JP3575067B2 - Writing board - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an improvement in a writing board.
[0002]
[Prior art]
As a large-sized writing board, a chalkboard using chalk has been conventionally provided. However, it has been pointed out that a chalk powder scatters during writing or erasing, thereby contaminating the surroundings. Therefore, a so-called white board has been developed in which writing is performed on a resin-coated substrate with a felt pen or the like.
[0003]
[Problems to be solved by the invention]
However, with a conventional whiteboard, if you want to erase all the characters and the like written on the board surface with a felt pen at once, you have to erase the whole area of the board surface with an eraser (blackboard eraser). However, there was a problem that it was troublesome. In addition, if the substrate is used for a long period of time, the surface of the substrate is deteriorated, and fine cracks are generated in the resin coating layer, and the ink may penetrate into the resin coating layer, making it impossible to completely erase characters.
[0004]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a writing board that does not require time and effort to erase characters and that can also prevent deterioration in quality over time.
[0005]
[Means for Solving the Problems]
A writing board according to the present invention accommodates a reel having a substrate, a band, a synthetic resin film provided so as to cover the surface of the substrate and having an upper shaft and a lower shaft at both ends. A film holding portion provided with a casing and bearings for supporting an upper shaft and a lower shaft of the reel above and below the casing; and a winding device provided on a side opposite to the film holding portion for winding the synthetic resin film. comprising: a reel, and the film holding portion of the brake shoe to provide rotational resistance to the reel, and a rotation transmission mechanism for rotating the take-up reel has a reverse rotation blocking function in the winding direction of the synthetic resin film, wherein the brake shoe Is provided between the inside of the upper surface of the casing and the upper part of the reel, and is provided on a bearing on the lower side of the casing, and is provided in the axial direction. While the possible bearing metal is always urged upward by the coil spring, when the reel is mounted, the bearing metal is pushed down by receiving the lower shaft of the reel, and the coil spring is pressed. Is compressed, the bearing metal is urged upward by the restoring force of the coil spring, the upper shaft of the reel is inserted into the upper bearing, and the reel is supported in a state of being urged upward. The invention is characterized in that the brake shoe is pressed into contact with the reel to provide rotational resistance (the invention of claim 1).
[0006]
Further, a substrate formed of a porous plate having air permeability , a reel having a belt-shaped synthetic resin film provided so as to cover the surface of the substrate and having an upper shaft and a lower shaft at both ends, A film holding portion provided with a casing for accommodating the reel, and bearings supporting upper and lower shafts of the reel above and below the casing; and the synthetic resin film provided on a side opposite to the film holding portion. A take-up reel, a brake shoe that applies rotational resistance to the reel of the film holding unit, a rotation transmission mechanism that has a reverse rotation preventing function and rotates the take-up reel in the take-up direction of the synthetic resin film, A suction chamber provided on the surface of the substrate opposite to the surface to which the film is addressed, and connected to the suction chamber to cover the surface of the substrate. And a suction device for attracting the substrate surface said film has cracks, the brake shoes, with provided between the upper portion of the upper surface portion inside said reel of said casing, on the lower side of the bearing of the casing While the bearing metal provided and movable in the axial direction is always urged upward by the coil spring, when the reel is mounted, the bearing metal receives the lower shaft of the reel. While being depressed, the coil spring is compressed, the bearing metal is urged upward by the restoring force of the coil spring, the upper shaft of the reel is inserted into the upper bearing, and the reel is urged upward. said brake shoe by being supported in a state having a characterized in that the rotational resistance is applied to pressed against the reel ( Motomeko 2 of the invention).
[0007]
[Action]
According to the writing board of the present invention, writing is performed on the surface of the synthetic resin film with a writing instrument. At the time of writing, the synthetic resin film is supported from behind by the substrate, so that even if the synthetic resin film is flexible, it does not hinder writing. If you want to erase the whole area after writing with a felt-tip pen or the like, pull out a new synthetic resin film and set it to cover the surface of the board. Return to On the other hand, when attempting to partially erase these characters, for example, the erased portion may be rubbed with an eraser.
