31 results about "Rotational error" patented technology

The invention provides a numerical controller for controlling a five-axis machining apparatus. The numerical controller capable of moving a tool end point position to an accurate position in a five-axis machining apparatus. Compensation amounts are set, which correspond to respective ones of a linear axis-dependent translational error, a rotary axis-dependent translational error, a linear axis-dependent rotational error, and a rotary axis-dependent rotational error, which are produced in the five-axis machining apparatus. A translational / rotational compensation amount 3D is determined from these compensation amounts and added to a command linear axis position Pm. As the compensation amounts, there is used a corresponding one of six-dimensional lattice point compensation vectors, which are determined in advance as errors due to the use of a mechanical system and measured at lattice points of lattices into which the entire machine movable region is divided.

A numerical controller capable of moving a tool end point position to an accurate position in a five-axis machining apparatus. Compensation amounts are set, which correspond to respective ones of a linear axis-dependent translational error, a rotary axis-dependent translational error, a linear axis-dependent rotational error, and a rotary axis-dependent rotational error, which are produced in the five-axis machining apparatus. A translational / rotational compensation amount Δ3D is determined from these compensation amounts and added to a command linear axis position Pm. As the compensation amounts, there is used a corresponding one of six-dimensional lattice point compensation vectors, which are determined in advance as errors due to the use of a mechanical system and measured at lattice points of lattices into which the entire machine movable region is divided.

The present invention relates to a method for hard-fine machining of tooth flanks with corrections and / or modifications on a gear-cutting machine, wherein respective toothed wheel pairings which mesh with one another within a transmission or a test device are machined while taking account of the respective mating flanks, and wherein the tooth flanks of the relevant workpieces are provided with periodic waviness corrections or waviness modifications. In accordance with the invention, the rotational error extent is determined by means of rotational distance error measurement of the toothed wheel pairs in a gear measuring device and / or transmission. This measurement result serves as an input value for defining the amplitude, frequency and phase position for the periodic flank waviness corrections on the tooth flanks of the toothed wheel pairings for production in the gear-cutting machine.

A method of applying a registered pattern to a continuous web of material involves determining a position of a next pattern such that the next pattern is in registration with a previous pattern, adjusting the position to maintain a transverse location relative to the web, and adjusting a rotation of the pattern so that the pattern is substantially aligned with a longitudinal axis of the web. Registration features of the web and registration features of the next pattern are used to determine longitudinal, transverse, and rotational errors between the registered position of the next pattern and the path of the web. The registered position of the next pattern is adjusted along a transverse axis of the web according to a transverse error to maintain the transverse location. A rotation of the registered position is adjusted according to an angle that is determined using the transverse error and a distance from a registration feature to a center of the pattern along a longitudinal axis of the pattern.

The present invention relates to an image processing apparatus having an automatic compensation function for an image obtained from a camera, and a method thereof, and provides an image processing apparatus having an automatic compensation function for an image obtained from a camera, the apparatus comprising: an automatic compensation pattern of which one or more can be provided in an arbitrary place near a camera; an input / output module which receives an image as an input from the camera and transmits the same to the image processing apparatus; and an image processing module which is a processing unit containing an algorithm for compensating for distortion of the image obtained from the camera, wherein the input / output module comprises an image input / output unit for transmitting / receiving data in between the camera and the image processing module, and a storage unit for storing information processed by the image processing module, and the image processing module comprises a distortion compensation unit, an image alignment estimation unit, and an image alignment generation unit, the distortion compensation unit extracting, from the received image, characteristic points of the automatic compensation pattern, estimating the absolute location and installation angle of the camera by using the information based on the extracted characteristic points, and performing lens distortion compensation by using an inner parameter stored in the storage unit, the image alignment estimation unit estimating, in the image, the camera installation location and rotational error as a change parameter by using information on the absolute location and installation angle of the camera estimated in the distortion compensation unit, and the image alignment generation unit compensating for the three-dimensional location and size of the image by using the change parameter estimated in the image alignment estimation unit.

The invention provides a control system for a stereo video camera. The control system can obtain stereo images with stereo visual effects even under the condition of unknown relative position relationship between two shooting parts. The control system for the stereo video camera comprises the two shooting parts, an error computing part and a control part, wherein the two shooting parts at least have one controllable digital or analogue degree of freedom for any parameter of Yaw, Pitch, Roll and a zoom rate, and can shoot continuous images by own shooting elements; the error computing part computes a rotating error and a zoom error between the shooting parts by comparing each image shot by the two shooting parts with a preset standard convergence model of each shooting part; and the control part controls the rotating angle and zoom rate of each shooting part by utilizing the rotating error and the zoom error computed by the error computing part.

