CN113990272A - Automatic escape distance adjusting device based on piano mute system - Google Patents
Automatic escape distance adjusting device based on piano mute system Download PDFInfo
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- CN113990272A CN113990272A CN202111262773.3A CN202111262773A CN113990272A CN 113990272 A CN113990272 A CN 113990272A CN 202111262773 A CN202111262773 A CN 202111262773A CN 113990272 A CN113990272 A CN 113990272A
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- 230000009471 action Effects 0.000 description 5
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10C—PIANOS, HARPSICHORDS, SPINETS OR SIMILAR STRINGED MUSICAL INSTRUMENTS WITH ONE OR MORE KEYBOARDS
- G10C3/00—Details or accessories
- G10C3/16—Actions
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10C—PIANOS, HARPSICHORDS, SPINETS OR SIMILAR STRINGED MUSICAL INSTRUMENTS WITH ONE OR MORE KEYBOARDS
- G10C3/00—Details or accessories
- G10C3/16—Actions
- G10C3/20—Actions involving the use of hydraulic, pneumatic or electromagnetic means
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Abstract
The invention discloses a take-off distance automatic regulating device based on a piano mute system, wherein a first bracket and a second bracket are respectively arranged at the total gear of a string striking machine, a linkage shaft sequentially passes through the first bracket, a first swing arm and the second bracket from left to right, the linkage shaft is respectively and rotatably connected with the first bracket, the second bracket and the second swing arm, the first swing arm and the second swing arm swing by taking the linkage shaft as a shaft, a driving device is connected with a mute gear lever, the upper end of a pull rod is rotatably arranged on the mute gear lever, the lower end of the pull rod passes through the first swing arm, the lower part of the pull rod is provided with a threaded section, a pull rod length adjusting nut is screwed on the threaded end, the swing angle of the first swing arm is adjusted through the screwing-in depth of the pull rod length adjusting nut, a swing arm reset torsion spring is arranged at the joint of the linkage shaft and the first support, and the adjusting strip is fixed at the bottoms of the first swing arm and the second swing arm. The invention has simple structure and convenient mute adjustment, and can be matched with the angles of different mute stop levers on different pianos.
Description
Technical Field
The invention mainly relates to the technical field of pianos, in particular to an automatic disengaging distance adjusting device based on a piano muting system.
Background
With the popularization and development of pianos, the demand for not interfering others in the piano using process of a piano row or a family is increased, and the piano muting system gradually enters the market.
With the development of pianos, the demand for not disturbing others with sound during use of the pianos by a line or a home has increased, and piano muting systems have begun to be popularized.
Mechanical principle of piano action: when a key 1-1 is pressed downwards, a staple 1-2 starts to go upwards, the staple 1-2 pushes against a linkage 1-3 to run upwards by taking a linkage rotating shaft 1-4 as an axis, simultaneously a top rod 1-11 on the linkage 1-3 goes upwards synchronously, the top rod 1-11 pushes against a rotary hammer 1-14 to run upwards by taking a rotary hammer rotating shaft 1-13 as the axis, when a top rod 1-11 goes upwards to a top rod salient point 1-7 to touch the bottom surface of a disengaging distance adjusting button 1-8, the tip of a striking hammer 1-17 is 3-5mm away from a string, the key pressing process is not finished yet, the key is not pressed to the bottom, the linkage 1-3 continues to run upwards, at the moment, the top rod 1-11 is pushed by the top rod salient point 1-7, the top rod 1-11 is forced to disengage from the rotary hammer 1-14 by taking the top rod rotating shaft 1-5 as the axis, the butt converter 1-14 is continuously rotated and struck out by inertia force, the hammer 1-17 strikes the string 1-18, after striking is finished, the butt converter 1-14 is knocked back by the counter-vibration force of the string 1-18 and is caught by the support 1-12, so that the butt converter 1-14 is prevented from repeatedly bouncing and striking the string 1-18 after the key is pressed down or the resetting of the ejector rod 1-11 is interfered. When the key 1-1 is released and reset upwards, the linkage 1-3 falls down, the ejector rod reset spring 1-6 enables the top end of the ejector rod 1-11 to be reset to the bottom of the butt 1-14, and meanwhile the butt reset bridle belt 1-10 pulls the butt 1-14 to be timely reset to the initial position, which is shown in fig. 1 specifically.