Further, in the writing board of the present invention, the bearing metal provided on the bearing on the lower side of the casing and movable in the axial direction is always urged upward by a coil spring. When the reel is mounted, the bearing metal is pushed down by receiving the lower shaft of the reel, and the coil spring is compressed. The bearing metal is urged upward by the restoring force of the coil spring, and the upper shaft of the reel is rotated. Is inserted into the upper bearing, and the reel is supported in a state of being urged upward, so that the brake shoe provided between the inside of the upper surface portion of the casing and the upper portion of the reel is pressed. As a result, the reel of the film holding section is supported by bearings provided above and below the casing, while the reel is given rotational resistance, and the synthetic resin film is always wound in a tight state. In addition, since there is a rotation transmission mechanism that has a reverse rotation prevention function and rotates the take-up reel in the winding direction of the synthetic resin film, the take-up reel does not reverse and the synthetic resin film is always kept after winding. Keep it taut.
[0008]
According to the writing board of the second aspect, when air is sucked from the suction chamber by the operation of the suction device, the synthetic resin film is fixed to the substrate by suction because the substrate is formed of the porous plate. .
[0009]
【The invention's effect】
As described above, according to the writing board of the present invention, in order to erase the whole written characters and the like, a new synthetic resin film may be drawn and addressed to the substrate. Is simple and a new synthetic resin film is always provided for writing, so that good writing quality is always maintained. In addition, since a brake shoe is provided and a rotation transmitting mechanism having a reverse rotation preventing function is provided, the synthetic resin film is always wound tightly while the synthetic resin film is sequentially wound. It is possible to prevent the synthetic resin film from wrinkling during writing and becoming difficult to write.
Furthermore, in the writing board of claim 2, since the synthetic resin film is securely fixed to the substrate, even when a thin and flexible synthetic resin film is used, the synthetic resin film does not wrinkle during writing, and The effect that it becomes easy to obtain is obtained.
[0010]
【Example】
<First embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. The overall configuration is as shown in FIG. 1. The substrate 11 is formed in a flat box shape with a back surface opened by, for example, a wooden plate, and is supported on the floor surface by a pair of legs 12 provided on the bottom surface. It has a white, smooth coating on the front. A film holding section 20 is provided on the left side edge of the substrate 11, and a film winding section 40 is provided on the right side edge, and a strip-shaped resin film 60 pulled out from the film holding section 20 faces the front side of the substrate 11. Addressed to cover. The resin film 60 is made of a transparent synthetic resin such as polyvinyl chloride or polyvinylidene chloride, so that the white front surface of the substrate 11 can be seen through. In addition, the right end side of the resin film 60 is introduced into the film winding section 40, and the upper and lower edges of the resin film 60 on the front surface of the substrate 11 are formed by decorative frames 13 provided on the upper and lower edges of the front surface of the substrate 11. Covered.
[0011]
As shown in FIGS. 2 and 3, the film holder 20 houses a reel 22 around which the resin film 60 is wound in a vertically long casing 21, and hinges are provided on the open front and side surfaces of the casing 21. A cover 23 is attached via an opening 21a so as to be openable and closable. As shown in FIG. 3, a bearing 25 for receiving the upper shaft 24 of the reel 22 is provided on the upper surface of the casing 21, and a thrust bearing 27 for receiving the lower shaft 26 of the reel 22 is provided on the bottom surface. ing. The thrust bearing 27 has a configuration in which a cylindrical bearing metal 29 is vertically movably inserted into a cylindrical shaft holder 28, and the bearing metal 29 is constantly urged upward by a coil spring 30. The lower shaft 26 of the reel 22 is received by a mortar-shaped bearing hole 31 formed in the surface portion. When the reel 22 is rotatably supported by the upper and lower bearings 25 and 27 as shown in FIG. 3, the upper end plate 22a of the reel 22 is pressed against the annular brake shoe 32 provided inside the upper surface of the casing 21. This provides resistance to the rotation of the reel 22 to prevent the resin film 60 from loosening. The lower end surface of the lower shaft 26 of the reel 22 is formed into a spherical shape. When the reel 22 is mounted, the lower shaft 26 of the reel 22 is pressed down by pressing down the bearing metal 29 while compressing the coil spring 30. 29.
