CN104070894A - Magnetic writing board with handwriting erasing mechanism - Google Patents

Abstract

The invention discloses a magnetic writing board with a handwriting erasing mechanism and belongs to the technical field of teaching aids. The magnetic writing board with the handwriting erasing mechanism comprises a box body, a magnetic display panel is fixed onto the front surface of the box body, the handwriting erasing mechanism is arranged inside the box body and comprises a guide rail fixed inside the box body, the guide rail is arranged in the length direction of the magnetic display panel, a sliding block is arranged on the guide rail, the front of the sliding block is fixedly provided with a magnetic bar support, magnetic bars are fixed onto the magnetic support and are close to the back of the magnetic display panel, the length of the magnetic bar is almost identical with the width of the magnetic display board, the sliding block is connected with a linear motion transmission mechanism driven by a driving device. The magnetic writing board with the handwriting erasing mechanism is dust-pollution-free, environmentally-friendly and healthy due to utilization of the magnetic bars and a magnetic eraser; can achieve fast-erasing of the whole screen through comprehensive application of the electromechanical integration technology, saves physical strength through remote control and manual point control modes, and can be utilized and popularized in areas lack of electric power due to the fact that a manual mode needs no power supply.

Description

Magnetic writing pad with handwriting erasing mechanism

technical field

The invention relates to a magnetic writing board for demonstration, which belongs to the technical field of teaching appliances.

Background technique

At present, the writing boards used for demonstration and teaching are mainly blackboards, which can be roughly divided into three categories in terms of production materials and usage principles:

One is an ordinary blackboard. In terms of production materials, green board is currently the most widely used. It is composed of surface panels, sandwich materials, and back panels, and is coated with a layer on the surface, which is black and green, hence the name. Secondly, glass blackboards are used more. This kind of blackboards is made of glass plates of 5mm and above. The surface is finely processed, and the back is painted with black paint. There are relevant production standards. In addition, in some underdeveloped areas, there are wooden blackboards and cement blackboards. No matter how the making material of common blackboard changes, all follow the mode of writing with chalk and erasing with blackboard eraser on the principle of use. The biggest disadvantage of this method of use is that the dust is not good for the health of teachers and students.

The second is a dust-free blackboard. In order to meet the requirements of professional writing and safety and environmental protection, special writing panel materials have gradually been produced, which are easy to write and wipe without dust pollution. Common market products include ordinary whiteboards, professional writing grade whiteboards, velvet bulletin boards, and form markings. Board and environmental protection writing film, etc. In terms of the principle of use, this type of dust-free blackboard mainly uses various oil-based pens to replace traditional chalk. Although this kind of oil-based water pen is more environmentally friendly than chalk, it also has the disadvantages of dry water pen handwriting and is difficult to erase.

The third is the electronic whiteboard. The electronic whiteboard is a high-tech product developed by combining cutting-edge electronic technology, software technology and other high-tech means. It can be used in combination with computers and projectors to realize paperless office and teaching. In addition to meeting the most basic writing needs, the latest electronic whiteboard also has interactive functions, which can provide efficient and rich image services in a full-bodied manner. According to the principle of use, electronic whiteboards can be divided into pressure sensitive, ultrasonic, electromagnetic, infrared, laser electronic whiteboards and so on. This kind of "blackboard" has advanced technology, can attract students' attention, and has good teaching effect. It is the development direction of blackboards in the future. Electronic whiteboards are still difficult to popularize in ordinary classrooms.

Contents of the invention

In order to overcome the disadvantages of the above-mentioned prior art, the present invention provides a magnetic writing board with a handwriting erasing mechanism, which uses neither chalk nor oil-based pen, can purify the classroom environment, and can reduce the cost of use.

