Piezo-Based Encoder with Magnetic Brake for Powered Window Closing
Inactive Publication Date: 2007-12-06
SOMFY SAS
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- Application Information
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Benefits of technology
"The patent describes a device for determining the position, speed, and direction of a movable member, such as window coverings or screens. The device includes a motor and an actuator coupled to the object to move it when the motor is energized. A magnet is magnetically coupled to the rotating member and a piezosensitive element cooperates with the magnet to output signals when the rotating member rotates. The signals are useful in determining the position, speed, and direction of rotation of the motor. The device can be powered by an electric signal output from a previously defined device for controlling the electric power supply of an element of a motor. The powered assembly includes an object that can be moved between a first configuration and a second configuration, and the device can be used to determine the position, speed, and direction of rotation of the object. The device can be used to control the power supply of the object and can be powered by a primary dc battery. The invention provides a solution for controlling the movement of objects using a motor and actuator."
Problems solved by technology
These systems have drawbacks.
Method used
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[0027] Referring initially to FIG. 1, a motorized window covering is shown, generally designated 10, that includes an actuator such as a rotatable rod 12 of a window covering 14, such as but not limited to a shade assembly having raisable (by rolling up) and lowerable (by rolling down, or unrolling) shade 16. As shown, the tilt rod 12 is rotatably mounted by means of a block 18 in a head rail 20 of the window covering 14.
[0028] While a roll-up shade is shown, it is to be understood that the principles herein apply to a wide range of window coverings and other objects that are to be moved by motors. For example, the invention applies to raisable and lowerable pleated shades and cellular shades such as those commonly marketed under the trade names “Silhouette”, “Shangri-La”, etc. as well as to projector screens, awnings, etc. that can be raised and lowered. Moreover, while needed less in applications that require only tilting slats such as in horizontal blinds, the invention may also...
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The device (1) comprises a frame (42) comprising a static magnetic pole (48), a movable member (44) relatively to the frame (42), the movable member (44) comprising a moving magnetic pole (46), the static magnetic pole (48) and the moving magnetic pole (46) being magnetically coupled in some position of the movable member (44), a piezosensitive element (50) so that the force due to the magnetic coupling between the moving magnetic pole (46) and the static magnetic pole (48) reacts on the piezosensitive element (50), and means (52, 54, 56, 58) for outputting an electric signal from the piezosensitive element (50), the signal being useful in determining the position and / or the speed and / or the direction of the movable member (44).
Description
FIELD OF THE INVENTION [0001] The present invention relates generally to motorized window coverings, awnings, security screens, projection screens, and the like. BACKGROUND OF THE INVENTION [0002] The present assignee has provided several systems for either lowering or raising a window covering, or for moving the slats of a window covering between open and closed positions, under control of a hand-held remote or other control device. These systems include a motor that is coupled through gears to the window covering activation mechanism. When the motor is energized in response to a user command signal, the activation mechanism moves the window covering. Such assemblies are disclosed in U.S. Pat. No. 6,433,498, incorporated herein by reference. [0003] The present assignee has also provided systems for determining the position of the window coverings based on counting motor pulses, and for braking the motor from turning when it is not energized. By knowing the position of the window co...
Claims
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IPC IPC(8): G01D5/14G01B7/00E04F10/06E06B9/68H02K7/106H02K11/00
CPCE04F10/06E06B9/68H02K11/0068H02K7/106H02K11/0015G01D5/18H02K11/21H02K11/30H02K21/16H02K49/10H02K1/278H02K7/1021H02K2207/03G01P3/44G01P3/48G01P13/04G01D5/185
Inventor CAVAREC, PIERRE-EMMANUELWALKER, WINSTON G.
Owner SOMFY SAS