JPH075874A - Screw driver device for tuning musical instrument - Google Patents

Abstract

PURPOSE:To provide the screw driver device for tuning a musical instrument capable of smoothly transmitting rotation even if rotation is applied in any direction to a screw for tuning of a guitar, drum, etc. CONSTITUTION:On a head part 15 of the device freely rotatably fixed to the device body 20a, a driving wall 15c of a recessed part 15a to be freely fitted with a threaded head part (knob) 2c for tuning symmetrically with a rotating axis C is formed in a projecting or recessed shape formed out of a plane or curved surface, and is formed in a size at which the threaded head part 2c for tuning is movable within the recessed part 15a and the threaded head part (knob) 2c for tuning can co-rotate with the head part 15 of the device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screwdriver device for a musical instrument, which winds a string around a stringed instrument such as a guitar and rotates a tuning screw used when skinning a percussion instrument such as a drum.

[0002]

2. Description of the Related Art A stringed instrument such as a guitar and a contrabass uses a string made of a plurality of metal wires according to the pitch of a pitch. Since it is necessary to apply a large tension to these strings, a worm gear is usually used for the bobbin to be attached to the bobbin. That is, as shown in FIG. 17, the guitar 1
The structure of the bobbin 2 is attached to the bobbin 4 of the rod 3, and the worm wheel 2b is attached to the rod portion 2a around which the string 5 is wound.
This worm wheel 2b is engaged with a worm 2d attached with a butterfly knob 2c, and a string 5 is attached to the tip of the rod portion 2a.
It has a structure in which a slit 2e for hooking is formed.
The slit 2e may be a through hole, for example. Further, the knobs 2c have various shapes and sizes, but all are based on a butterfly screw.

In order to stretch the strings 5 on the guitar 1 shown in FIG. 17, first, one end of the strings 5 is fixed to the body of the guitar 1 (not shown), and the piece 6
It is arranged on the upper side and is wound around the rod portion 2a and fixed. That is, the string 5 is hooked on the slit 2e, and the string 5 is wound and tensioned while rotating the rod portion 2a. Generally, since the rotation ratio of the worm gear is large, in order to attach one string 5 to the guitar 1, it is necessary to rotate the knob 2c many times, and one guitar 1 has four or more spools 2. However, the preparation work is time-consuming.

In order to attach tension to the skin of a percussion instrument such as a drum and attach the skin 8 made of animal hide, synthetic resin or the like to the drum 7, as shown in FIG. Wrap around a cylindrical body 10 and wrap it around the ring 9
Fit the fixing ring 11 onto the body 10 from above the leather 8 wound on the shell, and bolt 12 into the hole 11b formed in the flange 11a of the fixing ring 11.
Insert the bolt 12 into the fixing member 13
Push down the fixing ring 11 by screwing it into a,
Tension the skin 8. Reference numeral 14 shown in FIG. 18 is a screw for fixing the fixing member 13 to the case 10.

To rotate the bolt 12, a cap nut (not shown) with a handle is fitted into the square bolt head 12a, and the bolt 12 is normally rotated by hand. The bolt 12,
That is, a plurality of tuning screws (for example, 8
It is attached, and it is necessary to repeat the simple operation of rotating the cap nut a number of times, which is a labor-intensive operation as in the case of a stringed instrument such as a guitar. The tuning screw structure described above is a snare drum, a tom tom, a bass tom, a small drum, or the like. For bass drums, timpani, etc., bolt-shaped knobs are used as knobs, and they are tightened by hand like a guitar.

[0006]

[Problems to be Solved by the Invention]
Mounting a string on a stringed instrument such as a guitar requires rotating the knob a number of times for one string, which is inefficient, but has not been improved in the past. Similarly, when applying tension to the skin of a percussion instrument such as a drum,
It is necessary to rotate each of the bolts a number of times.

As described above, in order to be able to play a string instrument or a percussion instrument, in addition to the final tuning work performed by the performer himself before the performance, a string or leather is attached to the instrument and the screw is slightly rotated. If this is done, it is necessary to carry out preparatory work to the point where tuning is possible. By the way, it is customary for a player such as a guitar player on the stage to bring several musical instruments to the venue, and when sweat is attached to the strings during performance and the sound quality deteriorates, it is usually replaced with new strings. There is. Therefore, this replacement work is an unexpectedly labor-intensive work, and in general, the performer does not perform the work, and in reality the staff who specializes in the preparatory work is required.