The working principle of the mute system is as follows: after the mute system is started, the keys 1-1 are pressed down to hit the hammers 1-17, when the tips of the hitting hammers 1-17 advance to a position 5-9mm away from the strings 1-18, the mute shelves 1-16 prevent the hitting hammers 1-17 from continuing to advance, so that the strings 1-18 are not hit by the hitting hammers 1-17, the piano does not produce sound, meanwhile, a key motion capturing circuit of the mute system converts key behaviors into electronic organ sounds to be output to an earphone, and the use of the mute function is realized, and is particularly shown in fig. 2.
However, the operation of the mechanical structure of the piano itself is such that the take-off state is opened when the tip of the hammer 1-17 is struck to a distance of 3-5mm from the string 1-18. The take-off distance of 3-5mm is an important criterion for the piano to guarantee an optimum striking force and a maximum number of concussions, but this distance conflicts with the working principle of the muting system. The mute guard bar 1-16 prevents the hammer 1-17 from continuously striking when the distance between the hammer 1-17 and the string 1-18 is 5-9mm, the ejector rod 1-11 which is responsible for the pulling-in work is clamped by the bottom of the butt 1-14 and can not be pulled out, so that the piano striking structure can not complete the complete striking process, the key 1-1 can not be pressed to the bottom or can not be pressed with the blocking feeling, and the user can not experience the real striking process of the piano.
Therefore, in the mute system in the current market, in order to keep the real keystroke touch feeling in the mute state, the way of increasing the trip distance to 5-9mm is adopted. However, this will result in the normal playing of the piano in the non-mute state, and the force of the struck string of the hammer and the number of times of the lingering distance are sacrificed, which has a great negative effect on the professional-level performance of the piano.
The escape distance is adjusted on the piano by the up-and-down position of the escape distance adjusting knob 1-8, the position of the adjusting knob 1-8 is adjusted up, then when the tip of the striking hammer 1-17 strikes closer to the string 1-16, the ejector rod salient point 1-7 will hit the adjusting knob 1-8, the ejector rod 1-11 will start to escape from the butt 1-14 later, i.e. the so-called escape distance is smaller. Similarly, the lower the positions of the adjusting buttons 1-8 are, the larger the disengaging distance is.
Disclosure of Invention
In view of the above, the present invention provides an automatic adjusting device for take-off distance based on a piano mute system, which can make the take-off distance of the piano reach 5-9mm when the mute is turned on, and restore to 3-5mm when the mute is turned off, so that the addition of the mute system does not affect the parameters and performance of the piano itself.
The invention relates to an automatic escape and admission distance adjusting device based on a piano mute system, which comprises a first bracket, a second bracket, a mute stop lever, a driving device, a pull rod, a linkage shaft, a first swing arm, a second swing arm and an adjusting strip, wherein the first bracket and the second bracket are respectively arranged at the total stop of a string striking machine, the linkage shaft sequentially penetrates through the first bracket, the first swing arm and the second bracket from left to right, the linkage shaft is respectively and rotatably connected with the first bracket and the second bracket, the second swing arm is rotatably arranged on the linkage shaft, the first swing arm and the second swing arm swing by taking the linkage shaft as a shaft, the driving device is connected with the mute stop lever, the upper end of the pull rod is rotatably arranged on the mute stop lever, the lower end of the pull rod penetrates through the first swing arm, the lower part of the pull rod is provided with a thread section, and a pull rod length adjusting nut is screwed on the thread end, the swing angle of the first swing arm is adjusted through the screwing-in depth of the pull rod length adjusting nut, a swing arm reset torsion spring is arranged at the joint of the linkage shaft and the first support and used for enabling the first swing arm to press on the pull rod length adjusting nut, and the adjusting strip is fixed to the bottoms of the first swing arm and the second swing arm.
Furthermore, the quantity of second support and second swing arm is three, the universal driving shaft includes three linkage semi-axles, first support and three second support are installed in action machine total shelves department from a left side to the right side and with having the interval, all are provided with a linkage semi-axis between first support and the adjacent second support to and between the adjacent second support, and is three the swing arm is installed respectively in the right-hand member portion of three linkage semi-axles, and three the linkage semi-axis rotates with the axle center.
Furthermore, the first swing arm at least comprises a transverse plate and a longitudinal plate, the transverse plate is fixed to the top of the longitudinal plate, the lower end of the pull rod penetrates through the transverse plate, the leftmost linkage half shaft penetrates through the longitudinal plate, and the pull rod length adjusting nut is located below the transverse plate.
