TW202409404A - Deceleration and position limiting device of roller blind instantly generating buffer deceleration effect to reduce impact force and noise and preventing parts from being damaged - Google Patents

Abstract

A deceleration and position limiting device of roller blind is provided. The deceleration and position limiting device comprises a position limiting deceleration sleeve, a position limiting deceleration elastic member sleeved to a side of the position limiting deceleration sleeve, a rotator provided for fastening another side of the position limiting deceleration elastic member, a position limiting turning body engaging and interlocking with the rotator and driving the rotator to rotate and displace, and a fixed shaft member provided for the position limiting turning body and the rotator to rotate and move and fixed inside the position limiting deceleration sleeve. With the fixed shaft member, when a roller blind is wound to an upper position limit, the position limiting turning body rotates to engage and interlock the rotator and drives the rotator to rotate and displace such that the rotator then drives the twist state of the position limiting deceleration elastic member connected and fixed with the rotator. Accordingly, the buffer deceleration effect is instantly generated to reduce impact force and noise when the roller blind is wound to the upper positon limit.

Description

Roller blind deceleration limiter

The present invention relates to a deceleration position limiting device, in particular to a deceleration position limiting device for a roller shutter.

The roller blinds in the market are not equipped with suitable upper limit devices and lower limit devices. When the curtain piece of the roller blind is pulled down, it may cause the curtain piece to be stretched too long. On the contrary, the curtain piece of the roller blind is pulled upward. When retracting, the retracting force generated will be excessive and turn over to the other side of the upper rail.

Therefore, the industry has designed a roller blind equipped with upper and lower limit devices. The roller blind can be pulled to the lower limit. Especially when the roller blind reaches the upper limit of rolling, the impact force generated is large and the noise is also loud. For example, the rolling shutter patent No. I772122 of the Republic of China Patent Announcement is disclosed. Please refer to Figures 1 and 2. The rolling shutter 1 includes an upper rail 11 and a rolling shutter installed on one side of the upper rail 11. Device 12, a limiting device 13 installed on the other side of the upper rail 11, and two fixed brackets 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, and 2 fixed to the upper rail 11 on both sides of the upper rail 11, respectively. A lower rail 15 is spaced below the upper rail 11, and a curtain 16 is provided. The user lowers the lower rail 42 of the curtain 16 to the lower limit stop point A. When the curtain 16 is rolled up, the lower rail 15 of the curtain 16 reaches the upper limit stop point A1. The instantaneous impact force and noise are large, and over time, the internal parts of the limiting device 13 will be damaged.

The main purpose of the present invention is to solve the existing problems caused by the large impact force and loud noise generated instantly when the curtain is rolled up to the upper limit of the lower rail, causing damage to the internal parts of the limiting device.

