JP3489754B2 - Electronic blackboard - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a part of an endless sheet rollably held as a writing surface, and writes information written on the writing surface. The present invention relates to an electronic blackboard which optically reads the information during the rolling of a sheet member and outputs the read information. 2. Description of the Related Art In recent years, electronic blackboards having a function of hard-copying the contents written on a writing surface have become widespread, and have been used for presentations at conferences and lectures. FIGS. 4 to 9 show a conventional example of such an electronic blackboard. First, as shown in FIG.
The blackboard main body 2 supported by is provided. The blackboard main body 2 is formed such that a board assembly 5 is removably mounted inside a main body frame 4 having a frame cover 3 removably mounted on the front surface (see FIGS. 5 and 6). The board assembly 5 has a sheet member 8 serving as a writing surface 7 which is exposed to the outside through an opening 6 formed on the front surface of the blackboard main body 2. The sheet member 8 is formed in an endless shape and is supported to roll freely. Have been. In addition, the blackboard main body 2 has a built-in reduction reading optical system and a control unit (not shown) that optically reads the information written on the writing surface 7 while the sheet body 8 rolls and the written information moves. A printer 9 for hard-copying information read by the reduction optical system under the control of the control unit is provided. Further, an operation panel 10 is mounted near the printer 9. Here, the board assembly 5 will be described in detail with reference to FIGS. As shown in FIG. 7, the board assembly 5 has a sheet body 8 stretched on a pair of pulleys 13 rotatably mounted on both sides of a rectangular frame-shaped assembly frame 12 on which a writing board 11 is mounted. Is formed. Writing board 11
Is formed of a plywood or the like, and is disposed immediately behind the portion to be the writing surface 7 of the sheet body 8 to support the sheet body 8. The sheet body 8 is formed of, for example, polyester or the like, and one pulley 13 is connected to the other pulley 1.
It is stretched by being urged in a direction away from 3. [0005] 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 14. The movable frame 14 is slidable along the longitudinal direction of the assembly frame 12, so that 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 along its sliding direction.
5 is formed, and an auxiliary plate 17 is attached to an end of the assembly frame 12 via a stepped rivet 16 that enters the elongated hole 15. Therefore, a gap is formed between the assembly frame 12 and the auxiliary plate 17 by the stepped rivet 16, and the movable frame 14 is slidably mounted in the gap in the direction of the elongated hole 15. A hook 14 a is formed by folding back at the end of the movable frame 14.
A hook 17a is formed by folding back at an end of the coil, and a coiled tension spring 18 is stretched between the two hooks 14a and 17a. As a result, the movable frame 14 is urged outward from the assembly frame 12, and therefore the pulley 13 supported by the movable frame 14 is
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 hook 15a bent in a right angle direction, and the stepped rivet 16 is hooked on the hook 15a, so that the urging force of the tension spring 18 is applied. The movable frame 14 pushed in against the pressure is held at that position. [0006] The control panel 10 having such a structure is used.
The sheet body 8 is driven based on the above operation, and the sheet body 8 rolls and moves in the left-right direction. At this time, the information written on the writing surface 7 can be read by the reduction optical system and hard copied by 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 main body frame 4 and then the board assembly 5 is removed.
Remove. Then, the pulley 13 attached to the movable frame 14 is pushed in, brought close to the other pulley 13, and moved in a direction perpendicular to the pushing direction, so that the hook 15 a communicating with the end of the long hole 15 of the movable frame 14.
