Multimedia teaching all-in-one machine

Abstract

The utility model discloses a multimedia teaching all-in-one machine, which belongs to the technical field of multimedia teaching, and comprises a platform table, a placing groove, a screw rod sliding rail, a sliding frame, a rotating frame, a sliding groove A, a supporting frame and a multimedia display screen, the placing groove is embedded in the upper part of the platform table, and the screw rod sliding rail is fixedly arranged below the inner wall of the placing groove; a sliding frame is slidably arranged on the side of the lead screw sliding rail through a sliding block, and a rotating frame is rotatably arranged on the side of the sliding frame through a bearing. A damping telescopic rod B and an outer side spring contraction supporting frame drive a limiting block to slide into the inner side of an opposite limiting groove A, the multimedia display screen is limited, a lead screw sliding rail is controlled to drive a sliding frame and the multimedia display screen to descend and stretch into a containing groove through a sliding block, and after the sliding frame makes contact with the upper portion of the containing groove and is closed, the multimedia display screen is fixed. The folding operation of the multimedia display screen is completed, a worker can conveniently fold and unfold the multimedia display screen, and the situation that the multimedia display screen occupies too much use space on the surface of the platform table can be avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of multimedia teaching, in particular to a multimedia teaching all-in-one machine. Background Art

[0002] Multimedia teaching is a teaching method that uses a variety of media technologies, such as text, pictures, audio, video, etc., to present and interact with teaching content. By making multimedia courseware, the teaching content can be presented in the form of a combination of pictures, texts, audio and video.

[0003] Among them, the application number is CN202220031841.9, a multimedia teaching all-in-one machine. The multimedia teaching all-in-one machine has a screw rod driven by a rotating handle to rotate, and a nut block drives the upper hinge rod to unfold the two screens, so that more content can be displayed during teaching, and it can be folded when not in use, saving space; among them, the shortcomings are as follows:

[0004] When the staff uses this kind of multimedia teaching all-in-one machine and extends it for use, they turn the handle to drive the screw to rotate. Since the nut fits the support plate and moves to play a limiting role, the nut block drives the upper hinge rod to unfold the two screens. This makes it easier to display more content during teaching, and they can be folded when not in use, saving space. When the two screens are unfolded and merged by the hinge rod driven by the nut block, since the multimedia teaching all-in-one machine is still on the surface of the machine and exposed to the outside, the two screens will occupy the usable space, causing some inconvenience to the staff when using this kind of multimedia teaching all-in-one machine. Utility Model Content

[0005] The purpose of the utility model is to provide a multimedia teaching all-in-one machine in order to solve the problem that the above-mentioned multimedia teaching all-in-one machine is slightly inconvenient in use.

[0006] The technical scheme adopted by the utility model is as follows: a multimedia teaching all-in-one machine, including a podium table, a placement groove, a screw slide rail, a sliding frame, a rotating frame, a slide groove A, a support frame and a multimedia display screen, wherein a placement groove is embedded above the podium table, a screw slide rail is fixedly installed below the inner wall of the placement groove, a sliding frame is slidably arranged on the side of the screw slide rail through a slider, a rotating frame is rotatably arranged on the side of the sliding frame through a bearing, a slide groove A is embedded on the side of the rotating frame, a support frame is slidably arranged on the inside of the slide groove A, a multimedia display screen is arranged on the side of the support frame, a rotating and retracting mechanism is arranged on the side of the rotating frame for convenient staff to retract and retract the multimedia display screen, an angle limit adjustment mechanism is arranged on the side of the multimedia display screen for convenient angle adjustment, and a buffer mechanism is arranged inside the placement groove to prevent the multimedia display screen from shaking and being damaged.

[0007] Among them, the rotating retracting and releasing mechanism is composed of a limit groove A, a limit block and a damping telescopic rod B. The damping telescopic rod B is fixedly installed between the side of the support frame and the side of the inner wall of the slide groove A, and a spring is matched with the outside of the damping telescopic rod B. The limit blocks are fixedly installed around the side of the support frame, and the side of the sliding frame is embedded with a limit groove A near the side of the support frame. There are several limit grooves A, which are equidistantly arranged around, and the limit blocks are slidingly arranged on the inner side of the limit groove A.

