JPH09123680A - Writing board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration of erasing performance of a writing board such as an office electronic blackboard caused by electrostatic adhesion of erasing waste on a writing sheet when a written image on the writing sheet is rubbed out. SOLUTION: An erasing roller 25 is provided on a writing sheet 15 so that it can freely come in contact with and away from the writing sheet 15. Brush bristles 25b made of electrical conductor are provided on a roller spindle 25a of the erasing roller 25 for grounding. When a written image is erased, the erasing roller 25 is rotated and pressed on to the writing sheet 15 and the writing sheet 15 is rolled to rub out the written image with the erasing roller 25. Even if an static electricity is generated by the friction between the erasing roller 25 and the writing sheet 15, the static electricity is released outside through the erasing roller 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing board for writing images such as letters and pictures using a writing instrument, such as an office electronic blackboard, a children's drawing board, a bulletin board, and a message board.

[0002]

2. Description of the Related Art Conventionally, an endless writing sheet 2 is wound around a drive board 1a and a driven roller 1b, as shown in FIG. There is a configuration in which a roller 3 for image erasing is provided to the sheet 2 so as to be able to come into contact with and separate from the sheet 2. The roller 3 is provided with a spiral brush 3a on the outer circumference.

[0003] When using the electronic blackboard,
An image is written on the writing sheet 2 with a writing instrument such as a water-based pen.

On the other hand, when erasing the written image,
A solenoid indicated by reference numeral 4 in FIG. 8 is actuated to pull the connecting shaft 5 and the arms 6 attached to both ends of the connecting shaft 5 are rotated around the support shaft 7 and the roller 3 held by the tip of the arm 6 is rotated. The brush 3a is pressed against the surface of the writing sheet 2.
Then, while the writing sheet 2 is rotated, the roller driving motor M is driven to rotate the roller 3, and the brush 3
The written image was erased with a.

In another electronic blackboard, for example, FIG.
As shown in FIG. 3, there is a configuration in which an endless belt 9 for image erasing, which is stretched between a driving roller 8a and a driven roller 8b, is provided on the roller winding portion 2a of the writing sheet 2 so as to be freely contactable and separable.

When the written image is erased, the endless belt 9 is pressed against the roller winding portion 2a to rotate the writing sheet 2, and the endless belt 9 is also rotated to write the image on the writing sheet 2. Was scraping away.

[0007]

However, in the above-mentioned conventional apparatus, when the writing image is erased by rubbing the writing sheet 2 with the roller 3 or the belt 9, the erase dust is generated by the static electricity generated by the friction. However, there is a problem that the erasing performance is deteriorated by the adhesion to the surface of the.

Further, conventionally, when erasing a written image,
The eraser residue of the written image is scraped off by the roller 3 and the belt 9 and adheres to the brush 3 a of the roller 3 or the belt 9. However, if the erased residue adheres to the brush 3a or the belt 9 too much over time, the written image cannot be effectively scratched off by them, and as a result, the erasing performance similarly deteriorates.

Therefore, an object of the present invention is that, in the writing board such as the above-mentioned electronic blackboard for office work, the erasing member such as the roller or the belt has too much erase dust or the erase dust is electrostatically attached on the writing sheet. The purpose is to prevent the erasing performance from being deteriorated.

[0010]

Therefore, the invention described in claim 1 is, for example, as in the following embodiment.
When an image is written on the writing sheet 15 with a writing instrument and then the writing image P is erased, an erasing member such as an erasing roller 25 is pressed against the writing sheet 15 and moved relative to the writing sheet 15 so that the writing image P is erased. Written image P
In the writing board for erasing, the erasing member is formed of a conductive material and is grounded.

When the written image P is erased, static electricity generated by friction between the erasing member and the writing sheet 15 is released to the outside through the erasing member.

According to the second aspect of the present invention, when an image is written on the writing sheet 15 with a writing instrument and then the written image P is erased, as in the following embodiment, the erase roller 25 is used. In a writing board in which an erasing member is pressed against the writing sheet 15 and the writing image P on the writing sheet 15 is erased by relative movement with respect to the writing sheet 15, an erasing residue d that comes into contact with the erasing member and adheres thereon is removed. It is characterized by comprising a cleaning member such as the cleaning roller 40 to be removed.

