Day and night curtain double-track double-control associated type limiter

Abstract

The application discloses a day and night curtain double-track double-control associated type stopper, which comprises a stop seat, a downward stop block, an upward stop block, a main screw rod, a main gear, an auxiliary screw rod and an auxiliary gear, the main gear is engaged with the auxiliary gear, the downward stop protrusion is arranged on the main screw rod, the upward stop protrusion and a synchronous linkage protrusion are arranged on the auxiliary screw rod, the end face of the auxiliary gear is provided with a synchronous linkage shift block, the synchronous linkage shift block drives the synchronous linkage protrusion, and the auxiliary core shaft rotates synchronously with the main core shaft. The stopper adopts the technical scheme, realizes the double-track double-control associated type stop control, and when the curtain body bottom rail is moved upward to support the curtain body top rail, the lifting rope of the curtain body top rail lifting winding device loses the gravity of the curtain body top rail, the double tracks are synchronously linked through the stopper, the problems of the loosening of the lifting rope of the curtain body top rail lifting winding device and the disorder of the lifting rope are solved, and the operation of the day and night curtain is safer and more reliable.

Description

Technical Field

[0001] This invention relates to the field of curtain technology, specifically to a limiter for day and night curtains. Background Technology

[0002] Existing pleated blinds, Venetian blinds, and day-night blinds all have stacked curtains, which are the parts of the curtains used for raising, lowering, and blocking sunlight. Pleated blinds, Venetian blinds, and day-night blinds all adjust the blocking position by raising or lowering the bottom of the curtain. However, the top of the curtain in this type of structure is always blocked. The top of the curtain cannot be raised or lowered, which cannot meet the user's needs and the control method is limited.

[0003] To address the aforementioned issues, the State Intellectual Property Office published publication number CN213450157 on June 15, 2021. U's patent document discloses a dual-track, dual-control curtain, including a first guide rail, a second guide rail, a first control mechanism, a second control mechanism, and a curtain body. The first control mechanism is disposed on the first guide rail, and the second control mechanism is disposed on the second guide rail. The first and second guide rails are arranged vertically. The first control mechanism is provided with a first rope and multiple synchronously moving first rope winders. One end of the first rope is connected to the first rope winder, and the other end passes through the second guide rail and is connected to the upper or lower end of the curtain body to control the vertical movement of the upper or lower end of the curtain body. The second guide rail is provided with a second rope and a second rope winder. One end of the second rope is connected to the second rope winder, and the other end is connected to the lower or upper end of the curtain body to control the vertical movement of the lower or upper end of the curtain body. By forming upper and lower guide rails, and respectively providing a first control mechanism connected to the upper end of the curtain body and a second control mechanism connected to the lower end of the curtain body on the upper and lower guide rails, the upper and lower ends of the curtain body can be controlled simultaneously, allowing the curtain to be suspended at different heights. The left control head is provided with a first shaft core, which is connected in series with a first limiter and a plurality of first rope winders. The first shaft core drives the first limiter and the first rope winders to move, thereby forming the transmission control of the first control mechanism. The right control head is provided with a second shaft core, which is connected in series with a second limiter and a plurality of second rope winders. The second shaft core drives the second limiter and the second rope winders to move, thereby forming the transmission control of the second control mechanism.

[0004] It is evident that the aforementioned patent document employs a dual-track, dual-control method with two limiters. Using two independent limiters, they cannot mutually restrict the travel distance during operation. When the bottom track of the curtain moves upwards to support the top track, causing the lifting rope of the top track lifting coiler to lose its weight, if the bottom track continues to move upwards, the lifting rope of the top track lifting coiler will slacken. This can easily lead to chaotic rope arrangement in the top track lifting coiler of the day / night curtain, causing malfunctions and affecting its normal use.

