JP4351596B2 - Blackboard replacement jig and blackboard replacement method using the same - Google Patents

Description

  The present invention relates to a blackboard replacement jig for repairing a blackboard in which chalk riding has deteriorated and a blackboard replacement method using the same.

A blackboard installed on the wall surface of a school or a conference room is made by sticking a blackboard with blackboard paint applied to the writing surface on the front side to a wall blackboard fixing substrate with an adhesive.
When the blackboard becomes old due to use, some of the blackboard paint on the writing surface may be peeled off or faded, resulting in poor chalk riding. Therefore, the blackboard is regularly repaired.
Conventionally, as a blackboard repair method, a blackboard steel sheet coated with blackboard paint on one side or a two-layer board backed with a veneer board on this blackboard steel sheet is cut to the size of a blackboard, and then left installed on the wall surface In general, a method of manually superposing and pasting on a writing surface of an old blackboard of a wall-surface blackboard fixed substrate that is peeled off from the wall surface and placed on the floor is generally performed.
However, since the blackboard has a large area and is heavy, there is a problem that a large number of workers are required to paste a new blackboard on the writing surface of the old blackboard.
In addition, since the replacement work relies on the operator's empirical intuition, new blackboards are often attached in a slightly misaligned state. The position of the worn blackboard has to be corrected, which requires a lot of labor for the work, and the work is complicated and lacks workability.
In order to solve these problems, the present applicant filed and patented (Patent Document 1) “It was rotated about the wall blackboard fixed substrate side and divided into a plurality of partial mounting members. A blackboard placement member, a sliding bracket that is disposed on the blackboard placement member, and is a locking means capable of locking the blackboard placement member and the chalk holder, and disposed on the upper edge of the blackboard placement member A blackboard repositioning apparatus comprising a new blackboard positioning means, a new blackboard slip prevention portion, and a blackboard placement member support means is disclosed.
Japanese Patent No. 3478928

However, the above conventional techniques have the following problems.
(1) The blackboard replacement device described in (Patent Document 1) can significantly improve the labor saving of the blackboard replacement work, and can attach the blackboard to the correct position with a simple operation, resulting in low cost. Although it has the effect and effect of being excellent in mass productivity, it supports further simplification of the mechanism, cost reduction and productivity by reducing the number of parts, improvement of transportability, and replacement of blackboards of various dimensions and shapes It has been desired to improve the versatility, handling, positioning accuracy, and workability.
(2) The blackboard replacement device described in (Patent Document 1) is mounted on the blackboard during transportation or storage of the blackboard replacement device because the sliding bracket is integrally disposed on the blackboard mounting member. The sliding metal fitting which protruded from the member became a hindrance and had the subject that handling nature was lacking. Further, when the sliding bracket is made detachable, there is a problem that the assembling work is required and the workability is lacking. Furthermore, since the blackboard placement member and the chalk holder are locked by the sliding metal fittings disposed on the blackboard placement member during the replacement work, the replacement is performed if there is not enough space to install the blackboard replacement device in front of the blackboard. There was a problem that the work could not be performed and lacked versatility.

  The present invention solves the above-mentioned conventional problems, and has a simple configuration with a small number of parts, low cost, high productivity, easy disassembly and assembly, excellent transportability, and a blackboard having various sizes and shapes. On the other hand, reliability that enables accurate positioning and replacement, provision of a blackboard replacement jig that excels in versatility, and workability and productivity that enable reliable replacement of the blackboard in a short time The purpose is to provide an excellent blackboard replacement method.

In order to solve the above problems, a blackboard replacement jig and a blackboard replacement method using the same according to the present invention have the following configurations.
A blackboard replacement jig according to claim 1 of the present invention is a blackboard replacement jig for replacing an old blackboard fixed to the surface of a wall blackboard fixing substrate, comprising: a. A fixed portion that is detachably fixed at both end positions in the longitudinal direction of a new blackboard to the bottom surface of the powder receiver disposed at the lower end of the wall blackboard fixed substrate or the wall blackboard fixed substrate, and is drilled in the fixed portion. The fixing portion mounting hole, the vertical fixing portion suspended at the end of the fixing portion, the vertical fixing hole drilled in the vertical fixing portion, and the sliding having the vertical support portion suspended at the end A guide portion; a vertical positioning hole bored in the vertical support portion; a support fixture fixing portion which is inserted through the vertical fixing hole and the vertical positioning hole and detachably fixes the fixing portion and the sliding guide portion; , and the end support having a, b. A blackboard placement portion formed in a substantially rectangular plate shape or a substantially rectangular frame shape and provided with a magnet for magnetizing the writing surface of the new blackboard at a predetermined position on the upper surface, and a longitudinal direction of one end portion of the blackboard placement portion Two or more supporting leg portions, and the other end portion of the blackboard placing portion facing the supporting leg portion is placed on the sliding guide portion of the end support tool. And a blackboard holder.
This configuration has the following effects.
(1) Wall blackboard fixed substrate or an end support that is detachably fixed to the bottom surface of the powder receiver disposed at the lower end of the wall blackboard fixed substrate, and a new blackboard that holds the end mounted on the end support Since the blackboard holder to be placed is formed separately, it can be used in combination with different types of end support and blackboard holder according to the size and shape of the new blackboard, and it is excellent in versatility and small size Thus, only the lightweight end support can be independently positioned and fixed to the bottom surface of the wall blackboard fixing substrate or the like, and the workability is excellent.
(2) Since the end support has a fixing portion, it can be easily and detachably fixed to the bottom surface of the wall blackboard fixing substrate or the like.
(3) Since the end support has a sliding guide portion that extends or is detachably disposed on the fixed portion, the end of the blackboard holder can be placed, and the blackboard holder can be easily rotated. The blackboard holder can be slid along the sliding guide and pressed against the surface of the old blackboard.
(4) Since the blackboard placement portion of the blackboard holder is formed in a substantially rectangular plate shape or a substantially rectangular frame shape, it is possible to stably support a new blackboard by selecting dimensions according to the new blackboard. In addition, when pressing a new blackboard against the surface of the old blackboard, the entire surface or the four sides of the outer periphery can be surely pressed.
(5) Since it has a magnet that magnetizes the writing surface of the new blackboard at a predetermined position on the upper surface of the blackboard mounting section, it can hold the new blackboard reliably and rotate or slide the blackboard holder The position of the new blackboard is not displaced when the image is placed, and can be repositioned with high accuracy.
(6) Since the end support and the blackboard holder are formed separately, and the magnet for magnetizing the new blackboard is arranged on the blackboard holder, when there is not enough space around the wall blackboard fixing board, Attaching the end support and magnetically attaching the new blackboard to the blackboard holder can be done at different locations. Replacement work can be performed.
(7) Since two or more support legs are arranged in the longitudinal direction of one end of the blackboard placement portion, the other end of the blackboard placement portion facing the support leg is placed on the end support. When this occurs, the blackboard holder can be made independent and can be replaced by one person or a small number of people.
(8) Since the end support can be independently fixed at any position on the bottom surface of the wall blackboard fixing board, etc., only the blackboards that need to be replaced among the two or more blackboards arranged side by side You can select and re-paste.
(9) Since the end support has a vertical fixing part suspended from the end of the fixed part and a vertical support part suspended from the end of the sliding guide part, the vertical fixing part of the fixing part By bringing the vertical support portion of the sliding guide portion into contact, the sliding guide portion can be guided by the fixed portion, the sliding guide portion can be held horizontally, and a highly accurate replacement work is performed. be able to.
(10) Since the end support has a fixing portion mounting hole formed in the fixing portion, it can be easily screwed and fixed to the wall blackboard fixing substrate or the bottom surface of the powder receiver.
(11) Since the vertical fixing hole is drilled in the vertical fixing part and the vertical positioning hole is drilled in the vertical support part, the height of the fixing part and the sliding guide part can be easily adjusted by the support fixing part. The end support and auxiliary support can be easily disassembled and assembled.
(12) The height of the fixed part and the sliding guide part can be adjusted freely by the vertical fixing hole and the vertical positioning hole, so that if the powder holder cannot be removed from the wall blackboard fixing board or the old blackboard Even when the lower end is shifted, the sliding guide can be easily aligned with the upper surface of the powder receiver or the lower end of the old blackboard, and the blackboard holder can be reliably guided to perform the replacement work.

Here, the end support is preferably formed of a lightweight material having mechanical strength, such as aluminum or aluminum alloy. The end supporter is detachably fixed by screwing the fixing portion to the bottom surface of the wall holder fixed to the wall blackboard fixing substrate or the bottom of the wall blackboard fixing substrate. When the powder receiver disposed at the lower end of the wall blackboard fixing substrate is detachable, the end support can be attached to the bottom surface of the wall blackboard fixed substrate after removing the powder receiver. Moreover, when a powder receiving groove is formed in the powder receiver and the powder receiver cannot be removed, a step is eliminated by filling the powder receiving groove with a buried tree or the like, and the blackboard holder can be slid reliably. When a presser edge is provided on the outer periphery of the blackboard surface, the presser edge is removed and then reattached, and the presser edge is attached after completion of the replacement work.
Each part of the blackboard holder is preferably made of a lightweight and mechanical material such as aluminum or wood. Thereby, workability | operativity at the time of conveyance can be improved. In particular, when the blackboard placement portion is formed in a frame shape, it is lighter and has excellent transportability and handleability. The blackboard placement part is reinforced by disposing one or more horizontal and vertical bars on the back of the blackboard placement part formed in a plate shape and inside the frame of the blackboard placement part formed in a frame shape. Deformation and damage can be prevented. Moreover, a hand can be put on a horizontal crosspiece or a vertical crosspiece, and conveyance property and handling property can be improved. In particular, when a horizontal beam or a vertical beam is attached by screwing or fitting, it can be attached and detached as necessary during transportation or re-attaching work, and is excellent in handling and workability.

  The size of the blackboard mounting portion is slightly smaller than the size of the wall blackboard fixing substrate. As a result, the dimensional error of the wall blackboard fixing board can be absorbed, and when the new blackboard is pressed against the surface of the old blackboard by the blackboard mounting part, the blackboard holding frame on the outer periphery of the blackboard mounting part and the wall blackboard fixing board No interfering and excellent positioning reliability. Since the length in the longitudinal direction of a general blackboard is formed to be an integral multiple of 900 mm, a blackboard placement portion corresponding to 900 mm and 1800 mm may be prepared. By combining them, it is possible to cope with a size of 2700 mm, 3600 mm or more. Moreover, you may form a frame-shaped blackboard mounting part so that expansion-contraction is possible in a longitudinal direction. Thereby, the blackboard with a different magnitude | size can be replaced with one type of blackboard holder, and it is excellent in versatility. Moreover, the length can be adjusted and used for a blackboard of a nonstandard size, and the functionality is excellent.