Further, all seted up the support shaft hole on first support and the three second support, the flat hole has been seted up on the diaphragm, the swing arm shaft hole has been seted up on the vertical plate, and is leftmost the linkage semi-axis passes the support shaft hole on the first support and the setting of swing arm shaft hole on the vertical plate, the shaft hole department at first support, all the other two is installed to the swing arm reduction of torsion spring the linkage semi-axis passes the support shaft hole setting rather than the second support of being connected respectively.
Furthermore, each end of the linkage half shaft is provided with a semicircular notch limiting groove, each second swing arm corresponds to one semicircular notch limiting groove, and the number of the second swing arms is three, and the second swing arms are completely consistent with the swing angle of the first swing arms through the corresponding semicircular notch limiting grooves.
Further, the adjusting strip is a cotton sliver, and the cotton sliver is fixed to the bottoms of the first swing arm and the second swing arm in a straight line manner.
Further, the thickness of the tampon is 0.4 mm.
Further, the automatic escape distance adjusting device based on the piano muting system further comprises a gear mechanism, and the driving device is in transmission connection with the muting gear lever through the gear mechanism.
The invention relates to an automatic escape distance adjusting device based on a piano mute system, which comprises a first bracket, a second bracket, a mute stop lever, a driving device, a pull rod, a linkage shaft, a first swing arm, a second swing arm and an adjusting strip, wherein the first bracket and the second bracket are respectively arranged at the total stop of a string striking machine, the linkage shaft sequentially penetrates through the first bracket, the first swing arm and the second bracket from left to right, the linkage shaft is respectively and rotatably connected with the first bracket and the second bracket, the second swing arm is rotatably arranged on the linkage shaft, the first swing arm and the second swing arm swing by taking the linkage shaft as a shaft, the driving device is connected with the mute stop lever, the upper end of the pull rod is rotatably arranged on the mute stop lever, the lower end of the pull rod penetrates through the first swing arm, the lower part of the pull rod is provided with a thread section, and a pull rod length adjusting nut is screwed on the thread end, the swing angle of the first swing arm is adjusted through the screwing-in depth of the pull rod length adjusting nut, a swing arm reset torsion spring is arranged at the joint of the linkage shaft and the first support and used for enabling the first swing arm to press on the pull rod length adjusting nut, and the adjusting strip is fixed to the bottoms of the first swing arm and the second swing arm. Through the arrangement, on one hand, the negative influence of the additionally-arranged upright piano mute system on the mechanical work of the original piano is avoided; on the other hand, when the piano mute system is switched on and switched off, the working states can be synchronously switched, the disengaging distance adjusting buttons are not required to be manually adjusted one by one to adjust the disengaging distance, the mute system can be normally used, and the opening and closing angle of the device switch can be adjusted by adjusting the mounting position of the pull rod length adjusting nut so as to be matched with the angles of different mute stop levers on different pianos.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic view of a prior art piano muting system adjusting device in an initial position;
FIG. 2 is a simplified schematic diagram of the embodiment of FIG. 1 in a mute state;
fig. 3 is a schematic structural view of the automatic escape distance adjusting apparatus based on the piano muting system of the present invention;
fig. 4 is an enlarged view of the automatic escape distance adjusting apparatus based on the piano muting system in fig. 3;
FIG. 5 is an enlarged view of portion A of FIG. 3;
FIG. 6 is a simplified schematic diagram of the embodiment of FIG. 3 in a mute-on state;
fig. 7 is a simplified configuration of the embodiment of fig. 3 in a mute off state.
Description of reference numerals:
keys 1-1; 1-2 of staple bolts; 1-3 of a linkage device; a linkage device rotating shaft 1-4; the mandril rotates 1-5; a mandril reset spring 1-6; 1-7 parts of ejector rod salient points; disengaging the distance adjusting button 1-8; 1-9 parts of a main gear of the string striking machine; the resetting climbing belt of the rotary beater is 1-10; 1-11 parts of a top rod; 1-12 parts of a log; 1-13 of a rotary shaft of the rotary beater; butt 1-14; 1-15 of a motor; a mute bar 1-16; hammer 1-17; strings 1-18; 3-1 of a pull rod; 3-2 of swing arm reset torsion spring; a first bracket 3-3; a first swing arm 3-4; 3-5 of cotton sliver; linkage half shaft 3-6; a second bracket 3-7; 3-8 parts of a second swing arm; 3-9 parts of a pull rod length adjusting nut; 3-10 parts of bracket fixing screws; cotton sliver fixing screws 3-11; and 3-12 screws are fixed by torsion springs.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In the present invention, the orientations such as "left", "right", "up", "down", etc. are used with reference to the view shown in fig. 1. The terms "first" and "second" are used primarily to distinguish one element from another, but do not limit the elements specifically.