Then, when the written image P is erased, the erasing dust d adhering to the erasing member is removed by the cleaning member.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an office electronic blackboard according to the first aspect of the invention. In FIG. 1, the electronic whiteboard for business is shown with a front writing side lying on a mounting table (not shown).

Reference numeral 10 in the figure denotes an outer case of the electronic blackboard. As shown by the chain line, the outer case 10 has a relatively horizontally long box shape on the left and right sides in the drawing, and although not shown, a horizontally long writing window is also formed on the front writing side.

In the outer case 10, a back plate 12 is provided on the back side of the writing window. And
The drive roller 13 and the driven roller 14 are arranged on both sides of the back plate 12 in the length direction, with the roller shafts 13a and 14a oriented in the width direction of the back plate 12. Then, it is rotatably supported by support plates 16 and 17 provided on both sides in the width direction so as to face each other. The support plates 16 and 17 are made of conductive metal plates. Then, the endless writing sheet 15 is hung between the rollers 13 and 14, and the tensioned springs 18 hung on both ends of the driven roller 14 urge it to stretch it.

The writing sheet 15 is surface-processed so that the written image can be easily erased while the image can be written using a writing instrument such as a water-based pen. The back side of the front side is backed with the back plate 12, and the front side of the backing portion is exposed to the outside through the writing window.

A sheet drive motor 20 is provided on one end side (upper side in FIG. 1) of the drive roller 13. Then, the belt 23 is stretched between the motor pulley 21 provided on the motor shaft 20a of the seat drive motor 20 and the transmission pulley 22 provided at the upper end of the roller shaft 13a. Therefore, the driving force of the sheet driving motor 20 can be transmitted to the driving roller 13 via the belt 23.

As the driving roller 13, a rubber roller such as chloroprene rubber or urethane rubber having a relatively large coefficient of friction and a high elasticity is used.

Further, in the outer case 10, an automatic erasing device A is provided on the right side of the drive roller 13 in FIG.

The automatic erasing device A is provided with an erasing roller 25 on the back side (lower side in FIG. 1) of the driving roller 13 in parallel therewith. The erasing roller 25 has, for example, a roller shaft 25a formed of a conductive metal pipe, and a large number of bristles 25b made of a conductive material such as carbon fiber are planted in a brush shape on the outer periphery of the roller shaft 25a. Become. And
Connect both ends of the roller shaft 25a to the rectangular holes 2 of the support plates 16 and 17.
4 through bearings 26, respectively, erasing roller 25
Is rotatably supported by the support plates 16 and 17. As shown in FIG. 2, a compression spring 28 is provided in the rectangular hole 24 and pressed against the bearing 26 to constantly bias the erasing roller 25 toward the drive roller 13.

The erasing roller 25 is grounded. For example, the tip of a conductive leaf spring (not shown) attached to one support plate 16 is pressed against one end of the roller shaft 25a, and the erasing roller 25 is grounded via the leaf spring and the support plate 16.

Thus, the erasing roller driving motor 30 is attached to the inner surface of the other supporting plate 17 on the right end side in FIG. Then, the belt 33 is stretched between the motor pulley 31 provided on the motor shaft of the roller drive motor 30 and the pulley 32 provided at the lower end of the roller shaft 25a. Then, the driving force of the roller driving motor 30 is transmitted to the erasing roller 25 via the belt 33, and the erasing roller 25 can be rotated at a rotation speed about 20 times that of the driving roller 13.

As shown in FIGS. 1 and 2, the automatic erasing device A has a writing sheet 1 near the erasing roller 25.
A rotating shaft 34 is provided on the back side of the unit 5. The rotation shaft 34 is provided in parallel with the roller shaft 25a, and is rotatably supported by the support shafts 16 and 17. Then, the base ends of elongated plate-shaped arms 35 provided in the direction perpendicular to the rotary shaft 34 are screwed to both ends of the rotary shaft 34. On the arm 35, the pressing protrusion 3 of the operation shaft 36 is provided.
6a is pressed. The operation shaft 36 has the pressing protrusion 36.
It has a knob portion 36b at the upper end opposite to a in the figure, and is supported by a support member (not shown) so as to be movable in the vertical direction in the figure and rotatable about its axis.

