WO2015018234A1 - Top-open roller blind - Google Patents

Abstract

A top-open roller blind comprising a blind cloth (2) and a scroll (1); two ends of the scroll (1) are connected with a movable pulley mechanism; the movable pulley mechanism comprises movable pulleys (3) and a traction rope (5) that works in conjunction with the movable pulleys (3); a clutch mechanism is provided between the scroll (1) and the movable pulleys (3); the traction rope (5) drives the movable pulleys (3) and the scroll (1) to move up and down together, and drives the movable pulleys (3) to self-rotate. The top-open roller blind can be opened from the top of the window and can maintain the blind cloth (2) at any position.

Description

 Open roller blind

 Technical field

 The invention belongs to a kind of curtain, and particularly belongs to a roller blind.

 Background technique

Roller blinds are easy to use and elegant, and are widely used in home life and office space. The conventional method of the conventional roller blinds is to fix the reel to the upper end of the window, rotate the reel, wind up or release the cord. The curtains are first opened from the lower part of the window, so that the upper part of the window is shaded, and the lower part is lit. When the window is opened, the lower part of the window cannot block the line of sight, which is called a lower opening type roller blind.

In real life, private spaces such as rooms, reception rooms, and toilets, school classrooms, and some office spaces often require the lower half of the window to block the line of sight and use the upper part to illuminate. This requires an open curtain blind.

 The need for open-top roller blinds has been of concern to many inventors. China Patent Licensing Bulletin No. CN258081Y A roller blind according to a variety of shielding methods is disclosed. The patent pre-adjusts the release length of the cord through a suspended lower roller blind shaft, and then lifts the adjusted cord and the lower roller blind shaft through the traction rope on the upper roller blind shaft, thereby adjusting the position of the curtain covering, and can be arbitrarily blocked in the window Upper, lower or all. In the above structure, the length and the shading position of the curtain need to be changed by two independent operations. The release length of the adjustment curtain and the lifting curtain cannot be simultaneously performed, and the upper opening effect of gradually opening the curtain from the upper portion to block the window is not realized. And the operation process is cumbersome.

 Summary of the invention

The present invention provides a top-opening roller blind to solve the problem that the existing roller blind can not be gradually opened from the upper portion of the window, and the curtain can be arbitrarily adjusted to block the upper, lower or all of the window.

 The object of the invention is achieved in this way:

An upper open type roller blind comprises a reel, a cord and a lifting control mechanism, wherein the reel has a movable pulley mechanism connected at both ends thereof, the movable pulley mechanism comprises a movable pulley and a traction rope matched with the movable pulley, the traction rope is fixed at one end, and the traction rope is fixed at one end One end is the free end of the connection drive mechanism. The traction rope moves the pulley together with the reel and simultaneously drives the movable pulley to rotate.

The upper open type roller blind is first adjusted to adjust the position of the traction rope and the movable pulley when the reel connected to the movable pulley is at the highest point, and the lower end of the curtain is located at the lower edge of the window to completely block the window; When the cord is opened, the traction rope is released by the driving mechanism, and the movable pulley and the reel move downward by gravity, and the movable pulley rotates under the driving of the traction rope to drive the reel to rotate, and the curtain is wound on the reel, thereby The occlusion of the window by the upper open roller blind is opened from the upper portion. By designing the radius or attachment mechanism of the moving pulley and the reel, the speed at which the reel is lowered and the speed at which the curtain is wound on the reel are similar, so that the lower end of the roller blind can be kept substantially stationary near the lower edge of the window.

When the curtain is closed, the driving mechanism pulls back the traction rope. The moving pulley drives the reel to move upwards under the driving of the traction rope, and simultaneously drives the reel to rotate in the opposite direction to release the curtain. The lighting portion above the reel is reduced, and the curtain below the reel remains sagging. Shading, the gradual closing of the curtain from the bottom to the top is achieved. Since the speed at which the reel rises is similar to the speed at which the curtain is released from the reel, the lower end of the roller blind remains substantially stationary near the lower edge of the window.

In order to make the traction ropes of the movable pulley mechanism disposed at both ends of the reel consistent in the direction of force, it is preferable to include a fixed pulley, the free end of the traction rope is connected to the winder around the fixed pulley, and the winder is driven by the power mechanism to rotate . The traction ropes of the movable pulley mechanism at both ends of the reel are connected to the same driving mechanism through the fixed pulleys, so that the driving mechanism can synchronously control the movable pulleys at both ends of the reel to rise and fall at the same speed to keep the curtain winding smoothly. The power mechanism for driving the winder to rotate is a manual runner or a motor.

