JP2003228132A - Motor-driven screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor-driven screen which is arranged almost at the center of a casing in a longitudinal direction with respect to the casing even while it is made compact. <P>SOLUTION: This motor-driven screen comprises a driving rotator 4 for rolling the screen 3 up, an electric motor 5 for driving arranged inside the driving rotator 4, a casing main body 11 for housing the driving rotator 4, a supporting member 13 arranged inside the casing main body 11 and also for turnably supporting the driving rotator 4, an end part cap 12 for closing an end part opening part opened at the both ends of the casing main body 11, and a controller 8 for the electric motor 5 arranged within one space from among spaces formed between each supporting member 13 and each end part cap 12. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes the driving force of an electric motor in a storage posture in which a screen is placed in a casing and is wound around a drive rotor, and in a use posture which is extended from the drive rotor. The present invention relates to an electric screen configured to change its posture.

[0002]

2. Description of the Related Art As the electric screen, for example, one shown in FIG. 7 is generally used. That is, the casing 30
A bracket 32 for supporting a drive rotating body 31 for winding up the screen 3 is disposed inside the casing 30 in a state of being brought close to one end in the longitudinal direction of the casing 30, and the drive rotating body 31 is also provided.
A large-sized control device 33 for driving and controlling an electric motor (not shown) provided inside the casing was arranged at the other end side in the casing 30. Reference numeral 34 shown in FIG. 7 is a cable for connecting the control device 33 and an electric motor (not shown), and 35 is an output signal from a remote control (so-called remote control) which is a remote control means. And a cable for inputting a reception signal from a receiver (also referred to as a remote control light receiving unit) 36 to the control device 33, and
Reference numeral 37 is a cable for inputting an operation signal from a manual switch 38 capable of manually rotating the electric motor to the control device 33.

[0003]

According to the above configuration, by housing the electric motor in the casing 30,
Although the electric screen can be prevented from increasing in size in the longitudinal direction, it is arranged on the side of the casing 30 adjacent to the screen 3 (on the other end side of the casing) as it is without modifying the large-sized control device. Therefore, there is a disadvantage that not only the entire electric screen becomes large in the longitudinal direction but also the weight increases. Further, since the control device 33 is arranged on the other end side of the casing 30 as described above, it is impossible to position the screen 3 at the center of the casing 30 in the longitudinal direction. Even if it is arranged, not only the screen 3 cannot be arranged in the left and right center of the room, but also the design (design) is impaired.
There was room for improvement.

In view of the above-mentioned situation, the present invention is to solve the problem by providing an electric screen which can be arranged in the longitudinal direction of the casing with respect to the casing while being made compact. .

[0005]

In order to solve the above-mentioned problems, the electric screen of the present invention has a cylindrical driving rotary member for winding the screen and a rotary driving member for rotating the driving rotary member. An electric motor arranged inside the drive rotating body, a cylindrical casing body for housing the drive rotating body, and a support member arranged in the casing body for rotationally supporting the drive rotating body. And an end cap for closing the end openings opened at both ends of the casing body, and arranged in one of the spaces formed between the support members and the end caps. It is composed of a control device for the electric motor. In recent years, miniaturization of electronic parts such as transformers and semiconductors has been rapidly progressing, and the inventor of the present application has found that such miniaturized transformers and electronic parts can be effectively used to form a control circuit for an electric motor. Ran Then, the miniaturized control device is provided in a space formed between a support member for rotationally supporting the driving rotary member and a lid portion for closing end opening portions opened at both ends of the casing body. Not only was it possible to reduce the size of the electric screen, but it was also possible to arrange the screen in the casing approximately at the center in the longitudinal direction. Moreover, by centrally arranging the control devices in one space, not only the wiring can be shortened as compared with the case where the control devices are arranged in both spaces but also the wiring work can be performed easily and quickly.

