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| Number | Title | Issue Date |
| 6872065 | Vane gas compressor having two discharge passages with the same length A gas compressor has a cylinder chamber provided with discharge holes. Openings are in communication with the discharge holes, respectively. Discharge passages having the same length are connected with the openings, respectively. The ends of the discharge passages a... | 03/29/2005 |
| 6598288 | Armature of motor, manufacturing method of the same and motor using the same and motor having the same A motor armature which allows assembly works to be facilitated and which can be miniaturized and thinned is provided. An inner cylinder 1 and an outer cylinder 2 are disposed coaxially and a plurality of pole pieces 3 are provided radially at equal interv... | 07/29/2003 |
| 6253120 | Position and/or force controlling apparatus using sliding mode decoupling control An interacting term existing in a control system is decoupled on the basis of a regular condition of a decoupling matrix. Then, an hyperplane ς which has been obtained to satisfy the Lyapunov stability condition is designed. A control quantity is converg... | 06/26/2001 |
| 6229231 | Reciprocating motor having controllable rotor position To provide a reciprocation motor capable to detect rotation angle of rotor accurately. Rotor 1 is a magnet having two poles to radial direction and comprises half-cylindrical magnets. Driving coils 5a and 5b are bound equally at coil board 3. Magnetic sen... | 05/08/2001 |
| 6208051 | Spindle apparatus A spindle apparatus comprises a rotary body and at least a pair of magnetic bearings for levitating the rotary body by magnetic forces. A combined motor and magnetic bearing device is disposed between the magnetic bearings for imparting a rotational torqu... | 03/27/2001 |
| 6204776 | Communication abnormality detecting/coping device and vacuum pump remote monitor control device A communication abnormality detecting/coping device and a vacuum pump remote monitor control device are provided, which are capable of detecting the presence/absence of an abnormality in data communication and reducing an influence of the abnormality on a... | 03/20/2001 |
| 6163952 | Method of manufacturing armature of motor using hoop member A motor armature having a simplified assembly comprises an inner cylinder and an outer cylinder arranged coaxially, and a plurality of pole pieces provided radially at equal intervals between the inner and outer cylinders. The inner cylinder is formed int... | 12/26/2000 |
| 6158225 | Automotive air-conditioning apparatus To keep a temperature of an interior of an automotive vehicle at least at a level of an external atmospheric temperature even if the vehicle is parked with an engine being stopped for a long time, an automotive air-conditioning apparatus is composed of a ... | 12/12/2000 |
| 6125635 | Temperature adjusting device A temperature adjusting device has an air-tight container. A thermoelectric element is disposed in the air-tight container and has first and second opposite surfaces each capable of radiating and absorbing heat through a Peltier effect. A first heat excha... | 10/03/2000 |
| 6048104 | Ferrule for use in optical fiber connector A ferrule for use in an optical fiber connector comprises a main body having an insertion hole for receiving an optical fiber element. The insertion hole has a first end for receiving the optical fiber element, a second end, a positioning portion disposed... | 04/11/2000 |
| 6036368 | Dynamic pressure bearing device A dynamic pressure bearing device comprises a rotary member mounted for rotation, and a dynamic pressure bearing rotatably supporting the rotary member. The dynamic pressure bearing has a stationary portion and a disk integrally connected to the stationar... | 03/14/2000 |
| 6023115 | Magnetic bearing apparatus with radial position correcting electromagnet To prevent the problem of dragging on an auxiliary bearing which tends to occur in a motor in the vicinity of a resonance point of rigid mode during the start-up of a three axis control magnetic bearing apparatus, a radial position correcting electromagne... | 02/08/2000 |
| 5988075 | Swiveling table device A swiveling table apparatus comprises a base and a table main body disposed on the base and mounted for swiveling movement about a swivel axis. A driving mechanism includes a servo motor for generating a driving power to swivel the table main body about t... | 11/23/1999 |
| 5984501 | Super-precision positioning system A positioning system comprises a feeding mechanism having three or more feeding units disposed in a moving direction of a moving body. Each of the feeding units has first and second moving elements for clamping and unclamping the moving body, feeding the ... | 11/16/1999 |
| 5980192 | Table feeder A table feeder apparatus comprises a base, a feed screw rotatably supported on the base and a motor for rotating the feed screw about a feed axis. A feed nut is mounted on the feed screw and a block is mounted integrally with the feed nut. A table is disp... | 11/09/1999 |
| 5973468 | Magnetic bearing devices To provide magnetic bearing devices capable of preventing undesirable consequences caused by conical mode or parallel mode resonance which is liable to occur during acceleration of a rotor. A band-pass filter 24 is connected in series with a PID control c... | 10/26/1999 |
| 5971836 | Grinding machine A grinding machine comprises a grinding member having a thickness greater than 10 mm and an outer contact surface extending in a thickness direction of the grinding member for contacting a surface of a workpiece. The grinding member is supported by a firs... | 10/26/1999 |
| 5963711 | Watch outer case polishing apparatus and general purpose polishing apparatus A polishing apparatus comprises a polishing member for polishing a workpiece and a manipulator for manipulating the workpiece and having a base disposed at a coordinate origin of a base coordinate system. The polishing member and workpiece define therebet... | 10/05/1999 |
| 5957752 | Grinding wheel dressing method and device As illustrated, a formed grinding wheel dresser 4 is moved toward a formed grinding wheel 2 and is caused to make approach to it up to a prescribed position in the infeed direction thereof. After the formed grinding wheel dresser 4 has approached the pres... | 09/28/1999 |