Preferably, the drive mechanism is composed of an upper reel disposed above the reel and a power mechanism that drives the rotation thereof. The upper reel is fixed above the window, and one end of the traction rope of the movable pulley mechanism at both ends of the reel is respectively fixed on two sides of the upper side of the window, and the free ends are respectively connected to corresponding positions on the upper reel, and the upper reel is rotated, and the traction rope is on the upper reel. The corresponding position is taken up or released. The power mechanism for driving the upper reel to rotate is a manual runner or a motor.

 Preferably, one or both ends of the reel and the movable pulley Coaxial fixed connection. This is the most basic structure of the present invention. The movable pulley and the reel have a simple coaxial fixed connection structure, and the lifting and rotating of the movable pulley are directly transmitted to the reel synchronously, and the traction rope can be pulled. The occlusion of the curtain from the window is opened from the upper portion or gradually closed from the bottom to the top. The connection between the reel and the movable pulley can be coaxially fixedly connected at one end, and the other end is coaxially movably connected. When the vertical lifting is performed, the movable pulley driving the reel at one end of the coaxial fixed connection rotates, and the other end only drives the reel to vertically rise and fall.

In order to keep the position of the lower end of the curtain substantially unchanged when the curtain is opened and closed, and always keep the lower half of the window obscured, it is necessary to keep the lifting speed of the reel consistent with the retracting speed of the curtain. Tests have shown that when the radius of the moving pulley is substantially equal to the radius of the reel, the lifting speed of the reel and the retracting speed of the reel are also substantially equal. Preferably, the radius of the movable pulley is the radius of the reel 0.7-1.3 times.

In order to increase the selection range of the radius of the reel, preferably, the movable pulley and the reel are connected by a transmission mechanism. The speed of the moving pulley is transmitted to the reel through the transmission mechanism. For different required reel radii, the lifting speed of the reel can be adjusted to ensure that the lifting speed of the reel and the retracting speed of the reel are substantially the same, so that the position of the lower end of the curtain remains substantially unchanged.

In order to achieve a controllable transmission of the rotational speed between the movable pulley and the reel, preferably, a clutch mechanism is provided between the movable pulley and the reel. The clutch mechanism controls the connection and disconnection of the rotational speed transmission between the movable pulley and the reel, and at the same time, when the rotational speed is transmitted between the disconnecting pulley and the reel, the locking reel rotates due to the gravity of the curtain. When the clutch mechanism is connected, the reel winds up the curtain while lifting, keeping the lower half of the curtain obscured; when the clutch mechanism is disconnected, the reel is locked by rotation, which does not cause the curtain to be released, and only the follower pulley is lifted and lowered together. The above arrangement enables the invention to not only realize the open opening of the curtain, but also realize that after the curtain portion is opened, the same driving mechanism is used to move the curtain up and down to block any part of the window.

 The transmission mechanism and the clutch mechanism provided between the movable pulley and the reel have various structures.

Preferably, the end of the reel is provided with an adjusting groove extending from the axial center and extending in the radial direction, the rotating shaft of the movable pulley passes through the adjusting groove, and a portion extending into the reel is provided with a retaining piece, and the reel end The portion is provided with a pin hole, and the movable pulley is provided with a positioning hole corresponding to the pin hole on the reel, and the pin in the pin hole can extend through the end face of the reel into the positioning hole on the movable pulley. In order to keep the pin stably inserted into the positioning hole on the movable pulley, a spring is arranged between the bottom surface of the bolt hole and the bolt. When the moving pulley rotating shaft is located at the starting end of the adjusting groove, the pin is inserted into the positioning hole, the rotational speed transmission between the moving pulley and the reel is connected, and the movable pulley drives the reel to rotate coaxially; when the moving pulley rotating shaft is located at the extending end of the adjusting groove, the pin exits the positioning hole The transmission of the rotational speed between the movable pulley and the reel is disconnected. At the same time, since the axle of the movable pulley is at the eccentric position of the reel, the reel cannot rotate under the action of gravity, and the reel cannot be released, and only the follower pulley is lifted and lowered together.