Therefore, if the preparatory work can be performed by a motor-driven tool, the work efficiency is improved,
It is thought that the burden of securing staff will be reduced, which in turn will reduce costs. By the way, there are various kinds of knob shapes of the bobbin, and the tool is not practical unless it fits any kind of knob. Further, even if the knob or bolt to be rotated is engaged with the tool from an arbitrary direction, if the rotation cannot be stably transmitted, it may be impossible to obtain practicality.

A first object of the present invention is to provide a musical instrument tuning screwdriver for use in tuning preparation work for stringing a stringed instrument such as a guitar or covering a percussion instrument. Further, the musical instrument tuning screwdriver device is to provide a musical instrument tuning screwdriver device capable of smoothly transmitting rotation even when applied to a rotary shaft of a knob or a bolt head from a direction in which the rotary shaft intersects. Has an aim.

Another object of the present invention is to provide a musical instrument tuning screwdriver suitable for thumb screw type knobs of various shapes. Another object of the present invention is to provide a musical instrument tuning screwdriver suitable for a square bolt head. Still another object of the present invention is to provide a musical instrument tuning screwdriver device which is driven by an electric motor and is excellent in workability for performing the preparatory work. Another object of the present invention is to provide a musical instrument tuning screwdriver which is lightweight and can be held in any direction with one hand and whose rotational speed and rotational direction can be arbitrarily changed.

[0011]

Means for Solving the Problems A musical instrument tuning screwdriver device according to the present invention for achieving the above object comprises a device for rotating a tuning screw of a stringed instrument or a percussion instrument, which is provided with a rotating means. And a device head rotatably attached to the device body. The device head is provided with a recess into which the tuning screw head is loosely fitted, and the drive wall of the recess. Is symmetrical with respect to the rotation axis, and is formed in a convex or concave shape formed by a flat surface or a curved surface, and the size of the concave portion is adjusted so that the tuning screw head loosely fitted in the concave portion can move in the concave portion. Moreover, when the head of the device is rotated, it is pushed by the drive wall, and the tuning screw is formed so as to rotate together.

The main body of the apparatus may be a dedicated one, or may be, for example, an electric screwdriver having a tool mounting chuck. As described above, tuning screws of musical instruments are roughly classified into flat butterfly screw type screw heads and square bolt heads. The concave drive surface is mainly suitable for rotating a thumbscrew, and the convex drive surface is mainly suitable for driving a square bolt head. Further, in the case of the square bolt head, when the drive wall is formed in a convex shape with a curved surface between the opening side of the recess and the bottom side, the drive wall is formed into a spherical shape. It is suitable when the crossing angle of the rotation axis of the head is large with respect to the rotation axis of the square bolt head.

In order to be able to operate the instrument tuning screwdriver device with one hand, a device for rotating the tuning screw of a string instrument or a percussion instrument, in which the device head is rotatably attached to the tip of the device body, , In the casing of the body,
A reduction gear and an electric motor are mounted in series coaxially with the machine head, the casing is formed so that it can be held by hand, and the rotation of the machine head is controlled by the part that can be operated with the fingers of the hand that grips the rear side of the casing. The operation member may be arranged. The speed reducer can be composed of one or more stages of planetary gears.

The power source of the electric motor may be housed in a casing as a battery, but it becomes large in size and heavy, so that operability is deteriorated. Therefore, if operability is important, the external power supply method may be used, and the power switch of the electric motor may be attached to the instrument tuning screwdriver device main body, and may be appropriately attached, for example, to be operated by a foot.

The rotation speed of the electric motor can be operated even if it is constant, but the variable operation speed improves the operability. Therefore, the rotation speed adjuster of the electric motor can be attached, and the rotation speed adjusting operation member can be arranged in a portion that can be operated by the thumb of the hand holding the rear side of the casing. Further, it is preferable to make the rotation direction of the electric motor variable so that the electric motor can be used not only when the strings and the leather are attached but also when the strings and the leather are removed. Therefore, a rotation direction changeover switch and other operating members can be arranged in the casing.

The screwdriver device for tuning a musical instrument of the present invention can be applied to other musical instruments such as a stringed instrument such as a guitar and a percussion instrument such as a drum as well as a tuning instrument such as a piano and a harpsichord. it can.

