JP2005157155A - Winding roll mechanism for screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a winding roll mechanism for a screen by which the initial winding state of a coil spring can be surely held while easily and quickly performing assembling work and replacing work. <P>SOLUTION: The coil spring 9 is arranged between one end side of a supporting shaft 7 stored in a winding roll 6 for winding the screen and a rotor 8 arranged on the other end side of the supporting shaft 7, the supporting shaft 7 is provided with a screw part 11 for moving a 2nd rotor 10 to be rotated in accordance with the rotation of the winding roll 6 in an axial direction and an abutting part for abutting on the 2nd rotor 10 for moving the screw part 11 by the rotation of the winding roll 6 to the winding side and a cylindrical body 14 is formed so as to cover a part from the rotor 8 up to the 2nd rotor 10 in a state that the 2nd rotor 10 is allowed to abut on the abutting part, in a state that initial winding excitation force is applied to the coil spring and in an integrally rotating state with the rotor 8 and the 2nd rotor 10 and stored in the winding roll 6 in an integrally rotating state. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the present invention, a support shaft for rotatably supporting the take-up roll is provided in a take-up roll for winding the screen, and the take-up is provided on one end side of the support shaft and the other end side of the support shaft. A coil spring is disposed between the roll and a rotating body provided so as to be integrally rotatable with the roll, and the winding roll is driven and rotated using the return biasing force of the coil spring so that the screen can be wound freely. The present invention relates to a screen winding roll mechanism.

In the screen take-up roll mechanism, the length of the take-up roll is 1/3 or more so that a predetermined winding attachment force is applied at the screen take-up completion position so that the screen can be taken up reliably. The coil spring which has is wound for the first time. Then, both ends of the coil spring in the initial winding state as described above, that is, a support shaft in which one end of the coil spring is locked and fixed, and a rotating body in which the other end of the coil spring is locked and fixed (relatively rotatable with respect to the support shaft) Is attached to the left and right brackets of the casing, and then both ends of the support shaft are inserted. The screen installation work is completed. In addition, in order to wind the coil spring having a large elastic force having a length of 1/3 or more for the first time, a large rotational operation force is required. It was very difficult.
In the above work, until the both ends of the support shaft are inserted into the bracket, it is necessary to prevent the initially wound coil spring from being unwound, and the work is very troublesome and troublesome.
Therefore, a drive ring that is relatively rotatable at one end of the support shaft and can be rotated integrally with the take-up roll is externally fitted so as to be movable in the axial direction, and a bearing is attached to the other end of the support shaft so as to be integrally rotatable. A coil spring is stretched between the ring and the bearing, and an engagement piece that engages in a rotation direction with a protrusion protruding inwardly on the inner surface of the drive ring is provided at one end of the support shaft, Rotate the drive ring with respect to the shaft core in a predetermined direction, and move the drive ring to the drive ring side of the support shaft when its projections get over the engagement piece of the support shaft. By releasing the hand, the protrusion of the drive ring engages with the engagement piece of the support shaft until the drive ring makes one rotation, and the initial winding of the coil spring is held. From this state, after the winding roll is fitted externally, both ends of the support shaft are supported by the bracket, and at the same time, the support shaft is moved to the bracket side on the drive ring side while rotating the winding roll to release the engagement. Thus, the configuration is such that the attachment of the screen to which the initial winding is applied can be completed by setting the engaging piece of the support shaft in the drive ring (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 61-78989

In Patent Document 1, the protrusion of the drive ring is engaged with the engagement piece of the support shaft until the drive ring makes one rotation by releasing the hand after rotating the drive ring with respect to the support shaft in the non-rotating state. In addition, after the initial winding of the coil spring is held, the engagement may not be released unexpectedly, and the work for releasing the engagement is required when mounted on the bracket. Thus, not only is the operation cumbersome, but if the user forgets to release the engagement, the screen may not be wound or unwound (unrolled).
Further, in recent years, when it is desired to replace the screen with another screen having a different fabric, for example, the work for releasing the engagement is required. Skill was necessary and it was difficult for an unskilled person (user) to replace.
Further, when the screen is replaced, the initial winding of the coil spring may return unless the engagement is carefully released. In particular, when an unskilled person (user) or the like performs replacement work, the above-mentioned result is often obtained. Incidentally, after the initial winding of the coil spring has returned, it is difficult to perform the initial winding again on the coil spring, and there is room for improvement.