Preferably, the transmission mechanism comprises a carrier and a gear set mounted in the carrier, the gear set comprises a driving gear fixed coaxially with the movable pulley, a driven gear coaxially fixedly connected with the reel, and a transmission kinetic energy of the driving gear An intermediate gear to the driven gear; the gear carrier is provided with an arc adjusting hole matched with the axle of the intermediate gear, and a first ratchet is fixed in the carrier, and the axle of the intermediate gear is located in the curved adjusting hole At the end, the intermediate gear meshes with the driving gear and the first ratchet, respectively. When the intermediate gear meshes with the driving gear, the rotational speed transmission between the movable pulley and the reel is connected, and the movable pulley drives the reel to rotate through the gear set to realize the upper opening or closing of the curtain; when the intermediate gear meshes with the first ratchet, the movable pulley and the reel The inter-speed transmission is disconnected, and since the driven gear is connected to the intermediate gear and the first ratchet, the reel cannot rotate, and does not cause the curtain to be released, and only the follower pulley is lifted and lowered together.

Preferably, the transmission mechanism includes a carrier and a gear set mounted in the carrier, the gear set includes a driving gear coaxially fixedly coupled to the movable pulley and a driven gear coaxially slidably coupled to the reel; A second ratchet that locks the driven gear is fixed to the lower portion. When the driven gear slides into the meshing position with the driving gear, the driving gear drives the driven gear and the reel to rotate; when the driven gear slides to the position with the second ratchet, the driving gear is disengaged from the driven gear while the second ratchet is locked from The rotation of the moving gear and the reel.

 The beneficial effects of the invention:

 The upper open type roller blind of the present invention is provided with a movable pulley mechanism at both ends of the reel, so that the reel is lowered while the cord is rolled up, and the cord is released while being lifted. The problem that the existing roller blind can not gradually open the curtain from the upper part of the window is solved. By designing the connecting mechanism of the movable pulley and the reel, it is also possible to use the same driving mechanism to arbitrarily adjust the position of the curtain to block the window, which is simple and convenient to use. .

 DRAWINGS

 Figure 1 is a schematic view showing the structure of one end of a reel according to the present invention.

 Fig. 2 is a schematic view showing the structure of the curtain in the present invention when the curtain is completely shielded from the window.

 Fig. 3 is a schematic view showing the structure of the cord in the present invention when it is opened from the upper portion.

 Fig. 4 is a schematic view showing the structure of the embodiment 3 when the curtain is opened from the upper portion.

 Fig. 5 is a structural schematic view showing the connection of the rotational speed between the movable pulley and the reel in the embodiment 4.

 Fig. 6 is a structural schematic view showing the transmission of the rotational speed between the moving pulley and the reel in the embodiment 4.

 Fig. 7 is a structural schematic view showing the transmission of the rotational speed between the movable pulley and the reel in the embodiment 5.

 Figure 8 is a schematic view of the structure corresponding to the gear set of Figure 7.

 Fig. 9 is a structural schematic view showing the transmission of the rotational speed between the movable pulley and the reel in the embodiment 5.

 Figure 10 is a schematic view showing the structure of the gear set corresponding to Figure 9.

 Fig. 11 is a structural schematic view showing the connection of the rotational speed between the moving pulley and the reel in Embodiment 6.

 Fig. 12 is a structural schematic view showing the state in which the transmission of the rotational speed between the moving pulley and the reel is interrupted in the embodiment 6.

 Figure 13 is a schematic view showing the structure in which the reel and the movable pulley are locked while the reel and the movable pulley housing are unlocked in Embodiment 7.

 Fig. 14 is a side view showing the structure when the reel and the movable pulley are locked in the embodiment 7.

 Fig. 15 is a structural schematic view showing the reel and the movable pulley unlocked in the embodiment 7 and the reel and the movable pulley housing are locked.

 detailed description

 Example 1

 As shown in FIG. 1, FIG. 2 and FIG. 3, the embodiment includes a curtain 2 and a reel 1 which is connected to the reel 1 Upper, reel 1 is connected with a movable pulley mechanism at both ends, and the movable pulley mechanism comprises a movable pulley 3 and a traction rope 5 matched with the movable pulley 3, the traction rope 5 is fixed at one end, and the other end is a fixed pulley 4 Free end connected to the drive mechanism. In this embodiment, a window 9 is provided.

