JPH05597A - Electronic blackboard device having image erasing mechanism - Google Patents

Abstract

PURPOSE:To prevent contamination or the deterioration of printing grade and reading capacity due to the powdery scattering of a resin film by constituting the image erasing mechanism of an electronic blackboard device of a blade contact and separation means bringing the edge part of a blade having elasticity to a contact or separated state with respect to the writing surface of a writing body. CONSTITUTION:An electronic blackboard device reads the image written on the surface of a writing medium 40 by the relative motion of the writing medium 40 and an image reading part and releases the release agent-containing resin film forming an image by the relative motion of the writing medium 40 and an image erasing mechanism to erase the image. In this constitution, the image erasing mechanism is constituted of a blade contact and separation means 58 bringing the edge part of a blade 65 having elasticity to a contact and separated state with respect to the writing surface of the writing medium 40. The blade contact and separation means is constituted of a blade revolving means supporting a blade 65 in a freely revolvable manner, energizing means 66, 67 revolving the blade in the direction separating the edge part from the writing medium 40 and a drive means 68 bringing the edge part into contact with the writing medium 40 under pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large writing medium in which an image can be written and erased easily, and an electronic blackboard device provided with a means for recording an image written in the writing medium on a recording paper. ..

[0002]

2. Description of the Related Art Generally, a writing medium used in an electronic blackboard device is a sheet-like material in which a fluorine film or a mylar film is laminated on a milky white base film, and a writing instrument using an aqueous ink, for example, an aqueous felt pen. An image can be written easily by the above. The component of the image at that time is a resin film containing a release agent and a pigment from the writing medium side as shown in FIG. Therefore, the written image can be easily erased with a wiping member such as a soft wool fiber, cloth, felt or sponge.

Therefore, various electronic blackboard devices with an image erasing mechanism have been developed conventionally. For example, Japanese Patent Application Laid-Open No. 61-9071 disclosed by the present applicant is one of them. An erasing mechanism of an electronic blackboard device with an image erasing mechanism disclosed in this publication winds a wiping member around a rotating body that is provided rotatably and in parallel with a surface of a writing medium, and brings the wiping member into contact with the writing medium. While rotating, the writing medium was moved to erase the image.

[0004]

In a conventional electronic blackboard device with an image erasing mechanism, when a rotating brush having hair fibers spirally planted in the image erasing mechanism is used, a resin film forming an image is formed. Shaving off only the thickness of the hair fibers, scattering the scraped resin film as powdered eraser, and
There is a problem that the surroundings of the electronic blackboard device are soiled and an unerased portion remains on the surface of the writing medium.

Further, when cloth, felt, sponge or the like is used as the wiping member, the resin film causes the mesh-like mesh to be clogged to deteriorate the erasing ability, and the resin film remains on the writing medium. The remaining resin film becomes harder as the solvent vaporizes, and when the wiping member passes over it, the resin film is taken from the wiping member side,
There is a problem that the size of the writing medium is accelerated and the writing medium is soiled, and the printing quality is deteriorated when the image is printed by the printing apparatus.

Further, the wiping member cannot completely wipe the release agent, and it adheres thinly to the surface of the writing medium, and in the long-term use, the release agent stains the surface of the writing medium and the white background of the base of the writing medium. May change the color to gray,
There is also a problem that the reading performance of the electronic blackboard is deteriorated.

The present invention prevents the resin film from being erased to stain the hands, clothes, the periphery of the electronic blackboard, etc., and the stains on the writing medium caused by insufficient wiping, the deterioration of printing quality, and the deterioration of reading performance. It is an object of the present invention to provide an electronic blackboard device with an image erasing mechanism.

[0008]

In order to achieve the above object, in an electronic blackboard device with an image erasing mechanism of the present invention,
The image erasing mechanism is provided with a blade contacting / separating means for contacting / separating the edge portion of the elastic blade with the writing surface of the writing medium.

It is also effective to provide a blade cleaning means for removing the peeled release agent-containing resin film from the edge portion of the blade.

Further, it is more effective to provide a dust box for receiving the resin film removed by the blade cleaning agent from the blade, and a dust cover for accommodating the blade cleaning means and the dust box.

[0011]

In the electronic blackboard device with the image erasing mechanism configured as described above, at the time of erasing an image, the edge portion of the elastic blade is pressed against the writing surface of the writing medium so that the writing medium and the blade contacting / separating means are separated from each other. By the relative movement, the resin film containing the release agent that constitutes the image is released. Since the peeled resin film has adhesiveness, it becomes spiral and hangs down at the edge portion of the blade. When the weight of the hanging part becomes larger than the adhesive force, it cuts off and falls into the eraser receiver. At this time, the resin film is not powder but thread-like. Further, the release agent becomes liquid and drops along the edge portion to the eraser powder receiver.