[0017]

The means for forming the inner wall surface of the concave portion provided in the head portion of the device to be concave or convex is a means for tuning the musical instrument at a stable position with respect to the knob of the musical instrument tuning screw fitted in the concave portion or the rotation axis of the bolt head. A self-centering action that guides the rotation axis of the screwdriver is obtained. Therefore, upon transmission of rotation, there is no unstable movement of the rotary shaft of the head of the apparatus, and a stable tuning preparation operation can be obtained.

Further, two opposing surfaces of the drive wall are formed in a convex shape with respect to the rotation axis, and the cross section of the drive wall in the rotation axis direction is
The means for forming a spherical driving surface having a convex curved surface in the middle between the opening side and the bottom side of the concave portion is a rotating shaft of the device head with respect to a screw having a square bolt head. As a result, even if the inclination angle of the bolt with respect to the rotation axis is increased, it is possible to stably transmit the rotation.

[0019]

The present invention will be described in detail with reference to the accompanying drawings. Guitar 1 applied to Example 1 described below
Used the one described by FIG. 1 to 6
Shows a portion where the device head 15 of the first embodiment is attached to the drive shaft 16, and the knob 2c of the conventional guitar 1 shown in FIG.
A recess 15a for inserting the
Is inserted into a tip portion 16a having a diameter smaller than that of the drive shaft 16 attached to the apparatus main body 20a, and a pin 17 is planted on the tip portion 16a.
Is exposed to the triangular window 18 opened in the tubular portion 15b, and the apparatus head 15 is pushed by the spring 19 inserted in the tip portion 16a so that the pin 17 is always positioned at the apex 18a of the triangular window 18.

As shown in FIG. 2, the drive wall 15c of the recess 15a is formed as a cylindrical concave surface which is symmetrical with respect to the rotation axis C. The recess 15a is formed in a size that allows a gap to be formed around the knob 2c, and is formed in a size that allows the knob 2c to be easily moved even in the eccentric position in the apparatus head 15. When the device head 15 rotates in the direction of the arrow shown in FIG.
The drive wall 15c pushes the edge e to transmit the rotation. that time,
When the knob 2c is eccentric with respect to the rotation axis C as shown by the chain double-dashed line, the force of the drive wall 15c pushing the left and right edges e becomes imbalanced, causing slippage at the contact portion, and the knob 2c.
A force that causes the rotation axis c of the above to coincide with the rotation axis C of the apparatus head 15, that is, a self-centering action occurs. This self-aligning function is applied to the drive wall.
This is an effect obtained by forming 15c symmetrically with respect to the rotation axis C and in a concave shape, and forming the knob 2c in a size that allows loose fitting in the recess 15.

The pin 17, the triangular window 18 and the spring 19
When inserting the knob 2c into the recess 15a, when the direction of the knob 2c and the direction of the major axis D of the recess 15a are different, the device head 15 rotates to facilitate the insertion. is there. However, it can be omitted when the apparatus main body 20a is driven by an electric motor and is easily held by hand as shown in the third embodiment.

The tuning screwdriver of the first embodiment is not limited to the case where the rotation axis C of the apparatus head 15 and the rotation axis c of the knob 2c are parallel to each other as shown in FIG. Even when it is oblique (angle α), the rotary shaft C is automatically centered at a position where it can rotate without swinging, and the knob 2c can be stably rotated. On the other hand, if the shape of the concave portion 15a is, for example, a rectangular shape, the self-centering action cannot be obtained. Therefore, the rotation axis C of the device head 15 and the rotation axis c of the knob 2c
If you do not match and rotate, the device head 15 will vibrate,
Tuning work cannot be performed stably.

FIG. 7 shows that both the small knob 2c ₁ and the large knob 2c ₂ can be fitted into the recess 15a. Further, the recess 15a may be formed by a straight line as shown by a chain double-dashed line in FIG.
The drive shaft 16 in FIG. 1 may be used by being attached to, for example, an electric drill having a chuck for attaching a drill.

8 to 9 show the bolt 12 of the drum 7 (FIG. 18).
The apparatus head 15 of the second embodiment suitable for rotating the machine will be described. The bolt head 12a has a square shape as shown in FIG.
Recess 15a loosely fitting this, opposing drive walls 15c ₁ .15c ₂
Both are formed symmetrically with respect to the rotation axis C and have a convex shape, and as shown in FIG. 9, the intermediate portion between the opening side and the bottom side of the concave portion 15a is formed with a convex shape with respect to the rotation axis C. and, drive wall 15c ₁ .15c
₂ is spherical.

