JPH08187993A - Electronic blackboard - Google Patents

Abstract

PURPOSE: To prevent the falling-off of pulleys from the fixed positions of pulleys without damaging workability in the case of fixing one pulley on the position close to another pulley for the purpose of loosening a sheet when the work of fitting and removing the sheet disposed in tension between a couple of pulleys is carried out. CONSTITUTION: A fine neck section 29 having the width seen from the given direction to be narrower than its shaft width is formed on a shaft 13a of a pulley 13, and an inserting hole 30 for inserting through the fine neck section 29 forming a fine neck on the given position where the pulley 13 is set close to another pulley 13 and a retaining hole 31 of almost same diameter as the shaft 13a of the pulley 13 communicating with the inserting hole 30 are formed on an assembly frame. At the time of the work of fitting or removing a sheet, the fine neck section 29 is inserted into the inserting hole 30 on the assembly frame side and position on the retaining hole 31. The shaft 13a of the pulley 13 is rotated so that the fine neck section 29 forms an angle not to slip off the inserting hole 30 to fix the position of the pulley 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a part of an endless sheet member rotatably held as a writing surface, and the information written on the writing surface is optically transferred during the rolling process of the sheet member. The present invention relates to an electronic blackboard that is read by a user and outputs the read information.

[0002]

2. Description of the Related Art In recent years, electronic blackboards having a function of making a hard copy of the contents written on a writing surface have become widespread and are used for presentations at conferences, lectures, and the like.

A conventional example of such an electronic blackboard is shown in FIGS. 4 to 9. First, as shown in FIG. 4, the stand 1
The blackboard main body 2 supported by is provided. The blackboard main body 2 is formed by detachably attaching a board assembly 5 inside a main body frame 4 to which a frame cover 3 is detachably attached on the front surface (see FIGS. 5 and 6). The board assembly 5 has a sheet body 8 which is a writing surface 7 exposed to the outside from an opening 6 formed in the front surface of the blackboard body 2. The sheet body 8 is endlessly formed and is rotatably supported. Has been done. Further, the blackboard body 2 has a built-in reduction reading optical system and a control unit (not shown) for optically reading information written on the writing surface 7 as the sheet 8 rolls and the information written on the writing surface 7 moves. A printer 9 is attached for making a hard copy of the information read by the reduction optical system under the control of the control unit. Further, an operation panel 10 is attached near the printer 9.

Now, the board assembly 5 will be described in detail with reference to FIGS. As shown in FIG. 7, the board assembly 5 includes a sheet body 8 stretched on a pair of pulleys 13 rotatably attached to both sides of a rectangular frame-shaped assembly frame 12 to which a writing board 11 is attached. Has been formed. Writing board 11
Is formed of plywood or the like, and is arranged immediately behind the portion that becomes the writing surface 7 of the sheet body 8 to support the sheet body 8. The sheet body 8 is made of, for example, polyester or the like, and one pulley 13 is attached to the other pulley 1
It is stretched by being biased in a direction away from 3.

A supporting structure of the pulley 13 on the biased side will be described. First, the pulley 13 is attached to the assembly frame 12 via the movable frame 14. The movable frame 14 is slidable along the longitudinal direction of the assembly frame 12, and therefore the pair of pulleys 13 are supported so as to be able to approach and separate from each other. That is, as shown in FIGS. 8 and 9, the movable frame 14 has an elongated slot 1 elongated along the sliding direction thereof.
5 is formed, and an auxiliary plate 17 is attached to an end portion of the assembly frame 12 via a stepped rivet 16 that enters the elongated hole 15. Therefore, a gap corresponding to the stepped rivet 16 is formed between the assembly frame 12 and the auxiliary plate 17, and the movable frame 14 is slidably attached in the gap in the direction of the elongated hole 15. Then, a hook 14a is folded back at the end of the movable frame 14, and the auxiliary plate 17
A hook 17a is also formed by folding back at the end of the coil, and a coil-shaped tension spring 18 is stretched between the two hooks 14a and 17a. As a result, the movable frame 14 is urged toward the outside of the assembly frame 12, and therefore the pulley 13 supported by the movable frame 14 is urged.
Is urged in a direction away from the other pulley 13. Further, the end of the elongated hole 15 formed in the movable frame 14 is a hooking portion 15a bent at a right angle, and the stepped rivet 16 is hooked on the hooking portion 15a, so that the urging force of the tension spring 18 is increased. The movable frame 14 pushed in against is held in that position.

The one having such a structure has an operation panel 10
The sheet body 8 is driven based on the operation of, and the sheet body 8 rolls and moves in the left-right direction. At this time, it is also possible to read the information written on the writing surface 7 with the reduction optical system and make a hard copy with the printer 9 based on the operation of the operation panel 10.

