Abstract: A method of matching a wheel and a tire includes steps of: measuring inner runout and outer runout of a wheel; extracting and setting a primary component of a measurement waveform of the inner runout as an inner runout waveform and extracting and setting a primary component of a measurement waveform of the outer runout as an outer runout waveform; comparing an inner minimum value that is a minimum value of the inner runout waveform and an outer minimum value that is the minimum value of the outer runout waveform with a predetermined runout reference value; and determining an assembly reference position of the wheel based on the inner minimum value or the outer minimum value or based on a resultant waveform of the inner runout waveform and the outer runout waveform, depending on a result of the comparing step.

Abstract: An apparatus that corrects a weight imbalance around an axis of a spindle motor that rotates a disc in a disc drive includes an impact applicator that applies an impact to a housing that houses the spindle motor and the disc, a plate that supports the housing and impact applicator, a spring member that supports the plate, and enables the plate and the housing to vibrate together when the spindle motor rotates, and a detector that detects a vibration of the housing when the spindle motor rotates.

Abstract: An optical disk drive is adapted for reading data from an optical disk. The optical disk drive includes a housing, a tray, and a read module. The tray is disposed in the housing and is adapted for ejecting from the housing. The read module is adapted for reading data from an optical disk. The read module includes a turntable and an optical read head. The turntable includes a number of engaging springs, in which at least one of the engaging springs include added material for superposing the center of the optical disk and the center of the turntable. Furthermore, the optical read head is adapted to move along a tracking path for reading data from the optical disk.

Abstract: A fabrication method of an optical disk drive is provided. The method adapted for alleviating the eccentric issue of a loaded optical disk. The optical disk drive, for example, includes a turntable having a plurality of engaging springs. The engaging springs are adapted to secure the optical disk through a hole in the center of the optical disk. The steps for fabricating the optical disk drive include the following: first, the eccentric degree of the optical disk caused by the engaging springs is measured. Then a result is obtained. According to the obtained result, material is added to at least one of the engaging springs or a part of original material is removed from at least one of the engaging springs.

Abstract: A device for mounting rotors, in particular articulated shafts, in a balancing machine has a bearing frame (10) and a frame upper part (11), which is mounted on the bearing frame so as to be able to oscillate via spring bars and includes a spindle (12) for rotatable mounting of a rotor. The frame upper part (11) is mounted on the bearing frame (10) via groups of spring bars (19, 19?), said groups (19, 19?) being arranged at a distance from the axis of rotation of the spindle (12) and at a distance from one another, and the longitudinal axes of the spring bars forming the spring bar groups (19, 19?) being oriented parallel to the axis of rotation of the spindle (12). The spring bars forming the spring bar groups (19, 19?) have an elongated, slender shape such that their rigidity in an axial direction is at least 100 times, in particular at least 300 times, greater than their radial flexural rigidity.

Abstract: A method for providing a centering check for a rotating body mounted on a wheel balancer which is based on measuring at least one imbalance parameter or tire runout of the rotating body. The rotating body is mounted on a spindle of the wheel balancer and an imbalance parameter or tire runout measurement taken. The mounting of the rotating body on the spindle is then altered, and a second measurement of the imbalance parameter or tire runout is taken. A processor in the wheel balancer utilizes the first and second measurements together with a threshold to provide an indication of off-center mounting of the rotating body one the spindle.

Abstract: A method of balancing a rotor (10), the said method comprising the steps of determining the position of the center of mass of a rotor (10) to be balanced prior to the rotor (10) being machined to its final dimensions, and machining the rotor (10) to its final dimensions by removing material substantially along the length of the rotor (10). The material is removed in the direction of its axis such that the center of mass of the rotor is adjusted to be substantially co-incident with its axis of rotation (22).

Abstract: An apparatus and method for balancing a disk are described. A balance ring may be a circular band for placement along the inner diameter of a disk. On the outer diameter of the balance ring, one or more clamp structures may extend outward to attach the balance ring to the inner diameter of a disk. The inner diameter of the balance ring may have a number of protuberances that, when trimmed, establish a new rotational center of the disk/balance ring coincident with the mass center. The disk and balancing ring may be mounted on a disk balancing system to determine a mass center and trim the protuberances, accordingly, to establish adjust the rotational center of the disk/balance ring to be coincident with the mass center. The protuberances may be trimmed using, for example, laser energy.

