JP2005113538A - Hoisting speed adjusting mechanism and screen device making use thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hoisting speed adjusting mechanism capable of making fine adjustment of a hoisting speed of a screen in a state to mount a screen device on the ceiling and a wall surface and to provide the screen device using it. <P>SOLUTION: A mechanism consisting of a fixed section formed of a side plate having a clutch drum and a rotational section concentrically rotating through the clutch drum are used for a speed adjusting mechanism adjusting a hoisting speed. The rotational section includes a driving section connected to a rotational shaft to which a coil spring is fixed and a dial section. While providing one or more engagement sections slidable to the main surface of a side plate to a basic body section of the driving section, a plurality of engagement receiving sections are provided in the circumferential direction of the side plate so that the engagement sections are detachable, and the rotation of the driving section is gradually varied by rotating the dial section to vary an engaging position of the engagement section stepwise vary to stepwise increase/decrease the amount rolled in a coil spring. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a winding speed adjusting mechanism and a screen apparatus using the same, and more particularly to a sheet-type winding speed adjusting mechanism and a suspension type screen apparatus using the same.

  An image from the projector is enlarged and projected on a reflective screen. And the suspension type screen device used by attaching to a ceiling or a wall generally uses a screen accommodated in a storage case by lowering it electrically or manually as required.

  In a suspended screen device, a screen wound around a spring roll, that is, a so-called roll screen is usually used, and the screen is wound up by utilizing the elastic force of a coil spring built in the spring roll. Here, the screen winding speed is usually adjusted by changing the winding torque of the coil spring after the initial winding. Conventionally, the initial winding has been performed by removing the spring roll from the screen device, but recently, a method in which the spring roll is attached to the screen device has been proposed (for example, Patent Documents 1 and 2). Patent Document 1 discloses an adjustment device having a dial for steplessly rotating a stator attached to one end of a coil spring, and a clutch that cooperates with the dial to lock the stator and the rotator and stop the screen at a predetermined position. Is described. In Patent Document 2, an adjustment device attached to one end of a coil spring is accommodated in one end of a winding pipe, and the base end of an adjustment shaft for operating the adjustment device is exposed on the side surface of the mounting bracket. An apparatus is described that adjusts the initial winding by rotating an adjustment shaft using a general-purpose tool.

Japanese Patent Publication No. 63-8269 Japanese Utility Model Publication No. 6-17995

  However, in any of the above methods, fine adjustment of the winding speed is insufficient. If the winding speed is too high, the underbar collides with the opening of the storage case or the screen is damaged due to winding disturbance, or the winding speed is low. If the screen is too large, the problem that the screen droops too much and cannot be accommodated in the storage case, or takes too much time to wind up has not been solved.

  Therefore, an object of the present invention is to provide a winding speed adjusting mechanism capable of finely adjusting the winding speed of the screen while the screen apparatus is attached to a ceiling or a wall surface, and a screen apparatus using the same.

  In order to solve the above-described problems, a winding speed adjusting mechanism according to the present invention includes a spring roll having a coil spring fixed to a rotating shaft, and a sheet-like shape having one end fixed to the spring roll and wound around the spring roll. A speed adjusting mechanism for adjusting a winding speed of a sheet-like scroll, which is used in a hanging-type scroll device having a scroll, and is concentrically arranged with a fixed portion made of a side plate having a clutch drum and the clutch drum. The rotating part includes a dial part and a driving part connected to the rotating shaft, and is slidable on the main surface of the side plate on the base part of the driving part. While providing one or more engaging portions, a plurality of engaging receiving portions are provided in the circumferential direction of the side plate so that the engaging portions can be engaged and disengaged, and the dial portion is rotated to engage the engaging portions. Position is changed stepwise rotation of the driving unit by stepwise changing the, characterized in that the amount winding of the coil spring and so as to stepwise increase and decrease.

  Further, the speed adjusting device of the present invention includes a rotating part, a clutch spring sequentially inserted on the clutch drum, a dial part including an adjusting drum and a dial, and a drive drum having a base part inserted inside the clutch drum. It is possible to use one that has a drive unit, releases the winding of the clutch spring around the clutch drum by turning the dial, and rotates the adjustment drum and the drive drum integrally.