The present invention is achieved through the following technical solutions: a magnetic writing board with a handwriting erasing mechanism, which includes a box body, a magnetic display board is fixed on the front surface of the box body, and the magnetic display board is clamped on the magnetic board, the pressure plate and the magnetic board. Between the lining boards under the board, a handwriting erasing mechanism is installed in the box. The handwriting erasing mechanism includes a guide rail fixed in the box. The guide rail is arranged along the length direction of the magnetic display panel. A slider is installed on the guide rail. A magnetic strip bracket is fixed on the front of the block, and a magnetic strip is fixed on the magnetic strip bracket. The magnetic strip is close to the back of the magnetic display panel. The length of the magnetic strip is equivalent to the width of the magnetic display panel. The slider is connected with a linear motion transmission Mechanism, the linear motion transmission mechanism is driven by the driving device.

The linear motion transmission mechanism includes synchronous pulleys installed at both ends of the guide rail, and a synchronous belt is engaged with the synchronous belt wheel, and the synchronous belt bypasses the synchronous pulley to form a front layer and a rear layer. The pulley is fixed on the slider, and the middle part of the slider is made with a belt hole, and the timing pulley of the rear layer passes through the belt hole. The timing pulley at either end of the guide rail is equipped with a drive shaft, and the drive shaft is connected to the drive shaft. device connection.

The drive device is a motor, the motor is fixed on the box body through a motor bracket, the output shaft of the motor is connected with the drive shaft through a coupling, the box is equipped with a control circuit for controlling the movement of the motor, and the guide rail Limit switches are installed at both ends.

The linear motion transmission mechanism includes bearing brackets IV installed at both ends of the guide rail, a lead screw is installed between the bearing brackets IV, a threaded hole is made in the middle of the slider, and the lead screw passes through the threaded hole Pass through to form a screw transmission pair, and one end of the lead screw protrudes to connect with the driving device.

The drive device is a motor, the motor is fixed on the box and is on the same axis as the screw, the output shaft of the motor is connected to one end of the screw through a coupling, and the control circuit for controlling the movement of the motor is installed in the box , Limit switches are installed at both ends of the guide rail.

The control circuit includes a single-chip microcomputer, and a motor drive module connected to the single-chip microcomputer for driving the motor movement, a jog button for starting and stopping the motor, a remote control signal receiving module for starting and stopping the motor, and also includes a signal to the The single-chip microcomputer, the motor drive module and the power supply module powered by the remote control signal receiving module, and the two limit switches are respectively connected with the single-chip microcomputer.

The driving device is a manual driving device, and the manual driving device includes a manual shaft, which is rotatably fixed on the side wall of the box body, and one end of the manual shaft is connected to the power input end of the linear motion transmission mechanism. The other end of the rotating shaft passes through a hand wheel from the casing.

The drive device also includes a manual drive device, the manual drive device includes a manual shaft, the manual shaft is rotatably fixed on the side wall of the box, and one end of the manual shaft is connected to the lower end of the drive shaft through a bevel gear Secondary meshing connection, the other end of the manual shaft passes through the box and is equipped with a hand wheel, and a clutch device is installed between the hand wheel and the manual shaft. The clutch device includes the spline keypad Ⅰ and spline keypad Ⅱ that mesh with each other, and the spline keypad Ⅰ is fixed on the On the manual shaft, the spline keyboard II is fixed on the hand wheel, the protruding end of the manual shaft is fixed with a guide shaft, and the end of the guide shaft is fixed with a block assembly, and the rigid integral body consisting of the hand wheel and spline keyboard II is slidingly installed on the guide shaft. On the top, a spring is installed between the flower keyboard Ⅰ and the flower keyboard Ⅱ.

The drive device also includes a manual drive device, the manual drive device includes a manual shaft, the manual shaft is rotatably fixed on the side wall of the box, and one end of the manual shaft is connected to the other end of the lead screw. The other end of the manual shaft passes through the box and is equipped with a hand wheel. A clutch device is installed between the hand wheel and the manual shaft. The clutch device includes the intermeshing spline keypad Ⅰ and spline keypad Ⅱ. The spline keypad Ⅰ is fixed on the On the manual shaft, the spline keyboard II is fixed on the handwheel, the protruding end of the manual shaft is fixed with a guide shaft, and the end of the guide shaft is fixed with a block assembly, and the rigid integral sliding sleeve composed of the handwheel and spline keyboard II is mounted on the guide shaft. On the top, a spring is installed between the flower keyboard Ⅰ and the flower keyboard Ⅱ.