| 5954482 | Compressor having pressure eliminating means A gas compressor has a first chamber for receiving a low pressure refrigerant gas. A main body has a second chamber for drawing in the low pressure refrigerant gas from the first chamber and undergoing a compression operation to compress the low pressure ... | 09/21/1999 |
| 5923559 | Magnetic bearing apparatus A magnetic bearing apparatus comprises a first magnetic bearing for levitating a rotary body by magnetic attraction forces in an axial direction thereof and a second magnetic bearing for levitating the rotary body by magnetic attraction forces in a radial... | 07/13/1999 |
| 5911420 | Chuck spindle apparatus A chuck spindle apparatus comprises a chuck spindle mounted for rotation about a central rotational axis, a chuck main body integrally connected to a forward end of the chuck spindle for rotation therewith, and an indexing device. The chuck main body has ... | 06/15/1999 |
| 5909530 | Method for manufacturing ferrule for use with optical fiber connector A method for manufacturing a ferrule for use with an optical fiber connector comprises providing a ferrule blank having a hole for insertion of an optical fiber therethrough between end surfaces of the ferrule blank. A rough grinding operation is performe... | 06/01/1999 |
| 5821647 | Spindle motor A spindle motor comprises a rotational member supported by bearings for rotation about a rotational axis, a rotational body and a motor rotor mounted on the rotational member for rotation therewith, and a motor stator mounted around the motor rotor. The r... | 10/13/1998 |
| 5820104 | Vertical transfer system for a vacuum chamber and gate valve assembly A vacuum-oriented vertical transfer system which provides super vacuum/super clean environments, and a gate valve assembly which reduces the size of electromagnet sections. The vacuum-oriented vertical transfer system includes a cylindrical partition wall... | 10/13/1998 |
| 5804896 | High speed spindle motor and apparatus equipped with high speed spindle motor A spindle motor comprises a permanent magnet having an outer diameter, an outer circumference, and a number of poles. A stator core is disposed around and spaced from the outer circumference of the permanent magnet rotor. The stator core has a yoke portio... | 09/08/1998 |
| 5788432 | Method and apparatus for computing allowable spindle rotation speed A spindle apparatus comprises a main shaft mounted for rotary movement, a rotating device for rotating the main shaft about an axis, a vibration device for vibrating the main shaft, a detecting device for detecting a displacement of the main shaft when th... | 08/04/1998 |
| 5760510 | Magnetic bearing device A magnetic bearing device comprises a rotor, electromagnets, radial direction displacement sensors, and a control circuit for controlling an exciting current of the electromagnets in accordance with a signal from the radial direction displacement sensors ... | 06/02/1998 |
| 5722816 | Gas compressor The compressor has a cylinder chamber, a control plate provided with an inlet hole, a gas exchange chamber, and gas supply passages. The cylinder chamber is in communication with the gas exchange chamber via the inlet hole in the control plate. The gas ex... | 03/03/1998 |
| 5713244 | Robot An orthogonal coordinate type robot comprises a slider and a support frame supporting the slider for movement within a predetermined range along an axis. The support frame has an inner wall surface, at least one hollow portion, and a connecting hole for c... | 02/03/1998 |
| 5710825 | Cutting line measuring apparatus An apparatus for measuring a cutting line having a first end and a second end comprises a photographic device for photographing an image signal of the cutting line, and a processing device having a conversion function for converting the image signal of th... | 01/20/1998 |
| 5667646 | Dressing apparatus A dressing apparatus comprises at least two electrode pieces each having an arcuate inner surface and being arranged around a grinding stone to define a gap therebetween. A gap adjusting mechanism adjusts the gap between the arcuate inner surface of each ... | 09/16/1997 |
| 5666013 | Magnetic bearing By using a hysteresis amplifier for driving an electromagnet, a highly accurate electromagnetic bearing may be produced without the need for independent position detectors to maintain the levitated position of a rotor constant. In one embodiment, the elec... | 09/09/1997 |
| 5639206 | Transferring device A transferring device is provided for transferring an article between vacuum chambers. The transferring device comprises a cylindrical float member, and a transferring rod connected to and extending along an axial direction for supporting an article. At l... | 06/17/1997 |
| 5628673 | Dicing machine with non-contact setup function A dicing machine comprises a work table having a surface for supporting a workpiece and a processing element for processing the workpiece. A gap detection device detects a preselected gap between the processing element and the surface of the work table. A... | 05/13/1997 |
| 5586468 | Table driving device It is intended to provide a table driving device which does not make a machine unduly large, and moves a table with high accuracy without being affected by deflection components of a nut as caused by rotation of a feed screw. The table driving device incl... | 12/24/1996 |
| 5585718 | Device for detecting the bending magnitude of a shaft A device for detecting a bending magnitude of a rotary shaft comprises a first pair of coils spaced from and facing the outer surface of a shaft and having an inductance value, and a second pair of coils spaced from and facing the outer surface of the sha... | 12/17/1996 |
| 5498198 | Grinding machine A grinding machine comprises a table movably disposed on a fixed base to undergo reciprocal movement relative to the fixed base along a reciprocating axis. A first shaft is rotatably disposed on the table to undergo rotation relative to the table about a ... | 03/12/1996 |
| 5485910 | Conveyor A conveyor is of a low power consumption type and has a decreased amount of gas generation. The conveyor is provided with a floating member having a conveying rod on which a workpiece is laid; a conveying body magnetically coupled with the floating member... | 01/23/1996 |
| 5462470 | Grinding wheel spindle assembly A grinding wheel spindle assembly comprises a first casing and a second casing spaced apart from and facing the first casing. A shaft has one end fixed to the first casing and another opposite end fixed to the second casing. A hollow, cylindrical-shaped r... | 10/31/1995 |