[0005] Therefore, in order to solve the problems of slack lifting rope and tangled rope arrangement in the top rail lifting reel, it is urgent to develop a limiter that can correlate and synchronize the movement of the two rails. This is a problem that needs to be solved in the current day and night curtain products. Summary of the Invention

[0006] The purpose of this invention is to provide a dual-track dual-control linkage limiter for day and night curtains. This limiter can realize dual-track linkage to solve the problems of slack lifting rope and rope disorder in the top rail lifting reel.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0008] A dual-track, dual-control, interconnected limiter for day and night curtains includes a limit seat, a downward stop block, an upward stop block, a main screw, a main gear, an auxiliary screw, and an auxiliary gear. The side wall of the limit seat has a main threaded through hole and an auxiliary threaded through hole. One end of the main screw is inserted into and threadedly connected to the main threaded through hole. The main gear is fixedly mounted on the main screw. The main screw has a main through hole that passes through the main spindle driving the curtain bottom track lifting and winding device, and the main screw can slide along the main spindle. The main gear meshes with the auxiliary gear. The auxiliary gear has a threaded through hole through which it passes through the auxiliary screw and... It is threadedly connected to an auxiliary screw, one end of which is inserted into and threadedly connected to an auxiliary threaded through hole. The auxiliary screw has an auxiliary through hole that passes through the auxiliary spindle of the curtain top rail lifting and lowering reel, and the auxiliary screw can slide along the auxiliary spindle. The main screw has a downward stop protrusion. When the main spindle drives the curtain bottom rail downwards, it simultaneously drives the main screw to rotate. A fixed limit seat causes the threaded main screw to slide along the main spindle. The main screw drives the main gear to rotate and move simultaneously, and the main gear drives the auxiliary gear to rotate. The auxiliary gear moves synchronously along the auxiliary screw with the main gear. The auxiliary screw's cam follows the main screw. When the curtain bottom rail reaches its lowest position, the downward stop block blocks the cam to prevent the main screw and main spindle from continuing to rotate. The other end of the auxiliary screw has an upward stop cam and a synchronous linkage cam. The end face of the auxiliary gear has a synchronous linkage block. When the main spindle drives the curtain bottom rail upward, it simultaneously drives the main screw to rotate in the opposite direction. The fixed limit seat causes the threaded main screw to slide in the opposite direction along the main spindle. The main screw drives the main gear to rotate and move in the opposite direction simultaneously. The main gear drives the auxiliary gear to rotate in the opposite direction, and the auxiliary gear moves along the auxiliary screw in sync with the main gear. The steps move in the opposite direction, and the synchronous linkage block moves together with the auxiliary gear. When the lifting rope of the curtain top rail lifting reel loses the weight of the curtain top rail, the synchronous linkage block contacts the synchronous linkage protrusion and moves the synchronous linkage protrusion to drive the auxiliary screw to rotate synchronously with the auxiliary gear. The auxiliary screw drives the auxiliary spindle, so that the auxiliary spindle rotates synchronously with the main spindle. The fixed limit seat causes the threaded auxiliary screw to slide along the auxiliary spindle. The upward stop protrusion moves together with the auxiliary screw. When the curtain top rail moves to the top position, the upward stop block blocks the upward stop protrusion to prevent the auxiliary spindle and the main spindle from continuing to rotate.

[0009] Furthermore, the downward stop block is located on the side wall of the limiting seat.

[0010] Furthermore, it also includes a packaging box, with an insertion hole on one end face of the packaging box, and a main spindle through hole and an auxiliary spindle through hole on the other end face of the packaging box. The limiting seat is provided with a connector, and the limiting seat is located inside the packaging box so that the connector is inserted into the insertion hole. The main gear, the auxiliary gear and the upward stop block are located inside the packaging box.

[0011] Furthermore, the packaging box includes an upper box body and a lower box body. The bottom sides of the upper box body are provided with hooks, and the top sides of the lower box body are provided with slots. The hooks are engaged in the corresponding slots to engage the upper box body and the lower box body together. The upward stop block is located on the bottom surface of the lower box body and is located near the end of the packaging box that has the main spindle through-hole and the auxiliary spindle through-hole.