In order to achieve the above object, the present invention provides a deceleration limiter device for a roller blind. The deceleration limiter device includes a limit deceleration sleeve, a limit deceleration elastic member, a rotator, a limit rotation body, and a fixed shaft. Part; wherein the limiting deceleration sleeve includes a convex cover wall with a first opening and a convex rod extending from one side of the convex cover wall and having a second opening, and the convex cover wall and the convex rod side are formed A first chamber is connected to the first opening, a first shaft hole with a first fixing part is formed in the lug rod, and a first shaft hole is formed in the lug rod to connect the second opening, the first shaft hole and the first A second chamber with an opening, and a first protruding block is protruding from the end of the protruding rod; one side of the limiting deceleration elastic member is sleeved on one side of the limiting deceleration sleeve, and the other side is fixed on the rotator one side, and telescopes between the limiting deceleration sleeve and the rotator; the rotator is used to fix the other side of the limiting deceleration elastic member, the rotator includes a protruding body, and opposite to the protruding body A latch part on one side, wherein the protruding body has a third opening, and a third chamber connected to the third opening is formed in the protruding body, and a second chamber is provided at the end of the third chamber. The second protrusion is locked correspondingly with the first protrusion. The latch portion includes a second axis hole and an internal space separated by an annular protrusion that communicates with the third chamber and the third opening. , a first resisting portion connecting the annular convex body and the latch portion, and at least one socket formed in the inner space of the latch portion for inserting and positioning the other side of the limiting deceleration elastic member, the The second shaft hole has a first threaded part; the limiting rotor is movably screwed to the fixed shaft member, the limiting rotary body has a third shaft hole with a second threaded part, and at least one limiting groove. , both sides of the limiting rotor have a second resisting portion and a third resisting portion formed in the limiting groove and opposite to each other, wherein the second resisting portion of the limiting rotor correspondingly engages the rotator The first resisting portion; the fixed shaft is used for the rotational movement of the limiting rotor and the rotator and is fixed internally with the limiting reduction sleeve. The fixed shaft includes a shaft, a convex ring body, and a third thread part and a second fixing part, wherein the convex ring body is provided with a fourth resisting part on one side from the direction of the third threaded part, and the fourth resisting part corresponds to the third resisting part of the limiting rotary body. part, the third threaded part engages the second threaded part of the limiting rotor and the first threaded part of the rotator, the second fixed part is connected to the third threaded part, and the second fixed part is connected with the The first fixed part is correspondingly engaged; through the fixed shaft member, when a roller blind is rolled up to the upper limit, the limiting swivel rotates to lock with the rotator and drives the rotator to rotate and displace, so that the rotor Then, the limit deceleration elastic member connected and fixed with the rotator is driven to a twisting state, so that the roller blind can instantly produce a buffering and deceleration effect when it is rolled up to the upper limit.

Furthermore, the convex rod has a first rod body connected to one side of the convex cover wall and with an outer diameter smaller than the outer diameter of the convex cover wall, and a first rod body connected to one side of the first rod body and screwed to the limiting deceleration elastic member. A second rod body with an external thread, and a third rod body connected to one side of the second rod body and with an outer diameter smaller than the outer diameter of the second rod body, the outer peripheral edge of the second rod body from one side to the other side The taper has a tapered shape and the outer diameter is larger than the outer diameter of the first rod body.

Furthermore, one side and the other side of the position-limiting and decelerating elastic member form a first penetration space and a second penetration space, the first penetration space is for the second rod to penetrate, and the second penetration space is for one side of the rotator to penetrate.

Furthermore, a convex block is provided on the outer periphery of the protruding body of the rotator, which forms a distance with the latching portion and limits the position-limiting and deceleration elastic member.

Furthermore, the limit deceleration elastic member is a spring.

Furthermore, the first resisting part, the second resisting part, the third resisting part and the fourth resisting part are bumps.

Furthermore, the first fixing portion is a protrusion; wherein the outer surface of the second fixing portion has a groove corresponding to and engaged with the first fixing portion.

Furthermore, the shaft has a fourth shaft hole. The fourth shaft hole is a hexagonal hole, and a fixing member is penetrated and fixed on the outer periphery of the shaft.

Through the foregoing implementation of the present invention, it has the following characteristics compared with the existing ones:

In the present invention, through the fixed shaft of the deceleration limiting device, when the roller blind is rolled up to the upper limit, the limiting swivel rotates to lock with the rotator and drives the rotator to rotate and move, so that the rotation The device then drives the limit deceleration elastic piece fixedly connected to the rotator to twist, and makes the limit deceleration elastic piece have a greater torsional elasticity, so that the roller blind can instantly produce a buffering and deceleration effect when it is rolled up to the upper limit. Reduce impact force and noise and avoid damage to parts inside the deceleration limiter.

The detailed description and technical contents of the present invention are now described as follows with reference to the accompanying drawings:

