An automatic playing system for an upright piano

Abstract

The present invention discloses an automatic playing system for an upright piano, which comprises an adjusting frame, a hammer action driving device, a sustain pedal driving device and a control module; the hammer action driving device is adjustably assembled on the adjusting frame and is used for driving the hammer action of the upright piano to produce sound; the adjusting frame is used for being installed on both sides of the piano, and the adjusting frame can adjust the position of the hammer action driving device to adapt to different models of upright pianos; the sustain pedal driving device is used for being installed inside the piano and connected with the piano sustain system, and the sustain pedal driving device can drive the piano sustain system to sustain; the control module is electrically connected with the hammer action driving device and the sustain pedal driving device. The present invention makes full use of the space inside the piano, does not damage the structure of the upright piano body, is installed without damage, is simple and convenient, can be finely adjusted to be applicable to most upright pianos, and the performance is accurate and smooth.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic piano performance, and particularly to an upright piano automatic performance system. Background Art

[0002] As the king of musical instruments, the piano plays an important role in the art of music. However, since it is difficult for the general public to play the piano due to the high threshold, the research and development of an automatic piano performance system is extremely urgent.

[0003] Most traditional upright piano automatic performance devices are installed at the bottom of the keys. Instead of manually pressing the keys, they push the inner ends of the keys upward, thereby driving the linkage lever of the piano sound generation system to move upward, and finally converting it into the felt of the hammer hitting the strings to produce sound.

[0004] Although these upright piano automatic performance devices can achieve the effect of automatic performance, they also have several common problems: 1. Due to the space limitation of the piano itself, the drive structure of the traditional upright piano automatic performance system cannot be installed, and it is necessary to cut off the original structure of the piano to install the drive structure, which is an irreparable damage to the expensive piano. 2. The drive structure of the traditional upright piano automatic performance system cannot perfectly perform piano pieces. During the performance, it is impossible to accurately express the change of performance intensity, and even wrong notes may occur. On the one hand, it is related to the arrangement and structure of the electromagnet, and on the other hand, because there are too many and too dense key positions and the space is narrow, the drive structure is prone to interference and misalignment when installed too tightly. 3. The structure of the traditional upright piano automatic performance system is cumbersome and difficult to install. Workers often need to spend a lot of time to complete the installation and adjustment process, and at the same time, it requires workers to have high installation skills. 4. Many automatic performance devices do not have an automatic sustain function, or the automatic sustain device is too complex, resulting in very difficult installation and great inconvenience. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an upright piano automatic performance system that makes full use of the space inside the piano, does not damage the structure of the upright piano body, is installed without damage, is simple and convenient, can be finely adjusted to suit most upright pianos, and performs accurately and smoothly.

[0006] To solve the above technical problems, the technical solution of the present invention is:

[0007] An upright piano automatic performance system, which includes an adjustment frame, a hammer action driving device, a sustain pedal driving device, and a control module;

[0008] The hammer action driving device is adjustably assembled on the adjustment frame and is used to drive the piano sound generation system to produce sound;

[0009] The adjustment frame is used to be installed on both sides of the piano, and the adjustment frame can adjust the position of the hammer drive device to adapt to different models of upright pianos;

[0010] The sustain pedal drive device is used to be installed inside the piano and connected to the piano's sustain system, and the sustain pedal drive device can drive the piano's sustain system to produce sustain;

[0011] The control module is electrically connected to the hammer drive device and the sustain pedal drive device.

[0012] Furthermore, the adjustment frame includes a main frame and two clamping mechanisms slidably assembled at both ends of the top of the main frame;

[0013] The two clamping mechanisms are used to clamp on both side plates of the piano, and the hammer drive device is adjustably assembled on the main frame.

[0014] Furthermore, two slide rail frames are horizontally arranged in the middle of the main frame in an up-and-down manner, and a smooth rod is horizontally arranged at the bottom of the main frame;

[0015] The hammer drive device includes eighty-eight electromagnetic drive mechanisms. The tops of the eighty-eight electromagnetic drive mechanisms are staggered up and down and slidably assembled on the two slide rail frames, and the bottoms of the eighty-eight electromagnetic drive mechanisms are all rotationally connected to the smooth rod by a revolute pair.