Abstract: The drum has a balancer disposed at both ends of a drum body around which a printing plate is wound, and with a rotating shaft rotatably supported by a supporting plate via an elastic support member of a shaft receiving member. When the rotating drum is rotated in a state in which the rotating drum is out of balance, the elastic support member is elastically deformed so that the rotating shaft rotates integrally with the rotating drum. Balance of the drum is restored by eccentric revolution of the balancers, whereby the rotating drum is rotated around a center of the rotating shaft. A recording head is mounted at a bracket that moves integrally with the rotating drum. Thus, the recording head continually opposes a fixed position at the rotating drum, and an appropriate image can be formed on a printing plate.

Abstract: The object of the invention is to provide a balance adjusted wheel and its manufacturing method utilizing a cutting surface, for which cutting is performed by setting a point as a rotation center offset by a given distance from the central axis of a wheel central portion. The invention will improve the work efficiency for wheel balance adjustment and manufacturing of tire/wheel assembly.

Abstract: A wheel balancer includes a method that provides a centering check for a wheel that is based on measuring wheel runout. The wheel is mounted on a spindle of the wheel balancer and runout measurements are taken. The wheel is remounted on the spindle and runout measurements are taken again. The wheel balancer has a processor that checks the differences in the runout measurements according to a predetermined threshold for proper centering. The wheel balancer can compensate for the difference in the runout measurements and can signal the user of the wheel balancer to remount the wheel.

Abstract: Matching multiple wheel rims and tires based upon runout and force variation measurements using balancing equipment. Centering errors and mounting errors are also reduced or eliminated. The method includes adjusting the rotational positions of the tires with respect to the wheel rims to compensate for wheel rim run-out and wheel/tire assembly force variations.

Abstract: Apparatus and method for providing static and dynamic balance in a disc drive having three recording discs. A spindle motor hub includes an outer surface which circumferentially extends about a central axis at an outer radius less than a disc inner radius. A groove is formed in the hub to provide a groove inner surface having a groove radius less than the hub outer radius. The groove radius is selected to be twice the hub outer radius minus the disc inner radius. First and third discs are loaded onto the hub and shifted to bring respective disc inner surfaces into abutment with the hub outer surface at a first angular location. The second, intermediate disc is loaded onto the hub and shifted to bring the disc inner surface into abutment with the groove inner surface at a second angular location opposite the first angular location.

Abstract: The present invention provides a method and apparatus to adjust the rotation balance of a disk with high accuracy and ease during manufacturing. A disk is attached to a spindle to form a disk assembly having an adjustable center of gravity. The disk assembly is rotated and thereby generates vibration. A force, which is a function of the vibration, is applied to one or more components of the disk assembly to reduce vibration of the disk assembly below a predetermined value thereby causing the disk assembly to have a second center of gravity.

Abstract: A method for balancing a rotor of a rotatable machine such as a steam turbine-generator unit. A time-dependent equation is formulated for rotor vibration based on a rotordynamic computer model derived from finite element analysis of the machine's rotor vibration due to centrifugal forces caused by adding unbalance weights. The equation is repeatedly solved in the frequency domain as an optimizer program uses iteration to determine the unbalance weights which will cause the vibration of the rotor of the model to duplicate the measured vibration of the rotor of the machine. Then, balance weights are added to the rotor of the machine which are the inverse of the unbalance weights which were added to the rotor of the model.

Abstract: A frequency tracking adaptive synchronous vibration suppression apparatus for suppressing vibrations in a dynamic system subject to synchronous disturbance includes calculating the sine and cosine quadrature components of the energy representative of the synchronous component of the vibration induced by the synchronous disturbance; combining the sine and cosine quadrature components to obtain the energy representative of the synchronous component of the vibration; generating the Fourier coefficient portions of a correction command from the combination of the sine and cosine quadrature components; computing from the sine and cosine quadrature components and the Fourier coefficients the frequency of the synchronous components of the vibration; and modulating the Fourier coefficient portion of the correction command with the frequency of the synchronous components to obtain the full correction command tuned to the frequency of the synchronous disturbance.

