JPH0242236B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a harp, in which a string is stretched between an upper arm called a neck and a resonator, and the length of the vibrating part of the string is divided into several sets. It belongs to the type that can be adjusted using a string member. The string member is mainly actuated by a double-acting mechanism to press the string, and the mechanism is built into the neck and connected to a pedal provided on the base of the harp. ing.

The pedal-equipped harp is an important instrument, especially in the field of chamber music. In the model currently in use, 38 to 48 strings of different lengths are placed between the net and a resonator (fixed to the resonator box) that is tilted at approximately 45 degrees to the strings. It is stretched. It also has an upright front post, which is connected to a base with a pedal, to which a resonance box is connected, and which is connected to the neck at the tail of the harp. Can be combined. Known triangular harps of the above construction, whether single-acting or double-acting, have one or two rows of two-legged string members; Each of the members is arranged in a positional relationship such that the string passes between its legs, and performs a string pushing action by holding the string between the legs. In other words, the length of the string is 18
By pressing the strings at 1/2 the length and making them shorter,
It has the effect of raising the pitch one semitone at a time, from the odd tones to the normal tones, and then from the normal to the tones.

A conventional harp of this type is provided with seven pedals corresponding to C to C of the musical scale, and these pedals are used to raise the pitch of each string by a semitone or a whole tone. To this end, these pedals have three positions corresponding respectively to a modified tone, a normal tone, and a detonation, and actuate the above-mentioned pedal member via a transmission mechanism. This transmission mechanism consists of a rod installed in the front column, the lower end of this rod is connected to the pedal, and the upper end is connected to the pedal.
It is connected to a cam unit that swings around a rotation axis. The cam unit is connected to the suspension member by bars or levers, rivets, and chains.

It has been found that the above structure has the following drawbacks.

That is, in this structure, the above rod,
In addition, the levers or bars installed in the net are designed to perform "push" and "pull" actions alternately, and as a result, the rods and levers buckle and deform due to the pushing force. , undesirable vibrations will occur. In addition, as the rivet changes its position within the rivet hole, it makes a clicking noise every time it moves, and to eliminate this it is necessary to retighten the rivet, which is a tedious and time-consuming process. It is.

Additionally, cams and levers are parts that require high precision, and delicate adjustments must be made by hand for each individual product, which increases the cost of the harp accordingly.

In addition, this type of conventionally constructed harp
Because it has a complex structure with more than 350 parts, it is extremely time-consuming to manufacture.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of conventional harps of this type, reduce the number of parts, lower the cost of the harp, and, in particular, improve the playing experience for the player by eliminating noise. The objective is to provide a harp with good comfort.

According to the present invention, the above object is achieved as follows. That is, seven operating mechanisms for the string members are provided, one for each of the notes C to C of the musical scale, and each of these operating mechanisms consists of a double-acting transmission. This transmission device is 1
It consists of a book swing bar, the upper end of which is connected by a first flexible tension cable to a first set of upper lever members. These first string members serve as pressing elements for raising the original tone by a semitone from the altered tone. The rocker bar is also in sliding contact with a cam disk, and a pulley integral with the cam disk has a second tension cable, also flexible, wrapped in a non-slip manner. This second
The cable is connected to the lower second string member group and is also connected to the control pedal. The second string member is a string element for obtaining a banging sound.

According to one preferred embodiment of the present invention, the cables are connected by installing tension coil springs on the upper and lower cables, respectively, with one end fixed to the tail of the harp and the other end connected to the end of the cable. The aim is to maintain the tensile strength of the material.

As is easily understood, the operation of the transmission system according to the invention is always limited to a "pull" operation only. There is no alternating "push" and "pull" action as in the conventional case, and the operation is therefore silent.

According to the invention, a strain compensation device for the second cable is provided, which device causes the second cable to form a bend when at rest. Further, the length of this curved portion is made to correspond to the length of the circumference of the circular boss of the cam disk, that is, the pulley portion, and as the boss rotates, the curved portion is expanded and becomes a straight line.

