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| Number | Title | Issue Date |
| 8164223 | Linear motor mounting structure The present invention provides a magnetic attractive force-offsetting linear motor which prevents motor thrust from varying due to changes in the position on a stator, thus enabling improvement of the motor thrust and of the accuracy of the machine tool and the qual... | 04/24/2012 |
| 8156850 | Tailstock control device A tailstock control device supports an object to be machined by driving and controlling a servo motor which drives a driving system of a tailstock having a spring member in forward and backward directions, to cause a tailstock center connected to the tailstock to co... | 04/17/2012 |
| 8126585 | Collision preventing device incorporated in numerical control apparatus A collision preventing device includes an acceleration/deceleration simulating unit 30 that performs acceleration/deceleration processing based on a moving command generated by a function generation unit 16 according to a method similar to that used by... | 02/28/2012 |
| 8082048 | Position controlling device A structure is provided in which a thrust feed forward structure for operating a structure to be driven without vibration and a control structure which simultaneously compensates for positional deviation caused by the thrust feed forward structure and positional dev... | 12/20/2011 |
| 8065916 | Bearing state diagnostic apparatus Provided is a bearing state diagnostic apparatus in which a sound generated from a bearing is detected by a sound sensor, a detected value of the sound sensor is compared with data which was previously formed, thereby diagnosing a state of the bearing, wherein at le... | 11/29/2011 |
| 8019460 | Numerical controller of machine tool A numerical controller having a function-generating unit which executes function generation for shaft movement according to a machining program is provided, the numerical controller further comprising a unit which stores shape data of the movable unit and shape data... | 09/13/2011 |
| 7982425 | Position control apparatus A position control apparatus includes a reverse displacement calculation unit configured to calculate a reverse displacement that represents an amount of movement made from a preceding reverse point to a current reverse point by an axis that performs a reversing mot... | 07/19/2011 |
| 7944095 | Linear motor with integrally formed stator A linear motor assembly includes two stators extending in parallel and having salient poles arranged at a predetermined interval on opposing surfaces and a mover having three types of mover blocks. The mover blocks are made up of three-phase alternating current coil... | 05/17/2011 |
| 7839029 | Linear motor In a linear motor, the stators and sliders are arranged to fill a predetermined relationship. In one configuration, two stators each include a plurality of stator blocks arranged in a moving direction of sliders so that projecting poles are maintained at predetermin... | 11/23/2010 |
| 7805285 | Machining simulation system A numerical control apparatus can perform a machining simulation or an interference check that reflects worksite information. However, a machining simulation apparatus cannot use worksite information in a machining simulation or an interference check. Thus, simulati... | 09/28/2010 |
| 7792603 | Program and method for generating approximate curve from approximate point group data An approximate curve generation method according to the present invention generates an approximate curve as smooth as an original curve from point group data obtained by approximating a curve shape, and includes: an approximate polygon shape range determining step o... | 09/07/2010 |
| 7711508 | Position detector Two position sensors provide, as outputs, two signals that vary sinusoidally at a pitch of wavelength λ with respect to a displacement of a target and have phases shifted from each other by 90°. A memory unit has stored therein offset values for the two signals, a... | 05/04/2010 |
| 7689300 | Numerical control unit When causing manual movement of a moving section of a machine tool, shape data of the moving section is made to move in a movement direction that has been input manually, and it is confirmed whether there is no interference with shape data of a surrounding interferi... | 03/30/2010 |
| 7673298 | Software object verification method for real time system Before applying a software object such as virus detecting software to a customer's real time control apparatus, in order to verify an effect on real time control of the software object, the software object is downloaded from a first web site to a verifying real time... | 03/02/2010 |
| 7612513 | Control device equipped with motor protection function A synchronous motor control device having an optimal protection function in accordance with an operational state of a motor is provided. The motor control device includes a position detecting sensor detecting an angular position of a motor, a speed controller... | 11/03/2009 |
| 7571669 | Machining apparatus for noncircular shapes In a noncircular shape machining apparatus, a tool 7 is moved reciprocally in an X-axis direction by a tool-moving mechanism. A first acceleration sensor 6 is disposed on a saddle 11, which is an immovable section of the tool-moving mechanism. F... | 08/11/2009 |
| 7561927 | Numerical controller which can call program described in script language A program interpreter which interprets and executes a numerical control program can recognize predetermined mnemonics (script mnemonics) prepared for instructions for setting, loading, and executing script programs. When the program interpreter recognizes the script... | 07/14/2009 |
| 7352294 | Absolute position detector An absolute position detector for accurately reading a code recorded on an absolute track is provided. Output signals from sensors that read a code recorded on an absolute track are input into a binarization processor. A compensator provided within the binarization ... | 04/01/2008 |
| 7254770 | Sensor apparatus and monitoring method of control system using detected data from sensor apparatus A counter within a rotary encoder outputs 8-bit count data CT for counting up at a period equal to or faster than the transmission period of positional data. When the rotary encoder receives a communication frame for positional data request command STX at a receivin... | 08/07/2007 |