[0008] Among them, the angle limit adjustment mechanism is composed of an adjusting slide, a slide B, a limit frame, a telescopic rod, an adjusting bracket and a limit slot B. An adjusting slide is embedded between the upper and lower parts of the support frame, and the adjusting slide is arranged in an arc shape. An adjusting bracket is fixedly installed on the side of the multimedia display screen, and the adjusting bracket is arranged in an arc shape, and the adjusting bracket is slidingly arranged on the inner side of the adjusting slide, and the adjusting slide is arranged in an arc shape. On the inner side of the multimedia display screen, a slide B is embedded on the side of the support frame close to the inner wall of the adjusting slide. A limit slot B is embedded on the side of the adjusting bracket, and a limit frame is slidingly arranged between the limit slot B and the inner side of the slide B. A telescopic rod is fixedly installed between the upper and lower parts of the side of the limit frame and the side of the inner wall of the slide B, and a spring is matched on the outside of the telescopic rod.

[0009] Among them, the buffer mechanism is composed of a damping telescopic rod A, a buffer plate and a limiting pressure groove. The damping telescopic rods A are relatively fixedly installed on both sides above the sliding frame and on both sides below the inner wall of the placement groove, and a spring is matched with the outside of the damping telescopic rod A. A buffer plate is relatively fixedly installed between the ends of the two parallel damping telescopic rods A, and the buffer plate is made of butadiene rubber. The limiting pressure grooves are embedded in the opposite surfaces of the two buffer plates, and the limiting pressure grooves are squeezed and slidably arranged at the upper and lower sides of the outer side of the multimedia display screen.

[0010] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0011] 1. This kind of multimedia teaching all-in-one machine is provided with a rotating retractable mechanism, which enables the staff to cooperate between the limit slot A, the limit block and the damping telescopic rod B, and use the limit block to slide freely inside the limit slot A through the damping telescopic rod B. This makes it convenient for the staff to retract and extend the multimedia display screen, and can avoid the multimedia display screen occupying too much use space on the surface of the podium table.

[0012] 2. This multimedia teaching all-in-one machine is equipped with an angle limit adjustment mechanism, which allows the staff to adjust the slide, slide B, limit frame, telescopic rod, adjustment bracket and limit slot B, and use the adjustment bracket to slide freely inside the adjustment slide. The limit frame slides freely inside the limit slot B through the telescopic rod to limit the position, so that the staff can freely adjust the angle of the multimedia display screen to adapt to the viewing effect of students in different positions.

[0013] 3. This multimedia teaching all-in-one machine is provided with a buffer mechanism, so that the staff can use the damping telescopic rod A, the buffer plate and the limit pressure groove to cooperate with each other, and use the damping telescopic rod A and the outer spring to buffer and reduce the shock of the multimedia display screen limited between the inner sides of the limit pressure groove on the opposite sides of the buffer plate, thereby improving the effect of more stabilizing the multimedia display screen and reducing vibration, and avoiding damage to internal accessories of the multimedia display screen due to vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the three-dimensional structure of the multimedia teaching all-in-one machine of the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the multimedia teaching all-in-one machine in the utility model in a front view and a cross-section view in a retracted state;

[0016] Figure 3 This is a schematic diagram of the structure of the multimedia teaching all-in-one machine in the utility model in front view and section view in use state;

[0017] Figure 4 For the utility model Figure 2 The enlarged schematic diagram of the structure at A in the middle;

[0018] Figure 5 For the utility model Figure 3 The enlarged structural diagram at point B in the middle.