Furthermore, according to a preferred embodiment of the present invention:
The upper and lower string members are each secured to the first and second cables at mutually equal angles with respect to the string. Further, the cam has a shape having two straight sides extending in the tangential direction of the boss and an arcuate side at the outermost end. In the above structure, when the transmission mechanism is in a rest state, the string member does not press the string, and therefore the string is in the lowest pitch state, that is, the string is in a state of varying tone. In this state, if you step on the pedal and turn the cam disk a quarter turn,
The second cable stretches and straightens, but not before the lower second peg member is actuated. On the other hand, the upper first cable is pulled under the action of the cam and the rocker bar to actuate the first string member. As a result, the length of the string is shortened by one-eighteenth of the length of the vibrating part of the string, resulting in a sound that is a semitone higher than the modified note, that is, the original note. From this state, press the pedal further and turn the cam disc another quarter turn.
This time, the second cable is further pulled, and the lower second string member is actuated to perform a string pushing action.
By further shortening the string length by one-eighteenth of the vibrating part, the result is a semitone higher, that is, a yelp sound. In this state, the support arm of the first string member and the support arm of the second string member are in a mutually parallel positional relationship. Note that while the second lever member is operated, the swing bar remains in the same position as it continues to be in sliding contact with the arcuate side of the tip of the cam, so there is no excess contact with the upper first cable. No tensile force is applied.

Because of the construction described above, each transmission system requires a much smaller number of components than conventional versions. In addition, levers, rods, and rivets are no longer required, and are replaced by just one cam and one rocker bar, which greatly reduces assembly and adjustment problems. This will naturally reduce the cost.

The following will be explained with reference to the drawings. In the harp shown in FIG. 1, reference numeral 1 indicates a string, 2 indicates an upper neck, and 3 indicates a resonance board fixed to a resonance box 4. The neck 2 is connected to a base 5 via a front pillar 6, and a resonance board 3 and a resonance box 4 are fixed to the base 5. In FIG. 1, only one operating mechanism of the upper and lower string members 7 and 8 and one pedal 9 connected thereto are shown. However, in reality, seven of these are provided, corresponding to each of the musical scales C to B. Furthermore, the pedal 9 has three positions corresponding to the flattened tone, the standard tone, and the folded tone, but in the figure, it is in the highest position (corresponding to the lowest pitch, that is, the flattened tone). Indicates status only.

The operating mechanism of the lever member consists of a double-acting transmission device, and this device has a bar 10 swingably installed in the front column 6 as one of its main components. The upper end of this bar 10 is connected to the upper first string member 7 via a first flexible transmission cable 11 . The bar 10 is also in sliding contact with a cam disk 12, on which a circular boss 13 has a flexible second tension cable 14 which is prevented from slipping by friction or other suitable means. It will be wrapped around it. This second cable 14 is connected to the second lever member 8 on the lower side, and is connected to the pedal base 16 via the mooring part 15.
is connected to. This pedal base 16 is rotatable around a shaft 17 fixed to the base 5, is connected to the pedal 9, and is held at the highest position (rest position) by a coil spring 18. has been done.

In addition, in FIG. 1, the reference numeral 19 indicates the string member 7.
and 8 rotation axes are shown. Further, reference numeral 20 indicates a tension compensator, the function of which will be described later.

Next, in FIG. 2, the swing bar 10 is swingable around a U-shaped metal fitting 21 fixed to the front column 6. As shown in FIG. A first cable 11 is connected to the upper end of the swing bar 10;
The end of the cable 11 is passed through the slit 22 of the cable 11, and is then secured by suitable fixing means 23, such as rivets or welding. Alternatively, simply tie the cable to the bar. The other end of the cable 11 is attached to the tail of the harp with a return spring 2.
Connected via 4. Moreover, the cable 11 is
It passes through a hole provided in an arm 25 fixed to the pivot shaft 19 of the support member 26 of the string member 7, and is fixed to the arm 25 by a tightening screw 27.

Further, the bar 10 is connected to the cam 2 of the cam disk 29.
The circular boss 30 of the cam disk 29 has a groove around the periphery, and a second
The cable 14 is wound so as not to slip and is prevented from coming off by the fastener 30a. The other end of the cable 14 is connected to the tail of the harp via a return spring 31.

The cable 14 connects to the support member 3 of the second string member 8.
It passes through a hole provided in the arm 32 fixed to the rotation shaft 19 of No. 3 and is fixed to the arm 32 with a tightening screw 40. The cable 14 also passes through a guide wheel 34, the shaft 3 of which
5 is fixed to network 2. The cable 14 further passes through a groove 36 in the cylindrical member 20. Both ends 37 of this cylindrical member 20 are connected to tension springs 38 by which it is directed toward the lowest position in a side slit 39 provided in the neck 2. is energized.

As shown in FIGS. 2 and 3, the arms 2 of the support members 26 and 33 of the string members 7 and 8
5 and 32 are both tilted at approximately 45° to the caudal side (to the right in the figure) in the rest state. Also, 2
The cam 28, which has two parallel sides 42 and an arcuate side 43, also has a similar inclination, and the cylinder material member 20 (tension compensator) is moved to its lowest position by the action of the spring 38. It is coming.