When the blade contacting / separating means erases the entire writing surface, the blade cleaning means removes the resin film adhering to the edge portion of the blade in preparation for the next image erasing. At this time, the dust cover prevents the resin film scattered by the blade cleaning means from scattering around, and the dust box stores the resin film falling in the dust cover.

Therefore, according to the present invention, the resin film becomes a powder and scatters to stain the hands, clothes, the periphery of the electronic blackboard device, stains on the writing medium caused by insufficient wiping, deterioration of print quality, Prevents deterioration of reading performance.

[0014]

Embodiments of the present invention will be described with reference to the drawings. The elements common to the drawings are designated by the same reference numerals.

First Embodiment FIG. 2 is an external perspective view of the first embodiment, and FIG. 3 is a perspective view of FIG.
It is a -3 cross-section arrow line view. An electronic blackboard device with an image erasing mechanism (hereinafter referred to as an electronic blackboard device) is an endless writing medium 40, an image reading unit 42, a frame 43, an edge cover 44, a stand 45, a printer 46, an operating unit 47, and an eraser receiver 48. And a blade contacting / separating unit, a writing medium driving unit, and a control unit described later. The image reading unit 42, the blade contacting / separating unit, and the control unit are provided inside the frame 43. The edging cover 44 provided around the writing screen is formed integrally with the eraser powder receiver 48, and is fixed to the frame 43 with screws 49. The frame 43 is fixed to both arms of the stand 45 with screws 50. The printer 46 is fixed to the frame 43 with screws (not shown).
An operation portion 47 having an erase button 47a is provided on the edging cover 44. The image reading unit 42 reads an image driven in the direction of arrow A by the writing medium driving unit by a photoelectric conversion element arranged in a line in the direction of arrow BB ′ perpendicular to the direction of arrow A. That is, the image reading unit 42 connects the photoelectric conversion element 51a for converting light into an electric signal as shown by the arrow B- in FIG.
It is mounted on the printed circuit board 51 so as to extend in the B'direction, and a self-hook lens is arranged so as to match the photoelectric conversion element 51a. The light from the light source 53 is reflected by the image writing surface of the writing medium 4D, becomes a light flux 54, is guided to the self-hoc lens 52, and the photoelectric conversion element 51 of the printed circuit board 51.
Form an image on a.

FIG. 1 is a schematic diagram showing the essential parts of the writing medium drive section and the blade contacting / separating means when the frame is removed from FIG. 2 and viewed from the back side. The writing medium drive unit 41 includes rollers 55 and 56 that rotatably support shafts 55a and 56a on the frame 43 described above, the writing medium 40, and a drive unit described later provided on the shaft 55a. The blade contacting / separating means 58 is a blade 6 made of an elastic material such as urethane rubber.
5 and blade rotating means 59 equipped with the blade 65
And tension springs 66 and 67 and solenoid 68. The blade 65 has a plate shape substantially equal to the length of the writing screen in the direction of arrow BB '. The blade rotating means 59 includes support plates 60 and 61, a connecting rod 62, a blade mounting plate 64, and rotating shafts 63a and 63b. The support plates 60 and 61 are fixed to both ends thereof so as to sandwich the connecting rod 62 and the blade mounting plate 64, respectively, and the central portions thereof are fixed to the outwardly rotating shafts 63a and 63b, respectively. Rotating shafts 63a, 63
b is rotatably supported on the frame 43. The solenoid 68 is fixed to the frame 43, and the plunger 68a is rotatably attached to the central portion of the connecting rod 62. One ends of the tension springs 66 and 67 are attached to one ends of the support plates 60 and 61, and the other ends are attached to the frame 43. As a result, the blade rotating means 59 rotates in the direction of arrow D, and the blade 65 separates from the writing medium 4D. A pedestal 57 is provided on the back side of the writing medium 40 to prevent the writing medium 40 from bending when the blade 65 is pressed against the writing medium 40.
The surface of the writing medium 40 is coated with an acrylic resin having good smoothness or is a laminate of a fluorine resin film.

FIG. 4 is a block diagram of erase control according to the first embodiment. The erase button 47a is connected to the control circuit 70 by a line 73. The motor drive circuit 71 is connected to the motor 69 that drives the writing medium 40 and the control circuit 70 by lines 74 and 75. The solenoid drive circuit 72 is connected to the solenoid 68 and the control circuit 70 by lines 76 and 77.