Therefore, the pressing protrusion 36a is attached to the support plate 17
It is locked in the horizontally long locking hole 37, and the tip of the arm 35 is pressed against the roller shaft 25a against the compression coil spring 28. Therefore, the erasing roller 25 is normally held at the pressing release position separated from the writing sheet 15.

According to the second aspect of the invention, as shown in FIG. 1, a cleaning roller 40 is provided on the right side of the erasing roller 25, and the cleaning roller 40 is brought into contact with the erasing roller 25.

The cleaning roller 40 is made of an adhesive material,
For example, it is formed into a roller shape by using low hardness silicone rubber, low hardness thermoplastic elastomer or the like. Alternatively, an adhesive sheet may be attached to the outer periphery of the roller member.
Then, the circumferential grooves of the annular bearings 41 provided at both ends of the roller shaft 40a are fitted to the edges of the notch holes 39 of the support plates 16 and 17 which are vertically long in FIG. Then, the cleaning roller 40 is rotatably laid between the support plates 16 and 17 and brought into contact with the erasing roller 25.

Further, the annular bearing 41 is pressed from the upper side in FIG. 1 by the elongated leaf spring 45, and the cleaning roller 40 is detachably attached to the notch hole 39. The leaf spring 45 is
The front end 45a has an L shape, and the base end 45b has a support plate 16.1.
Attach it to step 7 using stepped screws with a slight gap. Then, the tip 45a is attached to the small hole 42 of the support plate 16/17.
The leaf spring 45 is pressed against the outer circumference of the annular bearing 41 in a state in which the leaf spring 45 is locked.

Although not shown, the electronic blackboard described above is provided with a reading means for reading an image written on the writing sheet 15 and a printer for printing out the read contents on a sheet.

When using the electronic blackboard described above, an image such as a picture or a character is written on the surface of the writing sheet 15 with a writing instrument as appropriate. To continue writing a new image without erasing the written image, turn on the power and press the sheet feed button (not shown) to press the sheet drive motor 2
0 is driven, the writing sheet 15 is fed in the direction of arrow a in FIG. 1, and the portion in which nothing is written is fed out.

When it is desired to save the written image, a copy button (not shown) is pressed to drive the sheet drive motor 20, the writing sheet 15 is sent, the written image on the sheet is read by the reading means, and the read content is read. Record on paper with a printer.

On the other hand, when the written image is erased by the automatic erasing apparatus A, an erasing button (not shown) is pressed, the roller driving motor 30 is driven, and the erasing roller 25 is rotated in the arrow X direction in FIG. Then, the operation shaft 36, the knob portion 36b
3 is picked up and turned, and as shown in FIG. 3, the pressing protrusion 36a is removed from the hooking hole 37, pulled out, and appropriately stopped by hitting a stopper. Then, due to the biasing force of the compression coil spring 28,
The erasing roller 25 is moved upward in FIG.
Press on 5. Then, the sheet feed button is pressed to feed the writing sheet 15 in the direction of arrow a in FIG. 4, and the writing image P is erased by the erasing roller 25.

Since the erasing roller 25 is grounded when the image is erased, even if static electricity is generated by friction with the writing sheet 15, the static electricity is released to the outside through the erasing roller 25.

Therefore, as shown in FIG. 4, the erased dust d rubbed off by the erasing roller 25 does not electrostatically adhere to the surface of the writing sheet 15, and the pen tray ( (Not shown). In addition, the erasing residue d attached to the brush bristles 25b of the erasing roller 25 directly adheres to the cleaning roller 40 that rotates together with the erasing roller 25 and is removed from the brush bristles 25b.

After the image is erased, the operation shaft 36 is pushed in and then rotated, and the pressing protrusion 36a is fitted into the latch hole 37 as shown in FIG.
5a is pressed to return the erasing roller 25 to the original pressing release position. Then, a stop button (not shown) is pressed to stop the driving of the sheet drive motor 20 and the roller drive motor 30.

By the way, after repeatedly erasing the image,
When the surface of the cleaning roller 40 is soiled with the eraser d, the cleaning roller 40 is replaced with a new one.