  In view of the above-described situation, the present invention intends to solve the problem that the winding for the screen can reliably hold the initial winding state of the coil spring while the assembly work and the replacement work can be easily and quickly performed. The point is to provide a roll taking mechanism.

The screen take-up roll mechanism of the present invention is provided with a support shaft for rotatably supporting the take-up roll in the take-up roll for taking up the projection screen in order to solve the aforementioned problem. A coil spring is disposed between one end side of the support shaft and a rotating body provided on the other end side of the support shaft so as to be integrally rotatable with the winding roll, and the return biasing force of the coil spring is utilized. In the screen take-up roll mechanism configured to drive and rotate the take-up roll to freely wind the screen, a second rotating body that rotates as the take-up roll rotates on the support shaft. A screw portion for moving in the axial direction is provided, and the screen winding of the winding roll is completed by contacting the second rotating body that moves the screw portion by rotation of the winding roll toward the winding side. The support part for regulating the position is In the state where the second rotating body is in contact with the contact portion and the initial winding biasing force is applied to the coil spring, the rotating body and the second rotating body are integrated with each other. A winding roll mechanism for a screen, characterized in that a cylindrical body is provided that is rotatably mounted and is mounted on the winding roll so as to be integrally rotatable.
In the state where the initial winding biasing force is applied to the coil spring as described above, the cylindrical body is externally and rotatably mounted across the rotating body and the second rotating body, so that the return force from the coil spring is applied to the rotating body. However, since the second rotating body is in contact with the protruding portion, the second rotating body is in a state in which it cannot rotate, and the rotation of the cylindrical body is the first. It will be blocked by the two-rotor, and the state in which the initial winding biasing force is applied to the coil spring can be maintained. In this state, the screen mounting operation can be completed by mounting the take-up roll and supporting the both ends of the support shaft on the left and right brackets. The winding roll rotates by pulling the wound screen downward (either horizontal or diagonal) against the biasing force of the spring, and this rotational force rotates through the cylindrical body for the second rotation. It is transmitted to the body, and the second rotating body moves to the side opposite to the side that contacts the contact portion while rotating.
An end cap may be provided on the other end of the support shaft.
Moreover, you may comprise the said contact part from the double nut screwed together by the said screw part.
In addition, a protrusion projecting inwardly is provided on the inner surface side of the cylindrical body, and the cylindrical body is moved to the exterior by moving the cylindrical body from the axial direction to the rotating body and the second rotating body. The rotating body and the second rotating body may be provided with an engaged portion that engages with the protrusion and makes both of them rotatable.

  The first roll biasing force is applied to the coil spring while the second rotating body is in contact with the contact portion for regulating the screen winding completion position of the winding roll, and then the cylindrical body is rotated. By simply attaching the cylindrical body to the body and the second rotating body, the state in which the initial spring biasing force is applied to the coil spring can be securely held, and the screen can be used as it is. As a matter of course, the replacement work can be easily and quickly performed, and it is advantageous in terms of the work surface that even an unskilled person can work easily. Moreover, the coil winding spring can be unwound unintentionally during the replacement work unlike the conventional configuration, and a highly reliable screen winding roll mechanism can be provided.

  By configuring the contact portion from a double nut screwed to the screw portion, the screen winding completion position of the winding roll can be changed only by changing the screwing position of the double nut.

  By providing an engaged portion that engages with the protrusion provided on the cylindrical body on the rotating body and the second rotating body, the cylindrical body can be turned into two rotating bodies simply by mounting the cylindrical body. It can be in a state where it can rotate integrally.

