CN113142796A - Music book placing device for music teaching - Google Patents
Music book placing device for music teaching Download PDFInfo
- Publication number
- CN113142796A CN113142796A CN202110518792.1A CN202110518792A CN113142796A CN 113142796 A CN113142796 A CN 113142796A CN 202110518792 A CN202110518792 A CN 202110518792A CN 113142796 A CN113142796 A CN 113142796A
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- Prior art keywords
- music
- motor
- arm
- rotating
- placing device
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Classifications
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B19/00—Reading-desks; Lecterns; Pulpits, i.e. free-standing
- A47B19/002—Free-standing music stands
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B19/00—Reading-desks; Lecterns; Pulpits, i.e. free-standing
- A47B19/10—Reading-desks; Lecterns; Pulpits, i.e. free-standing characterised by association with auxiliary devices, e.g. paper clamps, line indicators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D9/00—Bookmarkers; Spot indicators; Devices for holding books open; Leaf turners
- B42D9/04—Leaf turners
- B42D9/06—Leaf turners having an arm reset after each operation
Landscapes
- Tables And Desks Characterized By Structural Shape (AREA)
Abstract
The invention relates to a music book placing device for music teaching, which comprises a base, foot switches, a supporting arm and a placing table, wherein the top of the base is provided with a plurality of foot switches, the top of the base is connected with the bottom end of the supporting arm, and the top end of the supporting arm is rotatably provided with the placing table; second motor work, first rocking arm is rotatory this moment, sucking disc and the music book contact until second rocking arm bottom, the connecting pipe that the sucking disc is connected this moment removes including the inslot, the end links move in step on the guide arm, the music book contact of sucking disc and different thickness is guaranteed to elastic deformation through the spring, miniature air pump work produces the negative pressure in the sucking disc this moment, realize the absorption of sucking disc and music book, and it is rotatory to drive the second rocking arm through fourth motor work, and then the angle of adjustment sucking disc, realize adsorbing with the music book of different angles, and then realize adsorbing the music book of different angles of putting and thickness, and 180 rotations through the second rocking arm, realize that the both sides of music book turn over the page respectively.
Description
Technical Field
The invention relates to the technical field of music teaching, in particular to a music book placing device for music teaching.
Background
The music teaching is mainly applied to methods of exercise, demonstration, appreciation, lecture and explanation, question and answer and review, wherein music scores are indispensable in the teaching process.
The existing music score placing device is a placing frame and is only used for placing a music score, in the process of playing a musical instrument, the music score needs to be continuously turned over, and at the moment, when the music score is turned over by hands, the playing is easily interrupted, and the playing effect is influenced.
Disclosure of Invention
The invention aims to provide a music score placing device for music teaching, and solves the technical problems that the existing music score placing device is a placing frame and is only used for placing music scores, the music scores need to be continuously turned during the process of playing musical instruments, and the playing is easily interrupted and the playing effect is influenced when the pages are turned by hands.
In order to achieve the purpose, the invention adopts the following technical scheme:
a music book placing device for music teaching comprises a base, foot switches, a supporting arm and a placing table, wherein the plurality of foot switches are installed at the top of the base;
put platform top center department and install the mounting panel, the mounting panel bottom side rotates the installation with first rocking arm one end, the side bearer is installed to the first rocking arm other end, the inside slidable mounting of side bearer has the digging arm, digging arm outer end top side rotates installs the second rocking arm, miniature air pump is installed in the second rocking arm outside, the inside groove of having seted up of second rocking arm outer end, and inside groove and miniature air pump switch-on connection, inside groove slidable mounting has the connecting pipe, connecting pipe one end is located the second rocking arm outside and sucking disc switch-on connection.
Preferably, the number of the foot switches is 5, and the 5 foot switches are respectively electrically connected with the first motor, the second motor, the third motor, the fourth motor and the micro air pump.