[0012] Furthermore, a main rotating sleeve is provided at the main spindle through-hole, and the main spindle passes through the non-circular through-hole of the main rotating sleeve; an auxiliary rotating sleeve is provided at the auxiliary spindle through-hole, and the auxiliary spindle passes through the non-circular through-hole of the auxiliary rotating sleeve.

[0013] Furthermore, guide positioning plates are provided on the bottom sides of the upper box and between the two hooks, and guide positioning grooves are provided on the top sides of the lower box and between the two slots. The guide positioning plates are located in the guide positioning grooves to align the hooks with the slots.

[0014] Furthermore, the bottom surface of the limiting seat is provided with two plug-in blocks and a socket, the socket being located between the two plug-in blocks. The bottom surface of the lower box body is provided with two slots and a plug-in post. The two plug-in blocks are inserted into the slots, and the plug-in post is inserted into the socket, so as to fix the limiting seat on the bottom surface of the limiting seat.

[0015] Furthermore, the other end of the main screw is a D-shaped shaft, and a boss is provided on the D-shaped shaft near the external thread of the main screw. The downward stop protrusion is provided on the side wall of the boss. One end of the main gear is provided with a fixing sleeve. The main gear and the fixing sleeve are integrally formed. The through hole of the fixing sleeve is a D-shaped hole that is adapted to the D-shaped shaft. The fixing sleeve is inserted into the D-shaped shaft.

[0016] Furthermore, the fixing sleeve has a fixing hole, and the screw passes through the fixing hole and is threaded to the D-shaped shaft to fix the main gear.

[0017] Furthermore, the surface of the upper box has an adjustment observation window.

[0018] The beneficial effects of this invention are as follows:

[0019] The limiter of this patent adopts the above-mentioned technical solution, realizing the correlation limit control of dual rails and dual control. When the lifting rope of the top rail lifting winder loses the gravity of the top rail of the curtain, the limiter enables the dual rails to achieve synchronous linkage, thereby completely solving the problem of slack and rope disorder of the lifting rope of the top rail lifting winder, making the operation of the day and night curtain safer and more reliable.

[0020] Because the two tracks share a single limiter, the components of the day and night blinds are simplified, reducing costs.

[0021] This patented limiter consists of only one housing, two screws, and two gears, and features a simple and compact structure, convenient installation, long service life, and safe and reliable operation.

[0022] This patented limiter also has the function of limiting the upward and downward travel of the curtain body, which greatly improves operational safety.

[0023] The use of this limiter allows the dual-track, dual-control day and night blinds to retain their original functions. It can still control the upper and lower ends of the blind body, allowing the blind to be suspended at different heights. It can not only adjust the height below the suspended position, but also adjust the size of the area covered above the upper part of the blind body. The position and height of the blind can be adjusted according to different lighting conditions to form blinds that open from both the top and bottom or from one side. Compared with existing bottom-opening and lifting blinds, its control is more flexible and the operation is more convenient. Attached Figure Description

[0024] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort:

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 for Figure 1 The exploded view shown;

[0027] Figure 3 for Figure 1 The diagram shows the structure of the limiting seat;

[0028] Figure 4 for Figure 3 The side view shown;

[0029] Figure 5 for Figure 3 The bottom view shown;

[0030] Figure 6 for Figure 2The diagram below shows the structure of the lower box.

[0031] Figure 7 for Figure 2 The diagram shows the structure of the main gear.

[0032] Figure 8 for Figure 2 The diagram shows the structure of the auxiliary gear.

[0033] Figure 9 for Figure 2 The diagram shows the structure of the main screw.

[0034] Figure 10 for Figure 2 The diagram shows the structure of the auxiliary screw.

