JPH0782317B2 - Tremolo device for stringed instruments - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a string instrument tremolo device provided in a string instrument such as a steel guitar or an electric guitar.

[0002]

2. Description of the Related Art For stringed instruments such as steel guitars and electric guitars, the tension of a plurality of strings stretched on the main body of the stringed instrument is changed at the same time and uniformly during playing of the instrument. , The pitch of the musical sound being produced is changed at the same time for all strings to create a special sound effect (vibrato effect),
That is, a tremolo device for a stringed instrument for obtaining a so-called tremolo effect is provided. A conventional general string instrument tremolo device is provided with a string bridge that supports and fixes one end of each string stretched on the string instrument body on a tremolo board that is vertically swingably mounted on the string instrument body. ,
By swinging the tremolo board up and down with a tremolo arm (arming operation), the tension of each string whose one end is supported and fixed by a string bridge is changed at the same time and uniformly. However, in such a conventional tremolo device for a stringed instrument, all the strings are large or small in diameter (thickness) in the arming operation of the tremolo substrate.
The same amount of movement (tension or relaxation) regardless of (in this case, the movement of the tremolo board is directly transmitted to the string bridge that supports and fixes one end of each string). Changes are mixed. Therefore, for example, in order to play chords (chords), under the condition that each string is pressed at a predetermined fret position, at the same time, after picking those strings, the tension is applied to each string simultaneously by the arming operation of the tremolo board. When a change is given, the pitch of each musical tone being sounded changes in a disjointed state without any relation between the musical tones, and harmonics (the pitch of each musical tone changes with a certain difference between the musical tones). I couldn't do such an arming performance. Further, in the conventional case, since the movement of the arming operation is uniformly transmitted to all strings, it is not possible to adjust the change in tension of each string, and therefore, the tension of each string is changed in a specific relationship with each other. I couldn't do it either. FIG. 9 shows each string (No.
1 to No. 6) all strings at the same time, and the tension change (tension or relaxation by arming up and arming down) is applied uniformly, the tension change of each string is expressed as the pitch change of the musical tone (frequency). FIG. 10 is a curve graph showing the pitch change of the musical sound in FIG. From each of these figures, when the strings (No. 1 to No. 6) having different wire diameters are moved by the same amount, the pitches (frequency) of the musical tones are different regardless of the musical tones. It can be seen that it changes depending on the state. In FIG. 10, symbols a, b, c, d, e, and f are frequencies of the respective strings (No. 1 to No. 6) when the tremolo board is in a non-arming operation (string tension distance O), that is, open. It shows the frequency of string pitch. Each curve graph has these strings (No. 1-N
It shows that the frequencies a, b, c, d, e and f of o.6) are changed by the arming operation of the tremolo board. The pitch change of each musical tone is harmonic in the relationship of these curves. I know there isn't.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. An object of the present invention is to reduce the tension of each string when the tensions of a plurality of strings having different wire diameters are simultaneously changed. It is an object of the present invention to provide a tremolo device for a stringed instrument that changes while maintaining a specific relationship with each other. Here, the "specific relationship" means that the pitch difference (frequency difference) between the musical tones has a predetermined relationship.

[0004]

In order to achieve the above object, the tremolo device for a stringed instrument of the present invention supports and fixes one end of each string stretched on the main body of the stringed instrument, and the fixed portion of the string is the stringed instrument. A plurality of string support fixing members movable with respect to the main body, and rotatably attached to the string instrument main body,
Arming shafts that rotate by the arming operation, and the arming shafts are arranged corresponding to the respective strings, and the rotational movement of the arming shafts by the arming operation is independently fixed for each of the strings. And a plurality of cams for independently and variably controlling the tension of each of the strings by transmitting the tension to each of the strings of the string supporting and fixing member independently of each other. I am trying.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 show the overall structure of a tremolo device for stringed instruments according to the present invention,
1 is a plan view thereof, FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, and FIG. 3 is a cross-sectional view omitting a part of line III-III of FIG.