Preferably, fixed ear is installed on the support arm top, put the platform lateral wall and install the commentaries on classics ear, and the commentaries on classics ear rotates and installs in fixed ear.
Preferably, a first motor is installed outside the fixed lug, the first motor output end runs through the fixed lug and the rotary lug, the first motor output end is connected with the fixed lug bearing, and the first motor output end is fixedly connected with the rotary lug.
Preferably, the second motor is installed at the mounting panel top, the second motor output runs through the mounting panel and is connected with first bull arm one end.
Preferably, the side frame is U-shaped, the side wall of the side frame is provided with a sliding rail, the top end of the side frame is provided with a third motor, the output end of the third motor is provided with a threaded rod, and two ends of the threaded rod are connected with the side frame bearing.
Preferably, the inner end of the movable arm is provided with a sliding seat, the sliding seat is in threaded connection with the threaded rod, and the sliding seat is slidably mounted on the sliding rail.
Preferably, a fourth motor is installed at the top of the outer end of the movable arm, and the output end of the fourth motor penetrates through the movable arm and is connected with the top end of the second rotating arm.
Preferably, an end ring is arranged on the outer side of the top end of the connecting pipe, guide rods are symmetrically arranged in the inner groove and penetrate through the end ring, and a spring is sleeved on the outer side of each guide rod and above the end ring.
Preferably, the music score placing device comprises the following specific operation steps:
the method comprises the following steps: the music book is placed on the placing table, the limiting effect is achieved through the baffle plate, the first motor works at the moment through pressing the pedal switch corresponding to the base, the rotating lugs are driven to rotate in the fixing lugs, and the placing table is rotated;
step two: the second motor works, the first rotating arm rotates at the moment until a sucker at the bottom end of the second rotating arm is contacted with the music book, the connecting pipe connected with the sucker moves in the inner groove at the moment, the end ring synchronously moves on the guide rod, the sucker is ensured to be contacted with the music books with different thicknesses through the elastic deformation of the spring, and the miniature air pump works in the sucker to generate negative pressure so as to realize the adsorption of the sucker and the music books;
step three: at the moment, the first rotating arm rotates to turn pages of the music book, after the page turning is finished, a third motor on the side frame works to drive a threaded rod to rotate, and then a sliding seat in threaded connection drives a movable arm to move upwards until the bottom end of the second rotating arm moves to the position above the music book, and at the moment, after the first rotating arm rotates, the movable arm moves downwards to perform the page turning operation again;
step four: and the fourth motor works to drive the second rotating arm to rotate, so that the angle of the sucker is adjusted, the sucker is adsorbed with music scores at different angles, and meanwhile, pages are turned on at two sides of the music scores respectively.
The invention has the beneficial effects that: the second motor works, the first rotating arm rotates at the moment until a sucker at the bottom end of the second rotating arm is contacted with the music score, a connecting pipe connected with the sucker moves in an inner groove at the moment, an end ring synchronously moves on the guide rod, the sucker is ensured to be contacted with the music scores with different thicknesses through elastic deformation of a spring, at the moment, the miniature air pump works to generate negative pressure in the sucker, the sucker is adsorbed with the music score, the second rotating arm is driven to rotate through the work of a fourth motor, the angle of the sucker is further adjusted, the music score is adsorbed with different angles, the music scores with different placing angles and thicknesses are further adsorbed, and the two sides of the music score are respectively turned through 180-degree rotation of the second rotating arm;
the page turning of the music book is realized through the rotation of the first rotating arm, after the page turning is completed, the third motor on the side frame works to drive the threaded rod to rotate, then the sliding seat connected through threads drives the movable arm to move upwards, the movable arm moves to the top of the music book until the bottom end of the second rotating arm moves, at the moment, after the first rotating arm rotates, the movable arm moves downwards to perform the page turning operation again, the repeated operation is realized, the manual page turning of the music book is not needed, the normal teaching is ensured, and the interruption of playing is avoided.