The magnetic strip bracket is made as an integral profile with a flat bottom and magnetic strip installation slots on both sides of the upper part. There are two magnetic strips, and the two magnetic strips are respectively embedded in the magnetic strip installation slots on both sides.

The beneficial effects of the present invention are:

1. The present invention is a magnetic writing board, using a magnetic pen for writing, and a magnetic strip and a magnetic eraser for erasing, without dust pollution, environmentally friendly and healthy;

2. A magnetic drawing board with higher resolution can be used;

3. Comprehensive use of electromechanical integration technology can realize rapid erasing of the entire screen, remote control and manual point control save energy, manual mode does not require power supply, and can be popularized and used in areas where power is scarce;

4. With one investment, there is no need to purchase chalk and oil-based pens in the future, saving money.

Description of drawings

The present invention will be further described below according to the accompanying drawings and embodiments.

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the B-B sectional view of Fig. 1;

Fig. 3 is the A-A sectional view of Fig. 1;

Fig. 4 is the C-C sectional view of Fig. 1;

Fig. 5 is a partial enlarged view at D of Fig. 1;

Fig. 6 is a schematic diagram of the control circuit of the present invention;

Fig. 7 is a schematic structural diagram of another embodiment of the present invention;

FIG. 8 is a cross-sectional view along line E-E of FIG. 7 .

In the figure, 1. limit switch, 2. synchronous belt, 3. synchronous pulley, 4. pulley shaft, 5. bearing bracket Ⅰ, 6. guide rail, 7. screw, 8. slider, 8-1. roller, 8-2, belt hole, 8-3, threaded hole, 9, magnetic strip bracket, 9-1, magnetic strip installation groove, 10, magnetic strip, 11, coupling, 12, motor bracket, 13, motor, 14, control circuit, 15, driving shaft, 15-1, bevel gear I, 16, bearing bracket II, 17, manual drive device, 17-1, manual rotating shaft, 17-2, column pin I, 17-3, flower Keyboard Ⅰ, 17-4, spring, 17-5, flower keyboard Ⅱ, 17-6, column pin Ⅱ, 17-7, block assembly, 17-8, handwheel, 17-9, guide shaft, 17-10 , Bevel gear Ⅱ, 18, box body, 18-1, through hole, 19, pressure plate on the magnetic plate, 20, magnetic display plate, 21, jog button, 22, lining plate under the magnetic plate, 23, bearing bracket Ⅲ, 24, bearing bracket IV, 25, leading screw.

Detailed ways

Below in conjunction with embodiment the present invention is further described.

A kind of magnetic writing board with handwriting erasing mechanism shown in Figure 1, Figure 2, Figure 3, Figure 4, Figure 7, it comprises box body 18, and the front surface of box body 18 is fixed with magnetic display board 20 , the magnetic display panel 20 is sandwiched between the pressing plate 19 on the magnetic plate and the lower lining plate 22 of the magnetic plate, and a handwriting erasing mechanism is installed in the box body 18, and the handwriting erasing mechanism includes guide rails fixed in the box body 18 6. The guide rail 6 is arranged along the length direction of the magnetic display board 20. A slider 8 is slidably installed on the guide rail 6. The upper and lower sides of the rear part of the slider 8 are equipped with rollers 8-1. The upper and lower sides of the guide rail 6 are made with raised Wheel rails, the rollers 8-1 are slidingly connected with the upper and lower sides of the guide rail 6, and there can be four or more rollers 8-1, which are distributed on the upper and lower sides of the rear of the slider 8 to support and reduce sliding The role of resistance. The front of slide block 8 is fixed with magnetic stripe support 9, and magnetic stripe support 9 is fixed with magnetic stripe 10, and described magnetic stripe 10 has two, and two magnetic stripes 10 are respectively fixed on the front both sides of magnetic stripe support 9, Two magnetic strips can enhance the erasing effect. The magnetic strip 10 is close to the back of the magnetic display panel 20. The length of the magnetic strip 10 is equivalent to the width of the magnetic display panel 20. The slide block 8 is connected with a linear motion transmission mechanism, and the linear movement The motion transmission mechanism is driven by a driving device.