[0012]
On the other hand, the film take-up section 40 is as shown in FIGS. 2 and 4, and a take-up reel 42 for winding the leading end side of the resin film 60 is housed in a vertically long casing 41. The open front and side surfaces can be opened and closed by a cover 43. A thrust bearing 45 for receiving the lower shaft 44 of the take-up reel 42 is provided on the bottom surface of the casing 41. The thrust bearing 45 is the same as that of the film holding unit 20, and is inserted into a cylindrical shaft holder 46. The cylindrical bearing metal 47 is always urged upward by a coil spring 48, and the lower shaft 44 of the take-up reel 42 is received by a mortar-shaped bearing hole 49 formed in the upper end surface of the bearing metal 47. Have been.
[0013]
A rotary shaft 51 is rotatably supported on the upper surface of the casing 41 via a bearing 50 so as not to be able to move up and down, and a worm wheel 52 is fixed to an upper portion of the rotary shaft 51 and a shaft joint 53 is fixed to a lower portion. ing. A shaft joint 55 attached to the upper shaft 54 of the take-up reel 42 is engaged with the shaft joint 53. When the take-up reel 42 shown in FIG. The two shaft joints 55 and 53 are meshed and engaged with each other by the pushing-up force from the shaft, so that the take-up reel 42 rotates integrally with the worm wheel 52.
[0014]
A winding motor 56 is disposed above the casing 41. As shown in FIG. 5, a worm gear 57 provided on a drive shaft 56a meshes with the worm wheel 52. The resin film 60 can be wound on the take-up reel 42 by rotating the take-up reel 42 by the rotation of. The take-up motor 56 is driven to rotate the take-up reel 42 only while the operation switch 58 provided at the lower part of the front surface of the substrate 11 is turned on.
[0015]
Subsequently, a method of using the writing board of the present embodiment will be described. First, the cover 23 of the film holder 20 is opened, the reel 22 around which the resin film 60 is wound is mounted on the bearings 25 and 27, and the tip of the resin film 60 is pulled out. Then, with the upper and lower side edges of the resin film 60 inserted into the decorative frame 13 of the substrate 11, the resin film 60 is pulled out so as to cover the entire area of the substrate 11. Then, the cover 43 on the film take-up unit 40 side is opened, and the leading end of the resin film 60 is wound around the take-up reel 42, and the covers 23 and 43 are closed. When the operation switch 58 is turned on in this state, the take-up motor 56 is driven to rotate the take-up reel 42, and the resin film 60 is moved from the film holding section 20 to the film take-up section 40 to take up the film. Can be At this time, since the rotation resistance is applied to the reel 22 of the film holding unit 20 by the brake shoe 32, the resin film 60 is always wound in a taut state. Further, the take-up motor 56 and the take-up reel 42 are configured to transmit rotation by a combination of the worm wheel 52 and the worm gear 57, and no rotational force is transmitted from the take-up reel 42 side to the motor 56 side. The motor 56 does not reversely rotate after the power failure of the motor 56, and the resin film 60 always maintains a taut state even after winding.
[0016]
Thus, by writing on the resin film 60 with a writing instrument 70 (see FIG. 1) such as a felt pen using water-based ink, desired characters and the like can be drawn on the resin film 60. In order to partially erase these characters and the like, the erased portion may be rubbed with a felt-made eraser 71 provided at an end of the writing instrument 70, for example. Further, in order to erase the entirety, the operation switch 58 is turned on to wind the resin film 60 until the portion on which the characters and the like are written is wound inside the film winding section 40. As a result, the new resin film 60 is pulled out from the reel 22 of the film holding unit 20 and covers the front surface of the substrate 11, so that the previously written portion is erased and becomes a blank sheet, and the conventional white board or the like is removed. It is not necessary to erase the characters and the like by rubbing the whole area with an eraser as described above.
[0017]
When all of the resin film 60 wound around the reel 22 is pulled out, the reel 22 and the take-up reel 42 are removed, and the reel 22 around which the unused resin film 60 is wound and the empty take-up reel By reattaching 42, it can be used like a new one, and even if it is used for a long period of time, there is no deterioration in quality due to aging of the substrate 11 or the like, and the exchange of the resin film 60 is very easy. .
[0018]
Further, in particular, in the present embodiment, a combination of a worm wheel 52 and a worm gear 57 having a reverse rotation preventing function as a rotation transmitting mechanism to the take-up reel 42 is provided while the brake shoe 32 for imparting rotational resistance to the reel 22 is provided. Therefore, the resin film 60 can be kept in a taut state while the resin film 60 is sequentially wound up, and the resin film 60 becomes wrinkled when writing with the writing instrument 70. It is possible to prevent the writing from becoming difficult.