When the device head 15 shown in FIGS. 8 and 9 rotates,
Bolt head 12a as shown in FIG. 10 is pushed to the driving wall 15c ₁ .15c _2, self-aligning function can be rotated stably acts. Meanwhile in (in other words a cylindrical shape) as shown by the two-dot chain line in FIG. 11 to form a driving wall 15c ₁ .15c _2, the bolt head 12
The range in which the rotation axis C of the device head 15 is inclined with respect to the rotation axis c of a is narrow and cannot be greatly inclined. Therefore, when the drive walls 15c ₁ .15c ₂ are arranged away from the rotation axis C, the bolt head 12a idles. Therefore the second embodiment as shown in FIG. 9 and 11, to form a drive wall 15c ₁ .15c ₂ so that the middle portion of the opening side and the bottom side of the concave portion 15a is convex with respect to the rotation axis C , The operability is improved. However, if the rotation axis C does not greatly incline with respect to the rotation axis c, it does not need to be spherical.

Next, a musical instrument tuning screwdriver 20 according to a third embodiment shown in FIGS. 12 to 14 rotatably supports a device head 15 at its tip, and a rotation speed adjusting lever at the upper part of a split casing 21.
22 and a rotation direction switching operation lever 23,
14) is provided with an insertion hole 24 for a power plug (not shown), and the apparatus head 15 is driven by a DC motor (rotating means) 26 via a speed reducer 25 composed of a planetary gear.

A resin housing 26a is provided with a stepless rotation speed controller and a rotation direction changeover switch (neither shown).
When housed inside, the rotation speed adjusting lever 22 is pivotally supported by a pin 22a, and when pushed in the direction of the white arrow in FIG. 14, the operating end 22b of the rotation speed adjuster is rotated in the direction in which the rotation speed increases, and then released. The rotation speed is reduced by the return spring. The rotation direction selector switch is
A three-stage switch of stop / reverse rotation was used.

The DC motor used in Example 3 has a rated voltage of 12 V and a maximum rotation speed of 14000 to 15000 r.
The speed reducer 25 is configured so that three planetary gears having a reduction ratio of 1: 5 can be connected in series. Reference numeral 28 shown in FIG. 14 is a power connector. A flange-shaped engaging portion 15d is provided in a portion where the device head portion 15 is fitted into the casing 21, is rotatably fitted into a guide groove 21a formed in the casing 21, and the drive shaft 16 of the reduction gear 25 is press-fitted into the boss portion 15e. did. Incidentally, reference numeral 25 shown in FIG.
a is an inner sun gear, 25b is a planetary gear, 25c is an outer sun gear, and 25d is a boss provided to press-fit and attach the drive shaft 16 to the outer sun gear.

In the musical instrument tuning screwdriver 20 of the third embodiment described above, the knob 2c of the bobbin 2 is held by grasping the grip portion 21b and operating the rotation speed adjusting lever 22 and the rotation direction switching operation lever 23 with the thumb. Alternatively, since the rotating direction and the rotating speed of the bolt head 12a can be freely adjusted with one hand, it is possible to perform other necessary work such as holding a string with the free hand. Therefore, a string instrument,
It became possible to efficiently perform the tuning preparation work of the percussion instrument, and it was possible to greatly reduce the work time. The instrument head 15 of the instrument tuning screwdriver 20 of the third embodiment.
Can be detached without disassembling the housing 27, and can be replaced with one for a butterfly type tuning screw and one for a square bolt type tuning screw.

FIGS. 15 and 16 are modifications of FIG. 4, and the recess 15a may be tapered (FIG. 15) or rounded (FIG. 16). Further, it is also preferable to round the corners in the recess 15a so as to make the rotation smooth.

[0031]

As described above, in the musical instrument tuning screwdriver device of the present invention, the inner wall surface of the concave portion formed in the head of the device is formed to be concave or convex in order to fit the tuning screw of the musical instrument.
Rotation of the instrument head is transmitted by the automatic centering action that guides the rotation axis of the instrument tuning screwdriver to a stable position with respect to the knob of the instrument tuning screw or bolt head inserted in the recess. There is no anxiety that the axis swings unsteadily, and stable tuning preparation work can be performed.