  FIG. 1 shows a screen device provided with a screen winding roll mechanism A on one side in the longitudinal direction, and the projection screen 1 wound up by the screen winding roll mechanism A is drawn downward to give a projector or the like. Is shown in a state where the posture is changed to a use posture that enables projection of a video from the front (in the figure, only the left side is shown in the front view). Reference numeral 2 shown in FIG. 1 denotes a bar for regulating the winding position of the screen 1 wound and housed in the casing 4 indicated by a two-dot chain line by contacting the opening of the casing 4. A handle 3 is attached approximately in the center in the direction. Note that the restriction of the winding position of the screen 1 is supplementarily performed by the bar 2 and is actually performed by the second rotating body 10 described later, and the bar 2 is provided at the opening of the casing 4. You may make it stop just before touching. Therefore, the casing 4 can be omitted. In FIG. 1, after removing at least one of the left and right pair of substantially L-shaped brackets 5 (only the left side is shown in the figure), the screen take-up roll mechanism A is attached to the brackets 5. The two support shafts 7 (one side not shown) projecting outward from both ends of the take-up roll 6 constituting each of the winding rolls 6 are supported so as to be attached to the removed brackets 5. What is the shape of the bracket if it is a bracket with an arc-shaped notch that can be inserted into the bracket 7 without having to remove the bracket and only need to lock the support shaft to the notch? It may be. N shown in FIG. 1 is a nut for screwing on the support shaft 7 protruding through the bracket 5 and fixing the support shaft 7 to the bracket 5. The nut may be omitted. Here, the screen device is fixed to the wall, but the screen device may be fixed to the ceiling. In addition to the configuration in which the two support shafts are provided in the take-up roll 6, a configuration in which one support shaft longer than the take-up roll 6 is provided in the take-up roll 6 may be used. Further, the screen take-up roll mechanism A may be provided on the left support shaft in addition to being provided on the left support shaft in a front view. In this case, the positional relationship between the double nut 12 and the second rotating body 10 and the winding direction of the spring 9 are assembled in the opposite direction to the case where the right nut is provided. Further, the screen winding roll mechanism A may be provided on both support shafts.

As shown in FIGS. 1 to 4, the take-up roll 6 is wound inside a take-up roll 6 that is cylindrical and made of metal (may be made of plastic having almost the same strength as metal). A support shaft 7 made of a rod and made of metal (which may be made of a plastic having substantially the same strength as metal) for rotatably supporting the roll 6 is provided, and one end side of the support shaft 7 and the support shaft 7 are provided. Between the rotating body 8 made of plastic and made of plastic (other materials such as metal) provided on the other end side of the winding roll 6 so as to be integrally rotatable. A coil spring 9, which may be made of plastic), and the screen 1 can be freely wound by driving and rotating the winding roll 6 using the return biasing force of the coil spring 9. It is composed. K shown in FIGS. 2 and 3 is a one-way clutch that allows the take-up roll 6 to rotate only in the pulling-out direction of the screen 1. However, when another stop mechanism is attached, the one-way clutch is omitted. May be.
Further, a second rotating body made of plastic in the shape of a disc that rotates with the rotation of the winding roll 6 on the other end side of the support shaft 7 (may be made of plastic having substantially the same strength as metal). The screw portion 11 for moving the shaft 10 in the axial direction is integrally formed (the screw portion formed separately may be externally fixed to the support shaft 7), and the winding roll 6 is rotated toward the winding side. A double nut 12 serving as a contact portion for restricting the screen winding completion position of the winding roll 6 by contacting the second rotating body 10 that moves the screw portion 11 is used as the screw portion of the support shaft 7. 11, and an end cap 13 made of plastic (or other material such as metal) is rotatably provided at the other end of the support shaft 7, and the second rotating body 10 is connected to the contact shaft 7. The coil spring is in contact with the abutment 12 and is A cylindrical shape that is externally rotatably integrated over the rotary body 8, the second rotary body 10, and the end cap 13 in a state where an urging force is applied, and that is internally mounted on the winding roll 6 so as to be integrally rotatable. A cylindrical body 14 made of metal (may be made of a plastic having substantially the same strength as metal) is provided to constitute the screen winding roll mechanism A.

