the side plate 71, the main support plate 70 and the side plate 71 make a substantially J-shaped. Of the housing. That is, the electromagnetic actuators 63 and 64 and the printed circuit board 124 are arranged in the space between the main support plate 70 and the side plate 71. When mounting the keying device 61 on a grand piano, there is a possibility that the keying device 61 may hit another member. However, the electromagnetic actuators 63 and 64 are protected from the impact by the main support plate 70 and the side plate 71. Also,
The main support plate 70 has a flat bottom wall 70a.
Can be placed. Therefore, there is no need to support the keying device 61 so that the operator does not fall down during the mounting operation. For these reasons, the burden of the mounting operation can be reduced.

Here, the housing composed of the main support plate 70 and the side plate 71 is not directly fixed to the shelf plate 2 with screws or the like, but is fixed to the shelf plate 2 via L fittings 72, 73. It has become. Such a housing is used to adjust or replace the electromagnetic actuators 63 and 64, and the shelf 2
May need to be removed from the In such a case, if the housing is directly fixed to the shelf 2, the wooden shelf 2
May damage the product. For example, if the case is fixed with a screw, the thread of the screw hole provided in the shelf plate may be broken by repeated attachment and detachment of the housing. However, as described above, by fixing the housing to the shelf plate 2 via the L bracket, if the housing is removed from the L bracket, the electromagnetic actuators 63 and 64 can be adjusted or replaced. 2 has no adverse effect.

The plungers 110A, 110
The interval between the buffer head 113 and the key 1 is set to an appropriate value (for example, about 0.5 to 1 mm) so that the keying operation by the buffer head 113 of B is performed. This includes
Spacers 82 and 85 having different thicknesses are prepared, and when the keying device 61 is attached to the shelf 2 via the L fittings 72 and 73, the distance between the buffer head 113 and the key 1 is set to the spacer 8.
It may be adjusted at 2,85. Therefore, if the keying device 61 having the same configuration is prepared, accurate keying can be realized even for various types of grand pianos having different sizes of the shelf plate 2 and the reed 3.

As shown in FIG. 9, in the upper electromagnetic actuator 63, the flange 93 below the yoke 90 is formed in a trapezoidal shape whose width decreases toward the lower end. The flange 93 above the yoke 90 is formed in a trapezoidal shape whose width decreases toward the upper end. It is necessary to make the space between the electromagnetic actuators 63 and 64 in the horizontal direction substantially equal to the space between the keys. The lower flange 93 of the yoke 90 of 63 and the upper flange 93 of the lower electromagnetic actuator 64 do not collide. Thereby, the plunger 110
A, the force applied to 110B can be increased. Also, it is easy to incorporate and is very suitable as a retrofit type to existing pianos. In each of the electromagnetic actuators 63 and 64, the upper and lower flanges 93 do not need to have different shapes, and by having the same shape as illustrated, the yokes 90 having the same configuration can be used.

Further, since the lower flange 93 of the electromagnetic actuator 63 and the upper flange 93 of the electromagnetic actuator 64 are formed as described above, the upper electromagnetic actuator 63 and the lower electromagnetic actuator 64 are arranged in the height direction. Can be narrowed. For this reason, the plunger 110 </ b> B of the lower electromagnetic actuator 64 is prevented from being too long, and the occurrence of problems such as vibration and bending can be suppressed. From these, the keying operation is stabilized.

For the same reason, as shown in FIG. 4, the keying device 61 protrudes downward from the storage hole 60, but its length can be reduced. As shown in FIG. 2, a soft pedal lever 31, a loud pedal lever 32, a sostenuto pedal lever 33, and corresponding pedals are arranged below the shelf plate 2.
The length of the keying device 1 projecting downward from the shelf 2 is suppressed, so that the keying device 61 is prevented from buffering with the pedal levers and the pedals. It is easy to attach to 2.