FIG. 5 is an erase control time chart of the first embodiment. 9A, 9B and 9C are time charts of the erase button 47a, the solenoid 68 and the motor 69, respectively.

Next, the operation will be described. The image reading operation is not directly related to the present application and will be briefly described. To cause the image reading unit to read the image written on the writing screen, the copy button of the operation unit 47 is pressed. The writing medium drive unit 41 drives the writing medium 40 in the arrow A direction. Image reading unit 4
2 irradiates the writing medium with the light source 53, and the photoelectric conversion element 51a
The reflected light at the image reading position is read by. The read reflected light is converted into image data and printed by the printer 46. Next, the erase operation directly related to the present application will be described with reference to FIG. When the erase button 47a of the operation unit 47 shown in FIG. 2 is pressed at time t ₁ , the control circuit 70 drives the solenoid drive circuit 72 to energize the solenoid 68. The solenoid 68 is the plunger 68a shown in FIG.
Is sucked, the blade contacting / separating means 58 is rotated in the direction of arrow C, and the tip edge portion of the blade 65 is pressed against the writing medium 40. Next, the control circuit 70 drives the motor drive circuit 71 to energize the motor 69. The motor 69 starts rotating at time t ₂ and rotates the roller 55 shown in FIG. 1 to move the writing medium 40 in the direction of arrow A. The image written on the writing medium 40 is peeled off by the edge portion of the blade 65.
At this time, the peeled resin film does not become powdery but becomes helical due to the adhesiveness and hangs down at the tip of the blade 65. Then, when the weight of the hanging portion becomes larger than the adhesive force, it breaks and falls on the eraser powder receiver 48 shown in FIG. The motor 69 stops at time t ₃ . At time t ₄ , the solenoid 68 stops the attraction of the plunger 68a, and the blade contacting / separating means 58 is pulled by the tension springs 66 and 67 to rotate in the direction of arrow D. Therefore, the edge portion of the blade 65 moves away from the writing medium 40.

In this embodiment, the writing medium is moved leftward with respect to the writing surface, but the image reading unit may be provided on the right side and moved rightward. Further, the image reading section and the blade contacting / separating means are separately arranged on the left and right sides of the writing medium, but they may be provided on the same side.

Second Embodiment FIG. 7 is a schematic diagram showing the essential parts of a writing medium drive unit and blade contacting / separating means of the second embodiment. The second embodiment differs from the first embodiment in that the blade is divided into blade pieces 78. The operation is the same as in the first embodiment.

In the second embodiment, the pressure contact force with respect to the writing medium can be made uniform as compared with the first embodiment. Further, when the writing medium is broken or sagging, there is an effect that it is possible to deal with the unevenness of the writing medium.

Third Embodiment FIG. 8 is a schematic diagram showing the essential parts of a writing medium drive unit, a blade contacting / separating means, and a blade cleaning means of the third embodiment. The third embodiment differs from the first embodiment in that a blade cleaning means is added. The blade cleaning means 80 includes a cleaning roller 81 in which a wiping member is radially installed on a shaft 81a which is a main body, and a driving means 8.
It consists of 2. The drive means 82 includes a worm wheel 82, a worm 83, and a cleaning motor 84. Both ends of the shaft 81a of the cleaning roller 81 are rotatably supported by the frame 43 shown in FIG. Also, the shaft 81
A worm wheel 82 is fixed to one end of a.
A worm 83 is fixed to the motor shaft of the cleaning motor 84 fixed to the frame 43 and meshes with the worm wheel 82. The relationship between the blade contacting / separating means 58 and the blade cleaning means 80 is such that when the solenoid 68 is energized, the blade contacting / separating means 58 rotates in the direction of arrow C and the edge of the blade 65 presses against the writing medium 40.
When the energization of the solenoid 68 is stopped, the blade contacting / separating means 58 rotates in the direction of arrow D, and the tip of the blade 65 contacts the cleaning roller 81.

FIG. 9 is an erase control block diagram of the third embodiment. The difference from the erase control block diagram of the first embodiment is that the control circuit 85 is provided in response to the addition of the motor drive circuit 86 and the cleaning motor 84.

FIG. 10 is an erase control time chart of the third embodiment. (A), (b), (c), and (d) of the same figure are time charts of the erase button 47a, the cleaning motor 84, the solenoid 68, and the motor 69, respectively.