  As shown in FIG. 4, the cylindrical body 14 has a larger outer diameter than the three parts having substantially the same outer diameter, that is, the rotating body 8, the second rotating body 10, and the end cap 13. In addition, the inner surface of the cylindrical member 14 contacts the outer peripheral surface of the three members 8, 10, 13 and protrudes inward to maintain the posture when the cylindrical body 14 is externally mounted and is axially In addition, a large number of long receiving portions 15 are provided at predetermined intervals in the circumferential direction, and are positioned between these two receiving portions 15 and 15 so as to protrude inward and to have a plate shape that is long in the axial direction. Are provided on the inner surface of the cylindrical body 14. Then, by projecting the cylindrical body 14 by moving the cylindrical body 14 from the axial direction to the rotary body 8, the second rotary body 10, and the end cap 13 provided on the support shaft 7, the protruding portion of the cylindrical body 14 is provided. The rotating body 8, the second rotating body 10, and the end cap 13 are provided with long grooves 8A, 10A, and 13A along the axial direction as engaged portions for engaging with 16 and allowing both to rotate. ing. The end cap 13 does not have to be formed on the end cap 13 without forming the long groove 13A. The exterior here refers to a case where a large number of receiving portions 15 of the cylindrical body 14 are in contact with the outer peripheral surfaces of the three members 8, 10, 13 and covered with no gaps (referred to as external fitting). However, it may be in a state where a large number of receiving portions 15 of the cylindrical body 14 are covered with some gaps without contacting the outer peripheral surfaces of the three members 8, 10, 13. A concave portion 14A along the axial direction is formed on the outer surface of the cylindrical body 14, and by projecting the casing 4 onto the cylindrical body 14, the inner surface of the casing 4 protrudes inward, and 4 A of convex parts formed along the axial direction engage with the recessed part 14A of the said cylindrical body 14, and the cylindrical body 14 rotates integrally with rotation of the casing 4. As shown in FIG. When the cylindrical body 14 rotates, the rotating body 8, the second rotating body 10, and the end cap 13 rotate integrally, and the second rotating body 10 moves in the axial direction by the screw portion 11 while rotating. It becomes.

  The procedure for assembling the screen winding roll mechanism will be described. First, one end of the coil spring 9 is penetrated and fixed to one end of the support shaft 7 and the other end is provided to the other end of the support shaft 7. 8 is engaged and held in a pair of grooves 8M, 8M formed in FIG. 8, and the parts K, 10, 12, 13 are respectively provided on the support shaft 7 and at the same time the cylindrical body 14 is inserted through the support shaft 7. (See FIG. 3). The state in which the second rotating body 10 is in contact with the double nut 12 is confirmed. If the second rotating body 10 is not in contact, the second rotating body 10 is rotated and is in contact with the double nut 12. In this state, by rotating the rotating body 8 in a predetermined direction (H direction in FIG. 3) a predetermined number of times with the support shaft 7 fixed (non-rotating state), an initial winding urging force is applied to the coil spring 9; While the cylindrical body 14 is externally attached (extrapolated) to the rotating body 8, the second rotating body 10, and the end cap 13 while maintaining this imparted state, the protruding portion 16 of the cylindrical body 14 is provided with the long grooves 8A, 10A, By engaging with 13A, the tubular body 14 is rotated by the return force of the coil spring 9, but the second rotating body 10 cannot contact the double nut 12 and rotate. 14 is prevented from rotating, and the coil spring is initially wound. When the cylindrical body 14 is packaged (extrapolated) in the order of the rotating body 8, the second rotating body 10, and the end cap 13, a flange portion that protrudes from the side surface of the end portion of the end cap 13. The end face of the cylindrical body 14 comes into contact with the end face of 13F, and the exterior of the cylindrical body 14 is completed. Next, after the cylindrical body 14 is packaged, the winding roll 6 is packaged (extrapolated) as shown in FIG. 14, the rotating body 10, the second rotating body 10, and the end cap 13 can be rotated together, and the assembly of the screen winding roll mechanism is completed. The direction in which the take-up roll 6 is packaged (extrapolated) may be opposite to the direction shown in FIG. Then, the screen 1 is wound around the screen winding roll mechanism assembled as described above, and then attached to the bracket 5. The rotating body 8 may be rotated in the direction opposite to the H direction, but in this case, the positional relationship between the second rotating body 10 and the double nut 12 is reversed left and right.