The support member is a bracket having a shape that is open at least to the outside in the direction of the axis of rotation of the screen, and can be fitted into the casing body from both ends thereof. The screen is opened inward in the direction of the axis of rotation of the screen and has a box shape that can be externally fitted to the casing body. By fitting the support member inside the casing body and fitting the end cap outside the casing body as described above, the casing body can be sandwiched between the support member and the end cap. Therefore, the shape retention strength at both ends of the casing body can be increased.
After the end cap is fitted, two members, that is, the support member and the end cap, are fixed to the casing body at once by screwing and fixing the end cap, the casing body, and a screw that penetrates the support member. can do. Alternatively, the support member and the end cap may be integrated in advance, and the integrated member may be fitted to the casing body and then fixed to the casing body. In this case, although the end cap is detachably attached to the casing body by screwing, which is advantageous for maintenance, the end cap may be completely fixed to the casing by welding or the like so that it cannot be removed.

An elastic body for holding the motor body at a predetermined rotation position is interposed between the support member that rotatably supports the motor body of the electric motor and the motor body, and the drive rotation is performed. By applying a load larger than the holding force by the elastic body to the drive rotating body during the rotation of the body,
When the motor body rotates in the direction opposite to that of the drive rotating body, a detecting means for detecting the rotating body and a stopping means for stopping the driving of the electric motor by a rotation detection signal from the detecting means are provided. As described above, since the motor main body of the electric motor is rotatable and is held by the elastic body at the predetermined rotating position, a load larger than the holding force of the elastic body is applied to the electric motor, The motor body rotates in the direction opposite to the drive rotation shaft. When this is detected by the detecting means, the driving of the electric motor is stopped by the stopping means. The load prevents the electric motor from rotating when the screen is wound up, for example, the lower end of the screen is caught by another object to make it impossible to wind up or the finger is accidentally put in the casing housing the screen. Say that resistance will be given to you.

The detecting means is composed of a rotating member integrally attached to the motor body so as to be rotatable, and two limit switches arranged on the rotating path of the rotating member. Therefore, as described above, when the load is applied to the driving rotating body and the motor body rotates to one side, it contacts one of the limit switches arranged on the circuit path, and the limit switch is turned on. To do. Then, the drive of the electric motor is stopped by the ON signal of the limit switch. When the motor body rotates in the opposite direction to the above direction, the motor body comes into contact with the other limit switch, and the limit switch is turned on. Then, the drive of the electric motor is stopped by the ON signal of the limit switch. By using the contact type limit switch as described above, the reliability can be improved as compared with the case where the non-contact type sensor is provided.

The rotating member is a substantially rectangular plate member having a longitudinal dimension larger than the outer shape of the motor body, and the elastic body is a coil spring connecting the plate member and the fixed portion. There is. Just change the coil spring to another coil spring with different elastic force as described above,
The timing (sensitivity) of stopping the driving of the electric motor can be adjusted.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show an electric screen (size (size) may be other than that shown in the drawing) 1 for displaying an image from a projector or the like. The electric screen 1 has a rectangular cross section (a circular shape, an elliptical shape, a polygonal shape, or the like) in which an opening 2A that is long in the left-right direction and has a size such that a finger can be inserted in the front-back direction is formed. A cylindrical drive rotor 4 that is rotatably supported to wind up the screen 3 and an electric motor 5 that rotationally drives the drive rotor 4 are provided in the casing 2. . The electric motor 5 is shown in FIG.
As shown in (a), it is composed of an electric motor body 5B and a drive rotation shaft 5A protruding from the electric motor body 5B. As shown in FIG. 6 (b), a convex portion 4A is formed at one location on the inner surface of the drive rotor 4 over the entire area in the left-right direction, and a concave portion 6A that engages with the convex portion 4A is circumferentially aligned. The rotary body 6 provided at the location is provided with the drive rotary shaft 5A of the electric motor 5.
It is attached to the tip of the so as to rotate together. Therefore, by rotating the drive rotating shaft 5A of the electric motor 5 to one side, the screen 3 wound around the drive rotating body 4 is extended downward through the opening 2A, and an image from, for example, a projector (not shown) is displayed. It is possible to change the posture to a usable posture, and by driving the drive rotation shaft 5A of the electric motor 5 in the opposite direction to the above-mentioned rotation direction, the screen is brought into a storage posture wound around the drive rotor 4. The posture of 3 can be changed. The rotation command signal to the electric motor 5 is input to the control device 8 via a receiver (remote control light receiving unit) 7 that receives an output signal from a wired or wireless remote control, and is output from the control device 8. In addition, an operation signal from a manual switch 9 provided in the casing 2 or the like may be input to the control device 8 and output from the control device 8, or any other method may be used. Reference numeral 10 shown in FIG. 1 is fixed to one end of the screen 3 and serves as a weight for flattening the surface of the screen 3 when the screen 3 is in use, and the casing 10 when the screen 3 is in storage. The bar is for locking the two openings 2A and covering the openings 2A, but may have a shape other than that shown in the drawing.
Reference numeral 18 shown in FIG. 1 denotes the receiver 7 and the control device 8.
And 19 are cables for connecting the manual switch 9 and the control device 8, and the cables 18, 19 are through holes formed in the end cap 12 described later. Although it is drawn to the outside of the casing 2 via 12D, 12D, only the receiver 7 may be provided inside the casing 2 and the manual switch 9 may be wirelessly connected to the control device 8. Also, in FIG.
By fixing the rotary body 6 to the drive rotary shaft 5A of the electric motor 5 and engaging the rotary body 6 with the drive rotary body 4,
Although the drive rotating shaft 5A of the electric motor 5 and the drive rotating body 4 are interlocked and coupled, it is also possible to interlock and drive both by utilizing a gear mechanism or the like. Further, although the control device 8 is arranged on the right side in FIG. 1, it may be arranged on the left side.