 Wherein, the driving mechanism is composed of a winder 6 and a power mechanism that drives the rotation thereof, and the power mechanism includes a gear disposed coaxially with the winder 6 And a bead chain 7 that cooperates with the gear 8 , and the free end of the leash 5 is connected to the winder 6 . When pulling the bead chain 7, the traction rope 5 carries the moving pulley 3 and the reel 1 Lifting together, while driving the movable pulley 3 to rotate.

 In the present embodiment, Fig. 1 shows one end of the reel 1, and the movable pulley 3 is coaxially fixedly connected to the reel 1. Scroll 1 At the other end, the movable pulley and the reel 1 are coaxially fixedly connected or coaxially connected. When the other end of the reel 1 is movably connected coaxially with the movable pulley, the movable pulley 3 at one end of the coaxial fixed connection is vertically driven up and down to drive the reel 1 Rotation, while the other end of the coaxial movable connection only drives the reel to rise and fall vertically, and the movable pulley and the reel can rotate freely. This arrangement prevents the reel from twisting when the rotation of the two ends is inconsistent.

 In order to keep the position of the lower end of the curtain 2 substantially unchanged during the opening and closing of the embodiment, the moving speed and the curtain 2 of the pulling rope 5 are maintained. The speed of the roll and the movement are the same. For this reason, the radius of the movable pulley 3 is set to be the same as the radius of the reel 1, and the elevating speed of the reel 1 is the same as the winding linear velocity of the reel 1, thereby realizing the cord 2 During the winding and opening process, the position of the lower end of the curtain 2 remains substantially unchanged.

 As shown in Figure 2, when the reel 1 is at the highest point, the curtain 2 is fully unfolded, completely obscuring the window 9; the curtain needs to be opened 2 When pulling the bead chain 7 to drive the winder 6 to rotate and release the traction rope 5, the reel 1 and the movable pulley 3 move downward by gravity, and while moving downward, the traction rope 5 drives the movable pulley 3 Rotating, thereby driving the reel 1 to rotate, winding the ply 2 over the reel 1 to open the ply 2 from top to bottom. Since the curtain 2 is wound up on the reel at a moderate speed during the lowering process 1 Above, the position of the lower end of the curtain is kept substantially unchanged.

 As shown in Figure 3, pulling the bead chain 7 in the opposite direction drives the winder 6 to rotate in the opposite direction, pulling back the traction rope 5, and moving the pulley 3 on the traction rope 5 Driven by the reel 1 to move upwards, while the movable pulley 3 drives the reel 1 to rotate in the opposite direction by reverse rotation, thereby releasing the curtain 2, and the lighting portion above the reel 1 is reduced, and the reel 1 The following curtains are kept sag shading, and the gradual closing of the curtain from the bottom to the top is achieved. Since the cord 2 is released from the reel 1 at a moderate speed during the ascent, the position of the lower end of the cord remains substantially unchanged.

 Example 2

 Compared with the first embodiment, the present embodiment is different from the embodiment 1 except that the structures of the traction rope 5 and the movable pulley 3 are different. the same.

 In this embodiment, the traction rope adopts a bead chain, and the movable pulley adopts The gear meshing with the bead chain can avoid the sliding between the traction rope and the movable pulley, so that the opening and closing of the curtain is more accurate.

 Example 3

 This embodiment is the same as the first embodiment except that the structure of the drive mechanism is different from that of the first embodiment.

 As shown in FIG. 4, in the present embodiment, the drive mechanism is provided by an upper reel 10 disposed above the reel. And a dynamic mechanism that drives its rotation. The upper reel 10 is fixedly mounted above the window, and the fixed ends of the traction ropes 5 of the movable pulley mechanism at both ends of the reel 1 are fixedly mounted on the upper sides of the window respectively, and the traction rope 5 The free ends are respectively connected to the corresponding positions on the upper reel 10, and the upper reel 10 is rotated, and the traction rope 5 The corresponding position on the upper reel is taken up or released. The power mechanism for driving the upper reel to rotate is a manual runner or a motor.

 Example 4

 Compared with the first embodiment, the present embodiment is different from the embodiment 1 except that the movable pulley 3 is connected to the reel 1 in a different manner. the same.