The first embodiment: as shown in Figure 1 and Figure 2, the linear motion transmission mechanism includes a synchronous pulley 3 installed at both ends of the guide rail 6, and the axles of the synchronous pulley 3 at both ends pass through the bearing bracket I5 respectively. Installed in the box with the bearing bracket II16, the synchronous belt 2 is installed on the synchronous pulley 3, the synchronous belt 2 bypasses the synchronous pulley 3 to form the front layer and the rear layer, and the synchronous pulley 3 of the front layer is fixed by the screw 7 On the slide block 8, the middle part of the slide block 8 is made with a belt passing hole 8-2, the timing belt pulley 3 of the back layer passes through the belt passing hole 8-2, and the timing belt pulley 3 at any end of the guide rail 6 is mounted There is a drive shaft 15, which is connected to the drive means.

Further, the drive device is a motor 13, the motor 13 is fixed on the casing 18 by the motor bracket 12, the output shaft of the motor 13 is connected with the drive shaft 15 through the shaft coupling 11, and the control motor is housed in the casing 18. The control circuit 14 of 13 action, the limit switch 1 is installed at the two ends of the guide rail 6.

After starting the motor, the synchronous belt pulley 3 rotates to drive the synchronous belt 2 to move, and the synchronous belt 2 on the upper layer drives the slider 8 to move linearly from side to side, thereby realizing the left and right erasing function of the magnetic strip 10 . When the magnetic strip 10 moves to the position of the limit switch 1 at both ends of the guide rail 6, the limit switch 1 sends a signal to the single-chip microcomputer to control the start-stop or forward and reverse rotation of the motor.

The second embodiment: as shown in Figure 7 and Figure 8, the linear motion transmission mechanism includes bearing brackets IV 24 installed at both ends of the guide rail 6, and a lead screw 25 is installed between the bearing brackets IV 24, the described The middle part of slide block 8 is made with threaded hole 8-3, and leading screw 25 passes through described threaded hole 8-3 to form screw transmission pair, and one end of leading screw 25 stretches out and is connected with driving device.

Further, the drive device is a motor 13, the motor 13 is fixed on the casing 18 on the same axis as the lead screw 25, the output shaft of the motor 13 is connected with one end of the lead screw 25 through a coupling 11, and the casing The control circuit 14 for controlling the action of the motor 13 is housed in the body 18 , and limit switches 1 are installed at both ends of the guide rail 6 .

After the motor is started, the lead screw 25 rotates, and the slide block 8 is driven to move left and right by the screw feed, thereby realizing the left and right erasing function of the magnetic strip 10 . When the magnetic strip 10 moves to the position of the limit switch 1 at both ends of the guide rail 6, the limit switch 1 sends a signal to the single-chip microcomputer to control the start-stop or forward and reverse rotation of the motor.

As shown in Figure 6, the control circuit 14 in the above-mentioned several embodiments includes a single-chip microcomputer, and a motor drive module for driving the motor motion, a jog button 21 for starting and stopping the motor, and a power button 21 for starting and stopping the power are respectively connected with the single-chip microcomputer. The remote control signal receiving module of the machine also includes a power supply module that supplies power to the single-chip microcomputer, the motor drive module and the remote control signal receiving module, and the two limit switches 1 are respectively connected with the single-chip microcomputer.

The driving device in the above-mentioned several embodiments can also adopt the manual driving device 17 alone, as shown in Figure 5, on the side wall of the box body 18, a through hole 18-1 is made, and the manual driving device 17 includes a manual rotating shaft 17-1, one end of the manual rotating shaft 17-1 is connected to the power input end of the linear motion transmission mechanism, and the other end of the manual rotating shaft 17-1 passes through the through hole 18-1 and a hand wheel 17-8 is installed. The manual rotating shaft 17-1 can be borne on the bearing bracket III 23 in the casing by the shaft, and the bearing can also be installed in the through hole 18-1. Turning the hand wheel can drive the transmission mechanism to move, realize the left and right erasing function of the magnetic strip 10, and can stop at any time.

