Detection tool for backboard of stringed instrument

Abstract

The utility model discloses a detection tool for a string instrument backboard, and belongs to the technical field of string instrument backboard detection. Comprising a frame, the frame is in a U shape, a line drawing pen and a reference column are arranged at the positions, close to the two ends, in the frame in a sliding mode respectively, and when the backboard is detected, the distance between the line drawing pen and the reference column can be adjusted firstly according to the model of the backboard, then the frame is held by a hand and pushed towards the center of the backboard, and the line drawing pen and the reference column can be adjusted. When the reference column and the line drawing pen are respectively in contact with the bottom and the top of the back plate, the line drawing pen moves to a position to be detected, then the frame is held by hand to enable the line drawing pen to move around the back plate, when the line drawing pen successfully draws a circle of line, the back plate is proved to be a good product, and when the line drawing pen is stuck or cannot draw a line in the moving process, the back plate is proved to be a non-defective product. The whole detection process is very convenient, and the detection device can be adapted to backboards of different models.

Description

Technical Field

[0001] This utility model relates to the field of stringed instrument backplate testing technology, and in particular to a testing tool for stringed instrument backplates. Background Technology

[0002] Stringed instruments include instruments such as cellos, violas, violins, and guitars. The back of these instruments is usually arched in the center and then gradually thins outwards, with a slight curve and thinner, sloping edges (this shape easily causes vibrations, which helps to amplify the sound of the instrument).

[0003] Currently, after the backplate of a stringed instrument is manufactured, it is necessary to use testing tools to check whether the backplate gradually and evenly thins outward from the center. However, the existing testing tools are inconvenient to operate during the testing process and are difficult to adapt to different models of backplates. Utility Model Content

[0004] The purpose of this invention is to solve the problems of inconvenience in operation and difficulty in adapting to different models of back plates when detecting whether the back plate gradually and evenly thins from the center to the periphery in the existing technology, and to propose a detection tool for the back plate of stringed instruments.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A testing tool for the backplate of a stringed instrument includes a frame in the shape of a U. Inside the frame, a drawing pen and a reference post are slidably disposed near both ends. One end of the frame is provided with a limiting member for limiting the drawing pen, and the other end of the frame is threadedly connected with a fastening screw, one end of which abuts against the reference post.

[0007] Preferably, the reference post is located directly below the drawing pen, and the end of the reference post closest to the drawing pen is hemispherical.

[0008] Preferably, the limiting member is a threaded push rod, which is threadedly connected inside the frame, and one end of the threaded push rod abuts against the drawing pen.

[0009] Preferably, an adjustment knob is fixedly installed at the other end of the threaded push rod, and the adjustment knob is located outside the frame.

[0010] Preferably, the frame has scale lines.

[0011] Compared with the prior art, this utility model provides a testing tool for the back plate of stringed instruments, which has the following beneficial effects:

[0012] 1. When inspecting a back panel, this utility model first adjusts the distance between the drawing pen and the reference post according to the back panel model. Then, holding the frame, push it towards the center of the back panel. When the reference post and the drawing pen contact the bottom and top of the back panel respectively, it means that the drawing pen has moved to the position to be inspected. Then, hold the frame to make the drawing pen move around the back panel. When the drawing pen successfully draws a circle of lines, it proves that the back panel is a good product. When the drawing pen gets stuck or cannot draw lines during the movement, it proves that the back panel has a quality problem. The whole inspection process is very convenient and can be adapted to different models of back panels.

[0013] 2. By setting scale lines, this utility model can accurately detect any position on the back panel. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a front view of the present invention.

[0016] Figure 3 This is a cross-sectional view of the present invention.

[0017] In the picture:

[0018] 1. Frame; 2. Drawing pen; 3. Reference column; 4. Threaded top rod; 5. Adjustment knob;

[0019] 6. Fastening screws; 7. Scale lines. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Reference Figure 1-3 A testing tool for the backplate of a stringed instrument includes a frame 1, which is U-shaped. Inside the frame 1, a drawing pen 2 and a reference post 3 are slidably disposed near both ends. The reference post 3 is located directly below the drawing pen 2, and the end of the reference post 3 near the drawing pen 2 is hemispherical. By making the frame 1 U-shaped, it is easier for the tester to hold. By making the end of the reference post 3 near the drawing pen 2 semi-circular, the frame 1 can move more smoothly during testing. The frame 1 has a first through hole adapted to the drawing pen 2 and a second through hole adapted to the reference post 3.

[0022] One end of the frame 1 is provided with a limiting component for limiting the drawing pen 2. The limiting component is a threaded push rod 4, which is threadedly connected inside the frame 1. One end of the threaded push rod 4 is pressed against the drawing pen 2, and the other end of the threaded push rod 4 is fixedly installed with an adjustment knob 5, which is located outside the frame 1. When the adjustment knob 5 is turned in the forward direction, the threaded push rod 4 can be moved away from the drawing pen 2, thereby releasing the fixation of the drawing pen 2. Then, the drawing pen 2 can be moved up and down along the first through hole, thereby adjusting the distance between the drawing pen 2 and the reference post 3. After the drawing pen 2 has moved to the specified height, the adjustment knob 5 is turned in the reverse direction, which can move the threaded push rod 4 towards the drawing pen 2 and press against the drawing pen 2, thereby fixing the drawing pen 2.

[0023] The other end of the frame 1 is threaded with a fastening screw 6, and one end of the fastening screw 6 is pressed against the reference post 3. Loosening the fastening screw 6 can release the fixation of the reference post 3, and tightening the fastening screw 6 can fix the reference post 3.

[0024] When inspecting the back panel, first, adjust the distance between the drawing pen 2 and the reference post 3 according to the model of the back panel. Then, hold the frame 1 and push it towards the center of the back panel. When the reference post 3 and the drawing pen 2 contact the bottom and top of the back panel respectively, it means that the drawing pen 2 has moved to the position to be inspected. Then, hold the frame 1 to make the drawing pen 2 move around the back panel. When the drawing pen 2 successfully draws a circle of lines, it proves that the back panel is good. When the drawing pen 2 gets stuck or cannot draw lines during the movement, it proves that the back panel has a quality problem. The whole inspection process is very convenient and can be adapted to different models of back panels.

[0025] The frame 1 has a scale line 7. By setting the scale line 7, it is possible to accurately detect any position of the back panel.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A detection tool for a back plate of a stringed instrument comprising a frame (1), characterized in that: The shape of the frame (1) is U-shaped, a line drawing pen (2) and a reference column (3) are respectively slidably arranged inside the frame (1) near both ends, one end of the frame (1) is provided with a limiting piece for limiting the line drawing pen (2), the other end of the frame (1) is threadedly connected with a fastening screw (6), and one end of the fastening screw (6) abuts against the reference column (3).

2. A detection tool for a backboard of a stringed instrument according to claim 1, wherein, The reference column (3) is located directly below the line drawing pen (2), and one end of the reference column (3) near the line drawing pen (2) is hemispherical.

3. A detection tool for a backboard of a stringed instrument according to claim 1, wherein, The limiting piece is a threaded ejector pin (4), the threaded ejector pin (4) is threadedly connected inside the frame (1), and one end of the threaded ejector pin (4) abuts against the line drawing pen (2).

4. A detection tool for a backboard of a stringed instrument according to claim 3, wherein, The other end of the threaded ejector pin (4) is fixedly installed with an adjusting knob (5), and the adjusting knob (5) is located outside the frame (1).

5. A detection tool for a backboard of a stringed instrument according to claim 1, wherein, Scale lines (7) are formed on the frame (1).

Images