  In the speed adjusting device of the present invention, the adjusting drum has an opening in the circumferential direction and the dial has a protruding portion protruding inward, and both ends of the clutch spring are placed in the opening of the adjusting drum. The dial portion can be configured by inserting the protruding portion of the dial between both ends of the clutch spring.

  The screen device according to the present invention includes a spring roll having a coil spring fixed to a rotating shaft, a screen having one end fixed to the spring roll and wound around the spring roll, and adjusting a screen winding speed. A suspension type screen device having a speed adjusting mechanism, the speed adjusting mechanism comprising a fixed portion made of a side plate having a clutch drum and a rotating portion rotating concentrically through the clutch drum. The rotating part includes a dial part and a driving part connected to the rotating shaft, and one or more engaging parts slidable on the main surface of the side plate are provided on the base part of the driving part. On the other hand, a plurality of engagement receiving portions are provided in the circumferential direction of the side plate so that the engagement portions can be engaged and disengaged, and the dial portion is rotated to set the engagement position of the engagement portions. To stepwise change the rotation of the driving unit by changing, characterized in that so as to the amount entrainment coil springs stepwise increased or decreased.

The speed adjusting mechanism of the present invention changes the rotation of the drive unit stepwise by a click operation that rotates the dial unit and changes the engagement position of the engagement unit of the drive unit stepwise, thereby winding the coil spring. Since the amount of loading is increased or decreased step by step, it is possible to finely adjust the winding speed of the scroll. As a result, for example, if the winding speed is too high, the screen may be damaged due to collision or turbulence in the storage case, or the winding speed may be too low to be stored in the storage case. It won't take too long.
Further, since the dial can be easily positioned by a click operation, for example, it is possible to adjust the winding speed very accurately as compared with the conventional stepless dial mechanism described in Patent Document 1, for example.
The speed adjusting mechanism can be suitably used not only for a screen device but also for a roll brand that unwinds and uses a sheet-like roll.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an example of the structure of the screen device 1 according to the present embodiment, and shows a state in which the screen is unwound. The screen device 1 is fixed to a ceiling or the like, and has a storage case 2, in which spring rolls (not shown) that are rotatably supported by brackets (not shown) are supported. ing. Moreover, a bracket cap (not shown) for protecting the bracket is attached to one end of the storage case 2 and attached to a speed adjusting mechanism 30 that adjusts the screen winding speed. One end of the screen 8 is fixed to the spring roll and wound around the spring roll, and the other end is fixed to the under bar 9. The screen 8 is unwound from the storage case 2 by the handle 10 during use, and is wound and stored in the storage case 2 during storage.

  FIG. 2 is a longitudinal sectional view taken along line II-II ′ of FIG. A bracket 4 whose surface is protected by a bracket cap 5 is fixed to one end of the storage case 2. On the other hand, a speed adjustment mechanism 30 is attached to the other end of the storage case 2. A rotating shaft 15 is built in one end of the spring roll 3, and the spring roll 3 rotates about the rotating shaft 15. A screen 8 having one end fixed thereto is wound around the pipe 5 of the spring roll 3, and an intermediate shaft 13 that rotates coaxially with the rotation shaft 15 is connected to the rotation shaft 15. ing. A coil spring 14 is wound around and fixed to the intermediate shaft 13 and applies an urging force in the rewinding direction to the spring roll 3. Here, one end of the coil spring 14 is locked by a screw 6 to a bearing portion 25 a that is integral with the frame body 20 of the clutch mechanism 25, and the other end is fixed to an end portion of the intermediate shaft 13. It is locked with a screw 7.

  The speed adjustment mechanism 30 includes a fixed portion including a side plate 32 having a clutch drum, and a rotating portion that rotates concentrically via the clutch drum. Further, the rotating part is composed of a dial part and a driving part. The dial part is composed of a clutch spring 33, an adjustment drum 34, and a dial 35 that are sequentially inserted on the clutch drum. The drive part is composed of a drive drum 31 that is inserted inside the clutch drum. The drive unit and the dial unit are integrated. The speed adjusting mechanism 30 and the clutch mechanism 25 are connected by fitting one end of the rotating shaft 15 of the clutch mechanism 25 inside the drive drum 31.