Drawings
FIG. 1 is a schematic view of an overall side structure of the present invention;
FIG. 2 is another schematic view of the overall structure of the present invention;
FIG. 3 is an overall side view of the present invention;
fig. 4 is a partial cross-sectional view of the second rotating arm of the present invention.
Illustration of the drawings:
1. a base; 2. a foot switch; 3. a support arm; 4. fixing the ear; 5. a placing table; 6. ear turning; 7. a first motor; 8. a baffle plate; 9. mounting a plate; 10. a second motor; 11. a first rotating arm; 12. a side frame; 13. a third motor; 14. a threaded rod; 15. a movable arm; 16. a slide base; 17. a fourth motor; 18. a second rotating arm; 19. a micro air pump; 20. a suction cup; 21. an inner tank; 22. a guide bar; 23. a spring; 24. a connecting pipe; 25. and an end ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Specific examples are given below.
Referring to fig. 1-4, a music book placing device for music teaching comprises a base 1, foot switches 2, a supporting arm 3 and a placing table 5, wherein the top of the base 1 is provided with a plurality of foot switches 2, the top of the base 1 is connected with the bottom end of the supporting arm 3, the top end of the supporting arm 3 is rotatably provided with the placing table 5, and the bottom of the placing table 5 is provided with a baffle plate 8;
the mounting plate 9 is installed at the center of the top end of the placing table 5, the bottom side of the mounting plate 9 is rotatably installed with one end of the first rotating arm 11, the side frame 12 is installed at the other end of the first rotating arm 11, the movable arm 15 is slidably installed inside the side frame 12, the top side of the outer end of the movable arm 15 is rotatably installed with the second rotating arm 18, the micro air pump 19 is installed on the outer side of the second rotating arm 18, the inner groove 21 is formed inside the outer end of the second rotating arm 18, the inner groove 21 is in conduction connection with the micro air pump 19, the connecting pipe 24 is slidably installed in the inner groove 21, and one end of the connecting pipe 24 is located on the outer side of the second rotating arm 18 and is in conduction connection with the suction cup 20.
In one embodiment of the present invention, the number of the foot switches 2 is 5, and the 5 foot switches 2 are electrically connected to the first motor 7, the second motor 10, the third motor 13, the fourth motor 17 and the micro air pump 19 respectively, and are controlled by the foot switches 2 respectively.
As an embodiment of the invention, a fixing lug 4 is installed at the top end of a supporting arm 3, a rotating lug 6 is installed on the side wall of a placing table 5, the rotating lug 6 is rotatably installed in the fixing lug 4, a first motor 7 is installed on the outer side of the fixing lug 4, the output end of the first motor 7 penetrates through the fixing lug 4 and the rotating lug 6, the output end of the first motor 7 is in bearing connection with the fixing lug 4, the output end of the first motor 7 is fixedly connected with the rotating lug 6, and the first motor 7 works to further drive the rotating lug 6 to rotate in the fixing lug 4 so as to rotate the placing table 5.
As an embodiment of the invention, a second motor 10 is mounted on the top of the mounting plate 9, the output end of the second motor 10 penetrates through the mounting plate 9 and is connected with one end of a first rotating arm 11, and the second motor 10 works to drive the first rotating arm 11 to rotate.
As an embodiment of the invention, the side frame 12 is U-shaped, the side wall of the side frame 12 is provided with a slide rail, the top end of the side frame 12 is provided with a third motor 13, the output end of the third motor 13 is provided with a threaded rod 14, two ends of the threaded rod 14 are in bearing connection with the side frame 12, the inner end of the movable arm 15 is provided with a slide seat 16, the slide seat 16 is in threaded connection with the threaded rod 14, the slide seat 16 is slidably mounted on the slide rail, the third motor 13 on the side frame 12 works to drive the threaded rod 14 to rotate, and the slide seat 16 in threaded connection drives the movable arm 15 to move.
