Guqin sand sound elimination measuring scale

Abstract

The utility model discloses a seven-stringed plucked instrument sand sound elimination measuring scale, which comprises a string path measuring scale and a Yueshan clamp, a string position fixing clamping groove is arranged on the Yueshan clamp, a string path contrast paper is detachably connected to the side surface of the upper part of the string path measuring scale, the string path measuring scale is fixedly connected with an adjustable support rod, and the adjustable support rod is fixedly connected with the string path measuring scale. The string path measuring ruler is slidably provided with a measuring rod assembly through a track, the measuring rod assembly comprises a measuring rod and a recording pen, and when the measuring rod slides on a guqin panel, the recording pen leaves handwriting on string path contrast paper, that is, the measuring rod drives the recording pen, and the lower end of the measuring rod is in contact with the guqin surface all the time. Therefore, the recording pen records the curve reflecting the state of the piano surface.

Description

Technical Field

[0001] The utility model relates to the technical field of musical instruments, and more specifically, to a guqin sand sound elimination measuring ruler. Background Art

[0002] The guqin is a traditional wooden musical instrument. Sand sound is a common defect of the guqin, which needs to be eliminated during the process of making the guqin and may also occur in the finished guqin. The sand sound is manifested as a hoarse noise under the string when plucking. The reasons for its generation can generally be divided into two categories. One is that there are small knots on the strings, and this type of problem is easy to handle, just replace the strings. The other is that the guqin soundboard is uneven, and it is difficult to find the tiny uneven places on the soundboard. At present, generally, it depends on the lute maker to find the problem of the guqin sand sound while playing, and solve the sand sound phenomenon by grinding. This method highly relies on artificial experience, has a high threshold and low efficiency. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a guqin sand sound elimination measuring ruler and method to solve the problem of difficultly finding the position on the guqin soundboard that causes the sand sound problem of the guqin. The technical solution is as follows:

[0004] A guqin sand sound elimination measuring ruler includes a string path measuring ruler and a yueshan clip for fixedly installing on the yueshan of the guqin. The yueshan clip is provided with a string position fixing card slot. A string path comparison paper is detachably connected to the upper side of the string path measuring ruler. The lower end of the string path measuring ruler is provided with a measuring ruler card edge that cooperates with the string position fixing card slot for clamping one end of the string path measuring ruler into the string position fixing card slot. The other end of the string path measuring ruler is fixedly connected with an adjustable support rod. A track is opened on the side of the string path measuring ruler, and a measuring rod assembly is slidably installed on the string path measuring ruler through this track.

[0005] Further, the measuring rod assembly includes a slider, a fixing plate, a sleeve one, a sleeve two, a measuring rod, a recording rod, a recording pen and a variable speed gear module. The sleeve one and the sleeve two are both vertically fixedly connected to the fixing plate. The fixing plate is fixedly connected with the slider. The measuring rod is movably sleeved in the sleeve one, and the recording rod is movably sleeved in the sleeve two. The measuring rod and the recording rod are connected through the variable speed gear module, where:

[0006] The variable speed gear module includes a gear one and a gear two. The gear two is a coaxial gear. Longitudinally arranged racks are provided on both the measuring rod and the recording rod. The rack on the measuring rod meshes with the gear one. The gear one meshes with the driving gear of the gear two. The driven gear of the gear two meshes with the rack of the recording rod. The radius of the driven gear is greater than the radius of the driving gear. The slider is slidably connected with the track. A ball pen tip is installed at the lower end of the measuring rod. The recording pen is detachably installed on the measuring rod for leaving a handwriting on the string path comparison paper when the measuring rod slides on the guqin soundboard through the ball pen tip.

[0007] Furthermore, the Yue mountain clamp includes an outer clip, an inner clip, a clamping bolt, an outer attached clip, a pressing knob and a Y-shaped card slot. The inner clip is used to be arranged on the inner side of the Yue mountain of the guqin, and the outer clip is used to be arranged on the outer side of the Yue mountain of the guqin. The outer clip and the inner clip are clamped on the Yue mountain of the guqin through at least two clamping bolts. Both ends of the outer attached clip are fixedly connected to the outer side of the outer clip, and there is a gap between the middle part of the outer attached clip and the outer clip. The lower end of the Y-shaped card slot is placed at this gap and can be fixed by the pressing knob. The upper end of the Y-shaped card slot opens upward to form a string position fixing card slot, and scales are arranged on the outer attached clip.

[0008] Furthermore, the track is an I-shaped track.