In the figure, reference numeral 1 is a steel guitar,
A string instrument body (body) such as an electric guitar, designated by reference numeral 2
Is a tremolo device for a stringed instrument of the present invention provided on the main body 1 of the stringed instrument (hereinafter, simply referred to as a "tremolo device"). On the stringed instrument body 1, a plurality of strings (first
3rd to 8th strings are stretched. Each of these strings 3
One end of each of ~ 8 is supported and fixed to each string support fixing member 15 of the tremolo device 2 described later, and the other end is supported and fixed to each bobbin winding device provided at a neck end (head) not shown.

The stringed instrument main body 1 in the illustrated example is a synthetic resin such as an unsaturated polyester resin as a base and a molding material such as a glass fiber reinforced sheet molding comparand, or a fiber reinforced foam, together with a neck (not shown). Resin material (expanded resin such as epoxy resin, polyester resin, polyimide resin, phenolic resin reinforced with reinforcing fibers such as carbon fiber, pramid fiber, glass fiber and metal fiber) or short carbon fiber Is formed. A space 9 for incorporating a part of the tremolo device 2 is formed in a portion of the stringed instrument body 1 where the tremolo device 2 is provided. The lower end of the space 9 is provided on the lower surface of the stringed instrument body 1 with a plurality of bolts 1
It is closed by a lid 11 which is detachably attached at 0.

The tremolo device 2 includes a tremolo base 13 detachably attached to the upper surface of the string instrument body 1 by a plurality of bolts 12, and the strings 3 to 8 on the tremolo base 13.
A plurality of string length adjusting members 14 slidably attached in the string tension direction (arrows a and b directions), and a string support fixing rotatably attached to each string length adjusting member 14. A member 15, an arming shaft 16 rotatably attached to the tremolo base 13, and a plurality of cams 17 to 22 arranged on the arming shaft 16 corresponding to the strings 3 to 8 respectively.
And is configured.

The tremolo base 13 has a flat plate structure having a rectangular planar shape, and has a plurality of rectangular shapes arranged at predetermined intervals in the longitudinal direction of the central portion thereof so as to correspond to the respective chords 3 to 8. A shaped opening 23 is formed, and a vertical standing portion 24 is formed on the rear end. Such a tremolo base 13 is attached to the string instrument body 1 so that the openings 23 are located on the space 9.

Each chord length adjusting member 14 has a U-shaped frame structure and is placed on each opening 23 of the tremolo base 13. Then, the string length adjusting bolts 26 inserted into the respective horizontal holes 25 of the standing portion 24 of the tremolo base 13 are screwed into the screw holes 28 of the rear wall 27, and when the string length adjusting bolts 26 are turned, the tremolo base The strings (3 to 8) that slide on 13 in the string tension direction (arrows a and b directions) and have one end supported and fixed by the string support fixing member 15 attached to the string length adjusting member 14. The length can be changed. In this case, a coil spring 29 is interposed between the standing wall 24 and the rear wall 27 of the string length adjusting bolt 26.
As a result, the string length adjusting member 14 smoothly slides on the tremolo base 13 without rattling. A pickup accommodating portion 31 for accommodating the magnetic pickup 30 is integrally provided at the front end of the string length adjusting member 14.

Each string support fixing member 15 is a string length adjusting member 1.
4 includes a string support member 32 rotatably attached to the string support member 4 and a string fixing member 33 integrally connected to the string support member 32. The string support member 32 winds and supports one end 34 of the string. At the same time, the string fixing member 33 presses and fixes one end 34 of the string to the string supporting member 32. The string support member 32 is fixed to a support shaft 37 that is rotatably bridged between both side walls 35 and 36 of the string length adjusting member 14, and has a substantially circular shape. In this case, the flat surface portion 3 for preventing the string from slipping when the one end 34 of the string is wound around the outer peripheral surface of the string supporting member 32 and stabilizing the winding of the string.
8, 39 are provided. The string fixing member 33 holds the string supporting member 32 in a state of being sandwiched between the string supporting member 32 and the tip of the string fixing bolt 42 screwed into the screw hole 41a of the rear wall 41 of the U-shaped member 40 and the string supporting member 32. The one end 34 of the string is a plate-shaped member interposed between the one end 34 of the string and the one end 34 of the string that is wound around the outer peripheral surface of the string supporting member 32, and the string fixing bolt 42 is rotated and tightened. Support member 3
The second flat portion 39 is pressed and fixed. In this case, one end 34 of the string is firmly fixed to the flat surface portion 39 of the string supporting member 32 by the pressing force of the string fixing member 33, but at the same time, is prevented from coming off by the ball end 44.

