CN101865221A - Reducing gear and projection screen rolling and releasing mechanism - Google Patents
Reducing gear and projection screen rolling and releasing mechanism Download PDFInfo
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- CN101865221A CN101865221A CN 200910131308 CN200910131308A CN101865221A CN 101865221 A CN101865221 A CN 101865221A CN 200910131308 CN200910131308 CN 200910131308 CN 200910131308 A CN200910131308 A CN 200910131308A CN 101865221 A CN101865221 A CN 101865221A
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- rotatingshaft
- clutch spring
- sheathed
- blade face
- interior
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Abstract
The invention discloses a reducing gear and a projection screen rolling and releasing mechanism. The reducing gear comprises a rotating shaft, a clutch spring, a sector and an external fixed sleeve body. The clutch spring is sheathed on the rotating shaft and is provided with a free end and a connecting end. The sector comprises an inner sleeve body and a plurality of flexible blades. The inner sleeve body is sheathed on the clutch spring and is provided with an external annular surface; wherein the connecting end of the clutch spring is connected to the inner sleeve body. The flexible blades are arranged on the external annular surface of the inner sleeve body. The external fixed sleeve body is sheathed on the sector. When the rotating shaft rotates along one rotating direction, the clutch spring and the rotating shaft are in tight fit, the rotating shaft drives the clutch spring to rotate and further the sector is driven to rotate along the rotating direction, and the flexible blades rub the external fixed sleeve body under the action of centrifugal force.
Description
Technical field
The present invention relates to a kind of speed reducer (decelerating device), and particularly relate to a kind of translucent screen reel releasing mechanism (projection screen rolling mechanism) of using this speed reducer.
Background technique
Optical projection apparatus now (optical projector), for example single rifle projector (single beam projector) and LCD projectors (LCD projector) can have been throwed the image (image) of high image quality and high brightness.In addition, it is close with the price of conventional television that optical projection apparatus has, and the little and advantage that is convenient for carrying of volume.Therefore, optical projection apparatus is little by little used by the mass society masses.
In large-scale speech occasion, optical projection apparatus is projeced into image on one projection screen (projection screen), watches information on the projection screen to make things convenient for spectators.In the prior art, a projection screen and a scrolling unit (rolling unit) constitute a translucent screen reel releasing mechanism jointly.One side of projection screen connects a spool (reel) of scrolling unit, and projection screen rolling is around in spool and exposes the opposite side of projection screen.When the user wanted to use projection screen, the user spurred the pull bar on the side that projection screen exposes, and makes projection screen stretch out gradually, and the torsion spring (torsional spring) that one of scrolling unit is connected to spool produces resiliently deformable.Then, user's side that fixedly projection screen exposed is for optical projection apparatus projection image.
When the user wanted to pack up projection screen, the user removed the stationary state of projection screen, and the restoring force of torsion spring will drive spool and rotate and projection screen is furled.Yet in the prior art, the rotational speed of spool is too fast, makes projection screen be easy to generate damage.
Summary of the invention
The object of the present invention is to provide a kind of speed reducer, it can produce decelerating effect.
Another object of the present invention is to provide a kind of translucent screen reel releasing mechanism, it has the above-mentioned speed reducer that produces decelerating effect.
Other purposes of the present invention and advantage can be further understood from the disclosed technical characteristics of the present invention.
For reaching one of above-mentioned or partly or entirely purpose or other purposes, one embodiment of the invention proposes a kind of speed reducer, comprises a rotatingshaft (rotational shaft), a clutch spring (clutch spring), a quadrant (fan-shaped body) and an outer fixing body (outer fixed sleeve).The clutch spring housing is located at rotatingshaft and is had a free end (free end) and a connecting end (connection end).Quadrant comprises body (inner sleeve) and a plurality of flexible blades (flexible blade) in one first.Body is sheathed on the clutch spring and has an outer ring surface (outer ring-shaped surface) in first, and wherein the connecting end of clutch spring is connected to body in first.These flexible blades are disposed on the outer ring surface of body in first.The outer fixing body is sheathed on quadrant and has annular surface (inner ring-shaped surface) in.