Please refer to Figures 3 and 4. The present invention provides a deceleration limiting device for a roller blind. In this embodiment, the roller blind 2 includes an upper rail 20, an upper rail 20, and an upper rail 20. The roller blind device 3 on the side, a roll-up control device 4 installed in the upper rail 20 and on the side opposite to the roller blind device 3, and a roll-up control device installed in the upper rail 20 and connected to the roll-up control device The deceleration limiters 5 and 2 on one side of 4 are respectively used for the axial connection between the roller blind device 3 and the retracting control device 4 and are provided with fixed brackets 6 fixed on both sides above the window. A spacer is provided on the upper rail 20 The lower rail 23 below, and a curtain 7. The upper rail 20 is provided with a limiting protrusion 21. The limiting protrusion 21 is used for the assembly and fixation of the rolling shutter device 3, the deceleration limiting device 5 and the retraction control device 4. The limiting protrusion 21 is There is an inlay groove 22 above 21, and the inlay groove 22 is for a starting end 71 of the curtain piece 7 to be embedded and wound on the outer surface of the upper rail 20, so that the curtain piece 7 is driven by the upper rail 20 to move up and down. The surface of the lower rail 23 is provided with a channel 231, and the channel 231 is for a terminal end 72 of the curtain 7 to be inserted and fixed.

A square fixing post 31 is provided on one side of the rolling curtain device 3, and the fixing post 31 is pivotally connected to the fixing bracket 6 at the left end. A coil spring 30 is provided on the other side of the rolling curtain device 3, and the coil spring 30 will be rolled up and tightened when the curtain sheet 7 is rotated and pulled downward by the upper rail 20. The rolling curtain device 3 is a known component and will not be described in detail here.

One side of the retraction control device 4 is provided with a square first convex shaft 41. The first convex shaft 41 is axially connected to and extends out of the fixed bracket 6 at the right end. The other side end of the retraction control device 4 A hexagonal second convex shaft 42 is provided. The retraction control device 4 is a conventional component and will not be described in detail here.

Referring again to FIGS. 3 to 6 and 11, the deceleration limit device 5 includes a limit deceleration sleeve 51, a limit deceleration elastic member 52 disposed on one side of the limit deceleration sleeve 51, a rotator 53 fixed to the other side 522 of the limit deceleration elastic member 52, a limit rotator 54 formed with the rotator 53 and driving the rotator 53 to rotate and move, and a fixed shaft 55 for the limit rotator 54 and the rotator 53 to rotate and move and fixed to the inside of the limit deceleration sleeve 51.

Referring back to Figures 3 to 6 and 11, the limiting reduction sleeve 51 includes a convex cover wall 511 with a first opening 512, and a second opening 514 extending from one side of the convex cover wall 511. A convex rod 513, the convex rod 513 has a first rod body 515 connected to one side of the convex cover wall 511 and with an outer diameter smaller than the outer diameter of the convex cover wall 511. It is connected to one side of the first rod body 515 and has a A second rod body 516 with external threads 5161, and a third rod body 517 connected to one side of the second rod body 516 and having an outer diameter smaller than the outer diameter of the second rod body 516. The convex cover 511 and the first rod 515 form a first chamber 518 connected to the first opening 512. The outer peripheral edge of the second rod 516 is tapered from one side to the other and is tapered. The outer diameter is larger than the outer diameter of the first rod 515, and a first shaft hole 5162 with a first fixing part 5163 is formed in the second rod 516, and a first shaft hole 5162 is formed in the third rod 517 to communicate with the second fixing part 5163. The opening 514, the first shaft hole 5162 and a second accommodation chamber 519 of the first opening 512, and a first protruding stop 5171 is protruding from the end of the third rod body 517. In one embodiment, the first fixing part 5163 is a convex body.

Referring again to FIGS. 3 to 6 and in conjunction with FIGS. 11 and 14, one side 521 of the position-limiting and deceleration elastic member 52 is sleeved on the first rod body 515 of the convex rod 513 and abuts against the convex cover wall 511, and the other side 522 is fixed to one side of the rotator 53, and stretches between the position-limiting and deceleration sleeve 51 and the rotator 53, and a first penetration space 523 and a second penetration space 524 are formed through the one side 521 and the other side 522 of the position-limiting and deceleration elastic member 52, the first penetration space 523 is for the second rod body 516 to penetrate, and the second penetration space 524 is for one side of the rotator 53 to penetrate. The position-limiting deceleration elastic member 52 is a spring in this embodiment, and a gap 525 is formed between each circle of the spring. Through these gaps 525, the position-limiting deceleration elastic member 52 is compressed by the rotator 53 during rotation and movement, and also has a buffering and deceleration force when the roller curtain 2 is rolled up, and the position-limiting deceleration elastic member 52 has a larger torsional elastic force. In this embodiment, the position-limiting deceleration elastic member 52 is provided with two circles of buffering and deceleration space.

Referring again to Figures 3 to 7 and in conjunction with Figures 13 and 14, the rotator 53 is used to fix the other side 522 of the limit deceleration elastic member 52. The rotator 53 includes a protrusion 531 and a latch portion 532 on a side opposite to the protrusion 531. The protrusion 531 has a third opening 533, and a third chamber 534 connected to the third opening 533 is formed in the protrusion 531, and a second convex stop 5341 is provided at the end of the third chamber 534, and the second convex stop 5341 is correspondingly locked with the first convex stop 5171; when the rotator 53 is screwed to the fixed shaft 55, it is driven by the limit rotator 54 and rotates. During displacement, the protrusion 531 penetrates from the second penetration space 524, so that the third chamber 534 of the protrusion 531 is inserted into the third rod 517, until the second convex stop 5341 and the first convex stop 5171 of the third rod 517 form a corresponding stop, so that the roller blind 2 is rolled up to the highest point of the lower rail 23, i.e., the so-called upper limit stop point D, and a buffering and deceleration effect is instantly generated. A convex stop block 5311 is provided on the outer periphery of the protrusion 531, which forms a distance 5312 with the latch portion 532 and limits the limit deceleration elastic member 52. The latch portion 532 includes a second axial hole 535 and an inner space 536 separated by an annular protrusion 5321 and connecting the third chamber 534 and the third opening 533, a first blocking portion 537 connecting the annular protrusion 5321 and the latch portion 532, and at least one insertion hole 5361 formed in the inner space 536 of the latch portion 532. The second axial hole 535 has a first threaded portion 538. In this embodiment, there are four insertion holes 5361. The insertion hole 5361 is used for inserting and positioning the other side 522 of the position-limiting deceleration elastic member 52 (as shown in FIG. 12 ), so that a circle body adjacent to the other side 522 of the position-limiting deceleration elastic member 52 is inserted into the spacing 5312 , and the convex block 5311 blocks and restricts the other side 522 of the position-limiting deceleration elastic member 52 from falling off.

Referring again to FIGS. 3 to 6 and FIGS. 10 to 12, the position-limiting rotating body 54 is movably threadedly connected to the fixed shaft 55 and is coupled to the upper rail 20, and the position-limiting rotating body 54 is driven by the upper rail 20 to rotate and move along the fixed shaft 55. The position-limiting rotating body 54 has a third shaft hole 541 of a second threaded portion 542 and at least one position-limiting groove 543, and the position-limiting groove 543 corresponds to the position-limiting protrusion 21 of the upper rail 20, so that the upper rail 20 can drive the position-limiting rotating body 54 to rotate and move along the fixed shaft 55 in cooperation with the position-limiting protrusion 21 of the upper rail 20. The two sides of the limiting rotator 54 have a second abutment portion 544 and a third abutment portion 545 formed in the limiting groove 543 and opposite to each other, wherein the second abutment portion 544 of the limiting rotator 54 corresponds to the first abutment portion 537 of the rotator 53 and drives the rotator 53 to rotate and move.

Referring back to Figures 3 to 8 and 9, the fixed shaft 55 is used for the rotational movement of the limiting rotary body 54 and the rotator 53 and is fixed internally with the limiting reduction sleeve 51. The fixed shaft member 55 includes a shaft 551, a convex ring body 552, a third threaded part 553 and a second fixed part 554. The shaft 551 has a fourth shaft hole 5511, and the fourth shaft hole 5511 is The hexagonal hole is for the second convex shaft 42 of the retraction control device 4 to be inserted into and fixed with a fixing member 5512 on the outer periphery of the shaft 551 . A fourth resisting portion 555 is provided on one side of the convex ring body 552 in the direction of the third threaded portion 553 . The fourth resisting portion 555 corresponds to the third resisting portion 545 of the limiting rotor 54 . The third threaded portion 553 engages the second threaded portion 542 of the limiting rotor 54 and the first threaded portion 538 of the rotator 53, and the third threaded portion 553 is used for the limiting rotary body 54 and the rotator. 53 rotation movement. The second fixing part 554 is connected to the third threaded part 553, and the outer surface of the second fixing part 554 has a groove 5541, which is correspondingly engaged and fixed with the first fixing part 5163 as a convex body. In one embodiment, the first resisting part 537, the second resisting part 544, the third resisting part 545 and the fourth resisting part 555 are bumps.

Referring again to Figures 3 and 4, the fixing brackets 6 are fixed on both sides above the window. The fixing brackets 6 respectively include a fixing body 61 installed on one of the two sides above the window and a vertical frame body 62 connected below the fixing bodies 61 . Each of the vertical frames 62 is respectively provided with a through hole 621 for the fixing column 31 of the roller blind device 3 and the first convex shaft 41 of the retraction control device 4 to penetrate and position.

Please refer to Figures 3 and 7 to 12. When the user wants to unfold the curtain piece 7 of the roller blind 2, the upper rail 20 rotates and the lower rail 23 drops downward to the lower limit stop point B. , the upper rail 20 can drive the rolling shutter device 3, the retracting control device 4, and the limiting groove 543 of the limiting rotor 54 to rotate along the limiting protrusion 21. The third resisting portion 545 engages and stops with the fourth resisting portion 555 of the fixed shaft member 55 (as shown in Figures 8 and 9); on the contrary, the present invention uses the third threaded portion of the fixed shaft member 55 to 553, when the roller blind 2 is rolled up to the lower rail 23 to the upper limit C (as shown in Figure 7), the second threaded portion 542 of the limiting rotor 54 engages the third portion of the fixed shaft member 55. The three-threaded portion 553 rotates and moves from the direction of the rotor 53. When the limiting rotor 54 is pushed against the rotor 53, the second resisting portion 544 of the limiting rotor 54 and the third end of the rotor 53 A resisting portion 537 engages and stops and drives the rotator 53 to rotate and displace (as shown in Figures 10 to 12), so that the rotor 53 drives the limiting deceleration elastic member 52 fixedly connected to the rotor 53 to a twisted state. , driving the protruding body 531 of the rotator 53 to rotate from the second penetration space 524 and compress the limiting deceleration elastic member 52, then when the limiting deceleration elastic member 52 is rotated by the rotor 53, The compression also has a buffering and decelerating force that assists the roller blind 2 when it is retracted, and makes the limiting decelerating elastic member 52 have a greater torsional elasticity, because the limiting decelerating elastic member 52 is twisted in the first round of buffering. When the deceleration space is reached, the second protrusion 5341 of the rotor 53 and the first protrusion 5171 of the limiting deceleration sleeve 51 will not engage. When the limiting deceleration elastic member 52 is twisted for the second round of the buffer, When the deceleration space is reached, the protruding body 531 of the rotator 53 continues to rotate and move from the direction of the third rod body 517, so that the third accommodation chamber 534 of the protruding body 531 is inserted into the third rod body 517 until The second protrusion 5341 of the rotator 53 and the first protrusion 5171 of the limiting deceleration sleeve 51 form an engaging stop (as shown in Figures 13 and 14) for the roller blind 2 to be rolled up to the lower position. The highest point of the rail 23, which is the so-called upper limit stop point D, instantly produces a buffering and decelerating effect (as shown in Figure 7) to reduce impact force and noise and avoid damage to the internal parts of the deceleration limiter 5.

However, the foregoing are only preferred embodiments of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly, and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications to the shape, structure and features described in the scope of the present invention shall be included in the patent scope of the present invention.