[0019]
<Second embodiment>
FIG. 6 shows a second embodiment of the present invention. The first embodiment differs from the first embodiment in that a porous plate 81 is disposed on the front surface of the substrate 80, and an intake chamber 82 is provided on the rear surface of the substrate 80, and an intake device 84 is connected to the intake chamber 82 via a pressure-resistant tube 83. The difference is that the other structure is the same as that of the first embodiment, and the same parts are denoted by the same reference numerals, and redundant description will be omitted.
[0020]
The porous plate 81 is formed by filling a molding die with thermoplastic resin powder such as polypropylene, for example, and heating the same to form a sintered state. The porous plate 81 has countless continuous pores therein and has air permeability. However, the surface is so smooth that it does not interfere with writing. Further, the intake chamber 82 is configured by attaching a shielding plate 86 to the back side of the porous plate 81 via a spacer 85 in an airtight state, and a nipple 87 is attached through the shielding plate 86. A pressure-resistant tube 83 is connected to the nipple 87, and the distal end of the pressure-resistant tube 83 is connected to an intake device 84 constituted by a vacuum pump.
[0021]
According to the configuration of this embodiment, since the inside of the suction chamber 82 is depressurized by operating the suction device 84, the resin film 60 addressed to the porous plate 81 is adsorbed by the porous plate 81, The film 60 is firmly fixed on the porous plate 81. Thereby, even if the film thickness of the resin film 60 is thin and flexible, the resin film 60 can be reliably prevented from shifting during writing, and the same excellent writing taste as in the case of directly writing on a hard plate can be obtained. can get.
[0022]
When the operation switch 58 is turned on to wind the resin film 60, the operation of the suction device 84 is stopped, so that the attraction force of the resin film 60 to the porous plate 81 is lost. The winding of the resin film 60 can be performed without any problem.
[0023]
<Third embodiment>
FIG. 7 shows a third embodiment in which the present invention is applied to a simple writing board.
[0024]
The substrate 91 is made of, for example, white plastic, has a flat box shape of, for example, A4 size, and has a smooth surface. A film holding portion 93 that can be opened entirely by a cover 92 is provided on an upper portion of the substrate 91, and a resin film 95 wound around a paper cylinder 94 is accommodated in the film holding portion 93. As the resin film 95, a commercially available food wrapping film for home use is used as it is. For example, polyvinylidene chloride is a main component and has a self-adhesive property. I do.
[0025]
In the state where the cover 92 is closed as shown by a solid line in the figure, a slight gap is formed between the front end of the cover 92 and the surface of the substrate 91, and the resin film 95 can be pulled out downward therefrom. The leading end side of the drawn resin film 95 extends to the lower part of the substrate 91 and covers the entire surface of the substrate 91. A film cutter 96 is fixed to the lower end of the substrate 91, and can be cut by pressing the resin film 95 against the film cutter 96.
[0026]
In use, a character or the like is drawn on the resin film 95 by a writing instrument (not shown). At this time, the resin film 95 is in close contact with the substrate 91 by self-adhesive force, so there is no fear of shifting. To erase characters and the like, the lower end of the resin film 95 is picked up from both left and right sides, lifted up, separated from the substrate 91 and pulled down. Then, since the resin film 95 is pulled out from the film holding portion 93, the resin film 95 is dropped on the substrate 91 when the length is appropriately pulled out, and is brought into close contact with the substrate 91. If pressed, unnecessary portions will be cut. In order to facilitate the peeling of the resin film 95 from the substrate 91, a concave portion for inserting a finger may be formed on both left and right sides of the substrate 91.
[0027]
With this configuration, the overall configuration is extremely simple and can be manufactured at low cost, and the effect that a resin film that can be easily obtained can be used and maintenance can be simplified can be obtained.
[0028]
<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and the drawings. For example, the following embodiments are also included in the technical scope of the present invention.
[0030]
(2) In the first and second embodiments, a linear light source such as an LED array and a one-dimensional image sensor are provided on the film winding portion side so as to sandwich the entire width of the resin film 60, and the resin film 60 is transmitted through the film. Characters and the like drawn on the resin film are optically read by the amount of light and converted into electric signals. Based on this, image processing is performed by a computer, and the image signals are transmitted to a remote place via a communication line. Or display on a display or printing on recording paper.
