JP7350237B2 - capo tasto - Google Patents

Description

The present invention relates to a capo tasto, which is an article used for pitch adjustment when playing a stringed instrument such as a guitar.

A capo tasto is used to press down all the strings of a stringed instrument such as a guitar at desired positions. When a stringed instrument is used to accompany a song, the position of the capo tasto is changed depending on the vocal range of the song or the singer, but it must be operated quickly and without making any noise between songs on stage.

Some conventional capo tastos, for example, use the force of a spring to pinch the neck of a stringed instrument and hold down all the strings. Other types of capo tasto are known, such as those that tighten the capo with grip force and hold it using frictional force (see, for example, Patent Document 1), and those that use leverage (see, for example, Patent Documents 2 and 3). ing.

International Publication No. 2009/115461 International Publication No. 98/49669 Japanese Patent Application Publication No. 2010-145998

However, capotasts that are held in place by springs or friction require strong grip strength when attached. Particularly in the case of a weak player, it is difficult to operate the instrument quickly during intervals between performances. In addition, lever-type devices are easy to operate, but require adjustment in advance to suit the stringed instrument, making it difficult to handle multiple stringed instruments at once.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a capo tasto that can be easily and reliably operated even by a weak player.

In order to solve the above problems, a capo tasto according to a first aspect of the present invention is a capo tasto for fixing on the neck of a stringed instrument, and includes a first arm member and a second arm member capable of holding the neck; A musical instrument receiving part provided on at least one of the first arm member and the second arm member, and an actuator unit that presses the musical instrument receiving part toward the neck when the neck is held between the first arm member and the second arm member. Equipped with.

In the capo tasto according to the second aspect of the present invention, in the first aspect, the second arm member can selectively control a state in which movement in the opening direction in which the second arm member opens relative to the first arm member and a state in which movement is permitted. The apparatus further includes a switching means for switching to.

In the capo tasto according to a third aspect of the present invention, in the second aspect, the second arm member is rotatably attached to the first arm member, and the switching means is configured to be rotatable with respect to the first arm member. The ratchet mechanism restricts the rotation of the second arm member in the opening direction and allows the rotation of the second arm member in the closing direction with respect to the first arm member.

A capo tasto according to a fourth aspect of the present invention is a switch for switching on and off supply of electric power to an actuator unit in any one of the first to third aspects, the capo tasto comprising a first arm member and a second arm member. The apparatus further includes a switch that is turned on when the first arm member and the second arm member are further closed with the neck sandwiched between the arm members.

In the capo tasto according to a fifth aspect of the present invention, in any one of the first to fourth aspects, the actuator unit is an electric actuator that converts rotational motion by the motor into linear motion and presses the musical instrument receiver against the arm. include.

In the capo tasto according to a sixth aspect of the present invention, in any one of the first to fourth aspects, the actuator unit is a fluid actuator that converts motion due to fluid pressure into linear motion and presses the musical instrument receiver against the arm. including.

According to the present invention, after the relative positions of the first arm member and the second arm member are fixed, the instrument receiver can be pressed against the neck of the stringed instrument using the slide mechanism. With this, even a weak player can easily and reliably fix the capo tasto to the neck of a stringed instrument.

FIG. 1 is a side view showing a capo tasto according to a first embodiment of the present invention (open state). FIG. 2 is a side view showing the capo tasto according to the first embodiment of the present invention (closed state). FIG. 3 is a side view showing the capo tasto according to the first embodiment of the present invention (fixed state). FIG. 4 is a block diagram showing a first example of the actuator unit. FIG. 5 is a block diagram showing a second example of the actuator unit. FIG. 6 is a plan view showing the slide mechanism of the musical instrument receiver in the capo tasto according to the second embodiment of the present invention (closed state). FIG. 7 is a plan view showing the sliding mechanism of the musical instrument receiver in the capo tasto according to the second embodiment of the present invention (fixed state). FIG. 8 is a plan view showing a first modification of the slide mechanism of the musical instrument receiver (closed state). FIG. 9 is a plan view showing a first modification of the slide mechanism of the musical instrument receiver (fixed state). FIG. 10 is a plan view showing a second modification of the slide mechanism of the musical instrument receiver (closed state). FIG. 11 is a plan view showing a second modification of the slide mechanism of the musical instrument receiver (fixed state). FIG. 12 is a plan view (partially sectional view) showing the sliding mechanism of the musical instrument receiver in the capo tasto according to the third embodiment of the present invention (closed state). FIG. 13 is a plan view (partially sectional view) showing the slide mechanism of the musical instrument receiver in the capo tasto according to the third embodiment of the present invention (fixed state). FIG. 14 is a side view showing a capo tasto according to a fourth embodiment of the present invention (open state).