If the base of the old blackboard is a magnet, the new blackboard may be attracted by the magnetic force of the old blackboard when the blackboard holder is placed upright on the sliding guide. Accordingly, an auxiliary magnet for magnetically attaching and fixing the new blackboard to the blackboard placement portion may be added. In addition, the auxiliary magnetized portion on which the auxiliary magnet is disposed is rotatably disposed on the side of the blackboard mounting portion or the like, and the magnetized surface of the auxiliary magnet is directed to the upper surface of the blackboard mounting portion as necessary. A new blackboard may be magnetically attached.
When the new blackboard is of the magnet type, it is preferable to weaken the magnetic force of the magnets disposed on the upper surface of the blackboard placement portion or reduce the number of magnets. Thereby, it can prevent that a new blackboard is strongly magnetically attached to a blackboard mounting part, and can perform positioning easily. By providing the above-mentioned auxiliary magnetized part, it is possible to firmly magnetize a new blackboard by rotating the auxiliary magnetized part after positioning, and it is possible to perform a replacement work without causing a positional shift, Excellent reliability and versatility.
A permanent magnet, an electric magnet, etc. are employable as a magnet and auxiliary magnet arrange | positioned at the upper surface of a blackboard mounting part, or an auxiliary | assistant magnetizing part. In the case of an electromagnet, it is possible to easily switch ON and OFF to fix or unfix a new blackboard, and to easily perform positioning and pasting operations.
The vertical fixing hole and / or the vertical positioning hole is formed with a plurality of holes in the vertical direction or in the shape of a long hole. As a result, the height of the fixed portion and the sliding guide portion can be easily adjusted, and the blackboard holder can be guided regardless of the height of the powder receiver and the amount of displacement in the height direction between the wall blackboard fixed substrate and the old blackboard. . In particular, when the vertical fixing hole and / or the vertical positioning hole is formed in a long hole shape, the height can be finely adjusted, the positioning accuracy can be improved, and the reliability is excellent.
The invention according to claim 2 is the blackboard replacement jig according to claim 1, wherein the end supporter stands on either the left or right end of the fixed portion or the sliding guide portion. It has the structure provided with the provided side surface positioning part.
With this configuration, in addition to the operation of the first aspect, the following operation is provided.
(1) Since the side positioning part is erected at either the left or right end of the fixed part of the end support or the sliding guide part, both ends of the blackboard placement part of the blackboard holder are reliably guided. And the blackboard holder can be slid on the sliding guide without causing a lateral displacement.
(2) When the side positioning part is erected at the end of the sliding guide part, the end face of the side positioning part is the surface of the old blackboard with the upper surface of the fixing part being in contact with the bottom surface of the wall blackboard fixing board. And can be easily positioned at an arbitrary position in the longitudinal direction of the wall blackboard fixing substrate, and the end support can be securely attached.
Here, the side positioning part may be formed integrally by bending the end part of the fixed part or the sliding guide part upward, or another member is fixed to the side part of the fixed part or the sliding guide part by screwing or the like. May be. When the side positioning part is provided in the fixed part, the guide surface of the side positioning part can be fixed so that it abuts against the wall blackboard fixed board or the end face of the powder receiver. Can be suitably used when the whole wall-surface blackboard fixing substrate is pasted in the entire longitudinal direction.
When the side positioning part is provided in the sliding guide part, the fixed part can be fixed to the wall blackboard fixed board or powder receiver at any position in the longitudinal direction of the wall blackboard fixed board, and a part of the old blackboard in the longitudinal direction It can be suitably used when only reattaching. When the powder receiver is removed from the wall blackboard fixed board and the fixed part is directly attached to the bottom of the wall blackboard fixed board, it can be mounted so that the end face of the side positioning part abuts against the surface of the old blackboard The blackboard holder can be reliably slid and guided to the surface of the old blackboard. In addition, even when the powder receiver cannot be removed from the wall blackboard fixed board, the lower end surface of the side wall positioning board on the wall blackboard fixed substrate side is powdered by extending the side positioning part to the wall blackboard fixed board side by the width of the powder receiver. Can be attached so that the end face of the side surface positioning portion abuts against the surface of the old blackboard, so that the blackboard holder can be reliably slid and guided to the surface of the old blackboard.
If a side guide adjustment part is provided that slidably fixes the side positioning part in the thickness direction of the wall blackboard fixing board relative to the sliding guide part, even if the wall blackboard fixing board has a different thickness, The end face can be moved and fixed so as to abut against the surface of the old blackboard, and the blackboard holder can be reliably slid and guided to the surface of the old blackboard, which is excellent in versatility and workability.
As the side guide adjusting part, a slotted adjustment hole is formed in the side part of the sliding guide part and / or the side positioning part and screwed and fixed, or a convex part and a concave part that are fitted to each other are formed and screwed. Those fixed by fastening or pin fitting are preferably used.

The invention according to claim 3 is the blackboard replacement jig according to claim 1 or 2 , wherein the wallboard blackboard fixing substrate or a bottom surface of a powder receiver disposed at a lower end of the wallboard blackboard fixing substrate is long. Having a structure including one or more auxiliary supports having a fixed portion that is detachably fixed at an arbitrary position in the direction, and a sliding guide portion that is extended or detachably disposed on the fixed portion. is doing.
With this configuration, in addition to the operation of the first or second aspect , the following operation is provided.
(1) By having one or more auxiliary supports that are detachably fixed to the wall-surface blackboard fixed substrate or the bottom surface of the powder receiver at an arbitrary position in the longitudinal direction, When performing the replacement, it is possible to support the main point in the longitudinal direction of the blackboard mounting portion, and it is possible to reliably guide when the blackboard holder slides.
(2) Since the auxiliary support has a fixing portion, it can be easily attached to and detached from the bottom surface of the wall blackboard fixing substrate or the like.
(3) Since the auxiliary support has a sliding guide portion that extends or is detachably disposed on the fixed portion, the end of the blackboard holder can be placed, and the blackboard holder that is upright can be securely mounted. The blackboard holder can be slid along the sliding guide and pressed against the old blackboard.

Here, the auxiliary support is formed of the same material as the above-described end support. Moreover, an auxiliary | assistant support tool is attached to the wall blackboard fixed board | substrate and the bottom face of a powder receiver in the procedure similar to an edge part support tool. The number of auxiliary supports and the mounting interval are appropriately selected according to the length of the blackboard and the degree of curvature of the wall blackboard fixing substrate.
It is preferable that the length of the sliding guide portion of the auxiliary support tool is longer than the length of the sliding guide portion of the end support tool. Thereby, when replacing a blackboard with respect to the curved wall surface blackboard fixed board | substrate, important parts, such as the center part of the longitudinal direction of a blackboard mounting part, can be supported reliably, and it is excellent in workability.

A fourth aspect of the present invention is the blackboard pasting jig according to the third aspect , wherein the auxiliary support has a fixed portion mounting hole formed in the fixed portion, and the auxiliary support The sliding guide portion is configured to extend in the fixing portion and project in the horizontal direction in front of the wall-surface blackboard fixing substrate.
With this configuration, in addition to the operation of the third aspect , the following operation is provided.
(1) Since the fixing portion mounting hole is formed in the fixing portion of the auxiliary support tool , it can be easily fixed by screwing and is excellent in detachability.
(2) Since the sliding guide part of the auxiliary support is formed to extend to the fixed part, the fixed part and the sliding guide part can be formed integrally, and the number of parts is small and the productivity is increased. Excellent.
(3) Since the fixing part and the sliding guide part of the auxiliary support are integrally formed, fixing means and positioning work for fixing the fixing part and the sliding guide part become unnecessary, and only the fixing part is positioned and fixed. Thus, the blackboard holder can be reliably supported and guided by the sliding guide portion.
(4) Since the sliding guide part extends from the fixed part and protrudes horizontally in front of the wall blackboard fixed board, it supports the blackboard holder by attaching it directly to the bottom of the wall blackboard fixed board. , Can guide.

Here, it is preferable that two or more fixing portion mounting holes are formed in the longitudinal direction of the wall blackboard fixing substrate. As a result, the fixing portion can be firmly fixed to the bottom surface of the wall blackboard fixing substrate or the like with a screw, and the end support and auxiliary support can rotate when the blackboard holder is slid on the sliding guide portion. And can reliably support and guide the blackboard holder. In addition, when the fixing part mounting hole is formed in the shape of a long hole in a direction parallel to or perpendicular to the longitudinal direction of the wall blackboard fixing board, the mounting position of the end supporter and auxiliary supporter can be easily adjusted in the left-right or front-rear direction. And workability is excellent.
When both sides of the fixed part and / or the sliding guide part are bent downward to form a substantially U-shaped cross section, the rigidity of the fixed part and / or the sliding guide part can be increased. In particular, when the sliding guide is formed in a substantially U-shaped cross section, it slides when the end of the blackboard holder is placed on the sliding guide or when the blackboard holder is turned upright. It is possible to prevent the guide portion from being deformed, and the reliability is excellent.

A fifth aspect of the present invention is the blackboard pasting jig according to the third aspect , wherein the auxiliary support is vertically fixed to the end of the fixed portion, and to the fixed portion. A fixing hole that is drilled, a vertical fixing hole that is drilled in the vertical fixing section, a vertical support section that is suspended from an end of the sliding guide section, and a hole that is drilled in the vertical support section. The vertical positioning hole, and the vertical fixing hole and the support fixing portion that is inserted through the vertical positioning hole and detachably fixes the sliding portion and the sliding guide portion.
With this configuration, in addition to the operation of the third aspect , the following operation is provided.
(1) Since the auxiliary support device has a vertical fixing portion suspended from the end of the fixing portion and a vertical support portion suspended from the end of the sliding guide portion, the auxiliary supporting tool slides on the vertical fixing portion of the fixing portion. By abutting the vertical support part of the moving guide part, the sliding guide part can be guided by the fixed part, the sliding guide part can be held horizontally, and an accurate replacement work is performed. Can do.
(2) Since the auxiliary support has a fixing portion mounting hole formed in the fixing portion, it can be easily screwed and fixed to the wall blackboard fixing substrate or the bottom surface of the powder receiver.
(3) Since the vertical fixing hole is formed in the vertical fixing portion and the vertical positioning hole is formed in the vertical supporting portion, the height of the fixing portion and the sliding guide portion can be easily adjusted by the support fixing portion. The auxiliary support can be easily disassembled and assembled.
(4) The height of the fixed part and sliding guide part can be adjusted freely by the vertical fixing hole and the vertical positioning hole, so that if the powder catcher cannot be removed from the wall blackboard fixing board or the old blackboard Even when the lower end is shifted, the sliding guide can be easily aligned with the upper surface of the powder receiver or the lower end of the old blackboard, and the blackboard holder can be reliably guided to perform the replacement work.
be able to.

  Here, the vertical fixing hole and / or the vertical positioning hole are formed in a plurality of holes in the vertical direction or in the shape of a long hole. As a result, the height of the fixed portion and the sliding guide portion can be easily adjusted, and the blackboard holder can be guided regardless of the height of the powder receiver and the amount of displacement in the height direction between the wall blackboard fixed substrate and the old blackboard. . In particular, when the vertical fixing hole and / or the vertical positioning hole is formed in a long hole shape, the height can be finely adjusted, the positioning accuracy can be improved, and the reliability is excellent.

The invention according to claim 6 is the blackboard pasting jig according to any one of claims 1 to 5 , wherein the blackboard placement portion of the blackboard holder is divided in the longitudinal direction. A plurality of partial placement members, a connection fitting provided on the back surface on the contact side between the adjacent partial placement members, and at least one of the left and right ends of the connection fitting as the partial placement member The coupling member includes a coupling member that is detachably fixed, and an elastic member that is disposed between the coupling fitting and at least one of the left and right coupling members.
With this configuration, in addition to the operation of any one of claims 1 to 5 , the following operation is provided.
(1) Since the blackboard placement portion is divided into a plurality of partial placement members in the longitudinal direction, and the adjacent partial placement members are detachably fixed by the coupling members via the connecting metal fittings, the partial placement can be easily performed. The members can be connected and divided, and can be replaced corresponding to blackboards having different dimensions in the longitudinal direction.
(2) Since the plurality of partial placement members are detachably fixed by the coupling member, they can be easily divided, and can be made compact and easily transported and stored.
(3) Since the connecting bracket for fixing the partial placement member with the coupling member is provided on the back surface on the contact side between the partial placement members, there is no protrusion or step on the upper surface of the blackboard placement portion. A new blackboard can be stably placed and held magnetically.
(4) Since the elastic member is disposed between the connecting bracket and at least one of the left and right coupling members, the elastic member can be compressed and deformed between the coupling bracket and the coupling member. Since the blackboard placement part can be deformed so that it can be bent at the connection point between the two, even if the wall blackboard fixing board is curved, the blackboard placement part can be reliably pressed against the old blackboard, easily You can perform the replacement work.
(5) Since the coupling member has a coupling member that detachably fixes at least one of the left and right end portions of the connection fitting to the partial placement member, only the left or right end portion of the connection fitting is partially coupled by the coupling member. If the other end portions of the connecting metal fittings are brought into contact with the back surface of the partial placement member, the adjacent partial placement members can be held so as to be foldable at the joint location.
(6) Even when the left and right ends of the connection fitting are fixed to the partial placement member by the coupling member, the elastic member is disposed between the connection fitting and at least one of the left and right coupling members. Adjacent partial placement members can be deformed so as to be bent at the joint.

Here, by increasing the number of divisions of the blackboard placement section and shortening the longitudinal dimension of the partial placement member, it is possible to reliably and efficiently replace the old blackboard on the curved wall blackboard fixing board. Excellent workability.
The connection fitting is formed with a substantially circular or elongated connection hole at each end, and is screwed by a connecting member such as a screw. In addition, when one of the connecting holes at both ends is opened and formed into a notch shape, the connecting bracket can be easily slid or rotated by slightly loosening the coupling member, and the connection can be easily released to mount a plurality of parts. It can be divided into mounting members and has excellent workability.
In addition, when an elastic member is disposed between the connection fitting and either the left or right coupling member, the other end of the connection fitting is bent to the upper surface side of the blackboard mounting portion to form a locking portion. It is preferable to do. Thereby, the adjacent partial placement members can be firmly fixed to each other, occurrence of positional displacement and rotation in the vertical and horizontal directions of the partial placement members can be reduced, and the positioning accuracy of the new blackboard can be improved. it can. Alternatively, two or more connecting metal fittings may be provided on adjacent partial placement members, and the connection metal fittings of adjacent partial placement members may be brought into contact with each other so that the partial placement members do not slide back and forth. One connecting bracket disposed on the other partial mounting member is sandwiched between two connecting brackets disposed on one partial mounting member, or a connecting bracket disposed on at least one partial mounting member is provided. When the connection fitting formed in the substantially U-shape and disposed on the other partial placement member is sandwiched, the partial placement member can be more reliably prevented from sliding back and forth, and the positioning reliability is excellent.