As shown in FIGS. 1 to 3, the casing 2 closes a casing body 11 for accommodating the drive rotating body 4 and end opening portions 11A opened at both ends of the casing body 11. End caps 12, 1 for
It consists of 2. Each of the end caps 12 has a box shape that is open to the inside in the direction of the rotation axis X of the screen 3 and can be externally fitted to the end of the casing body 11. The end cap 12 has an end opening 11
A rectangular lid (A is a square in the figure, but may be rectangular, circular, etc.) that closes A, and a casing extending from the four sides of the lid 12A in the direction of the rotation axis X and the casing. Four side plate parts 1 that come into contact with the main body 11
It consists of 2B.

Support members 13, 13 for supporting one end of the drive rotor 4 and the other end via the motor body 5B of the electric motor 5 are internally provided at both ends of the casing body 11. Is equipped with. Each of the support members 13 is opened to the outside in the direction of the rotation axis X of the screen 3, and is opened to one side (rear) in the front-rear direction orthogonal to the direction of the rotation axis X and inside the casing body 11. It consists of a bracket that can be fitted freely. The bracket 13 has an inner surface that supports the motor body 5B of the electric motor 5, and an outer surface that includes the control device (a circuit including electronic components such as a transformer and a transistor) shown in FIG. ) 8 is attached to the main body 13A in the form of a vertical plate and the upper end of the main body 13A,
The extension caps 13B, 13C, and 13D extend from the lower end and the front end in the direction of the rotation axis X and come into contact with the inner surface of the casing body 11. It may have a box shape that is open only to the outer side in the direction of the rotation axis X, or may be configured as a bracket having a substantially U-shape when viewed in the front-rear direction provided with only the upper and lower extending portions 13B and 13C. Good
Further, as shown in FIG. 5, it is also possible to implement it by constructing an inverted L-shaped bracket 13 having an extending portion 13B only at the upper end with respect to the main body portion 13A.

When assembling the electric screen, for example, the motor body 5B of the electric motor 5 located at the end of the drive rotor 4 arranged in the casing body 11 is fixed to the support member 13 with screws or the like. , Support member 1
3 is inserted into the casing main body 11 by inserting the end opening 11A into the casing main body 11, and then the end cap 12 is externally fitted to the end of the casing main body 11, and then the screw N is attached to the end cap 12. The end cap 1 is formed by screwing into the screw hole 13E formed in the support member 13 through the formed through hole 12C and the through hole 11B of the casing body 11.
2 and the support member 13 can be fixed to the end portion of the casing body 11 all at once. After mounting the support member 13 and the end cap 12 on one end of the casing main body 11 as described above, the support member 13 and the end cap 12 are also mounted on the other end of the casing main body 11 in the same manner. Assembly can be completed. By assembling the support member 13 and the end cap 12 in advance by screws or welding and mounting the integrated support member 13 and the end cap 12 on the casing body 11, the assembly process can be reduced. There are advantages. Further, by making the end cap 12 detachable from the casing body 11, it is advantageous in terms of maintenance, but it may be completely fixed so that it cannot be removed by welding or the like. Further, the end cap 12 may be detachably attached to the casing body 11 by the screw N, or may be easily detachable by locking or the like.