As an embodiment of the invention, a fourth motor 17 is mounted on the top of the outer end of the movable arm 15, the output end of the fourth motor 17 penetrates through the movable arm 15 and is connected with the top end of the second rotating arm 18, and the fourth motor 17 is operated to drive the second rotating arm 18 to rotate, thereby adjusting the angle of the suction cup 20.
In one embodiment of the present invention, an end ring 25 is provided on the outer side of the top end of the connecting tube 24, guide rods 22 are symmetrically installed in the inner groove 21, the guide rods 22 penetrate through the end ring 25, a spring 23 is sleeved on the outer side of the guide rods 22 and above the end ring 25, the connecting tube 24 connected with the suction cup 20 moves in the inner groove 21, the end ring 25 moves synchronously on the guide rods 22, and the suction cup 20 is ensured to contact music scores with different thicknesses through the elastic deformation of the spring 23.
As an embodiment of the present invention, the music score placing device specifically comprises the following operation steps:
the method comprises the following steps: placing a music score on a placing table 5, wherein the music score is limited by a baffle 8, and the first motor 7 works by pressing the foot switch 2 corresponding to the base 1, so that the rotating lug 6 is driven to rotate in the fixed lug 4, and the placing table 5 rotates;
step two: the second motor 10 works, at this time, the first rotating arm 11 rotates until the sucking disc 20 at the bottom end of the second rotating arm 18 contacts with the music score, at this time, the connecting pipe 24 connected with the sucking disc 20 moves in the inner groove 21, the end ring 25 moves synchronously on the guide rod 22, the sucking disc 20 is ensured to contact with the music scores with different thicknesses through the elastic deformation of the spring 23, at this time, the micro air pump 19 works in the sucking disc 20 to generate negative pressure, and the sucking disc 20 and the music score are adsorbed;
step three: at the moment, the first rotating arm 11 rotates to turn pages of the music book, after the page turning is finished, the third motor 13 on the side frame 12 works to drive the threaded rod 14 to rotate, and then the sliding seat 16 connected with the threaded rod drives the movable arm 15 to move upwards until the bottom end of the second rotating arm 18 moves to the position above the music book, and at the moment, after the first rotating arm 11 rotates, the movable arm 15 moves downwards to perform the page turning operation again;
step four: and the fourth motor 17 is operated to drive the second rotating arm 18 to rotate, so as to adjust the angle of the sucker 20, realize the adsorption with music scores with different angles, and simultaneously facilitate the realization of the respective page turning on two sides of the music score.
The second motor 10 works, at this time, the first rotating arm 11 rotates until the sucker 20 at the bottom end of the second rotating arm 18 contacts with the music score, at this time, the connecting pipe 24 connected with the sucker 20 moves in the inner groove 21, the end ring 25 synchronously moves on the guide rod 22, the sucker 20 is ensured to contact with the music scores with different thicknesses through the elastic deformation of the spring 23, at this time, the miniature air pump 19 works in the sucker 20 to generate negative pressure, so that the sucker 20 is adsorbed with the music scores, the fourth motor 17 works to drive the second rotating arm 18 to rotate, so that the angle of the sucker 20 is adjusted, the music scores with different angles are adsorbed, so that the music scores with different placement angles and thicknesses are adsorbed, and the two sides of the music scores are respectively turned through 180-degree rotation of the second rotating arm 18;
the page turning of the music book is realized through the rotation of the first rotating arm 11, after the page turning is completed, the third motor 13 on the side frame 12 works to drive the threaded rod 14 to rotate, the sliding seat 16 connected through threads drives the movable arm 15 to move upwards until the bottom end of the second rotating arm 18 moves to the top of the music book, at the moment, after the first rotating arm 11 rotates, the movable arm 15 moves downwards to perform the page turning operation again, the repeated operation is performed, the manual page turning of the music book is not needed, the normal teaching is ensured, and the interruption of playing is avoided.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The music book placing device for music teaching is characterized by comprising a base (1), foot switches (2), a supporting arm (3) and a placing table (5), wherein the plurality of foot switches (2) are installed at the top of the base (1), the top of the base (1) is connected with the bottom end of the supporting arm (3), the placing table (5) is rotatably installed at the top end of the supporting arm (3), and a baffle (8) is arranged at the bottom of the placing table (5);
mounting panel (9) are installed in putting platform (5) top center department, mounting panel (9) bottom side rotates with first rocking arm (11) one end and installs, side bearer (12) are installed to first rocking arm (11) other end, side bearer (12) inside slidable mounting has digging arm (15), second rocking arm (18) are installed in the rotation of digging arm (15) outer end top side, miniature air pump (19) are installed in second rocking arm (18) outside, inside groove (21) have been seted up in second rocking arm (18) outer end, and inside groove (21) and miniature air pump (19) turn-on connection, inside groove (21) slidable mounting has connecting pipe (24), connecting pipe (24) one end is located second rocking arm (18) outside and sucking disc (20) turn-on connection.