On the other hand, the sheet body 8 may be detached from the board assembly 5 for maintenance or replacement of the sheet body 8. In this case, the frame cover 3 is removed from the body frame 4, and then the board assembly 5
Remove. Then, by pushing in the pulley 13 attached to the movable frame 14 to bring it closer to the other pulley 13 and moving it in the direction perpendicular to the pushing direction, the hooking portion 15a that communicates with the end of the long hole 15 of the movable frame 14 is formed.
Is hooked on one of the stepped rivets 16. This allows
The pair of pulleys 13 are supported at positions close to each other to loosen the sheet body 8, and the sheet body 8 can be easily attached to and detached from the board assembly 5.

[0008]

However, when one of the pulleys 13 is pushed in when the sheet body 8 is attached and detached,
In this pulley 13, the hook portion 15a of the movable frame 14 is merely hooked and supported by the stepped rivet 16. For this reason, there is a problem that the hooking portion 15a is easily dropped from the stepped rivet 16 and the position fixing of the pulley 13 is easily released. If the angle formed by the long hole 15 and the hooking portion 15a is formed to be an acute angle, the hooking portion 15a is less likely to fall off from the stepped rivet 16, but in this case, it becomes difficult to release the position fixing of the pulley 13 and workability is improved. Is damaged. As a result, the sheet body 8 may be damaged during the work, which is not desirable.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a shaft of a biased pulley is formed with a neck detail whose width when viewed from a predetermined direction is narrower than the shaft width, and the pulley is close to the other pulley. At the predetermined position, the assembly frame is provided with an insertion hole through which the neck details are inserted and a holding hole having a width substantially the same as the axial width of the pulley communicating with the insertion hole.

[0010]

Therefore, when attaching or detaching the sheet body,
Push in the pulley, insert the neck part formed on the shaft into the insertion hole on the assembly frame side and position it in the holding hole, and in this state rotate the pulley shaft so that the neck part is at an angle that does not come out of the insertion hole. . As a result, the shaft of the pulley is stably held in the holding hole, and the pulley is positionally fixed at a position close to the other pulley. Then, in order to return the pulley to the original position, the shaft of the pulley is rotated so that the neck details are at an angle to be removed from the insertion hole. As a result, the shaft of the pulley easily comes off from the holding hole and the insertion hole, and the pulley returns to its original position.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. The same parts as those shown in FIGS. 4 to 7 are designated by the same reference numerals, and the description thereof will be omitted.

The support structure of the pulley 13 on the biased side will be described. First, the pulley 13 is attached to the assembly frame 12 via the movable frame 21. The movable frame 21 is slidable along the longitudinal direction of the assembly frame 12, and therefore, the pair of pulleys 13 are supported so as to approach and separate from each other.

That is, a guide piece 22 and a guide hole 23 are formed in the end portion of the assembly frame 12 along the longitudinal direction thereof. The guide piece 22 is folded back at a right angle from the assembly frame 12, and the guide piece 22 has a recess 22a for hooking an end portion of a tension spring S described later. The guide piece 2 is attached to the movable frame 21 along the longitudinal direction thereof.
A guide hole 24 into which 2 is fitted is formed, and a guide piece 25 fitted into the guide hole 23 of the assembly frame 12 and a hook 27 having a recess 26 for hooking the end portion of the tension spring S are at right angles. It is formed by folding back. Here, the guide holes 23 and 24 are elongated along the longitudinal direction of the assembly frame 12, and wide ends 23a and 24a for inserting the guide pieces 22 and 25 are formed at one end thereof. And the other end has inclined portions 23b and 24b inclined with respect to the longitudinal direction.
Are formed. Therefore, the movable frame 21
Is the guide piece 2 on the assembly frame 12 side.
2 and the guide hole 23 and the guide piece 25 and the guide hole 24 on the movable frame 21 side are fitted to each other so as to be slidably attached to the assembly frame 12. When the movable frame 21 is attached to or detached from the assembly frame 12, the guide pieces 22, 25 are separated by the wide portions 23a, 24.
The size of each part is determined so that it can be inserted into the guide holes 23, 24 from a.

The recess 22a formed in the guide piece 22 on the assembly frame 12 side and the recess 2 formed in the hook 27 of the movable frame 21.
The tension spring S is stretched between 6 and 6. The shaft 13 a of the pulley 13 is rotatably attached to the end of the movable frame 21 via a bearing 28. As a result, the tension spring S contracts and pulls the hook 27 of the movable frame 21, whereby the movable frame 21 is urged toward the outside of the assembly frame 12, and thus is supported by the movable frame 14. The pulley 13 thus urged is urged in a direction away from the other pulley 13.

A neck detail 29 is formed on the shaft 13a of the pulley 13 attached to the movable frame 21. The neck detail 29 is a portion formed to have a width narrower than the width of the shaft 13a when viewed from a predetermined direction, and is formed by notching two outer peripheral surfaces of the shaft 13a. Further, an insertion hole 30 and a holding hole 31 are formed in the end portion of the assembly frame 12 at a portion facing the neck detail 29 formed on the shaft 13a of the pulley 13. The insertion hole 30 is formed to have a width that allows only the narrowed portion of the neck detail 29 to be inserted, and the holding hole 31 communicates with the insertion hole 30 and is substantially the same as the shaft 13a of the pulley 13. They have the same diameter.