As shown in FIGS. 4 and 5, at the end of the electric motor 5 opposite to the drive rotary shaft 5A of the motor body 5B, the longitudinal dimension is larger than the outer shape (diameter dimension) of the motor body 5B. Also fixes a large rectangular plate member 14, and a screw 16 to be described later is provided on the surface of the plate member 14 (right lateral side in the figure).
The columnar spacer 15 having the through hole 15A formed therethrough is fixed. Then, the motor body 5B is rotatably attached by screwing the spacer 15 into the motor body 5B through the screw 16 from the hole 13F (see FIG. 3) formed in the support member 13 while the spacer 15 is in contact with the support member 13. There is. In addition, the holes 14 formed in the plate member 14
By interposing a coil spring 17 as an elastic body across K and a hole (not shown) formed in the support member 13, the plate member 14, that is, the motor body 5B is moved to a predetermined rotation position (shown in FIG. 5). It can be held in a horizontal position). Although FIG. 5 shows a state in which the cover 8K that covers the control device 8 attached to the support member 13 is attached, the cover 8K may be omitted and implemented. or,
K shown in FIG. 5 is a connector for electrically connecting the electric motor 5 to the control device 8. Since members not described in FIGS. 4 and 5 are the same as those in FIGS. 1 to 3, the same reference numerals are given and the description thereof is omitted.

As shown in FIGS. 4 and 5, the upper and lower portions of the inner surface of the support member 13, that is, on the rotation path of the plate member 14 and on both sides with the plate member 14 interposed therebetween. Limit switches R1 and R2 (which may be a non-contact type sensor) as detection means for detecting that the motor body 5B has rotated in the opposite direction to the drive rotating body 4 are attached to the position where it is located, As shown in FIG. 6 (b), the finger H is thrust from the opening 2A of the casing 2 and the holding force (biasing force) by the coil spring 17 is applied to the drive rotating body 4 (during winding) rotating in the direction Y of the drawing. By applying a large load, the motor body 5B rotates in the direction Z opposite to the drive rotation shaft 5A, so that the lower side of the horizontal plate portions 14A and 14B provided above and below one longitudinal end of the plate member 14 Horizontal plate Limit switch R of 14B is lower
This limit switch R2 is turned on by touching 2
Then, this ON signal is input to the control device 8 shown in FIG. The control device 8 outputs a drive stop signal to the electric motor 5 to stop the drive of the electric motor 5. The plate member 14, the limit switches R1 and R2, and the control device 8 constitute stop means for stopping the driving of the electric motor 5. When a load is applied to the drive rotor 4 as described above while the drive rotor 4 is rotating in the direction opposite to the rotation direction Y (when the screen 3 is being extended), the plate member 14 moves in the direction. By rotating in the direction opposite to Z, the upper horizontal plate portion 14A comes into contact with the upper limit switch R1 to turn it on. When this ON signal is input to the control device 8, a drive stop signal is output from the control device 8 to the electric motor 5, and the drive of the electric motor 5 is stopped. Instead of the coil spring 17, for example, an elastic body made of urethane rubber (any material having elasticity) may be used.

[0016]

According to the first aspect of the present invention, the electric motor is arranged in the casing, and a miniaturized transformer, electronic component, or the like is used, and these are rotatably supported by the drive rotor. By reasonably arranging it in the space formed between the support member for closing and the end portion opening at both ends of the casing main body, it is possible to increase the size of the casing in the longitudinal direction. Since it can be suppressed, not only can the electric screen be made compact (smaller), but also the screen can be arranged in the casing approximately at the center in the longitudinal direction, so that the electric screen is advantageous in terms of handleability. Can be provided. Moreover, by centrally arranging the control devices in one space, not only can the wiring be shorter than the one that is distributed to both spaces, but also the wiring work can be performed easily and quickly. It is also advantageous in terms of aspects.