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a capo tasto according to the present invention will be described with reference to the accompanying drawings.

[First embodiment]
1 to 3 are side views showing a capo tasto according to a first embodiment of the present invention. In the following description, an XYZ three-dimensional orthogonal coordinate system will be used for convenience. Note that FIG. 1 is an open state, FIG. 2 is a closed state, and FIG. 3 is a fixed state.

As shown in FIGS. 1 to 3, the capo tasto 10 according to the present embodiment includes a first arm member 12 and a second arm member 14 as a pair of arm members capable of holding the neck G of a stringed instrument.

The first arm member 12 includes a musical instrument receiving portion 26 . The musical instrument receiving part 26 is slidable in the left-right direction (±Z direction) in the figure with respect to the first arm member 12.

When holding the neck G of a stringed instrument, the receiving surface 26A of the musical instrument receiving portion 26 comes into contact with the surface G1 of the neck G (the surface on which the strings are arranged). On the other hand, the receiving surface 14A of the second arm member 14 contacts the back surface G2 of the neck G (the surface opposite to the side where the strings are arranged). The receiving surfaces 26A and 14A are made of metal or resin, for example, and may be formed in a shape (for example, concave) that follows the shape of the front surface G1 and back surface G2 of the neck G, respectively. Note that the receiving surfaces 26A and 14A may be replaceable depending on, for example, the type or material of the neck G or strings to be held, or deterioration over time.

The second arm member 14 is rotatably attached to the first arm member 12 via a shaft 16. A torsion coil spring 18 is attached to the shaft 16. The second arm member 14 is biased by a torsion coil spring 18 in a direction away from the first arm member 12 (clockwise in the figure).

The surface of the second arm member 14 around the shaft 16 is formed into a substantially cylindrical shape with the shaft 16 as the center. A plurality of anti-rotation grooves 14B are formed in a partial area of the surface of the second arm member 14 around the axis 16.

A release lever 20 is attached to the first arm member 12. The release lever 20 is rotatable around a shaft 22 attached to the first arm member 12. A torsion coil spring 24 is attached to the shaft 22. The torsion coil spring 24 biases the release lever 20 in the counterclockwise direction in the figure.

A projection 20A that engages with the rotation stopper groove 14B is formed at the lower end of the release lever 20. The protrusion 20A and the rotation stop groove 14B are a ratchet mechanism that allows the second arm member 14 to rotate in one direction relative to the first arm member 12 and disables rotation in the opposite direction about the shaft 16. Configure. Specifically, when the protrusion 20A and the rotation stopper groove 14B are engaged, the direction in which the second arm member 14 opens relative to the first arm member 12 (clockwise direction in the figure; hereinafter, The rotation of the second arm member 14 in the "opening direction" is restricted, and the direction in which the second arm member 14 closes with respect to the first arm member 12 (counterclockwise direction in the figure; hereinafter referred to as "closing direction") is restricted. Rotation of the second arm member 14 in a direction (referred to as "direction") is permitted. On the other hand, when the release lever 20 is operated to release the engagement between the protrusion 20A and the rotation stopper groove 14B, the second arm member 14 opens relative to the first arm member 12. Rotation in direction is possible. In this case, the second arm member 14 opens with respect to the first arm member 12 due to the biasing force in the opening direction by the torsion coil spring 18 without operating the first arm member 12 or the second arm member 14 .

Therefore, when attaching the capo tasto 10 to the neck G, the player should move the second arm member 14 to the first arm while keeping the protrusion 20A and the rotation stopper groove 14B engaged (without operating the release lever 20). Press the member 12 in the closing direction (closing direction). Then, the second arm member 14 is gradually closed by the ratchet mechanism consisting of the protrusion 20A and the rotation stopper groove 14B, resulting in the closed state shown in FIG. 2. At this time, since the rotation of the second arm member 14 in the opening direction with respect to the first arm member 12 is restricted, the operation can be performed smoothly. Thereby, the neck G of the stringed instrument can be sandwiched between the first arm member 12 and the second arm member 14.