The arming shaft 16 is rotated by the swing of the tremolo arm 45 according to the swing amount, and the movement of the tremolo arm 45 is moved to each string support fixing member 15 by each cam 1 described later.
7 to 22 for transmission. The arming shaft 16 is rotatably attached to hanging walls 46 and 47 integrally formed on both sides of the lower surface of the tremolo base 13, and has balance springs 48 and 49 formed of torsion springs on both sides thereof. Each balance spring 48,
Numeral 49 is a boss portion 52, 5 fitted and fixed to a portion 50, 51 protruding outside the hanging wall 46, 47 of the arming shaft 16.
3 is wound around, and the wound part is fixed to the bosses 52 and 53, and both ends 54 and 54 are fixed to the string instrument body 1. In this case, the tremolo arm 45 is screwed into the outer peripheral surface of the one boss portion 52 via the notch portion 55 formed in the stringed instrument body 1. When the tremolo arm 45 is swung in the up-and-down direction (arrow c and d directions), the arming shaft 16 is swung according to the swing amount as described above. In this case, the tremolo arm 45 is held in the non-arming position by the balance springs 48 and 49 in the returning state as shown in FIG. 2, and when the tremolo arm 45 in this state is vertically swung. , The arming shaft 16 has balance springs 48, 4
It turns against 9. The balance springs 48 and 49 may be replaced with coil springs or the like interposed between the arming shaft 16 and the string instrument body 1.

The cams 17 to 22 arranged at the positions corresponding to the chords 3 to 8 on the arming shaft 16 are tangential cams having the same minimum diameter and different maximum diameters. The arming shaft 16 is formed separately from the above and is fitted into the arming shaft 16 through its shaft hole 56, and is prevented from rotating by a key 57. In this case, the spacing collar 43 is interposed between the cams 17 to 22. Each of the cams 17 to 22 may be formed integrally with the arming shaft 16, but when formed separately as illustrated, they can be changed to different cams. Each of these cams 17
Numerals 22 to 22 are for transmitting the rotational movement of the arming shaft 16 to the respective string support fixing members 15 via the string fixing bolts 42 as described above, and the wire diameters of the corresponding strings 3 to 8 are large and small ( The maximum diameter varies depending on the thickness).
Here, the maximum diameter is increased so that the transmission amount increases as the wire diameter corresponds to a thicker string. At the same time, the ratio of the maximum diameters is determined so that the transmission amount is proportional between the cams 17 to 22. For example, when the minimum diameter (D ₁ ) of each of the cams 17 to 22 is 30 mm, the maximum diameter (D ₂ ) of the cam 17 corresponding to the first string 3 having the smallest wire diameter is 33 mm and the second string. The maximum diameter (D ₂ ) of the cam 18 corresponding to 4 is 3
The maximum diameter (D ₂ ) of the cam 19 corresponding to the third string 5 is 4.5 mm, and the maximum diameter (D ₂ ) of the cam 19 is 35.4 mm.
Maximum diameter of (D ₂₎ is a 36 mm, maximum diameter of the cam 21 corresponding to the fifth string 7 (D ₂₎ is a 36.9Mm, the cam 22 corresponding to the sixth string 8 with the largest wire diameter Maximum diameter (D ₂ )
Is 37.5 mm. FIG. 4 shows the first string 3 having the smallest wire diameter.
And the cam 17 corresponding to the third string 5
And a cam 22 corresponding to the sixth chord 8 having the largest wire diameter. In FIG. 4, the positions indicated by the solid lines of the cams 17, 19, and 22 are the positions when the arming is not performed (cam rotation angle O), and the imaginary lines

[Outer 1] The position indicated by is the maximum arming up position, and the imaginary line

[Outside 2] The position indicated by is the position at maximum arming down. In this case, the angular positions of the cams 17, 19 and 22 in the non-armed state are different because the respective string support fixing members 15 are in the set state, that is, the inclination angles of the string fixing bolts 42 are the same. When the string fixing bolts 42 of the respective string support fixing members 15 are at the illustrated inclination angles, the strings 3 to 8 are
The tension is adjusted by a bobbin winding device (not shown) and the tension is set so that a predetermined open string pitch is produced. The string fixing bolts 42 of each string support fixing member 15 are connected to the respective cams 17,
19 and 22 are imaginary lines

