TWI619659B - Sheet conveyor - Google Patents

Abstract

A thin plate conveying device includes a base, an air floating plate, a first driving motor and a second driving motor, at least two pairs of transmission wheels, at least two transmission belts, and two first non-contact sensors. The base has a first transmission wheel setting end and a second transmission wheel setting end opposite to each other. Each pair of transmission wheels has a first transmission wheel and a second transmission wheel. The two first non-contact sensors are respectively disposed on the first transmission wheel setting end and the second transmission wheel setting end of the base and are electrically connected to the first driving motor and the second driving motor, respectively, for determining whether a thin plate occurs. deflection. Therefore, when the sheet is deflected, the two first non-contact sensors transmit a correction signal to the first driving motor and the second driving motor, so that the rotating shaft of the first driving motor and the rotating shaft of the second driving motor. Rotate at different speeds.

Description

Sheet conveying device

The present invention relates to a thin-plate conveying device, and more particularly, to a thin-plate conveying device that can be used to correct a deviation generated during the conveying of a thin plate.

Conveying fragile sheets, such as glass sheets with a thickness of only 0.3 to 0.7 mm, is a necessary process in the production of panels. Generally, a conventional apparatus for carrying a thin plate includes a base, a plurality of pairs of rollers, a conveyor belt, and a drive motor. Two rollers in each pair of rollers are respectively disposed on the two sides of the base and are driven to rotate by a driving motor, and the transmission belt is sleeved between the two rollers and moved by the load sheet.

During the transportation of the thin plate, due to the lateral friction between the thin plate and the conveyor belt, the rollers receive the lateral component force of the conveyor belt, etc., the lateral displacement of the thin plate often occurs, which causes the thin plate to collide with the conveyor damage. In the prior art, there are elastic baffles on both sides of the conveying device, in addition to avoiding damage to the sheet due to collision, it can also correct the deflection of the sheet. In addition, the Republic of China Patent I465381 proposed the use of a special roller shape to achieve the effect equivalent to a baffle.

However, the solutions in the prior art still need to be improved, because the technology of limiting the position of the thin plate by contact will inevitably cause friction between the thin plate and the baffle, causing the retaining wall to generate dust and adhere to the thin plate. It affects the quality of the sheet. Especially with the advancement of thin plate technology at any time, the thickness of the thin plate material is getting thinner and thinner. For thin plates with a thickness of less than 0.4mm, this kind of contact baffle not only generates the above-mentioned dust problem, but also easily breaks the glass.

The technical problem to be solved by the present invention is to provide for the shortcomings of the prior art. A thin plate conveying device includes a base, an air floating plate, a first driving motor and a second driving motor, at least two pairs of transmission wheels, at least two transmission belts, and two first non-contact sensors. The base has a first transmission wheel setting end and a second transmission wheel setting end opposite to each other. The air floating plate is disposed between the first transmission wheel setting end and the second transmission wheel setting end of the base. The first driving motor and the second driving motor each have a rotating shaft and are respectively disposed on the first transmission wheel setting end and the second transmission wheel setting end of the base. Each pair of the transmission wheels has a first transmission wheel and a second transmission wheel, and the first transmission wheel and the second transmission wheel are respectively disposed at the first transmission wheel setting end of the base and The second transmission wheel setting end, wherein at least two of the first transmission wheels on the first transmission wheel setting end are juxtaposed along an extending direction of the first transmission wheel setting end, and the second transmission wheel At least two of the second transmission wheels on the setting end are juxtaposed along the extending direction of the setting end of the second transmission wheel, wherein the rotating shaft of the first drive motor is connected to one of the first transmission wheels to drive It rotates, and the rotating shaft of the second drive motor is connected to one of the second transmission wheels to drive it to rotate. The at least two transmission belts are used to carry a thin plate, and each of the transmission belts is respectively set on the first transmission wheel installation end and two adjacent first transmission wheels and the second transmission wheel are disposed. Two adjacent second transmission wheels on each end, the first transmission wheel connected to the first drive motor and the second transmission wheel connected to the second drive motor are respectively connected by at least two Each of the transmission belts drives the first transmission wheel that is not connected to the first drive motor and the second transmission wheel that is not connected to the second drive motor to rotate, thereby causing the sheet to move along a Move in a predetermined direction. The two first non-contact sensors are respectively disposed on the first transmission wheel setting end and the second transmission wheel setting end of the base, and are electrically connected to the first driving motor and the first transmission motor. The second driving motor, the first non-contact sensor is used to judge whether the thin plate is deflected, and when the thin plate is deflected, a required correction signal is transmitted to the first driving motor and the second A drive motor such that the rotation shafts of the first drive motor and the second drive motor Rotate at different speeds. When the thin plate is moved to deflect by a predetermined angle toward a predetermined deflection direction, the rotating shafts of the first driving motor and the second driving motor are respectively rotated at different speeds according to the required correction signal, so that the thin plate The predetermined angle is deflected in a direction opposite to the predetermined deflection direction.