As the elastic member, an elastic body such as polyurethane resin, soft synthetic rubber, or coil spring can be suitably used.
It is preferable to dispose the support leg at at least one place in the longitudinal direction of the partial placement member. Thereby, when connecting a some partial mounting member, the whole blackboard mounting part can be stably supported by the support leg part arrange | positioned at each partial mounting member. In addition, it is preferable to arrange | position a support leg part to the both ends of a longitudinal direction at least one partial mounting member among the adjacent partial mounting members. Thereby, the contact side between the adjacent partial mounting members can be reliably supported, and the partial mounting members can be prevented from rotating. Moreover, the partial mounting member which has a support leg part in the both ends of a longitudinal direction can be used independently as a blackboard mounting part.
When equipped with a support leg pivot support that pivotally supports the support leg relative to the blackboard placement part, the support leg can be folded when transported or not in use. Excellent.
In addition, since the support leg can be rotated by the support leg shaft support part and folded to the back side of the blackboard placement part, the support leg can be obstructed when the blackboard holder is pressed against the old blackboard during the replacement work. Therefore, workability can be improved.
As the support leg shaft support portion, a shaft support means such as a hinge is preferably used. In particular, when the support leg shaft support portion has a stopper mechanism that prevents the rotation by fixing the support leg portion when standing or folding, the safety leg and the handleability are excellent. Also, instead of providing a stopper mechanism on the support leg shaft support part, a hook-like support leg locking member is disposed on the support leg part, and the locking protrusion for locking the support leg locking member to the blackboard placement part May be provided, and when the support leg is folded, the support leg locking member may be locked to the locking protrusion to fix the support leg.

When the supporting leg includes a tubular part, a sliding leg inserted slidably into the tubular part, and a supporting leg fixing part for fixing the tubular part and the sliding leg, By adjusting the position of the moving leg, the length of the entire support leg can be changed freely, and the blackboard holder can be stabilized almost horizontally according to the mounting height of the end support and auxiliary support. Can be supported. In addition, since the support leg portion has a simple configuration in which the slide leg portion is simply inserted and slid into the tubular portion, the number of parts is small, the weight is light, and the blackboard holder can be easily carried.
The tubular portion is preferably formed of a round or square pipe that is lightweight and excellent in mechanical strength. A support leg fixing part such as a screw or a pin is screwed or inserted into the side part of the tubular part, and an end part of the support leg fixing part is screwed, engaged or fitted to the side part of the sliding leg part. Thus, the tubular portion and the sliding leg portion are fixed. Height adjustment can be performed by previously forming a plurality of female screw portions, engaging concave portions, and fitting holes in the longitudinal direction of the side portion of the sliding leg portion.
In addition, when the sliding leg is made of wood, it can be screwed with a support leg fixing part such as a screw at any position without any special processing. Excellent versatility.

In the blackboard replacement method according to claim 7 of the present invention, the fixing portion of the end support of the blackboard replacement jig according to any one of claims 1 to 6 is used as the wall surface blackboard fixing substrate or the An end support attaching step for detachably fixing the bottom of the powder receiver disposed at the lower end of the wall blackboard fixing substrate at both longitudinal end positions of the new blackboard, and facing the support leg of the blackboard holder A blackboard holder mounting step of mounting the end of the blackboard holder on the sliding guide portion of the end support; and the blackboard mounting portion by the support leg of the blackboard holder A blackboard placement part supporting step for supporting, a blackboard magnetic attachment process for magnetically attaching the writing surface of the new blackboard to the predetermined position on the upper surface of the blackboard placement part of the blackboard holder by the magnet, and the surface of the old blackboard And / or an adhesive layer forming process for forming an adhesive layer on the back of the new blackboard And a blackboard placement portion rotating step of pushing up the end portion on the support leg portion side of the blackboard placement portion so that the blackboard placement portion stands upright on the sliding guide portion of the end portion support tool, A blackboard placement portion sliding step for sliding the blackboard placement portion toward the old blackboard side, and a blackboard pressing step for pressing the new blackboard against the old blackboard.
This configuration has the following effects.
(1) Since the end support fixture fixing process can removably fix the end support fixture to the wall blackboard fixing substrate or the bottom surface of the powder receiver at both longitudinal positions of the new blackboard, The blackboard holder can be reliably supported according to the size of the blackboard and the repositioning position.
(2) Through the blackboard holder mounting step, the end of the blackboard mounting portion facing the support leg of the blackboard holder can be mounted on the sliding guide portion of the end support and Since the blackboard placement portion can be supported by the support leg portion of the blackboard holder by the placement portion supporting step, the blackboard holder can be made independent and can be re-worked by one person or a small number of people.
(3) Since the writing surface of the new blackboard can be magnetically attached to a predetermined position on the upper surface of the blackboard mounting portion of the blackboard holder by the blackboard magnetic attachment process, the new blackboard can be securely held by the blackboard holder. It is possible to easily move and replace.
(4) Since the adhesive layer can be formed on the front surface of the old blackboard and / or the back surface of the new blackboard by the adhesive layer forming step, the blackboard mounting portion is rotated in the blackboard mounting portion rotating step, After sliding the blackboard placement part to the old blackboard side in the placement part sliding process, you can easily and reliably replace the blackboard simply by pressing the new blackboard against the old blackboard in the blackboard pressing process. Air pockets can be prevented from occurring in the center of the blackboard.
(5) Since the end portion of the blackboard placement portion is placed on the sliding guide portion of the end support by the blackboard holder placement step, the blackboard placement portion in the blackboard placement portion rotation step It is possible to easily push up the end portion of the support leg side upward and to stand upright on the sliding guide portion of the end support tool.
(6) Since the blackboard placement portion can be slid to the old blackboard side by the blackboard placement portion sliding step, the new blackboard can be pressed against the old blackboard on the entire blackboard placement portion.
(7) By the blackboard pressing step, the new blackboard can be surely pressed, firmly bonded to the old blackboard, and peeling can be prevented.

Here, if the end support mounting process with a right positioning step by side positioning portion, by pre-side positioning portion, it is possible to easily position the bonding replacement position of the blackboard, blackboard placement unit rotating step and In the blackboard placement portion sliding step, both ends of the blackboard placement portion can be reliably guided to the replacement position, and the replacement can be performed with high accuracy without causing a positional shift.
In the adhesive layer forming step, the adhesive layer can be formed by applying a double-sided tape, in addition to applying the adhesive with a brush or roller, or spraying it with a spray. In particular, acrylic ester-based high-concentration aqueous adhesive / adhesive is excellent in adhesive strength, heat resistance, and water resistance, and can be suitably used. In addition, since the sticky / adhesive can be removed by using a sticky / adhesive solvent such as toluene, the old blackboard can be peeled off and replaced with a new blackboard, and the old blackboard can be recycled.
In the blackboard pressing step, by pressing the surface of a new blackboard to every corner with a pressing device such as a roller, reliable bonding can be performed, and the durability of the adhesive layer is excellent.

The invention of claim 8 is a blackboard paste replacement method according to claim 7, claim 3 or blackboard paste replacement jig according to any one of 5 the auxiliary support one or more, It has the structure provided with the auxiliary | assistant support attachment process which detachably fixes to the bottom face of the powder receiver arrange | positioned at the lower end of the said wall-surface blackboard fixed board | substrate or the said wall-surface blackboard fixation board | substrate in the arbitrary positions of a longitudinal direction.
With this configuration, in addition to the operation of the seventh aspect , the following operation is provided.
(1) Since one or more auxiliary supports are detachably fixed at any position in the longitudinal direction on the bottom surface of the wall blackboard fixing substrate or powder receiver by the auxiliary support mounting process, the large blackboard or curved wall blackboard is fixed. When the blackboard is replaced with the substrate, it is possible to support the main points in the longitudinal direction of the blackboard mounting portion, and it is possible to reliably guide when the blackboard holder slides.
Here, when the end support attachment step and the auxiliary support attachment step include a slide guide height adjustment step for adjusting the height by moving the slide guide portion up and down with respect to the fixed portion, the slide guide The part can be aligned with the upper surface of the powder receiver and the lower end of the old blackboard, and can be replaced with high accuracy, which is excellent in reliability and versatility.

As described above, according to the blackboard replacement jig and the blackboard replacement method using the same according to the present invention, the following advantageous effects can be obtained.
According to invention of Claim 1, it has the following effects.
(1) A wall blackboard fixing substrate or an end support that is detachably fixed to the bottom surface of the powder receiver disposed at the lower end of the wall blackboard fixing substrate, and a new blackboard that holds the end on the end support Since the blackboard holder to be placed is formed separately, different types of end supports and blackboard holders can be used in combination according to the size and shape of the new blackboard, and the small and lightweight end It is possible to provide a blackboard replacement jig excellent in versatility and workability, in which only the part support can be easily positioned and fixed independently on the bottom surface of the wall blackboard fixing substrate or the like.
(2) Since the end support has a sliding guide portion extending or detachably arranged on the fixed portion, the end of the blackboard holder can be placed, and the blackboard holder can be easily rotated. A blackboard-replacement jig with excellent workability that can be moved upright on the sliding guide and can be slid along the sliding guide and pressed against the surface of the old blackboard Can be provided.
(3) Since the blackboard placement part of the blackboard holder is formed in a substantially rectangular plate shape or a substantially rectangular frame shape, a new blackboard can be stably supported by selecting dimensions according to the blackboard to be replaced. It is possible to provide a blackboard replacement jig excellent in reliability and workability that can reliably press the entire surface or the four sides of the outer periphery when pressing a new blackboard against the surface of an old blackboard. .
(4) Since the end support and the blackboard holder are formed separately and the blackboard holder is magnetized to magnetize a new blackboard, if there is not enough space around the wall blackboard fixing board, Attaching the end support and magnetically attaching the new blackboard to the blackboard holder can be done at different locations. It is possible to provide a blackboard-replacement jig that is excellent in versatility and workability in which replacement work can be performed.
(5) Since the end support can be independently fixed at an arbitrary position on the bottom surface of the wall blackboard fixing substrate, etc., only the blackboards that need to be replaced among the two or more blackboards arranged side by side It is possible to provide a blackboard replacement jig that is excellent in versatility and workability, which can be selected and replaced.
(6) Since the end support has a vertical fixing part suspended from the end of the fixed part and a vertical support part suspended from the end of the sliding guide part, the vertical fixing part of the fixing part By bringing the vertical support portion of the sliding guide portion into contact, the sliding guide portion can be guided by the fixed portion, the sliding guide portion can be held horizontally, and a highly accurate replacement work is performed. It is possible to provide a blackboard-replacement jig having excellent workability and reliability.
(7) Since the vertical fixing hole is drilled in the vertical fixing part and the vertical positioning hole is drilled in the vertical support part, the height of the fixing part and the sliding guide part can be adjusted easily by the support fixing part. It is possible to provide a blackboard-replacement jig that is easy to disassemble and assemble and can be easily assembled and assembled, and has excellent workability and handleability.
(8) The height of the fixed part and sliding guide part can be adjusted freely by the vertical fixing hole and the vertical positioning hole, so that if the powder holder cannot be removed from the wall blackboard fixing board or the old blackboard Even if the lower end is displaced, the sliding guide can be easily aligned with the upper surface of the powder receiver or the lower end of the old blackboard, and it can reliably guide the blackboard holder to perform the replacement work. It is possible to provide a blackboard-replacement jig having excellent properties and versatility.
According to invention of Claim 2, in addition to the effect of Claim 1, it has the following effects.
(1) Since the side positioning part is erected at either the left or right end of the fixed part of the end support or the sliding guide part, both ends of the blackboard placement part of the blackboard holder are reliably guided. Therefore, it is possible to provide a blackboard replacement jig that is excellent in reliability and workability, in which the blackboard holder can be slid on the sliding guide portion without causing a lateral displacement.
(2) Since the side positioning part is erected at the end of the sliding guide part, the end face of the side positioning part is placed on the old blackboard while the upper surface of the fixing part is in contact with the bottom surface of the wall blackboard fixing board. It can be pressed against the surface, can be easily positioned at any position in the longitudinal direction of the wall blackboard fixed board, and can be securely attached to the end support. A blackboard replacement jig can be provided.

According to invention of Claim 3 , in addition to the effect of Claim 1 or 2 , it has the following effects.
(1) By having one or more auxiliary supports that are detachably fixed to the wall blackboard fixed board or the bottom of the powder receiver at an arbitrary position in the longitudinal direction, the blackboard can be used against a large blackboard or a curved wall blackboard fixed board. When re-placing, blackboard repositioning treatment with excellent versatility and reliability that can support important points in the longitudinal direction of the blackboard mounting part and can reliably guide when the blackboard holder slides Tools can be provided.