(Existing) 1: Roller curtain 11: Upper rail 12: Roller curtain device 13: Limit device 14: Fixed bracket 15: Lower rail 16: Curtain A: Stop point of lower limit A1: Stop point of upper limit (Present invention) 2: Roller curtain 20: Upper rail 21: Limit convex body 22: Embedded groove 23: Lower rail 231: Channel 3: Roller curtain device 30: Coil spring 31: Fixed column 4: Winding control device 41: First cam 42: Second cam 5: Speed reduction limit device 51: Speed reduction sleeve 511: Convex cover wall 512: first opening 513: convex rod 514: second opening 515: first rod 516: second rod 5161: external thread 5162: first axial hole 5163: first fixing portion 517: third rod 5171: first convex stopper 518: first chamber 519: second chamber 52: limit deceleration elastic member 521: one side 522: other side 523: first through-space 524: second through-space 525: gap 53: rotator 531: protrusion 5311: convex stopper 5312: spacing 532: latching portion 5321: annular convex body 533: third opening 534: third chamber 5341: second convex block 535: second axial hole 536: internal space 5361: plug hole 537: first blocking portion 538: first threaded portion 54: position-limiting swivel 541: third axial hole 542: second threaded portion 543: position-limiting groove 544: second blocking portion 545: third blocking portion 55: fixed shaft 551: shaft 5511: fourth axial hole 5512: fixing member 552: convex ring body 553: third threaded portion 554: second fixing portion 5541: groove 555: Fourth stop 6: Fixed bracket 61: Fixed body 62: Stand 621: Through hole 7: Curtain 71: Starting end 72: End B: Stop point of lower limit C: Upper limit D: Stop point of upper limit

Figure 1: A three-dimensional exploded view of the roller blind configuration of the Republic of China Patent Publication No. I772122. Figure 2: A three-dimensional schematic diagram of the roller blind of Figure 1 being rolled up. Figure 3: A three-dimensional exploded view of the deceleration limit device of the roller blind of the present invention. Figure 4: A three-dimensional diagram of the assembly of the roller blind of the present invention. Figure 5: A three-dimensional exploded view of the deceleration limit device of the present invention. Figure 6: A three-dimensional exploded view of the deceleration limit device of Figure 5 from another angle. Figure 7: A three-dimensional schematic diagram of the roller blind of Figure 4 being rolled up. Figure 8: A schematic diagram of the lower rail of the roller blind being unfolded to the lower limit and the limit swivel being about to rotate in Figure 7. Figure 9: A side view of the engagement between the limit swivel and the fixed shaft in Figure 8. Figure 10: A front view of the lower rail of the retractable roller blind in Figure 7 approaching the upper limit position and the engagement between the limit swivel and the rotator. Figure 11: A cross-sectional view of the engagement between the limit swivel and the rotator in Figure 10. Figure 12: A side view of the engagement between the limit swivel and the rotator in Figure 10. Figure 13: A front view of the engagement between the lower rail of the retractable roller blind in Figure 7 reaching the upper limit position and the limit speed reduction sleeve and the rotator. Figure 14: A cross-sectional view of the engagement between the limit speed reduction sleeve and the rotator in Figure 13.

5: Speed reduction limit device

51:Limited reduction sleeve

511: Convex wall

512:First opening

513: Convex rod

5162: First shaft hole

5163:First fixed part

518:The first room

52: Limit deceleration elastic piece

521: One side

522:The other side

523: The first penetration space

53: Rotator

531: Protrusion

5311:Protruding stop

5312: Spacing

532: latch part

533:The third opening

534: The third chamber

535: Second shaft hole

5361:jack

537: First stop

538: First thread part

54:Limited rotation

541: Third shaft hole

542: Second thread part

543: Limiting slot

544: Second blocking part

545:Third Resistance Department

55: Fixed shaft parts

551: Shaft

5512:Fixers

552: convex ring body

553: Third thread section

554: Second fixed part

5541: Groove

555:Fourth Resistance Department

Claims (8)