Next, the operation will be described. When the operator presses the delete button 47a of the operation unit 47 shown in FIG. 2 at time t ₁ , the control circuit 85 drives the motor drive circuit 86 to rotate the cleaning motor 84 and the cleaning roller 81.
Rotates in the direction of arrow E. At time t ₂ , the solenoid 68 is actuated and the blade contacting / separating means 58 rotates in the direction of arrow C to press the edge of the blade 65 against the writing medium 40. At time t ₃ , the motor 69 is rotated to move the writing medium 4D in the direction of arrow A. After erasing the image of the writing medium 40 by the edge of the blade 65 and erasing the image for a predetermined length, time t ₄
Then, the control circuit 85 stops the motor 69. Then, time t
_{At 5} , the power supply to the solenoid 68 is stopped. The blade contacting / separating means 58 is rotated in the direction of arrow D by the tension springs 66 and 67. The tip of the blade 65 contacts the cleaning roller 81, and wipes off the resin film and the release agent attached to the tip. At time t ₆ , the control circuit 85 stops the rotation of the cleaning motor 84 and ends the erasing operation.

In the erasing operation of the first and second embodiments, since the resin film and the stripping agent attached to the tip of the blade are not wiped, the solvent evaporates after a long time and the resin film is solidified and the erasing effect is obtained. Although it deteriorates, in this embodiment, the erasing effect does not deteriorate because the tip of the blade is wiped without fail during the erasing operation.

Although the plunger of the solenoid and the connecting rod are directly connected to the blade of this embodiment by the contacting / separating means, the link 90 and the tension spring 89 are provided between the plunger 68a and the connecting rod 59 as shown in FIG. And may be provided.
A tension spring 8 is provided between the solenoid 68 and the connecting rod 59.
9 is provided, it is effective in stabilizing the pressure fluctuations of the writing medium 40 and the blade 65 by buffering the fluctuation of the current flowing through the solenoid 68 and the fluctuation of the tensile force which changes due to the heat generation of the solenoid 68.

Fourth Embodiment FIG. 12 is a schematic diagram showing essential parts of a writing medium, a blade contacting / separating means, and a blade cleaning means of a fourth embodiment. This embodiment is different from the third embodiment in that it is a blade cleaning means, and therefore the writing medium drive section and the blade contacting / separating means are greatly simplified and shown. That is, the blade cleaning means 91 includes a cleaning brush 92 in which a wiping member 95 is implanted in the main body 94, and a driving means 93 that reciprocates the cleaning 92 along the edge portion of the blade 65 in the arrow F-G direction. The driving means 93 comprises a motor 96, a roller 97, a pulley 98 and a wire 99.
The motor 96 is fixed to the frame 43 shown in FIG. 3, and a roller 97 is fixed to its motor shaft. In this embodiment, a stepping motor is used as the motor 96. Pulley 9
Reference numeral 8 is rotatably held by a shaft (not shown) provided on the frame 43. Both ends of the wire 99 wound around the roller 97 and the pulley 98 are fixed to the main body 94 of the cleaning brush 92.

The erase control block diagram and time chart of the fourth embodiment are the same as those of the third embodiment. Therefore, the timing of the erase operation is the same. The operation of this embodiment is different from that of the third embodiment in that the cleaning brush 95 removes the resin film or the release agent attached to the tip of the blade 65 from the cleaning brush 95 shown in FIG.
As shown in FIG. 2, the points are removed by moving alternately in the directions of arrows F-G.

In this embodiment, the endless writing medium is provided with the blade contacting / separating means and the blade cleaning means.
FIG. 13A shows a case where the electronic blackboard device of the sheet (writing medium) winding type is provided.

FIG. 13A shows a cross-sectional view of a sheet (writing medium) winding type electronic blackboard device.
Is moved by the winding shaft 101 when it moves in the direction of arrow I, and is wound by the winding shaft 103 when it moves in the direction of arrow H. The rollers 100 and 102 have the role of changing the direction when winding. The light emitted from the light source 53 is reflected at the reading position of the writing medium 40, further turned by the mirror 104, and read by the photoelectric conversion element 51a.

In this embodiment, one set of blade contacting / separating means and blade cleaning means is provided.
As shown in (c), two sets of blade contacting / separating means and blade cleaning means may be provided.

FIG. 13B is a sectional view of a sheet (writing medium) roll-up type electronic blackboard device.
Is moved by the winding shaft 101 when it moves in the direction of arrow I, and is wound by the winding shaft 103 when it moves in the direction of arrow H. The rollers 100 and 102 have the role of changing the direction when winding. The light emitted from the light source 53 is reflected at the reading position of the writing medium 40, further turned by the mirror 104, and read by the photoelectric conversion element 51a.