According to the second aspect of the present invention, the support member and the end cap are fitted to the casing body and the end cap is fitted to the casing body. With the sandwiched state, it is possible to increase the shape retention strength of both ends of the casing main body fixed to the ceiling, the wall, etc., and it is possible to provide a highly reliable electric screen with little deformation or damage. After the end cap is fitted, two members, that is, the support member and the end cap, are fixed to the casing body at once by screwing and fixing the end cap, the casing body, and a screw that penetrates the support member. There is an advantage that can be done.

According to the third aspect of the present invention, the motor main body of the electric motor is rotatable and is held by the elastic body at a predetermined rotational position. Even if the user has rushed in, the detection means can detect this and immediately stop the driving of the electric motor, thus providing a highly reliable electric screen. In addition, the mechanical structure utilizing the movement of the motor body can simplify the control circuit and reduce the cost.

According to the invention of claim 4, by using the contact type limit switch as the detecting means, not only the reliability can be improved as compared with the case where the non-contact type sensor is provided, but also in terms of cost. Will also be advantageous.

According to the fifth aspect of the present invention, the timing (sensitivity) of stopping the driving of the electric motor can be adjusted only by changing the coil spring to another coil spring having a different elastic force, and the design can be easily changed. There are advantages.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of an electric screen.

FIG. 2 is a vertical cross-sectional view showing one end of an electric screen.

FIG. 3 is an exploded perspective view showing one end of a casing.

FIG. 4 is a vertical cross-sectional view showing one end of another electric screen to which a coil spring is attached.

5 is an exploded perspective view showing a main part of the electric screen shown in FIG.

FIG. 6 shows a specific configuration of a stop means for stopping the driving of the electric screen, (a) shows a state in which the driving of the electric screen is started, and (b) shows that the finger is put inside the casing to drive the electric screen. It shows a state in which a load is applied to the rotating body.

FIG. 7 is a perspective view showing an outline of a conventional electric screen.

[Explanation of symbols]

1 Electric screen 2 Casing 2A opening 3 screen 4 Drive rotator 4A Convex part 5 Electric motor 5A Drive shaft 5B Motor body 6 Rotating body 6A recess 7 receiver 8 Control device 9 Manual switch 10 bar 11 Casing body 11A end opening 11B through hole 12 End cap 12A Lid 12B Side plate 12C Through hole 12D through hole 13 Support member (bracket) 13A main body 13B, 13C, 13D extension part 13E screw hole 13F through hole 14 Plate member 14A, 14B Horizontal plate part 14K hole 15 spacer 15A Through hole 16 Screw 17 Coil spring 18, 19 Cable 30 casing 31 Drive rotor 32 Bracket 33 control device 34, 35 cable 36 receiver 37 cable 38 Manual switch H finger N screw K connector R1, R2 limit switch X axis of rotation Y, Z direction

Claims (5)

[Claims] 1. A cylindrical drive rotor for winding a screen, an electric motor arranged inside the drive rotor for rotating the drive rotor, and the drive rotor. A tubular casing body for supporting, a support member arranged in the casing body for supporting the driving rotary body in rotation, and for closing end opening portions opened at both ends of the casing body. An electric screen comprising an end cap and a controller for the electric motor arranged in one of the spaces formed between the support members and the end caps. 2. The end cap is formed by the support member being a bracket having a shape that is open at least to the outside in the direction of the axis of rotation of the screen and can be fitted into the casing main body from both ends thereof. But,
The electric screen according to claim 1, wherein the electric screen has a box shape that is opened inward in the direction of the axis of rotation of the screen and can be externally fitted to the casing body. 3. An elastic body for holding the motor main body at a predetermined rotational position is interposed between the support member rotatably supporting the motor main body of the electric motor and the motor main body, and By applying a load larger than the holding force of the elastic body to the drive rotating body during the rotation of the drive rotating body,
2. When the motor body rotates in a direction opposite to that of the driving rotating body, a detecting means for detecting the rotating body and a stopping means for stopping the driving of the electric motor by a rotation detection signal from the detecting means are provided. Alternatively, the electric screen according to item 2. 4. The detection means comprises a rotary member integrally rotatably attached to the motor body, and two limit switches arranged on a rotary path of the rotary member. The electric screen according to 3. 5. The rotating member is formed of a substantially rectangular plate member having a longitudinal dimension larger than the outer shape of the motor body, and the elastic body is formed of a coil spring connecting the plate member and the fixed portion. The electric screen according to claim 3 or 4, wherein: