Adjustable pressure head mechanism of piano soundboard frame pressing device

Abstract

The utility model discloses an adjustable pressing head mechanism of a piano soundboard frame pressing device, which comprises a liftable lower pressing rod, a lower pressing head is arranged at the lower end of the lower pressing rod, a pressing block is arranged at the lower end of the lower pressing head, and the pressing block is correspondingly pressed on a soundboard frame when the pressing block moves downwards along with the lower pressing rod; the lower pressing head is rotationally matched with the lower pressing rod, the pressing block is eccentrically arranged at the lower end of the lower pressing head, and when the lower pressing head rotates around the lower pressing rod, the pressing position of the pressing block is changed; a balance column is arranged at the lower end of the lower pressing head, and the pressing block and the balance column are symmetrically arranged with the lower pressing rod as the center. And when the pressing block is pressed on the soundboard frame, the balance column is correspondingly erected on a workbench on which the soundboard is placed. The lower pressing head comprises a cross beam, a pressing block is fixedly arranged at one end of the cross beam, and a balance column is movably arranged at the other end of the cross beam, so that the relative height of the balance column and the cross beam is adjustable. The piano soundboard frame pressing device can change the pressing position of the pressing block and is suitable for piano soundboard frames of different specifications.

Description

Technical Field

[0001] The utility model relates to the technical field of pianos, in particular to an adjustable pressing head mechanism of a piano soundboard frame pressing device. Background Art

[0002] During the processing of the piano soundboard, the soundboard frame needs to be fixed to the soundboard body by bonding. In order to make the soundboard frame fit tightly against the soundboard body, a pressing device is often used to press the soundboard frame. The soundboard frame pressing device is usually composed of a plurality of vertical cylinders arranged in an array, and the output rods of the cylinders are pressed on the soundboard frame accordingly when they move downward. However, in the existing soundboard frame pressing device, the position of the cylinder is fixed, resulting in that this type of soundboard frame pressing device can only be applied to one specification of piano soundboard frame, and has low versatility. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides an adjustable pressure head mechanism for a piano soundboard frame pressing device, which can change the pressing position and can be applicable to piano soundboard frames of different specifications.

[0004] Technical solution: To achieve the above-mentioned purpose, the utility model provides an adjustable pressure head mechanism of a piano soundboard frame pressing device, including a liftable lower pressure rod, a lower pressure head is provided at the lower end of the lower pressure rod, and a pressure block is provided at the lower end of the lower pressure head. When the lower pressure rod moves downward, the pressure block is pressed on the soundboard frame accordingly; the lower pressure head and the lower pressure rod are rotated together, and the pressure block is eccentrically arranged at the lower end of the lower pressure head. When the lower pressure head rotates around the lower pressure rod, the downward pressing position of the pressure block is changed.

[0005] Furthermore, a balance column is provided at the lower end of the pressing head, and the pressing block and the balance column are respectively located on both sides of the pressing rod; when the pressing block is pressed on the soundboard frame, the balance column stands correspondingly on the workbench where the soundboard is placed.

[0006] Furthermore, the pressing block and the balancing column are symmetrically arranged with the lower pressing rod as the center.

[0007] Furthermore, the lower pressure head comprises a cross beam, the pressure block is fixedly arranged at one end of the cross beam, and the balance column is movably arranged at the other end of the cross beam, so that the relative height between the balance column and the cross beam is adjustable.

[0008] Furthermore, the pressing head includes a sleeve, which is rotatably mounted on the lower end of the pressing rod and is hingedly matched with the middle part of the beam; a telescopic spring is arranged on the balancing column, and one end of the beam close to the balancing column is pressed on the balancing column through the telescopic spring.

[0009] Furthermore, a guide hole is provided on the crossbeam, and the balance column is located in the guide hole and slidably cooperates with the guide hole; a threaded section is provided on the balance column, and an adjusting nut is threadedly cooperated with the threaded section of the balance column; the telescopic spring is sleeved on the balance column, the upper end of the telescopic spring abuts the crossbeam, and the lower end of the telescopic spring abuts the adjusting nut, and the deformation degree of the telescopic spring is adjusted when the adjusting nut rotates on the threaded section.

[0010] Furthermore, a pointer is provided on the crossbeam, and when the pointer is vertical, the crossbeam is correspondingly in a horizontal state.

[0011] Beneficial effects: The adjustable pressing head mechanism of the piano soundboard frame pressing device of the utility model has the following beneficial effects:

[0012] 1) A rotatable pressing head is provided at the lower end of the pressing rod, and an eccentrically arranged pressing block is provided at the lower end of the pressing head. The pressing position of the pressing block can be changed by rotating the pressing head to adapt to piano soundboard frames of different specifications, thereby improving the versatility of the piano soundboard frame pressing device;

[0013] 2) A balance column is also provided at the lower end of the lower pressure head. When the pressure block is pressed on the soundboard frame, the balance column stands on the workbench where the soundboard is placed, so that the eccentrically arranged pressure block can be pressed on the soundboard frame more stably, avoiding the pressure block from being deflected under the action of force. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1 Schematic diagram of the pressure block pressed on the soundboard frame and the balance column standing on the workbench. DETAILED DESCRIPTION

[0015] The utility model is further described below in conjunction with the accompanying drawings.

[0016] As attached Figure 1 The adjustable pressure head mechanism of the piano soundboard frame pressing device comprises a lifting and lowering lower pressure rod 1, a lower pressure head 2 is arranged at the lower end of the lower pressure rod 1, a pressing block 3 is arranged at the lower end of the lower pressure head 2, and the pressing block 3 is pressed on the soundboard frame 4 when the lower pressure rod 1 moves downward. The lower pressure head 2 is rotatably matched with the lower pressure rod 1, and the pressing block 3 is eccentrically arranged at the lower end of the lower pressure head 2. When the lower pressure head 2 rotates around the lower pressure rod 1, the pressing position of the pressing block 3 is changed.

[0017] In actual application, the lower pressure rod 1 is the output rod of the cylinder 13. In the piano soundboard frame pressing device, there are a plurality of cylinders 13 arranged in an array, and the position of the cylinder 13 is fixed, so the position of the lower pressure rod 1 is also fixed, so this type of piano soundboard frame pressing device can only be applied to one specification of piano soundboard frame 4. After the lower pressure head 2 in the utility model is installed at the lower end of the lower pressure rod 1, the pressure block 3 is pressed on the soundboard frame 4 instead, and because the pressure block 3 is eccentrically arranged, after the lower pressure head 2 is rotated, the position of the pressure block 3 can be changed, thereby adapting to soundboard frames 4 of different specifications, so as to improve the versatility of the piano soundboard frame pressing device.

[0018] A balance column 5 is provided at the lower end of the lower pressure head 2. The balance column 5 is a vertical column. The pressure block 3 and the balance column 5 are respectively located on both sides of the lower pressure rod 1. In practical applications, the soundboard 7 is placed on a workbench 6, and the soundboard frame 4 is bonded to the top of the soundboard 7 by adhesive. When the pressure block 3 is pressed on the soundboard frame 4, the balance column 5 stands on the workbench 6 where the soundboard 7 is placed, so that the two sides of the lower pressure head 2 are balanced, so that the eccentrically arranged pressure block 3 can be pressed on the soundboard frame 4 more stably, and the pressure block 3 is prevented from being deflected under the action of force. The pressure block 3 and the balance column 5 are symmetrically arranged with the lower pressure rod 1 as the center, so as to improve the balancing effect of the balance column 5 on the lower pressure head 2.

[0019] As attached Figure 1 As shown in , the lower pressure head 2 includes a cross beam 8, a pressure block 3 is fixedly arranged below one end of the cross beam 8, and a balance column 5 is movably arranged at the other end of the cross beam 8, so that the relative height between the balance column 5 and the cross beam 8 is adjustable. The height of the soundboard frame 4 of different specifications may vary, so it is necessary to adjust the relative height between the balance column 5 and the cross beam 8 to ensure that when the pressure block 3 is pressed on the soundboard frame 4, the balance column 5 stands on the workbench 6 accordingly.

[0020] The lower pressure head 2 includes a sleeve 9, the upper end of which is open, and the sleeve 9 is rotatably matched with the lower end of the lower pressure rod 1, and the sleeve 9 is rotatably sleeved on the lower end of the lower pressure rod 1. The sleeve 9 is hingedly matched with the middle part of the crossbeam 8, the central axis of the crossbeam 8 extends horizontally, and the two ends of the crossbeam 8 can shake up and down. A telescopic spring 10 is arranged on the balance column 5, and one end of the crossbeam 8 close to the balance column 5 is pressed on the balance column 5 through the telescopic spring 10. Since the crossbeam 8 is rotatable, and the balance column 5 and the pressure block 3 are correspondingly arranged on both sides of the crossbeam 8, and the crossbeam 8 is pressed on the balance column 5 through the telescopic spring 10, when the crossbeam 8 is in a horizontal state, it means that the forces distributed on the balance column 5 and the pressure block 3 are equivalent, so as to judge whether the two sides of the lower pressure head 2 are in a relatively balanced state.

[0021] As attached Figure 1As shown in , the cross beam 8 is provided with a guide hole, which extends vertically. The balance column 5 is located in the guide hole and slides with the guide hole. The shape of the balance column 5 corresponds to the shape of the guide hole. The balance column 5 has a threaded section, and the threaded section of the balance column 5 is threaded with an adjusting nut 11. The telescopic spring 10 is sleeved on the balance column 5, the upper end of the telescopic spring 10 abuts the cross beam 8, and the lower end of the telescopic spring 10 abuts the adjusting nut 11. When the adjusting nut 11 rotates on the threaded section, the distance between the adjusting nut 11 and the cross beam 8 changes, thereby adjusting the deformation degree of the telescopic spring 10, and allowing the telescopic spring 10 to push up the cross beam 8, so as to push the cross beam 8 to a horizontal state, thereby balancing the two sides of the lower pressure head 2.