A speed reduction and limiting device for a roller blind, the speed reduction and limiting device comprises a speed reduction sleeve, a speed reduction elastic member, a rotator, a speed reduction swivel, and a fixed shaft; wherein the speed reduction sleeve comprises a convex cover wall with a first opening and a convex rod extending from one side of the convex cover wall and having a second opening, a first accommodation chamber connected to the first opening is formed in the convex cover wall and one side of the convex rod, a first shaft hole with a first fixing portion is formed in the convex rod, a second accommodation chamber connected to the second opening, the first shaft hole and the first opening is formed in the convex rod, and a first convex stop is provided at the end of the convex rod; One side sleeve of the position-limiting and deceleration elastic member is arranged on one side of the position-limiting and deceleration sleeve, and the other side is fixed on one side of the rotator, and stretches between the position-limiting and deceleration sleeve and the rotator; The rotator is used to fix the other side of the position-limiting deceleration elastic member. The rotator includes a protrusion and a latch portion opposite to one side of the protrusion, wherein the protrusion has a third opening, and a third chamber connected to the third opening is formed in the protrusion, and a second convex block is provided at the end of the third chamber, and the second convex block is correspondingly locked with the first convex block. The latch portion includes a second axial hole and an internal space separated by an annular protrusion connecting the third chamber and the third opening, a first abutment portion connecting the annular protrusion and the latch portion, and at least one insertion hole formed in the internal space of the latch portion for inserting and positioning the other side of the position-limiting deceleration elastic member, and the second axial hole has a first threaded portion; The limiting swivel is movably threaded with the fixed shaft, and the limiting swivel has a third shaft hole of a second threaded portion and at least one limiting groove. The two sides of the limiting swivel have a second abutment portion and a third abutment portion formed in the limiting groove and opposite to each other, wherein the second abutment portion of the limiting swivel corresponds to the first abutment portion of the rotator; The fixed shaft is used for the limited rotating body and the rotator to rotate and move and is fixed to the inner part of the limited speed reduction sleeve. The fixed shaft includes a shaft rod, a convex ring body, a third threaded portion and a second fixed portion, wherein the convex ring body is provided with a fourth blocking portion on a side surface in the direction of the third threaded portion, and the fourth blocking portion corresponds to the third blocking portion of the limited rotating body, and the third threaded portion engages with the second threaded portion of the limited rotating body and the second threaded portion of the rotator. The first threaded portion, the second fixed portion is connected to the third threaded portion, and the second fixed portion is correspondingly engaged with the first fixed portion; through the fixed shaft, when a roller curtain is rolled up to the upper limit position, the limit rotating body rotates to be locked with the rotator and drives the rotator to rotate and displace, so that the rotator drives the limit deceleration elastic member connected and fixed to the rotator to twist, so that the roller curtain can instantly produce a buffering and deceleration effect when it is rolled up to the upper limit position. A deceleration and position limiting device for a roller blind as described in claim 1, wherein the convex rod has a first rod body connected to one side of the convex cover wall and having an outer diameter smaller than the outer diameter of the convex cover wall, a second rod body connected to one side of the first rod body and having an external thread for threading the position limiting and deceleration elastic member, and a third rod body connected to one side of the second rod body and having an outer diameter smaller than the outer diameter of the second rod body, and the outer periphery of the second rod body gradually tapers from one side to the other side in a conical shape and has an outer diameter larger than the outer diameter of the first rod body. The deceleration limiting device for roller blinds according to claim 2, wherein one side and the other side of the limiting deceleration elastic member form a first penetration space and a second penetration space, and the first penetration space A space is provided for the second rod to penetrate, and the second penetration space is for one side of the rotator to penetrate. The deceleration limiting device for roller blinds as claimed in claim 3, wherein the protruding outer periphery of the rotator is provided with a convex block that forms a distance from the latch portion and limits the limiting deceleration elastic member. A deceleration and limiting device for a roller shutter as described in claim 4, wherein the limiting and deceleration elastic member is a spring. The deceleration limiting device for roller blinds according to claim 1, wherein the first resisting part, the second resisting part, the third resisting part and the fourth resisting part are bumps. The speed reduction and limiting device of the roller shutter as described in claim 1, wherein the first fixing portion is a protrusion; wherein the outer surface of the second fixing portion has a groove corresponding to and engaged with the first fixing portion. As described in claim 1, the speed reduction and limiting device of the roller shutter, wherein the shaft rod has a fourth shaft hole, the fourth shaft hole is a hexagonal hole, and a fixing piece is inserted and fixed into the outer periphery of the shaft rod.

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