  3 is a cross-sectional view taken along the line III-III 'of FIG. The side plate 32 has a base portion 32 a and a clutch drum 32 b, and has a fixing hole 32 d for fixing to the bracket 4. The adjustment drum 34 has an opening 34 a in the circumferential direction, the dial 35 has a protrusion 35 a projecting from the inside, and both ends 33 a and 33 b of the clutch spring 33 are the openings of the adjustment drum 34. The clutch spring 33, the adjustment drum 34, and the dial 35 are extrapolated in this order so that the protrusion 35a of the dial is inserted between both ends 33a and 33b. Has been.

4 and 5 are schematic exploded perspective views showing the configuration of the speed adjustment mechanism. FIG. 4 is a view from the dial side and FIG. 5 is a view from the drive drum side to clarify the arrangement. Is shown. As shown in FIG. 4, the rotation shaft 15 of the clutch mechanism 25 is fitted inside the drive drum 31 to connect the drive drum and the clutch mechanism 25. Note that one end of the coil spring 14 is fixed to a bearing portion 25 a of the clutch mechanism 25. The drive drum 31 includes a base portion 31a and a drum portion 31d that rises from the base portion. The base 31a has four protrusions 31b, and a protrusion 31c is formed at the tip of the protrusion so as to face the side plate 32. Further, a plurality of convex portions 31e are formed as engaging portions in the circumferential direction on the upper surface of the drum portion 31d, and the engaging portions formed around the center hole 34b of the adjusting drum 34 as shown in FIG. The drive drum 31 and the adjustment drum 34 are integrated with each other by fitting into a plurality of recesses 34c as receiving portions.
4 and 5 show an example in which the convex portion 31e is used as the engaging portion of the drive drum and the concave portion 34c is used as the engaging receiving portion of the adjusting drum. Even if a convex portion is used as the receiving portion, the same effect is obtained.

  The adjustment drum 34 is extrapolated to the clutch spring 33, and both end portions 33a, 33b of the clutch spring are arranged so as to protrude into the opening 34a formed in the circumferential direction of the adjustment drum. Further, the dial 35 is extrapolated to the adjustment drum 34, and the protruding portion formed inside the dial 35 is disposed so as to be positioned between both end portions 33a and 33b of the clutch spring. Then, the drive drum 31 and the dial 35 are fixed by attaching a screw 36 to the screw receiving portion 35b via the side plate 32, the clutch spring 32, and the adjustment drum 34.

Here, a plurality of concave portions 32 c are formed in a circular shape at predetermined intervals on the opposite surface of the base portion 32 a of the side plate 32 to the clutch drum 32 b so that the protrusions 31 c of the drive drum 31 can be engaged and disengaged. When the drive drum 31 rotates, the protrusion 31c of the drive drum 31 slides on the opposite surface of the base portion 32a and the clutch drum 32b, and elastically contacts the recess 32c to generate a click feeling.
4 and 5 show an example in which the protrusion 31c is used as the engaging portion of the drive drum and the concave portion 32c is used as the engaging receiving portion of the side plate, but the concave portion and the engaging receiving portion are used as the engaging portion. Even if the protrusion is used, the same effect is obtained.

  The drive drum may be made of an elastic metal or resin material. In FIG. 4, the number of protrusions is four and a star-shaped drive drum is shown, but the number of protrusions is not particularly limited as long as it is two or more.

  Even if the dial 34 is rotated in any direction, the projecting portion 35a abuts one of the both end portions 33a and 33b of the clutch spring 33 and pushes the clutch spring 33 in the direction of rewinding. It is released. As a result, the clutch spring 33 rotates together with the adjustment drum 34. At this time, the drive drum 31 also rotates via the adjustment drum 34. During this rotation, the protrusion 31c of the drive drum 31 is disengaged from the recess 32c of the side plate and moves in the circumferential direction, and the drive drum 31 and the adjustment drum 34 rotate integrally. Then, when the rotation of the dial 35 is stopped at a position where the protrusion 31c of the drive drum 31 engages with another recess 32c, the dial 35 is fixed. On the other hand, for the rotation from the drive drum 31 side, the opening 34a of the adjustment drum 34 pushes both end portions 33a and 33b of the clutch spring 33 in the winding direction of the clutch spring 33. The drive drum 31 is prevented from rotating. Thereby, the rewinding of the coil spring due to the reaction when turning the dial 35 is stopped can be suppressed.