When rotatingshaft when one first sense of rotation is rotated, clutch spring and rotatingshaft are loose fit (loose fit).When rotatingshaft along one when second sense of rotation of first sense of rotation is rotated, clutch spring and rotatingshaft are drive fit (tight fit), rotatingshaft drives the clutch spring and rotates and then drive quadrant and rotates along second sense of rotation, and these flexible blades are subjected to action of centrifugal force to make each flexible blade outer fixing body that rubs.
For reaching one of above-mentioned or partly or entirely purpose or other purposes, one embodiment of the invention proposes a kind of translucent screen reel releasing mechanism, comprises above-mentioned speed reducer, a stationary axle (fixed shaft), a torsion spring and a projection screen.Rotatingshaft axially is connected to stationary axle rotationally.Torsion spring set is located at stationary axle.One end of torsion spring is connected to rotatingshaft, and the other end of torsion spring is connected to stationary axle.One side of projection screen is connected to rotatingshaft, and projection screen is suitable for the stationary axle of reeling.When projection screen is pulled, make rotatingshaft when one first sense of rotation is rotated, torsion spring produces resiliently deformable, and clutch spring and rotatingshaft are loose fit.When rotatingshaft be subjected to torsion spring the restoring force effect and along one when second sense of rotation of first sense of rotation is rotated, projection screen rolling is around in stationary axle, clutch spring and rotatingshaft are drive fit, rotatingshaft drives the clutch spring and rotates and then drive quadrant and rotates along second sense of rotation, and these flexible blades are subjected to action of centrifugal force to make each flexible blade outer fixing body that rubs.
Embodiments of the invention speed reducer and translucent screen reel releasing mechanism have following one of them or other advantages at least.When rotatingshaft when second sense of rotation is rotated, these flexible blades are subjected to action of centrifugal force to make each flexible blade friction outer fixing body, and then slow down the rotating speed of rotatingshaft, it is slack-off to make projection screen reclaim speed.Therefore, the projection screen of the translucent screen reel releasing mechanism of the speed reducer of application present embodiment can not produce damage in coiling process.
For the above-mentioned of embodiments of the invention and other purposes, feature and advantage can be become apparent, embodiment cited below particularly, and cooperate appended accompanying drawing, be described in detail below.
Description of drawings
Fig. 1 illustrates the schematic representation of a kind of translucent screen reel releasing mechanism of one embodiment of the invention;
Fig. 2 A illustrates the schematic representation of the speed reducer of Fig. 1;
Fig. 2 B illustrates the perspective exploded view of the speed reducer of Fig. 2 A;
Fig. 2 C illustrates another perspective exploded view of the speed reducer of Fig. 2 A;
Fig. 3 illustrates the generalized section of the speed reducer of Fig. 2 A along line A-A;
Fig. 4 A illustrates the generalized section of the projection screen speed reducer when pulled of present embodiment;
Speed reducer generalized section when the projection screen that Fig. 4 B illustrates present embodiment is furled.
The primary component symbol description
200: translucent screen reel releasing mechanism
210: speed reducer
212: rotatingshaft
212a: axis body
212b: body in second
212c: connecting base
214: coiled clutch spring
214a: free end
214b: connecting end
216: quadrant
216a: body in first
216b: flexible blade
218: the outer fixing body
220: stationary axle
230: torsion spring
240: projection screen
250: auxiliary runner
A1: the axis of rotatingshaft
D1: Hand of spiral
D2: first sense of rotation
D3: second sense of rotation
I1: the interior annular surface of outer fixing body
O1: the outer ring surface of body in first
S1: first side of flexible blade
S2: second side of flexible blade
S3: the interior blade face of flexible blade
S4: the outer blade face of flexible blade
Embodiment
About aforementioned and other technology contents, characteristics and effect of the present invention, in following cooperation embodiment's with reference to the accompanying drawings detailed description, can clearly present.The direction term of being mentioned in following examples, for example: upper and lower, left and right, front or rear etc. only are the directions with reference to attached drawings.Therefore, the direction term of use is to be used for illustrating not to be to be used for limiting the present invention.