[0016] Furthermore, the electromagnetic drive mechanism includes a frame base slidably assembled on the slide rail frame, a first proportional electromagnet installed in the frame base, a hinge provided at the output shaft end of the first proportional electromagnet, a connecting rod rotatably connected to the bottom end of the hinge, and a driving lever rotatably connected to the bottom end of the connecting rod and rotatably installed on the smooth rod;

[0017] When the first proportional electromagnet is energized, it will drive the connecting rod to press down one end of the driving lever. When the driving lever rotates, the other end forms a higher pair contact with the linkage lever of the piano hammer, thereby pushing the linkage lever of the piano hammer to move upward;

[0018] The end face contour of the contact end of the driving lever is a curved surface and is in an arc shape adapted to the linkage lever, and a high molecular wear-resistant strip is provided at the contact end of the driving lever.

[0019] Furthermore, a first T-shaped chute is opened at the top of the slide rail frame, a first bolt member is installed on the frame base, the bottom end of the first bolt member is slidably clamped in the first T-shaped chute, and the frame base can be locked by the mother part of the first bolt member.

[0020] Furthermore, a magnetic insulation baffle is also provided on one side of the frame base.

[0021] Further, eighty-nine limit blocks are slidably sleeved on the polished rod, and the eighty-nine limit blocks and eighty-eight driving levers are arranged alternately. A locking screw is also threadedly connected to each limit block.

[0022] Further, a limit plate is also provided on the top of the frame base, and a soundproof sheet is provided on the limit plate.

[0023] Further, the clamping mechanism includes a first L-shaped plate slidably assembled on the top of the main frame and a second L-shaped plate slidably assembled on the top of the first L-shaped plate;

[0024] A second T-shaped sliding groove is formed on the first L-shaped plate, a strip-shaped through hole is formed on the second L-shaped plate, a second bolt member is slidably inserted through the strip-shaped through hole, and the bottom end of the second bolt member is slidably clamped in the second T-shaped sliding groove. The second L-shaped plate can be locked by the female member of the second bolt member;

[0025] A strip-shaped counterbore is also formed on the first L-shaped plate, strip-shaped through holes are formed at both ends of the top of the main frame, a third bolt member is slidably inserted through the strip-shaped counterbore, and the third bolt member passes through the strip-shaped through hole. The main frame can be locked by the female member of the third bolt member.

[0026] Further, the sostenuto pedal driving device includes a hinge support, a pedal lever rotatably mounted on the hinge support, a sostenuto pedal provided at the bottom of one end of the pedal lever, a return spring provided at the bottom of the pedal lever and located between the sostenuto pedal and the hinge support, a second proportional electromagnet provided at the top of the other end of the pedal lever, and a lifting rod provided at the output shaft end of the second proportional electromagnet;

[0027] The lifting rod is used to be assembled on the damper lifter of the piano sostenuto system. When the second proportional electromagnet is energized, it will drive the lifting rod to rise to drive the damper lifter to complete sostenuto.

[0028] Adopting the above technical solutions, the present invention has the following beneficial effects:

[0029] 1. The overall structure of the driving device of the action of the present invention is arranged compactly, making full use of the space inside the piano. Different from the traditional automatic performance system, it does not damage the internal structure of the piano, and further extends the service life of the piano.

[0030] 2. The driving device of the action of the present invention is assembled on the main frame. The system can be easily installed by clamping on both sides of the piano through the clamping mechanisms at both ends. The installation is simple and convenient, with low technical requirements, and the position of the main frame can be adjusted, making it easier for the driving device of the action to be quickly adjusted in place.

[0031] 3. The key mechanism driving device of the present invention adopts eighty-eight electromagnetic driving mechanisms arranged in a staggered up-and-down manner, which fully saves the internal space, is arranged in an orderly manner, and is not prone to problems of dislocation and interference; moreover, each electromagnetic driving mechanism can finely adjust its position to accurately adapt to the sound production system of the piano, making the performance more accurate and smooth, and can also adapt to the internal structures of more styles and specifications of pianos.