[0035] In the diagram: 1. Limit seat; 2. Downward stop block; 3. Upward stop block; 4. Main screw; 5. Main gear; 6. Auxiliary screw; 7. Auxiliary gear; 8. Encapsulation box; 9. Upper box body; 10. Lower box body; 11. Hook; 12. Slot; 13. Main spindle through-hole; 14. Auxiliary spindle through-hole; 15. Main rotating sleeve; 16. Main spindle; 17. Auxiliary rotating sleeve; 18. Auxiliary spindle; 19. Insertion hole; 20. Insertion connector; 21. Main thread through-hole; 22. Auxiliary threaded through hole; 23. Main through hole; 24. Threaded through hole; 25. Auxiliary through hole; 26. Downward stop protrusion; 27. D-shaped shaft; 28. Boss; 29. ​​Fixing sleeve; 30. D-shaped hole; 31. Upward stop protrusion; 32. Synchronous linkage protrusion; 33. Synchronous linkage lever; 34. Guide positioning plate; 35. Guide positioning groove; 36. Insertion block; 37. Insertion hole; 38. Slot; 39. Insertion post; 40. Weightless clutch; 41. Debugging observation window. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper surface," "lower surface," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "forward," "reverse," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] like Figure 1 , 2 As shown, a day and night curtain dual-track dual-control associated limiter includes a limit seat 1, a downward stop block 2, an upward stop block 3, a main screw 4, a main gear 5, an auxiliary screw 6, an auxiliary gear 7, and a packaging box 8. The downward stop block 2 is located on the side wall of the limit seat 1, and the main gear 5, the auxiliary gear 7, and the upward stop block 3 are located inside the packaging box 8.

[0039] The packaging box 8 includes an upper box body 9 and a lower box body 10. The bottom sides of the upper box body 9 are provided with hooks 11, and the top sides of the lower box body 10 are provided with slots 12. The hooks 11 are engaged in the corresponding slots 12 to engage the upper box body 9 and the lower box body 10 together.

[0040] The encapsulation box 8 has an insertion hole 19 on one end face and a main spindle through-hole 13 and an auxiliary spindle through-hole 14 on the other end face. The upward stop block 3 is located on the bottom surface of the lower box body 10 and is close to the end of the encapsulation box with the main spindle through-hole 13 and the auxiliary spindle through-hole 14. A main rotating sleeve 15 is provided at the main spindle through-hole 13. The main spindle 16 passes through the non-circular through hole of the main rotating sleeve 15 and rotates together with the main spindle 16. An auxiliary rotating sleeve 17 is provided at the auxiliary spindle through-hole 14. The auxiliary spindle 18 passes through the non-circular through hole of the auxiliary rotating sleeve 17 and rotates together with the auxiliary spindle 18.

[0041] like Figure 2 As shown, the limiting seat 1 is provided with a connector 20. The limiting seat 1 is located inside the packaging box 8 and the connector 20 is inserted into the connector hole 19.

[0042] like Figure 3 , 4As shown in Figures 5 and 6, the side wall of the limiting seat 1 is provided with a main threaded through hole 21 and an auxiliary threaded through hole 22. The bottom surface of the limiting seat 1 is provided with two plug-in blocks 36 and a plug hole 37. The plug hole 37 is located between the two plug-in blocks 36. The bottom surface inside the lower box 10 is provided with two slots 38 and plug-in pins 39. The two plug-in blocks 36 are inserted into the slots 38, and the plug-in pins 39 are inserted into the plug hole 37, thereby fixing the limiting seat 1.

[0043] One end of the main screw 4 is inserted into the main threaded through hole 21 and threadedly connected to the main threaded through hole 21. The main gear 5 is fixedly installed on the main screw 4. The main screw 4 has a main through hole 23, which is inserted into the main spindle 16 of the drive curtain bottom rail lifting and winding device, and the main screw 4 can slide along the main spindle 16. The main gear 5 meshes with the auxiliary gear 7. The auxiliary gear 7 has a threaded through hole 24, which is inserted into the auxiliary screw 6 and threadedly connected to the auxiliary screw 6. One end of the auxiliary screw 6 is inserted into the auxiliary threaded through hole 22 and threadedly connected to the auxiliary threaded through hole 22. The auxiliary screw 6 has an auxiliary through hole 25, which is inserted into the auxiliary spindle 18 of the drive curtain top rail lifting and winding device, and the auxiliary screw 6 can slide along the auxiliary spindle 18.