Further, in each yoke 90, the lower portion 94a of the main plate portion 94 of the first yoke 91 and the second yoke 9
Since the width of the second coupling piece 97 is also reduced toward the lower side, even if the electromagnetic actuators 63 and 64 are moved back and forth when attaching / detaching to / from the upright wall 70b, the lower part 94a of the upper electromagnetic actuator 63 and the coupling Piece 97
In addition, the upper collar 93 of the lower electromagnetic actuator 64 is
It is designed not to hit. For this reason, the standing wall 70b
Easy to put on and take off.

C. Modifications The present invention is not limited to the above embodiment, and for example, the following modifications are possible. Each yoke 90 of the electromagnetic actuators 63 and 64 is
Although the first and second yokes 91 and 92 are configured as a combination, they may be a single member. Although the keying device 61 is incorporated in the piano, the present invention can be applied to a so-called boresser type provided on the front end of the key 1. Further, the present invention is not limited to a grand piano, but can be applied to any keyboard instrument such as an upright piano, a harpsichord, a celesta, and an organ.

[0063]

As described above, in the automatic performance device according to the present invention, it is possible to increase the force applied to the plunger without increasing the number of parts.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a main part of a grand piano which is a keyboard instrument provided with an automatic performance device according to an embodiment of the present invention.

FIG. 2 is a plan view showing a shelf plate and a reed of the grand piano.

FIG. 3 is a bottom view showing the shelf before the keying device of the automatic performance device is attached.

FIG. 4 is a side sectional view showing details of the automatic performance device.

5A and 5B are views showing a main support plate used in the automatic performance device, wherein FIG. 5A is a front view, FIG. 5B is a bottom view, and FIG. 5C is a side view.

FIG. 6 is a view showing a yoke and a solenoid of an electromagnetic actuator used in the automatic performance device,
(A) is a plan view, (b) is a side view, (c) is a rear view,
(D) is a bottom view.

FIG. 7 is a partially cutaway front view showing a plunger used in the automatic performance device.

FIG. 8 is a front view of the yoke attached to a main support plate of the automatic performance device.

FIG. 9 is a front view showing an arrangement of the electromagnetic actuator.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 key, 2 shelf, 3 reed, 20 hammer action mechanism, 40 damper action mechanism, 61 keying device, 6
2 ... Support unit (support), 63, 64 ... Electromagnetic actuator, 70 ... Main support plate, 70a ... Bottom wall, 70
b ... standing wall (first standing wall), 71 ... side plate (second standing wall)
Standing wall), 74 ... through-hole, 82, 85 ... spacer, 90 ...
Yoke, 91 ... first yoke, 92 ... second yoke, 9
3 ... tsuba, 100 ... solenoid (electromagnetic drive means), 110
A, 110B: Plunger, 124: Printed circuit board

Claims (3)

[Claims] 1. A plunger, and electromagnetic driving means for moving the plunger in a substantially vertical direction, a plurality of electromagnetic actuators for keying a plurality of keys by the plunger, and the electromagnetic actuator A keyboard supporting the electromagnetic actuator, wherein the electromagnetic driving means of the electromagnetic actuator is mounted on an upper stage and a lower stage of the supporting body, and the support forms a part of a magnetic path of the electromagnetic driving unit. Automatic instrument for musical instruments. 2. The supporting member has an upright wall, and the electromagnetic actuator has a yoke that supports the electromagnetic driving means and forms a magnetic path of the electromagnetic driving means. The yokes are arranged in a staggered manner on the upper and lower tiers on one surface of the standing wall, and each of the yokes has an upper flange and a lower flange mounted on the standing wall, and is mounted on the upper tier. The lower flange of the yoke is narrowed downward, and the upper flange of the yoke mounted on the lower stage is narrowed upward. An automatic performance apparatus for a keyboard instrument according to claim 1. 3. The support has a first standing wall, a flat bottom wall, and a second standing wall facing the first standing wall, and the electromagnetic actuator includes a second standing wall. 2. The automatic musical instrument for a keyboard instrument according to claim 1, wherein the automatic musical instrument is mounted on the inner surface of the first standing wall facing the standing wall.