Further, the means in which the two opposite surfaces of the drive wall are formed in a convex shape with respect to the rotation axis is for a screw having a small difference between the diagonal line and the side length such as a square bolt head. ,
It is possible to exert the self-centering action of guiding the rotating shaft of the instrument tuning screwdriver to a stable position with respect to the rotating shaft of the bolt head. Furthermore, the cross-sectional shape of the drive wall in the rotation axis direction is
The means for forming a spherical driving surface having a convex curved surface in the middle between the opening side and the bottom side of the concave portion is a rotating shaft of the device head with respect to a screw having a square bolt head. With such a structure, the rotation can be stably transmitted even if the inclination angle of the bolt with respect to the rotation axis is increased.

The musical instrument tuning screwdriver device of the present invention in which the speed reducer and the electric motor accommodated in the main body of the apparatus are arranged coaxially with the head of the apparatus to be attached to the tip end and the main body casing can be held by hand, Since the main body of the device can be formed like a cylindrical flashlight, you can achieve excellent operability with one hand, including switch operation, so hold the instrument or strings with your open hand. Therefore, excellent operability can be obtained, and efficient tuning preparation work can be performed.

[Brief description of drawings]

FIG. 1 is a side view of a head portion of an apparatus according to a first embodiment of the present invention.

FIG. 2 is a plan view of FIG.

3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

5 is a cross-sectional view showing a state in which the knob shown in FIG. 17 is loosely fitted to the head of the apparatus of FIG.

FIG. 6 is a cross-sectional view showing a state in which the rotary shaft of the knob is loosely fitted to the rotary shaft of the apparatus head in FIG.

7 is a plan view showing a state in which knobs having different sizes are loosely fitted to the head of the apparatus shown in FIG.

FIG. 8 is a partially cutaway plan view showing a state in which a square bolt head according to a second embodiment of the present invention is loosely fitted to a device head.

9 is a sectional view taken along the line IX-IX in FIG.

FIG. 10 is a plan view showing a state in which the head portion of the apparatus shown in FIG. 8 rotationally drives a square bolt head, with a part thereof broken away.

11 is a vertical cross-sectional view showing a state in which the head portion of the device shown in FIG. 9 is tilted and loosely fitted into a square bolt head, and is rotationally driven, with a part thereof being cut away.

FIG. 12 is an overall perspective view of a musical instrument tuning screwdriver device according to a third embodiment of the present invention.

FIG. 13 is a plan view of FIG. 12.

14 is a side view of FIG. 12 showing the interior of the instrument tuning screwdriver device shown in FIG. 12 with one housing removed.

FIG. 15 is a vertical cross-sectional view of a modified example of the concave shape shown in FIG. 4 of the first embodiment.

16 is a vertical cross-sectional view of another modified example of the concave shape shown in FIG. 4 of the first embodiment.

FIG. 17 is a perspective view of a main part of a conventional guitar, which is partially cut away and shows a bobbin.

FIG. 18 is a partial cross-sectional view of a conventional drum.

[Explanation of symbols]

1 guitar 2 bobbin 2b worm wheel 2c knob 2c ₁ knob 2c ₂ knob 2d worm (screw) 7 drum 12 bolt 12a bolt head 15 device head 15a recess 15c drive wall 15c ₁ drive wall 15c ₂ drive wall 16 drive shaft 20 instrument Tuning screwdriver 20a Device main body 21 Casing 21b Grip portion 22 Rotation speed tension lever 23 Rotation direction switching operation lever 25 Reducer 25a Inner sun gear 25b Planetary gear 25c Outer sun gear 26 DC motor (rotating means) C Rotating shaft ( C) Rotating shaft (of tuning screw)

Claims (2)

[Claims] 1. A device for rotating a tuning screw of a stringed instrument or a percussion instrument, comprising a device main body equipped with a rotating means and held by hand, and a device head rotatably attached to the device main body. , The head of the device is provided with a recess into which the tuning screw head is loosely fitted, and the drive wall of the recess is formed in a convex or concave shape that is symmetrical with respect to the rotation axis and is formed by a flat surface or a curved surface. Then, the size of the recess is formed so that the tuning screw head that is loosely fitted in the recess can move within the recess, and that the tuning screw can be rotated by the drive wall when the device head rotates. A screwdriver for tuning musical instruments. 2. A device for rotating a tuning screw of a stringed instrument or a percussion instrument, wherein a device head is rotatably attached to a tip end of the device body, and the device head is coaxially decelerated in a casing of the body. 2. A machine and an electric motor are attached in series, a casing is formed so that it can be held by hand, and an operation member for controlling the rotation of the head of the apparatus is arranged in a portion that can be operated by a finger holding the rear side of the casing. A screwdriver device for tuning a musical instrument according to.