The support shaft of the screen winding roll mechanism assembled as described above is supported by the bracket 5 and then the screen 1 is pulled out against the initial urging force of the coil spring 9 so that the winding is performed as described above. When the take-up roll 6, the cylindrical body 14, the rotary body 10, the second rotary body 10, and the end cap 13 rotate and the coil spring 9 is twisted to increase the winding biasing force, the drawing operation is stopped. Stops at that position by a stop mechanism not shown. Thereafter, by releasing the stop mechanism for winding, the rotating body 10, the second rotating body 10, the end cap 13, the cylindrical body 14, and the winding roll 6 are rotated by the urging force of the coil spring 9, thereby causing the screen to rotate. 1 is wound, and the second rotating body 10 comes into contact with the double nut 12, so that the winding of the screen 1 is completed.
When the screen 1 is to be replaced with another screen 1 made of a different material, for example, the screen winding roll mechanism around which the screen 1 is wound is removed from the bracket 5 and another screen 1 is wound. The replacement work can be completed simply by attaching the screen winding roll mechanism to the bracket 5.

  The screen take-up roll mechanism of the present invention can be applied to a mechanism in which the handle 3 is pulled down to change the screen 1 in the stowed posture to the use posture, and the take-up roll using the electric force of the electric motor. By rotating the screen, the screen 1 can be applied to a screen whose posture can be changed between a storage posture and a use posture. The screen take-up roll mechanism of the present invention is particularly effective for a projection screen that needs to be replaced. However, the screen take-up roll mechanism can also be applied to a screen that is used for light shielding or heat insulation.

It is a schematic perspective view of the left side of the screen apparatus of the state which pulled out the screen. It is a longitudinal cross-sectional view which shows the structure of the winding roll mechanism for screens. It is a perspective view which shows the state just before assembling the winding roll mechanism for screens. It is a perspective view which shows the principal part of the winding roll mechanism for screens.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screen 2 Bar 3 Handle 4 Casing 4A Convex part 5 Bracket 6 Winding roll 7 Spindle 8 Rotating body 8M Groove 8A, 10A, 13A Long groove 9 Coil spring 10 2nd rotating body 11 Screw part 12 Double nut (contact part)
13F Flange part 13 End cap 13A Long groove 14A Recess 14 Cylindrical body 15 Receiving part 16 Projection part A Winding roll mechanism K for screen One-way clutch

Claims (4)

  A support shaft for rotatably supporting the take-up roll is provided in the take-up roll for winding up the screen, and the one end side of the support shaft and the other end side of the support shaft rotate integrally with the take-up roll. A coil spring is disposed between the rotator and a rotating body, and the screen is wound up by driving and rotating the winding roll using the return biasing force of the coil spring. In the screen take-up roll mechanism, the support shaft is provided with a screw portion for moving the second rotating body that rotates as the take-up roll rotates in the axial direction, to the take-up side of the take-up roll. A contact part for restricting a screen winding completion position of the winding roll by contacting the second rotating body that moves the screw part by rotation of the winding part, and the second rotating body Is in contact with the contact part and the front A cylindrical body that can be externally mounted in an integrally rotated state over the rotating body and the second rotating body in a state where initial winding biasing force is applied to a coil spring, and can be internally mounted in an integrally rotated state on the winding roll. A take-up roll mechanism for a screen characterized by comprising:   The screen winding roll mechanism according to claim 1, wherein an end cap is provided at the other end of the support shaft.   The screen winding roll mechanism according to claim 1, wherein the contact portion includes a double nut screwed into the screw portion. Protruding portions projecting inwardly on the inner surface side of the tubular body, and projecting portions of the tubular body by moving the tubular body from the axial direction to the rotating body and the second rotating body so as to be sheathed. The screen take-up roll mechanism according to any one of claims 1 to 3, wherein an engaged portion is provided on the rotating body and the second rotating body so as to be engaged with the rotating body.

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