As shown in fig. 3-5, the automatic adjusting device for the take-off distance based on the piano muting system of the embodiment of the invention comprises a first bracket 3-3, a second bracket 3-7, a muting lever, a driving device, a pull rod 3-1, a linkage shaft, a first swing arm 3-4, a second swing arm 3-8, a gear mechanism and an adjusting bar, wherein the first bracket 3-3 and the second bracket 3-7 are respectively installed at a total gear 1-9 of a string striking machine, specifically, the first bracket 3-3 is installed at the total gear 1-9 of the string striking machine through a bracket fixing screw 3-10, the linkage shaft sequentially passes through the first bracket 3-3, the first swing arm 3-4 and the second bracket 3-7 from left to right, the linkage shaft is respectively rotatably connected with the first bracket 3-3 and the second bracket 3-7, the second swing arm 3-8 is rotatably arranged on the linkage shaft, the first swing arm 3-4 and the second swing arm 3-8 swing by taking the linkage shaft as a shaft, the driving device is in transmission connection with the mute stop lever through a gear mechanism, the upper end of the pull rod 3-1 is rotatably arranged on the mute stop lever 1-16, the lower end of the pull rod 3-1 is arranged by penetrating through the first swing arm 3-4, the lower part of the pull rod 3-1 is provided with a thread section, a pull rod length adjusting nut 3-9 is screwed in the thread section, the swinging angle of the first swing arm 3-4 is adjusted by the screwing depth of the pull rod length adjusting nut 3-9, a swing arm reset torsion spring 3-2 is arranged at the connection part of the linkage shaft and the first bracket 3-3, and the swing arm reset torsion spring 3-2 is used for pressing the first swing arm 3-4 on the pull rod length adjusting nut 3-9, the adjusting strip is fixed at the bottom of the first swing arm 3-4 and the second swing arm 3-8. The driving device may be a component that outputs rotational motion, such as a hydraulic motor or an electric motor. In the embodiment shown in fig. 3 the drive means are motors 1-15. Preferably, in one embodiment of the present invention, the adjusting strip is a cotton sliver 3-5, the cotton sliver 3-5 is fixed to the bottoms of the first swing arm 3-4 and the second swing arm 3-8 in a straight line by a cotton sliver fixing screw 3-11, and the thickness of the cotton sliver 3-5 is 0.4 mm. Of course, there are many other possibilities for adjusting the type and thickness of the strip, and the technical effects of the present invention can be achieved.
Through the arrangement, when the mute gear lever 1-16 is driven by the motor 1-15 to be in a mute open state, the pull rod length adjusting nut 3-9 descends, the first swing arm 3-4 rotates downwards along with the pull rod length adjusting nut 3-9 under the elasticity of the swing arm reset torsion spring 3-2, the cotton sliver 3-5 at the lower end of the first swing arm 3-4 enters the bottom of the disengaging distance adjusting button 1-8, the bottom of the disengaging distance adjusting button 1-8 is increased by 0.4mm by the cotton sliver 3-5 (the action is the same as that of the disengaging distance adjusting button 1-8 which is adjusted downwards by 0.4mm in the prior art), at the moment, the ejector rod salient point 1-7 can impact the disengaging distance adjusting button 1-8 earlier, the piano disengaging distance is increased by 4mm to be in a disengaging distance of 5-9mm, and the running requirement of a mute system is met, see in particular fig. 6. When the mute stop lever 1-16 is turned into a mute closed state by the motor 1-15, the pull rod length adjusting nut 3-9 goes upward, the first swing arm 3-4 is driven by the pull rod length adjusting nut 3-9 to rotate upward, the cotton sliver 3-5 at the lower end of the first swing arm 3-4 is away from the bottom of the disengaging distance adjusting button 1-8, the bottom of the disengaging distance adjusting button 1-8 returns to the normal height, at the moment, the ejector rod salient point 1-7 returns to the time of impacting the disengaging distance adjusting button 1-8, and the piano disengaging distance returns to the normal distance of 3-5mm, which is shown in fig. 7 specifically.
