Abstract: A balancing apparatus for balancing a high precision magnetic disk drive includes a plate having a circular aperture in which three mounting surfaces grip a precision mounting ring on the disk pack to be balanced. The plate is mounted on a pivoting platform so that the pack can be lowered into the aperture, gripped by the mounting surfaces and then flipped into a horizontal position for balancing such that an operator has access to the disk pack to add balancing weights through the circular aperture.

Abstract: An apparatus for fitting proper sizes of balance weights to the inner and outer rims of a wheel at proper positions. The apparatus includes a wheel balance measuring station and a balance weight fitting station arranged side by side. In the balance weight measuring station, the wheel is measured to detect unbalance of the wheel so as to determine sizes of balance weights to be fitted to the rims and positions at which the balance weights are fitted. According to the determination, weight size signals and position signals are provided and sent to the balance weight fitting station.

Abstract: The invention pertains to a method of continuous compensation of unbalance present in a rotor, in particular, a grinding wheel. This is done by feeding a compensation fluid into correction chambers which are rotated with and arranged on the rotor at various angular locations. The supply of fluid is effected in successive balancing operations during rotation of the rotor and as a function of the minimum and maximum unbalance signals measured by a transducer over a certain period of time. The tolerance is determined for acceptable unbalance values. The balancing operation is terminated on the basis of the minimum and maximum which is multiplied by a multiplier determined as a function of allowable variations of the measured unbalance signal.

Abstract: A method of and apparatus for balancing a rotary body is disclosed. The apparatus includes an unbalance detection unit which rotates the body in first and second spaced bearings, the location of the first and second bearings defining first and second bearing planes, respectively. The forces developed by rotation of the body are sensed at the first and second bearing planes and the forces about the first bearing plane are summed to determine the weight and angular location of a mass compensation which, if effected, would substantially statically balance the body. An iterative technique is utilized which determines the axial location of the mass to be removed or added which would reduce to a minimum the dynamic unbalance of the body. The body is then passed to an unbalance correction unit which removes or adds the mass at the determined angular and axial locations to minimize the static and dynamic unbalances.

Abstract: A disc is firmly clamped to the end of a rotatable spindle by a coaxial clamping plate spaced from the spindle end by a ring between the plate and disc surface and attached to the spindle by a single coaxial bolt. The flexible plate, thicker at its center than near its periphery, has a substantially flat inner surface which, when stressed by tightening of the bolt, is deformed without exceeding its yield stress to the point where its center section contacts the spindle end surface to provide a constant predetermined clamping force evenly around the disc.The disc and spindle assembly is rapidly and accurately balanced without loosening the clamped disc from the spindle with an adjustable balancing bar which is attached to the head of the coaxial bolt and which may be properly adjusted by the use of a conventional balancing system which can indicate magnitude and direction of the imbalance.

Abstract: Delivery apparatus for carrying a plurality of balance weights for automobile wheels and delivering a suitable weight to an insertion device to fit the weight on the rim of a wheel in a predetermined circumferential position. The balance weights have parallel through bores and the insertion device includes a pair of spaced mandrels receivable in the through bores of the weights to carry the weights from a storage compartment to an automobile wheel and install the weight on the rim at the predetermined position. The apparatus includes a clip applying apparatus to force a retaining clip over the balance weight and the wheel rim to secure the weight to the rim.

Abstract: The saw assembly is provided with a self-contained balancing means for the automatic balancing of the wheel head. In one embodiment, the balancing means includes an annular rotor which is mounted on the wheel head and which contains a vaporizable fluid medium within circumferentially spaced chambers. Heating elements are provided for heating selected chambers in order to vaporize and transfer the balancing medium between chambers via a capillary manifold tube, or pneumatic means is used to transfer the balancing medium. Sensors are provided to sense the rotation of the wheel head and the radial vibration of the wheel head and cutting blade of the saw assembly in order to determine where the wheel head is out-of-balance.

Abstract: A device for applying imbalance to a rotor comprises a plurality of chambers disposed symmetrically around the rotor. Each has an opening and is adapted to contain a fluid. Each of a plurality of opening devices associated with the chambers is operable under remote control so as to open the opening of the associated chamber, so that the fluid contained in it may be evacuated from it. Each opening device comprises a pyrotechnic valve incorporating a piston rigidly attached to an assembly and movable from a first position in which the assembly closes the opening of the associated chamber to a second position in which the assembly opens the opening. Such movement is obtained in response to firing of the pyrotechnic valve. The opening device also includes a control circuit which incorporates a receiver responsive to a signal transmitted from a fixed source with no material transmission medium. This control circuit fires the pyrotechnic valve.