[0009] Furthermore, the recording pen is arranged perpendicular to the paper surface of the string path comparison paper. A mounting through groove is horizontally arranged on the recording rod for mounting the recording pen. A screw hole is arranged at the top end of the recording rod, and the screw hole penetrates downward through the mounting through groove. A recording pen fixing knob that matches the thread of the screw hole is arranged in the screw hole for fixing the recording pen mounted in the mounting through groove.

[0010] Furthermore, a string path comparison paper groove is opened on the upper side of the string path measuring ruler, and string path comparison paper clips for fixing both ends of the string path comparison paper are connected to both ends of the string path comparison paper groove.

[0011] Furthermore, the adjustable support rod includes a fixed rod sleeve and a rotating rod. Among them, the fixed rod sleeve has internal threads, and the rotating rod has external threads that match the fixed rod sleeve and is sleeved in the fixed rod sleeve.

[0012] Furthermore, scales are arranged on both the rotating rod and the measuring rod.

[0013] Furthermore, reference emblem positions are marked on the side of the string path measuring ruler.

[0014] Furthermore, the string path comparison paper is matte paper, on which string path reference lines are pre-printed.

[0015] For the measurement method of a guqin sand sound elimination measuring ruler described in the present utility model, by applying the above-mentioned guqin sand sound elimination measuring ruler, the measurement steps include:

[0016] S1. Prepare a guqin that needs to eliminate sand sound, fixedly install the Yue mountain clamp, and place the card edge of the measuring ruler in the string position fixing card slot;

[0017] S2. Stand the adjustable support rod on the corresponding string path at the tail of the qin, push the measuring rod to the highest point on the qin surface. The highest point is between the second and third emblems of the qin. Adjust the adjustable support rod until the relative height of the adjustable support rod to the qin surface is the same as the relative height of the measuring rod to the qin surface;

[0018] S3. Install the string path comparison paper and make the recording pen contact the paper surface;

[0019] S4. Let the measuring rod move closely along the surface of the qin towards the other end, and the recording pen will draw the string path curve;

[0020] S5. According to the string path curve, the position of the depression or protrusion causing the buzzing sound can be found.

[0021] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0022] It is not necessary to rely on experienced qin makers, and the measurer can judge the position on the qin surface that causes the buzzing sound without listening to the sound; the qin surface paint is not damaged during the measurement process, the measurement threshold is low, the judgment is rapid, and the efficiency is high; it has the effect of magnifying and displaying the tiny depressions or protrusions on the qin surface. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the guqin buzzing sound elimination measuring ruler of the present utility model.

[0024] Figure 2 It is a schematic structural diagram of the yueshan clamp of the present utility model.

[0025] Figure 3 It is a schematic structural diagram of the measuring rod of the present utility model.

[0026] Figure 4 It is a schematic structural diagram of the adjustable support rod of the present utility model.

[0027] Figure 5 It is a schematic structural diagram of the string path comparison paper of the present utility model.

[0028] Figure 6 It is a schematic structural diagram of the variable speed gear module of the present utility model.

[0029] Explanation of the reference numerals in the drawings:

[0030] 1. Adjustable support rod; 101. Fixed rod sleeve; 102. Rotating rod; 103. Knob; 2. String path comparison paper clip; 3. String path comparison paper groove; 4. Track; 5. Reference hui position; 6. Measuring rod assembly; 601. Slide block; 602. Fixed plate; 603. Sleeve one; 604. Sleeve two; 605. Measuring rod; 6051. Ball pen tip; 606. Recording rod; 607. Recording pen; 608. Variable speed gear module; 6081. Gear one; 6082. Gear two; 609. Recording pen fixing knob; 7. String path comparison paper; 701. String path reference line; 8. Yueshan clamp; 801. Outer clip; 802. Inner clip; 803. Clamping bolt; 804. Outer attached clip; 805. Pressing knob; 806. Y-shaped card slot; 9. Measuring ruler card edge; 10. Guqin yueshan; 11. Guqin hui position. Detailed implementation mode

[0031] Please refer to Figure 1-6 , the figure shows the guqin sand sound elimination measuring ruler of the present utility model, where Figure 1 shows the main structure of the measuring ruler, including a string path measuring ruler and a yue mountain clip 8 for fixedly connecting to the yue mountain 10 of the guqin. The string path measuring ruler and the yue mountain clip 8 need to be used in cooperation.

[0032] Figure 2 The yue mountain clip 8 is shown as including an outer clip piece 801, an inner clip piece 802, a clamping bolt 803, an outer attached clip piece 804, a pressing knob 805 and a Y-shaped card slot 806. The inner clip piece 802 is arranged on the inner side of the yue mountain 10 of the guqin, and the outer clip piece 802 is used to be arranged on the outer side of the yue mountain 10 of the guqin. The inner clip piece 802 has a lower height. The outer clip piece 801 and the inner clip piece 802 are clamped on the yue mountain 10 of the guqin through two clamping bolts 803 located at both ends. The two ends of the outer attached clip piece 804 are fixedly connected to the outside of the outer clip piece 801, and there is a gap between the middle part of the outer attached clip piece 804 and the outer clip piece 801. The lower end of the Y-shaped card slot 806 is placed at this gap and can be fixed by the pressing knob 805. The upper end of the Y-shaped card slot 806 opens upward to form a string position fixing card slot. The outer attached clip piece 804 is provided with scales. Generally, there are multiple Y-shaped card slots 806, and with the help of the scales arranged on the outer attached clip piece 804, the multiple Y-shaped card slots 806 are equidistantly distributed.

[0033] A horizontal string path comparison paper slot 3 is opened on the upper side of the string path measuring ruler. String path comparison paper clips 2 for fixing both ends of the string path comparison paper 7 are installed at both ends of the string path comparison paper slot 3. Through these two string path comparison paper clips 2, the string path comparison paper 7 placed in the string path comparison paper slot 3 is clamped to prevent it from falling off. In this embodiment, the string path comparison paper 7 is matte paper, with a specification of 157g weight per square meter, and the Figure 5 shown string path reference line 701 is pre-printed on it.

[0034] The lower end of the string path measuring ruler is provided with a measuring ruler card edge 9 that cooperates with the string position fixing card slot for clamping one end of the string path measuring ruler into the string position fixing card slot. In this embodiment, the string position fixing card slot j is the card slot formed by the upper part of the Y-shaped card slot 806 opening upward. The other end of the string path measuring ruler is fixedly connected with an adjustable support rod 1. A track 4 is opened on the side of the string path measuring ruler. The track 4 is horizontally arranged, and the cross-section of the track 4 can be a circular track, an I-shaped track or an L-shaped track, etc. In this embodiment, it is an I-shaped track. The string path measuring ruler is slidably installed with a measuring rod assembly 6 through this track 4. Using the I-shaped track in this embodiment makes the slider 601 not easy to fall off the track on the string path measuring ruler.

[0035] Figure 3As shown in the figure, the measuring rod assembly 6 includes a slider 601, a fixing plate 602, a first sleeve 603, a second sleeve 604, a measuring rod 605, a recording rod 606, a recording pen 607, and a speed change gear module 608. The first sleeve 603 and the second sleeve 604 are both vertically and fixedly connected to the fixing plate 602. The fixing plate 602 is fixedly connected to the slider 601. The slider 601 is slidably mounted on the track 4. The measuring rod 605 is movably sleeved in the first sleeve 603, and the recording rod 606 is movably sleeved in the second sleeve 604. The measuring rod 605 and the recording rod 606 are connected by the speed change gear module 608. Since the measuring rod 605 is movably sleeved in the first sleeve 603, it has freedom in the vertical direction. A ball pen tip 6051 is installed at the lower end of the measuring rod 605. The ball pen tip 6051 is provided for two purposes. One is to facilitate sliding, and the other is to protect the surface of the guqin. The recording pen 607 is detachably installed on the vertical recording rod 606 and is used to leave a handwriting on the string path comparison paper 7 when the measuring rod 605 slides on the guqin panel through the ball pen tip 6051. During this process, the measuring rod 605 has freedom in the longitudinal direction. When it passes through the uneven surface of the guqin below, it moves up and down. The displacement of this up and down movement is amplified to the recording rod 606 through the speed change gear module 608 and is finally recorded by the recording pen 607.

[0036] As Figure 6 , the above-mentioned speed change gear module 608 includes a first gear 6081 and a second gear 6082. The second gear 6082 is a coaxial gear. Longitudinally arranged racks are provided on both the measuring rod 605 and the recording rod 606. The rack on the measuring rod meshes with the first gear 6081. The first gear 6081 meshes with the driving gear of the second gear 6082. The driven gear of the second gear 6082 meshes with the rack of the recording rod 606. The radius of the driven gear needs to be greater than the radius of the driving gear, so as to achieve the effect of the longitudinal displacement method.

[0037] The recording pen 603 is arranged perpendicular to the paper surface of the string path comparison paper 7. A mounting through groove is transversely provided on the recording rod 606 for mounting the recording pen 603, that is, this mounting through groove is perpendicular to the paper surface of the string path comparison paper 7. A screw hole is provided at the top of the recording rod 606. The screw hole penetrates downward through the mounting through groove. A recording pen fixing knob 609 that matches the thread of the screw hole is provided in the screw hole for fixing the recording pen 603 mounted in the mounting through groove. A scale is provided on the vertically moving measuring rod 605.

[0038] Figure 4 The adjustable support rod 1 shown in the figure includes a fixed rod sleeve 101 and a rotating rod 102. Among them, the fixed rod sleeve 101 has internal threads, and the rotating rod 102 has external threads that match the fixed rod sleeve 101 and is sleeved in the fixed rod sleeve 101. A scale is also provided on the rotating rod 102. A knob 103 is fixedly provided at the top of the rotating rod 102, so that it is easy for the user to apply a torque to the rotating rod 102 and facilitates operation.

[0039] In addition, in this embodiment, a reference position 5 is marked on the side of the string path measuring ruler, which can be used to assist in judging the approximate position when the measuring rod 605 slides on the soundboard of the guqin.

[0040] The specific measuring steps of the sand sound elimination measuring ruler of the present utility model include:

[0041] S1. Prepare the guqin for which sand sound needs to be eliminated. Align the Y-shaped card slot 806 on the yue mountain clamp 8 with the string hole of the guqin, and then tighten the clamping bolt 803 to fixedly install it on the yue mountain 10 of the guqin. If multiple Y-shaped card slots 806 cannot be aligned, loosen the compression knob 805, adjust the position of the Y-shaped card slot 806, and then tighten the compression knob 805. Then place the card edge 9 of the measuring ruler in the string position fixing card slot 801;

[0042] S2. Stand the adjustable support rod 1 on the corresponding string path at the tail of the guqin, and push the measuring rod 605 to the highest position on the soundboard. The highest position is between the second and third positions of the guqin. Figure 1 As shown in the guqin positions 11 on the soundboard of the guqin, adjust the knob 103 of the adjustable support rod 1 until the relative height of the adjustable support rod 1 with respect to the soundboard is the same as the relative height of the measuring rod 605 with respect to the soundboard, so that the scale of the rotating rod 102 of the adjustable support rod 1 is the same as the scale of the measuring rod 605;

[0043] S3. Place the string path comparison paper 7 into the string path comparison paper slot 3, and clamp and fix it with the string path comparison paper clips 2 at both ends. Adjust the recording pen 607 at the upper end of the recording rod 607 and make the recording pen 607 contact the paper surface;

[0044] S4. Let the measuring rod 605 closely adhere to the soundboard and move towards the other end, and the recording pen 607 will draw a string path curve on the string path comparison paper 7;

[0045] S5. According to the string path curve and the string path reference line 701, the position of the depression or protrusion that causes the sand sound can be intuitively and quickly found. The upwardly curved part of the obtained string path curve corresponds to a protrusion defect at the position of the soundboard, while the downwardly curved part of the string path curve reflects a depression defect at the corresponding position on the soundboard. The protrusion or depression defects will cause the sand sound of the guqin.

[0046] Through the measuring ruler and measuring method of the present utility model, it is not necessary to rely on an experienced guqin maker, nor is it necessary to listen to the sound to judge the position on the soundboard that causes the sand sound. The threshold is low, the judgment is rapid, the efficiency is high, and the paint surface of the guqin is not damaged during the measuring process. When encountering a micro depression or protrusion defect on the soundboard of the guqin, it can magnify and display it on the paper.

[0047] The above are only the preferred specific embodiments of the present utility model; however, the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its improved concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.

Claims

1. A measuring ruler for eliminating sand sound of guqin, characterized in that: The invention comprises a string path measuring ruler and a yueshan clamp (8) for being fixedly mounted on a yueshan (10) of an ancient guqin, wherein the yueshan clamp (8) is provided with a string position fixing slot, a string path comparison paper (7) is detachably connected to the upper side surface of the string path measuring ruler, a measuring ruler clamping edge (9) matched with the string position fixing slot is provided at the lower end of the string path measuring ruler, and is used for clamping one end of the string path measuring ruler into the string position fixing slot, and the other end of the string path measuring ruler is fixedly connected to an adjustable support rod (1), a track (4) is provided on the side surface of the string path measuring ruler, and a measuring rod assembly (6) is slidably mounted on the string path measuring ruler via the track (4).

