TWI588347B - Curtain roll closing reducer - Google Patents

Description

Curtain winding reducer

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a speed reducer, and more particularly to a winder winding reducer that can slow down the winding speed of a curtain.

Referring to Figures 1, 2, and 3, there is the invention patent No. I439601, which discloses a control mechanism 1 installed in an upper rail seat 21 of a curtain 2, which can provide the curtain 2 The resistance of a drive shaft 22 as it rotates to slow the speed of its take-up. The utility model mainly comprises: a casing 11 , an end cover 13 combined with the casing 11 and jointly defining a main chamber 12 , and a sleeve which is coupled with the drive shaft 22 and integrated in the main chamber 12 . 14. A clutch unit 10, the clutch unit 10 including a coupling member 15, a retracting spring 16, and a shaft shifting member 17 that are sheathed around the outer periphery of the sleeve 14.

The end cap 13 has a plurality of first protruding teeth 131 facing the main chamber 12 and surrounding the driving shaft 22, and the sleeve 14 has a plurality of radially protruding ribs 141, the coupling member 15 having a defining a main surrounding wall 152 of the engaging passage 151, and a plurality of second protruding teeth 153 surrounding the engaging passage 151 and engaging with the first protruding teeth 131 of the end cover 13, the engaging passage 151 has A plurality of grooves 154 are provided for the ribs 141 to engage. The axis shifting element 17 There is a cylinder wall 171 which is sheathed around the outer periphery of the coupling member 15, and a guide rail 172 provided on the outer surface of the cylinder wall 171. The cylinder wall 171 has an axial gap 173, and the winding The spring 16 tightens the coupling member 15 and has two legs 161 projecting from the notches 173 of the shaft shifting member 17, and the housing 11 has a guide rail 172 extending into the axis shifting member 17. The protrusion 111.

When the curtain 2 is unfolded and folded, the drive shaft 22 is driven to rotate. Since the drive shaft 22 is coupled with the sleeve 14, the coupling member 15 is axially displaceable and the sleeve 14 is sleeved. The protrusion 111 of the housing 11 projects into the guide rail 172 of the axis shifting element 17. Therefore, when the drive shaft 22 rotates, the sleeve 14, the coupling member 15 and the take-up spring 16 tightened on the coupling member 15 also rotate, when the legs 161 of the take-up spring 16 When one of the sides of the notch 173 of the axis shifting element 17 abuts, it also drives the axis shifting element 17 to rotate.

During the rotation of the shaft shifting member 17, since the projection 111 of the housing 11 projects into the guide rail 172 of the shaft shifting member 17, the shaft shifting member 17 is axially displaced in addition to the rotation. Through the connection of the take-up spring 16, the shaft shifting member 17 also drives the coupling member 15 to move axially, and the second protruding teeth 153 on the coupling member 15 and the second end of the end cover 13 A convex tooth 131 is separated. Since the multi-segment control is generated by the guidance of the axis shifting element 17 through the guiding track 172, this is not a modification of the present invention and will not be described in detail.

Although the foregoing invention patent can achieve the purpose of slowing the rotation speed of the rotating shaft 22 through the clutch unit 10, the retracting spring 16 The elastic force determines the magnitude of the resistance of the control mechanism 1. Therefore, when the curtain 2 requires a large resistance, it is necessary to adopt a retracting spring 16 having a large elastic force, and conversely, if a small resistance is required, it also needs to be replaced. The smaller elastic retracting spring 16, that is, the control mechanism 1 designed by the aforementioned invention patent can slow down the winding speed of the curtain 2, but needs to be manufactured according to each type of curtain 2 of different specifications and weights. Not only can it be modularized during manufacturing, but it is also troublesome to assemble.

SUMMARY OF THE INVENTION The object of the present invention is to provide a winding reducer for a curtain which is suitable for modular production and which can improve assembly convenience.

The winding reducer of the present invention is used for slowing down the winding speed of a reel of a curtain, and comprises: a rotating unit, a fixing unit, a clutch unit, and at least one resistance unit, the rotating unit including a reel a combined main cylinder base having a main chamber and a first abutting portion, and the fixing unit includes a first fixing seat that is engaged with the main cylinder seat, the first fixing seat has a a first latching portion located in the main chamber of the main cylinder base, the clutch unit including an axially displaceable clutch seat mounted in the main chamber of the main cylinder base, the clutch seat having a cause The main cylinder base rotates and the first latch portion of the first fixing seat is latched and the separated second latching portion, the resistance unit includes an extending cylinder seat that abuts the main cylinder base, and the first a fixing bracket coupled to the fixing base, and a resistance spring tightened on the extension deck and imparting rotational resistance to the extension cylinder seat, the extension cylinder seat having a first engagement portion with the main socket Second docking .

The beneficial effect of the invention is that, by utilizing the structural change, the resistance unit is independent of the other components, and in addition to the purpose of slowing down the winding speed, the winding reducer is also suitable for modular production, and thus the curtain is raised. The ease of assembly when changing the resistance to take-up.

3‧‧‧ Curtains

30‧‧‧ Rotation Center

31‧‧‧ reel

32‧‧‧ Curtain

33‧‧‧ Mounting

34‧‧‧Receiving agency

35‧‧‧Retraction reducer

4‧‧‧Rotating unit

41‧‧‧ bushing

42‧‧‧ main tube holder

420‧‧‧First docking

421‧‧‧ main enclosure

422‧‧‧Main bottom

423‧‧‧The main room

424‧‧‧ pin hole

425‧‧‧ first bottom hole

426‧‧‧First card hole

43‧‧‧Latch

5‧‧‧Fixed unit

51‧‧‧First mount

510‧‧ First Card Department

511‧‧‧ Spring Housing

512‧‧‧ Positioning Department

513‧‧‧Restriction Department

514‧‧‧Spring pocket

515‧‧‧ card concave edge

516‧‧‧ card block

518‧‧‧ main fixed rod

519‧‧‧Main slot

52‧‧‧Second mount

521‧‧‧Fixed protrusion

522‧‧‧Fixed hooks

53‧‧‧Top spring

6‧‧‧Clutch unit

61‧‧‧ linkage sets

611‧‧‧ linkage channel

612‧‧‧Group ring wall

613‧‧‧ recess

62‧‧‧Clutch seat

620‧‧‧Second Card Department

621‧‧‧

622‧‧‧ channel

623‧‧‧ inner surface

624‧‧‧ outer surface

625‧‧‧ card slot

626‧‧‧ Guide channel

63‧‧‧Resistance film

7‧‧‧resistance unit

71‧‧‧ Extension base

710‧‧‧Second docking department

711‧‧‧Extension

712‧‧‧extend the bottom

713‧‧‧Extension room

714‧‧‧ third docking department

715‧‧‧Abutment

716‧‧ ‧bump

717‧‧‧ second bottom hole

718‧‧‧ Extended wing

719‧‧‧ docking hook

71A‧‧‧Second card hole

71B‧‧‧ positioning hook

72‧‧‧Extension deck

721‧‧ ‧ spring tightening

722‧‧‧Path

723‧‧‧stop insert

724‧‧‧Extended rod

725‧‧‧Extension slot

726‧‧‧ Kagou

73‧‧‧ resistance spring

731‧‧‧ feet

74‧‧‧Resistance bar

8‧‧‧ Balanced end caps

81‧‧‧End cover wall

82‧‧‧End cover flap

83‧‧‧Fourth Docking Department

831‧‧‧ docking hook

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is an exploded perspective view of the invention patent No. I439601; FIG. 2 is a patent of FIG. Figure 3 is a cross-sectional view of the invention of the invention of Figure 1; Figure 4 is an exploded perspective view of a first embodiment of the retracting reducer of the present invention; Figure 5 is a state of use of the first embodiment 1 is a cross-sectional view showing a state in which the winding reduction gear unit is assembled on a window covering; FIG. 6 is a combined sectional view of the first embodiment, in which the winding speed reducer is positioned at a locking position; FIG. 7 is a view similar to FIG. Figure 2 is a view similar to Figure 6 illustrating a second embodiment of the retracting reducer of the present invention; Figure 9 is a winding reduction of the present invention. Figure 9 is a view similar to Figure 6; 3 is an exploded perspective view of a third embodiment of the present invention; FIG. 10 is a perspective exploded view of a fourth embodiment of the winding reduction gearbox of the present invention Figure 11 is a cross-sectional view of the fourth embodiment illustrating a clutch unit of the winding reducer; and Figure 12 is a view similar to Figure 6 illustrating a fifth embodiment of the winding reducer of the present invention.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to Figures 4 through 7, a first embodiment of the winding reducer 35 of the present invention is mounted on a window covering 3 having a reel 31 rotatable about a center of rotation 30, a retractable And a curtain 32 mounted vertically on the reel 31, a mounting seat 33 mounted on one side in the longitudinal direction of the reel 31, and a other side mounted in the longitudinal direction of the reel 31 and making the reel 31 A take-up mechanism 34 having a take-up function, and the take-up reducer 35 is mounted between the mount 33 and the spool 31. In the design, the structure and form of the retracting mechanism 34 are not particularly limited, that is, the retracting speed reducer 35 of the present invention can be installed on the curtain 3 having the function of pulling and stopping, and can also be installed on the reel. On the curtain 3 of the force, FIG. 5 shows a curtain 3 having a retracting force, but the invention is not limited thereto.

The winding reduction gear unit 35 of the present embodiment comprises: a rotating unit 4 coupled with the reel 31, a fixing unit 5 mounted inside the rotating unit 4 and combined with the mounting seat 33, and a mounting unit 4 mounted thereon. And the clutch unit 6, between the fixed unit 5, and the rotating unit 4 and the resistance unit 7 axially butted by the fixing unit 5, and a balanced end cover 8 axially abutting the resistance unit 7, the balance end cover 8 and the fixing unit 5 are respectively located on opposite sides of the resistance unit 7 .

The rotating unit 4 includes a sleeve 41 that is engaged with the reel 31, a main sleeve 42 that is engaged with the sleeve 41, and a latch that is radially inserted into the main sleeve 42. 43. The main cylinder base 42 has a main surrounding portion 421 surrounding the rotation center 30, a main bottom portion 422 connected to the main surrounding portion 421, and a main chamber defined by the main surrounding portion 421 and the main bottom portion 422. 423, and a first abutting portion 420 at the intersection of the main surrounding portion 421 and the main bottom portion 422, the main surrounding portion 421 has a pin hole 424 through which the pin 43 is inserted, and the main bottom portion 422 has a bit At the first bottom hole 425 on the rotation center 30, the first bottom hole 425 is gradually narrowed outward from the side adjacent to the main chamber 423. The first docking portion 420 has a plurality of first card holes 426 arranged at equal angles.

The fixing unit 5 includes a horizontally disposed first fixing base 51 , a second fixing seat 52 axially engaged with the first fixing base 51 , and a top bracket at the first fixing base 51 and the second fixing The top support spring 53 of the seat 52. The first fixing base 51 has a spring receiving portion 511 which is abutted against the main surrounding portion 421 of the main tubular seat 42 and a first card which is connected to the spring receiving portion 511 and is located in the main chamber 423. a 510, a positioning portion 512 spaced apart from the first latch portion 510, and a limiting portion 513 connected between the first latch portion 510 and the positioning portion 512, the spring receiving portion 511 There is a spring pocket 514 for receiving the top spring 53 and two spaced card recesses 515, and the first latch portion 510 has two pieces A block 516 is provided at intervals. The positioning portion 512 has two main spacers 518 spaced apart and hooked into the first bottom hole 425 of the main cylinder base 42, and a main slot 519 interposed between the main positioning rods 518. The rotation restricting portion 513 is a rod-shaped body having a non-circular cross section.

The second fixing base 52 has a fixing protrusion 521 fixedly engaged with the mounting seat 33, and two spring receiving slots 514 passing through the first fixing base 51 are respectively hooked on the concave edge 515 of the card. The fixing hook 522 is mounted in the spring receiving groove 514 of the first fixing base 51, and the second fixing seat 52 has an axial elastic force to improve the combination of the fixing unit 5 and the mounting seat 33. After the stability.

In this embodiment, the clutch unit 6 includes: a non-rotating but axially movable sleeve 61 that is sleeved at the restricting portion 513 of the first mount 51, and a clutch that fits with the inner sleeve of the linkage sleeve 61. a seat 62, and two resistance pieces 63 mounted on the linkage sleeve 61 and enhancing the frictional resistance between the linkage sleeve 61 and the clutch seat 62. The linkage sleeve 61 has a cross section defining a section to cooperate with the rotation limiting portion 513. The interlocking passage 611 is formed by a ring wall 612 having two recesses 613 recessed from the surface.

The clutch seat 62 has a tubular wall 621 and a second latching portion 620 projecting from the tubular wall 621 toward the first latching portion 510. The tubular wall 621 has an inner surface 623 defining a passage 622. And an outer surface 624, and the second latching portion 620 has a plurality of latching slots 625 that surround the rotating center 30 at equal angles, and the positions of the latching slots 625 and the latching blocks 516 can be reversed. The clutch seat 62 also has a guide channel 626 disposed on the outer surface 624 of the barrel wall 621. And the rotation The latch 43 of the unit 4 is mounted on the main cylinder base 42 and inserted into the guiding channel 626. The cooperation between the latch 43 and the guiding channel 626 can guide the clutch unit 6 at The movement between a snapping position and a non-engaging position, but the use of the guiding channel 626 and the latch 43 to achieve the aforementioned effects, is not a focus of improvement of the present invention, and the structure has been disclosed in the certificate number No. I439601 Since the patent is invented, the detailed structure and the principle of actuation will not be described.

The resistance pieces 63 are respectively mounted in the concave portions 613 of the interlocking sleeve 61 and abut against the inner surface 623 of the clutch seat 62 for the purpose of increasing the frictional resistance between the interlocking sleeve 61 and the clutch seat 62. That is, in this embodiment, the resistance sheets 63 of different thicknesses may be assembled in the concave portions 613 of the interlocking sleeve 61 according to the resistance requirements, and the resistance sheets 63 may be omitted to reduce the frictional resistance.

In the embodiment, the resistance unit 7 includes an extension cylinder seat 71 axially coupled to the main cylinder base 42 of the rotation unit 4, and an extension socket 72 fixedly engaged with the first fixing base 51 of the fixing unit 5, and A resistance spring 73 that causes the extension cylinder base 71 to have rotational resistance. The extension base 71 has an extending portion 711 surrounding the rotation center 30, an extended bottom portion 712 connected to the extension portion 711, and an extension chamber defined by the extension portion 711 and the extension bottom portion 712. 713, a second abutting portion 710 engageable with the first abutting portion 420 of the main cylinder base 42, and a third abutting portion 714 spaced apart from the second abutting portion 710. The extension 711 has a protrusion 716 protruding toward the extension chamber 713 and having two spaced abutment surfaces 715, the extension bottom 712 having a main barrel The first bottom hole 425 of the seat 42 axially corresponds to the second bottom hole 717. The second docking portion 710 has a plurality of docking hooks 719 that can be respectively engaged in the first card holes 426 of the main cartridge base 42. The third docking portion 714 has a plurality of docking cards corresponding to the docking cards. The second card hole 71A of the hook 719. In design, the docking hooks 719 can be aligned with the first card holes 426.

The extension card holder 72 has a spring tightening portion 721 located in the extension chamber 713 and tightened by the resistance spring 73, and is integrally connected with the spring tightening portion 721 and rests on the outside of the protrusion 716. a radial projection 722, a stop insertion portion 723 protruding from the radial projection 722 toward the main slot 519 of the first fixing base 51, two through the second bottom hole 717 and hooked at the extended bottom An extension rod 724 on the 712, and an extension slot 725 between the extension rods 724. The resistance spring 73 has two protruding legs 731.

The balanced end cap 8 has an end cap surrounding wall 81 axially abutting the extending sleeve base 71, and a plurality of end portions of the end cap surrounding wall 81 projecting toward the radially outer end and abutting against the inner surface of the reel 31 a cover wing 82, and a fourth abutting portion 83 protruding from the end cover wall 81 to the third abutting portion 714 of the extending tubular seat 71, the fourth butting portion 83 having a plurality of engageable in the third The docking hooks 831 in the second card holes 71A of the abutting portion 714.

When the winding reduction gear 35 is in the engagement position shown in FIG. 6 , the second latching portion 620 of the clutch seat 62 is engaged with the first latching portion 510 of the first fixing base 51 . At this time, the reel 31 can be maintained in a stop state.

When the curtain 32 is pulled to drive the reel 31 to rotate, In addition to the retracting mechanism 34 accumulating the retracting force, the reel 31 also drives the rotating unit 4 to rotate. Since the latch 43 of the rotating unit 4 is inserted into the guiding channel 626 of the clutch seat 62, When the latch 43 rotates around the rotation center 30, the second latch portion 620 that pushes the clutch seat 62 is gradually separated from the first latch portion 510 of the first mount 51, and is switched to FIG. 7. Non-engaged position. That is, when the clutch seat 62 is rotated, the frictional resistance of the resistance pieces 63 can be used to interlock the axial movement of the interlocking sleeve 61 that is engaged with the first fixing base 51.

During the rotation of the rotating unit 4, the first butt joint 420 and the second butt joint 710 are butt-fixed between the main cylinder base 42 and the extension cylinder base 71, and the extension cylinder base 71 and the The third end portion 714 and the fourth butting portion 83 are also abutted and fixed between the balance end caps 8. Therefore, the main tube holder 42, the extension tube holder 71 and the balance end cover 8 which are connected in series are synchronously linked.

One of the abutting faces 715 of the protrusion 716 of the extending barrel base 71 will abut against one of the legs 731 of the resistance spring 73 due to the rotation, and The foot 731 is pushed to move, that is, the resistance spring 73 is pushed to relax, the force of the pushing creates resistance, and the curtain 3 is made to have a resistance when it is lowered to prevent it from falling too fast. By the same token, when the reel 31 is rotated in a reeling direction, the extension base 71 of the resistance unit 7 also abuts against the other leg of the leg 731 of the resistance spring 73, since the curtain 3 is When retracting, the retracting mechanism 34 releases the retracting force and causes a quick retraction, and the winding reduction gear 35 of the present invention can provide the winding resistance, so the winding reduction gear 35 of the embodiment It does have the effect of slowing down.

Referring to Figure 8, the structure of a second embodiment of the retracting reducer of the present invention is similar to that of the first embodiment, except that the retractor 35 includes two axially connected resistance units 7 by means of By changing the number of the resistance units 7, the winding resistance can be changed according to the needs of use. Since the series connection of the resistance units 7 is quite convenient, the invention has the effect of slowing down, is also suitable for modular production, and improves the curtains. Convenience when changing resistance.

Referring to Figure 9, the third embodiment of the retracting reducer of the present invention has a structure similar to that of the first embodiment, that is, the reduction reducer 35 includes a rotating unit 4, a fixed unit 5, a clutch unit 6, and a a resistance unit 7, the resistance unit 7 also includes an extension cylinder base 71, an extension deck 72, and a resistance spring 73. The difference between this embodiment and the first embodiment is that the extension cylinder base 71 further has a plurality of pieces. The extension 711 extends toward the radially outer end of the extension tab 718. The aforementioned extension flap 718 can replace the balance end cap 8 of the first embodiment to assist the retractor 35 to be securely mounted on the reel 31 (see Fig. 5).

Referring to Figures 10 and 11, the structure of a fourth embodiment of the retracting reducer of the present invention is similar to that of the first embodiment, except that the spring tightening portion 721 of the extension bracket 72 of the resistance unit 7 has a number The resistance unit 7 further includes a plurality of resistance bars 74 respectively mounted in the card grooves 726. The number of the resistance bars 74 can be increased or decreased according to the use, and the purpose is to change the resistance spring 73 and The tightening force between the extension decks 72.

Referring to Figure 12, a fifth embodiment of the retracting reducer of the present invention The structure is similar to that of the first embodiment, except that the structure of the main positioning rod 518 and the extension rods 724 are changed to form a sheet-like structure, and the main bottom 422 or the extended bottom portion The extension pedestal 71 further has two positioning hooks 71B protruding from the extension 711 to the extension chamber 713 for assisting in fixing the extension card holder 72.

It can be seen from the above description that the present invention separates the clutch structure from the structure that generates the resistance, and makes the axially buttable design not only structurally innovative, but also suitable for production in a modular manner, and at the same time, when the resistance is adjusted, the The number of the resistance units 7 can be connected in series, so the winding reduction gear unit 35 of the present invention has the advantages of being suitable for modular production and improving assembly convenience.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

4‧‧‧Rotating unit

41‧‧‧ bushing

42‧‧‧ main tube holder

420‧‧‧First docking

421‧‧‧ main enclosure

423‧‧‧The main room

424‧‧‧ pin hole

426‧‧‧First card hole

43‧‧‧Latch

5‧‧‧Fixed unit

51‧‧‧First mount

510‧‧ First Card Department

511‧‧‧ Spring Housing

512‧‧‧ Positioning Department

513‧‧‧Restriction Department

514‧‧‧Spring pocket

515‧‧‧ card concave edge

516‧‧‧ card block

518‧‧‧ main fixed rod

52‧‧‧Second mount

521‧‧‧Fixed protrusion

522‧‧‧Fixed hooks

53‧‧‧Top spring

6‧‧‧Clutch unit

61‧‧‧ linkage sets

611‧‧‧ linkage channel

612‧‧‧Group ring wall

613‧‧‧ recess

62‧‧‧Clutch seat

620‧‧‧Second Card Department

621‧‧‧

622‧‧‧ channel

623‧‧‧ inner surface

624‧‧‧ outer surface

625‧‧‧ card slot

626‧‧‧ Guide channel

63‧‧‧Resistance film

7‧‧‧resistance unit

71‧‧‧ Extension base

710‧‧‧Second docking department

711‧‧‧Extension

714‧‧‧ third docking department

715‧‧‧Abutment

716‧‧ ‧bump

719‧‧‧ docking hook

71A‧‧‧Second card hole

72‧‧‧Extension deck

721‧‧ ‧ spring tightening

722‧‧‧Path

723‧‧‧stop insert

724‧‧‧Extended rod

73‧‧‧ resistance spring

731‧‧‧ feet

8‧‧‧ Balanced end caps

81‧‧‧End cover wall

82‧‧‧End cover flap

83‧‧‧Fourth Docking Department

831‧‧‧ docking hook

Claims (9)

A curtain winding reducer for slowing down the winding speed of a reel of a curtain, and comprising: a rotating unit comprising a main cylinder base coupled with the reel, the main cylinder housing having a main chamber And a first docking portion; a fixing unit comprising a first fixing seat that is engaged with the main cylinder seat, the first fixing seat has a first latching portion located in the main chamber of the main cylinder base; a clutch unit includes an axially displaceable clutch seat mounted in the main chamber of the main cylinder base, the clutch seat having a first latch that is rotatable by the main cylinder seat and the first mount a second latching portion and a separated second latching portion; and at least one resistance unit comprising an extension cartridge seat that abuts the main cartridge holder, an extension card holder coupled to the first holder, and a bundled body And a resistance spring extending on the card holder and imparting a rotation resistance of the extension cylinder seat, the extension cylinder base having a second abutting portion of the main socket of the main cylinder seat. The winder winding reducer of claim 1, wherein the first fixing base has a limiting portion located in the main chamber of the main cylinder base, and the clutch unit further comprises a clutch seat The resistance sleeve is sleeved, and the linkage sleeve is non-rotatingly sleeved on the limiting portion of the first fixing seat. The winding reduction gear of the curtain according to claim 2, wherein the clutch unit further comprises at least one adjustable between the linkage sleeve and the clutch seat A resistance piece that rubs resistance. The winder retractor of claim 1, wherein the resistance unit further comprises at least one resistance bar mounted on the extension deck and capable of increasing the resistance of the resistance spring. The winder winding reducer of claim 1, wherein the main cylinder base further has a main circumference portion, and a main bottom portion defining the main chamber together with the main circumference portion, and the first docking portion The portion is located at the intersection of the main portion and the main bottom portion, and has a plurality of first card holes arranged at intervals, and the extension tube base of the resistance unit further has an extending portion and an extension connected to the extending portion a bottom portion, and the second abutting portion is coupled to the extending portion and away from the extending bottom portion, and has a plurality of mating hooks that are respectively engageable in the first card holes of the main tube holder. The reel of the curtain according to claim 5, wherein the rotating unit further comprises a sleeve sleeved between the main cylinder base and the reel, and the extension cylinder base of the resistance unit further has a The second docking portion is on the opposite side of the third abutting portion; the winding speed reducer further comprises a balanced end cover axially engaged with the resistance unit, the balanced end cover comprises an end cover surrounding wall, and the plurality of An end cover flange protruding from the end wall of the end cover toward the reel, and a fourth abutting portion engaged with the third abutting portion of the resistance unit. The winding retractor of the curtain according to claim 5, wherein the rotating unit further comprises a sleeve sleeved between the main cylinder base and the reel, and the extension cylinder base of the resistance unit further has an extension a circumference, and a plurality of extensions protruding from the extension to the reel wing. The winder winding reducer of any one of claim 1 to claim 5, comprising a plurality of axially connected resistance units, the extension base of each resistance unit further having one and the second The abutting portions are respectively located at the third abutting portions on the opposite sides. The winder winding reducer of claim 1, wherein the first fixing base further has a spring receiving portion connected to the first latching portion and a positioning in a main chamber of the main cartridge base. And a limiting portion connected between the positioning portion and the spring receiving portion, the spring receiving portion has a spring receiving groove, and the fixing unit further includes a second engaging with the first fixing seat a fixing seat, and a top stay spring mounted in the spring pocket and having the second fixing seat elastic.