[0022] The crossbeam 8 is provided with a pointer 12, and when the pointer 12 is vertical, the crossbeam 8 is in a horizontal state. The crossbeam 8 itself can be slightly deformed. When the two sides of the lower pressure head 2 are unbalanced, that is, when the forces on the pressure block 3 and the balance column 5 are unequal, the crossbeam 8 will be slightly deformed, causing the pointer 12 to be not in a vertical state, so it can be judged by observing the pointer 12 whether the two sides of the lower pressure head 2 are balanced. When unbalanced, by screwing the adjustment nut 11 to change the deformation degree of the telescopic spring 10, the crossbeam 8 can be turned into a balanced state.

[0023] When the adjustable pressure head mechanism of the utility model is working, the lower pressure head 2 is installed at the lower end of the output rod of the cylinder 13 of the piano soundboard frame pressing device, and the lower pressure head 2 is rotated to change the pressing position of the pressure block 3 to adapt to soundboard frames 4 of different specifications, thereby improving the versatility of the piano soundboard frame pressing device, and the forces on the pressure block 3 and the balance column 5 are gradually made equal by screwing the adjustment nut 11, and it is judged whether the forces on the pressure block 3 and the balance column 5 are equal by observing whether the pointing needle 12 is vertical, and then it is judged whether the two sides of the lower pressure head 2 are balanced.

[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An adjustable pressing head mechanism for a piano soundboard frame pressing device, characterized in that: The invention comprises a lower pressure rod (1) which can be raised and lowered, a lower pressure head (2) being arranged at the lower end of the lower pressure rod (1), a pressure block (3) being arranged at the lower end of the lower pressure head (2), and the pressure block (3) being pressed on the sound board frame (4) when the lower pressure rod (1) moves downward; the lower pressure head (2) and the lower pressure rod (1) are rotatably matched, the pressure block (3) is eccentrically arranged at the lower end of the lower pressure head (2), and when the lower pressure head (2) rotates around the lower pressure rod (1), the downward pressing position of the pressure block (3) is changed.

2. The adjustable pressing head mechanism of the piano soundboard frame pressing device according to claim 1, characterized in that: A balance column (5) is provided at the lower end of the lower pressure head (2), and the pressure block (3) and the balance column (5) are respectively located on both sides of the lower pressure rod (1); when the pressure block (3) is pressed on the soundboard frame (4), the balance column (5) is correspondingly erected on the workbench (6) on which the soundboard (7) is placed.

3. The adjustable pressing head mechanism of the piano soundboard frame pressing device according to claim 2, characterized in that: The pressure block (3) and the balance column (5) are symmetrically arranged with the lower pressure rod (1) as the center.

4. The adjustable pressing head mechanism of the piano soundboard frame pressing device according to claim 3, characterized in that: The lower pressure head (2) comprises a cross beam (8), a pressure block (3) is fixedly arranged at one end of the cross beam (8), and a balance column (5) is movably arranged at the other end of the cross beam (8), so that the relative height between the balance column (5) and the cross beam (8) is adjustable.

5. The adjustable pressing head mechanism of the piano soundboard frame pressing device according to claim 4, characterized in that: The pressing head (2) comprises a sleeve (9), which is rotatably sleeved on the lower end of the pressing rod (1), and the sleeve (9) is hingedly matched with the middle part of the crossbeam (8); a telescopic spring (10) is arranged on the balancing column (5), and one end of the crossbeam (8) close to the balancing column (5) is pressed on the balancing column (5) through the telescopic spring (10).

6. The adjustable pressing head mechanism of the piano soundboard frame pressing device according to claim 5, characterized in that: The cross beam (8) is provided with a guide hole, the balance column (5) is located in the guide hole and is slidably matched with the guide hole; the balance column (5) is provided with a threaded section, and the threaded section of the balance column (5) is threadedly matched with an adjusting nut (11); the telescopic spring (10) is sleeved on the balance column (5), the upper end of the telescopic spring (10) abuts against the cross beam (8), and the lower end of the telescopic spring (10) abuts against the adjusting nut (11), and the adjusting nut (11) adjusts the deformation degree of the telescopic spring (10) when rotating on the threaded section.

7. The adjustable pressing head mechanism of the piano soundboard frame pressing device according to claim 6, characterized in that: The crossbeam (8) is provided with a pointing needle (12), and when the pointing needle (12) is vertical, the crossbeam (8) is correspondingly in a horizontal state.

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