2. The music book placing device for music teaching of claim 1, wherein the number of the foot switches (2) is 5, and the 5 foot switches (2) are electrically connected to the first motor (7), the second motor (10), the third motor (13), the fourth motor (17) and the micro air pump (19) respectively.
3. The music book placing device for music teaching of claim 1, wherein the top end of the supporting arm (3) is provided with a fixing ear (4), the side wall of the placing table (5) is provided with a rotating ear (6), and the rotating ear (6) is rotatably arranged in the fixing ear (4).
4. The music book placing device for music teaching of claim 3, wherein the first motor (7) is installed outside the fixing lug (4), the output end of the first motor (7) penetrates through the fixing lug (4) and the rotating lug (6), the output end of the first motor (7) is in bearing connection with the fixing lug (4), and the output end of the first motor (7) is fixedly connected with the rotating lug (6).
5. Device is put with music book to music teaching of claim 1, characterized in that, second motor (10) is installed at the top of mounting panel (9), the output end of second motor (10) runs through mounting panel (9) and is connected with one end of first rocking arm (11).
6. The music book placing device for music teaching of claim 1, wherein the side frame (12) is U-shaped, the side wall of the side frame (12) is provided with a slide rail, the top end of the side frame (12) is provided with a third motor (13), the output end of the third motor (13) is provided with a threaded rod (14), and two ends of the threaded rod (14) are in bearing connection with the side frame (12).
7. Music book placing device for music teaching according to claim 1, characterized in that the inner end of the movable arm (15) is provided with a sliding seat (16), the sliding seat (16) is in threaded connection with the threaded rod (14), and the sliding seat (16) is slidably mounted on a sliding rail.
8. The music book placing device for music teaching of claim 1, wherein a fourth motor (17) is installed at the top of the outer end of the movable arm (15), and the output end of the fourth motor (17) penetrates through the movable arm (15) to be connected with the top end of the second rotating arm (18).
9. The music book placing device for music teaching of claim 1, wherein an end ring (25) is arranged on the outer side of the top end of the connecting pipe (24), the inner groove (21) is internally and symmetrically provided with the guide rods (22), the guide rods (22) penetrate through the end ring (25), and a spring (23) is sleeved on the outer side of the guide rods (22) and above the end ring (25).