Abstract: An adaptive synchronous vibration suppression apparatus for suppressing vibrations in a dynamic system subject to synchronous disturbance detects the energy representative of the synchronous component of the vibration induced by the synchronous disturbance; generates the Fourier coefficients, amplitude and phase components command; and applies the command to operate an actuator to apply a force to the system to suppress the detected vibration.

Abstract: A computer (21) processes the time between ultrasonic echoes received at a transducer (19) indicative of the outer radius and wall thickness of a workpiece (10) by subtracting (69) the weighted average (80-90) wall thickness from the weighted average outer radius to generate an internal radius for a large number of points around a spiral slice of the workpiece. The internal radii and angles are converted (69) to x and y coordinates. The centroid (X, Y) of each slice of data indicating workpiece cavity internal radii is determined (71) as twice the summation of the x coordinates and twice the summation of the y coordinates of all of the datum points of the slice. The least squares fit (73) of the X coordinates of the centroids of all of the slices and the least squares fit (74) of the Y coordinates of the centroids of all of the slices are then used to determine the average axis of the cavity of the workpiece.

Abstract: A computer (21) processes the time between ultrasonic echoes received at a transducer (19) indicative of the outer radius and wall thickness of a workpiece (10) by subtracting (69) the weighted average (80-90) wall thickness from the weighted average outer radius to generate an internal radius for a large number of points around a spiral slice of the workpiece. The internal radii and angles are converted (69) to x and y coordinates. The centroid (X, Y) of each slice of data indicating workpiece cavity internal radii is determined (71) as twice the summation of the x coordinates and twice the summation of the y coordinates of all of the datum points of the slice. The least squares fit (73) of the X coordinates of the centroids of all of the slices and the least squares fit (74) of the Y coordinates of the centroids of all of the slices are then used to determine the average axis of the cavity of the workpiece.

Abstract: An optical fiber soot synthesis apparatus which synthesizes around a fiber starting member forming a core of an optical fiber an optical fiber soot forming a cladding and which accurately calculates in real time the mass of the optical fiber soot when deposited so as to control the synthesis of the optical fiber soot. The optical fiber soot synthesis apparatus measures the weight of the rotating fiber starting member and optical fiber soot by a pair of soot weight detection sensors arranged at a fiber starting member support and rotational drive mechanisms divided so as to prevent the weight of the rotational drive mechanisms from having much of an effect. The computation and control apparatus performs operational processing from the measured weights and calculates the mass of only the optical fiber soot synthesized on the fiber starting member in real time. The computation and calculation apparatus refers to the calculated mass to control the synthesis of the optical fiber soot.

Abstract: A protective or purge enclosure provides a positive atmosphere around an operating device such as a hand-held computer or calculator contained therein. The protective enclosure has sufficient flexibility, even though providing a positive, sealed atmosphere, to enable the user to operate the functional features of the device sealed within the enclosure, and the material forming the device is sufficiently transparent to enable the user to view the functional features of the device for operation. A visible indicator provided on the enclosure enables the user to determine if the enclosure is maintaining the positive atmosphere sealed therein.

Abstract: In a method and apparatus for mass centering of a rotor, the unbalance of the rotor is measured and the result of the unbalance measuring operation and the weight of the rotor are used to determine the position of the axis of inertia which extends through the center of mass of the rotor, with respect to the axis of rotation thereof. The position of the axis of inertia is marked on an end face of the rotor by a marking tool. For that purpose, to bring the position of the axis of inertia and the marking tool into the appropriate relationship, relative displacement is produced by an actuating means as between the rotor and the marking tool in the radial direction with respect to the axis of rotation of the rotor, with the rotor or the marking tool being guided in the direction of displacement by a guide means disposed at an angle with respect to the axis of rotation of the rotor.