According to invention of Claim 4 , in addition to the effect of Claim 3 , it has the following effects.
(1) Since the sliding guide part of the auxiliary support is formed to extend to the fixed part, the fixed part and the sliding guide part can be integrally formed, the number of parts is small, the productivity, It is possible to provide a blackboard-replacement jig with excellent handleability.
(2) Since the fixing part and the sliding guide part of the auxiliary support are integrally formed, there is no need for fixing means and positioning work for fixing the fixing part and the sliding guide part, and only the fixing part is positioned and fixed. Therefore, it is possible to provide a blackboard replacement jig excellent in workability that can reliably support and guide the blackboard holder by the sliding guide portion.
(3) Since the sliding guide part extends from the fixed part and protrudes horizontally in front of the wall blackboard fixed board, it supports the blackboard holder by attaching it directly to the bottom of the wall blackboard fixed board. It is possible to provide a blackboard-replacement jig excellent in workability that can be guided.

According to invention of Claim 5, in addition to the effect of Claim 3 , it has the following effects.
(1) Since the auxiliary support device has a vertical fixing portion suspended from the end of the fixing portion and a vertical support portion suspended from the end of the sliding guide portion, the auxiliary supporting tool slides on the vertical fixing portion of the fixing portion. By abutting the vertical support part of the moving guide part, the sliding guide part can be guided by the fixed part, the sliding guide part can be held horizontally, and an accurate replacement work is performed. It is possible to provide a blackboard-replacement jig with excellent workability and reliability.
(2) Since the vertical fixing hole is drilled in the vertical fixing part and the vertical positioning hole is drilled in the vertical support part, the height of the fixing part and the sliding guide part can be adjusted easily by the support fixing part. can be fixed Te, decomposition of the auxiliary support, workability which can be assembled easily, it is possible to provide an excellent blackboard bonded re jig handleability.
(3) The height of the fixed part and sliding guide part can be adjusted freely by the vertical fixing hole and the vertical positioning hole, so that if the powder catcher cannot be removed from the wall blackboard fixing board or the old blackboard Even if the lower end is displaced, the sliding guide can be easily aligned with the upper surface of the powder receiver or the lower end of the old blackboard, and it can reliably guide the blackboard holder to perform the replacement work. It is possible to provide a blackboard-replacement jig having excellent properties and versatility.

According to invention of Claim 6 , in addition to the effect of any one of Claims 1 thru | or 5 , it has the following effects.
(1) Since the blackboard placement portion is divided into a plurality of partial placement members in the longitudinal direction, and the adjacent partial placement members are detachably fixed by the coupling members via the connecting metal fittings, the partial placement can be easily performed. It is possible to provide a blackboard-replacement jig with excellent versatility and functionality that can connect and divide members and can perform replacement according to blackboards having different longitudinal dimensions.
(2) Since a plurality of partial mounting members are detachably fixed by a coupling member, it can be easily divided and can be easily transported and stored in a compact size. An excellent blackboard replacement jig can be provided.
(3) Since the connecting bracket for fixing the partial placement member with the coupling member is provided on the back surface of the partial placement member, there is no protrusion or step on the top surface of the blackboard placement portion, and the new blackboard is stable. Thus, it is possible to provide a blackboard-replacement jig excellent in reliability and workability that can be placed, magnetically attached and held.
(4) Since the elastic member is disposed between the connecting bracket and at least one of the left and right coupling members, the elastic member can be compressed and deformed between the coupling bracket and the coupling member. Since the blackboard placement part can be deformed so that it can be bent at the connection point between the two, even when the wall blackboard fixing board is curved, the blackboard placement part can be reliably pressed against the old blackboard, easily It is possible to provide a blackboard replacement jig excellent in versatility and workability capable of performing the replacement work.
(5) Since the coupling member has a coupling member that detachably fixes at least one of the left and right ends of the connection fitting to the partial placement member, only the right and left ends of the connection fitting are partially mounted by the coupling member. Workability that can be held so that the adjacent partial mounting members can be bent at the joint location only by bringing the other end of the coupling fitting into contact with the back surface of the partial mounting member. It is possible to provide a blackboard-replacement jig with excellent handleability.
(6) Even when the left and right ends of the connection fitting are fixed to the partial mounting member by the coupling member, the elastic member is disposed between the connection fitting and at least one of the left and right coupling members. Adjacent partial placement members can be deformed so that they can be bent at the joint location, so even if the wall blackboard fixed board is curved, the blackboard placement part can be reliably pressed against the old blackboard, easily It is possible to provide a blackboard replacement jig excellent in versatility and workability capable of performing the replacement work.

According to invention of Claim 7 , it has the following effects.
(1) Since the end support fixture fixing process can removably fix the end support fixture to the wall blackboard fixing substrate or the bottom of the powder receiver at both longitudinal positions of the new blackboard, It is possible to provide a highly reliable blackboard replacement method that can reliably support the blackboard holder in accordance with the size and replacement position of the blackboard.
(2) Since the writing surface of the new blackboard can be magnetized to a predetermined position on the upper surface of the blackboard mounting portion of the blackboard holder by the blackboard magnetic attachment process, the new blackboard can be securely held by the blackboard holder. It is possible to provide a blackboard replacement method excellent in reliability and workability that can be easily moved and replaced.
(3) By the blackboard holder mounting step, the end of the blackboard mounting portion facing the support leg of the blackboard holder can be mounted on the sliding guide portion of the end support and Because the placement part support process can support the blackboard placement part with the support leg part of the blackboard holder, the blackboard holder can be made independent and can be replaced by one person or a small number of people It is possible to provide a blackboard replacement method that is excellent in properties.
(4) Since the adhesive layer can be formed on the front surface of the old blackboard and / or the back surface of the new blackboard by the adhesive layer forming step, the blackboard mounting portion is rotated in the blackboard mounting portion rotating step, After sliding the blackboard placement part to the old blackboard side in the placement sliding process, you can simply and reliably replace the blackboard by simply pressing the new blackboard in the blackboard pressing process, and the center of the new blackboard It is possible to provide a blackboard pasting method excellent in reliability and workability capable of preventing the occurrence of air pockets.
(5) Since the end portion of the blackboard placement portion is placed on the sliding guide portion of the end support by the blackboard holder placement step, the blackboard placement portion in the blackboard placement portion rotation step It is possible to provide a blackboard replacement method excellent in workability that can easily push up the end portion of the support leg portion upward to make it stand upright on the sliding guide portion of the end portion support tool.
(6) Since the blackboard placement part can be slid to the old blackboard side by the blackboard placement part sliding step, it is excellent in workability that can press the new blackboard against the old blackboard on the entire blackboard placement part. A method of replacing the blackboard can be provided.
(7) To provide a blackboard replacement method that can reliably press a new blackboard by the blackboard pressing step, can be firmly bonded to an old blackboard, and can be prevented from peeling and has excellent durability. Can do.

According to invention of Claim 8 , in addition to the effect of Claim 7 , it has the following effects.
(1) Since one or more auxiliary supports are detachably fixed at any position in the longitudinal direction on the bottom surface of the wall blackboard fixing substrate or powder receiver by the auxiliary support mounting process, the large blackboard or curved wall blackboard is fixed. When replacing the blackboard on the board, it is possible to support key points in the longitudinal direction of the blackboard mounting part, and to reliably guide when the blackboard holder slides, excellent in reliability and versatility A method of replacing the blackboard can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
1A is a perspective view showing an end support and an auxiliary support of the blackboard replacement jig in the first embodiment, and FIG. 1B is a blackboard of the blackboard replacement jig in the first embodiment. It is a perspective view which shows a holder, FIG.1 (c) is an AA arrow directional view in FIG.1 (b).
In FIG. 1, 1a and 1b are used as a pair of left and right end supporters of the blackboard replacement jig in the first embodiment, and 2 is a new wall surface blackboard fixing substrate for replacing the blackboard or a bottom surface of the powder receiver Fixed portions of the end supporters 1a and 1b, which are detachably fixed at both ends in the longitudinal direction of the blackboard, 3 is a fixed portion mounting hole of the end support tools 1a and 1b formed in the fixed portion 2; 4 is a sliding guide portion of the end support 1a, 1b extending to the fixed portion 3, and 5a, 5b is erected at one of the left and right ends of the slide guide 4 of the end support 1a, 1b. The side surface positioning unit 6 is an auxiliary support for the blackboard replacement jig in the first embodiment, and 7 is a wall blackboard fixing substrate for replacing the blackboard or a bottom surface of the powder receiver at an arbitrary position in the longitudinal direction of the new blackboard. A fixed part of the auxiliary support 6 that is detachably fixed, 8 is a plurality of auxiliary holes drilled in the fixed part 7 A fixing part mounting hole of the holding tool 6, 9 is a sliding guide part of the auxiliary support tool 6 extending to the fixing part 7, 10 is a blackboard holder of the blackboard replacement jig in the first embodiment, and 11 is a substantially rectangular shape. It has a plurality of partial placement members 11 a formed in a frame shape and divided in the longitudinal direction, and one end portion is placed on the end guides 1 a and 1 b and the sliding guide parts 4 and 9 of the auxiliary support 6. A blackboard placement section, 12 is a plurality of magnets arranged at predetermined positions on the upper surface of the blackboard placement section 11, and magnetizes the writing surface of the new blackboard, and 13 is a hinge at both ends and substantially the center of the blackboard placement section 11, respectively. A support leg portion pivotally supported by a support leg shaft support portion 13a, such as 13b, a tubular portion of the support leg portion 13, 13c, a slide leg portion slidably inserted into the tubular portion 13b, and 13d, A hook-like support leg locking member 13e rotatably arranged on the support leg 13 is a partial placement member 11a. Locking protrusions that are disposed on the side and lock the support leg locking member 13d when the support leg 13 is folded, and 14 is a support leg such as a screw for fixing the tubular portion 13b and the sliding leg 13c. The fixing portion 15 is a connecting metal fitting provided on the back surface on the contact side between the partial mounting members 11a, 11a adjacent to each other, and 15a is formed in both ends of the connecting metal 15 in a substantially circular shape or a long hole shape, respectively. The connecting hole 15b is an engaging part formed by bending one end of the connecting metal 15 to the upper surface side of the blackboard mounting part 11, and 16 is inserted into the connecting holes 15a and 15a at both ends, respectively. A coupling member such as a screw that is screwed to the mounting members 11 a and 11 a and is detachably fixed. 17 is a polyurethane resin or a soft material disposed between the coupling metal 15 and one coupling member 16 via a holding metal 18. It is an elastic member such as synthetic rubber.

The end supporters 1a and 1b and the auxiliary supporter 6 were made of a lightweight material having mechanical strength such as aluminum or aluminum alloy. Thereby, the handleability and durability are improved.
Two or more of the fixing portions mounting holes 3 and 8 of the end support tools 1a and 1b and the auxiliary support tool 6 are formed in the longitudinal direction of the wall blackboard fixing board for replacing the blackboard. Accordingly, the fixing portions 2 and 7 can be firmly fixed to the wall blackboard fixing substrate or the powder receiver with screws, and when the blackboard holder 10 is slid on the sliding guide portions 4 and 9, the end support 1a, The blackboard holder 10 can be reliably supported and guided without rotating the 1b and the auxiliary support 6. When the surface of the wall blackboard fixed substrate is curved, the fixing portions mounting holes 3 of the end supports 1a and 1b are inclined with respect to the longitudinal direction of the wall blackboard fixed substrate so as to follow the curved surface of the wall blackboard fixed substrate. You may arrange | position and arrange in circular arc shape, and can fix the edge part support tools 1a and 1b to a wall-surface blackboard fixed board | substrate or powder receiver reliably.
Further, when the fixing portion mounting holes 3 and 8 are formed in a long hole shape parallel to or perpendicular to the longitudinal direction of the wall blackboard fixing substrate, the mounting positions of the end support tools 1a and 1b and the auxiliary support tool 6 are set to the left and right or front and rear. It can be easily adjusted in the direction and has excellent workability.
The length of the sliding guide 9 of the auxiliary support 6 was formed longer than the length of the sliding guide 4 of the end supports 1a and 1b. Thereby, when replacing a blackboard with respect to the curved wall surface blackboard fixed board | substrate, important parts, such as the center part of the longitudinal direction of the blackboard mounting part 11, can be supported reliably, and it is excellent in workability.