When the read images are simultaneously erased, the first erasing mechanism 105 moves the writing medium 40 in the direction of arrow I. In addition, the second erasing mechanism 106 is the writing medium 40.
When the image written in is erased without being read by the image reading unit, the writing medium 40 is moved in the arrow H direction.
The figure shows a state in which the first erasing mechanism 105 is operating.

FIG. 3B shows a sectional view of an electronic blackboard device in which the writing medium is an endless type, and the left and right sides are respectively the first section.
The erasing mechanism 105 and the second erasing mechanism 106 are provided.

FIG. 11C is a sectional view of an electronic blackboard device in which the writing medium is a multifaceted endless type, and the first and second erasing mechanisms 105 and 10 are provided on one side as in the case of FIG.
6 is provided.

In either case, when the written image is read by the image reading unit and then erased, the first erasing mechanism erases the image, and when the image is erased without being read by the image reading unit, the second image is displayed simultaneously with the screen feed. Since it is erased by the erasing mechanism of, there is an effect of shortening the waiting time.

Fifth Embodiment FIG. 14 is a schematic diagram showing the essential parts of the fifth embodiment. The difference between this embodiment and the fourth embodiment is that the eraser powder receiving box 11
0 and the dust cover 111 are provided. That is, the erase powder receiving box 110 is arranged directly below the cleaning brush 75, and the blade 65, the cleaning brush 92, and the erase powder receiving box 110 are covered with the dust cover 111. The eraser powder box 110 passes through the lower portion of the writing medium 40 in the direction of arrow J,
That is, it can be pulled out to the image writing side.

The operation of this embodiment is different from that of the fourth embodiment in that when the cleaning brush 92 removes the resin film and the release agent attached to the tip of the blade 65, the eraser powder receiving box 110 provided immediately below. It falls and is stored. At this time, even if they are scattered around, they fall into the dust cover 111.

Therefore, this embodiment is different from the fourth embodiment in that
Since the erase powder is accumulated in the erase powder receiving box, there is an effect that it is not scattered inside the electronic blackboard device and the optical system is not polluted.

Sixth Embodiment FIG. 15 is an external perspective view of the sixth embodiment. Although the writing medium is moved with respect to the image reading unit in the first to fifth embodiments, this embodiment is an electronic blackboard device with a scanner moving type erasing mechanism in which the image reading unit is moved with respect to the writing medium.
As can be seen from the figure, the scanner unit 1 that holds two sides of the writing medium 40 in the arrow R-S direction and moves in the arrow PQ direction.
First except for 19 and blade cleaning means 120
It is the same as FIG. 2 shown in the embodiment. Where arrow R-S
The direction is orthogonal to the arrow PQ direction.

FIG. 16 is a sectional view taken along line 16-16 of FIG. 15, and is a sectional view taken from the upper end of the scanner section 119 by the thickness of the frame 130. Further, FIG. 17 shows M- of FIG.
FIG. The inside of the frame 130 is composed of three partitioned rooms, and the image reading section 42 is provided in the central and right portions. A light source 53 is provided in the center room, and a cell hook lens 52 and a printed circuit board 51 on which a photoelectric conversion element 51a is mounted are provided in the right room.
A blade contacting / separating means 121 is provided in the left room.
The blade contacting / separating means 121 includes a blade 122, a blade mounting plate 123, a link 125, a solenoid 128, and a tension spring 129. The blade 122 is made of an elastic material such as urethane rubber and has a length substantially equal to the length of the image writing surface in the direction of arrow RS. The blade mounting plate 123 has a U shape with both ends bent to face each other. The blades 122 are fixed to the main body and the shafts 124, 1 provided on the side surfaces of the frame 130 facing each other in the direction of arrow RS.
The ear portion is rotatably supported by 31. The link 125 includes one ear of the blade mounting plate 123 and the solenoid 128.
Is connected to the plunger 128a of the above by pins 126 and 127. Further, the tension spring 129 is the blade mounting plate 1
The other ear of 23 and the partition wall 130a of the frame 130 are hooked. Further, the solenoid 128 is the partition wall 13.
It is fixed to 0a with a screw 132.

The relationship between the solenoid 128 and the blade 122 is such that when the solenoid 128 is energized, the plunger 128a
Is sucked to rotate the blade mounting plate 123 in the direction of arrow T, and the blade 122 is pressed against the writing medium 40. When the power supply to the solenoid 128 is stopped, the tension spring 12
The pulling force of 9 causes the blade mounting plate 123 to rotate in the direction of arrow U to separate the blade 122 from the writing medium 40.