When removing the capo tast 10 from the neck G, the player operates the release lever 20 with a finger or the like (pulling it clockwise in the figure) to release the engagement between the protrusion 20A and the rotation stopper groove 14B. Then, the first arm member 12 and the second arm member 14 are brought into the open state due to the biasing force in the opening direction by the torsion coil spring 18 (see FIG. 1). After that, when the player releases his finger from the release lever 20, the protrusion 20A and the rotation stopper groove 14B engage with each other, and the relative position (angle) of the first arm member 12 and the second arm member 14 is maintained in the open state. be done.

The battery 50 supplies driving power to a power source (for example, a motor or a pump, etc., see FIGS. 4 and 5) of the actuator unit 54. The battery 50 can be a primary battery or a secondary battery.

The switch 52 switches on and off the supply of drive power from the battery 50 to the power source of the actuator unit 54 . The switch 52 is a push button type switch, and the button part thereof is arranged to face the protrusion 26B formed on the back surface of the musical instrument receiving part 26. As shown in FIG. 2, when the neck G of the stringed instrument comes into contact with the receiving surface 26A of the musical instrument receiving part 26, the musical instrument receiving part 26 is pushed to the right (-Z direction) in the figure, and the button of the switch 52 is pressed. Switch 52 is turned on. As a result, supply of driving power from the battery 50 to the power source of the actuator unit 54 is started, and the shaft 56 is extended from the actuator unit 54 downward in the figure (in the -Y direction).

Note that in this embodiment, the switch 52 is a push button type switch, but the present invention is not limited to this. For example, it may be a slide switch or the like.

A rack section 58 is attached to the lower end of the shaft 56. The rack portion 58 is a plate-shaped or rod-shaped (eg, prismatic, etc.) member, and its surface 58A is toothed. The rack portion 58 is made of metal, resin, or the like, for example.

The rotary contact piece (cam) 60 is rotatably attached around a shaft 62 attached to the first arm member 12 . The rotating contact piece 60 is made of metal, resin, or the like, for example.

The rotating contact piece 60 includes a generally cylindrical region (pinion portion) 60A centered on the shaft 62 and a convex portion 60B, and has an approximately oval shape as a whole (e.g., ellipse, ellipse, egg shape, etc.). is formed.

The pinion portion 60A is toothed and has a substantially circular gear. The teeth formed on the pinion portion 60A of the rotating contact piece 60 mesh with the teeth formed on the surface 58A of the rack portion 58.

The convex portion 60B has a curved surface that is further away from the shaft 62 than the pinion portion 60A. The rotating contact piece 60 is attached in the initial position shown in FIG. 1 so that the convex portion 60B faces downward (in the -Y direction) in the figure. A fixed contact piece 26C protrudes in the +X direction from the back side of the musical instrument receiving portion 26. The rotating contact piece 60 and the fixed contact piece 26C are arranged so that their positions in the X direction are approximately the same, and the convex portion 60B of the rotating contact piece 60 comes into contact with the fixed contact piece 26C when the rotating contact piece 60 rotates. It is located in

When the switch 52 is turned on and the rack portion 58 moves downward (-Y direction) in the figure, the rotating contact piece 60 rotates clockwise in the figure. As the rotary contact piece 60 rotates, the convex portion 60B comes into contact with the fixed contact piece 26C, and the musical instrument receiving portion 26 is pushed out to the left (+Z direction) in the figure. As a result, as shown in FIG. 3, the neck G of the stringed instrument is held and fixed between the receiving surface 26A of the musical instrument receiving portion 26 and the receiving surface 14A of the second arm member 14.

Here, the switch 52 may be automatically turned off after the actuator unit 54 moves the rack section 58 by a predetermined amount. Further, the switch 52 may be automatically turned off in conjunction with the operation of the release lever 20. The amount of movement of the rack section 58 is determined, for example, by the rotation angle of the rotating contact piece 60 or the force with which the musical instrument receiving section 26 presses against the neck G of the stringed instrument. The force with which the musical instrument receiving portion 26 presses the neck G of the stringed instrument can be determined based on, for example, the load applied to the power source of the actuator unit 54 via the actuator unit 54 and the like.

Note that the convex portion 60B may be attached upward in the figure. In this case, when fixing the neck G of the stringed instrument, it is sufficient to move the rack section 58 in the +Y direction.