The invention discloses a method for separating and handling the thermal error, roundness error and turning error of a main shaft of a machine tool. The method comprises the steps of circumferentially uniformly distributing four temperature sensors and four electrical vortex sensors in the radial direction of the main shaft; setting the sampling time of the sensors according to the rotating speed of the main shaft, and acquiring the temperature and radial displacement signals of the main shaft of the machine tool; performing equivalent-cycle truncation for the radial displacement signals of the main shaft, and then carrying out differentiating to obtain the radial thermal displacement error of the main shaft, building a thermal error model through a least-square method, and then separating out the thermal error from the radial displacement error; performing weighted summation for the radial displacement signals of the main shaft, acquired by the four electric vortex sensors, so as to build a function relational expression, and then separating out the roundness error of the main shaft through discrete Fourier transform; subtracting the roundness error and the thermal error from the measured data, so as to separate out the turning error of the main shaft. The method achieves the separating of the radial thermal error, the roundness error and the turning error of the main shaft of the machine tool. Compared with the common three-point error separating method, the method has the advantage that the separating precision is improved.

The invention discloses a device for measuring the dynamic revolution error of a main shaft of a set of revolution equipment. A connecting reference column is mounted between a reference rod and the main shaft, the measuring ends of four displacement sensors are arranged in the circumference of the standard rod and used to detect displacement of the reference rod, the signal output end of each displacement sensor is connected with a data collector, a signal conditioner and a host computer, and the end surface of the connecting reference column and the end surface, connected to the end surface of the connecting reference column, of the reference rod are provided with two symmetrical marks respectively. The invention also discloses a method for measuring the dynamic revolution error of the main shaft of the set of revolution equipment. The method comprises that the main shaft is rotated, and the displacement sensors record numbers; the main shaft is rotated again after the reference rod rotates for 180 degrees, and the displacement sensors record numbers; Fourier transform is carried out on data; and the radial revolution error of the main shaft is calculated according to the data. The error separating technology in the courter-rotating method is improved to measure the dynamic revolution error of the main shaft of the set of equipment, the measuring precision is substantially improved, and the device and method can be widely popularized and applied.

Methods and apparatus for high speed workpiece handling are provided. The method for workpiece handling includes removing a workpiece from a first cassette with a first robot, transferring the workpiece from the first robot directly to a second robot without transferring the workpiece to a transfer station, placing the workpiece on a workpiece holder at a processing station with the second robot, and transferring the workpiece from the workpiece holder to the first cassette with the first robot following processing. End effectors of the first and second robots may each have a plurality of vertical positions for efficient workpiece handling. Displacement error and rotational error of the workpiece may be sensed and corrected without use of a transfer station. The methods and apparatus may be used for handling semiconductor wafers.

The invention belongs to the field of optical measurement, and is a method for measuring the rotation angle of a rotating shaft that can suppress the influence of the inclination angle rotation error of a shaft system. The measurement principle system of the present invention is shown in FIG. 1 , the rotating shaft 2 with the optical wedge 5 is placed between the autocollimator 1 and the reflector 3 . Due to the refraction effect of the optical wedge 5, the beam emitted by the autocollimator 1 is reflected by the reflector 3, forms a deflection angle β with the outgoing beam, returns to the autocollimator 1, and converges into a light point image; when the rotating shaft 2 and the light When the wedge 5 rotates integrally, the reflected light beam rotates around the axis of the rotating shaft 2, and the light spot image in the autocollimator 1 moves along a circular trajectory; the computer 4 records the centroid coordinates of the light spot image on the circumference, and fits the trajectory circle The coordinates of the center of the circle, and then specify the starting point A and the end point B on the circumference, and use the coordinate values ​​of A and B to calculate the corresponding circle center opening angle, which is the rotation angle of the rotation axis 2 to be measured from A to B. In the present invention, the rotation error of the inclination angle of the shaft system hardly affects the measurement accuracy of the rotation angle.

The present invention provides a transfer device which can position with high accuracy, a surface mounting device, a method for producing an error table, programs, and a storing medium. Before electronic components are mounted on a printed board P, an operation control unit 77a adjusts mounting positions, by taking into account chucking positional offset of electronic components which is calculated by an image processor 73, based on the fetched image of a part recognition camera 6, and also, corrects rotational errors around a Z axis of each head based on an error table 74c.

Techniques are provided for controlling the reading of optical data from a master disk in a holographic replication system. Imperfections in the master disk or movement of the disk during a recording process may cause source beams to deviate from target data tracks. In some embodiments, a detector system is used to determine the focus and alignment of the source beams on the master disk, as well as the tilt and rotation of the disk with respect to the holographic replication system. The detector system may detect deviations in the intensity distribution of the reflections of the source beams and generate an error signal corresponding to focusing, tracking, tilt, and / or rotational errors. Servo-mechanical devices may actuate optical components to compensate for such errors.