In this case, as shown in FIG. 5, the leaf spring 45 is pushed by a finger so that the L-shaped tip 45a is made into the small hole 42 of the support plate 17.
And the pressing of the cleaning roller 40 by the leaf spring 45 is released. Then, as shown in FIG. 1, the exterior cover 10 provided on the upper side of the cleaning roller 40 in the drawing.
The opening / closing cover 11 is opened, and the cleaning roller 40 is removed from the notch hole 39.

By the way, the above-mentioned erasing roller 25 is one in which brush bristles 25b are planted around the entire circumference of the roller shaft 25a. However, for example, as shown in FIG. 6, a brush shaft 25a on which brush bristles 25b are planted in a spiral shape may be used, or as shown in FIG. May be.

Further, in the above-described embodiment, the erasing roller 25 is used as the erasing member, but, for example, an endless belt wound between a plurality of rollers is used as the erasing member, and the belt is pressed against the writing sheet to perform writing. The image can be erased.

Furthermore, in the above-described embodiment, such an erasing member and a writing sheet are both rotated to erase the written image. However, since the written image is scratched if the erasing member and the writing sheet move relative to each other, only one of the erasing member and the writing sheet may be rotated. Further, the writing image may be erased by linearly reciprocating, not limited to the case of rotating them.

Further, in the case where the one erasing member side does not move, for example, a fixed blade can be used as the erasing member and pressed against the writing sheet. In the case where the writing sheet side does not move, for example, a fixed board can be used as the writing sheet.

In the above-described embodiment, the cleaning roller 40 is used as a cleaning member, and the eraser dust adhering to the erasing roller 25 is removed due to its adhesiveness. However, the invention is not limited to this case, and for example, a cleaning blade is used. It is also possible to remove the eraser dust by scraping it off.

[0043]

Therefore, according to the first aspect of the invention, since the erasing member is made of a conductive material and is grounded, static electricity generated by friction with the writing sheet at the time of erasing a written image is It escapes to the outside through the erasing member, whereby it is possible to prevent electrostatic debris scraped off by the erasing member from electrostatically adhering to the surface of the writing sheet, and as a result, the conventional problem that the erasing performance deteriorates is solved. be able to.

According to the second aspect of the present invention, a cleaning member that comes into contact with the erasing member is provided, and when the written image is erased, the cleaning member removes the erased dust adhering to the erasing member. It is possible to prevent the effect of scratching the written image from being deteriorated due to too much erase dust on the erasing member, and as a result, it is possible to solve the conventional problem that the erasing performance is deteriorated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an internal mechanism of an office electronic blackboard according to a first aspect of the present invention.

FIG. 2 is a partially enlarged perspective view of FIG. 1 showing a contact / separation mechanism of an erasing roller with respect to a writing sheet.

FIG. 3 is a partially enlarged perspective view showing the contacting / separating mechanism in a state where the erasing roller is pressed.

FIG. 4 is a state explanatory view showing an erased state of a written image on a writing sheet.

FIG. 5 is a perspective view showing a state in which a leaf spring for pressing a cleaning roller is removed from a support plate in order to replace the cleaning roller.

FIG. 6 is a partial perspective view of an erasing roller provided with a brush in a spiral shape.

FIG. 7 is a partial perspective view of an erasing roller having brushes provided radially.

FIG. 8 is a perspective view of a conventional electronic blackboard using a roller as an erasing member.

FIG. 9 is a perspective view of a conventional electronic blackboard using an endless belt as an erasing member.

[Explanation of symbols]

 15 writing sheet 25 erasing roller (erasing member) 40 cleaning roller (cleaning member) d erasing residue P writing image

Claims (2)

[Claims] 1. When an image is written on a writing sheet with a writing instrument and then the writing image is erased, an erasing member is pressed against the writing sheet and the writing image thereon is scratched by relative movement with the writing sheet. A writing board to be erased, wherein the erasing member is made of a conductive material and grounded. 2. When an image is written on a writing sheet with a writing instrument and then the writing image is erased, an erasing member is pressed against the writing sheet and the writing image thereon is scratched by relative movement with the writing sheet. An erasing writing board, comprising: a cleaning member that comes into contact with the erasing member and removes erasing dust adhering to the erasing member.