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US-12624593-B2 - Motorized venetian blind

US12624593B2US 12624593 B2US12624593 B2US 12624593B2US-12624593-B2

Abstract

A motorized venetian blind includes a first lifting electric machine, a second lifting electric machine and a tilting electric machine for respectively control a front pull cord, a rear pull cord and a ladder cord. When a front warp and a rear warp of the ladder cord are controlled by the tilting electric machine to move downwardly and upwardly respectively to tilt the slats to the closed position, one of the pull cords on the same side as the upwardly-moving warp is controlled by the first lifting electric machine or the second lifting electric machine to move upwardly along with the upwardly-moving warp. Therefore, the synchronization of the pull cords and the ladder cord is improved, whereby closure between the slats is enhanced, and the bottom rail can be fully tilted to be mostly vertical, partially overlapping the neighboring slat for preventing light leakage.

Inventors

  • Lin Chen
  • JIAN ZENG

Assignees

  • NIEN MADE ENTERPRISE CO., LTD.

Dates

Publication Date
20260512
Application Date
20240709
Priority Date
20230720

Claims (15)

  1. 1 . A motorized venetian blind, comprising: a headrail; a bottom rail, situated below the headrail through a front pull cord and a rear pull cord which are respectively connected to a first reeling wheel and a second reeling wheel, wherein the first reeling wheel and the second reeling wheel are disposed on the headrail; plural slats, suspended by a ladder cord and located between the headrail and the bottom rail, wherein the ladder cord comprises a front warp and a rear warp each have one end connected to a tilting wheel disposed on the headrail; the plural slats are located between the front warp and the rear warp; the front warp and the front pull cord pass one side of the slats, and the rear warp and the rear pull cord pass the other side of the slats; a first lifting electric machine, configured to control the first reeling wheel to rotate for performing one of retracting the front pull cord and releasing the front pull cord; a second lifting electric machine, configured to control the second reeling wheel to rotate for performing one of retracting the rear pull cord and releasing the rear pull cord; and a tilting electric machine, configured to control the tilting wheel to rotate for generating a relative movement that is substantially vertical of the front warp and the rear warp of the ladder cord, whereby the slats are tilted between a horizontal position and a closed position; wherein when the front pull cord and the rear pull cord are concurrently retracted or when the front pull cord and the rear pull cord are concurrently released, the bottom rail is moved between an upper limit position and a lower limit position, wherein the upper limit position is close to the headrail and the lower limit position is distanced from the headrail; when one of the front warp and the rear warp is moved upwardly for tilting the slats from the horizontal position to the closed position, the front pull cord or the rear pull cord on a same side as the one of the front warp and the rear warp that is moved upwardly is also moved upwardly, making the bottom rail tilt towards a same direction as a tilting direction of the slats to a substantially vertical position and partially overlap an adjacent one of the slats.
  2. 2 . The motorized venetian blind of claim 1 , wherein the headrail has a datum surface, and the front pull cord, the rear pull cord, the front warp and the rear warp pass through the datum surface; if the front pull cord is the one of the front pull cord and the rear pull cord that is moved upwardly, an amount of upward movement with respect to the datum surface of the front pull cord is greater than an amount of upward movement with respect to the datum surface of the front warp; if the rear pull cord is the one of the front pull cord and the rear pull cord that is moved upwardly, an amount of upward movement with respect to the datum surface of the rear pull cord is greater than an amount of upward movement with respect to the datum surface of the rear warp.
  3. 3 . The motorized venetian blind of claim 1 , wherein the headrail has a datum surface, and the front pull cord, the rear pull cord, the front warp and the rear warp pass through the datum surface; if the front pull cord is the one of the front pull cord and the rear pull cord that is moved upwardly, an amount of upward movement with respect to the datum surface of the front pull cord is substantially equal to an amount of upward movement with respect to the datum surface of the front warp; if the rear pull cord is the one of the front pull cord and the rear pull cord that is moved upwardly, an amount of upward movement with respect to the datum surface of the rear pull cord is substantially equal to an amount of upward movement with respect to the datum surface of the rear warp.
  4. 4 . The motorized venetian blind of claim 1 , wherein the headrail has a datum surface, and the front pull cord, the rear pull cord, the front warp and the rear warp pass through the datum surface; if the front pull cord is the one of the front pull cord and the rear pull cord that is moved upwardly, an amount of upward movement with respect to the datum surface of the front pull cord is smaller than an amount of upward movement with respect to the datum surface of the front warp; if the rear pull cord is the one of the front pull cord and the rear pull cord that is moved upwardly, an amount of upward movement with respect to the datum surface of the rear pull cord is smaller than an amount of upward movement with respect to the datum surface of the rear warp.