Abstract: The position and magnitude of an unbalance correction in specified correction planes is determined for the purpose of reducing a determined unbalance in a body. Such correction planes may comprise the inner and outer surfaces of a wheel. Incremental correction is provided with respect to magnitude and continuous correction is provided with respect to the position in order to achieve minimalization of the residual static unbalance with only one correction weight per correction plane. The existing unbalance in the correction planes according to magnitude and position is determined, and the influence of various corrections upon the static and the dynamic residual unbalance that can be accomplished with one correction weight per correction plane are also determined. Corrections are provided in the correction planes for balancing that produce the minimally possible static residual unbalance and which fall within predetermined limits in each correction plane.

Abstract: A machine for mass-centering rotors consists of a pair of spaced apart headstocks, each rotatably supporting an adapter disc, and each equipped with a device for the application of machining centers in a rotor being investigated. Adjuster mechanisms on the adapter discs are removably secured to the ends of the rotor, whereby rotation of the discs causes the rotor to rotate. The headstocks are connected to a vibration sensing vibratory bridge arrangement which picks-up the vibration of the rotor as it rotates. The adjuster mechanisms shift the axis of rotation of the rotor until the unbalance thereof is zero or at a predeterminable level. Rotors of differing length are easily positioned between the headstocks which move toward and away from one another.

Abstract: A mass centering method and apparatus for ascertaining and marking the location of the axis of inertia of rough or premachined rotating article, allowing the marked axis to be used as a centerline in further processing in order to keep the remaining unbalance in the finished article as low as possible. The location of the axis of inertia is determined by an ordinary balancing method, and is then positioned relative to a center marking point, such as the centerline of a center drill, by only two revolving movements: one being a rotation of the article about its own axis of rotation, and the other being an eccentric rotation of the article about the axis of a supporting fixture. An appropriate combination of angle settings for both revolving movements allows the system to locate a theoretically unlimited number of marking points within a circular range of a predetermined diameter.

Abstract: The dynamic axis of a sphere, e.g. golf ball, is located by spinning the sphere at high speed while it is supported on a low friction-bearing surface, thus allowing the desired stable axis to align itself with the spin axis. Markings indicative of the location of the stable axis are applied to the sphere. The spinning operation also indicates the degree of existing eccentricities in the sphere.

Abstract: Dynamic unbalance of a rigid rotor is corrected by machining the rotor in a direction parallel to the rotor axis of said rotor by subtracting or adding weights corresponding to a corrective weight in two planes for compensating initial unbalanced vectors corresponding to correction angle directions and corrective weights in the planes. Prior to effecting the machining, center of gravity position of a corrective machining weight is calculated for effecting corrective machining in the axial direction; the corrective machining corresponds to the corrective weight. The initial unbalanced vectors in the two planes are corrected into unbalanced vectors in new planes respectively including the centers of gravities of the corrective machining weights determined during the calculating step. Correction angular positions and corrective machining weights around the respective planes are obtained by repeating the calculating and correcting steps.

Abstract: A switch is provided for ending the shifting movement of a crankshaft when the balance thereof is being adjusted in a machine for balance centering. The machine for balance centering is provided with a bearing bed below a swing bridge supported by means of springs, in which machine the crankshaft to be balance centered rotates around the axis of the machine. The axis of the crankshaft can be displaced in relation to the axis of the machine until a minimal rotation radius has been obtained for a point on the surface of two selected crankshaft sections rotating around the axis of the machine without eccentricities due to the system.

Abstract: The invention relates to a process and apparatus for the centering of rotational bodies having uneven mass distribution along the shaft axis, particularly crankshafts, in a dynamic centering machine, whereby a working axis is obtained by shifting both ends of the rotational body as opposed to the axis of rotation of the dynamic centering machine.

Abstract: A balancing device and method for balancing a rotating body during operation. The device and method detects the phase and amount of unbalance and provides signals in synchronism with the unbalance. Local heating of the rotating body is provided to counteract the unbalance by thermal deformation of the axis of the body without removing material. The phase and amount of the local heating are controlled in relation to unbalance detected.