Furthermore, in the examples shown in FIGS. 1 to 3, the rotating contact piece 60 and the fixed contact piece 26C are arranged on the +X side of the switch 52, but the present invention is not limited thereto. The rotating contact piece 60 and the fixed contact piece 26C may be arranged on the −X side of the switch 52, or may be arranged in plural sets (for example, one pair on the ±X side of the switch 52). When multiple sets of rotary contact pieces 60 and fixed contact pieces 26C are provided, by expanding the width of the rack portion 58 in the X direction, it is possible to simultaneously rotate the plurality of rotary contact pieces 60 with one actuator unit 54. become.

(First example of actuator unit)
Next, a first example of the actuator unit will be described with reference to FIG. 4. FIG. 4 is a block diagram showing a first example of the actuator unit.

As shown in FIG. 4, the actuator unit 54 includes a motor 64 as a power source and an electric actuator 66.

The motor 64 is, for example, an electric motor, and operates using electric power supplied from the battery 50. Note that the motor 64 may be rotatable in only one direction or may be rotatable in both directions.

The electric actuator 66 converts the rotational motion by the motor 64 into a (reciprocating) linear motion, and moves the shaft 56 in the vertical direction (±Y direction) in the figure. The electric actuator 66 includes, for example, a cylinder and a piston slidably disposed within the cylinder, and converts rotational motion by the motor 64 into (reciprocating) linear motion via a connecting rod attached to the piston. .

In the first example, the rotational driving force of the motor 64 is used to push the shaft 56 downward (in the -Y direction) in FIG. Then, the rack portion 58 is pushed down by the shaft 56, and the rotary contact piece 60 rotates. This makes it possible to securely fix the neck G of the stringed instrument to the capo tast 10.

In the example shown in FIG. 4, the motor 64 may be stopped when the shaft 56 has been extended by the amount necessary to (A) rotate the rotary contact piece 60 by a predetermined angle. Here, the amount of extension of the shaft 56 can be determined from the rotation angle or rotation speed of the motor 64. Note that the predetermined angle is, for example, when the tip of the convex portion 60B (the farthest point from the axis 62 on the outer circumference of the rotary contact piece 60) contacts the fixed contact piece 26C, that is, when the rotary contact piece 60 is at the furthest +Z This is the angle when turning to the side. In the example shown in FIGS. 1 to 3, the predetermined angle is approximately 90°.

(B) When the load applied to the motor 64 via the actuator unit 54 exceeds a threshold value, that is, when the receiving surface 26A of the musical instrument receiving section 26 It may be configured to stop when the force pressing against the receiving surface 14A exceeds a threshold value.

Alternatively, a motor with a brake may be used as the motor 64, and the motor may be stopped by the brake when the above conditions (A) or (B) are satisfied.

Note that in this embodiment, the rotary contact piece 60 is rotated using a rack and pinion mechanism, but the present invention is not limited thereto. For example, the rotating contact piece 60 may be rotated using a worm gear. In this case, a gear (worm) is formed on the rotary contact piece 60, and a helical gear (worm wheel) is formed on the surface of the shaft 56 to mesh with each other. The shaft 56 is then made rotatable by the motor 64. In this case, by rotating the motor (forward or reverse), the rotary contact piece 60 can be rotated around the shaft 62 to switch between the open state in FIG. 1 and the fixed state in FIG. 3.

Note that since the worm gear consisting of a worm and a worm wheel has a self-locking mechanism (automatic tightening), a motor without a brake can be used as the motor 64.

Note that when removing the capo tast 10 from the neck G of a stringed instrument, or when attaching the capo tast 10 to another stringed instrument, the rotating contact piece 60 must be returned to the initial position. In this case, in order to move the shaft 56 upward in the figure (+Y direction), the motor 64 may be further rotated, or the neck G may be rotated in the opposite direction to that when the neck G is fixed.

According to the example shown in FIG. 4, by rotating the rotary contact piece 60 via the actuator unit 54, the motor 64, which is the power source, and the rotary contact piece 60, which is the point of application on which the driving force acts, are separated. Therefore, the degree of freedom in arranging the motor 64 and the like within the capo tasto 10 can be increased. Note that it is also possible to directly rotate the rotary contact piece 60 by the motor 64 without providing the actuator unit 54.

(Second example of actuator unit)
Next, a second example of the actuator unit will be described with reference to FIG. 5. FIG. 5 is a block diagram showing a second example of the actuator unit.

As shown in FIG. 5, the actuator unit 54 includes a pump 80 as a power source and a fluid actuator 82.