In the above-mentioned first embodiment, the driving device may also include a manual driving device 17, the manual driving device 17 includes a manual rotating shaft 17-1, and the manual rotating shaft 17-1 is rotatably fixed on the bottom of the box body 18. On the side wall, one end of the manual rotating shaft 17-1 is meshed with the lower end of the drive shaft 15 through a bevel gear pair, that is, the bevel gear II 17-10 installed on the manual rotating shaft 17-1 and the bevel gear II 17-10 installed on the lower end of the drive shaft 15 Bevel gear I 15-1, the other end of the manual shaft 17-1 passes through the box body 18 and a hand wheel 17-8 is installed, and a clutch device is installed between the hand wheel 17-8 and the manual shaft 17-1. The clutch device is for Use with the motor. The clutch device includes spline keypad I17-1 and spline keypad II17-5 which are engaged with each other, spline keypad I17-1 is fixed on the manual shaft 17-1 through pin I17-2, spline keypad II17-5 is fixed through pin II17-6 On the handwheel 17-8, the extended end of the manual rotating shaft 17-1 is fixed with a guide shaft 17-9, and the end of the guide shaft 17-9 is fixed with a catch assembly 17-7, a handwheel 17-8 and a spline keyboard The rigid integral slide of II 17-5 is installed on the guide shaft 17-9, and a spring 17-4 is installed between the flower keyboard I17-1 and the flower keyboard II 17-5. When the erasing device is not in use, or when the motor is operating, the space between the keypad Ⅰ 17-1 and the keypad Ⅱ 17-5 is pushed open by the spring and is in a normally open state. The handwheel is separated from the manual shaft 17-1, and the motor rotates while the handwheel If it does not turn, the handwheel will not be affected. When it is necessary to use the manual mode, press the handwheel to make the keypad Ⅰ 17-1 mesh with the keypad Ⅱ 17-5, the handwheel is combined with the manual shaft 17-1, and turning the handwheel can drive the drive shaft 15 of the transmission to rotate, realizing The left and right erasing function of the magnetic stripe 10 can be stopped at any time.

In the above-mentioned second embodiment, the driving device may also include a manual driving device 17, the manual driving device 17 includes a manual rotating shaft 17-1, and the manual rotating shaft 17-1 is rotatably fixed on the bottom of the box body 18. On the side wall, one end of the manual rotating shaft 17-1 is connected with the other end of the described leading screw 25 through a coupling. With reference to the position in Fig. The other end of -1 passes through the box body 18 and is equipped with a hand wheel 17-8. A clutch device is installed between the hand wheel 17-8 and the manual shaft 17-1. The keyboard Ⅱ17-5, the flower keyboard Ⅰ17-1 are fixed on the manual shaft 17-1 through the column pin Ⅰ17-2, the flower keyboard Ⅱ17-5 is fixed on the handwheel 17-8 through the column pin Ⅱ17-6, and the manual shaft 17-1 The protruding end of the guide shaft 17-9 is fixed with a guide shaft 17-9, the end of the guide shaft 17-9 is fixed with a block assembly 17-7, and the rigid integral sliding sleeve composed of the hand wheel 17-8 and the figure keyboard II 17-5 is mounted on the guide shaft 17 On -9, spring 17-4 is installed between flower keyboard I 17-1 and flower keyboard II 17-5. When the erasing device is not in use, or when the motor is operating, the space between the keypad Ⅰ 17-1 and the keypad Ⅱ 17-5 is pushed open by the spring and is in a normally open state. The handwheel is separated from the manual shaft 17-1, and the motor rotates while the handwheel If it does not turn, the handwheel will not be affected. When the manual mode needs to be used, press the handwheel to make the keypad Ⅰ 17-1 mesh with the keypad Ⅱ 17-5, the handwheel is combined with the manual shaft 17-1, and turning the handwheel can drive the screw 25 to rotate, realizing the magnetic strip 10 The left and right erasing function can be stopped at any time.