The blackboard mounting portion 11 of the blackboard holder 10 was made of a lightweight and mechanical material such as aluminum or wood. Thereby, durability and workability | operativity at the time of conveyance are improved. Moreover, since the blackboard placement part 11 is formed in a frame shape, it is lighter and has better handleability. When one or a plurality of horizontal bars and vertical bars are arranged inside the frame of the blackboard mounting part 11, the blackboard mounting part 11 can be reinforced to prevent deformation and breakage. Moreover, a hand can be put on a horizontal crosspiece or a vertical crosspiece, and transportability and handling can be further improved. In particular, when a horizontal beam or a vertical beam is attached by screwing or fitting, it can be detached and attached as necessary during conveyance or re-pasting work, thereby improving handling and workability. The blackboard placement portion 11 may be formed in a plate shape to improve the strength. In this case, a horizontal beam or a vertical beam can be provided on the back surface of the blackboard placement unit 11 to improve the transportability and handling property.
The size of the blackboard mounting portion 11 was formed to be slightly smaller than the size of the wall blackboard fixed substrate. Thereby, the dimensional error of the wall blackboard fixing board can be absorbed, and when the new blackboard is pressed against the surface of the old blackboard by the blackboard mounting part 11, the blackboard on the outer periphery of the blackboard mounting part 11 and the wall blackboard fixing board The holding frame does not interfere, and the positioning reliability is excellent.

Since the length of the general blackboard in the longitudinal direction is formed to be an integral multiple of 900 mm, the partial mounting member 11 a corresponding to 900 mm and 1800 mm is prepared, and by combining them, 2700 mm, 3600 mm, or A blackboard placement portion 11 that can accommodate a larger size was formed.
In addition, by increasing the number of divisions of the blackboard placement portion 11 and shortening the longitudinal dimension of the partial placement member 11a, the blackboard can be reliably and efficiently replaced on the curved wall blackboard fixing substrate. Excellent workability. Moreover, you may form the partial mounting member 11a so that expansion-contraction is possible in a longitudinal direction. Thereby, the length can be adjusted and used even for a blackboard having a size outside the standard, and versatility can be further improved.

At least one support leg 13 is arranged in the longitudinal direction of each partial placement member 11a. Thereby, when the some partial mounting member 11a is connected, the blackboard mounting part 11 can be supported by the support leg part 13 of each partial mounting member 11a.
Since the support leg 13 has a support leg locking member 13d rotatably disposed, when the support leg 13 is folded, the support leg locking member 13d is locked and fixed to the locking projection 13e. can do. Thereby, the support leg part 13 does not get in the way when the blackboard holder 10 is pressed against the old blackboard at the time of the replacement work or at the time of transportation, and the workability and the handleability can be improved. When the support leg shaft support 13a is provided with a stopper mechanism instead of the support leg locking member 13d and the locking projection 13e, the support leg 13 can be fixed not only when folded but also when standing. The support leg 13 can be prevented from rotating during transportation, and is excellent in safety and handling.
The tubular portion 13b of the support leg 13 was formed of a round or square pipe made of metal such as aluminum. Thereby, the tubular part 13b can be reduced in weight and strength can be ensured. The sliding leg 13c is made of metal or wood similar to the supporting leg 13. When the sliding leg portion 13c is made of wood, it is lightweight and excellent in cost performance and workability.
The support leg fixing part 14 such as a screw or a pin is screwed or inserted into the side part of the tubular part 13b, and its end part is screwed, engaged or fitted to the side part of the sliding leg part 13c, The tubular portion 13b and the sliding leg portion 13c are fixed. Height adjustment can be easily performed by previously forming a plurality of female screw portions, engaging concave portions, and fitting holes in the longitudinal direction of the side portion of the sliding leg portion 13c.
When the sliding leg 13c is made of wood, it can be screwed with a support leg fixing part 14 such as a screw at any position without any special processing, and fine adjustment of the height is easy. Excellent workability and versatility.

The connection fitting 15 is provided with a connection hole 15a having a substantially circular shape or a long hole shape at both ends, and is screwed by a connecting member 16 such as a screw. Adjacent ones of the metal fittings 15 are arranged adjacent to each other by abutting and engaging the engaging portions 15b formed at one end on the side where the elastic member 17 is not disposed with the inner peripheral surface of the partial mounting member 11a formed in a frame shape. The positional displacement and rotation between the partial placement members 11a and 11a are reduced.
If one of the coupling holes 15a at both ends is opened and formed in a notch shape without forming the locking portion 15b, the coupling member 15 is slid or rotated by just loosening the coupling member 16 slightly. The connection can be easily broken and divided into a plurality of partial placement members 11a, and the workability is excellent.
As the elastic member 17, an elastic body such as a coil spring can be used in addition to polyurethane resin and soft synthetic rubber. A presser fitting 18 is disposed between the elastic member 17 and the coupling member 16. Thereby, the elastic member 17 can be reliably compressed and elastically deformed, and the blackboard mounting portion 11 can be easily deformed so as to be bent (refracted) at the joint portion between the partial mounting members 11a and 11a. Therefore, the blackboard can be easily and reliably positioned on the curved wall blackboard fixing substrate.

The blackboard replacement method using the blackboard replacement jig of Embodiment 1 formed as described above will be described with reference to the drawings.
2A is a perspective view showing a state in which the end support and the auxiliary support are attached to the blackboard holding frame, and FIG. 2B is a view in which the end support and the auxiliary support are attached to the blackboard holding frame. FIG. 3 is a perspective view showing a state in which the blackboard holder is placed, and FIG. 4 is a perspective view showing an upright state of the blackboard holder.
In FIG. 2, reference numeral 50 denotes an aluminum or wooden blackboard holding frame disposed on the outer periphery of the wall blackboard fixing substrate 51, 51 a denotes a bottom surface of the wall blackboard fixing substrate 51, and 52 denotes a surface fixed to the wall blackboard fixing substrate 51. An old blackboard 53 is a fixing screw for detachably fixing the end supporters 1a and 1b and the auxiliary supporter 6 to the bottom surface 51a of the wall blackboard fixing substrate 51.

First, as shown in FIG. 2, in the end support attaching step, the fixing portions 2 of the end supports 1 a and 1 b are pressed against the bottom surface 51 a of the wall blackboard fixing substrate 51, and the fixing screws 53 are fixed in the fixing portion attaching holes 3. To fix.
In this embodiment, since the entire surface of the old blackboard 52 is replaced, the end supporters 1a and 1b are fixed to both end positions of the wall blackboard fixing substrate 51. The mounting position of the support tools 1a and 1b is changed. At this time, when the left and right positioning steps by the side surface positioning parts 5a and 5b are provided, both end positions in the longitudinal direction of the new blackboard can be easily positioned according to the repositioning position, and the workability is excellent.
Next, in the auxiliary support attaching step, the fixing portion 7 of the auxiliary support 6 is pressed against the bottom surface 51 a of the wall blackboard fixing substrate 51, and the fixing portion attaching hole 8 is fixed with the fixing screw 53. An arbitrary number of auxiliary supports 6 are attached at arbitrary positions in the longitudinal direction of the wall blackboard fixing substrate 51 according to the width of the new blackboard and the repositioning position. In addition, when the width | variety of a new blackboard is short and the blackboard holder 10 can be supported only by the edge part support tools 1a and 1b, the auxiliary | assistant support tool 6 does not need to be attached.

Next, as shown in FIG. 3, in the blackboard holder mounting step, the end portion of the blackboard mounting portion 11 facing the support leg portion 13 of the blackboard holder 10 is used as the sliding guide portion of the end support tools 1a and 1b. 4 and the auxiliary support 6 are placed on the sliding guide portion 9 and, in the blackboard placement portion support step, the blackboard placement portion 11 is supported by the support legs 13 of the blackboard holder 10, and the blackboard holder 10. Make them independent. At this time, the position of the sliding leg 13c slidably inserted into the tubular part 13b of the support leg 13 is adjusted, and the entire length of the support leg 13 is changed and fixed by the support leg fixing part 14. By having the support leg height adjusting step, the blackboard holder 10 can be stably supported substantially horizontally in accordance with the mounting height of the end supports 1a, 1b and the auxiliary support 6.
Thereafter, in the blackboard magnetizing step, the writing surface of the new blackboard 54 is magnetically attached to the predetermined position on the upper surface of the blackboard mounting portion 11 of the blackboard holder 10 by the magnet 12.
Further, in the adhesive layer forming step, an adhesive layer is formed on the front surface (writing surface) of the old blackboard 52 and / or the back surface of the new blackboard 54. The adhesive layer was formed by applying an acrylic ester-based high-concentration aqueous adhesive / adhesive directly by brush coating or hand roller, or by transferring it from a release paper. When bonding is performed using an adhesive / adhesive, the old blackboard 52 can be peeled off and replaced with a new blackboard 54 at the time of the next replacement work, and the old blackboard 52 can be recycled. In addition, the adhesive layer can also be formed by spraying an adhesive with a spray or attaching a double-sided tape.
In addition, when forming an adhesive layer on the surface of the old blackboard 52, the adhesive layer forming step may be performed before the blackboard holder mounting step. Thereby, the blackboard holder 10 does not get in the way and is excellent in workability.

Next, as shown in FIG. 4, in the blackboard placement portion rotating step, the end portion on the support leg portion 13 side of the blackboard placement portion 11 is pushed upward to move the blackboard placement portion 11 to the end support tools 1 a and 1 b. The back surface of the new blackboard 54 and the front surface of the old blackboard 52 are made to face each other on the sliding guide portion 4 and the sliding guide portion 9 of the auxiliary support 6.
Thereafter, in the blackboard placement portion sliding step, the blackboard placement portion 11 is slid toward the old blackboard 52 and the new blackboard 54 is pressed against the surface of the old blackboard 52. At this time, the support leg portion 13a is rotated by the support leg shaft support portion 13a and folded to the back side of the blackboard placement portion 11, and the support leg locking member 13d is locked to the locking projection 13e to support the leg portion. 13 can be fixed. Thereby, when pressing the blackboard holder 10 against the old blackboard at the time of the replacement work, the support leg 13 does not get in the way and the workability is excellent.
Finally, in the blackboard pressing step, the surface of the new blackboard 54 is pressed to every corner with a pressing device such as a roller, and the adhesion of the new blackboard 54 is completed.
The blackboard pressing step can be performed without removing the blackboard holder 10 from the new blackboard 54 when the blackboard placement portion 11 is formed in a frame shape. In addition, since the new blackboard 54 is temporarily bonded by the blackboard placement portion sliding step, the blackboard pressing step can be performed after the blackboard holder 10 is removed.
After the replacement work is completed, the end supporters 1a and 1b and the auxiliary supporter 6 can be removed and collected, so that they can be used repeatedly and are excellent in resource saving.

In this embodiment, all the steps are performed at one place. However, there is not enough space in front of the wall blackboard fixing substrate 51, and the end of the blackboard holder 10 is connected to the end supports 1a and 1b and the auxiliary. If the blackboard placement part 11 cannot be supported by being placed on the support 6, the end support 1 a, 1 b and the end support 1 a, 1 b and the auxiliary support attachment process are carried out before the blackboard holder 10 is carried in. Only the auxiliary support 6 is disposed and fixed, and an adhesive layer forming step is performed. The blackboard magnetic attachment process is performed in another place, and the blackboard holder 10 is carried in an upright state. As shown in FIG. 4, the blackboard holder 10 is brought upright on the end supporters 1a and 1b and the auxiliary supporter 6. It can be performed from the blackboard placement portion sliding step.
In addition, when a presser edge is provided on the outer periphery of the surface of the old blackboard 52, the presser edge is removed in advance and then replaced, and the presser edge is returned to the original position after the replacement work is completed.
Furthermore, when the old blackboard 52 can be peeled off, the peeling step is performed before the end support attaching step. A peeling process has a blackboard peeling process and a wall surface blackboard fixed board | substrate cleaning process. After the old blackboard 52 is peeled off in the blackboard peeling step, dust and adhesive layers adhering to the surface of the wall blackboard fixed substrate 51 are removed in the wall blackboard fixed substrate cleaning step. When the adhesive layer is formed of a sticky / adhesive, it can be removed with a solvent that dissolves the sticky / adhesive. By cleaning the surface of the wall blackboard fixed substrate 51, the wall blackboard fixed substrate 51 and the new blackboard 54 can be firmly bonded, and the durability of the adhesive layer is excellent.