10. The music score placing device for music teaching of any one of claims 1-9, wherein the music score placing device has the following specific operation steps:
the method comprises the following steps: placing a music score on a placing table (5), limiting through a baffle (8), and pressing a foot switch (2) corresponding to a base (1) to realize the work of a first motor (7) and further drive a rotating lug (6) to rotate in a fixed lug (4) to realize the rotation of the placing table (5);
step two: the second motor (10) works, the first rotating arm (11) rotates at the moment until a sucker (20) at the bottom end of the second rotating arm (18) is contacted with a music score, a connecting pipe (24) connected with the sucker (20) moves in the inner groove (21), an end ring (25) synchronously moves on the guide rod (22), the sucker (20) is ensured to be contacted with music scores with different thicknesses through the elastic deformation of a spring (23), and the miniature air pump (19) works in the sucker (20) to generate negative pressure so as to realize the adsorption of the sucker (20) and the music score;
step three: at the moment, the first rotating arm (11) rotates to turn pages of the music score, after the page turning is finished, a third motor (13) on the side frame (12) works to drive a threaded rod (14) to rotate, and then a sliding seat (16) in threaded connection drives a movable arm (15) to move upwards until the bottom end of a second rotating arm (18) moves to the position above the music score, and at the moment, after the first rotating arm (11) rotates, the movable arm (15) moves downwards to perform the page turning operation again;
step four: and the fourth motor (17) works to drive the second rotating arm (18) to rotate, so that the angle of the sucker (20) is adjusted, the adsorption with music scores at different angles is realized, and meanwhile, the pages are turned on the two sides of the music scores respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110518792.1A CN113142796A (en) | 2021-05-12 | 2021-05-12 | Music book placing device for music teaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110518792.1A CN113142796A (en) | 2021-05-12 | 2021-05-12 | Music book placing device for music teaching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113142796A true CN113142796A (en) | 2021-07-23 |
Family
ID=76875128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110518792.1A Withdrawn CN113142796A (en) | 2021-05-12 | 2021-05-12 | Music book placing device for music teaching |
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| Country | Link |
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| CN (1) | CN113142796A (en) |
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|---|---|---|---|---|
| US20040107612A1 (en) * | 2002-12-05 | 2004-06-10 | Nam Su Jung | Apparatus for automatically turning page of book |
| CN204808864U (en) * | 2015-08-13 | 2015-11-25 | 黑河学院 | Piano performance music stand |
| CN108198544A (en) * | 2018-02-18 | 2018-06-22 | 无锡市翱宇特新科技发展有限公司 | A kind of music book display device with automatic page turning function |
| CN208216338U (en) * | 2018-05-02 | 2018-12-11 | 湖南人文科技学院 | Vocal music page-turning apparatus for music book |
| CN109998278A (en) * | 2019-05-10 | 2019-07-12 | 黄河科技学院 | A kind of portable spool music easel |
| CN211308013U (en) * | 2019-10-25 | 2020-08-21 | 曹译心 | Music teaching is supplementary with music book automatic page turning device |
| CN112026399A (en) * | 2020-08-24 | 2020-12-04 | 聊城大学 | Automatic page turning device and method for piano music book |
-
2021
- 2021-05-12 CN CN202110518792.1A patent/CN113142796A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040107612A1 (en) * | 2002-12-05 | 2004-06-10 | Nam Su Jung | Apparatus for automatically turning page of book |
| CN204808864U (en) * | 2015-08-13 | 2015-11-25 | 黑河学院 | Piano performance music stand |
| CN108198544A (en) * | 2018-02-18 | 2018-06-22 | 无锡市翱宇特新科技发展有限公司 | A kind of music book display device with automatic page turning function |
| CN208216338U (en) * | 2018-05-02 | 2018-12-11 | 湖南人文科技学院 | Vocal music page-turning apparatus for music book |
| CN109998278A (en) * | 2019-05-10 | 2019-07-12 | 黄河科技学院 | A kind of portable spool music easel |
| CN211308013U (en) * | 2019-10-25 | 2020-08-21 | 曹译心 | Music teaching is supplementary with music book automatic page turning device |
| CN112026399A (en) * | 2020-08-24 | 2020-12-04 | 聊城大学 | Automatic page turning device and method for piano music book |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210723 |
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| WW01 | Invention patent application withdrawn after publication |