When arming up like [Outside 1], the imaginary line centering on the support shaft 37

[Outside 3] The cams 17, 19 and 22 are rotated to the position of

An imaginary line centered on the support shaft 37 when the arming down is maximum as in [Outer 2]

[Outside 4] Rotate to the position. As described above, since the maximum diameters (D ₂ ) of the cams 17 to 22 are different from each other, the transmission amount of the rotational movement of the arming shaft 16 to the respective string support fixing members 15 is different, and the maximum diameters (D ₂ ) Smallest cam 1 of
7 has the smallest transmission amount, and the cam 22 having the largest maximum diameter (D ₂ ) has the largest transmission amount.

In the tremolo device of the present invention constructed as described above, when the tremolo arm 45 is swung in the vertical direction (directions of arrows c and d), the arming shaft 16 is shown in FIG. 4 in accordance with the amount of swing. The cams 17 to 2 that rotate (arrows e and f directions) as shown in FIG.
2 is independently transmitted to each string support fixing member 15 that supports and fixes one end 34 of each string 3 to 8. The transmission of this rotational movement causes each string support fixing member 15 to rotate about the spindle 37 (arrow g, h direction), and the strings 3 to 8 are tensioned (arrow b direction) according to the amount of rotation. Or relax (direction of arrow a). As a result, the pitch of each musical tone being sounded is changed at the same time for all strings. In this case, since the rotational movement of the arming shaft 16 is independently transmitted to each string support fixing member 15 by each cam 17 to 22, by appropriately changing the transmission amount by each cam 17 to 22,
The tensions of the strings 3 to 8 can be changed in a specific relationship with each other, and when the transmission amount of each of the cams 17 to 22 is set to be larger for a string having a larger wire diameter as illustrated, The pitch of the musical tones changes with a certain difference between the musical tones, which enables a harmonic arming performance.

FIG. 5 shows the pitch change of each musical tone corresponding to the turning angle of each cam 17-22 in the arming operation of the tremolo device for a stringed instrument of the above-described embodiment, in numerical value (frequency). Is a curve graph showing the pitch change of each tone in FIG. From each of these figures, if the maximum diameter (D ₂ ) of each cam 17 to 22 is changed according to the size (thickness) of the wire diameter of each string 3 to 8, the pitch (frequency) of each musical sound is between each musical sound. It can be seen that changes with a certain difference. In FIG. 6, symbols a, b, c, d, e, and f are open strings 3 to 8 (No. 1) when the arming shaft 16 is in a non-arming operation (cam rotation angle O). ~ N
o.6) shows the frequency of the generated musical sound obtained by picking, that is, the frequency of the open string pitch. Each curve graph shows the frequencies a, b, c, d of these strings 3-8.
e and f show the state of changing by the arming operation of the arming axis 16, and the pitch change of each musical sound is parallel to each other based on the pitch of each musical sound obtained in the non-arming operation described above from the relationship of these curves. It is understood that the pitch changes of the musical tones are in a harmonic relationship because of the change in the frequency relationship.

In the above embodiment, the outer diameter of each of the cams 17 to 22 is based on the pitch (frequency) obtained when the fourth string is picked, and the pitch of each of the other musical tones is different. Although the case where the pitch is set to change with a constant frequency relation is shown, the pitch of another string may be set to change with reference to the pitch of a string other than the fourth string. It is also possible to set such that only the pitches of the musical tones relating to some strings change with a predetermined difference from the musical tones relating to specific strings. For example, among the cams 17 to 22, it is also possible to appropriately control only the pitch change of the musical sound of some strings by appropriately changing the outer diameter shape of some of the cams.