[0019] Markings in the figure: 1. Podium table; 101. Placement slot; 102. Screw slide rail; 103. Sliding frame; 104. Damping telescopic rod A; 105. Buffer plate; 106. Limiting pressure groove; 107. Limiting groove A; 2. Rotating frame; 201. Slide A; 202. Support frame; 203. Limiting block; 204. Damping telescopic rod B; 205. Adjusting slide; 206. Slide B; 207. Limiting frame; 208. Telescopic rod; 3. Multimedia display screen; 301. Adjusting bracket; 302. Limiting groove B. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the utility model:

[0022] Example 1: Reference Figure 1-4 A multimedia teaching all-in-one machine comprises a podium table 1, a placement slot 101, a screw guide rail 102, a sliding frame 103, a rotating frame 2, a slide groove A201, a support frame 202 and a multimedia display screen 3. The podium table 1 is embedded with a placement slot 101, a screw guide rail 102 is fixedly installed below the inner wall of the placement slot 101, a sliding frame 103 is slidably arranged on the side of the screw guide rail 102 through a slider, a rotating frame 2 is rotatably arranged on the side of the sliding frame 103 through a bearing, a slide groove A201 is embedded on the side of the rotating frame 2, a support frame 202 is slidably arranged inside the slide groove A201, a multimedia display screen 3 is arranged on the side of the support frame 202, a rotating and retracting mechanism for facilitating the staff to retract and release the multimedia display screen is arranged on the side of the rotating frame 2, an angle limit adjustment mechanism for facilitating the angle adjustment is arranged on the side of the multimedia display screen 3, and a buffer mechanism for preventing the multimedia display screen 3 from shaking and being damaged is arranged inside the placement slot.

[0023] Reference Figure 2 , 3 5. Further, the rotating retractable mechanism is composed of a limit groove A107, a limit block 203 and a damping telescopic rod B204;

[0024] A damping telescopic rod B204 is fixedly installed between the side of the support frame 202 and the side of the inner wall of the slide groove A201, and a spring is matched on the outside of the damping telescopic rod B204. A limit block 203 is fixedly installed around the side of the support frame 202. A limit groove A107 is embedded on the side of the sliding frame 103 close to the side of the support frame 202. There are several limit grooves A107, which are equidistantly arranged around, and the limit block 203 is slidably arranged on the inside of the limit groove A107. When the staff needs to use the multimedia display screen 3 to teach students, the control screw slide rail After the sliding frame 102 drives the sliding frame 103 and the multimedia display screen 3 to extend upward from the placement groove 101 through the slider, the multimedia display screen 3 is pushed to drive the damping telescopic rod B204 and the outer spring of the support frame 202 to expand, so that the limit block 203 slides out of the limit groove A107 and releases the rotating frame 2. The staff pushes the multimedia display screen 3 to drive the rotating frame 2 to rotate through the bearing, so that the display screen 3 placed vertically on the side is straightened through rotation, and then the multimedia display screen 3 is released, so that the damping telescopic rod B204 and the outer spring contract the support frame 202 to drive the limit block 20 3 slides into the inner side of the relative limiting groove A107, limits the multimedia display screen 3, completes the placement of the multimedia display screen 3, and controls the multimedia display screen 3. When the multimedia display screen 3 needs to be retracted after the teaching of the students in the classroom is completed, the staff pushes the multimedia display screen 3 to drive the damping telescopic rod B204 and the outer spring behind the support frame 202 to expand, so that the limiting block 203 slides out of the limiting groove A107 and releases the rotating frame 2. After the two sides of the multimedia display screen 3 are respectively in the downward direction and the upward direction, the multimedia display screen 3 is released to make the damping The telescopic rod B204 and the outer spring contraction support frame 202 drive the limit block 203 to slide into the inner side of the relative limit groove A107, limit the multimedia display screen 3, and control the screw slide rail 102 to drive the sliding frame 103 and the multimedia display screen 3 to descend and extend into the placement groove 101 through the slider, so that the sliding frame 103 contacts the top of the placement groove 101 and closes, completing the folding operation of the multimedia display screen 3, which is convenient for the staff to retract and release the multimedia display screen 3, and can avoid the multimedia display screen 3 occupying too much use space on the surface of the podium table 1.