Another technical solution of the present invention provides a sheet conveying device, which includes a first driving motor, a second driving motor, and two first non-contact sensors. The first driving motor and the second driving motor each have a rotating shaft to drive a thin plate to move in a predetermined direction. The two first non-contact sensors are electrically connected to the first driving motor and the second driving motor, respectively. When the sheet is deflected by a predetermined angle toward a predetermined deflection direction, the two first non-contact sensors transmit a required correction signal to the first driving motor and the second driving motor, so that the The rotating shaft of the first driving motor and the rotating shaft of the second driving motor are rotated at different speeds respectively, so that the thin plate is deflected by the predetermined angle opposite to the predetermined deflection direction.

The beneficial effect of the present invention is that a thin-plate conveying device provided by the technical solution of the present invention can be respectively provided at the first transmission wheel installation end of the base and the first transmission wheel through "two first non-contact sensors". The installation end of the second transmission wheel is electrically connected to the first driving motor and the second driving motor, and the first non-contact sensor is used to determine whether the thin plate is deflected, and is connected to the thin plate. When a deflection occurs, a correction-required signal is transmitted to the first driving motor and the second driving motor, so that the rotating shaft of the first driving motor and the rotating shaft of the second driving motor are different from each other. The technical feature of "speed rotation" is to achieve "when the sheet moves and deflects by a predetermined angle toward a predetermined deflection direction, the rotation axes of the first drive motor and the second drive motor are respectively modified according to the required signal The technical effect of rotating at different speeds to deflect the sheet by the predetermined angle opposite to the predetermined deflection direction.

In order to further understand the features and technical contents of the present invention, please refer to the following detailed description of the present invention and the accompanying drawings, but the accompanying drawings are provided for reference and reference only. The purpose of illustration is not to limit the present invention.

Z‧‧‧ Sheet conveying device

1‧‧‧ base

11‧‧‧The first transmission wheel setting end

12‧‧‧ second transmission wheel setting end

13‧‧‧ Conveying start

14‧‧‧ transport end

2‧‧‧air floating plate

21‧‧‧The first air float plate

22‧‧‧Second Air Float Plate

31‧‧‧first drive motor

32‧‧‧second drive motor

4‧‧‧ transmission wheel

41‧‧‧The first transmission wheel

411a, 411b, 411c‧‧‧First round

42‧‧‧Second Transmission Wheel

421a, 421b, 421c‧‧‧Second round

5‧‧‧ transmission belt

6‧‧‧The first non-contact sensor

7‧‧‧Second non-contact sensor

B‧‧‧ Sheet

G‧‧‧Circular groove

D1‧‧‧First target

D2‧‧‧Second target

FIG. 1 is a schematic plan view of a sheet conveying device according to a first embodiment of the present invention when it is used to convey a glass sheet.

FIG. 2 is an enlarged schematic view of a first non-contact sensor of a sheet conveying device of the present invention.

FIG. 3 is an enlarged schematic view of a first transfer wheel setting end of the sheet conveying device according to the first embodiment of the present invention.

FIG. 4 is a schematic top view of a sheet conveying device according to a second embodiment of the present invention when it is used to convey a glass sheet.

5 is a schematic perspective view of a sheet conveying device according to a second embodiment of the present invention when it is used to convey a glass sheet.

FIG. 6 is an enlarged schematic diagram of a second non-contact sensor of a sheet conveying device according to a second embodiment of the present invention.

The following is a description of specific embodiments of the “thin plate conveying device” disclosed in the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention may be implemented or applied through other different specific embodiments, and various details in this specification may also be based on different viewpoints and applications, and various modifications and changes may be made without departing from the spirit of the present invention. In addition, the drawings of the present invention are merely a schematic illustration, and are not described in terms of actual dimensions. The following embodiments will further describe the related technical content of the present invention in detail, but the disclosed content is not intended to limit the technical scope of the present invention.