Pump 80 supplies fluid (eg, gas (air, etc.), liquid, etc.) to fluid actuator 82 . The fluid actuator 82 includes, for example, a cylinder, and converts motion due to pressure generated by fluid being supplied into the cylinder into a (reciprocating) linear motion.

In the second example, the pressure of the fluid supplied from the pump 80 pushes the shaft 56 downward (in the −Y direction) in FIG. Then, the rack portion 58 is pushed down by the shaft 56, and the rotary contact piece 60 rotates. This makes it possible to securely fix the neck G of the stringed instrument to the capo tast 10.

In addition, when returning the rotary contact piece 60 to the initial position, the fluid may be discharged to the outside of the cylinder and the shaft 56 may be moved upward in the figure (+Y direction).

According to the example shown in FIG. 5, by rotating the rotary contact piece 60 via the actuator unit 54, the pump 80, which is the power source, and the rotary contact piece 60, which is the point of application on which the driving force acts, are separated. Therefore, the degree of freedom in arranging the pump 80 and the like within the capo tasto 10 can be increased.

(Steps for fixing the neck of a stringed instrument to a capo tasto)
Next, a procedure for holding the neck G of a stringed instrument between the capo tasts 10 will be explained.

When the player pulls the release lever 20 clockwise in the figure with a finger or the like, the protrusion 20A moves away from the rotation stopper groove 14B, and the restriction on rotation of the second arm member 14 is released. As a result, the second arm member 14 opens in the direction away from the first arm member 12 due to the biasing force of the torsion coil spring 18, resulting in the open state shown in FIG. 1. When the player releases his finger or the like from the release lever 20, the release lever 20 returns to its original position due to the biasing force of the torsion coil spring 24, and the protrusion 20A engages with the rotation stopper groove 14B again. Thereby, the relative positions (angles) of the first arm member 12 and the second arm member 14 are maintained in the open state.

Next, as shown in FIG. 1, the player places the first arm member 12 of the open capo tasto 10 on the surface G1 of the neck G, and closes the second arm member 14. At this time, the ratchet mechanism consisting of the protrusion 20A and the rotation stopper groove 14B restricts rotation in the opening direction while allowing rotation in the closing direction, so the second arm member 14 can be closed in stages. . This results in the closed state shown in FIG.

2, the surface G1 of the neck G comes into contact with the receiving surface 26A of the musical instrument receiving part 26, and when the musical instrument receiving part 26 moves to the right (-Z direction) in the figure, the musical instrument receiving part 26 The switch 52 is pressed by the protrusion 26B on the back surface. As a result, power supply from the battery 50 to the power source of the actuator unit 54 is started, and the rack section 58 attached to the shaft 56 of the actuator unit 54 moves downward (in the -Y direction) in the figure. As shown in FIG. 3, as the rack part 58 moves, the rotary contact piece 60 rotates clockwise in the figure, and its convex part 60B contacts the fixed contact piece 26C of the musical instrument receiving part 26. The musical instrument receiving portion 26 is pushed out to the left (+Z direction) in the figure. As a result, the neck G of the stringed instrument is held and fixed between the receiving surface 26A of the musical instrument receiving portion 26 and the receiving surface 14A of the second arm member 14.

According to this embodiment, after the relative positions of the first arm member 12 and the second arm member 14 are fixed, the instrument receiving part 26 can be pressed and held against the neck G of the stringed instrument using the rotating contact piece 60. can. Thereby, even a weak player can easily and reliably tighten and fix the neck G of the stringed instrument using the first arm member 12 and the second arm member 14.

In this embodiment, after the relative positions of the first arm member 12 and the second arm member 14 are manually fixed, the power of the motor 64 etc. is used only when tightening the strings, so that the capo tasto 10 operates. It becomes possible to shorten the time.

[Second embodiment]
Next, a second embodiment of the present invention will be described. In the following description, the same components as those in the first embodiment will be given the same reference numerals and the description will be omitted.

This embodiment differs from the first embodiment in the slide mechanism for sliding the musical instrument receiver 26 in the left-right direction (±Z direction) in the figure. 6 and 7 are plan views showing a slide mechanism of a musical instrument receiver in a capo tasto according to a second embodiment of the present invention. Note that FIGS. 6 and 7 correspond to a closed state and a fixed state, respectively.

The slide mechanism 100 according to this embodiment includes link members 102 and 104, a fixed part 106, a slider 108, arms 110A to 110D, and a guide rail 112.