[0044] The auxiliary spindle 18 and the main spindle 16 have non-circular cross-sections, and the auxiliary through hole 25 and the main through hole 23 are also non-circular. This design is to make the main screw 4 and the auxiliary screw 6 rotate together with the main spindle 16 and the auxiliary spindle 18 respectively, so as to prevent relative slippage.

[0045] like Figure 7 , 8 As shown in Figures 9 and 10, the main screw 4 is provided with a downward stop protrusion 26. Specifically, the other end of the main screw 4 is a D-shaped shaft 27. A boss 28 is provided on the D-shaped shaft 27 near the external thread of the main screw 4. The downward stop protrusion 26 is provided on the side wall of the boss 28. One end of the main gear 5 is provided with a fixing sleeve 29. The main gear 5 and the fixing sleeve 29 are integrally formed. The through hole of the fixing sleeve 29 is a D-shaped hole 30. The fixing sleeve 29 is inserted into the D-shaped shaft 27 and fixed with screws.

[0046] When the main spindle 16 drives the bottom rail of the curtain to move downwards, it simultaneously drives the main screw 4 to rotate. The fixed limit seat 1 causes the main screw 4, which is threaded to it, to slide along the main spindle 16. The main screw 4 drives the main gear 5 to rotate and move simultaneously. The main gear 5 drives the auxiliary gear 7 to rotate. The auxiliary gear 7 moves synchronously along the auxiliary screw 6 and the main gear 5. The downward stop protrusion 26 moves with the main screw 4. When the bottom rail of the curtain moves to the lowest position, the downward stop block 2 blocks the downward stop protrusion 26 to prevent the main screw 4 and the main spindle 16 from continuing to rotate. The other end of the auxiliary screw 6 is provided with an upward stop protrusion 31 and a synchronous linkage protrusion 32. The end face of the auxiliary gear 7 is provided with a synchronous linkage lever 33. When the main spindle 16 drives the bottom rail of the curtain to move upwards, it simultaneously drives the main screw 4 to rotate in the opposite direction. The fixed limit seat 1 causes the main screw 4, which is threaded to it, to slide along the main spindle 1. The main screw 4 slides in the opposite direction along the main spindle 16. The main screw 4 drives the main gear 5 to rotate and move in the opposite direction simultaneously. The main gear 5 drives the auxiliary gear 7 to rotate in the opposite direction. The auxiliary gear 7 moves in the opposite direction synchronously with the main gear 5 along the auxiliary screw 6. The synchronous linkage block 33 moves together with the auxiliary gear 7. When the bottom rail of the curtain moves up to support the top rail of the curtain, so that the lifting rope of the top rail lifting winder loses the weight of the top rail of the curtain, the synchronous linkage block 33 contacts the synchronous linkage protrusion 32 and moves the synchronous linkage protrusion 32 to drive the auxiliary screw 6 to rotate synchronously with the auxiliary gear 7. The auxiliary screw 6 drives the auxiliary spindle 18 to move synchronously with the main spindle 16, so that the bottom rail and the top rail of the curtain move upward synchronously. This avoids the occurrence of tangled threads due to the lifting rope on the top rail lifting winder becoming loose when the top rail of the curtain is supported.

[0047] The fixed limit seat 1 causes the auxiliary screw 6, which is threaded to it, to slide along the auxiliary spindle 18. The upward stop protrusion 31 moves with the auxiliary screw 6. When the top rail of the curtain moves to the top position, the upward stop block 3 blocks the upward stop protrusion 31 to prevent the auxiliary spindle 18 and the main spindle 16 from continuing to rotate.

[0048] like Figure 2 As shown, guide positioning plates 34 are provided on the bottom sides of the upper box 9 and between the two hooks 11, and guide positioning grooves 35 are provided on the top sides of the lower box 10 and between the two slots 12. The guide positioning plates 34 are located in the guide positioning grooves 35 to align the hooks 11 with the slots 12.

