JPS6245919Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sheet winding type writing board device which has been improved so that it can be used in conjunction with a magnetic attraction type marking device.

FIG. 1 is a front view of the sheet winding type writing board, and FIG. 2 is a sectional plan view of the same.

In general, a sheet winding type writing board is equipped with a pair of winding shafts 1 and 2, and both ends of the rolled sheet 3 are wound around the winding shafts 1 and 2, respectively, and the central part is stretched toward the front. This is the structure you passed. and,
(See Figure 2) In order to write characters, figures, etc. with a marker pen, face the rolled sheet 3 stretched out on the front side (lower side in the figure) of the rolled sheet 3.
A back board 4 is installed on the back side of the roll sheet and is configured to support the pressure of the pen.

The sheet winding type writing board configured as described above writes characters, figures, etc. on the surface of the stretched roll sheet, and then rotates the winding shaft 1 or 2 to wind up the roll sheet 3. Stretch the new side of the roll sheet to the front and write letters, etc.
It is also used by rolling out the rolled sheet surface that has already been filled out to the front again. 5,5
5 is a motor for driving the winding shaft, 5a is a switch for the motor, and 6 is a speed reducer.

On the other hand, in blackboards using conventional chalkboards, blackboard paint is applied to the iron plate to form a board surface, and a magnetic attraction type display device can be attached to the board surface, which is widely used. .

It is also conceivable to combine the above-mentioned conventional techniques, for example, by constructing the back board 4 shown in FIG. 2 from an iron plate, sandwiching the roll sheet 3 and attaching the magnetic attraction type marking device 7 to the surface thereof, but as shown below. It has not been put into practical use yet due to some drawbacks.

Since the back board 4 is a member with a large area, it is possible to form it from an iron plate and to use a steel plate of such thickness that the back board has the required rigidity, or to provide reinforcement to give the back board the required rigidity. The weight of the writing board device is large, making it difficult to handle.

(b) For example, as shown in Fig. 2, the magnetic attraction type indicator 7 is pasted on the board surface, and without forgetting to remove it, the winding shaft 1 is driven in the winding direction to send the roll sheet 3 in the direction of arrow A. Then, the magnetic attraction type indicator 7 is also sent in the same direction and bites into the gap B between the cover 8 and the main body, so if the roll sheet 3 continues to be rolled up, the roll sheet 3 may be damaged or the roll sheet may be damaged. If the winding is blocked, the motor may be burnt out, and in severe cases, the rolled sheet may be torn.

The present invention was developed in view of the above circumstances, and is a sheet winding type that does not significantly increase the overall weight of the device and can also be used with magnetic attraction type markings without the risk of them getting stuck in gaps in the cover. The purpose is to provide a writing board device.

In order to achieve the above object, the present invention forms a thin layer of ferromagnetic material on the front surface of the backboard (the surface in contact with the roll sheet), except for both ends on the winding shaft side. It is characterized by

Next, an embodiment of the present invention will be described with reference to FIGS. 3 and 4.

Components with the same drawing reference numbers as in FIGS. 1 and 3 are the same components as in the prior art, and therefore their explanations will be omitted.

In this embodiment, the back board 4' is made of a non-magnetic and lightweight material such as an aluminum alloy plate or a foamed synthetic resin board, as in the conventional device, and is opposed to the front surface thereof, that is, the roll sheet 3. Paste steel paper 9 on the surface. However, as shown in FIG. 3, steel paper is pasted on area D shown by the imaginary line, leaving non-magnetic parts C and C' near the left end and right end of the front of the backboard 4', respectively.

In this embodiment, the backboard 4'
A thin layer of ferromagnetic material is formed on the side facing the roll sheet 3, except for the left and right ends. Since the steel paper 9 is a thin member, the increase in the overall weight of the writing board is negligible.

Receivers 10 and 10' are disposed below the non-magnetic parts C and C', respectively, and are attached to the frame member of the writing board.

Since the device of the present invention is configured as described above,
When a magnetic attraction type marking device 7 is pressed against the rolled sheet 3 stretched in front of the writing board, the marking device 7 sticks to the steel paper 9 provided behind the rolled sheet and maintains its position.

When the roll sheet 3 is sent in the direction of arrow A by driving the winding shaft 1 in the winding direction with the magnetic attraction type indicator 7 attached as described above, the magnetic attraction indicator 7 is also attached to the roll sheet 3. It moves in the direction of arrow A, but when it reaches the non-magnetic part C, it loses its attraction and holding force and falls into the saucer 10 provided below.
Therefore, there is no risk that the magnetic attraction type indicator 7 will bite into the gap B of the cover 8 and damage the roll sheet 3. Similarly, when the winding shaft 2 is driven in the winding direction to send the roll sheet 3 in the direction of the arrow E, and the magnetic attraction indicator 7 moves in the direction of the arrow E, the non-magnetic portion is
When it reaches C', it falls and is received by the saucer 10'.

In this way, it is possible to safely use magnetic attraction type markings, so for example, you can attach magnetic attraction type markings representing various map marks onto a sheet-rolling writing board on which a blank map is drawn. Roll-up sheets can be used to improve the educational effect of geography, or to help with music education by pasting magnetically attracted markers shaped like musical notes on a roll-up writing board with 5 lines written on them. The uses of writing boards can be dramatically expanded.

As explained above, the present invention provides a sheet winding type writing board device in which a back board installed on the back side of a roll sheet is made of a thin film of ferromagnetic material on the surface facing the roll sheet, except for the left and right ends. By forming the layer, the overall weight of the sheet-rolling writing board device does not increase significantly, and in addition, a magnetic attraction type marking device can be used together without the risk of it digging into gaps in the cover. It has excellent practical effects.

[Brief explanation of the drawing]

Fig. 1 is a front view of a sheet winding type writing board device commonly used in the past, Fig. 2 is a sectional plan view of the same,
FIG. 3 is a front view of a sheet winding type writing board device capable of displaying magnetic attraction markings according to an embodiment of the present invention, and FIG. 4 is a sectional plan view thereof. 1, 2... Winding shaft, 3... Roll sheet, 4,
4'...Backboard, 5...Motor, 6...Reducer, 7...Magnetic attraction type indicator, 8...Cover,
9...Steel paper comprising a thin layer of ferromagnetic material, 10...Saucer.

Claims (1)

[Scope of utility model registration request] In a sheet winding type writing board device, a thin layer of ferromagnetic material is formed on the surface of the back board placed on the back side of the roll sheet facing the roll sheet, except for both ends on the winding shaft side. A sheet winding type writing board device capable of displaying magnetic attraction markings.