The arms 110A to 110D are rod-shaped members having substantially the same length, and the slide mechanism 100 has a substantially diamond shape.

The fixing part 106 is fixed to the lower end of the shaft 56. Arms 110B and 110D are rotatably attached to the fixed part 106.

A shaft 56 passes through the slider 108, and the slider 108 can slide relative to the shaft 56. Arms 110A and 110C are rotatably attached to the slider 108.

Arms 110A and 110B are rotatably attached to link member 102, and arms 110C and 110D are rotatably attached to link member 104. The positions of the link members 102 and 104 in the XY directions are adjusted so that when the link members 102 and 104 slide in the left-right direction (±Z direction) in the figure, the link member 102 comes into contact with the fixed contact piece 26C of the musical instrument receiver 26. .

The guide rail 112 is, for example, a rail member having a C-shaped cross section. The guide rail 112 has a fixed position in the vertical direction (±Y direction) in the drawing, and is held slidably in the horizontal direction (±Z direction) in the drawing. The tip of the guide rail 112 is fixed to the link member 102. The guide rail 112 is slidably engaged with a protrusion 114 formed on the link member 104. The guide rail 112 restricts the positions of the link members 102 and 104 in the Y direction.

As shown in FIG. 6, in the slide mechanism 100, when the switch 52 is turned on by the protrusion 26B, the shaft 56 is pulled back upward in the figure (+Y direction) by the actuator unit 54. Then, as shown in FIG. 7, the link member 102 moves to the left (+Z direction) in the figure, and the fixed contact piece 26C of the musical instrument receiving part 26 is pushed out. As a result, the neck G of the stringed instrument is held and fixed between the receiving surface 26A of the musical instrument receiving portion 26 and the receiving surface 14A of the second arm member 14.

Also when using the slide mechanism 100 according to this embodiment, the instrument receiving part 26 can be pressed against the neck G of the stringed instrument. Thereby, even a weak player can easily and reliably fix the capo tasto 10 to the neck G of a stringed instrument.

(First modification)
8 and 9 are plan views showing a first modification of the slide mechanism of the musical instrument receiver. Note that FIGS. 8 and 9 correspond to a closed state and a fixed state, respectively.

A slide mechanism 100A according to the first modification is obtained by omitting the link member 104 and the arms 110C and 110D from the slide mechanism 100.

As shown in FIG. 8, in the slide mechanism 100A according to the first modification, when the switch 52 is turned on by the protrusion 26B, the shaft 56 is pulled back upward in the figure (+Y direction) by the actuator unit 54. Then, as shown in FIG. 9, the link member 102 moves to the left (+Z direction) in the figure, and the fixed contact piece 26C of the musical instrument receiver 26 is pushed out. As a result, the neck G of the stringed instrument is held and fixed between the receiving surface 26A of the musical instrument receiving portion 26 and the receiving surface 14A of the second arm member 14.

(Second modification)
10 and 11 are plan views showing a second modification of the slide mechanism of the musical instrument receiver. Note that FIGS. 10 and 11 correspond to a closed state and a fixed state, respectively.

A slide mechanism 100B according to the second modification is obtained by omitting the link member 104, arms 110B, 110C, and 110D from the slide mechanism 100, and providing a link member 116 in place of the slider 108.

The link member 116 is fixed to the lower end of the shaft 56 of the actuator unit 54, and the arm 110A is rotatably attached thereto.

As shown in FIG. 10, in the slide mechanism 100B according to the second modification, when the switch 52 is turned on by the protrusion 26B, the actuator unit 54 moves the shaft 56 downward (in the -Y direction) in the figure. Then, as shown in FIG. 11, the arm 110A moves the link member 102 to the left (+Z direction) in the figure, and the fixed contact piece 26C of the musical instrument receiving part 26 is pushed out. As a result, the neck G of the stringed instrument is held and fixed between the receiving surface 26A of the musical instrument receiving portion 26 and the receiving surface 14A of the second arm member 14.

Note that in the slide mechanisms 100, 100A, and 100B, the link member 102 is arranged on the +X side of the switch 52, but the present invention is not limited thereto. The link members 102 may be arranged on the −X side of the switch 52, or a plurality of link members (for example, a pair on the ±X sides of the switch 52) may be arranged.

Furthermore, the link mechanism for converting the reciprocating linear motion of the shaft 56 of the actuator unit 54 into the sliding direction motion of the musical instrument receiving portion 26 is not limited to the slide mechanisms 100, 100A, and 100B.