FIG. 18 is a detailed view of the blade cleaning means. The blade cleaning means 120 absorbs the release agent adhering to the edge portion of the blade 122.
33 is fixed to the writing medium 40 with a pressing plate 134. The holding plate 134 is fixed to the writing medium 40 with screws 135.

FIG. 19 is a plan view showing the home sensor mounting position. The home sensor 140 is a sensor that outputs an image reading start signal and uses a limit switch or the like. When the scanner unit 119 is at the home position, the home sensor 140 outputs the “off” signal.

FIG. 20 is a plan view showing the relationship between the scanner section and the blade cleaning means. When the blade 122 is pressed against the writing medium 40 and the scanner unit 119 is moved in the direction of arrow Q, the edge portion 122a of the blade 122 separates the image. The resin film becomes a helix in the middle and falls onto the eraser powder receiver 48, but the liquid release agent adheres to the edge portion 122a of the blade 122 as shown in FIG. Is transported to and absorbed by the absorbent material.

FIG. 22 is an erase control block diagram of the sixth embodiment. The motor 138 is a drive unit that moves the scanner unit 119 in the arrow PQ direction as shown in FIG.
The lines 140 and 141 are connected to the control circuit 136 via the motor drive circuit 137. The solenoid 128 is connected to the control circuit 136 via lines 142 and 143 via a solenoid drive circuit 139. The erase button 47a is connected to the control circuit 136 by a line 73. Home sensor 140 is connected to control circuit 136 via line 145.

FIG. 23 is an erase control time chart of the sixth embodiment. FIGS. 23A, 23B, 23C and 23D show the erase button 47a, the motor 138 and the home sensor 14, respectively.
0 is a time chart of the solenoid 128.

Next, the operation will be described with reference to FIG. At time t ₁ , the delete button 4 of the operation unit 47 shown in FIG.
When 7a is pressed, solenoid 128, motor 138
Is energized, the edge portion 122a of the blade 122 is pressed against the writing medium 40, and the motor 138 rotates to move the scanner portion 119 in the arrow Q direction. At time t ₂ , home sensor 140 turns “on”. As the scanner unit 119 is driven in the direction of the arrow Q, the edge portion 122a of the blade 122 peels off the resin film containing the release agent that forms the image written on the writing medium 40. The resin film becomes a spiral and drops onto the eraser powder receiver 48, and the release agent becomes a liquid and adheres to the edge portion 122 a of the blade 122 and is conveyed to the blade cleaning means 121. At time t ₃ , the control circuit 136 stops the rotation of the motor 138. At this time,
Since the edge portion 122a of the blade 122 is in contact with the absorbent material 133, the absorbent material 133 absorbs the liquid release agent. At time t ₄ , the control circuit 136 stops energizing the solenoid 128 to separate the edge portion 122 a of the blade 122 from the writing medium 40. Further, the motor 138 is reversely rotated to drive the scanner unit 119 at high speed in the arrow direction. At time t ₅ , home sensor 140 is turned off. Control circuit 136
Reduces the rotation of the motor 138. At time t ₆ , the control circuit 136 stops the rotation of the motor 138. As a result, the scanner unit 119 stops at the home position.

In this embodiment, since the blade cleaning means moves together with the scanner section, the image reading operation and the erasing operation can be performed simultaneously, and the waiting time can be shortened.

In this embodiment, one set of the blade contacting / separating means is provided in the scanner section, but two sets of the blade contacting / separating means may be provided in the scanner section, and the blade cleaning means may be provided respectively on the left and right sides of the writing screen. In this case, it is not necessary to return the scanner unit to the home position for each erase operation, and the waiting time can be further shortened.

Seventh Embodiment FIG. 24 is an external view of the seventh embodiment, and FIG. 25 is a sectional view taken along the line 24-24 of FIG. FIG. 26 is a sectional view showing the structure of the blade cleaning means. The blade cleaning means is largely different from the sixth embodiment in the seventh embodiment. The blade cleaning means 152 implants a wiping member 153b on the shaft 153a, and the wiping member 1
The cleaning roller 153, the cleaning motor 154, the powder removing member 155, and the erase powder receiving box 156 have the entire length of 53b equal to the length of the writing medium 40 in the arrow R-S direction.
And a frame 157. The blade cleaning means 152 is provided adjacent to the writing medium 40, and the wiping member of the cleaning roller 153 is arranged so as to overlap with the extension of the writing medium 40. As shown in FIG. 26, one end of the cleaning roller 153 has a partition wall 57 of the frame 157.
The shaft of the cleaning motor 154 fixed to a is shaft-jointed, and the other end is a bearing 159 provided on the bracket 158.
It is rotatably supported by. The bracket 158 is fixed to the frame 157 with screws 160. The frame 157 is provided with a blade receiving port 157b. When the scanner unit 150 is positioned at the home position, the tip of the blade 122 contacts the wiping member 153b of the cleaning roller 153 as shown in FIG.