[First embodiment]

Please refer to FIG. 1 to FIG. 3. The present invention provides a sheet conveying device Z, which includes a base 1, an air floating plate 2, a first driving motor 31 and a second driving motor 32, at least two pairs of transmission wheels, and at least two Transmission belts and two first non-contact sensors 6. In detail, the base 1 has a first transmission wheel setting end 11, a second transmission wheel setting end 12, a transport start end 13, and a transport end end 14 opposite to each other. The air floating plate 2 is disposed between the first transmission wheel setting end 11 and the second transmission wheel setting end 12 of the base 1, and the air floating plate 2 extends between the transport start end 13 and the transport end end 14.

As shown in FIG. 1, the number of air floating plates 2 in this embodiment is two. Specifically, the air floating plates 2 include a first air floating plate 21 and a second air floating plate 22. However, the present invention does not limit the number of the air floating plates 2. With the development of thin plate technology, the thickness of thin plates has become thinner and thinner, so that thin plates are often easy to bend like paper. Therefore, the present invention supports the thin plate B in a non-contact manner through the arrangement of the air floating plate 2 so that the thin plate B can be transported forward parallel to the ground smoothly, and not only can the thin plate B be prevented from being damaged due to bending during the transportation process. , Can also reduce the friction between the thin plate B and the transmission belt, thereby reducing the probability of the thin plate B shifting left and right. The first driving motor 31 and the second driving motor 32 each have a rotating shaft (not shown) and are respectively disposed on the first transmission wheel setting end 11 and the second transmission wheel setting end 12 of the base 1.

Further, each pair of transmission wheels has a first transmission wheel 41 and a second transmission wheel 42. The first transmission wheel 41 and the second transmission wheel 42 are respectively disposed at the first transmission wheel setting end 11 and the second transmission wheel setting end 12 of the base 1, wherein at least two first The transmission wheels 41 are juxtaposed along the extending direction of the first transmission wheel setting end 11, and at least two second transmission wheels 42 on the second transmission wheel setting end 12 are juxtaposed along the extension direction of the second transmission wheel setting end 12. Specifically, as shown in FIG. 1, the first transmission wheel 41 and the second transmission wheel 42 are closely arranged at a fixed pitch. This is because the thin sheet material is easily deformed like paper, and therefore, it is compact in the above manner. The arrangement of the first transfer wheel 41 and the second transfer wheel 42 enables the sheet material to be smoothly conveyed by the transfer belt 5 without the occurrence of a downward depression.

Please refer to FIG. 1 and FIG. 3. The rotation shaft of the first driving motor 31 is connected to one of the first transmission wheels 41 to drive the rotation thereof, and the rotation shaft of the second driving motor 32 is connected to One of the second transmission wheels 42 is connected to drive the second transmission wheel 42. In detail, the driving motors (31, 32) used in the present invention are stepping motors, which can accurately control the speed and have the advantages of high stability. However, the present invention is not limited to the types of motors used.

As shown in FIG. 3, the sheet conveying device Z of the present invention includes at least two transmission belts 5 for carrying the sheet B, and each of the transmission belts 5 is respectively sleeved on the first transmission wheel setting end 11 and each two adjacent first transmissions Each of the wheel 41 and the second transmission wheel setting end 12 has two adjacent second transmission wheels 42. The first transmission wheel 41 connected to the first driving motor 31 and the second transmission wheel 42 connected to the second driving motor 32 respectively drive the first transmission wheel 31 not connected to the driving first driving motor 31 by at least two transmission belts 5. The transmission wheel 41 and the second transmission wheel 42 not connected to the second drive motor 32 rotate, thereby further moving the thin plate B in a predetermined direction.