[Third embodiment]
Next, a third embodiment of the present invention will be described. In the following description, the same components as those in the first embodiment will be given the same reference numerals and the description will be omitted.

This embodiment differs from the first and second embodiments in the slide mechanism for sliding the musical instrument receiver 26 in the left-right direction (±Z direction) in the figure.

12 and 13 are plan views (partially sectional views) showing a slide mechanism of a musical instrument receiver in a capo tasto according to a third embodiment of the present invention. Note that FIGS. 12 and 13 correspond to a closed state and a fixed state, respectively.

The slide mechanism 100C according to this embodiment includes an extrusion member 150. The push-out member 150 is fixed to the lower end of the shaft 56 of the actuator unit 54.

The extrusion member 150 is a substantially prismatic member extending in the X direction, and the +Z side surface (hereinafter referred to as slope 150A) is formed to have a positive slope in the YZ plane. A first engagement hole 152 and a second engagement hole 154 are formed in the slope 150A in order from the −Z side. The first engagement hole 152 and the second engagement hole 154 can be engaged with an engagement portion 26D that protrudes toward the back side of the musical instrument receiving portion 26 as the push-out member 150 moves.

As shown in FIG. 12, in the initial state, the engaging portion 26D of the musical instrument receiving portion 26 is engaged with the first engaging hole 152. As shown in FIG. 12, when the switch 52 is turned on by the protrusion 26B, the actuator unit 54 moves the shaft 56 downward in the figure (in the -Y direction). Then, as shown in FIG. 13, the push-out member 150 moves downward (-Y direction) in the figure, and the engaging part 26D engages with the second engaging hole 154, so that the musical instrument receiving part 26 moves downward in the figure. Pushed to the left (+Z direction). As a result, the neck G of the stringed instrument is held and fixed between the receiving surface 26A of the musical instrument receiving portion 26 and the receiving surface 14A of the second arm member 14.

In addition, in this embodiment, two engagement holes (the first engagement hole 152 and the second engagement hole 154) were provided in the extrusion member 150, but the number of engagement holes may be three or more. . It is also possible not to provide an engagement hole.

Further, in this embodiment, a male thread may be formed on the surface of the shaft 56 and a female thread may be formed on the extrusion member 150, and a motor for rotating the shaft 56 may be provided in place of the actuator unit 54. In this case, by rotating the shaft 56 (forward rotation or reverse rotation) with the motor, it becomes possible to linearly reciprocate the extrusion member 150 along the ±Y direction.

Furthermore, in the slide mechanism 100C, the engaging portion 26D, the first engaging hole 152, and the second engaging hole 154 are arranged on the +X side of the switch 52, but the present invention is not limited thereto. The engaging portion 26D, the first engaging hole 152, and the second engaging hole 154 may be arranged on the −X side of the switch 52, or a plurality of them (for example, a pair on the ±X side of the switch 52) may be arranged. may have been done.

Further, the slope 150A of the extrusion member 150 may be formed to have a negative slope in the YZ plane. In this case, when the switch 52 is turned on by the protrusion 26B, the actuator unit 54 may pull the shaft 56 back upward in the figure (in the +Y direction).

Further, in the second and third embodiments, the sliding direction of the musical instrument receiving portion 26 is substantially perpendicular to the direction of reciprocating linear motion of the shaft 56 of the actuator unit 54, but the present invention is not limited thereto. The sliding direction of the musical instrument receiving portion 26 and the direction of reciprocating linear movement of the shaft 56 of the actuator unit 54 may be parallel.

Furthermore, the actuator unit 54 is not limited to the mechanism that causes the shaft 56 of each of the embodiments described above to reciprocate and linearly move. For example, the instrument receiving portion 26 may be slid using a piezoelectric element or the like, or the rotary contact piece 60 may be rotated.

[Fourth embodiment]
Next, a fourth embodiment of the present invention will be described. In the following description, the same components as those in the first to third embodiments will be given the same reference numerals and the description will be omitted.

This embodiment differs from the first to third embodiments in the slide mechanism that slides the musical instrument receiver 26 in the left-right direction (±Z direction) in the figure.

FIG. 14 is a side view showing a capo tasto according to a fourth embodiment of the present invention (open state). As shown in FIG. 14, the slide mechanism according to this embodiment includes a pump 90 and a bag body 92 instead of the actuator unit 54.