Is hooked on one stepped rivet 16. This allows
The pair of pulleys 13 are supported at positions close to each other, and the sheet body 8 is slackened, so that the sheet body 8 can be easily attached to and detached from the board assembly 5. However, when one of the pulleys 13 is pushed in during the attachment / detachment work of the sheet member 8,
The pulley 13 is merely supported by the hook 15 a of the movable frame 14 hooked on the stepped rivet 16. For this reason, there is a problem that the hook portion 15a falls off the stepped rivet 16 and the position fixing of the pulley 13 is easily released. If the angle between the elongated hole 15 and the hook 15a is formed to be an acute angle, the hook 15a is less likely to fall off from the stepped rivet 16, but in this case, it becomes difficult to release the position of the pulley 13 from being fixed, and the workability is reduced. Is impaired. As a result, the sheet member 8 may be damaged during the operation, which is not desirable. According to the present invention, a biased pulley shaft is formed with a narrow neck portion having a width, as viewed from a predetermined direction, smaller than the shaft width. An insertion hole through which the details of the neck are inserted at a predetermined position close to the pulley, and a holding hole having substantially the same width as the shaft width of the pulley communicating with the insertion hole are provided in the assembly frame. Therefore, when attaching and detaching the sheet body,
Push the pulley, insert the details of the neck 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 shaft of the pulley so that the neck details do not fall out of the insertion hole . Thereby, the shaft of the pulley is stably held in the holding hole, and the position of the pulley is fixed at a position close to the other pulley. Then, in order to return the pulley to the original position, the pulley shaft is rotated so that the details of the neck come out of the insertion hole. Thereby, the shaft of the pulley is easily dropped from the holding hole and the insertion hole, and the pulley returns to the original position. An embodiment of the present invention will be described with reference to FIGS. 4 to 7 are denoted by the same reference numerals, and description thereof is omitted. The support structure for the biased pulley 13 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, so that the pair of pulleys 13 are supported so as to be close to and away from each other. That is, a guide piece 22 and a guide hole 23 are formed at the end of the assembly frame 12 along the longitudinal direction. The guide piece 22 is formed to be bent at a right angle from the assembly frame 12, and the guide piece 22 is formed with a concave portion 22a for hooking an end of a tension spring S described later. In addition, the movable frame 21 is provided with the guide piece 2 along its longitudinal direction.
2 is formed, and a guide piece 25 fitted in the guide hole 23 of the assembly frame 12 and a hook 27 having a concave portion 26 for hooking an end of the tension spring S are at right angles. It is formed by folding back. Here, the guide holes 23 and 24 are formed to be 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. The other end has inclined portions 23b and 24b inclined with respect to the longitudinal direction.
Is formed. Therefore, the movable frame 21
Are the guide pieces 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 slidably attached to the assembly frame 12 by fitting each other. When the movable frame 21 is attached to and detached from the assembly frame 12, the guide pieces 22 and 25 are connected to the wide portions 23a and 24.
The dimensions of each part are determined so as to be inserted into the guide holes 23 and 24 from a. A recess 22a formed in the guide piece 22 on the side of the assembly frame 12 and a recess 2 formed in the hook 27 of the movable frame 21.
6, the tension spring S is stretched around in tension. A shaft 13a of the pulley 13 is rotatably attached to an end of the movable frame 21 via a bearing 28. As a result, the tension spring S is contracted and the hook 27 of the movable frame 21 is pulled, whereby the movable frame 21 is urged outward from the assembly frame 12, and is thus supported by the movable frame 14. The pulled pulley 13 is urged in a direction away from the other pulley 13. Here, a neck portion 29 is formed on a shaft 13a of the pulley 13 attached to the movable frame 21. The neck detail 29 is a portion formed so that the width viewed from a predetermined direction is narrower than the width of the shaft 13a, and is formed by cutting out two portions of the outer peripheral surface of the shaft 13a. At the end of the assembly frame 12, an insertion hole 30 and a holding hole 31 are formed 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 size 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 aligned with the shaft 13 a of the pulley 13. They have the same diameter. In such a configuration, when attaching and detaching the sheet body 8 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 related art. Then, the pulley 13 attached to the movable frame 21 is pushed in against the urging force of the tension spring S so as to approach the other pulley 13, and the neck detail 29 formed on the shaft 13a is inserted into the insertion hole on the assembly frame 12 side. 30 and positioned in the holding hole 31.