In such a structure, when the sheet body 8 is attached to and detached from the board assembly 5, the frame cover 3 is removed from the main body frame 4 and then the board assembly 5 is removed, as described in the conventional technique. Then, the pulley 13 attached to the movable frame 21 is pushed in against the biasing force of the tension spring S and brought close to the other pulley 13, and the neck detail 29 formed on the shaft 13a of the pulley 13 is inserted through the assembly frame 12 side. 30 to be positioned in the holding hole 31, and in this state, the neck detail 29
The pulley 13 so that the angle does not come off from the insertion hole 30.
The shaft 13a of is rotated. As a result, the shaft 13a of the pulley 13 is stably held in the holding hole 31, and the pulley 13 is positionally fixed at a position close to the other pulley 13. Then, in order to return the pulley 13 to the original position, the pulley 1 is adjusted so that the neck detail 29 is at an angle to be removed from the insertion hole 30.
The shaft 13a of 3 is rotated. As a result, the shaft 13a of the pulley 13 easily comes off from the holding hole 31 and the insertion hole 30, and the pulley 13 returns to its original position by the urging force of the tension spring S.

Therefore, when fixing one pulley 13 at a position close to the other pulley 13 in order to loosen the sheet body 8, it is possible to reliably prevent the pulley 13 from dropping from the fixed position. Workability at that time is also good.

In the implementation, the neck details 29 are
It suffices that the width viewed from the predetermined direction is narrower than the width of the shaft 13a of the pulley 13, and the insertion hole 30 and the holding hole 31 have any shape as long as the pulley 13 can be inserted and held. It may have any shape. Further, in this embodiment, one pulley 13 is slidably attached to the assembly frame 12 via the movable frame 21, but in practice, at least one pulley 13 is the other pulley 13 Any structure may be used as long as it is supported so as to be able to move closer to and away from it.

[0019]

As described above, according to the present invention, a neck portion whose width when viewed from a predetermined direction is narrower than a shaft width of a pulley to which a biasing force is applied is narrowed, and the pulley is provided at a predetermined position close to the other pulley. Since the assembly frame is provided with an insertion hole through which the neck details are inserted and a holding hole that is approximately the same width as the axial width of the pulley that communicates with this insertion hole, the neck details are inserted through the assembly frame side when attaching and detaching the sheet body. The pulley to a position close to the other pulley with a simple operation of simply rotating the pulley shaft so that the neck details are at an angle that does not come out of the insertion hole. It is possible to fix the position of the sheet body to allow the sheet body to be attached and detached. To return the pulley to its original position,
By simply rotating the pulley shaft so that the neck details come out of the insertion hole, the pulley shaft can be easily removed from the holding hole and the insertion hole to return the pulley to its original position. . Therefore, one pulley can be securely fixed to a position close to the other pulley to prevent the pulley from falling off from that position, and workability at that time can be improved.

[Brief description of drawings]

1A and 1B show an embodiment of the present invention, FIG. 1A is an exploded perspective view showing a support structure of a pulley, and FIG. 1B is a perspective view seen from a bottom surface side of a movable frame.

2A and 2B show a supporting structure of a pulley, FIG. 2A is a perspective view in a normal use state, and FIG. 2B is a plan view in a normal use state.

3A and 3B show a supporting structure of a pulley, FIG. 3A is a perspective view when a sheet body is replaced, and FIG. 3B is a plan view when the sheet body is replaced.

FIG. 4 is an overall perspective view showing an example of a conventional electronic blackboard.

FIG. 5 is an exploded perspective view of the blackboard body showing a state where the frame cover is removed from the body frame.

FIG. 6 is an exploded perspective view showing a state where the board assembly is removed from the main body frame.

FIG. 7 is an exploded perspective view of the board assembly.

FIG. 8 is an exploded perspective view showing a support structure for a pulley.

FIG. 9 is a perspective view showing a support structure of a pulley.

[Explanation of symbols]

 4 Body frame 5 Board assembly 7 Writing surface 8 Sheet body 12 Assembly frame 13 Pulley 13a Shaft 29 Neck detail 30 Insertion hole 31 Holding hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Fujita 6-78 Minamimachi, Mishima City, Shizuoka Prefecture Tech Mishima Factory

Claims (1)

[Claims] 1. A board assembly in which an endless sheet body is hung between a pair of pulleys supported by an assembly frame so as to be able to move toward and away from each other and at least one of which is biased away from the other, is attached to or detached from a main body frame. It is freely stored, and a part of the sheet body is exposed to the outside from the main body frame as a writing surface, and information written on the writing surface is optically written in the process of driving the pulley to roll the sheet body. In an electronic blackboard that is read and output, the shaft of the pulley to which a biasing force is applied forms a neck detail whose width viewed from a predetermined direction is narrower than the shaft width, and the pulley comes close to the other pulley. The assembly frame is provided with an insertion hole for inserting the neck detail at a predetermined position and a holding hole having a width substantially the same as the axial width of the pulley communicating with the insertion hole. And an electronic blackboard.