[0032] 4. The key mechanism driving device of the present invention utilizes the resistance and gravity of the piano key mechanism body for resetting. The preferred driving lever is in torque balance in the initial state. The key mechanism driving device not only efficiently utilizes the electromagnetic force but also accurately simulates the reset mode of the piano keys themselves, thus making the automatic performance system closer to the real performance.

[0033] 5. The electromagnetic driving mechanism of the present invention uses a proportional electromagnet as the prime mover and is equipped with a magnetic insulation baffle to isolate the mutual influence between the electromagnets, making the control more precise and consistent during the overall automatic performance, ensuring the performance is more accurate and smooth, and the entire performance process is closer to the real piano performance.

[0034] 6. The sustain pedal driving device of the present invention only adds a proportional electromagnet to the existing sustain device. The overall installation is convenient and fast, does not occupy too much space, and is more precise and coordinated, with higher consistency when performing in cooperation with the electromagnetic driving mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic structural diagram of the present invention;

[0036] Figure 2 is an installation state diagram of the present invention;

[0037] Figure 3 is an assembly drawing of the key mechanism driving device and the adjusting frame body of the present invention;

[0038] Figure 4 is Figure 3 a schematic enlarged view of the structure of part A in

[0039] Figure 5 is a back view schematic diagram of the partial structure of the present invention;

[0040] Figure 6 is Figure 5 a schematic enlarged view of the structure of part B in

[0041] Figure 7 is a driving principle diagram of the electromagnetic driving mechanism of the present invention;

[0042] Figure 8 is an assembly schematic diagram of the clamping mechanism of the present invention;

[0043] Figure 9 is Figure 8Schematic cross-sectional view of the middle structure;

[0044] Figure 10 Schematic structural view of the sustain pedal drive device of the present invention;

[0045] Figure 11 is Figure 10 Enlarged schematic structural view of part C in [the figure];

[0046] Figure 12 is Figure 7 Enlarged force moment diagram of the structure of part D in [the figure];

[0047] Figure 13 Cross-sectional view of the drive lever of the present invention;

[0048] Wherein, 1. Adjusting frame body; 10. Main frame; 100. Slide rail frame; 1000. First T-shaped sliding groove; 101. Smooth rod; 102. Limit stop block; 1020. Locking screw; 103. Strip-shaped through hole; 11. Clamping mechanism; 110. First L-shaped plate; 1100. Second T-shaped sliding groove; 1101. Strip-shaped counterbore; 111. Second L-shaped plate; 1110. Strip-shaped perforation; 2. Action drive device; 20. Electromagnetic drive mechanism; 200. Frame seat; 201. First proportional electromagnet; 202. Hinge; 203. Connecting rod; 204. Drive lever; 2041. High-density metal material nickel-chromium alloy; 2042. Connecting screw; 2043. Low-density metal material aluminum alloy; 205. High-molecular wear-resistant strip; 206. Magnetic insulation baffle; 207. Limit plate; 208. Sound insulation sheet; 3. Sustain pedal drive device; 30. Hinge support; 31. Pedal lever; 32. Sustain pedal; 33. Return spring; 34. Second proportional electromagnet; 35. Lifting rod; 91. First bolt member; 92. Second bolt member; 93. Third bolt member; 104. Third L-shaped plate; 5. Piano body; 6. Strings; 70. Keys; 71. Stud; 72. Linkage lever; 73. Ejector spring; 74. Ejector rod; 75. Hammer rest; 76. Hammer; 77. Hammer head felt; 78. Stop block; 80. Damper lifter; 81. Lifting rod; 82. Wippen bracket; 83. Damper bracket; 84. Damper rod; 85. Damper felt; 86. Damper lifter rotating shaft. Detailed implementation manners

[0049] In order to make the content of the present invention be more clearly understood, the following further describes the present invention in detail according to specific embodiments in conjunction with the accompanying drawings.

[0050] As shown in Figures 1-13As shown in the figure, in this embodiment, an automatic playing system for an upright piano is provided, which includes an adjusting frame body 1, a hammer action driving device 2, a sustain pedal driving device 3, and a control module. The hammer action driving device 2 is adjustably assembled on the adjusting frame body 1 and is used to drive the sound production system of the piano, that is, to drive the hammer action of the piano to produce sound. The adjusting frame body 1 can be directly installed on both sides of the piano, and the adjusting frame body 1 can adjust the position of the hammer action driving device 2 to adapt to the sound production systems of different models of upright pianos. The sustain pedal driving device 3 can replace the original pedal and lifter structure of the upright piano. By directly installing it inside the piano and connecting it to the sustain system of the piano, it can drive the sustain system of the piano to sustain. The control module is electrically connected to the hammer action driving device 2 and the sustain pedal driving device 3, and can control the entire system to achieve automatic playing.

[0051] Specifically, the adjusting frame body 1 in this embodiment further includes a main frame 10 and two clamping mechanisms 11 slidably assembled at both ends of the top of the main frame 10. The hammer action driving device 2 is adjustably assembled on the main frame 10. During installation, the system can be easily installed by simply clamping the two clamping mechanisms 11 on both side plates of the piano body 5. The installation is simple and convenient, with low technical requirements, and the position of the main frame 10 can be adjusted, making it easier for the hammer action driving device 2 to be quickly adjusted in place.

[0052] In order to enable the hammer action driving device 2 to also finely adjust its position, two rail frames 100 arranged vertically are horizontally provided in the middle of the main frame 10 in this embodiment, and a smooth rod 101 is horizontally provided at the bottom of the main frame 10. The hammer action driving device 2 specifically includes eighty-eight electromagnetic driving mechanisms 20. The eighty-eight electromagnetic driving mechanisms 20 are arranged in two rows in a staggered manner up and down, and the top is slidably assembled on the two rail frames 100, while the bottoms of the eighty-eight electromagnetic driving mechanisms 20 are all rotatably connected to the smooth rod 101. The eighty-eight electromagnetic driving mechanisms 20 are located above the eighty-eight keys 70 and correspond to the eighty-eight hammer action mechanisms of the piano itself. During actual installation and adjustment, the position of each electromagnetic driving mechanism 20 can be finely adjusted to accurately adapt to the hammer action of the piano, thereby making the performance more accurate and smooth. At the same time, the eighty-eight electromagnetic driving mechanisms 20 are arranged in a compact and orderly manner, making full use of the space inside the piano and not easily prone to problems such as misalignment and interference.

[0053] Specifically, the electromagnetic drive mechanism 20 in this embodiment includes a frame base 200, a first proportional electromagnet 201, a hinge 202, a connecting rod 203, and a drive lever 204. The frame base 200 is slidably assembled on the slide rail frame 100. The first proportional electromagnet 201 is installed inside the frame base 200. A proportional electromagnet is a structure that linearly converts an input electrical signal into an output electromagnetic force. When energized, the output shaft rod in the middle can perform telescopic movement. The hinge 202 is provided at the output shaft end of the first proportional electromagnet 201. The connecting rod 203 is rotatably connected to the bottom end of the hinge 202. One end of the drive lever 204 is rotatably connected to the bottom end of the connecting rod 203, and the bottom of the drive lever 204 is rotatably installed on the optical rod 101, with the optical rod 101 serving as a fulcrum. During automatic performance, the chip (chip model: STM32f407) in the control module controls the driver to complete the amplification of the electrical signal to drive the corresponding first proportional electromagnet 201. The energization duration and current magnitude can be set in the control program. When the first proportional electromagnet 201 is energized, the middle shaft will drive the connecting rod 203 to press down one end of the drive lever 204. When the drive lever 204 rotates, the other end will touch and push the linkage lever 72 of the piano action. The action of a vertical piano is also composed of eighty-eight string striking mechanisms. Each string striking mechanism includes a key 70, a butt 71, a linkage lever 72, a jack spring 73, a jack 74, a hammer rest 75, a hammer 76, a hammer felt 77, and a check block 78. When playing manually, pressing the key 70 finally drives the hammer felt 77 to strike the string 6. Generally, the drive structure of an automatic performance device is basically installed below the key 70. This embodiment is different. It drives the sound production by touching and pushing the end of the linkage lever 72 with the drive lever 204. The design of the drive lever 204 maintains torque balance. Refer to Figure 13 in which the drive lever 204 is specifically composed of a high-density metal material nickel-chromium alloy 2041, a connecting screw 2042, and a low-density metal material aluminum alloy 2043. Refer to Figure 12 in which the drive lever 204 uses the central axis O of the optical rod 101 as the fulcrum to ensure torque balance F1×L1 = F2×L2 (where: F2 = the resultant force of the gravity of the iron core, hinge, connecting rod, and aluminum alloy in the first proportional electromagnet, F1 = the gravity of the nickel-chromium alloy). In this way, the driving force of pressing the key 70 can be simulated, enabling the automatic performance to be closer to the real performance effect. When powered off, the drive lever 204 is reset by the resistance and gravity of the action body, making the movement of the entire structure more reasonable. In addition, the end face contour of the contact end of the drive lever 204 is a curved surface and is designed to be an arc shape adapted to the linkage lever 72, making the impact point more reasonable. And a high-molecular wear-resistant strip 205 is provided at the contact end of the drive lever 204, ensuring the wear resistance while not damaging the action due to excessive hardness, and being able to maintain high-pair contact during movement to ensure the performance quality.

[0054] To isolate the mutual influence between the electromagnets, a magnetic insulation baffle 206 is further provided on one side of the frame base 200 in this embodiment to ensure the performance quality.

[0055] To prevent the driving lever 204 from sliding on the polished rod 101, eighty-nine limiting blocks 102 are slidably sleeved on the polished rod 101 in this embodiment, and the eighty-nine limiting blocks 102 and the eighty-eight driving levers 204 are arranged in an alternating manner. A locking screw 1020 is also threadedly connected to each limiting block 102, which is convenient for fine-tuning the position of the driving lever 204 after loosening.

[0056] To limit the intermediate shaft rod of the first proportional electromagnet 201, a limiting plate 207 is further provided on the top of the frame base 200 in this embodiment. A silent sheet 208 is provided at the bottom of the limiting plate 207 to prevent noise during limiting. After power-off, the driving lever 204 is reset by the resistance and gravity of the piano action. The output shaft rod of the first proportional electromagnet 201 will be pushed up. Due to inertia, without limitation, the driving lever 204 will swing back and forth and may touch the linkage lever 72 again, causing an impact. Therefore, the limiting plate 207 can well control the movement range of the intermediate shaft rod of the first proportional electromagnet 201, making the entire movement structure more reasonable.

[0057] Specifically, the electromagnetic driving mechanism 20 is slidably assembled on the slide rail frame 100 in the following way. A first T-shaped chute 1000 is provided at the top of the slide rail frame 100 in this embodiment. A first bolt member 91 is installed on the frame base 200. The first bolt member 91 includes a screw and a nut. The bottom end of the first bolt member 91 is slidably clamped in the first T-shaped chute 1000, that is, the screw is inverted and the large head is slidably clamped in the first T-shaped chute 1000, and the frame base 200 can be locked from above through the nut of the first bolt member 91.

[0058] Specifically, the clamping mechanism 11 in this embodiment includes a first L-shaped plate 110 and a second L-shaped plate 111. The first L-shaped plate 110 is slidably assembled at one end of the top of the main frame 10, and the second L-shaped plate 111 is slidably assembled on the top of the first L-shaped plate 110. More specifically, a second T-shaped sliding groove 1100 is formed on the first L-shaped plate 110, and a strip-shaped through hole 1110 is formed on the second L-shaped plate 111. A second bolt member 92 is slidably inserted through the strip-shaped through hole 1110, and the bottom end of the second bolt member 92 is slidably clamped in the second T-shaped sliding groove 1100. The second bolt member 92 also includes a screw and a nut. Just turn the screw upside down and slide the large head into the second T-shaped sliding groove 1100. Loosen the second bolt member 92 and adjust the distance between the second L-shaped plate 111 and the first L-shaped plate 110 to complete the clamping. Finally, lock it from above through the nut of the second bolt member 92. Of course, in order to make the installation more stable, a plurality of third L-shaped plates 104 are also provided on both sides of the main frame 10, which can be fixed to the two side plates of the piano body 5. More specifically, a strip-shaped counterbore 1101 is formed on the first L-shaped plate 110, and corresponding strip-shaped through holes 103 are formed at both ends of the top of the main frame 10. A third bolt member 93 is slidably inserted through the strip-shaped counterbore 1101, and the third bolt member 93 passes through the strip-shaped through hole 103. The main frame 10 can be locked from below through the female member of the third bolt member 93.

[0059] Specifically, the sustain pedal driving device 3 in this embodiment includes a hinge support 30, a pedal lever 31, a sustain pedal 32, a return spring 33, a second proportional electromagnet 34, and a lift rod 35. The pedal lever 31 is rotatably installed on the hinge support 30. The sustain pedal 32 is arranged at the bottom of one end of the pedal lever 31. The return spring 33 is arranged at the bottom of the pedal lever 31 and is located between the sustain pedal 32 and the hinge support 30. The second proportional electromagnet 34 is arranged at the top of the other end of the pedal lever 31. The lift rod 35 is arranged at the upper end of the output central axis of the second proportional electromagnet 34. During specific installation, for convenience, the original pedal and lift structure of the upright piano can be directly replaced. The sustain pedal driving device 3 in this embodiment installs the hinge support 30, the sustain pedal 32, and the return spring 33 at the bottom of the piano, installs the second proportional electromagnet 34 on the side plate of the piano, and connects and installs the lift rod 35 to the damper lift 80 of the sustain system. The sustain system of a traditional upright piano includes a damper lift 80, a lift rod 81, a hammer rest rail 82, a damper rail 83, a damper rod 84, a damper felt 85, and a damper lift rotating shaft 86. When automatic sustain is required for automatic performance, the control module controls the second proportional electromagnet 34 to be energized. The central shaft of the second proportional electromagnet 34 will drive the lift rod 35 to rise, pushing one end of the damper lift 80 upward and rotating around the damper lift rotating shaft 86. The other end of the damper lift 80 drives the lift rod 81 to rotate clockwise. The lift rod 81 is in line contact with the bottom end of the sustain rod 84. Therefore, the clockwise rotation of the lift rod 81 will cause the damper rod 84 to rotate, and then drive the damper felt 85 at the upper end to separate from the strings 6, thus achieving the automatic sustain effect. Of course, the sustain pedal driving device 3 in this embodiment also has the function of pedal sustain. Specifically, it is the same as the existing pedal sustain, except that the sustain pedal driving device 3 can not only achieve automatic sustain but also retain the original pedal sustain. Specifically, it is achieved through the second proportional electromagnet 34. Since the central shaft rod of the proportional electromagnet can move freely, it can well achieve the two functions of automatic and pedal. The sustain pedal driving device 3 in this embodiment is installed conveniently and quickly, does not occupy too much space, and is more precise and coordinated when performing in cooperation with the electromagnetic driving mechanism 20, with higher consistency.

[0060] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0061] In the above specific embodiments, the technical problems solved by the present invention, the technical solutions and the beneficial effects have been further described in detail. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automatic playing system for an upright piano, characterized in that: it includes an adjusting frame body (1), a hammer action driving device (2), a sustain pedal driving device (3) and a control module; the hammer action driving device (2) is adjustably assembled on the adjusting frame body (1) and is used to drive the piano sound production system to produce sound; the adjusting frame body (1) is used to be installed on both sides of the piano, and the adjusting frame body (1) can adjust the position of the hammer action driving device (2) to adapt to different models of upright pianos; the sustain pedal driving device (3) is used to be installed inside the piano and connected to the piano sustain system, and the sustain pedal driving device (3) can drive the piano sustain system to sustain; the control module is electrically connected to the hammer action driving device (2) and the sustain pedal driving device (3); the sustain pedal driving device (3) includes a hinge support (30), a pedal lever (31) rotatably installed on the hinge support (30), a sustain pedal (32) arranged at the bottom of one end of the pedal lever (31), a return spring (33) arranged at the bottom of the pedal lever (31) and located between the sustain pedal (32) and the hinge support (30), a second proportional electromagnet (34) arranged at the top of the other end of the pedal lever (31), and a lift rod (35) arranged at the output shaft end of the second proportional electromagnet (34); the lift rod (35) is used to be assembled on the damper lift of the piano sustain system, and when the second proportional electromagnet (34) is energized, it will drive the lift rod (35) to rise to drive the damper lift to complete the sustain.