As shown in Fig. 3, described magnetic strip support 9 is made into the integral profile that the bottom is plane, with magnetic strip installation groove 9-1 on both sides of the upper part, described magnetic strip 10 has two, two magnetic strips 10 respectively embedded in the magnetic strip installation grooves 9-1 on both sides. This method is easy to install and light in structure.

Erase the content of the blackboard on the whole screen by remote control: Use the remote control to send control commands to the remote control signal receiving module in the control circuit. Limiting effect. the

Erase the content of the blackboard on the whole screen by manual jogging: Press the button by hand, the single-chip microcomputer detects that the button is pressed, and controls the motor drive module according to the time when the button is pressed to make the erasing device behind the screen work, erase the blackboard, limit The switch acts as a limit.

Manually erase the blackboard content on the whole screen: press and hold the handwheel with your hand, overcome the spring force, make the spline clutch device engage, rotate the handwheel, the motion is transmitted from the bevel gear transmission pair to the synchronous belt wheel or the shaft where the screw is located, and drives the screen After the erase device works, erase the blackboard.

Claims (10)

1. the magnetic writing board of a Zhong Dai handwriting erasing mechanism, it is characterized in that: it comprises casing (18), the front surface of casing (18) is fixed with magnetic display board (20), magnetic display board (20) is installed under magnetic sheet top board (19) and magnetic sheet between liner plate (22), in described casing (18), handwriting erasing mechanism is installed, handwriting erasing mechanism comprises the guide rail (6) being fixed in casing (18), guide rail (6) is along the length direction setting of magnetic display board (20), on guide rail (6), be slidably fitted with slide block (8), before slide block (8), be fixed with magnetic stripe support (9), on magnetic stripe support (9), be fixed with magnetic stripe (10), after the close magnetic display board (20) of magnetic stripe (10), the width of the length of magnetic stripe (10) and magnetic display board (20) is suitable, on described slide block (8), be connected with rectilinear motion transmission mechanism, rectilinear motion transmission mechanism is driven by drive unit.

2. the magnetic writing board with handwriting erasing mechanism according to claim 1, it is characterized in that: described rectilinear motion transmission mechanism comprises the synchronous pulley (3) that is arranged on described guide rail (6) two ends, the upper engagement of synchronous pulley (3) is provided with Timing Belt (2), Timing Belt (2) is walked around and is formed anterior layer and rear layer from synchronous pulley (3), the synchronous pulley (3) of anterior layer is fixed on described slide block (8), the middle part of slide block (8) was manufactured with (8-2) with holes, the synchronous pulley (3) of rear layer passes from (8-2) excessively with holes, on the synchronous pulley (3) of the arbitrary end of guide rail (6), driving shaft (15) is housed, driving shaft (15) is connected with drive unit.

3. the magnetic writing board with handwriting erasing mechanism according to claim 2, it is characterized in that: described drive unit is motor (13), motor (13) is fixed on casing (18) by electric machine support (12), the output shaft of motor (13) is connected with described driving shaft (15) by shaft coupling (11), the control circuit (14) of controlling motor (13) action is housed in casing (18), and the end positions of described guide rail (6) is provided with limit switch (1).

4. the magnetic writing board with handwriting erasing mechanism according to claim 1, it is characterized in that: described rectilinear motion transmission mechanism comprises the support of bearing IV (24) that is arranged on described guide rail (6) two ends, leading screw (25) is installed between support of bearing IV (24), the middle part of described slide block (8) is manufactured with screwed hole (8-3), leading screw (25) is from described screwed hole (8-3) through forming worm drive pair, and one end of leading screw (25) is stretched out with drive unit and is connected.

5. the magnetic writing board with handwriting erasing mechanism according to claim 4, it is characterized in that: described drive unit is motor (13), motor (13) is fixed on the upper and described leading screw (25) of casing (18) on same axis, the output shaft of motor (13) is connected with one end of leading screw (25) by shaft coupling (11), the control circuit (14) of controlling motor (13) action is housed in casing (18), and the end positions of described guide rail (6) is provided with limit switch (1).