  5. 5 . The motorized venetian blind of claim 1 , wherein the headrail has a datum surface, and the front pull cord, the rear pull cord, the front warp and the rear warp pass through the datum surface; when the slats are tilted from the horizontal position to the closed position, the other one of the front pull cord and the rear pull cord rather than the one of the front pull cord and the rear pull cord that is moved upwardly is moved downwardly; if the front pull cord is the one moved downwardly, an amount of downward movement with respect to the datum surface of the front pull cord is substantially equal to an amount of downward movement with respect to the datum surface of the front warp; if the rear pull cord is the one that is moved downwardly, an amount of downward movement with respect to the datum surface of the rear pull cord is substantially equal to than an amount of downward movement with respect to the datum surface of the rear warp.
  6. 6 . The motorized venetian blind of claim 1 , further comprising: a first detector, configured to detect tension of the front pull cord; and a second detector, configured to detect tension of the rear pull cord.
  7. 7 . The motorized venetian blind of claim 6 , wherein when at least one of the first detector and the second detector detects tension smaller than a preset value while the first lifting electric machine and the second lifting electric machine are driving the first reeling wheel and the second reeling wheel to rotate respectively, a first control signal and a second control signal are transmitted to the first lifting electric machine and the second lifting electric machine respectively, whereby the first lifting electric machine and the second lifting electric machine stop controlling the first reeling wheel and the second reeling wheel to rotate respectively.
  8. 8 . The motorized venetian blind of claim 6 , wherein when the first detector and the second detector both detect tension smaller than a preset value while the first reeling wheel and the second reeling wheel are stationary, a first control signal and a second control signal are transmitted to the first lifting electric machine and the second lifting electric machine respectively, whereby the first lifting electric machine and the second lifting electric machine control the first reeling wheel and the second reeling wheel to rotate respectively for concurrently retracting the front pull cord and the rear pull cord, or concurrently releasing the front pull cord and the rear pull cord.
  9. 9 . The motorized venetian blind of claim 6 , wherein a first tilting signal is transmitted in response to only the second detector between the first detector and the second detector detecting tension smaller than a preset value, whereby the tilting electric machine controls the tilting wheel to rotate in a first direction for releasing the front warp and retracting the rear warp; a second tilting signal is transmitted in response to only the first detector between the first detector and the second detector detecting tension smaller than the preset value, whereby the tilting electric machine controls the tilting wheel to rotate in a second direction for retracting the front warp and releasing the rear warp.
  10. 10 . The motorized venetian blind of claim 6 , wherein the first detector and the second detector are disposed on the headrail as the front pull cord passes the first detector after extending out from the first reeling wheel, and the rear pull cord passes the second detector after extending out from the second reeling wheel.
  11. 11 . A motorized venetian blind, comprising: a headrail; a bottom rail, situated below the headrail through a front pull cord and a rear pull cord which are respectively connected to a first reeling wheel and a second reeling wheel, wherein the first reeling wheel and the second reeling wheel are disposed on the headrail; plural slats, suspended by a ladder cord and located between the headrail and the bottom rail, wherein the ladder cord comprises a front warp and a rear warp each have one end connected to a tilting wheel disposed on the headrail; the slats are located between the front warp and the rear warp; the front warp and the front pull cord pass one side of the slats, and the rear warp and the rear pull cord pass the other side of the slats; a first lifting electric machine, configured to control the first reeling wheel to rotate for performing one of retracting the front pull cord and releasing the front pull cord; a second lifting electric machine, configured to control the second reeling wheel to rotate for retracting the rear pull cord and releasing the rear pull cord; a tilting electric machine, configured to control the tilting wheel to rotate for generating a relative movement that is substantially vertical of the front warp and the rear warp of the ladder cord, whereby the slats are tilted between a horizontal position and a closed position; a first detector, configured to detect tension of the front pull cord; a second detector, configured to detect tension of the rear pull cord; and a controller, electrically