141 results about "Constant linear velocity" patented technology

Presented is a roller shade system that includes a flexible shade material having a lower end, a rotatably supported roller tube that windingly receives the shade material, a stepper motor that operably engages the roller tube to rotate the roller tube to move the lower end of the shade material between a first position and a second position, an optical sensor configured for capturing an image frame of the shade material at linear positions along the shade material as the lower end of the flexible shade material moves from the first position to the second position, and a stepper motor controller configured for controlling the frequency of input pulses to the stepper motor to move the lower end of the flexible shade material from the first position to the second position at a substantially constant linear velocity in response to position information obtained from the plurality of captured image frames.

The invention discloses an intelligent rewinding machine with constant linear velocity, constant tension and fixed wire length, comprising a linear velocity sensor, a tension automatic controller and a single spindle transmission control device, wherein a transmission cone table is directly fixed on an output shaft of a motor; a movable cone table is movably connected with a handle via a pin; the linear velocity sensor has the functions of detecting broken lines, linear velocity and length counting. When a tension detecting hook on the tension automatic controller detects that the tension of yarns is oversize, a swinging arm is controlled to rotate an angle so as to reduce the yarn bending degree of the flowing yarns and reduce the winding tension of the yarns, and vice versa. A computer controller on the single spindle transmission control device receives signals sent by the linear velocity sensor and controls the rotation speed and the broken lines of the motor to warn. As the gradual increasing winding diameter of the tube, the rotation speed of the tube is controlled to gradually slow, so that the winding linear velocity is constant; when the length of the yarns reaches the set value or the broken line signal is received, the power supply of the motor is cut off and the warning light twinkles.

A method and apparatus for recording data wherein the amount of light reflected from a disk is detected, and it is determined according to the amount of reflected light whether the disk is a recordable disk or a rewritable disk. The disk is controlled according to the result of determination such that it is rotated at a constant angular velocity (CAV) or at a constant linear velocity (CLV) and recording is executed. Further, rotation driving control of the disk is selected according to factors other than the type of the disk, such as according to whether random recording is allowed or not, according to a recording state in the disk, according to whether an alternative area is provided or not, according to a recording start position, or according to whether initialization is required or not. CLV control or CAV control is appropriately selected for a disk at recording to suppress a reduction in accessibility and a reduction in data transmission rate.

A two-dimensional field of regard is scanned with a single plane mirror in the object space of a telescope, maintaining a fixed relationship between the rotational direction of scan and the projection of the telescope's focal plane. The two dimensional field of regard is covered by a series of conical arcs, each arc being scanned by rotation at constant angular velocity about the inner axis of the two-axis system. This scanning system accommodates applications such as TDI that require an opto-mechanical scan with a constant linear velocity (magnitude and direction) in the focal plane. Shading of IR images is mitigated by calibration at the ends of each scan line and by a scan geometry that minimizes changes in reflection angle.

The invention discloses a constant-linear-velocity warp pacing device for weaving of crinkled crepe fabric. The device comprises a tooth form warp beam disc, crepe warps, a stopping hook, a rotary shaft, a dual-tension rod, a tension rod, a check ring, a spring, a gear, a worm, a worm gear, a bevel gear, a carrier gear, a winding gear, a winding rod, a winding wire, a crepe warp beam, a ground warp beam, a heald frame, a shed, wefts, the fabric and a winding roller. The braking resistance of each warp beam is reduced automatically and linearly as the backing-off diameter of the warp beam is reduced, constant warp run-in is realized, and the device has the advantages of being automatic, reliable, capable of achieving linear control and convenient to operate and maintain.

An information recording medium includes data concerning a maximum linear velocity (V1max) and a minimum linear velocity (V1min) at a first location on the medium and a maximum linear velocity (V2max) and a minimum linear velocity (V2min) at a second location on the medium, are recorded at a predetermined location on said medium, and at the first and second locations both of which are located at different locations on the medium, performing selectively CLV/CAV (Constant Linear Velocity/Constant Angular Velocity) control or alternatively a CLV/CAV-hybrid control.

The invention provides a speed-variable supersonic flame spraying spherical device which comprises a revolving platform, an auxiliary belt wheel, a shaft, a sprayer, a ball table, an auxiliary motor belt wheel, an auxiliary motor, a clamp, a head stock, a main motor, a main shaft, a main belt wheel, a main motor belt wheel, a touch screen, a PLC (Programmable Logic Controller), a main frequency converter, an auxiliary frequency converter and the like, wherein the ball table, the clamp, the main shaft and the main belt wheel are connected, the main shaft passes through the head stock, the main motor is connected with the main motor belt wheel, the sprayer is fixed on the revolving platform, the auxiliary belt wheel, the shaft and the revolving platform are connected, the auxiliary motor is connected with the auxiliary motor belt wheel, the touch screen and the PLC are both electrically connected with the main frequency converter, the main motor and the auxiliary frequency converter by leads, the PLC is provided with a program which can generate continuously changing angular velocity according to the change of the turning radius of each point on a spherical surface, but keeps a constant linear velocity, as well as is provided with a constant rotating speed program of the sprayer, and moreover, a function relation exists between the angular velocity of the spherical surface and the rotating angle of the sprayer. Uniform and consistent coatings with required thickness can be obtained by selecting proper rotating velocity programs of the main shaft and the revolving platform on the touch screen.