[0049] It also includes a weightless clutch 40, which is used to connect the auxiliary spindle 18 and the auxiliary control head (not shown in the figure). When the bottom rail of the curtain moves up to support the top rail of the curtain, so that the lifting rope of the top rail lifting reel loses the weight of the top rail of the curtain, the weightless clutch 40 disengages the auxiliary spindle 18 and the auxiliary control head. At this time, the power of the auxiliary spindle 18 comes from the main spindle 16, that is, the final power comes from the main control head. After disengagement, the auxiliary spindle 18 is no longer restricted by the auxiliary control head. When the lifting rope of the top rail lifting reel is subjected to the weight of the top rail of the curtain again, the weightless clutch 40 resets and reconnects the auxiliary spindle 18 and the auxiliary control head together.

[0050] The auxiliary spindle 18 and the main spindle 16 rotate synchronously. The auxiliary spindle 18 drives the curtain top rail lifting winder to start synchronously winding the lifting rope, so that the curtain bottom rail and the curtain top rail move upward synchronously to prevent the lifting rope from getting tangled.

[0051] The surface of the upper housing 9 has an adjustment observation window 41, which makes it easy to observe the position of the limiter during adjustment.

[0052] Working Principle: The limiter in this patent is installed on both the auxiliary spindle and the main spindle, meaning it's installed on both tracks simultaneously. This enables interconnected limit control of both tracks. While controlling the main spindle, it also provides real-time linkage control to the auxiliary spindle. When the lifting rope of the top track lifting reel loses the weight of the top track, the limiter synchronizes the two tracks, completely solving the problems of slack and tangled ropes in the top track lifting reel. Furthermore, the biggest advantage of this limiter is that it simplifies the adjustment of day and night curtains. The lifting ropes acting on the bottom and top tracks no longer need to be threaded through the upper track (installation box), greatly improving adjustment efficiency.

[0053] The auxiliary spindle is used to adjust the size of the area covered above the top of the curtain body, while the main spindle is used to adjust the height of the area covered below the suspension position. This allows the lower part of the curtain to be completely closed or partially opened, and the size of the open area can also be adjusted.

[0054] Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of those embodiments or examples, without contradiction. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A day / night curtain dual-track dual-control interconnected limiter, characterized in that: The application relates to a curtain lifting device, which comprises a limiting seat, a down-stopping block, an up-stopping block, a main screw rod, a main gear, an auxiliary screw rod and an auxiliary gear, a main screw thread through hole and an auxiliary screw thread through hole are arranged on the side wall of the limiting seat, one end of the main screw rod is inserted into the main screw thread through hole and is threadedly connected with the main screw thread through hole, the main gear is fixedly installed on the main screw rod, a main through hole is arranged in the main screw rod, the main through hole is inserted into a main shaft of a driving curtain body bottom rail lifting winding device and the main screw rod can slide along the main shaft, the main gear is engaged with the auxiliary gear, a screw thread through hole is arranged on the auxiliary gear, the auxiliary gear is inserted into the auxiliary screw rod through the screw thread through hole and is threadedly connected with the auxiliary screw rod, one end of the auxiliary screw rod is inserted into the auxiliary screw thread through hole and is threadedly connected with the auxiliary screw thread through hole, an auxiliary through hole is arranged in the auxiliary screw rod, the auxiliary through hole is inserted into an auxiliary shaft of a driving curtain body top rail lifting winding device and the auxiliary screw rod can slide along the auxiliary shaft, a down-stopping protrusion is arranged on the main screw rod, when the main shaft drives the curtain body bottom rail to move downwards, the main screw rod is simultaneously rotated, the fixed limiting seat makes the main screw rod threadedly connected therewith slide along the main shaft, the main screw rod drives the main gear to simultaneously rotate and move, the main gear drives the auxiliary gear to rotate, the auxiliary gear moves along the auxiliary screw rod and the main gear synchronously, the down-stopping protrusion moves along with the main screw rod, when the curtain body bottom rail moves to the lowest position, the down-stopping block blocks the down-stopping protrusion to prevent the main screw rod and the main shaft from continuously rotating, the other end of the auxiliary screw rod is provided with an up-stopping protrusion and a synchronous linkage protrusion, a synchronous linkage nub is arranged on the end face of the auxiliary gear, when the main shaft drives the curtain body bottom rail to move upwards, the main screw rod is reversely rotated, the fixed limiting seat makes the main screw rod threadedly connected therewith reversely slide along the main shaft, the main screw rod drives the main gear to reversely rotate and reversely move, the main gear drives the auxiliary gear to reversely rotate, the auxiliary gear reversely moves along the auxiliary screw rod and the main gear synchronously, the synchronous linkage nub moves along with the auxiliary gear, when the lifting rope of the driving curtain body top rail lifting winding device loses the gravity of the curtain body top rail, the synchronous linkage nub contacts and drives the synchronous linkage protrusion to move, so that the auxiliary screw rod is driven to synchronously rotate along with the auxiliary gear, the auxiliary screw rod drives the auxiliary shaft, so that the auxiliary shaft synchronously rotates along with the main shaft, the fixed limiting seat makes the auxiliary screw rod threadedly connected therewith slide along the auxiliary shaft, the up-stopping protrusion moves along with the auxiliary screw rod, when the curtain body top rail moves to the highest position, the up-stopping block blocks the up-stopping protrusion to prevent the auxiliary shaft and the main shaft from continuously rotating, the down-stopping block is arranged on the side wall of the limiting seat, a packaging box is further arranged, a plug-in hole is arranged on one end face of the packaging box, a main shaft passing opening and an auxiliary shaft passing opening are formed on the other end face of the packaging box, a plug-in head is arranged on the limiting seat, the limiting seat is arranged in the packaging box and the plug-in head is plugged into the plug-in hole, the main gear, the auxiliary gear and the up-stopping block are arranged in the packaging box.