6. according to the magnetic writing board with handwriting erasing mechanism described in claim 3 or 5, it is characterized in that: described control circuit (14) comprises single-chip microcomputer, and be connected with single-chip microcomputer respectively for the motor drive module of drive motors motion, for the inching button (21) of start and stop motor, for the remote control signal receiving module of start and stop motor, also comprise that described two limit switches (1) are connected with single-chip microcomputer respectively to the power module of described single-chip microcomputer, motor drive module and remote control signal receiving module power supply.

7. according to the magnetic writing board with handwriting erasing mechanism described in claim 1 or 2 or 4, it is characterized in that: described drive unit is manual driving device (17), manual driving device (17) comprises hand-operated rotating shaft (17-1), on the rotating sidewall that is fixed on described casing (18) of hand-operated rotating shaft (17-1), one end of hand-operated rotating shaft (17-1) is connected with the power intake of rectilinear motion transmission mechanism, and the other end of hand-operated rotating shaft (17-1) passes handwheel (17-8) is installed from casing (18).

8. the magnetic writing board with handwriting erasing mechanism according to claim 3, it is characterized in that: described drive unit also comprises manual driving device (17), manual driving device (17) comprises hand-operated rotating shaft (17-1), on the rotating sidewall that is fixed on described casing (18) of hand-operated rotating shaft (17-1), the lower end of one end of hand-operated rotating shaft (17-1) and described driving shaft (15) is connected with a joggle by bevel gear pair, the other end of hand-operated rotating shaft (17-1) passes handwheel (17-8) is installed from casing (18), between handwheel (17-8) and hand-operated rotating shaft (17-1), arrangement of clutch is housed, arrangement of clutch comprises intermeshing flower keyboard I (17-1) and flower keyboard II (17-5), flower keyboard I (17-1) is fixed on hand-operated rotating shaft (17-1), flower keyboard II (17-5) is fixed on handwheel (17-8), the external part of hand-operated rotating shaft (17-1) is fixed with the axis of guide (17-9), the end of the axis of guide (17-9) is fixed with catch assembly (17-7), the rigid integral sliding of handwheel (17-8) and flower keyboard II (17-5) composition is arranged on the axis of guide (17-9), between flower keyboard I (17-1) and flower keyboard II (17-5), spring (17-4) is installed.

9. the magnetic writing board with handwriting erasing mechanism according to claim 5, it is characterized in that: described drive unit also comprises manual driving device (17), manual driving device (17) comprises hand-operated rotating shaft (17-1), on the rotating sidewall that is fixed on described casing (18) of hand-operated rotating shaft (17-1), one end of hand-operated rotating shaft (17-1) is connected by shaft coupling with the other end of described leading screw (25), the other end of hand-operated rotating shaft (17-1) passes handwheel (17-8) is installed from casing (18), between handwheel (17-8) and hand-operated rotating shaft (17-1), arrangement of clutch is housed, arrangement of clutch comprises intermeshing flower keyboard I (17-1) and flower keyboard II (17-5), flower keyboard I (17-1) is fixed on hand-operated rotating shaft (17-1), flower keyboard II (17-5) is fixed on handwheel (17-8), the external part of hand-operated rotating shaft (17-1) is fixed with the axis of guide (17-9), the end of the axis of guide (17-9) is fixed with catch assembly (17-7), the rigid integral sliding of handwheel (17-8) and flower keyboard II (17-5) composition is sleeved on the axis of guide (17-9), between flower keyboard I (17-1) and flower keyboard II (17-5), spring (17-4) is installed.

10. the magnetic writing board with handwriting erasing mechanism according to claim 1, it is characterized in that: described magnetic stripe support (9) is made into bottom for plane, both sides, top are with the integral section of magnetic stripe mounting groove (9-1), described magnetic stripe (10) has two, and two magnetic stripes (10) embed respectively in the magnetic stripe mounting groove (9-1) of both sides.