FIG. 27 is a read-erase control block diagram of the seventh embodiment. The read-erase button 47b is the control circuit 162.
Is connected by a line 164. The motor 138 that drives the scanner unit 150 is connected to the control circuit 162 through lines 141 and 142 via the motor drive circuit 137.
The cleaning motor 154 is connected to the control circuit 162 via the motor drive circuit 163 by lines 165 and 166. The solenoid 128 is connected to the control circuit 162 via the solenoid drive circuit 139 by lines 143 and 144. The home sensor 140 is connected to the control circuit 162 by a line 145.

FIG. 28 is a read-erase control time chart of the seventh embodiment. (A), (b), (c),
(D) and (e) are time charts of the read / erase button 47b, the motor 138, the home sensor 140, the solenoid 128, and the cleaning motor 154, respectively.

Next, the operation will be described. At time t ₁ the reading of the operation unit 47 shown in FIG. 24 - the erase button 47b is pressed, the control circuit 162 rotates the motor 138 to drive the scanner unit 150 to the forward direction. Scanner unit 150
Starts moving in the direction of arrow Q. At time t ₂ , the home sensor 140 is turned on, and the control circuit 162 causes the image reading unit 42 to read the image written on the writing medium 40.
When the control section 162 moves the scanner section 150 by a predetermined distance, it stops the motor 138 at time t ₃ and energizes the solenoid 128 to press the edge portion of the blade 122 against the writing medium 40. At time t ₄ , the control circuit 162 rotates the motor 138 in the reverse direction to return the scanner unit 150 in the arrow P direction. The edge portion of the blade 122 peels off the resin film containing the release agent that constitutes the image. The resin film has a spiral shape and hangs down, and eventually the weight of the eraser powder receiver 4
Fall to 8. The liquid release agent adheres to the edge portion of the blade 122. At time t ₅ , the scanner unit 150 turns off the home sensor 140. The control circuit 162 decelerates the rotation of the motor 138 and stops it at time t ₆ . At this time, the tip portion of the blade 122 is the cleaning roller 1
The wiping member 153b of 53 is in contact. Also, at time t ₆
Then, the control circuit 162 causes the cleaning motor 154 to operate as shown in FIG.
Rotate in the direction of the arrow as shown in. The resin film and the release agent attached to the tip of the blade 122 are removed by the wiping member 153.
b, it falls into the eraser powder receiving box 156.

In this embodiment, since the resin film and the stripping agent attached to the blade are forcibly removed by the blade cleaning means, the erasing ability is improved as compared with the sixth embodiment.

[0058]

Since the present invention is constructed as described above, it has the following effects.

Since the edge portion of the elastic blade is brought into contact with and separated from the writing surface of the writing medium, the resin film containing the pigment and the like is not pulverized but becomes a thread and falls on the eraser receiver. Therefore, do not stain your hands, clothes, or the area around the electronic blackboard.

Further, since the blade peels off the resin film over the entire width of the writing screen, the unerased residue is completely eliminated, and a white writing screen can be obtained at any time.

Further, the peeling agent existing between the resin film and the writing medium becomes liquid when peeled off, and the peeling agent is completely removed by dropping along the edge portion. It does not change to gray and the image reading performance does not deteriorate.

Further, by providing the blade cleaning means to remove the resin film adhering to the edge portion of the blade at the end of the erasing operation, it is possible to always erase with the sharp edge portion.

Also, by adding a dust cover and a dust box to the blade cleaning means, the wiped resin film does not scatter and the surroundings of the electronic blackboard device are not polluted.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a main part of a first embodiment.

FIG. 2 is an external perspective view of the first embodiment.

3 is a sectional view taken along the line 3-3 of FIG.

FIG. 4 is an erase control block diagram of the first embodiment.

FIG. 5 is an erase control time chart of the first embodiment.

FIG. 6 is a sectional view showing the structure of an image.

FIG. 7 is a schematic diagram showing a main part of the second embodiment.

FIG. 8 is a schematic diagram showing a main part of a third embodiment.

FIG. 9 is a block diagram of erase control according to the third embodiment.

FIG. 10 is an erase control time chart of the third embodiment.

FIG. 11 is a schematic diagram showing a modification of the third embodiment.