[0025] Reference Figure 2 , 3 5. Further, the angle limit adjustment mechanism is composed of an adjustment slide 205, a slide B206, a limit frame 207, a telescopic rod 208, an adjustment bracket 301 and a limit slot B302;

[0026] An adjusting slide 205 is embedded between the upper and lower parts of the support frame 202, and the adjusting slide 205 is arranged in an arc shape. An adjusting bracket 301 is fixedly installed on the side of the multimedia display screen 3, and the adjusting bracket 301 is arranged in an arc shape, and the adjusting bracket 301 is slidingly arranged on the inner side of the adjusting slide 205, and the adjusting slide 205 is arranged in an arc shape. On the inner side of the multimedia display screen 3, a slide B206 is embedded on the side of the support frame 202 close to the inner wall of the adjusting slide 205, and a limiting groove B302 is embedded on the side of the adjusting bracket 301, and a limiting frame 207 is slidingly arranged between the limiting groove B302 and the inner side of the slide B206, and a telescopic rod 208 is fixedly installed between the upper and lower sides of the side of the limiting frame 207 and the side of the inner wall of the slide B206, and a spring is arranged on the outer side of the telescopic rod 208. When the staff moves the multimedia display After the multimedia display screen 3 extends out from the placement slot 101 and the multimedia display screen 3 is placed flat and adjusted, the limit frame 207 is pushed to drive the telescopic rod 208 and the outer spring to expand, so that the limit frame 207 slides out of the limit slot B302 and releases the adjustment bracket 301. The staff pushes the multimedia display screen 3 to drive the adjustment bracket 301 to slide inside the adjustment slide slot 205, and drives the multimedia display screen 3 to adjust to a suitable angle. After that, the telescopic rod 208 and the outer spring contract the limit frame 207 to slide into one of the relative limit slots B302 to limit and fix the adjustment bracket 301, the adjustment of the multimedia display screen 3 to a suitable angle is completed, so that students at different positions away from the multimedia display screen 3 can clearly see the multimedia display screen 3, which is convenient for the staff to freely adjust the angle of the multimedia display screen 3 to adapt to the viewing effect of students at different positions.

[0027] Reference Figure 2-4 , further, the buffer mechanism is composed of a damping telescopic rod A104, a buffer plate 105 and a limiting pressure groove 106;

[0028] Damping telescopic rods A104 are relatively fixedly installed on both sides above the sliding frame 103 and on both sides below the inner wall of the placement groove 101, and a spring is matched with the outer side of the damping telescopic rod A104. A buffer plate 105 is relatively fixedly installed between the ends of the two parallel damping telescopic rods A104, and the buffer plate 105 is made of butadiene rubber. The opposite surfaces of the two buffer plates 105 are embedded with limited pressure grooves 106, and the limited pressure grooves 106 are squeezed and slidably arranged at the upper and lower sides of the outer side of the multimedia display screen 3. When the staff controls the screw slide rail 102 to pass through the slider After driving the sliding frame 103 and the multimedia display screen 3 to extend upward from the placement groove 101, loosen and adjust the multimedia display screen 3 to the correct placement direction, push the buffer plate 105 to drive the half-retracted damping telescopic rod A104 and the outer spring to retract the buffer plate 105, slide the multimedia display screen 3 out of the side limit pressing groove 106, and make the retracted damping telescopic rod A104 and the outer spring pop out of the buffer plate 105, and when the staff needs to retract the multimedia display screen 3 after use, loosen and adjust the sides of the multimedia display screen 3 After being in the downward direction and the upward direction respectively, one side of the multimedia display screen 3 will be squeezed and slid into the inner side of the limiting groove 106, and the buffer plate 105 and the outer spring will be squeezed to contract, and the screw slide rail 102 will be controlled to drive the sliding frame 103 and the multimedia display screen 3 to descend and extend into the placement groove 101 through the slider, so that the sliding frame 103 contacts the top of the placement groove 101 and closes, and the other side of the multimedia display screen 3 is squeezed and slid into the inner side of the limiting groove 106, and another buffer plate 105 and the outer spring are squeezed to contract, so that the multimedia display screen 3 is limited between the inner sides of the relative limiting grooves 106. If the staff needs to move the podium table 1, the vibration generated by moving the podium table 1 will be weakened by the damping telescopic rod A104 and the outer spring, and the multimedia display screen 3 between the buffer plate 105 made of butadiene rubber is buffered, and the buffer plate 105 made of butadiene rubber with wear resistance and elasticity can avoid collision with the multimedia display screen 3 to cause damage, thereby improving the effect of more stably reducing vibration of the multimedia display screen 3 and avoiding damage to internal accessories caused by vibration of the multimedia display screen 3.