2. The dual-track dual-control associated type position limiter for day and night curtain according to claim 1, characterized in that: The packaging box comprises an upper box body and a lower box body, the two side bottoms of the upper box body are provided with clamping hooks, the two side tops of the lower box body are provided with clamping grooves, the clamping hooks are clamped in the corresponding clamping grooves, and the upper box body and the lower box body are clamped together.

3. The dual-track dual-control associated type position limiter for day and night curtain according to claim 2, characterized in that: The main shaft passes through the non-circular through hole of the main rotating sleeve, and the auxiliary shaft passes through the non-circular through hole of the auxiliary rotating sleeve.

4. The dual-track dual-control associated type position limiter for day-and-night curtain according to claim 3, characterized in that: The two side bottoms of the upper box body and located between the two clamping hooks are provided with guiding positioning plates, and the two side tops of the lower box body and located between the two clamping grooves are provided with guiding positioning grooves.

5. The dual-track dual-control associated type position limiter of the day and night curtain according to claim 4, characterized in that: The bottom surface of the limiting seat is provided with two insertion blocks and an insertion hole, the insertion hole is located between the two insertion blocks, the bottom surface in the lower box body is provided with two insertion grooves and an insertion column, the two insertion blocks are inserted into the insertion grooves, and the insertion column is inserted into the insertion hole, so that the limiting seat is fixed on the bottom surface of the limiting seat.

6. The dual-track dual-control associated type position limiter for day and night curtain according to claim 1, characterized in that: The other end of the main screw rod is a D-shaped shaft, a boss is arranged on the D-shaped shaft and close to the external thread of the main screw rod, the descending stop protrusion is arranged on the side wall of the boss, one end of the main gear is provided with a fixing sleeve, the main gear is integrally formed with the fixing sleeve, the through hole of the fixing sleeve is a D-shaped hole matched with the D-shaped shaft, and the fixing sleeve is inserted on the D-shaped shaft.

7. The dual-track dual-control associated type position limiter of the day and night curtain according to claim 6, characterized in that: The fixing sleeve is provided with a fixing hole, a screw is threadedly connected with the D-shaped shaft through the fixing hole, and the main gear is fixed.

8. The dual-track dual-control associated type position limiter for day and night curtain according to claim 2, characterized in that: The surface of the upper box body is provided with a debugging observation window.

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