Fig. 1 illustrates the schematic representation of a kind of translucent screen reel releasing mechanism of one embodiment of the invention.Fig. 2 A illustrates the schematic representation of the speed reducer of Fig. 1.Fig. 2 B illustrates the perspective exploded view of the speed reducer of Fig. 2 A.Fig. 2 C illustrates another perspective exploded view of the speed reducer of Fig. 2 A.Fig. 3 illustrates the generalized section of the speed reducer of Fig. 2 A along line A-A.This mandatory declaration be, for convenience of description for the purpose of, projection screen shown in Figure 1 (stating as follows) illustrates with dotted line.
Please refer to Fig. 1 and Fig. 2 A, Fig. 2 B, Fig. 2 C and Fig. 3, the translucent screen reel releasing mechanism 200 of present embodiment comprises a speed reducer 210, a stationary axle 220, a torsion spring 230, a projection screen 240 and an auxiliary runner (auxiliary rotation wheel) 250.Speed reducer 210 comprises a rotatingshaft 212, a clutch spring 214, a quadrant 216 and an outer fixing body 218.In the present embodiment, clutch spring 214 can be a coiled clutch spring 214.
Coiled clutch spring 214 is sheathed on the second interior body 212b of rotatingshaft 212.Coiled clutch spring 214 has a free end 214a and a connecting end 214b.In detail, coiled clutch spring 214 extends to connecting end 214b by free end 214a spirally along a Hand of spiral D1.In the present embodiment, coiled clutch spring 214 can be a left hand helix clutch spring.
In detail, in the present embodiment, each flexible blade 216b has a blade face S3 and an outer blade face S4 in one first side S1, the one second side S2, one.The outer ring surface O1 of body 216a and extend in the first side S1 contact first along the axis A1 of the axis body 212a of rotatingshaft 212.The second side S2 is close to an interior annular surface I1 of outer fixing body 218 and extends along axis A1.Interior blade face S3 connects the first side S1 and the second side S2.Outer blade face S4 and interior blade face S3 toward each other and outer blade face S4 be connected the first side S1 and the second side S2.In addition, interior blade face S3 is respectively a cambered surface with outer blade face S4.
Torsion spring 230 is sheathed on stationary axle 220.One end of torsion spring 230 is connected to the connecting base 212c of rotatingshaft 212, and the other end of torsion spring 230 is connected to stationary axle 220.In the present embodiment, torsion spring 230 can be a right-handed helix spring.In addition, auxiliary runner 250 is sheathed on stationary axle 220 rotationally.One side of projection screen 240 is connected to the connecting base 212c and the auxiliary runner 250 of rotatingshaft 212, and projection screen 240 stationary axle 220 that is suitable for reeling.
Below explain for the start process of the translucent screen reel releasing mechanism 200 of present embodiment.Fig. 4 A illustrates the generalized section of the projection screen speed reducer when pulled of present embodiment, the speed reducer generalized section the when projection screen that Fig. 4 B illustrates present embodiment is furled.Please refer to Fig. 1 and Fig. 2 A, Fig. 2 B, Fig. 2 C and Fig. 4 A, when projection screen 240 is pulled, make rotatingshaft 212 when one first sense of rotation D2 rotates, torsion spring 230 produces resiliently deformables, and coiled clutch spring 214 and rotatingshaft 212 second in body 212b be loose fit.At this moment, quadrant 216 can be rotated hardly.