Abstract: A dynamic balancing machine having a full-automatic reforming unit is disclosed. The machine includes a pair of oscillatory bearing units for resiliently supporting a workpiece rotatably about a horizontal axis. Pickups are provided to sense the oscillations of the rotating workpiece about the axis. A computing unit responds to oscillation signals to determine therefrom and from signals representing the rotation of the workpiece the amounts and positions of local unbalance of the workpiece. For reforming operation, a fluid-actuated piston/cylinder arrangement is used to fix the axis of rotation of the workpiece in alignment with the horizontal axis to enable the workpiece to rotate without oscillations.

Abstract: A method and a device for balancing circular plate-shaped objects, in which the object is centered on means which are movable against spring force. The object is then clamped against a rotatable part which is rotated at a given speed. The object is then released, whereupon it undergoes a deviation from the axis of rotation which is proportional to the unbalance. Subsequently, the object is clamped again and the outer edge is turned to remove the unbalance.

Abstract: A counterbalance device for a rotary shaft comprises a sleeve member in the form of a short tubing or a handle which can be mounted on the rotary shaft. The sleeve member has an extension rear portion adapted to receive a bushing member to be mounted thereon. The bushing member is provided with at least two aligned openings. A rod can be inserted through these openings and be mounted on the bushing member by a set screw. At least one counterbalance weight can then be mounted on the rod to provide counterbalance for uneven weight distribution with respect to the longitudinal axis of the rotary shaft.

Abstract: Compensation is provided for dynamic unbalance imparted to a fixed body by a rotating body that is connected to the fixed body by a shaft about which the rotating body rotates. Force components exerted on the fixed body by the rotating body in a plane at right angles to the axis are determined. In response to the determined force components, the rotational speed and effective direction of mass means mounted on the rotating body are controlled. The mass means has an effective axis of rotation in a plane at right angles to the longitudinal axis.

Abstract: An improved unbalance compensator control in which the distribution of balance mass fluid is controlled by selective activation of thermal devices creating thermal differentials and ensuing balance mass fluid re-distribution for balance correction, and in which electrical power for the thermal devices is transmitted across an air gap separating stationary and rotating portions by means of the selective energizing of primary coils each of which has a corresponding confronting secondary coil associated therewith. Different geometries of coils are disclosed. In another embodiment a composite waveform containing power and signal components is conducted to the rotating portion by electro-mechanical contact arrangements at opposite axial ends of the machine on which the unbalance compensator is mounted.

Abstract: The mass center of a field flow fractionation channel is adjusted to coincide with the geometric center of the channel. Under these conditions, above critical rotor speeds, the mass center will coincide with the geometric center of the channel and both will coincide with the spin axis of the rotor. This ensures that all portions of the field flow fractionation channel are subjected to about the same centrifugal force.

Abstract: An apparatus for balancing bodies of revolution, according to the invention, includes distributing units mounted coaxially with a body of revolution in the measurement planes on both sides of the plane passing through the center of mass of the body of revolution perpendicular to the geometric axis thereof. The apparatus also comprises balancing tanks hydraulically connected with a liquid supply source and the distributing units and installed peripherally within the body of revolution in the correction planes on both sides of the plane passing through the center of mass of the body of revolution perpendicular to the geometric axis thereof. Each of the distributing units contains a chamber with conduits, hydraulically connected with the liquid supply source. The ends of the conduits are disposed inside said chamber and are equidistant from the geometric axis thereof.

Abstract: A device for balancing rotating bodies including a sensing arrangement for sensing the out of balance of the rotating body and for abrasion tool at a frequency corresponding to the speed of the rotating member so as to remove material from the rotating member in phase with the working vibration in the same region of the rotating member for effecting a balancing of the rotating member. The apparatus also includes an adjusting arrangement enabling adjustment of the phase relationship of the vibration of the abrasion tool with respect to the phase relationship of the out-of-balance signal so as to effect shifting by any number of steps of 360.degree./n, n being a whole number>3, irrespective of the speed of the rotating member.