FIG. 7 shows another embodiment of the cam for transmitting the rotational movement of the arming shaft 16 to each string support fixing member 15. Here, the cam 17 'corresponding to the first string 3 and the cam 19' corresponding to the third string 5 having the smallest wire diameter.
And a cam 22 'corresponding to the sixth string 8 having the largest wire diameter.
And are typically shown. Also in this case, each cam 17 ', 1
9'and 22 'are tangential cams, each with a minimum diameter (D
₁ ) and the maximum diameter (D ₂ ) are different. put it here,
Each cam 17 ', 19', 22 'is a small cam as those corresponding to the large chord diameter minimum diameter (D _1), and the minimum diameter (D ₁₎ and the maximum diameter of (D ₂₎ The ratio is a big cam. In the illustrated case, each cam 17 ',
19 'and 22' are attached to the arming shaft 16 at the same angle. The position indicated by the solid line is the position when not arming (cam rotation angle O), and is the imaginary line

The position shown in [Outer 1] is the position at maximum arming up, and the imaginary line

The position shown in [Outer 2] is the position at the time of maximum arming down. Therefore, each cam 17 ', 1 in the solid line position
The inclination angles of the string fixing bolts 42 of the respective string support fixing members 15 contacting 9'and 22 'are different, and the strings 3, 5 and 8 are stretched so that a predetermined open string pitch is produced at these positions. It is set up. As for each string fixing bolt 42, each cam 17 ', 19', 22 'is an imaginary line

When arming up like [Outside 1], the imaginary line centering on the support shaft 37

The cams 17 ', 19', 2 are rotated to the [outer 3] position.
2'is the imaginary line

An imaginary line centered on the support shaft 37 when the arming down is maximum as in [Outer 2]

Rotate to the [outer 4] position.

Even when such cams 17 ', 19' and 22 'are used, the same operation as that of the above-mentioned cams 17 to 22 can be obtained, and the strings 3 to 8 are adapted to the size of the wire diameter. The tension will be changed.

FIGS. 8A and 8B show still another embodiment of the cam for transmitting the rotational movement of the arming shaft 16 to each string supporting and fixing member 15. The cam 58 shown in FIG. 8A is a circular cam, and the cam 5 shown in FIG.
9 is an oval cam. When these cams 58 and 59 are used, the eccentricity of each of the strings 3 to 8 is changed according to the size of the wire diameter of the strings 3 to 8, and the string having a large wire diameter is used for performing a harmonic arming performance. The eccentricity amount is set to be larger for the cam (here, the cam corresponding to the sixth string 8 is shown). The positions indicated by the solid lines on the cams 58 and 59 are the positions when the arming is not performed (cam rotation angle O).

The position shown in [Outer 1] is the position at maximum arming up, and the imaginary line

The position shown in [Outer 2] is the position at the time of maximum arming down. And each cam 58, 59 is an imaginary line

When arming up as shown in [Outer 1], the string fixing bolt 42 is drawn along the imaginary line around the spindle 37.

Rotate to the [Outside 3] position and draw the imaginary line

When the arming is down to the maximum as in [Outer 2], the string fixing bolt 42 is drawn around the support shaft 37 in an imaginary line.

Rotate to the [outer 4] position.

When using each of these cams 58 and 59, the same operation as when using the above-mentioned cams 17 to 22 is obtained,
The tension of each of the strings 3 to 8 is changed according to the wire diameter.

[0021]

As described above, the tremolo device for a stringed instrument of the present invention supports and fixes one end of each string stretched on the main body of the stringed instrument, and the fixed portion of the string is the stringed instrument. A plurality of string support fixing members that are movable with respect to the main body, an arming shaft that is rotatably attached to the main body of the stringed instrument, and that rotates by an arming operation, and that correspond to the strings on the arming shaft. Arranged to transmit the rotational movement of the arming shaft by the arming operation to each of the string support fixing members independently for each of the strings,
Since a plurality of cams that independently and variably control the tension of each string by independently moving the fixing portion of each string of each string supporting and fixing member are provided, the tension of each string can be adjusted. When the pitches of the musical tones being generated are changed at the same time and all the strings are changed at the same time, it is possible to independently and variably control the change in tension depending on the size of the wire diameter for each string. Therefore, for example, it is possible to perform a harmonic arming performance in which the pitch of each musical tone being sounded is changed with a certain difference between the musical tones.

[Brief description of drawings]

FIG. 1 is a plan view showing a tremolo device for a stringed instrument according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view with a part omitted along line III-III in FIG.

FIG. 4 is an enlarged cross-sectional view showing main parts corresponding to the first, third and sixth strings of the tremolo device for a stringed instrument.