Embodiments of the invention generally provide an electron beam substrate processing system. In one embodiment, the present invention provides an electron beam substrate processing system where a spindle shaft used to rotate substrates during processing includes at least one optical encoder wheel assembly. The optical encoder wheel assembly is configured to provide rotational speed data signal to a rotational speed control system and a pattern generation clock circuit configured to a provide an angular pattern generator clock signal and to a pattern generator circuit. The pattern generation circuit is configured to control modulation of an electron beam used for substrate processing. In one aspect of the present invention, while the spindle shaft is rotated at a constant linear velocity, the pattern generation circuit controls the modulation of an electron beam such that written mark lengths are sized to be about constant in angular dimension.

The invention provides an assessment method of agile imaging simulation and positioning accuracy of a satellite. The assessment method comprises following steps: designing a load physical parameter index according to an application demand; adopting a numerical integration method to simulate the movement trajectory of the satellite in the ideal state and correcting perturbing factors according to a platform design index; calculating an attitude maneuver angle for agile imaging in the mode of constant angular velocity or constant linear velocity and performing correction of a drift angle; generating the ideal agile imaging sequence of images by simulation and corresponding coordinate files for uniform ground grid points based on the movement trajectory of the satellite, attitude data of exposure time, design parameters of a camera, DOM data and DEM data in a corresponding data range; and obtaining an imaging simulation result of synthetic movement of the satellite according to the platform design index and movement error terms so that influence of synthetic movement of the satellite upon geometric positioning accuracy is further assessed. The assessment method of agile imaging simulation and positioning accuracy of the satellite has following beneficial effects: by adoption of the method, a real motion state and an imaging process of the satellite on orbit can be simulated; and geometric positioning accuracy for agile imaging of synthetic movement of the satellite is assessed.

The invention discloses a multi-grinding-unit multi-working-procedure parallel constant linear velocity grinding method. The method comprises the following steps that: 1) a rotary working table drives a workpiece to rotate at the constant angular velocity Omega, wherein the curve of the workpiece is r (theta), and the grinding constant linear velocity is set to be V; and 2) tools in grinding units are driven within the time of dt to operate circumferentially along the workpiece for V1*dt, thus the grinding constant linear speed of each grinding unit is V, wherein V1=V-Omega r(Omega dt), and r(Omega dt) is the distance from a tool grinding part on the curve r (theta) of the workpiece to the center of the workpiece, thus the grinding amount of each working procedure is ensured to be constant, and the grinding quality of each part at the periphery of the workpiece can be ensured to be consistent. The invention also discloses a multi-grinding-unit multi-working-procedure parallel grinding device. The rotary workpiece table surface and a plurality of grinding units are combined to be machined at the same time, the parallel machining of multi-working procedure of the curve of the workpiece is realized, thus the losses of efficiency, re-positioning and the like caused by frequency tool replacement are prevented, and the machining efficiency is improved greatly.

An optical disk recording apparatus operates on an optical disk having circular tracks which are provisionally written with an index signal used for securing a constant linear velocity of the optical disk from an innermost circular track to an outermost circular track, and records data along the circular tracks at different linear densities on different annular zones of the optical disk. In the apparatus, a disk drive section rotates the optical disk while synchronizing the index signal successively read from the rotated optical disk with a predetermined reference clock signal to thereby maintain the constant linear velocity of the circular tracks. A clock generating section multiplies or divides the reference clock signal by different rates to generate different writing clock signals in correspondence to the different annular zones of the optical disk. A data recording section operates in synchronization to the different writing clock signals for recording data along the circular tracks at the different linear densities on the different annular zones.

The invention discloses a move mode shot peening specimen testing method, belongs to the technical field of shot peening processing. According to the method, principles of the feeding mode for each turn, constant linear velocity and the like are introduced, so that a stable shot intensity value linear progressively increasing curve can be obtained; very important significance is provided for determining the shot parameters by technology personnel; the parameter selection success ratio is improved; also because the same linear velocity is used in the part blasting process, the quality of shots is improved greatly. The method comprises the following steps: step one, determining the motion track of a spray gun to be axial motion or radial motion according to the structure of a part, executing the step two if the motion trail is axial motion, and executing the step three if the motion track is radial motion; step two, carrying out the shot peening specimen testing method if the motion track of the spray gun is axial motion; and step three, carrying out the shot peening specimen testing method if the motion track of the spray gun is radial motion.