Abstract: The invention relates to an inertial method and device enabling the centering of a circular rim on its hub to be ensured and giving a practical solution to the problem of the static and dynamic balancing of rotors. The device comprises a rim, a hub, at least one linking arm with two branches passing around the hub. Masses localized at the ends of the arms ensure, in the course of rotation, the holding fast, by pressure, of the arm to the rim, on the one hand, and by traction on the branches on the other hand, of the arm to the hub. Anisotropic masses distributed between the arms keep the circularity of the rim constant. Electro-mechanical means ensure the static and dynamic balancing of the arm-rim-hub assembly. The invention may be used for the rotors of kinetic energy storage system.

Abstract: In some helicopters power is transmitted from a gearbox adjacent the engine to the tail rotor by a long shaft. To minimize weight, a tubular shaft is used, which rotates at supercritical speeds. Vibrations resulting from shaft unbalance are magnified by resonance as the shaft passes through its critical speeds making it essential that the shaft be finely balanced. This is accomplished by slowly rotating the shaft about its axis while measuring at a chosen station along its length both the wall thickness of the tubular shaft and the distance from a fixed reference plane to the outer surface of the shaft. From these data are determined the local cross sectional area and the location of the center of gravity at the chosen station. From the latter two quantities are determined both the amount of counterweight required and its required angular location around the shaft, for the chosen station. The measurements are repeated at a large number of stations along the shaft.

Abstract: A system for balancing a rotary element involving two or more materials of different melting temperatures normally fixed in position relative to the rotary element. Heating of the materials first to a point above the highest melting temperature followed by cooling at optimum balance then reheating to a point above the next highest melting point followed by cooling at optimum balance and repeating the procedure for each material results in vernier balancing action, the masses of the various materials being selected to predetermine their effect on balance.

Abstract: An upright post has a rounded bearing member at its upper end provided with a discharge port through which air, supplied at the lower end of the post, exits. A cylindrical bearing body is formed with a vertical bore extending therethrough so as to accommodate therein a longitudinal portion of the upright post, the bore being slightly larger in diameter than the post. The bearing body supports upper and lower balancing mechanisms, each including a plate or platform having four quadrantly located sensing ports. A bearing cap overlying the rounded bearing member is affixed to the platform of the upper balancing mechanism. The platform of the upper balancing mechanism removably rests on the top of the bearing body and has mounted thereon a pair of reversible air motors, each having a shaft and shiftable weight threadedly disposed on the shaft.

Abstract: A spin-stabilized body having deployable solar panels or appendages is modified by making the deployment mechanism capable of partial retraction and extension from the normal deployed position on an individually commandable bais. The spin axis of a free spinning body is dependent upon the location of the center of gravity within the body rather than by external bearing or support points as with a restrained spinning body. However, mispositioning of the center of gravity of the spacecraft may cause misalignment of the spin axis with respect to the geometric axis, thereby causing dynamic imbalance which is observed as body wobble. Such wobble can be minimized by offsetting the center of gravity of the panels or appendages from the center of gravity of the spacecraft in the axial direction and making the deployment mechanism for the panels or appendages capable of partial retraction and extension in the radial direction on an individually commandable basis.

Abstract: Disclosed is a technique and apparatus for dynamically balancing rotating members without the necessity of dismantling the same. A horizontally mounted fan is disclosed having passageways in the shaft thereof leading to receptacles within the fan blades themselves wherein weights may be deposited by means of the centrifugal force of the rotating fan. Further means are presented wherein access may be made to weight receptacles of a sealed fan system by means of a weight depositing probe which is operative to make engagement with the various weight receptacles. Yet another embodiment utilizes tubular passageways mounted externally to the rotational shaft of a horizontal system to make engagement with weight receptacles positioned about the rotating system. Also disclosed is a unique slide rule particularly adapted to appropriately divide a requisite balancing weight into components for the various weight receiving receptacles available.

Abstract: A rotor balancing apparatus comprises a chamber for balancing material, the chamber having a nozzle and being arranged in the field produced by an electromagnetic inductor coupled to a pulse generaor which, in turn, is electrically connected to the output of a control unit. The input of the control unit is connected to a transducer of vibration parameters of the rotor being balanced, as the latter rotates in front of the nozzle of the chamber. As electric pulses are applied to the inductor from the generator, magnetic pulse forces are generated in the chamber, whereby doses of the balancing material are ejected through the chamber's nozzle onto the surface of the rotor being balanced, which takes place at the moment when the "light" point area of the rotor is in front of said nozzle.