[0029] Reference Figure 2-5 Furthermore, the multimedia display screen 3 is electrically connected to an external power source through a matching control panel.

[0030] Embodiment 2:

[0031] like Figure 2-4As shown, in addition to the embodiment in which the buffer plate 105 is made of butadiene rubber, the utility model also has another embodiment in which the buffer plate 105 is made of chloroprene rubber. Since chloroprene rubber has the characteristics of high tensile strength, wear resistance and aging resistance, when the staff needs to move the podium table 1, the vibration generated by moving the podium table 1 will be weakened by the damping telescopic rod A104 and the outer spring, thereby buffering the multimedia display screen 3 between the buffer plates 105 made of butadiene rubber. The buffer plate 105 made of chloroprene rubber with high tensile strength, wear resistance and aging resistance can avoid extrusion and tearing damage between the multimedia display screen 3, and has better tearing resistance than the first embodiment.

[0032] Working principle: First, when the staff needs to use the multimedia display screen 3 to teach students, the control screw slide rail 102 drives the sliding frame 103 and the multimedia display screen 3 to extend upward from the placement slot 101 through the slider, and then pushes the buffer plate 105 to drive the half-retracted damping telescopic rod A104 and the outer spring to retract the buffer plate 105, and slide the multimedia display screen 3 out of the side limit pressure groove 106, and make the retracted damping telescopic rod A104 and the outer spring pop out of the buffer plate 105, and then push the multimedia display screen 3 to drive the damping telescopic rod B204 and the outer spring behind the support frame 202 to expand, so that the limit block 203 slides out of the limit groove A107 and releases the rotating frame 2. Then the staff pushes the multimedia display screen 3 to drive the rotating frame 2 to rotate through the bearing , after the display screen 3 placed vertically on the side is rotated and aligned, the multimedia display screen 3 is released, so that the damping telescopic rod B204 and the outer spring contraction support frame 202 drive the limit block 203 to slide into the inner side of the relative limit groove A107, and after the multimedia display screen 3 is limited, the placement of the multimedia display screen 3 is completed, and then, the limit frame 207 is pushed to drive the telescopic rod 208 and the outer spring to expand, so that the limit frame 207 slides out of the limit groove B302. After releasing the adjustment bracket 301, the staff pushes the multimedia display screen 3 to drive the adjustment bracket 301 to slide inside the adjustment slide groove 205, and after driving the multimedia display screen 3 to adjust to a suitable angle, the telescopic rod 208 and the outer spring contraction limit frame 207 slide into one of the relative limit grooves B After the adjustment bracket 301 is limited and fixed on the inner side of 302, the adjustment process of the appropriate angle of the multimedia display screen 3 is completed, so that students at different positions of the multimedia display screen 3 can clearly see the multimedia display screen 3, and the multimedia display screen 3 is controlled to be retracted after the teaching of the students in the classroom. The staff pushes the multimedia display screen 3 to drive the damping telescopic rod B204 and the outer spring behind the support frame 202 to expand, so that the limit block 203 slides out of the limit groove A107 and releases the rotating frame 2. After rotating the two sides of the multimedia display screen 3 in the downward direction and the upward direction respectively, release the multimedia display screen 3, so that the damping telescopic rod B204 and the outer spring contract the support frame 202 to drive the limit block 203 to slide into the relative limit The multimedia display screen 3 is limited to the inner side of the positioning groove A107, and finally, one side of the multimedia display screen 3 is squeezed and slid into the inner side of the limiting pressure groove 106, and the buffer plate 105 and the outer spring are squeezed to contract, and the screw guide rail 102 is controlled to drive the sliding frame 103 and the multimedia display screen 3 to descend and extend into the placement groove 101 through the slider, so that the sliding frame 103 contacts the top of the placement groove 101 and closes, and the other side of the multimedia display screen 3 is squeezed and slid into the inner side of the limiting pressure groove 106, and another buffer plate 105 and the outer spring are squeezed to contract, so that the multimedia display screen 3 is limited between the inner sides of the relative limiting pressure grooves 106. If the staff needs to move the podium table 1, the vibration generated by moving the podium table 1 will be weakened by the damping telescopic rod A104 and the outer spring.The buffer plate 105 made of butadiene rubber is used to buffer the multimedia display screen 3, and the buffer plate 105 made of butadiene rubber with wear resistance and elasticity can avoid collision with the multimedia display screen 3 and cause damage.