It should be noted that the setting methods of the transmission wheels (41, 42), the first and second drive motors (31, 32), and the transmission belt 5 on the first transmission wheel setting end 11 and the second transmission wheel setting end 12 are mutual. Correspondingly, FIG. 3 shows only the end of the first transmission wheel setting end 11 as an example. Further, in this embodiment, as shown in FIG. 1 and FIG. 3, the first transmission wheel 41 connected to the rotating shaft of the first driving motor 31 is disposed at the extreme end of the first transmission wheel setting end 11 and is connected to the first The second transmission wheel 42 connected to the rotating shaft of the two driving motors 32 is disposed at the extreme end of the second transmission wheel setting end 12. However, the present invention is not limited to this. The first transmission wheel 41 may be provided between two first transmission wheels 41 which are not connected to the first drive motor 31. Similarly, the second transmission wheel 42 may be provided between the two first transmission wheels 41. The driving motor 32 is connected between two second transmission wheels 42. In addition, the present invention does not limit the rotation directions of the rotation shafts of the first driving motor 31 and the second driving motor 32. It means that the thin plate B can be transmitted from one end of the base 1 to the other end of the base 1. .

In the prior art sheet conveying device, a motor is arranged on the rotating shaft of each transmission wheel, and all transmission wheels are sleeved with a belt on each side of the sheet conveying device. However, conveying the sheet in this way easily loosens the belt and restricts it. The conveying speed of the thin plate. In this embodiment, each two adjacent transfer wheels on both sides of the sheet conveying device Z are sheathed with a skin. The belt can speed up the conveying speed of the thin plate B, and can improve the shortcoming of the belt being easily slackened.

Please refer to FIG. 1 to FIG. 3. The sheet conveying device Z according to the first embodiment of the present invention further includes two first non-contact sensors 6, which are respectively disposed on the first transmission wheel setting end 11 of the base 1 and The second transmission wheel setting end 12 is electrically coupled to the first driving motor 31 and the second driving motor 32, respectively. The first non-contact sensor 6 is used to determine whether the thin plate B is deflected, and when the thin plate B is deflected, a correction signal is transmitted to the first driving motor 31 and the second driving motor 32 to make the first driving motor 31 And the rotating shafts of the second driving motor 32 are respectively rotated at different speeds. In detail, when the thin plate B is deflected by a predetermined angle in a predetermined deflection direction, the two first non-contact sensors 6 transmit a required correction signal to the first driving motor 31 and the second driving motor 32 so that the first The rotating shaft of the driving motor 31 and the rotating shaft of the second driving motor 32 are respectively rotated at different speeds, and the thin plate B is deflected by a predetermined angle opposite to a predetermined deflection direction, thereby allowing the thin plate B to continue to advance in the conveying direction before being deflected.

With the above-mentioned technical means, when the sheet conveying device Z of the present invention is deflected during the conveying process of the sheet B, the rotation shafts of the first driving motor 31 and the second driving motor 32 respectively disposed on both sides of the base 1 are at different speeds. By rotating, the transmission belt 5 sleeved on the first transmission wheel 41 and the transmission belt 5 sleeved on the second transmission wheel 42 will run at different speeds, thereby correcting the deflection of the sheet B. In this way, the deflection correction of sheet B is a dynamic correction, that is, it is not necessary to stop the conveying device or reduce the speed of the conveying device to correct the direction of sheet B, which can increase the processing efficiency of sheet B, and also improve the sheet conveying device in the prior art to The contact baffle limits the possible dust problems caused by the left and right deflection of the sheet.

Further, in this embodiment, the first non-contact sensor 6 is a photo-sensor, more specifically, a photo-sensor using optical strip sensing. Two first non-contact sensors 6 are disposed on both sides of the base 1 to detect whether the sheet B is shifted left and right. However, the present invention is not limited to the type of the first non-contact sensor 6, for example, in other embodiments, the first non-contact sensor 6 may also be a visual sensor.

In addition, please refer to FIG. 2 and FIG. 3, each of the first transmission wheels 41 and The second transmission wheel 42 includes three first wheels (411a, 411b, 411c) and three second wheels (421a, 422b, 422c), and each first wheel (411a, 411b, 411c) is coaxially arranged, And each second wheel (421a, 422b, 422c) is arranged coaxially. Every two adjacent first rounds (411a, 411b, 411c) and every two adjacent two second rounds (421a, 422b, 422c) jointly define an annular groove G to accommodate the transmission belt 5 . It should be noted that the present invention does not limit the number of the first round and the second round, and FIG. 3 only shows the first round (411a, 411b, 411c) as an example. The type of the second round is similar to that of the second round. The setting method on the second transmission wheel setting end 12 should correspond to that shown in FIG. 3. Further, each first wheel (411a, 411b, 411c) is integrally formed, and each second wheel (421a, 422b, 422c) is integrally formed. With the setting of the first round (411a, 411b, 411c) and the second round (421a, 422b, 422c) and each of the first round (411a, 411b, 411c) and each of the second round (421a, 422b, 422c) is a technical feature of integral molding, and the conveyer belt 5 can run more stably to convey the sheet B.