As described above, the blackboard pasting jig according to Embodiment 1 has the following effects.
(1) End support tools 1a and 1b that are detachably fixed to the bottom surface 51a of the wall blackboard fixing substrate 51, and a blackboard support that holds a new blackboard 54 and has the end portions placed on the end support tools 1a and 1b. Since the tool 10 is formed separately, it can be used in combination with different types of end support tools 1a, 1b and the blackboard holder 10 according to the size and shape of the new blackboard 54, and has excellent versatility, Only the small and lightweight end supports 1a and 1b can be independently positioned and fixed on the bottom surface 51a of the wall blackboard fixing substrate 51 independently, and the workability is excellent.
(2) Since the end supports 1 a and 1 b have the fixing portion 2, they can be easily attached to and detached from the bottom surface 51 a of the wall blackboard fixing substrate 51.
(3) Since the end supporters 1a and 1b have the sliding guide part 4 extended to the fixed part 2, the end part of the blackboard holder 10 can be placed, and the blackboard holder 10 can be easily attached. The blackboard holder 10 can be slid along the sliding guide portion 4 and pressed against the old blackboard 52 fixed on the surface of the wall blackboard fixing substrate 51. be able to.
(4) Since the blackboard placement portion 11 of the blackboard holder 10 is formed in a substantially rectangular plate shape or a substantially rectangular frame shape, a new blackboard 54 can be stably formed by selecting dimensions according to the new blackboard 54. In addition to being able to support, when pressing the new blackboard 54 against the surface of the old blackboard 52, it is possible to reliably press the entire surface or the four sides of the outer periphery.
(5) Since the magnet 12 for magnetizing the writing surface of the new blackboard 54 is provided at a predetermined position on the upper surface of the blackboard placement portion 11, the new blackboard 54 can be securely held, and the blackboard holder 10 is rotated. The position of the new blackboard 54 is not shifted when sliding or sliding, and can be positioned and replaced with high accuracy.
(6) Since the end supporters 1a and 1b and the blackboard holder 10 are formed separately and the magnet 12 for magnetically attaching the new blackboard 54 to the blackboard holder 10 is disposed, If there is not enough space, the attachment of the end supports 1a and 1b and the magnetic attachment of the new blackboard 54 to the blackboard holder 10 can be performed in another place. In this case, the position of the new blackboard 54 is not displaced, and the replacement work can be performed.
(7) Since two or more support leg portions 13 are arranged in the longitudinal direction of one end portion of the blackboard placement portion 11, the other end portion of the blackboard placement portion 11 facing the support leg portion 13 is used as an end support. When placed on 1a and 1b, the blackboard holder 10 can be self-supporting, and can be replaced by one person or a small number of people.
(8) Since the end support tools 1a and 1b can be independently fixed at an arbitrary position on the bottom surface 51a of the wall blackboard fixing substrate 51, it is necessary to replace a blackboard having two or more blackboards arranged side by side. You can select only a blackboard and replace it.
(9) By forming each part of the blackboard holder 10 with a lightweight and mechanical material such as aluminum or wood, workability during transportation can be improved. In particular, when the blackboard placing portion 11 is formed in a frame shape, it is lighter and has excellent transportability and handling properties.
(10) By forming the size of the blackboard mounting portion 11 slightly smaller than the size of the wall blackboard fixed substrate 51, the size error of the wall blackboard fixed substrate 51 can be absorbed. When the new blackboard 54 is pressed against the surface of the old blackboard 52, the blackboard placement portion 11 and the blackboard holding frame 50 on the outer periphery of the wall blackboard fixing substrate 51 do not interfere with each other, and positioning reliability is excellent.
(11) A blackboard for a large blackboard or a curved wall blackboard fixing substrate 51 by having at least one auxiliary support 6 that is detachably fixed at an arbitrary position in the longitudinal direction on the bottom surface 51a of the wall blackboard fixing substrate 51. Can be supported in the longitudinal direction of the blackboard mounting portion 11 and can be reliably guided when the blackboard holder 10 slides.
(12) Since the auxiliary support 6 has the fixing portion 7, it can be easily attached to and detached from the bottom surface 51 a of the wall blackboard fixing substrate 51.
(13) Since the auxiliary support 6 has the sliding guide part 9 extended to the fixed part 7, the end part of the blackboard holder 10 can be placed, and the blackboard holder 10 upright can be securely placed. The blackboard holder 10 can be slid along the sliding guide portion 9 and pressed against the surface of the old blackboard 52.
(14) The length of the sliding guide 9 of the auxiliary support 6 is made longer than the length of the sliding guide 4 of the end supports 1a and 1b, so that the curved wall blackboard fixing substrate 51 is not bent. When replacing the blackboard, it is possible to reliably support important points such as the central portion in the longitudinal direction of the blackboard placement portion 11 and excellent workability.
(15) Since the fixing portions mounting holes 3 and 8 are formed in the fixing portions 2 and 7 of the end support devices 1a and 1b and the auxiliary support device 6, they can be easily fixed by screwing and are detachable. Excellent in properties.
(16) Since the sliding guide portion 4 of the end support tools 1a and 1b and the sliding guide portion 9 of the auxiliary support tool 6 are formed to extend to the fixing portions 2 and 7, the fixing portions 2 and 7 are formed. And the sliding guide portions 4 and 9 can be integrally formed, and the number of parts is small and the productivity is excellent.
(17) The fixing portions 2 and 7 and the sliding guide portions 4 and 9 of the end support 1a and 1b are integrally formed, so that the fixing portions 2 and 7 and the sliding guide portions 4 and 9 are fixed. No fixing means or positioning work is required, and the blackboard holder 10 can be reliably supported and guided by the sliding guide portions 4 and 9 simply by positioning and fixing the fixing portions 2 and 7.
(18) Since the sliding guide portions 4 and 9 are extended to the fixing portions 2 and 7 and protrude in the horizontal direction in front of the wall-surface blackboard fixing substrate 51, they are directly on the bottom surface 51a of the wall-surface blackboard fixing substrate 51. The blackboard holder 10 can be supported and guided by being attached.
(19) By fixing two or more fixing portion mounting holes 3 and 8 in the longitudinal direction of the wall blackboard fixing substrate 51, the fixing portions 2 and 7 can be firmly fixed, and the blackboard is held on the sliding guide portions 4 and 9. When the tool 10 is slid, the end support tools 1a and 1b and the auxiliary support tool 6 do not rotate, and the blackboard holder 10 can be reliably supported and guided.
(20) Since the side surface positioning parts 5a and 5b are erected on one of the left and right ends of the sliding guide part 4 of the end support 1a and 1b, both ends of the blackboard placement part 11 of the blackboard holder 10 The blackboard holder 10 can be slid on the sliding guide portions 4 and 9 without causing a positional shift in the left-right direction.
(21) Since the side surface positioning portions 5a and 5b are erected at the end portions of the sliding guide portions 4 of the end support tools 1a and 1b, the upper surface of the fixing portion 2 is brought into contact with the bottom surface 51a of the wall blackboard fixing substrate 51. In the state of contact, the end surfaces of the side positioning parts 5a and 5b can be pressed against the surface of the old blackboard 52, and positioning can be easily performed at an arbitrary position in the longitudinal direction of the wall blackboard fixing board 51. The end support tools 1a and 1b can be attached to each other.
(22) Since the blackboard placement portion 11 is divided into a plurality of partial placement members 11a in the longitudinal direction, and the adjacent partial placement members 11a are detachably fixed by the coupling member 16 via the coupling metal 15, The partial placement member 11a can be easily connected and divided, and can be replaced corresponding to blackboards having different dimensions in the longitudinal direction.
(23) Since the plurality of partial placement members 11a are detachably fixed by the coupling member, they can be easily divided and can be made compact and easily transported and stored.
(24) Since the connecting fitting 15 for fixing the partial placement member 11 with the coupling member 16 is provided on the back surface of the partial placement member 11a, there is no protrusion or step on the upper surface of the blackboard placement portion 11. The new blackboard 54 can be stably placed and held magnetically.
(25) Since the elastic member 17 is disposed between the connection fitting 15 and at least one of the left and right coupling members 16, the elastic member can be compressed and deformed between the connection fitting 15 and the coupling member 16. Further, since the blackboard mounting portion 11 can be bent so as to be bent at the joint portion between the partial mounting members 11a, the blackboard mounting portion 11 is surely attached to the old blackboard even when the wall blackboard fixing substrate 51 is curved. 52, and can be easily replaced.
(26) Support leg portions 13 support each of the plurality of partial placement members 11a connected by disposing the support leg portions 13 in at least one place in the longitudinal direction of each partial placement member 11a. Can do.
(27) By providing the support leg shaft support portion 13a for pivotally supporting the support leg portion 13 with respect to the blackboard placement portion 11, the support leg portion 13 can be folded when transported or not used, and transported. Excellent space saving when storing.
(28) Since the support leg portion 13a can be rotated by the support leg shaft support portion 13a and folded on the back surface side of the blackboard placement portion 11, when the blackboard holder 10 is pressed against the old blackboard 52 at the time of replacement work, The support leg 13 does not get in the way, and workability can be improved.
(29) Since the support leg 13 has the support leg fixing part 14 for fixing the slide leg 13c slidably inserted into the tubular part 13b, by adjusting the position of the slide leg 13c, The length of the entire support leg 13 can be freely changed, and the blackboard holder 10 is stably supported substantially horizontally according to the mounting height of the end supporters 1a and 1b and the auxiliary supporter 6. Can do.
(30) Since the support leg 13 has a simple configuration in which the slide leg 13c is inserted into the tubular part 13b and is slid, the number of parts is small, the weight is light, and the blackboard holder 10 is easily carried. Can do.
(31) When the support leg 13 is folded, the support leg locking member 13d can be locked to the locking projection 13e to fix the support leg 13 and the blackboard holder 10 is old during the replacement work. At the time of pressing against the blackboard or during transportation, the support leg portion 13 does not get in the way, and the workability and handleability can be improved.
(32) Adjacent partial placement members 11a by engaging the engagement portions 15b formed at one end of the coupling metal 15 with the inner peripheral surface of the partial placement member 11a formed in a frame shape, It is possible to reduce misalignment and rotation between the members 11a, and to perform positioning and repositioning with high accuracy.

As described above, the blackboard replacement method using the blackboard replacement jig in the first embodiment has the following effects.
(33) The fixing portions 2 of the end support 1a and 1b can be detachably fixed to the bottom surface 51a of the wall blackboard fixing substrate 51 at both end positions in the longitudinal direction of the new blackboard 54 by the end support mounting step. As a result, the blackboard holder 10 can be reliably supported in accordance with the dimensions and repositioning positions of the new blackboard 54.
(34) By the blackboard holder mounting step, the end of the blackboard mounting portion 11 facing the support leg portion 13 of the blackboard holder 10 is mounted on the sliding guide portion 4 of the end support 1a, 1b. In addition, since the blackboard placement part 11 can be supported by the support leg part 13 of the blackboard holder 10 in the blackboard placement part support step, the blackboard holder 10 can be made independent, Can be replaced by the number of people.
(35) Since the writing surface of the new blackboard 54 can be magnetically attached to a predetermined position on the upper surface of the blackboard mounting portion 11 of the blackboard holder 10 by the blackboard magnetic attachment process, the new blackboard 54 is surely attached by the blackboard holder 10. Can be held and can be easily moved and pasted.
(36) Since the adhesive layer can be formed on the front surface of the old blackboard 52 and / or the back surface of the new blackboard 54 by the adhesive layer forming step, the blackboard mounting portion 11 is rotated in the blackboard mounting portion rotating step. After the blackboard placement part 11 is slid to the old blackboard 52 side in the blackboard placement part sliding process, the new blackboard 54 is simply and reliably replaced by simply pressing the new blackboard 54 against the old blackboard 52 in the blackboard pressing process. It is possible to prevent air from being collected at the center of the new blackboard 54.
(37) Since the end portion of the blackboard placement portion 11 is placed on the sliding guide portion 4 of the end support 1a, 1b by the blackboard holder placement step, in the blackboard placement portion rotation step The end portion of the support leg portion 13 of the blackboard placement portion 11 can be easily pushed upward to stand upright on the sliding guide portion 4 of the end portion support tools 1a and 1b.
(38) Since the blackboard placement portion 11 can be slid toward the old blackboard 52 by the blackboard placement portion sliding step, the new blackboard 54 can be pressed against the old blackboard 52 over the entire blackboard placement portion 11. it can.
(39) By the blackboard pressing step, the new blackboard 54 can be pressed reliably, can be firmly bonded to the old blackboard 52, and peeling can be prevented.
(40) When the end support attaching step includes the left and right positioning steps by the side positioning portions 5a and 5b, the replacement position of the blackboard can be easily positioned in advance by the side positioning portions 5a and 5b. In the placement portion rotation step and the blackboard placement portion sliding step, both ends of the blackboard placement portion 11 can be reliably guided to the repositioning position, and the repositioning can be performed accurately without causing a positional shift. Can do.
(41) In the blackboard pressing step, by pressing the surface of the new blackboard 54 to every corner with a pressing device such as a roller, reliable bonding can be performed, and the durability is excellent.
(42) Since one or more auxiliary supports 6 are detachably fixed at an arbitrary position in the longitudinal direction to the bottom surface 51a of the wall blackboard fixing substrate 51 by the auxiliary support mounting process, the large blackboard or the curved wall blackboard is fixed. When replacing the blackboard with respect to the substrate 51, it is possible to support important points in the longitudinal direction of the blackboard placement portion 11, and to reliably guide the blackboard holder 10 when it slides.

(Embodiment 2)
The blackboard pasting jig in Embodiment 2 of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the thing similar to Embodiment 1, and description is abbreviate | omitted.
FIG. 5A is a perspective view of a main part showing a state in which the blackboard replacement jig in the second embodiment is attached to the blackboard holding frame, and FIG. 5B is a diagram of the blackboard replacement jig in the second embodiment. It is a side view which shows the state attached to the blackboard holding frame.
In FIG. 5, the blackboard replacement jig in the second embodiment is different from the first embodiment in that the end support 21 of the blackboard replacement jig in the second embodiment is suspended from the end of the fixing portion 22. The vertical fixing portion 22a, the vertical fixing hole 22b drilled in the vertical fixing portion 22a, the vertical support portion 24a suspended from the end of the sliding guide portion 24, and the vertical support portion 24a. The vertical positioning hole 24b, and the vertical fixing hole 22b and the vertical positioning hole 24b are inserted into the vertical positioning hole 24b and have a support fixture fixing portion 53a such as a bolt and a nut for detachably fixing the fixing portion 22 and the sliding guide portion 24.

The vertical fixing hole 22b and the vertical positioning hole 24b were formed in a long hole shape. Thereby, the height of the fixed part 22 and the sliding guide part 24 can be easily adjusted, and the blackboard holder 10 can be guided regardless of the amount of positional deviation in the height direction between the wall blackboard fixed board 51 and the old blackboard 52. , Positioning accuracy is improved.
The both sides of the fixed portion 22 and / or the sliding guide portion 24 may be bent downward to form a substantially U-shaped cross section. As a result, the rigidity of the fixed portion 22 and / or the sliding guide portion 24 can be increased. In particular, when the end portion of the blackboard holder 10 is placed on the sliding guide portion 24 or the blackboard holder 10 is rotated. Thus, the fixed portion 22 and / or the sliding guide portion 24 can be prevented from being deformed by the weight of the blackboard holder 10 when the sliding guide portion 24 is made to stand upright, and the reliability is excellent.
As the end support 21 of the blackboard pasting jig in the second embodiment, the same one can be used on the left and right sides of the wall blackboard fixing substrate 51, which is excellent in productivity and workability.
The auxiliary support has the same configuration as that of the end support 21 and the blackboard holder 10 is the same as that of the first embodiment, so that the description thereof is omitted.

A blackboard replacement method using the blackboard replacement jig of Embodiment 2 formed as described above will be described with reference to the drawings.
The blackboard replacement method using the blackboard replacement jig of the second embodiment is different from that of the first embodiment in that the end support attaching step and the auxiliary support attaching step are sliding guide portions with respect to the fixed portion 22. 24, the height adjustment is performed by moving up and down 24, and a slide guide height adjustment step of fixing by the support fixture fixing portion 53a is provided.
Thereby, the sliding guide part 24 can be aligned with the lower end of the old blackboard 52 and can be accurately replaced. This is particularly suitable when the bottom surface 51a of the wall blackboard fixing substrate 51 and the lower end of the old blackboard 52 are shifted. In addition, even when the powder receiver disposed on the bottom surface 51a of the wall blackboard fixing substrate 51 cannot be removed, the reattaching operation can be performed by attaching the end support 21 and the auxiliary support to the bottom surface of the powder receiver. it can.

As described above, according to the blackboard pasting jig in the second embodiment, in addition to the operations in the first embodiment, the following operations are provided.
(1) The end support tool 21 and the auxiliary support tool have a vertical fixing part 22 a suspended from the end part of the fixing part 22 and a vertical support part 24 a suspended from the end part of the sliding guide part 24. Therefore, by bringing the vertical support portion 24a of the sliding guide portion 24 into contact with the vertical fixing portion 22a of the fixing portion 22, the sliding guide portion 24 can be guided by the fixing portion 22, and the sliding guide portion 24 is It can be held horizontally and can be replaced with high accuracy.
(2) Since the vertical fixing hole 22b is formed in the vertical fixing portion 22a and the vertical positioning hole 24b is formed in the vertical support portion 24a, the fixing portion 22 and the sliding guide portion can be easily formed by the support fixture fixing portion 53a. The height of 24 can be adjusted and fixed, and the end support 21 and the auxiliary support 21 can be easily disassembled and assembled.
(3) Since the vertical fixing hole 22b and the vertical positioning hole 24b can freely adjust the height of the fixing part 22 and the sliding guide part 24, the lower end of the wall blackboard fixing board 51 and the old blackboard 52 may be misaligned. Even if the powder holder cannot be removed from the wall blackboard fixing substrate 51, the sliding guide portion 24 can be easily aligned with the lower end of the old blackboard 52 or the upper surface of the powder receiver, and the blackboard holder 10 is reliably guided. And re-paste work can be performed.

As described above, according to the blackboard replacement method using the blackboard replacement jig in the second embodiment, in addition to the operation of the first embodiment, the following operation is provided.
(4) The height of the sliding guide 24 can be adjusted by moving the sliding guide 24 up and down with respect to the fixed portion 22 in the sliding guide height adjustment step. It can be repositioned with high accuracy by aligning with the upper surface of the receiver, and is excellent in reliability and versatility.

(Embodiment 3)
Hereinafter, the blackboard pasting jig according to Embodiment 3 of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the thing similar to Embodiment 1 thru | or Embodiment 2, and description is abbreviate | omitted.
FIG. 6A is a perspective view of a main part showing a state in which the blackboard replacement jig according to the third embodiment is attached to the blackboard holding frame, and FIG. 6B shows the blackboard replacement jig according to the third embodiment. It is a side view which shows the state attached to the blackboard holding frame.
In FIG. 6, the blackboard replacement jig in the third embodiment is different from the second embodiment in that the end support 31 of the blackboard replacement jig in the third embodiment attached to the right end of the wall blackboard fixing substrate 51. but has a side positioning portion 26 provided upright on the right end of the slide guide portion 24, the lower end surface 26a of the wall board fixed substrate 51 side of the side surface positioning portion 26 on the upper surface flush with the Kona受55 The end face 26b of the side positioning part 26 is formed so as to be flush with the surface of the old blackboard 52.
Note that the end support attached to the left end of the wall blackboard fixing substrate 51 is formed symmetrically with the same configuration as the end support 31 at the right end and will not be described.
In FIG. 6, 55 is a powder receiver disposed on the bottom surface 51 a of the wall blackboard fixing substrate 51, 55 a is a groove groove formed in parallel with the longitudinal direction of the powder receiver 55, 55 b is a bottom surface of the powder receiver 55, 56. Is a buried tree fitted in the groove 55a.

By forming the lower end surface 26a of the side surface positioning part 26 on the wall blackboard fixed substrate 51 side to be flush with the upper surface of the powder receiver 55, and forming the end surface 26b of the side surface positioning part 26 flush with the surface of the old blackboard 52, The fixing portion 22 can be fixed to the powder receiver 55 at an arbitrary position in the longitudinal direction of the wall blackboard fixing substrate 51. When replacing only a part of the old blackboard 52 in the longitudinal direction, the lower end surface 26a of the side surface positioning portion 26 on the wall blackboard fixing substrate 51 side is brought into contact with the upper surface of the powder receiver 55, and the end surface 26b of the side surface positioning portion 26 is old. Since it can be attached so as to abut against the surface of the blackboard 52, the blackboard holder 10 can be reliably slid and guided to the surface of the old blackboard 52 without causing a lateral displacement.
In the present embodiment, the side surface positioning portion 26 is integrally formed by bending the end portion of the sliding guide portion 24 upward, but another member may be fixed to the side portion of the sliding guide portion 24 by screwing or the like. Good. When the side surface positioning portion 26 is slidably fixed in the thickness direction of the wall surface blackboard fixing substrate 51 with respect to the sliding guide portion 24, even if the wall surface blackboard fixing substrate 51 has a different thickness, The end face 26b of the side positioning part 26 can be moved and fixed so as to abut against the surface of the old blackboard 54, and the blackboard holder 10 can be reliably slid and guided to the surface of the old blackboard 52.
Further, the side surface positioning part 26 may be formed or disposed on the fixing part 22. When the side positioning part 26 is provided on the fixing part 22, the guide surface can be fixed so as to abut against both end faces in the longitudinal direction of the blackboard holding frame 50 and the powder receiver 55. It can be suitably used at the time of replacement.

A blackboard replacement method using the blackboard replacement jig of Embodiment 3 formed as described above will be described with reference to the drawings.
In FIG. 6, the blackboard replacement method using the blackboard replacement jig of the third embodiment is different from that of the second embodiment in that powder receiving 55 And the end support 31 and the auxiliary support attached by the end support attaching process and the auxiliary support attaching process on the bottom surface 55b of the powder receiver 55. It is a point that is installed.
Thereby, even when the powder receiver 55 cannot be removed from the wall blackboard fixing substrate 51, the blackboard holder 10 can be reliably slid and guided to the surface of the old blackboard 52.

According to the blackboard pasting jig in the third embodiment, in addition to the operations in the second embodiment, the following operations are provided.
(1) Since the side surface positioning portion 26 is erected at either the left or right end portion of the sliding guide portion 24 of the end portion support tool 31, the both ends of the blackboard placement portion 11 of the blackboard holder 10 are securely attached. The blackboard holder 10 can be slid on the sliding guide portion 24 without causing a lateral displacement.
(2) By having the side surface positioning portion 26, the fixing portion 22 can be fixed to the powder receiver 55 at an arbitrary position in the longitudinal direction of the wall blackboard fixing substrate 51, and only a part of the old blackboard 52 in the longitudinal direction is fixed. It can be used suitably at the time of replacement.
(3) even when not be removed the Kona受55 from the wall board fixed substrate 51, by extending the side positioning portion 26 on the wall board toward the fixed substrate 51, the wall board fixed substrate 51 side of the side surface positioning portions 26 the lower end surface 26a Can be attached so that the end face 26b of the side surface positioning portion 26 abuts against the surface of the old blackboard 52, so that the blackboard holder 10 can be slid securely to the old blackboard 52. Can guide to the surface of

As described above, the blackboard pasting method using the blackboard pasting jig in the third embodiment has the following actions in addition to the actions of the second embodiment.
(4) Since the buried tree 56 is inserted into the groove 55a of the powder receiver 55 by the embedded tree insertion process as a pre-process of the end support attachment process and the auxiliary support attachment process, the step on the upper surface of the powder receiver 55 can be eliminated. The blackboard holder 10 can be reliably slid in the blackboard placement portion sliding step.

(Embodiment 4)
Hereinafter, the blackboard pasting jig according to Embodiment 4 of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the thing similar to Embodiment 1, and description is abbreviate | omitted.
FIG. 7A is a perspective view showing a blackboard holder of the blackboard replacement jig in Embodiment 4, and FIG. 7B is a view taken along the line B-B in FIG. 8 (a) is a bottom view showing the connecting bracket of the blackboard holder, and FIG. 8 (b) is a bottom view showing a modification of the connecting bracket of the blackboard holder.
7 and 8A, the blackboard replacement jig in the fourth embodiment is different from the first embodiment in that the blackboard placement portion 11a of the blackboard holder 10a of the blackboard replacement jig in the fourth embodiment. The auxiliary magnetized portion 11b having the auxiliary magnet 12a disposed on the front side of the shaft is pivotally disposed by a pivot shaft support portion 11c such as a hinge, and the support leg portion 13 is pivotally pivoted. The supporting leg shaft support portion 13a to be supported is disposed on the side portion of the tubular portion 13b on the wall blackboard fixing substrate 51 side, and the connection fittings 25a and 25b do not have the locking portion 15b, and the connection fittings 25a and 25b One end portion is detachably fixed to only one partial placement member 11a by the coupling member 16, and the connecting fittings 25a and 25b of the adjacent partial placement members 11a and 11a are arranged so as to contact each other. It is.

Two connecting fittings 25a and 25b are arranged on the adjacent partial mounting members 11a and 11a, respectively, so that the connecting fittings 25a and 25b are in contact with each other. In particular, since the two connection fittings 25a of the left partial placement member 11a are arranged so as to be in contact with each other inside the two connection fittings 25b of the right partial placement member 11a, the partial placement members 11a, 11a. Has excellent reliability without sliding up and down.
In the present embodiment, only one end of each of the connection fittings 25a and 25b is fixed to one partial placement member 11a by the coupling member 16, but both end portions of the connection fittings 25a and 25b are adjacent to each other. , 11a may be fixed. In particular, as described in the first embodiment, when there is not enough space in front of the wall blackboard fixing substrate 51, the blackboard magnetizing process is performed in another place, and the blackboard holder 10 is carried in a standing state, It is necessary to securely fix the mounting members 11a and 11a, and it is desirable to fix both end portions of the connection fittings 25a and 25b to the adjacent partial mounting members 11a and 11a, respectively.
The end supporter and the auxiliary supporter can be used in combination with any one of those used in the first to third embodiments, and thus description thereof is omitted.

A blackboard replacement method using the blackboard replacement jig of Embodiment 4 formed as described above will be described with reference to the drawings.
The blackboard replacement method using the blackboard replacement jig of the fourth embodiment is different from the first to third embodiments in that the blackboard magnetizing process positions the new blackboard 54 while temporarily fixing the new blackboard 54 with the magnet 12. And a blackboard fixing step in which after the positioning, the auxiliary magnetized portion 11b is rotated and the new blackboard 54 is firmly magnetized by the auxiliary magnet 12a.
By weakening the magnetic force of the magnets 12 disposed on the upper surface of the blackboard placement part 11a or reducing the number of magnets 12, the new blackboard 54 is strongly magnetically attached to the blackboard placement part 11a in the blackboard positioning process. Can be prevented and positioning can be performed easily. Thereafter, in the blackboard fixing step, the auxiliary magnetic adhesion part 11b can be rotated to strongly magnetically adhere the new blackboard 54. Therefore, in the blackboard placement part rotation process and the blackboard placement part sliding process in the subsequent process The replacement work can be performed without causing a position shift of the new blackboard 54, and the reliability and versatility are excellent.
In particular, when the new blackboard 54 is of a magnet type or the like, it can be prevented that the new blackboard 54 is firmly fixed to the magnet 12 and difficult to position, and can be suitably used.

Further, since the new blackboard 54 can be strongly magnetized by the auxiliary magnetized portion 11b, the blackboard holder 10 is placed upright on the sliding guide portions 4 and 9 even when the base of the old blackboard 52 is a magnet. At this time, it is possible to prevent the new blackboard 54 from being attracted by the magnetic force of the old blackboard 52 and causing a displacement.
The support leg shaft support portion 13a is disposed on the side portion of the tubular portion 13b on the wall blackboard fixing substrate 51 side, so that the support leg portion 13 side of the blackboard placement portion 11 in the blackboard placement portion rotating step. When the end portion is pushed up to bring the blackboard placement portion 11 upright on the slide guide portion 4 of the end support tools 1a and 1b and the slide guide portion 9 of the auxiliary support tool 6, the support leg 13 is Since it rotates by its own weight and automatically folds, man-hours can be reduced and workability can be improved.
In the present embodiment, one auxiliary magnetized portion 11b is provided on each blackboard mounting portion 11a, and one side in the longitudinal direction of the auxiliary magnetized portion 11b is pivotally supported by the pivot shaft supporting portion 11c. The location, the number, and the rotation direction of the auxiliary magnetized portion 11b are not limited to this.

Next, a modified example of the connecting metal fitting will be described.
In FIG. 8 (b), the modified example of the connecting metal is different from that of the fourth embodiment in that the connecting metal fitting 25a of the left partial mounting member 11a is attached to the right partial mounting member 11a so as to be sandwiched from both sides. The two connecting fittings 25b and 25b are provided. Thereby, it can prevent more reliably that the partial mounting members 11a and 11a slide up and down.
The two connecting brackets 25b and 25b may be integrally formed so as to be substantially U-shaped.

As described above, according to the blackboard pasting jig in the fourth embodiment, in addition to the functions in the first to third embodiments, the following actions are provided.
(1) By weakening the magnetic force of the magnets 12 or reducing the number thereof, the new blackboard 54 can be prevented from being strongly magnetically attached to the blackboard placement portion 11a in the blackboard positioning step, and positioning can be performed easily. In addition, in the blackboard fixing process, the auxiliary magnetized portion 11b can be rotated to strongly magnetically adhere the new blackboard 54, so that the blackboard placement portion rotating step and the blackboard placement portion sliding in the subsequent steps can be performed. The replacement work can be performed without causing a position shift of the new blackboard 54 in the process, and the reliability and versatility are excellent.
(2) Since the new blackboard 54 can be strongly magnetized by the auxiliary magnetized portion 11b, the blackboard holder 10 is placed upright on the sliding guide portions 4 and 9 even when the base of the old blackboard 52 is a magnet. In this case, it is possible to prevent the new blackboard 54 from being attracted by the magnetic force of the old blackboard 52 to cause positional displacement, and the reliability and workability are excellent.
(3) Two or more connecting metal fittings 25a and 25b are disposed on the adjacent partial placement members 11a and 11a, respectively, and the connection metal fittings 25a and 25b of the adjacent partial placement members 11a and 11a are fixed in contact with each other. Thus, the partial placement members 11a and 11a can be prevented from sliding back and forth. In particular, when one connecting metal fitting 25a arranged on the other partial mounting member 11a is sandwiched between two connecting metal fittings 25b arranged on the one partial mounting member 11a, the partial mounting member 11a is more reliably provided. , 11a can be prevented from sliding back and forth, and the positioning reliability is excellent.

  The present invention relates to a blackboard replacement jig for repairing a blackboard with poor chalk riding and a blackboard replacement method using the same, and has a simple configuration with a small number of parts, low cost, and excellent productivity. Providing blackboard replacement jigs that are easy to disassemble and assemble, have excellent transportability, and are highly reliable and versatile so that blackboards with various dimensions can be accurately positioned and replaced. It provides a blackboard replacement method with excellent workability and productivity that can reliably replace the blackboard in a short time, and shortens the work period of the blackboard replacement work to improve reliability and durability. Can be improved.

(A) The perspective view which shows the edge part support tool and auxiliary support tool of the blackboard replacement jig in Embodiment 1 (b) The perspective view which shows the blackboard holder of the blackboard replacement jig in Embodiment 1 (c) AA arrow view in FIG. 1 (b) (A) The perspective view which shows the state which attached the edge part support tool and the auxiliary support tool to the blackboard holding frame (b) The side view which shows the state which attached the edge part support tool and the auxiliary support tool to the blackboard holding frame The perspective view which shows the mounting state of a blackboard holder Perspective view showing the upright state of the blackboard holder (A) Perspective view of main part showing a state in which the blackboard replacement jig in Embodiment 2 is attached to the blackboard holding frame (b) Shows a state in which the blackboard replacement jig in Embodiment 2 is attached to the blackboard holding frame Side view (A) The principal part perspective view which shows the state which attached the blackboard replacement jig in Embodiment 3 to the blackboard holding frame (b) The state which attached the blackboard replacement jig in Embodiment 3 to the blackboard holding frame is shown Side view (A) The perspective view which shows the blackboard holder of the blackboard replacement jig in Embodiment 4 (b) The BB arrow directional view in Fig.7 (a) (A) Bottom view showing the connecting bracket of the blackboard holder (b) Bottom view showing a modification of the connecting bracket of the blackboard holder

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b End part support tool of the blackboard replacement jig in Embodiment 1 2 Fixing part 3 Fixing part attachment hole 4 Sliding guide part 5a, 5b Side surface positioning part 6 Support of the blackboard replacement jig in Embodiment 1 Support fixture 7 Fixing portion 8 Fixing portion mounting hole 9 Sliding guide portion 10 Blackboard holder for blackboard replacement jig in Embodiment 1 10a Blackboard holder for blackboard replacement jig in Embodiment 11 11 Blackboard placement portion 11a Partial mounting member 11b Auxiliary magnetized portion 11c Rotating shaft support portion 12 Magnet 12a Auxiliary magnet 13 Support leg portion 13a Support leg shaft support portion 13b Tubular portion 13c Sliding leg portion 13d Support leg locking member 13e Locking protrusion 14 Support Leg fixing portion 15, 25a, 25b Connecting bracket 15a Connecting hole 15b Locking portion 16 Connecting member 17 Elastic member 18 Presser fitting 21 Blackboard replacement treatment according to the second embodiment End support tool 22 Fixing part 22a Vertical fixing part 22b Vertical fixing hole 24 Sliding guide part 24a Vertical support part 24b Vertical positioning hole 26 Side positioning part 26a Lower end face 26b End face 31 Blackboard replacement jig in the third embodiment End support tool 50 Blackboard holding frame 51 Wall blackboard fixing board 51a Bottom face 52 Old blackboard 53 Fixing screw 53a Support fixing part 54 New blackboard 55 Dust 55a Groove 55b Bottom face 56 Buried wood

Claims (8)

A blackboard replacement jig that replaces the old blackboard fixed on the surface of the wall blackboard fixing board,
a. A fixed portion that is detachably fixed at both end positions in the longitudinal direction of a new blackboard to the bottom surface of the powder receiver disposed at the lower end of the wall blackboard fixed substrate or the wall blackboard fixed substrate, and is drilled in the fixed portion. The fixing portion mounting hole, the vertical fixing portion suspended from the end of the fixing portion, the vertical fixing hole drilled in the vertical fixing portion, and the sliding having the vertical support portion suspended from the end A guide portion; a vertical positioning hole drilled in the vertical support portion; a support fixture fixing portion that is inserted through the vertical fixing hole and the vertical positioning hole and detachably fixes the fixing portion and the sliding guide portion; , and the end support having a
b. A blackboard placement portion formed in a substantially rectangular plate shape or a substantially rectangular frame shape and provided with a magnet for magnetizing the writing surface of the new blackboard at a predetermined position on the upper surface, and a longitudinal direction of one end portion of the blackboard placement portion Two or more support legs disposed on the blackboard placement part opposite to the support leg part, and the other end part of the support part is placed on the sliding guide part of the end support tool. With blackboard holders,
A blackboard-replacement jig characterized by comprising: 2. The blackboard replacement treatment according to claim 1, wherein the end support includes a side surface positioning portion erected on either the left or right end of the fixed portion or the sliding guide portion. Ingredients. A fixed part that is detachably fixed at an arbitrary position in the longitudinal direction to the bottom surface of the wall blackboard fixed substrate or a powder receiver disposed at a lower end of the wall blackboard fixed substrate, and an extended or detachable arrangement on the fixed part. The blackboard replacement jig according to claim 1, further comprising at least one auxiliary support having a sliding guide portion provided. The auxiliary support has a fixing portion mounting hole formed in the fixing portion, and the sliding guide portion of the auxiliary support extends to the fixing portion and is horizontally in front of the wall blackboard fixing substrate. The blackboard pasting jig according to claim 3 , wherein the blackboard pasting jig is formed to project in a direction. The auxiliary support includes a vertical fixing part suspended from an end of the fixing part, a fixing part mounting hole drilled in the fixing part, a vertical fixing hole drilled in the vertical fixing part, A vertical support portion suspended from an end of the sliding guide portion, a vertical positioning hole drilled in the vertical support portion, the vertical fixing hole and the vertical positioning hole, and the fixing portion and the slide The blackboard pasting jig according to claim 3 , further comprising a support fixture fixing portion that detachably fixes the movement guide portion. The blackboard placement portion of the blackboard holder is a plurality of partial placement members divided in the longitudinal direction, a connecting metal fitting provided on the back surface on the contact side between the adjacent partial placement members, A coupling member that detachably fixes at least one of the left and right ends of the coupling metal to the partial placement member; and an elastic member disposed between the coupling metal and at least one of the left and right coupling members; The blackboard replacement jig according to any one of claims 1 to 5 , wherein the blackboard replacement jig is provided. The bottom face of the powder receiver disposed on the lower end of the wall-surface blackboard fixing substrate or the wall-surface blackboard fixing substrate with the fixing portion of the end support of the blackboard-replacement jig according to any one of claims 1 to 6 An end support attaching step for detachably fixing the new blackboard at both ends in the longitudinal direction, and the end of the blackboard mounting portion facing the support leg of the blackboard holder is the end support. A blackboard holder mounting step of placing the blackboard holder on the sliding guide, a blackboard holder supporting step of supporting the blackboard mounting portion by the support legs of the blackboard holder, and the blackboard holder of the blackboard holder A blackboard magnetic adhesion process in which the writing surface of the new blackboard is magnetically adhered to the predetermined position on the upper surface of the blackboard placement portion by the magnet, and an adhesion layer is formed on the front surface of the old blackboard and / or the back surface of the new blackboard A layer forming step and an end of the blackboard placement portion on the support leg side. A blackboard placement portion rotating step for pushing the blackboard placement portion upright on the sliding guide portion of the end support and a blackboard placement for sliding the blackboard placement portion toward the old blackboard side A blackboard pasting method comprising: a partial sliding step; and a blackboard pressing step of pressing the new blackboard against the old blackboard. One or more auxiliary support members for the blackboard re- placement jig according to any one of claims 3 to 5, on the bottom surface of the powder receiver disposed on the wall blackboard fixed substrate or the lower end of the wall blackboard fixed substrate. The blackboard replacement method according to claim 7 , further comprising an auxiliary support attachment step of detachably fixing at an arbitrary position in the longitudinal direction.