FIG. 5 is a diagram showing a numerical value (frequency) of a pitch change of each musical sound corresponding to a turning angle at the time of an arming operation of each cam of the tremolo device for a stringed instrument.

FIG. 6 is a graph showing a pitch change of each musical sound in FIG.

FIG. 7 is a sectional view showing another embodiment of each cam of the tremolo device for a stringed instrument.

8A and 8B are sectional views showing still another embodiment of each cam of the tremolo device.

FIG. 9 is a diagram showing a change in tension of each string of a conventional tremolo device for a stringed musical instrument as a numerical value (frequency) as a pitch change of a musical sound.

FIG. 10 is a graph showing a change in pitch of the musical sound in FIG. 9 with a curve graph.

[Explanation of symbols]

 1 stringed instrument body 2 tremolo device for stringed instrument 3 to 8 strings 14 string length adjusting member 15 string support fixing member 16 arming shaft 17 to 22 cam 32 string supporting member 33 string fixing member 34 string end 42 string fixing bolt 45 tremolo arm 48, 49 balance spring

Claims (12)

[Claims] 1. A tremolo for a stringed instrument in which the tension of a plurality of strings stretched on the main body of a stringed instrument is changed simultaneously by a tremolo operator capable of arming operation to change the pitch of a musical tone being generated simultaneously for all strings. In the device, a plurality of string support fixing members that support and fix one end of each string stretched on the string instrument body, and a fixing portion of the string is movable with respect to the string instrument body, An arming shaft that is rotatably attached to the main body of the stringed instrument and that rotates by an arming operation of the tremolo operator, and an arming shaft that is arranged on the arming shaft in correspondence with each of the strings and that of the arming shaft by the arming operation. Rotational movement is transmitted to each of the string supporting and fixing members by an amount of transmission that is independent of each of the strings, and the fixing portion of each of the strings of the string supporting and fixing member is independently moved. By, stringed instrument tremolo device comprising a plurality of cams, further comprising a variably controlling the tension of each string independently. 2. Each of the string support fixing members is a substantially circular string support member rotatably attached to the string instrument body, and one end of a string wound around the outer peripheral surface of the string support member is string fixed. The tremolo device for a stringed instrument according to claim (1), comprising a plate-shaped string fixing member that is pressed and fixed to the outer peripheral surface of the string supporting member by a tightening force of a bolt. 3. The string supporting member is attached to a string length adjusting member that is mounted on the main body of the string instrument so as to be movable in a corresponding string tension direction.
A tremolo device for a stringed instrument according to the item (2). 4. The tremolo operator is attached to one end of the arming shaft.
A tremolo device for a stringed instrument according to the item (1). 5. The cams contact the string fixing bolts of the string supporting and fixing members, and transmit the rotary motion of the arming shaft to the string supporting members of the string supporting and fixing members via the string fixing bolts. The tremolo device for a stringed instrument according to claim (2) or (3). 6. The outer diameter shape of each cam is set such that the larger the wire diameter of the corresponding chord, the larger the amount of transmitting the rotational movement of the arming shaft to the chord supporting and fixing member. A tremolo device for a stringed instrument according to claim (1). 7. The string instrument according to claim 6, wherein the cams are tangential cams having the same minimum diameter and different maximum diameters according to the wire diameter of the corresponding string. Tremolo device. 8. The tremolo device for a stringed instrument according to claim 6, wherein each of the cams is a tangential cam having a minimum diameter and a maximum diameter that differ according to the wire diameter of the corresponding string. 9. The maximum diameter portion of each of the cams comes into contact with each of the string support fixing members at the time of maximum arming up,
The minimum diameter portion comes into contact with each of the string support fixing portions at the time of maximum arming down.
A tremolo device for a stringed instrument according to item (7) or (8). 10. The tremolo device for a stringed instrument according to claim 6, wherein each of the cams is an eccentric cam having a different eccentricity according to a wire diameter of a corresponding string. 11. A balance spring is attached to the arming shaft to urge each of the cams arranged on the arming shaft to an initial position against the tension of the strings. A tremolo device for a stringed instrument according to item (1). 12. When the respective cams are set to the initial positions by the balance springs, the respective strings supported and fixed by the respective string supporting and fixing members emit a predetermined open string pitch. The tremolo device for a stringed instrument according to claim 11, wherein the tremolo device is stretched in a tension state.