Please refer to Fig. 1 and Fig. 2 A, Fig. 2 B, Fig. 2 C and Fig. 4 B, when rotatingshaft 212 be subjected to torsion spring 230 the restoring force effect and along one when the second sense of rotation D3 of the first sense of rotation D2 rotates, projection screen 240 is wound in stationary axle 220, and the second interior body 212b of coiled clutch spring 214 and rotatingshaft 212 is a drive fit.At this moment, rotatingshaft 212 second in body 212b drive coiled clutch spring 214 and rotate and then drive quadrant 216 and rotates along the second sense of rotation D3, and these flexible blades 216b is subjected to action of centrifugal force to make each flexible blade 216b outer fixing body 218 that rubs.Therefore, the rotating speed of rotatingshaft 212 slows down, and makes projection screen 240 can not produce damage because of the coiling process of translucent screen reel releasing mechanism 200.
In sum, embodiments of the invention speed reducer and translucent screen reel releasing mechanism have following one of them or other advantages at least.When rotatingshaft when second sense of rotation is rotated, these flexible blades are subjected to action of centrifugal force to make each flexible blade friction outer fixing body, and then slow down the rotating speed of rotatingshaft, it is slack-off to make projection screen reclaim speed.Therefore, the projection screen of the translucent screen reel releasing mechanism of the speed reducer of application present embodiment can not produce damage in coiling process.
Though disclosed the present invention in conjunction with above embodiment; yet it is not in order to limiting the present invention, anyly is familiar with this operator, without departing from the spirit and scope of the present invention; can do a little change and retouching, thus protection scope of the present invention should with enclose claim was defined is as the criterion.Arbitrary embodiment of the present invention in addition or claim must not reached the disclosed whole purposes of the present invention or advantage or characteristics.In addition, summary part and title only are the usefulness that is used for assisting the patent document search, are not to be used for limiting interest field of the present invention.
Claims (8)
1. speed reducer comprises:
Rotatingshaft;
The clutch spring is sheathed on this rotatingshaft and has a free end and a connecting end;
Quadrant comprises:
Body in first is sheathed on this clutch spring and has an outer ring surface, and wherein this connecting end is connected to this first interior body; And
A plurality of flexible blades are disposed on this outer ring surface of this first interior body; And
The outer fixing body is sheathed on this quadrant and has annular surface in;
When this rotatingshaft when one first sense of rotation is rotated, this clutch spring and this rotatingshaft are loose fit;
When this rotatingshaft along one when second sense of rotation of this first sense of rotation is rotated, this clutch spring and this rotatingshaft are drive fit, this rotatingshaft drives this clutch spring and rotates and then drive this quadrant and rotate along this second sense of rotation, and those flexible blades are subjected to action of centrifugal force to make respectively this flexible blade this outer fixing body that rubs.
2. speed reducer as claimed in claim 1, wherein this rotatingshaft comprises body in an axis body and one second, this second interior body is sheathed on this axis body regularly, and this clutch spring housing is located at this second interior body.
3. speed reducer as claimed in claim 1, wherein respectively this flexible blade has a blade face and an outer blade face in one first side, one second side,, this outer ring surface of this body in first of this first contacts side surfaces and extend along an axis of this rotatingshaft, this second side is close to the interior annular surface of being somebody's turn to do of this outer fixing body and extends along this axis, should connect this first side and this second side in interior blade face, should outer blade face with should in the blade face toward each other and be connected this first side and this second side, and should interior blade face and be somebody's turn to do outer blade face and be respectively a cambered surface.
4. speed reducer as claimed in claim 1, wherein the clutch spring comprises a helical spring.