Next, with reference to FIGS. 3 to 5, the mode of the string pushing action by the string members 7 and 8 will be explained.

First, FIG. 3 shows a state in which the pedal 9 is at its highest position, that is, a state in which the actuation mechanism is at rest. In this state, when string 1 is played, a strange tone is obtained.

From this state, when the player depresses the pedal 9 to the first position in order to shorten the string length by a semitone to obtain the original tone, the pedal base 16 moves to the cable 14.
, which causes the cam disc 29 to rotate approximately one-quarter of a turn counterclockwise. This provides the following two effects.

First of all, the rotation of the cam 28 with the cam disc 29 causes the bar 10 to rotate and tension the cable 11. Therefore, the arm 25 is rotated to the position shown in FIG. 4 overcoming the spring 24, and the string member 7 grips the string 1.
It acts as a string.

Second, the cable 14 is similarly pulled,
It becomes a straight line state as shown in FIG. spring 38
is weaker than the spring 31, so when a tensile force is applied to the cable 14, it stretches before the spring 31. Due to the above-mentioned difference in spring force, in this position the arm 32 of the string member 8
does not rotate.

Next, when the player further depresses the pedal 9 in order to obtain a whine, the cam disk 29 rotates another quarter turn counterclockwise to the position shown in FIG. The cable 14 is then further pulled from its straight state, so that the arm 32
rotates, the string member 8 operates, and the string 1 is pressed. Note that since the outermost side 43 of the cam 28 has an arcuate shape, the bar 10 continues to remain in the position shown in FIG. 4.

Next, FIG. 6 shows a modification of the operating mechanism shown in FIG. 2. In this variant, bar 1
0, a T-shaped lever 44 is used.
The branch 45 (the part that corresponds to the horizontal bar of the T-shape) of this W-shaped lever 44 is made the same as the bar 10, but the branch 46 (the part that corresponds to the vertical bar of the T-shape) is flexible. and its end 47 is rolled inward. This rolled end 4
7 has a groove 4 on its outer surface for passing the cable 14 through.
8 is provided.

In this variant, said branch 46 has the same function as the tension compensator 20 in the embodiment of FIG. The car 34 becomes unnecessary.

The manner of operation of this variant of the actuation mechanism of the lever members 7 and 8 is substantially the same as that previously described with reference to FIGS. 3 to 5. That is,
At rest, the branch 45 of the T-shaped lever 44 is
The bar 10 is in the same position as in FIG.
4 has been distorted. In this state, when the performer depresses the pedal 9 to the first position, the cable 14 is pulled and rotates the cam disc 29, and the action of the cam 28 causes the T-shaped lever 44 to rotate.
As a result of the rotation of the branch 45, the arm 25 is in the position shown in FIG. Cable 14 stretches and straightens, pushing branch 46 up. The next operating mode for obtaining the sound is exactly the same as that described above with reference to FIG.

Of course, in this modification of FIG. 6, the tension forces of the springs 24 and 31 are respectively T.
The tension is adjusted to be greater than the tension provided by the flexible branch 46 of the glyph lever 44. and cable 1
4 forms the desired bend while exerting a reaction force on the distal end 47 of the branch 46 of the T-shaped lever 44 in the rest state that is less than the force exerted on the T-shaped lever 44 by the cable 11. When the pedal is depressed to the position where the original sound is obtained, the end 47 applies pressure to the cable 14, but this pressure is weaker than the tension exerted on the cable 14 by the return spring 31. .

As described above, the present invention provides a pitch adjustment mechanism for a harp that is simpler than conventional ones, requires fewer adjustments, has fewer parts, and is therefore less expensive.

[Brief explanation of drawings]

The drawings show an embodiment of the invention, FIG. 1 being a front view of the device according to the invention partially shown in section, FIG.
The figure is an enlarged perspective view of the operating mechanism of the string member of the harp in Figure 1, Figures 3, 4, and 5 are schematic diagrams showing three operating states of the operating mechanism in Figure 2, and Figure 6 is a The figure is a perspective view of a modification of the actuation mechanism of FIG. 2. 1...Strings, 2...Netsuku, 3...Resonance board, 4...
...Resonance box, 6...Front column, 7, 8...Passenger string member, 9
... Pedal, 10 ... Swinging lever, 11 ... 1st
Cable, 13, 30... Boss, 14... Second cable, 20... Tension compensation device, 24, 31...
Return spring, 25, 32... Arm, 27, 40...
...Tightening screw, 44...T-shaped lever.