In view of the fact that a piano action is generally divided into three parts, in a further technical scheme, the number of the second supports 3-7 and the number of the second swing arms 3-8 are three, the linkage shafts comprise three linkage half shafts 3-6, the first supports 3-3 and the three second supports 3-7 are arranged at the positions 1-9 of the action total gear from left to right at intervals, one linkage half shaft 3-6 is arranged between each first support 3-3 and the adjacent second support 3-7 and between the adjacent second supports 3-7, and the three second swing arms 3-8 are respectively arranged at the right ends of the three linkage half shafts 3-6, so that the three linkage half shafts 3-6 are connected and can rotate coaxially. Specifically, support shaft holes are formed in the first support 3-3 and the three second supports 3-7, the swing arm reset torsion spring 3-2 is mounted at the shaft hole of the first support 3-3 through a torsion spring fixing screw 3-12, and the other two linkage half shafts 3-6 are arranged through the support shaft holes of the second supports 3-7 connected with the swing arm reset torsion spring respectively. It should be noted that, in order to make the swing angles of the three second swing arms 3-8 completely consistent with the swing angles of the first swing arms 3-4, the end of each linkage half shaft 3-6 of the present invention is provided with a semicircular notch limiting groove, each second swing arm 3-8 corresponds to one semicircular notch limiting groove, the semicircular notch limiting groove is used for installing the corresponding second swing arm 3-8 at the same angle, and the three second swing arms 3-8 pass through the corresponding semicircular notch limiting grooves, so as to keep the swing angles completely consistent with the swing angles of the first swing arms 3-4.
As a preferred embodiment of the present invention, as shown in fig. 4, the first swing arm 3-4 at least includes a horizontal plate and a vertical plate, the horizontal plate is fixed on the top of the vertical plate, the lower end of the pull rod passes through the horizontal plate, the leftmost linkage half shaft 3-6 passes through the vertical plate, the pull rod length adjusting nut 3-9 is located below the horizontal plate, specifically, a flat hole is formed on the horizontal plate, a swing arm shaft hole is formed on the vertical plate, and the leftmost linkage half shaft 3-6 passes through the bracket shaft hole on the first bracket 3-3 and the swing arm shaft hole on the vertical plate.
The automatic escape distance adjusting device based on the piano mute system is characterized in that a first support 3-3 and three second supports 3-7 are arranged at four neutral positions of a piano string striking machine through screws, specifically, a linkage half shaft 3-6 is inserted into a swing arm shaft hole on a longitudinal plate, the linkage half shaft 3-6 is inserted into a support shaft hole of the first support 3-3, a swing arm reset torsion spring 3-2 is arranged at the support shaft hole, the lower end of a pull rod 3-1 is inserted into a flat hole of a transverse plate, the upper end of the pull rod 3-1 is rotatably arranged on a mute rod 1-16 through screws (the mute rod 1-16 is in a closed state at the moment), a pull rod length adjusting nut 3-9 is screwed into the lower end of the pull rod 3-1 after the operation is finished, and the depth of the pull rod length adjusting nut 3-9 is used for adjusting the angle of the swing arm (the swing arm reset torsion spring 3-9 is screwed into the lower end of the pull rod 3-1 The first swing arm 3-4 will be forced by-2 to press against the swing arm return torsion spring 3-2) to assume the angle shown in fig. 4.
Then, the other two linkage half shafts 3-6 are respectively inserted into the bracket shaft holes of the three second brackets, and the three second swing arms 3-8 are used for penetrating the right ends of the corresponding linkage half shafts 3-6, so that the three linkage half shafts 3-6 are connected and can rotate coaxially.
The angles of the three second swing arms 3-8 on the linkage half shafts 3-6 can be kept completely consistent with the angles of the first swing arms 3-4 due to semicircular notch limiting grooves of the linkage half shafts 3-6, and at the moment, a cotton sliver 3-5 with the thickness of 0.4mm is straightened and is locked at the bottoms of the first swing arms 3-4 and the three second swing arms 3-8 in sequence by screws, so that the cotton slivers 3-5 form a straight line, which is shown in specific figures 3-5.