5. translucent screen reel releasing mechanism comprises:
Stationary axle;
Speed reducer comprises:
Rotatingshaft, rotary axis of earth is to being connected to this stationary axle;
The clutch spring is sheathed on this rotatingshaft and has a free end and a connecting end;
Quadrant comprises:
Body in first is sheathed on this clutch spring and has an outer ring surface, and wherein this connecting end is connected to this first interior body; And
A plurality of flexible blades are disposed on this outer ring surface of this first interior body; And
The outer fixing body is sheathed on this quadrant and has annular surface in;
Torsion spring is sheathed on this stationary axle, and wherein an end of this torsion spring is connected to this rotatingshaft, and the other end of this torsion spring is connected to this stationary axle; And
Projection screen, wherein a side of this projection screen is connected to this rotatingshaft, and this projection screen this stationary axle that is suitable for reeling;
When this projection screen is pulled, make this rotatingshaft when one first sense of rotation is rotated, this torsion spring produces resiliently deformable, and this clutch spring and this rotatingshaft are loose fit;
When this rotatingshaft be subjected to this torsion spring the restoring force effect and along one when second sense of rotation of this first sense of rotation is rotated, this projection screen rolling is around in this stationary axle, this clutch spring and this rotatingshaft are drive fit, this rotatingshaft drives this clutch spring and rotates and then drive this quadrant and rotate along this second sense of rotation, and those flexible blades are subjected to action of centrifugal force to make respectively this flexible blade this outer fixing body that rubs.
6. translucent screen reel releasing mechanism as claimed in claim 5, wherein this rotatingshaft comprises body and a connecting seat in the axis body, one second, this second interior body is sheathed on an end of this axis body regularly, this clutch spring housing is located at this second interior body, this connecting base is sheathed on the other end of this axis body regularly, this connecting base is sheathed on an end of this stationary axle rotationally, and this torsion spring is connected to this connecting base of this rotatingshaft.
7. translucent screen reel releasing mechanism as claimed in claim 5, wherein respectively this flexible blade has one first side, one second side, a blade face and an outer blade face in one, this outer ring surface of this body in first of this first contacts side surfaces and extend along an axis of this rotatingshaft, this second side is close to the interior annular surface of being somebody's turn to do of this outer fixing body and extends along this axis, should connect this first side and this second side in interior blade face, should outer blade face with should in the blade face toward each other and be connected this first side and this second side, and should interior blade face and be somebody's turn to do outer blade face and be respectively a cambered surface.
8. translucent screen reel releasing mechanism as claimed in claim 5, wherein the clutch spring comprises a helical spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910131308 CN101865221A (en) | 2009-04-14 | 2009-04-14 | Reducing gear and projection screen rolling and releasing mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910131308 CN101865221A (en) | 2009-04-14 | 2009-04-14 | Reducing gear and projection screen rolling and releasing mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101865221A true CN101865221A (en) | 2010-10-20 |
Family
ID=42957080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910131308 Pending CN101865221A (en) | 2009-04-14 | 2009-04-14 | Reducing gear and projection screen rolling and releasing mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101865221A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106481694A (en) * | 2015-09-02 | 2017-03-08 | 德昌电机(深圳)有限公司 | Fluid drive apparatus, electric machine assembly and its centrifugal friction clutch |
| CN107701620A (en) * | 2017-10-11 | 2018-02-16 | 无锡英倍思机械有限公司 | Brake gear for automated machine |
| CN110133955A (en) * | 2019-05-14 | 2019-08-16 | 西安电子科技大学 | A kind of projection device applied in telecommunications field |
| CN111946759A (en) * | 2020-08-07 | 2020-11-17 | 倪荷春 | Brake mechanism of cableway slider |
-
2009
- 2009-04-14 CN CN 200910131308 patent/CN101865221A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106481694A (en) * | 2015-09-02 | 2017-03-08 | 德昌电机(深圳)有限公司 | Fluid drive apparatus, electric machine assembly and its centrifugal friction clutch |
| CN107701620A (en) * | 2017-10-11 | 2018-02-16 | 无锡英倍思机械有限公司 | Brake gear for automated machine |
| CN110133955A (en) * | 2019-05-14 | 2019-08-16 | 西安电子科技大学 | A kind of projection device applied in telecommunications field |
| CN111946759A (en) * | 2020-08-07 | 2020-11-17 | 倪荷春 | Brake mechanism of cableway slider |
| CN111946759B (en) * | 2020-08-07 | 2022-08-23 | 倪荷春 | Brake mechanism of cableway slider |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Open date: 20101020 |