FIG. 12 is a schematic diagram showing a main part of a fourth embodiment.

FIG. 13 is a sectional view showing a modification of the fourth embodiment.

FIG. 14 is a schematic diagram showing a main part of a fifth embodiment.

FIG. 15 is an external perspective view of a sixth embodiment.

16 is a sectional view taken along the line 16-16 of FIG.

17 is a sectional view taken along the line 17-17 of FIG.

FIG. 18 is a detailed view of blade cleaning means.

FIG. 19 is a plan view showing a home sensor mounting position.

FIG. 20 is a plan view showing a scanner unit and blade cleaning means.

FIG. 21 is an explanatory diagram showing a peeled state.

FIG. 22 is a block diagram of an erase control circuit according to the sixth embodiment.

FIG. 23 is an erase control time chart of the sixth embodiment.

FIG. 24 is an external view of a seventh embodiment.

25 is a sectional view taken along the line 24-24 of FIG.

FIG. 26 is a cross-sectional view showing the configuration of blade cleaning means.

FIG. 27 is a read-erase control block diagram of the seventh embodiment.

FIG. 28 is a read-erase control time chart of the seventh embodiment.

[Explanation of symbols]

40 writing medium 41 writing medium driving unit 42 image reading unit 58, 121, 151 blade contacting / separating unit 65, 122 blade 78 blade piece 80, 91, 120, 152 blade cleaning unit 81, 152 cleaning roller 82, 93 driving unit 92 cleaning Brush 105 First erasing mechanism 106 Second erasing mechanism 110 Erasing powder receiving box 111 Dust cover 119, 150 Scanner unit

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hitoshi Tomiyama 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (72) Inventor Osamu Ishikawa 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (72) Inventor Yuji Machida 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd.

Claims (1)

Claims: 1. An image written on the surface of a writing medium is read by the relative movement of the writing medium and the image reading unit, and the image is formed by the relative movement of the writing medium and the image erasing mechanism. In an electronic blackboard device with an image erasing mechanism for peeling and erasing a resin film containing a release agent, the image erasing mechanism is a blade contacting / separating means for contacting / separating an edge portion of an elastic blade with a writing surface of a writing medium. An electronic blackboard device with an image erasing mechanism. 2. The electronic blackboard device with an image erasing mechanism according to claim 1, further comprising blade cleaning means for wiping and removing the peeled resin film from the edge portion of the blade. 3. The electronic blackboard device with an image erasing mechanism according to claim 1, further comprising blade cleaning means for absorbing and removing the peeled release agent from the edge portion of the blade. 4. The electronic blackboard device with an image erasing mechanism according to claim 1, wherein the blade contacting / separating means is fixed and the writing medium is moved. 5. An electronic blackboard device with an image erasing mechanism according to claim 1, 2 or 3, wherein the blade contacting / separating means is moved to fix the writing medium. 6. The electronic blackboard device with an image erasing mechanism according to claim 5, wherein the scanner unit provided with the image reading unit is equipped with a blade contacting / separating unit. 7. The blade contacting / separating means has a blade having an edge portion extending in a direction intersecting the relative motion, a blade rotating means for mounting the blade and pivotally supporting the blade, and an edge portion for writing medium. Urging means for rotating in a direction away from,
7. An electronic blackboard device with an image erasing mechanism according to claim 4, 5 or 6, further comprising a driving means for pressing the edge portion against the writing medium against the urging force of the urging means. 8. The electronic blackboard device with an image erasing mechanism according to claim 7, wherein the blade has a length such that the edge portion is in contact with the entire length of the writing screen in a direction perpendicular to the relative movement direction. 9. The electronic blackboard device with an image erasing mechanism according to claim 7, wherein the blade has a length such that the blade piece is joined to contact the entire length of the writing screen in a direction perpendicular to the relative movement direction. 10. The blade cleaning means comprises a cleaning roller in which a wiping member is embedded in a main body having a length equal to the entire length of the edge portion of the blade to rotatably support the cleaning roller, and a driving means for rotating the cleaning roller. An electronic blackboard device with an image erasing mechanism according to claim 8 or 9. 11. The blade cleaning means comprises a cleaning brush having a wiping member implanted in the main body, and a driving means for reciprocating the cleaning brush along the entire length of the edge portion of the blade. Electronic blackboard device with image erasing mechanism. 12. The image erasing mechanism according to claim 10, wherein the blade cleaning means is provided with a dust box for storing the erase powder wiped off from the blade, and a dust cover for storing the blade cleaning means and the dust box. Electronic blackboard device.