 As shown in Fig. 5 and Fig. 6, the end of the reel 1 is provided with an adjustment groove 11 starting from the axis and extending in the radial direction, and the movable pulley 3 The rotating shaft passes through the adjusting groove 11, and a portion extending into the reel 1 is provided with a retaining member 12, and the end of the reel 1 is provided with a pin hole 14 corresponding to the pin hole 14 on the reel 1 The position of the pin 15 is provided, and the pin 15 in the pin hole can extend through the positioning hole of the movable pulley 3 through the end surface of the reel 1, and a spring 16 is arranged between the bottom surface of the pin hole 14 and the pin 15. Figure 5 When the moving pulley shaft is at the beginning of the adjustment slot 11, the pin 15 is inserted into the positioning hole 13, and the spring 16 pushes the pin 15 to stabilize the latch 15 and the movable pulley 3 and the reel 1 The speed transmission between the movable pulley 3 and the reel 1 is connected, and the movable pulley 3 drives the reel 1 to rotate coaxially; FIG. 6 shows the movable pulley 3 when the rotating shaft is located at the extended end of the adjusting groove 11, the pin 15 Exiting the positioning hole 13, the speed transmission between the movable pulley 3 and the reel 1 is disconnected, and at the same time, due to the eccentric position of the reel of the moving pulley, under the action of gravity, the reel 1 Can not rotate, will not lead to the release of the curtain, only the follower pulley to lift and lower. Therefore, after the curtain portion is opened, the same driving mechanism is used to move the curtain up and down to block any part of the window.

 Example 5

 Compared with the first embodiment, the present embodiment is different from the embodiment 1 except that the movable pulley 3 is connected to the reel 1 in a different manner. the same.

 As shown in Figure 7, Figure 8, Figure 9, and Figure 10, the movable pulley 3 and the reel 1 There is a transmission mechanism including a carrier 21 and a gear set mounted in the carrier 21, the gear set including a driving gear 22 coaxially fixedly coupled to the movable pulley 3, and a reel 1 The driven gear 23 coaxially fixedly coupled and the intermediate gear 24 transmitting the driving gear 22 to the driven gear 23; the carrier 21 is provided with an arc adjusting hole that cooperates with the axle of the intermediate gear 24 26, one end of the axle of the intermediate gear 24 is provided with an adjustment knob 27, and a first ratchet 25 matched with the driven gear 23 is fixed in the carrier.

 Figure 7 and Figure 8 show the intermediate gear 24 connected to the drive gear 22 and the driven gear 23, the movable pulley 3 and the reel 1 The speed transmission is connected, and the movable pulley 3 drives the reel 1 to rotate while vertically lifting, and the curtain is opened or closed.

 Figure 9 and Figure 10 show that the intermediate gear 24 is connected to the driven gear 23 while meshing with the first ratchet 25, the movable pulley 3 The speed transmission between the reel 1 and the reel 1 is broken, and the movable pulley 3 cannot drive the reel 1 to rotate, but the reel 1 can be driven up and down vertically. Since the driven gear 23 is connected to the intermediate gear 24 and the first ratchet 25, the reel 1 is locked and cannot rotate, it will not cause the curtain to be released by gravity, only the follower pulley 3 will be lifted and lowered together. This allows the curtain to be moved up and down to block any part of the window.

 Example 6

 Compared with the first embodiment, the present embodiment is different from the embodiment 1 except that the movable pulley 3 is connected to the reel 1 in a different manner. the same.

 As shown in Fig. 11 and Fig. 12, a transmission mechanism is provided between the movable pulley 3 and the reel 1, and the transmission mechanism includes a carrier 21 And a gear set that is mounted in the carrier 21, the gear set includes a driving gear 22 coaxially fixedly coupled to the movable pulley 3, and a driven gear 23 coaxially slidably coupled to the spool 1 is fixed to the carrier 21 A second ratchet 28 that cooperates with the driven gear 23. As shown in Fig. 11, the driven gear 23 slides to the position engaged with the driving gear 22, the movable pulley 3 and the reel 1 The speed transmission is connected, and the movable pulley 3 drives the reel 1 to rotate and rotate at the same time, and the curtain is opened or closed. As shown in Fig. 12, the driven gear 23 slides to a position where it engages with the second ratchet 28, and is disengaged. When the driving gear 22, the transmission speed between the movable pulley 3 and the reel 1 is disconnected, the reel 1 is locked and cannot rotate, and the curtain is not released by gravity, only the follower pulley 3 Lift together. This allows the curtain to be moved up and down to block any part of the window.

 Example 7

 Compared with the first embodiment, the present embodiment is different from the embodiment 1 except that the movable pulley 3 is connected to the reel 1 in a different manner. the same.