The invention relates to a constant linear velocity gantry vertical-spindle grinding machine with a round table. The constant linear velocity gantry vertical-spindle grinding machine with the round table comprises a gantry transverse beam (1), a Z-axis servo feed system (2), a grinding head (3), a rotary working table (4), a rotary support (5), a rotary table servo power system (6), a sliding way table (7), ball screws (8), an X-axis servo feed power system (9), a base (10), gantry stand columns (11), an upright sliding way (12), reinforcing ribs (13) and a linear guideway (14). According to the constant linear velocity gantry vertical-spindle grinding machine with the round table, a gantry structure is adopted, the stability of the vertical-spindle grinding machine with the round table is improved, and the abrasive machining range of the grinding machine with the round table is enlarged. Besides, the constant linear velocity gantry vertical-spindle grinding machine with the round table can achieve constant linear velocity grinding, and machining accuracy and ground patterns of the machined surface of a rotary workpiece can maintain consistent.

The present invention discloses an inter-satellite link antenna scanning acquisition device and method. The device comprises: an orbit prediction module configured to predicate antenna parameters; a scanning parameter setting module configured to obtain scanning parameters; a maximum capture time calculation module configured to obtain the required time of scanning the whole determinate region according to the antenna parameters when two satellite antennas are rotated at opposite directions; a timer module configured to limit the scanning time of the two satellite antennas being rotated; a first scanning strategy module configured to perform scanning of the rotation of the two satellite antennas at the opposite directions and determine whether the acquisition is successful or not; and a second scanning strategy module configured to allow the two satellite antennas to return back to the direction of the opposite antenna through orbit prediction at a constant linear velocity and perform scanning in a mode of only one satellite antenna rotation when the two satellite antennas cannot be subjected to successful acquisition in a maximum acquisition time, and determine whether the acquisition can be successful or not. The device can effectively reduce the acquisition time and improve the probability of successful acquisition in a short time.

The invention discloses a constant-pressure constant-linear-velocity polishing method for a robot polishing machine. The polishing method comprises a double-station hemp wheel polishing component, a cloth wheel polishing component, a robot, a robot control system and a PLC control system, wherein the hemp wheel polishing component comprises a connected hemp wheel, a hemp wheel motor and a hemp wheel frequency converter, and the cloth wheel polishing component comprises a cloth wheel, a cloth wheel motor and a cloth wheel frequency converter. The polishing method disclosed by the invention has the advantages that real-time interaction communication of the robot control system and the PLC control system is completed by adding an Ethernet communication function module and a multitask function plug-in module in the robot control system, and constant-pressure and constant-linear-velocity grinding polishing and polishing can be automatically realized; a robot end effector continuously changes attitude, so that each surface of a workpiece can be uniformly polished; the actual grinding and polishing arc lengths of a hemp wheel and a cloth wheel are increased, so that the polishing method disclosed by the invention is applicable to larger-size workpiece processing.

A method for determining an optical write power and an optical disc access system using the same. In addition to a typical Inner Power Calibration Area, the method includes an Outer (second) Power Calibration Area implementation on the outer area of a Readable/Writable Optical disc with a constant linear velocity (CLV) format; when a data writing speed selected by a user causes a rotation speed required by an optical power calibration on an Inner (first) Power Calibration Area of the disc greater than an Optical Power Calibration (OPC) limit, the optical disc access system uses a lower rotation speed for the optical power calibration on the Outer Power Calibration Area to ensure the accuracy of the power calibration.

The invention discloses a paper winding machine with a constant linear speed. The paper winding machine with the constant linear speed comprises a machine frame, a motor, and a winding drum, the bottom of the machine frame is fixedly connected with the motor, the motor is connected with a motor belt pulley through a motor shaft, the motor belt pulley is connected with a winding drum belt pulley through a belt, the winding drum belt pulley is connected with the winding drum through a winding drum shaft, two sides of the machine frame are respectively provided with a guide rail a and a guide rail b, a pressing bar which can be slid along the guide rail a and the guide rail b is installed between the guide rail a and guide rail b, and the bottom of the pressing bar is connected with a roller a and a roller b of the pressing winding drum. The benefic effect of the paper winding machine with the constant linear speed is simple structure, smaller volume, and lower noise generated in the using process, the motor speed is controlled in the working process by the size of the paper roll so as to control the constant linear speed of winding paper, and promote easily.

A disc speed control device for use in a disc player and/or recorder having a pick-up for reading/recording data. The device comprises an inner loop which regulates a determined disc rotation speed value received at its input and an outer loop which delivers this speed value depending on a frequency at which data is read by the pick-up. The present invention is particularly useful in multistandard disc drives which need to adjust to different disc speed modes, for example, constant angular velocity, or constant linear velocity.