Claims (1)

[Claims] 1. The length of the string 1 stretched between the net 2 and the resonance board 3 is controlled by an actuation mechanism provided in the front pillar 6 and connected to a pedal 9 in the base 5. The harp is adjusted by upper and lower string members 7, 8 which are actuated, and the actuating mechanism of the string members 7, 8 is one double-acting mechanism for each of the notes from C to C of the scale. The double-acting transmission comprises at least one set of cables, the first cable 11 of which is connected to the upper series of first wedge members 7 to obtain the original sound. The second cable 14 is connected to the lower series of second string members 8 to form a string element for obtaining a sound, and the first and second cables 11 and 14 are connected to the pedal 9 via the swing control devices 10 and 44, and are connected to the swing control device 1.
0 and 44 divide the tensile action applied to the cables 11 and 14 into two stages to rotate the upper and lower string members 7 and 8, and rotate the upper and lower string members 7 and 8 separately. A harp characterized by being able to be moved sequentially. 2 The rocking control devices 10, 44 are composed of rocking bars, and the upper ends of the rocking bars are connected to the upper first string member 7 via the flexible first cable 11, and the rocking control devices 10, 44 are The bar is in sliding contact with the cam disk 29, and the circular boss 13 of this cam disk 29,
30, the second cable 14 is wrapped around the second cable 14 so as not to slip.
Harp according to claim 1, characterized in that it is connected to a string member (8) and a control pedal (9). 3 Return spring 24 to the end of cables 11, 14,
Claim 1, characterized in that a constant tension on the cables 11, 14 is maintained by a structure in which the return springs 24, 31 are connected and the other ends of the return springs 24, 31 are fixed to the tail of the harp. Or the harp according to any one of paragraph 2. 4. The transmission device has tension compensators 20, 44, which cause the second cable 14 to form a curved section when at rest, and the length of this curved section is equal to the circular shape of the cam 28. boss 13,3
0, and by rotation of the bosses 13 and 30, the curved portion of the cable 14 is extended linearly between its support portions 30 and 32. The harp according to any one of the ranges 1 to 3. 5 The support member 26 of the upper string member 7 and the support member 33 of the lower string member 8 connect the arm 2 to the first cable 11 and the second cable 14, respectively.
5, 32, and the arm 2
5 and 32 are arranged at equal angles with respect to the string 1, and the cam 28 has straight sides 41 and 42 that are parallel to each other and are tangent to the circular boss 30, and an arcuate edge at the outermost end. side 43, and when the operating mechanism is at rest, the lever members 7 and 8 do not operate;
The length of the string corresponds to a change in sound, and when a tensile force is applied by stepping on the pedal 9, the second cable 14 stretches and becomes straight, and the tension compensation devices 20 and 44 are in an open state. At the same time, without operating the support member 32 of the lower lever member 8, the cam 28 is rotated a quarter of a turn to swing the bars 10, 44.
By pulling the first cable 11,
As a result of rotating the arm 25 of the support member 26 of the upper string member 7 by a quarter, the string member 7 clamps the string at 1/18th of the length of the vibrating part and shortens it to obtain the original sound. When the pedal 9 is further depressed and the second cable 14 is further pulled, the arm 32 of the support member 33 of the lower string member 8 will be further extended by a quarter.
As a result of being rotated, the lower string member 8 grips the string at 1/18th of the length of the vibrating part and further shortens the string to produce a roaring sound. The support arm 32 of the cam 8 is parallel to the support arm 25 of the upper suspension member 7, while the support arm 32 of the cam 2
8 is until the state where the above-mentioned sound is obtained,
The swing bar 1 has an arcuate side 43 at its outermost end.
0, the swing bar 10 continues to remain in a fixed position without exerting an excessive pulling force on the first cable 11. A harp listed in any one of the following. 6. The tension compensator 20 is biased in the direction of forming a bend in the second cable 14 by the action of the tension spring 38, and the force of the tension spring 38 is applied to the second cable 14. The harp according to claim 4 or 5, characterized in that the force of the tension spring 31 is smaller than the force of the tension spring 31 of 41. 7. The double-acting transmission device is composed of a T-shaped lever 44, the upper branch 45 of which is connected to the first cable 11, and the lower end 47 of the lower branch 46.
Claims 1 to 5 have a groove 48 for passing the second cable 14, and form a curved part in the second cable 14 when at rest. A harp as described in any one of the above. 8. The cables 11, 14 pass through holes provided in the arms 25, 32 of the support members 26, 33 of the string members 7, 8, and are fixed to the arms 25, 32 by tightening screws 27, 40. A harp according to any one of claims 1 to 7, characterized in that: 9. According to any one of claims 1 to 8, characterized in that the first cable 11 is fixed to the upper end of the swing bar by rivets or welding, or simply tied. The harp mentioned.