Moreover, although the clutch mechanism demonstrated below can be used for the screen apparatus of this invention, it is not limited to this. While the screen is allowed to be unwound, the screen is not particularly limited as long as it has a function of preventing unwinding of the unwound screen against the urging force of the spring roll in the winding direction.
As shown in FIG. 2, the clutch mechanism is composed of a driven portion made up of a drum 17 fitted on the outer side of the rotating shaft 15 and a driving portion made up of a frame body 20 fitted on the outer side of the drum 17. Is done. A bearing portion 25a integral with the frame body is provided at one end of the frame body 20, the intermediate shaft 13 is inserted, and one end of the coil spring 14 is locked to the bearing portion 25a. The frame 20 can be rotated via a bearing 16. The outer peripheral surface of the frame body 20 is provided with protrusions and protrusions (not shown) fitted to the protrusions and protrusions (not shown) provided on the inner surface of the spring roll 3 in the generatrix direction, Fits with the spring roll 3. Further, the rotating shaft 15 and the drum 17 are coupled to each other by a clutch spring 21 that is tightly wound around the rotating shaft 15 and whose tip is locked to the drum 17. As a result, when the screen 8 is unwound, the drum 17 rotates in the rewinding direction of the clutch spring 21 with respect to the rotating shaft 15, and the winding of the clutch spring 21 around the rotating shaft 15 and the drum 17 becomes weak. A rotation of 17 is allowed. As a result, the spring roll 3 rotates coaxially with the drum 17.
On the other hand, when the screen 8 is rewound, the drum 17 rotates in the tightening direction of the clutch spring 21 with respect to the rotation shaft 15, and the clutch spring 21 is more strongly wound around the rotation shaft 15 and the drum 17. Is prevented from rotating.

  The drum 17 has a guide groove 19 formed on the circumferential surface. The frame 20 is formed with a slide groove 20a having a semicircular cross section in the generatrix direction. A sliding ball 18 is disposed in the gap between the guide groove 19 and the slide groove 20a. When the frame body 20 rotates, the slide ball 18 moves in the slide groove 20a in the generatrix direction of the frame body 20. The guide groove 19 can be moved while moving. Here, the guide groove is preferably filled with a lubricant such as oil or grease. Since the lubricant reduces the rolling friction generated between the sliding ball and the guide groove, the screen can be unwound and unwound more easily. Further, since the lubricant gives rotational resistance to the sliding ball, the sliding ball is restrained from floating. Thereby, for example, when the screen is tilted, the sliding ball can be prevented from moving in the tilting direction of the screen, so that only the movement synchronized with the rotation of the frame can be made possible.

Hereinafter, the operation of the screen device according to the present embodiment will be described.
After attaching the screen device to the ceiling or wall, unwind and wind the screen, check the strength of the coil spring winding torque, wind the screen, and then wind the coil spring using the speed adjustment mechanism for the initial winding. Adjust the amount. For example, when the winding speed is low, when the dial is turned in the direction in which the coil spring is wound, the protruding portion of the dial comes into contact with one of both ends of the clutch spring and pushes the clutch spring in the direction of rewinding. The winding around the drum is released. As a result, the protrusion of the drive drum is disengaged from the recess of the side plate and moves in the circumferential direction. By rotating, the amount of winding of the coil spring can be increased stepwise. By increasing the number of concave portions of the side plate or narrowing the interval between the concave portions, it is possible to finely adjust the amount of winding.
On the other hand, when the dial is turned in the opposite direction, the drive drum can also turn the turning shaft in the opposite direction to reduce the amount of winding of the coil spring. As a result, the winding amount of the coil spring can be changed in a stepwise manner with the screen device attached, so that the screen winding speed can be easily adjusted.

  In the embodiment, an example has been described in which the drive drum can be rotated by extrapolating the clutch spring of the speed adjustment mechanism to the clutch drum and rewinding the clutch spring to release the winding around the clutch drum. However, as disclosed in Patent Document 2, for example, a method can be used in which a clutch spring is inserted into a clutch drum, and the clutch drum is wound and tightened to reduce the pressure-bonding force to the clutch drum and rotate the drive drum. .

It is a perspective view which shows an example of the structure of the screen apparatus which concerns on embodiment of this invention. It is a model longitudinal cross-sectional view in the II-II 'line cross section of FIG. FIG. 3 is a schematic cross-sectional view taken along the line III-III ′ of FIG. 2. It is a model exploded perspective view (1) which shows an example of the structure of the speed adjustment mechanism used for the screen apparatus of this invention. It is a model exploded perspective view (2) which shows an example of the structure of the speed adjustment mechanism used for the screen apparatus of this invention.