[Second embodiment]

Please refer to FIG. 4 and FIG. 5. FIG. 4 and FIG. 5 show a sheet conveying device Z according to a second embodiment of the present invention. Elements in the second embodiment corresponding to the first embodiment have the same functions and reference numerals, and are not repeated here. The difference between the second embodiment of the present invention and the first embodiment is that compared with the first embodiment having two first non-contact sensors 6, the second embodiment has four first non-contact sensors 6, The deflection of the sheet B can be detected in a more timely manner. In addition, the second embodiment further includes two second non-contact sensors 7 as described below.

Please refer to FIG. 6, two second non-contact sensors 7 are respectively disposed corresponding to a first target D1 on the first transmission wheel 41 and a second target D2 on the second transmission wheel 42. Correspondingly, the two second non-contact sensors 7 are respectively configured to sense a first current rotation speed signal and a second current rotation speed signal generated by the first target D1 and the second target D2. It should be noted that FIG. 6 only shows the first A second non-contact sensor 7 on the transmission wheel setting end 11 and a first target D1 corresponding to the second non-contact sensor 7 are disposed on the second transmission wheel setting end 12. The setting method of D2 corresponds to that shown in FIG. 6.

Furthermore, the two second non-contact sensors 7 are electrically connected to the first driving motor 31 and the second driving motor 32, respectively, so as to receive a first preset speed signal and a second A second preset speed signal of the driving motor 32. In detail, by comparing the received first current rotation speed signal with the first preset speed signal, and comparing the second current rotation speed signal with the second preset speed signal, the second non-contact sensor 7 can It is judged whether the rotation speed of the transmission wheels (41, 42) is different from the rotation speed of the drive motors (31, 32) respectively, and then it can be judged whether the transmission belt 5 is loose, needs to be adjusted or damaged and needs to be replaced.

Specifically, in this embodiment, the second non-contact sensor 7 is a photo interrupter, and the first target D1 and the second target D2 are sensing screws. However, the present invention is not limited to this. In other embodiments, the second non-contact sensor 7, the first target D1, and the second target D2 may be implemented in other ways.

In summary, the beneficial effect of the present invention is that a sheet conveying device Z provided by the technical solution of the present invention can be provided on the first transmission wheel of the base 1 through "two first non-contact sensors 6 respectively". The setting end 11 and the second transmission wheel setting end 12 are electrically connected to the first driving motor 31 and the second driving motor 32, respectively, and the "first non-contact sensor 6 is used to determine whether the sheet B is deflected, and When the thin plate B is deflected, a correction signal is transmitted to the first driving motor 31 and the second driving motor 32, so that the rotating shafts of the first driving motor 31 and the second driving motor 32 rotate at different speeds, respectively. "When the thin plate B moves to deflect by a predetermined angle in a predetermined deflection direction, the rotating shafts of the first driving motor 31 and the second driving motor 32 are rotated at different speeds according to the required correction signals, so that the thin plate B is opposite to the predetermined deflection direction. Technical effect of deflection of said predetermined angle ". Thus, the sheet conveying device Z of the present invention can achieve the dynamic correction and non-contact correction of sheet B, increase the processing rate of sheet B, and reduce the generation of dust during sheet B conveying.

The above are only the preferred and feasible embodiments of the present invention, and therefore do not limit the patent scope of the present invention. Therefore, all equivalent technical changes made by using the description and drawings of the present invention are included in the protection scope of the present invention.

Claims (10)