 As shown in Fig. 13, the reel 1 is fixedly connected with a tubular extension shaft 31 on which the movable pulley housing 32 and the movable pulley are sequentially mounted. 3, the movable pulley shell 32 and the movable pulley 3 are respectively provided with locking holes 33 and 35. In the unlocked state, the movable pulley housing 32 and the movable pulley 3 can be on the extension shaft 31. Free to rotate above. A slidable locking bolt 36 is mounted in the tube of the extension shaft 31. In the state shown in Fig. 13, the lock pin 36 slides to the left, and the right end thereof is inserted into the lock hole 35 on the movable pulley 3 , the movable pulley 3 and the reel 1 are locked, and the left end thereof is retracted from the locking hole 33 on the movable pulley housing 32, and the locking of the movable pulley 3 and the reel 1 is released, and the traction rope drives the reel 1 The lift moves at the same time.

 Figure 14 is a side elevational view of the embodiment. Traction rope 5 bypass pulley 3, driven pulley housing 32 Pass through the opening and slide inside.

In the state shown in Fig. 15, the locking bolt 36 slides to the right, and the left end thereof is inserted into the locking hole 33 on the movable pulley housing 32 to lock the movable pulley housing 32 and the spool 1, while the right end thereof is released from the locking hole 35 on the movable pulley 3, and is released. The movable pulley 3 and the reel 1 are locked, and the traction rope is rotated by the movable pulley 3, so that the reel 1 only moves up and down but does not rotate. Since the traction rope 5 passes through the opening of the driven pulley housing 32, and the movable pulley housing 32 and the spool 1 are locked, the reverse rotation of the spool 1 due to the gravity of the curtain is avoided, and the cord is prevented from freely descending.

Claims (10)

1. An open-type roller blind, comprising a reel, a cord and a lifting control mechanism, wherein a movable pulley mechanism is connected to both ends of the reel, and the movable pulley mechanism comprises a movable pulley and a traction rope matched with the movable pulley, the traction rope One end is fixed, and the other end is a free end connected to the driving mechanism, and the traction rope is driven to move up and down together with the reel while driving the movable pulley to rotate.
2. The above-described roller blind according to claim 1, comprising a fixed pulley, wherein the free end of the traction rope is connected to the winder around the fixed pulley, The winder is driven to rotate by a power mechanism.
3. The above-described roller blind according to claim 1, wherein The drive mechanism consists of an upper reel disposed above the reel and a power mechanism that drives its rotation.
4. The above-mentioned open-type roller blind according to claim 1, wherein one or both ends of the reel are coaxially fixedly coupled to the movable pulley.
5. The above-described roller blind according to claim 4, wherein the radius of the movable pulley is 0.7-1.3 of the radius of the reel. Times.
6. The above-described roller blind according to claim 1, wherein one or both ends of the reel are connected to the movable pulley through a transmission mechanism.
7. The above-described roller blind according to claim 6, wherein a clutch mechanism is provided between the movable pulley and the spool.
8. Claim 7 The upper open type roller blind is characterized in that: the end portion of the reel is provided with an adjusting groove extending from the axial center and extending in the radial direction, and the rotating shaft of the movable pulley passes through the adjusting groove and is disposed in a portion of the reel There is a retaining member, the end of the reel is provided with a pin hole, and the movable pulley is provided with a positioning hole corresponding to the pin hole on the reel, and the pin in the pin hole can extend through the end face of the reel into the positioning hole on the movable pulley. A spring is disposed between the bottom surface of the bolt hole and the bolt.
9. Claim 7 The upper open type roller blind is characterized in that the transmission mechanism comprises a carrier and a gear set mounted in the carrier, the gear set comprises a driving gear coaxially fixedly connected with the movable pulley, and is coaxially fixedly connected with the reel a driven gear and an intermediate gear that transmits the kinetic energy of the driving gear to the driven gear; the gear carrier is provided with an arc adjusting hole that cooperates with the axle of the intermediate gear, and a first ratchet is fixed in the carrier, the middle When the axle of the gear is located at both ends of the arc adjusting hole, the intermediate gear meshes with the driving gear and the first ratchet, respectively.
10. Claim 7 The upper open type roller blind is characterized in that the transmission mechanism comprises a carrier and a gear set mounted in the carrier, the gear set comprises a driving gear coaxially fixedly connected with the movable pulley and a coaxial sliding connection with the reel a driven gear; a second ratchet that locks the driven gear is fixed to a lower portion of the carrier.