On one hand, the device can avoid the negative influence of the additional installation of the mute system of the upright piano on the market on the mechanical work of the original piano; on the other hand, when the piano mute system is switched on and switched off, the working state can be synchronously switched, the release distance can be adjusted without manually adjusting release distance adjusting buttons one by one, the mute system can be normally used, particularly, the transition value of the device to the release distance can be increased or reduced by adjusting the thickness of the cotton strips 3-5, and the release distance can be increased by 1mm when the thickness is increased by 0.1 mm; meanwhile, the installation position of the pull rod length adjusting nut 3-9 is adjusted to fit the angles of different mute stop rods 1-16 on different pianos, so that the rotation angle of the pull rod 3-1 is controlled.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. An automatic adjusting device for a take-off distance based on a piano mute system is characterized by comprising a first support, a second support, a mute stop lever, a driving device, a pull rod, a linkage shaft, a first swing arm, a second swing arm and an adjusting strip, wherein the first support and the second support are respectively arranged at a total stop of a string striking machine, the linkage shaft sequentially penetrates through the first support, the first swing arm and the second support from left to right, the linkage shaft is respectively and rotatably connected with the first support and the second support, the second swing arm is rotatably arranged on the linkage shaft, the first swing arm and the second swing arm swing by taking the linkage shaft as a shaft, the driving device is connected with the mute stop lever, the upper end of the pull rod is rotatably arranged on the mute stop lever, the lower end of the pull rod penetrates through the first swing arm, a thread section is arranged at the lower part of the pull rod, and a pull rod length adjusting nut is screwed into the thread end, the swing angle of the first swing arm is adjusted through the screwing-in depth of the pull rod length adjusting nut, a swing arm reset torsion spring is arranged at the joint of the linkage shaft and the first support and used for enabling the first swing arm to press on the pull rod length adjusting nut, and the adjusting strip is fixed to the bottoms of the first swing arm and the second swing arm.
2. The automatic escape distance adjusting device based on the piano muting system according to claim 1, wherein the number of the second brackets and the number of the second swing arms are three, the linkage shaft comprises three linkage half shafts, the first bracket and the three second brackets are installed at a total gear of the string striking machine from left to right with intervals, one linkage half shaft is respectively arranged between the first bracket and the adjacent second bracket and between the adjacent second brackets, the three swing arms are respectively installed at the right ends of the three linkage half shafts, and the three linkage half shafts rotate coaxially.
3. The automatic escape distance adjusting device based on the piano muting system of claim 2, wherein the first swing arm at least comprises a transverse plate and a longitudinal plate, the transverse plate is fixed on the top of the longitudinal plate, the lower end of the pull rod is arranged by penetrating through the transverse plate, the leftmost one of the linkage half shafts is arranged by penetrating through the longitudinal plate, and the pull rod length adjusting nut is located below the transverse plate.
4. The automatic escape distance adjusting device based on the piano muting system of claim 3, wherein the first support and the three second supports are provided with support shaft holes, the transverse plate is provided with a flat hole, the longitudinal plate is provided with a swing arm shaft hole, the leftmost one of the linkage half shafts passes through the support shaft hole of the first support and the swing arm shaft hole of the longitudinal plate, the swing arm reset torsion spring is installed at the shaft hole of the first support, and the other two of the linkage half shafts pass through the support shaft holes of the second supports connected with the swing arm reset torsion spring respectively.
5. The automatic escape distance adjusting device based on the piano muting system of claim 4, wherein each linkage half shaft is provided with a semicircular notch limiting groove at its end, each second swing arm corresponds to a semicircular notch limiting groove, and three second swing arms are kept identical to the swing angle of the first swing arm through the corresponding semicircular notch limiting grooves.
6. The automatic adjusting device of take-off distance based on piano silencing system of any one of claims 1 to 5, wherein the adjusting strip is a cotton sliver fixed in straight line at the bottom of the first and second swing arms.
7. The automatic adjusting device of take-off distance based on piano muting system according to claim 6, wherein the thickness of the sliver is 0.4 mm.
8. The automatic escape distance adjusting apparatus for a piano-based muting system according to claim 1, further comprising a gear mechanism, wherein the driving means is drivingly connected to the muting lever through the gear mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111262773.3A CN113990272B (en) | 2021-10-28 | 2021-10-28 | Automatic adjusting device for disengaging distance based on piano mute system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111262773.3A CN113990272B (en) | 2021-10-28 | 2021-10-28 | Automatic adjusting device for disengaging distance based on piano mute system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113990272A true CN113990272A (en) | 2022-01-28 |
| CN113990272B CN113990272B (en) | 2024-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111262773.3A Active CN113990272B (en) | 2021-10-28 | 2021-10-28 | Automatic adjusting device for disengaging distance based on piano mute system |
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| CN113990272B (en) | 2024-06-14 |
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