[0031]
(3) In the second embodiment, when the resin film 60 is wound up, the discharge side of the suction device 84 is connected to the suction chamber 82 by switching the valve so that air is blown from the porous plate 81 toward the front surface. You may do so. By doing so, the resin film 60 immediately rises from the porous plate 81, so that the winding operation of the resin film 60 can be performed smoothly.
[0032]
(4) In each of the first to third embodiments, the substrate may be formed of, for example, a milky white translucent plastic plate, and a backlight light source may be arranged on the back side to shine light from the back side of the resin film. According to this, there is obtained an advantage that it can be clearly recognized even in a place where the amount of light from the front is insufficient.
[0033]
Others, as may be using the resin fill-time, for example, a hard film, from the size of the board or those of large size of the so-called blackboard-shaped, those of the bulletin board and vertical signs shaped medium-size, or small portable Can be set to a desired size, and the drawing direction of the resin film can be arbitrarily set in either the vertical direction or the horizontal direction.
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing a first embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of the embodiment. FIG. 3 is a longitudinal sectional view showing a film holding portion of the embodiment. FIG. 5 is a longitudinal sectional view showing a film winding section of the embodiment. FIG. 5 is a plan view showing a film winding section of the embodiment. FIG. 6 is an enlarged transverse sectional view showing a second embodiment of the present invention. Partially cutaway perspective view showing a third embodiment of the invention.
11, 80, 91 ... substrate 20 ... film holder 22 ... reel 32 ... brake shoe 52 ... worm wheel 57 ... worm gear 58 ... operation switches 60, 95 ... resin film 70 ... writing implement 81 ... porous plate 82 ... intake chamber 84 ... Intake device

Claims (2)

A substrate, a reel wound around a synthetic resin film provided so as to cover the surface of the substrate in a belt shape and having an upper shaft and a lower shaft at both ends, and a casing accommodating the reel; A film holding portion provided with bearings for supporting an upper shaft and a lower shaft of the reel, a winding reel provided on the opposite side to the film holding portion to wind the synthetic resin film, and a film holding portion. A brake shoe that applies rotation resistance to the reel, and a rotation transmission mechanism that has a reverse rotation prevention function and rotates the take-up reel in a direction in which the synthetic resin film is taken up,
The brake shoe is provided between the inside of the upper surface of the casing and the upper part of the reel, and a bearing metal provided on a lower bearing of the casing and movable in the axial direction is always attached to the upper side by a coil spring. On the other hand, when the reel is mounted, the bearing metal is pushed down by receiving the lower shaft of the reel to compress the coil spring, and the bearing metal is The upper shaft of the reel is urged upward by the restoring force of a spring, and the upper shaft of the reel is inserted into the upper bearing, and the reel is supported in a state of being urged upward, so that the brake shoe is pressed against the reel. A writing board to which rotational resistance is given . A substrate formed of a porous plate having air permeability , a reel formed by winding a synthetic resin film provided so as to cover the surface of the substrate in a band shape, and having an upper shaft and a lower shaft at both ends; A film holding portion provided with bearings for supporting the upper shaft and the lower shaft of the reel above and below the casing, and provided on the opposite side to the film holding portion and winding the synthetic resin film. A take-up reel, a brake shoe for providing rotation resistance to the reel of the film holding unit, a rotation transmitting mechanism having a reverse rotation preventing function and rotating the take-up reel in a direction in which the synthetic resin film is wound, and the substrate A suction chamber provided on a surface opposite to a surface to which the film is addressed; and a suction chamber connected to the suction chamber and directed to a surface of the substrate. Said film comprising an intake device for adsorbed on the substrate surface,
The brake shoe is provided between the inside of the upper surface of the casing and the upper part of the reel, and a bearing metal provided on a lower bearing of the casing and movable in the axial direction is always attached to the upper side by a coil spring. On the other hand, when the reel is mounted, the bearing metal is pushed down by receiving the lower shaft of the reel to compress the coil spring, and the bearing metal is The upper shaft of the reel is urged upward by the restoring force of a spring, and the upper shaft of the reel is inserted into the upper bearing, and the reel is supported in a state of being urged upward, so that the brake shoe is pressed against the reel. A writing board to which rotational resistance is given .

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