When the switch 52 is turned on, the pump 90 supplies fluid (for example, gas (air, etc.), liquid, etc.) to the inside of the bag body 92.

The bag body 92 is, for example, a flexible bag-shaped member, and is attached to the inside of the first arm member 12. The bag 92 expands to the left in the figure (+Z direction) when fluid is supplied inside. As a result, the musical instrument receiving portion 26 is pushed out to the left in the figure (+Z direction), and the neck G of the stringed instrument is fixed.

Note that the bag 92 may be formed in a bellows shape so that it expands and contracts in the Z direction and does not expand and contract in the XY directions. In this case, the bag 92 may not have flexibility. Further, the bag 92 may be formed in a shape that follows the back surface of the musical instrument receiving portion 26 (for example, an O-shape surrounding the switch 52), or may be divided into a plurality of bags 92.

The bag body 92 is provided with a valve (not shown) for discharging the internal fluid to the outside. When the release lever 20 is operated, the valve of the bag body 92 is opened and the internal fluid is discharged to the outside. Thereby, the capo tast 10 can be easily removed from the neck G.

In each of the embodiments described above, an example has been described in which the second arm member 14 is rotatably attached to the first arm member 12, but the present invention is not limited thereto. The tightening mechanism including the musical instrument receiving part 26 according to each of the embodiments described above, for example, connects the first arm member and the second arm member with a lead screw (feed screw), and uses an electric drive mechanism such as a motor. It can also be applied to a capo tasto in which the neck is clamped by mutually moving in parallel by driving the lead screw. In this case, the lead screw functions as a switching means for selectively switching between a state in which movement of the second arm member in the opening direction relative to the first arm member is restricted and a state in which movement is permitted.

Further, in each of the above embodiments, the switch 52 is provided on the first arm member 12, but it may be provided on the second arm member 14. Further, in each of the above embodiments, the musical instrument receiving part 26 is provided on the first arm member 12, but it may be provided on the second arm member 14, or on both the first arm member 12 and the second arm member 14. It may be provided.

DESCRIPTION OF SYMBOLS 10... Capo tasto, 12... First arm member, 14... Second arm member, 14A... Receiving surface, 14B... Rotation stopper groove, 16... Shaft, 18... Torsion coil spring, 20... Release lever, 20A... Projection, 22 ...Shaft, 24...Torsion coil spring, 26...Musical instrument receiver, 26A...Receiving surface, 26B...Protrusion, 26C...Fixed contact piece, 26D...Engaging part, 50...Battery, 52...Switch, 54, 54A...Actuator Unit, 56... Shaft, 58... Rack part, 60... Rotating contact piece, 62... Shaft, 64... Motor, 66... Electric actuator, 80... Pump, 82... Fluid actuator, 90... Pump, 92... Bag body, 100, 100A, 100B...Slide mechanism, 102, 104...Link member, 106...Fixing part, 108...Slider, 110A-110D...Arm, 112...Guide rail, 114...Convex part, 116...Link member, 150...Extrusion member

Claims (6)

A capo tasto for fixing on the neck of a stringed instrument,
a first arm member and a second arm member capable of holding the neck;
a musical instrument receiving portion provided on at least one of the first arm member and the second arm member;
an actuator unit that presses the musical instrument receiver toward the neck when the neck is held between the first arm member and the second arm member;
Capotast with. Switching that selectively switches between a state in which movement of the second arm member in an opening direction in which the second arm member opens relative to the first arm member is restricted, and a state in which movement of the second arm member is permitted. The capo tast of claim 1, further comprising means. The second arm member is rotatably attached to the first arm member,
The switching means restricts rotation of the second arm member in an opening direction in which the second arm member opens with respect to the first arm member , and closes the second arm member with respect to the first arm member. The capo tast according to claim 2, further comprising a ratchet mechanism that allows rotation of the second arm member in the closing direction. a switch that turns on and off the supply of power to the actuator unit ;
a mechanism that turns on the switch when the neck is sandwiched between the first arm member and the second arm member;
The capo tasto according to any one of claims 1 to 3, further comprising:. 5. The capo tasto according to claim 1, wherein the actuator unit includes an electric actuator that converts rotational motion by a motor into linear motion and presses the musical instrument receiver against the neck. 5. The capo tasto according to claim 1, wherein the actuator unit includes a fluid actuator that converts motion due to fluid pressure into linear motion and presses the musical instrument receiver against the neck.

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