2. The automatic playing system for an upright piano according to claim 1, characterized in that: the adjusting frame body (1) includes a main frame (10) and two clamping mechanisms (11) slidably assembled at both ends of the top of the main frame (10); the two clamping mechanisms (11) are used to clamp on both side plates of the piano, and the hammer action driving device (2) is adjustably assembled on the main frame (10).

3. The automatic playing system for an upright piano according to claim 2, characterized in that: two slide rail frames (100) are horizontally arranged up and down in the middle of the main frame (10), and a smooth rod (101) is horizontally arranged at the bottom of the main frame (10); the hammer action driving device (2) includes eighty-eight electromagnetic driving mechanisms (20), the tops of the eighty-eight electromagnetic driving mechanisms (20) are staggered up and down and slidably assembled on the two slide rail frames (100), and the bottoms of the eighty-eight electromagnetic driving mechanisms (20) are all rotatably connected to the smooth rod (101).

4. The automatic playing system for an upright piano according to claim 3, characterized in that: The electromagnetic drive mechanism (20) includes a frame base (200) slidably assembled on a slide rail frame (100), a first proportional electromagnet (201) installed in the frame base (200), a hinge (202) provided at the output shaft end of the first proportional electromagnet (201), a connecting rod (203) rotatably connected to the bottom end of the hinge (202), and a drive lever (204) rotatably connected to the bottom end of the connecting rod (203) and rotatably mounted on a smooth rod (101); When the first proportional electromagnet (201) is energized, it drives the connecting rod (203) to press down one end of the drive lever (204). When the drive lever (204) rotates, the other end forms a kinematic higher pair contact with the linkage lever of the piano action, thereby pushing the linkage lever of the piano action to move upward; The end face contour of the contact end of the drive lever (204) is a curved surface and is in an arc shape adapted to the linkage lever, and a high molecular wear-resistant strip (205) is provided at the contact end of the drive lever (204).

5. The automatic playing system for an upright piano according to claim 4, wherein: A first T-shaped chute (1000) is provided at the top of the slide rail frame (100). A first bolt member (91) is installed on the frame base (200). The bottom end of the first bolt member (91) is slidably clamped in the first T-shaped chute (1000), and the frame base (200) can be locked by the nut of the first bolt member (91).

6. The automatic playing system for an upright piano according to claim 4, wherein: A magnetic insulation baffle (206) is further provided on one side of the frame base (200).

7. The automatic playing system for an upright piano according to claim 4, wherein: Eighty-nine limit blocks (102) are slidably sleeved on the smooth rod (101), and the eighty-nine limit blocks (102) and the eighty-eight drive levers (204) are arranged alternately. A locking screw (1020) is also threadedly connected to each limit block (102).

8. The automatic playing system for an upright piano according to claim 4, wherein: A limit plate (207) is further provided on the top of the frame base (200), and a silent sheet (208) is provided on the limit plate (207).

9. The automatic playing system for an upright piano according to claim 2, wherein: The clamping mechanism (11) includes a first L-shaped plate (110) slidably assembled on the top of the main frame (10) and a second L-shaped plate (111) slidably assembled on the top of the first L-shaped plate (110); A second T-shaped chute (1100) is provided on the first L-shaped plate (110). A strip-shaped through hole (1110) is provided on the second L-shaped plate (111). A second bolt member (92) is slidably inserted through the strip-shaped through hole (1110), and the bottom end of the second bolt member (92) is slidably clamped in the second T-shaped chute (1100). The second L-shaped plate (111) can be locked by the nut of the second bolt member (92). A strip-shaped counterbore (1101) is further formed in the first L-shaped plate (110). Strip-shaped through holes (103) are formed at both ends of the top of the main frame (10). A third bolt member (93) is slidably inserted through the strip-shaped counterbore (1101), and the third bolt member (93) passes through the strip-shaped through hole (103). The main frame (10) can be locked by the female member of the third bolt member (93).

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