Explanation of symbols

1 screen device, 2 storage case, 3 spring roll, 4 bracket, 5 pipe, 6, 7 screw, 8 screen, 9 under bar, 10 handle, 12 spring roll cap, 13 intermediate shaft, 13a bearing, 14 coil spring, 15 Rotating shaft, 16 Bearing, 17 Drum, 17a Circulating groove, 17b Locking groove, 17c Protruding part, 18 Sliding ball, 19 Guide groove, 20 Frame body, 20a Slide groove, 21 Clutch spring, 25 Clutch mechanism, 25a Bearing part, 30 Speed adjustment mechanism, 31 Driving drum, 31a Base part, 31b Projection part, 31c Projection part, 31d Drum part, 32 Side plate, 32a Base part, 32b Clutch drum, 32c Recessed part, 32d Fixing hole, 33 Clutch spring 33a, 33b Both ends, 34 Adjustment drum , 34a opening, 34b center hole, 34c recess, 35 dial, 35a protrusion, 35b screw receiving part.

Claims (6)

Used in a suspended scroll device having a spring roll having a coil spring fixed to a rotating shaft, and a sheet-like roll wound around the spring roll with one end fixed to the spring roll. A speed adjustment mechanism for adjusting the winding speed of the scroll,
A fixed portion made of a side plate having a clutch drum;
Comprising a rotating part that rotates concentrically via the clutch drum, the rotating part comprising a dial part and a driving part connected to the rotating shaft,
One or more engaging portions slidable on the main surface of the side plate are provided on the base portion of the driving portion, and a plurality of engaging portions are detachable in the circumferential direction of the side plate. A receiving portion is provided, and the dial portion is rotated to change the engaging position of the engaging portion in a stepwise manner, thereby changing the rotation of the driving portion in a stepwise manner, thereby stepping up the coil spring winding amount. Winding speed adjustment mechanism that increases or decreases the speed.   The rotating part has a dial part composed of a clutch spring, an adjustment drum and a dial that are sequentially extrapolated to the clutch drum; and a drive part composed of a drive drum having a base part inserted inside the clutch drum, The speed adjusting device according to claim 1, wherein winding of the clutch spring around the clutch drum is released by turning of the dial, and the adjusting drum and the driving drum are rotated together.   The adjusting drum has an opening in the circumferential direction, the dial has a protruding portion protruding inward, and both ends of the clutch spring are inserted so as to protrude into the opening of the adjusting drum. 3. The speed adjusting device according to claim 2, wherein the dial portion is configured by inserting the protruding portion of the dial between both ends of the clutch spring. A suspension type having a spring roll having a coil spring fixed to a rotating shaft, a screen having one end fixed to the spring roll and wound around the spring roll, and a speed adjusting mechanism for adjusting a screen winding speed. Screen device,
The speed adjustment mechanism is composed of a fixed portion made of a side plate having a clutch drum and a rotating portion that rotates concentrically through the clutch drum,
The rotating part comprises a dial part and a driving part connected to the rotating shaft,
One or more engaging portions slidable on the main surface of the side plate are provided on the base portion of the driving portion, and a plurality of engaging portions are detachable in the circumferential direction of the side plate. A receiving portion is provided, and the dial portion is rotated to change the engaging position of the engaging portion in a stepwise manner, thereby changing the rotation of the driving portion in a stepwise manner, and the amount of winding of the coil spring is increased stepwise. A screen device that can be increased or decreased.   The rotating part has a dial part composed of a clutch spring, an adjustment drum and a dial that are sequentially extrapolated to the clutch drum; and a drive part composed of a drive drum having a base part inserted inside the clutch drum, The screen device according to claim 4, wherein the winding of the clutch spring on the clutch drum is released by the rotation of the dial, and the adjustment drum and the driving drum are rotated integrally. The adjusting drum has an opening in the circumferential direction, the dial has a protruding portion protruding inward, and both ends of the clutch spring are inserted so as to protrude into the opening of the adjusting drum. 6. The screen device according to claim 5, wherein the dial portion is configured by inserting the protruding portion of the dial between both end portions of the clutch spring.

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