So that the angle between the pulley 13 and the pulley 13 does not fall out of the insertion hole 30.
Is rotated. As a result, the shaft 13a of the pulley 13 is stably held in the holding hole 31, and the position of the pulley 13 is 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 set so that the neck detail 29 comes out of the insertion hole 30.
The third shaft 13a is rotated. Thereby, the shaft 13a of the pulley 13 easily falls off from the holding hole 31 and the insertion hole 30, and the pulley 13 returns to the original position by the urging force of the tension spring S. Therefore, when one pulley 13 is fixed at a position close to the other pulley 13 in order to loosen the sheet member 8, the pulley 13 can be reliably prevented from dropping from the fixed position. The workability at that time is also good. In implementation, the neck detail 29
What is necessary is that the width viewed from the predetermined direction is formed smaller 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. Shape may be used. Further, in this embodiment, one pulley 13 is slidably attached to the assembly frame 12 via the movable frame 21. However, in the embodiment, at least one pulley 13 is connected to the other pulley 13 Any structure may be used as long as it is supported so as to be able to approach and move away from it. According to the present invention, the width of the shaft of the pulley to which the urging force is applied is narrower than the width of the shaft when viewed from a predetermined direction, and the pulley is close to the other pulley. An insertion hole through which the neck detail is inserted at a predetermined position and a holding hole having substantially the same width as the shaft width of the pulley communicating with the insertion hole are provided on the assembly frame. Inserting the pulley close to the other pulley by simply rotating the pulley shaft so that the neck details do not fall out of the insertion hole by inserting it into the holding hole by inserting it into the holding hole The sheet can be stably fixed at the position, and the sheet body can be detached and attached. To return the pulley to its original position,
By simply rotating the pulley shaft so that the details of the neck come out of the insertion hole, the pulley shaft can be easily dropped from the holding hole and the insertion hole to return the pulley to its original position. . Therefore, it is possible to reliably fix one pulley at a position close to the other pulley, to prevent the pulley from dropping from that position, and to improve the workability at that time.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1A and 1B show an embodiment of the present invention, wherein FIG. 1A is an exploded perspective view showing a pulley support structure, and FIG. 1B is a perspective view seen from the bottom side of a movable frame. . 2A and 2B show a support structure of a pulley, in which 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 support structure of a pulley, wherein 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 main body in a state where a frame cover is removed from a main body frame. FIG. 6 is an exploded perspective view showing a state where the board assembly has been 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 pulley support structure. FIG. 9 is a perspective view showing a pulley support structure. [Description of Signs] 4 Body frame 5 Board assembly 7 Writing surface 8 Sheet body 12 Assembly frame 13 Pulley 13a Shaft 29 Detail of neck 30 Insertion hole 31 Holding hole

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kenji Fujita 6-78, Minami-cho, Mishima-shi, Shizuoka Pref. Inside Tec Mishima Plant (56) References Japanese Utility Model 1-108794 (JP, U) Japanese Utility Model Sho 62-178189 (JP, U) Japanese Utility Model Showa 63-100295 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B43L 1/04

Claims (1)

(1) An endless sheet member is hung between a pair of pulleys supported by an assembly frame so as to be able to approach and separate from each other and at least one of which is urged in a direction away from the other. The passed board assembly is removably stored in the main body frame, a part of the sheet body is exposed to the outside from the main body frame as a writing surface, and the pulley is driven to roll the sheet body in a process of rolling. In an electronic blackboard that optically reads and outputs information written on a writing surface, a width of a shaft of the biased pulley viewed from a predetermined direction is formed with a narrow neck portion narrower than the shaft width. An insertion hole through which a pulley is inserted at a predetermined position where the pulley is close to the other pulley, and a holding hole having substantially the same width as the shaft width of the pulley communicating with the insertion hole are formed in the assembly frame. Electronic blackboard, characterized in that provided in the arm.