2. The guqin sand sound elimination measuring ruler according to claim 1, characterized in that: The measuring rod assembly (6) comprises a slider (601), a fixing plate (602), a sleeve 1 (603), a sleeve 2 (604), a measuring rod (605), a recording rod (606), a recording pen (607) and a speed change gear module (608), wherein the sleeve 1 (603) and the sleeve 2 (604) are both vertically fixedly connected to the fixing plate (602), the fixing plate (602) is fixedly connected to the slider (601), the measuring rod (605) is movably sleeved in the sleeve 1 (603), the recording rod (606) is movably sleeved in the sleeve 2 (604), and the measuring rod (605) and the recording rod (606) are connected via the speed change gear module (608), wherein: The speed change gear module (608) includes gear 1 (6081) and gear 2 (6082), wherein gear 2 (6082) is a coaxial gear, and the measuring rod (605) and the recording rod (606) are both provided with longitudinally arranged racks, the racks on the measuring rod (605) mesh with gear 1 (6081), the gear 1 (6081) meshes with the driving gear of gear 2 (6082), and the driven gear of gear 2 (6082) meshes with the recording gear. The rack of the recording rod (606) is meshed, the radius of the driven gear is greater than the radius of the driving gear, the slider (601) is slidably connected to the track (4), a ballpoint pen tip (6051) is installed at the lower end of the measuring rod (605), and the recording pen (607) is detachably installed on the measuring rod (605), so that when the measuring rod (605) slides on the guqin panel through the ballpoint pen tip (6051), the recording pen (607) leaves a mark on the string comparison paper (7).

3. The guqin sand sound elimination measuring ruler according to claim 2, characterized in that: The yueshan clamp (8) comprises an outer clamp (801), an inner clamp (802), a clamping bolt (803), an outer clamp (804), a clamping knob (805) and a Y-shaped slot (806), wherein the inner clamp (802) is used to be arranged on the inner side of the guqin yueshan (10), and the outer clamp (801) is used to be arranged on the outer side of the guqin yueshan (10), and at least two clamping bolts are provided between the outer clamp (801) and the inner clamp (802). The bolt (803) is clamped on the guqin Yueshan (10), and the two ends of the external clamp (804) are fixedly connected to the outside of the external clamp (801), and a gap is provided between the middle part and the external clamp (801). The lower end of the Y-shaped slot (806) is placed in the gap and can be clamped and fixed by a clamping knob (805). The upper end of the Y-shaped slot (806) opens upward to form a string position fixing slot, and a scale is provided on the external clamp (804).

4. A guqin sand sound elimination measuring ruler according to claim 3, characterized in that: The track (4) is an I-shaped track.

5. The guqin sand sound elimination measuring ruler according to claim 4, characterized in that: The recording pen (607) is arranged perpendicular to the paper surface of the string comparison paper (7), and a mounting groove is arranged horizontally on the recording rod (606) for mounting the recording pen (607). A screw hole is arranged at the top of the recording rod (606), and the screw hole passes through the mounting groove downward. A recording pen fixing knob (609) matching with the thread of the screw hole is arranged in the screw hole, and is used to fix the recording pen (607) installed in the mounting groove.

6. The guqin sand sound elimination measuring ruler according to claim 5, characterized in that: A string path comparison paper slot (3) is provided on the upper side of the string path measurement ruler, and string path comparison paper clips (2) for fixing two ends of string path comparison paper (7) are connected to the two ends of the string path comparison paper slot (3).

7. The guqin sand sound elimination measuring ruler according to claim 6, characterized in that: The adjustable support rod (1) comprises a fixed rod sleeve (101) and a rotating rod (102), wherein the fixed rod sleeve (101) has an internal thread, and the rotating rod (102) has an external thread matching the fixed rod sleeve (101) and is sleeved in the fixed rod sleeve (101).

8. The guqin sand sound elimination measuring ruler according to claim 7, characterized in that: The rotating rod (102) and the measuring rod (605) are both provided with scales.

9. The guqin sand sound elimination measuring ruler according to claim 8, characterized in that: A reference mark (5) is marked on the side of the chord measuring ruler.

10. The guqin sand sound elimination measuring ruler according to claim 9, characterized in that: The string path comparison paper (7) is a matte powder paper on which string path reference lines (701) are pre-printed.

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