A thin-plate conveying device includes a base having a first transfer wheel setting end, a second transfer wheel setting end, a transfer start end, and a transfer end end opposite to each other; an air floating plate, The air floating plate is disposed between the first transmission wheel setting end and the second transmission wheel setting end of the base, and the air floating plate integrally extends between the transportation start end and the transportation Between the end ends; a first drive motor and a second drive motor, each of the first drive motor and the second drive motor having a rotating shaft and disposed on the first transmission wheel of the base; And at least two pairs of transmission wheels, each pair of transmission wheels having a first transmission wheel and a second transmission wheel, the first transmission wheel and the second transmission wheel The first transmission wheel setting end and the second transmission wheel setting end are respectively disposed on the base, wherein at least two of the first transmission wheels on the first transmission wheel setting end are along the Extension side of the first transmission wheel setting end Juxtaposed, and at least two of the second transmission wheels on the set end of the second transmission wheel are juxtaposed along the extending direction of the set end of the second transmission wheel, wherein the rotation shaft of the first drive motor is connected therein One of the first transmission wheels to drive its rotation, and the rotation shaft of the second drive motor is connected to one of the second transmission wheels to drive its rotation; at least two transmission belts for carrying a thin plate, Each of the transmission belts is sleeved on each of the two adjacent first transmission wheels on the setting end of the first transmission wheel and each of the two adjacent second transmission wheels on the setting end of the second transmission wheel. The first transmission wheel connected to the first drive motor and the second transmission wheel connected to the second drive motor are respectively driven by at least two of the transmission belts A first transmission wheel connected to a driving motor and the second transmission wheel not connected to the second driving motor Turn, so that the sheet moves in a predetermined direction; and two first non-contact sensors, the two first non-contact sensors are respectively disposed on the first transmission wheel of the base. And the second transmission wheel are provided with ends and electrically connected to the first driving motor and the second driving motor, respectively, and the first non-contact sensor is used to determine whether the sheet is deflected, and When the sheet is deflected, a correction signal is transmitted to the first driving motor and the second driving motor, so that the rotating shafts of the first driving motor and the second driving motor are at different speeds, respectively. Rotation; wherein when the thin plate is moved to deflect by a predetermined angle in a predetermined deflection direction, the rotation shaft of the first drive motor and the rotation shaft of the second drive motor are respectively different according to the required correction signal The speed is rotated to deflect the thin plate by the predetermined angle opposite to the predetermined deflection direction. The sheet conveying device according to claim 1, wherein the first non-contact sensor is a photo sensor. The sheet conveying device according to claim 1, wherein the first non-contact sensor is a vision sensor. The sheet conveying device according to claim 1, wherein each of the first transfer wheels includes at least two first wheels, each of the second transfer wheels includes at least two second wheels, and each of the The first wheel is arranged coaxially, and each of the second wheels is arranged coaxially. Each two adjacent first wheels and each two adjacent two second wheels jointly define an annular groove. A groove, and the annular groove is used for accommodating the transmission belt. The sheet conveying device according to claim 4, wherein each of the first-time wheels is integrally formed, and each of the second-time wheels is integrally formed. The sheet conveying device according to claim 1, further comprising: two second non-contact sensors, the two second non-contact sensors and a first on the first transmission wheel respectively. The corresponding setting of the target and the second transmission wheel A second target is provided correspondingly, and the two second non-contact sensors are respectively configured to sense a first current rotation speed signal and a first current speed signal generated by the first target and the second target. Two current rotation speed signals. The sheet conveying device according to claim 6, wherein the two second non-contact sensors are electrically connected to the first driving motor and the second driving motor, respectively, so as to receive the first driving motor respectively. A first preset speed signal of the drive motor and a second preset speed signal of the second drive motor. The sheet conveying device according to claim 6, wherein the second non-contact sensor is a photo interrupter. The sheet conveying device according to claim 6, wherein the first target object and the second target object are sensing screws. A thin-plate conveying device includes a base having a first transfer wheel setting end, a second transfer wheel setting end, a transfer start end, and a transfer end end opposite to each other; an air floating plate, The air floating plate is disposed between the first transmission wheel setting end and the second transmission wheel setting end of the base, and the air floating plate integrally extends between the transportation start end and the transportation Between the end ends; a first drive motor and a second drive motor, each of the first drive motor and the second drive motor having a rotating shaft and disposed on the first transmission wheel of the base; And the second transmission wheel are provided with ends to drive a thin plate to move in a predetermined direction; and two first non-contact sensors, and the two first non-contact sensors are respectively disposed on the base. The first transmission wheel setting end and the second transmission wheel setting end are electrically connected to the first driving motor and the second driving motor, respectively, wherein when the thin plate is deflected toward a predetermined deflection direction by- At predetermined angle Two of said first non-contact sensor will transmit a correction signal required to drive the first motor and the second drive motor, said first drive motor to cause the The rotating shaft and the rotating shaft of the second drive motor are rotated at different speeds respectively, so that the thin plate is deflected by the predetermined angle opposite to the predetermined deflection direction.