connected to the first lifting electric machine, the second lifting electric machine and the tilting electric machine; wherein the controller transmits a first tilting signal to make the tilting electric machine control the tilting wheel to rotate in a first direction in response to only the second detector between the first detector and the second detector detecting tension smaller than a preset value while the first reeling wheel and the second reeling wheel are stationary, whereby the rear warp is moved upwardly relative to the front warp to tilt the slats; the controller transmits a second tilting signal to make the tilting electric machine control the tilting wheel to rotate in a second direction in response to only the first detector between the first detector and the second detector detecting tension smaller than the preset value while the first reeling wheel and the second reeling wheel are stationary, whereby the front warp is moved upwardly relative to the rear warp to tilt the slats; wherein either or both of the following situations occur: when the tilting electric machine controls the tilting wheel to tilt the slats to the closed position in response to the first tilting signal from the controller, the controller further controls the second lifting electric machine to drive the second reeling wheel to rotate for retracting the rear pull cord, whereby the bottom rail is tilted towards a same direction as a tilting direction of the slats to a substantially vertical position and partially overlaps an adjacent one of the slats, or/and when the tilting electric machine controls the tilting wheel to tilt the slats to the closed position in response to the second tilting signal from the controller, the controller further controls the first lifting electric machine to drive the first reeling wheel to rotate for retracting the front pull cord, whereby the bottom rail is tilted towards the same direction as the tilting direction of the slats to the substantially vertical position and partially overlaps an adjacent one of the slats.
  12. 12 . The motorized venetian blind of claim 11 , wherein the headrail has a datum surface, and the front pull cord, the rear pull cord, the front warp and the rear warp pass through the datum surface; when the controller controls the tilting electric machine to drive the tilting wheel to rotate in the first direction and controls the second lifting electric machine to drive the second reeling wheel to rotate for retracting the rear pull cord, an amount of upward movement with respect to the datum surface of the rear pull cord is greater than an amount of upward movement with respect to the datum surface of the rear warp; when the controller controls the tilting electric machine to drive the tilting wheel to rotate in the second direction and controls the first lifting electric machine to drive the first reeling wheel to rotate for retracting the front pull cord, an amount of upward movement with respect to the datum surface of the front pull cord is greater than an amount of upward movement with respect to the datum surface of the front warp.
  13. 13 . The motorized venetian blind of claim 11 , wherein the controller further controls the first lifting electric machine to drive the first reeling wheel to rotate for releasing the front pull cord in response to the second detector detecting tension smaller than the preset value while the first reeling wheel and the second reeling wheel are stationary; the controller further controls the second lifting electric machine to drive the second reeling wheel to rotate for releasing the rear pull cord in response to the first detector detecting tension smaller than the preset value while the first reeling wheel and the second reeling wheel are stationary.
  14. 14 . The motorized venetian blind of claim 13 , wherein the headrail has a datum surface, and the front pull cord, the rear pull cord, the front warp and the rear warp pass through the datum surface; when the controller controls the tilting electric machine to drive the tilting wheel to rotate in the first direction and controls the first lifting electric machine to drive the first reeling wheel to rotate for releasing the front pull cord, an amount of downward movement with respect to the datum surface of the front pull cord is greater than an amount of downward movement with respect to the datum surface of the front warp; when the controller controls the tilting electric machine to drive the tilting wheel to rotate in the second direction and controls the second lifting electric machine to drive the second reeling wheel to rotate for releasing the rear pull cord, an amount of downward movement with respect to the datum surface of the rear pull cord is greater than an amount of downward movement with respect to the datum surface of the rear warp.
  15. 15 . The motorized venetian blind of claim 11 , wherein the controller controls the first lifting electric machine to change a motion state of the first reeling wheel and controls the second lifting electric machine to change a motion state of the second reeling wheel in response to the first detector and the second detector both detecting tension smaller than the preset value for performing one of releasing the front pull cord and the rear pull cord concurrently, retracting the front pull cord and the rear pull cord concurrently, and stopping the front pull cord and the rear pull cord from moving.