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multimedia teaching all-in-one machine, comprising a podium table (1), a placement slot (101), a screw guide rail (102), a sliding frame (103), a rotating frame (2), a slide groove A (201), a support frame (202) and a multimedia display screen (3), wherein the podium table (1) is embedded with a placement slot (101) on the top, a screw guide rail (102) is fixedly installed below the inner wall of the placement slot (101), a sliding frame (103) is slidably arranged on the side of the screw guide rail (102) through a slider, a rotating frame (2) is rotatably arranged on the side of the sliding frame (103) through a bearing, a slide groove A (201) is embedded on the side of the rotating frame (2), a support frame (202) is slidably arranged on the inside of the slide groove A (201), and a multimedia display screen (3) is arranged on the side of the support frame (202), characterized in that: The rotating frame (2) is provided with a rotating retracting mechanism on the side thereof for facilitating the staff to retract and unfold the multimedia display screen, the multimedia display screen (3) is provided with an angle limit adjustment mechanism on the side thereof for facilitating the angle adjustment, and the placement groove is provided with a buffer mechanism inside thereof for preventing the multimedia display screen (3) from shaking and being damaged; The rotating retractable mechanism is composed of a limiting groove A (107), a limiting block (203) and a damping telescopic rod B (204); A damping telescopic rod B (204) is fixedly installed between the side of the support frame (202) and the side of the inner wall of the slide groove A (201), and a spring is matched with the outer side of the damping telescopic rod B (204); a limiting block (203) is fixedly installed around the side of the support frame (202); a limiting groove A (107) is embedded in the side of the sliding frame (103) near the side of the support frame (202), and the limiting block (203) is slidably arranged on the inner side of the limiting groove A (107); The angle limit adjustment mechanism is composed of an adjustment slide groove (205), a slide groove B (206), a limit frame (207), a telescopic rod (208), an adjustment bracket (301) and a limit groove B (302); An adjusting slide groove (205) is embedded between the upper and lower parts of the support frame (202); an adjusting bracket (301) is fixedly installed on the side of the multimedia display screen (3), and the adjusting bracket (301) is slidably arranged on the inner side of the adjusting slide groove (205); on the inner side of the multimedia display screen (3), a slide groove B (206) is embedded on the side of the support frame (202) close to the inner wall of the adjusting slide groove (205); a limiting groove B (302) is embedded on the side of the adjusting bracket (301), and a limiting frame (207) is slidably arranged between the limiting groove B (302) and the inner side of the slide groove B (206); a telescopic rod (208) is fixedly installed between the upper and lower parts of the side of the limiting frame (207) and the inner wall of the slide groove B (206), and a spring is matched with the outer side of the telescopic rod (208); The buffer mechanism is composed of a damping telescopic rod A (104), a buffer plate (105) and a limiting pressure groove (106); Damping telescopic rods A (104) are relatively fixedly installed on both sides above the sliding frame (103) and on both sides below the inner wall of the placement groove (101), and springs are matchedly arranged on the outside of the damping telescopic rods A (104). A buffer plate (105) is relatively fixedly installed between the ends of the two parallel damping telescopic rods A (104). The two buffer plates (105) are embedded with limiting pressure grooves (106) on the opposite surfaces, and the limiting pressure grooves (106) are extrusion-slidingly arranged on the upper and lower sides of the outside of the multimedia display screen (3).

2. A multimedia teaching all-in-one machine as claimed in claim 1, characterized in that: There are a plurality of limit grooves A (107), which are arranged equidistantly around each other.

3. The multimedia teaching all-in-one machine as claimed in claim 1, characterized in that: The adjusting slide groove (205) is arranged in an arc shape, and the adjusting bracket (301) is arranged in an arc shape.

4. The multimedia teaching all-in-one machine as claimed in claim 1, characterized in that: The buffer plate (105) is made of butadiene rubber.

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