Description

BACKGROUND OF THE DISCLOSURE 1. Field of the Disclosure The present disclosure generally relates to a venetian blind, and more particularly relates to a motorized venetian blind with its slats closing well with each other when the motorized venetian blind is extended and its slats have been tilted to a closed position. 2. Description of the Prior Art Venetian blinds are a type of window blind with covering material composed of multiple slats shaped like elongated plates and arranged in the horizontal direction. Those slats are suspended by a ladder cord to be located between an upper rail and a lower rail of the venetian blind. To operate the venetian blind, a lifting pull cord is utilized to move the lower rail upward or downward while the lower rail remains level, allowing the slats to be stacked from bottom to top or to extend from top to bottom, whereby the slats become arranged at intervals. According to the common usage habits of most users, the purpose of retracting the covering material is to allow light beams to pass, and the purpose of extending the covering material is to shield light beams. In order to achieve better control of lighting effects, while extending the covering material, the user usually drops down the lower rail to the lowest position as a first step, then operating a slat-angle adjusting mechanism to make one of the two warps of the ladder cord move upward and the other one of the two warps move downward, thereby generating a difference in the heights of the front and rear sides of the slats. Therefore, a tilting angle of the slats is adjusted to achieve the purpose of adequately altering the amount of light passing through the covering material. For current venetian blinds, operating the lifting pull cord manually or under electrical control can move the lower rail upward or downward for extending or retracting the covering material. Alternatively, driving the two warps of the ladder cord with one of the warps moving upward and the other moving downward, can achieve the purpose of altering the tilting angle of the slats. The aforesaid operations of the extension and retraction of the covering material, and the aforesaid operation of altering the tilting angle of the slats, are separately performed by two independent mechanisms. Therefore, the movement of the lifting pull cord could be asynchronous with the movement of the warps of the ladder cord. In that case, when the tilting angle of the slats has been adjusted to exhibit the slats in the closed position where the slats are expected to completely shield light, the up-and-down neighboring slats usually do not close well with each other, which causes light leakage. This situation of light leakage can be even more obvious in the venetian blinds with multiple lifting pull cords in the front-and-rear configuration. For instance, when the lower rail of the venetian blind has been dropped to the lowest position, the lifting pull cords are fully released as reaching their maximum released lengths. At this moment, the user operates the slat-angle adjusting mechanism to drive one of the two warps of the ladder cord to move upward and drive the other one of the two warps to move downward, in which one side of the lower rail corresponding to the upward-moving warp is not restricted by the corresponding lifting pull cord and capable of moving freely, whereas the other side of the lower rail corresponding to the downward-moving warp is restricted by the maximum released length of the corresponding lifting pull cord, not being able to fully descend along with the downward-moving warp. As a result, the difference in height between the two sides of the lower rail (i.e., the front and rear sides of the lower rail) would be insufficient. While the upper slats, due to their distances from the lower rail, can still be tilted to the mostly vertical position, enabling them to fully close against the neighboring slats, the decrease in the tilting angle of the slats becomes more pronounced as the slats get closer to the lower rail. Especially the lower rail itself, the tilting angle of which usually undergoes slight changes only and results in light leakage. Additionally, the volume and shape of the lower rail are generally different from the slat, and the weight of the lower rail is usually largely greater than the weight of the single slat, causing the center of gravity of the lower rail to be inconsistent with the centers of gravity of the slats while the tilting angle of the slats is adjusted. Thus, it is difficult to adjust the tilting angle of the lower rail to be consistent with the tilting angle of the slats synchronously. In conclusion, light leakage caused by the lower rail not closing well with the neighboring slat is one of the urgent problems of the current venetian blind products. SUMMARY OF THE DISCLOSURE In light of the above reasons, one aspect of the present disclosure is to provide a motorized venetian blind, in which when the motor