| 7167772 | Machining time calculating apparatus A structure having a parameter storing unit which stores a parameter to be used when a numeric control apparatus drives and controls the numeric control machine tool, a program interpretation unit which reads a part program to generate machining data for each block,... | 01/23/2007 |
| 7154198 | Linear motor In a linear motor having permanent magnets placed on a slider, the slider has slider blocks disposed in such a manner that relative positions between front ends of the slider blocks in a slider moving direction and salient poles of two stators opposing the slider bl... | 12/26/2006 |
| 7151336 | Rotor of reluctance motor A plurality of projections are provided abutted with an outer circumference of a columnar axis inserted to an inner circumference of a rotor. The projections are provided in the direction of a magnetic pole in the rotor. When the rotor is fixed to the columnar axis,... | 12/19/2006 |
| 7062352 | Method for displaying tool locus in NC data and method for analyzing NC data With respect to two or more NC data points among a group of dots together representing a tool locus, a curvature radius of the tool locus is determined. Then, the NC data point and its succession with other points is displayed in a display color determined according... | 06/13/2006 |
| 7049924 | Electromagnetic induction type position sensor An electromagnetic induction type position sensor comprises an AC magnetic flux generating device which generates AC magnetic flux substantially at a wavelength λ, and a plurality of coils which receives the AC magnetic flux to output electromagnetic induction volt... | 05/23/2006 |
| 7026779 | Motor control apparatus for controlling operation of mover of motor A motor control apparatus of the present invention comprises a velocity detector for detecting a rotation velocity of a mover of a motor, a position detector for detecting a position of the mover, a differentiator for performing time differentiation with respect to ... | 04/11/2006 |
| 6998810 | Position controller of feed shaft A position controller for controlling a position of a feed shaft of a machine having a motor and the feed shaft driven by the motor is provided. A subtractor calculates a difference between a speed instruction and a speed detection value of a motor and outputs as a ... | 02/14/2006 |
| 6847857 | Thread machining control method and apparatus therefor It is strongly demanded that a stable thread machining process be attained by carrying out a thread machining operation while varying the rotational frequency of a spindle, and thereby restraining the occurrence of cutting chatter. According to the present invention... | 01/25/2005 |
| 6634265 | Apparatus for exchanging workpieces The invention provides an apparatus for exchanging workpieces which reduces the time required for exchanging workpieces by cutting down to a minimum the moving distance and the waiting time of a workpiece transport means. By the movement of a headstock 1,... | 10/21/2003 |
| 6609706 | Work fixing jig for machine tools A work fixing jig for machine tools is attached to a table of the machine tool utilizing a mount bore formed in a work fixing surface of the table for use in fixing work to the table by work fixing means. The jig comprises a jig main body, a generally cyl... | 08/26/2003 |
| 6584415 | Method of creating tool wear data, estimating tool wear and judging use of tool A tool management method, when performing machining using a Numerical Control (NC) program, searches for cutting tool status information obtained as a result of having performed a machining simulation based on tool information, cutting condition informati... | 06/24/2003 |
| 6408216 | Position control apparatus using servomotor The present invention provides a position control apparatus in which a motor output torque can be approximated to that of the maximum output torque curve of the motor by generating a position command combining constant acceleration and exponential acceler... | 06/18/2002 |
| 6400998 | Generation of measurement program in NC machining and machining management based on the measurement program A method and apparatus for NC machining management based on a measurement program, wherein a machining shape at an arbitrary machining stage is determined by an NC program, a geometric element or a geometric model is generated, and a measurement program i... | 06/04/2002 |
| 6368222 | Universal joint and parallel mechanism machine incorporating the universal joint A universal joint having two or three degrees of freedom in rotation is disclosed which exhibits a small size, great rigidity and satisfactory accuracy. An end of a first node is connected to a base through a rolling bearing. A plurality of circular-arc g... | 04/09/2002 |
| 6211593 | Synchronous motor with permanent magnet provided on magnetic pole end A synchronous motor comprising permanent magnets (35, 41) with N poles arranged at ends of N magnetic poles of a rotor, permanent magnets (38, 34) with S poles arranged at ends of S magnetic poles of the rotor, magnetic pole portions (40) made of soft mag... | 04/03/2001 |
| 6208108 | Controller for reluctance type synchronous motor A controller for a reluctance type synchronous motor. When field current control depends solely on a rotor speed, large power consumption and heat generation of a motor may be caused. Also, when a field current is small, torque consumption becomes small, ... | 03/27/2001 |
| 6203254 | Parallel mechanism machining device The present invention is designed to realize structure having high rigidity in any direction and to realize a parallel mechanism machining device having good chip removal property. According to the present invention, forked adjustable joints 28 are provid... | 03/20/2001 |
| 6144132 | Permanent magnet motor A permanent magnet motor is provided comprising a plurality of individual permanent magnets 7 threaded inside of a rotor, an N pole magnetic circuit commonly connected to N poles of the plurality of individual permanent magnets 7, an S pole magnetic circu... | 11/07/2000 |
| 6055461 | Numerical control apparatus having numeric data display function The object of the present invention is to make it possible to obtain information on a plurality of working conditions at one time from a display unit even if an operator is away from the display unit. To confirm a cutting condition or the like, the operat... | 04/25/2000 |
| 5981942 | Optical encoder for detecting relative displacement based on signals having predetermined phase differences The optical encoder is capable of detecting phases at positions which coincide more strictly than the phase detecting positions of a conventional optical encoder, and is thereby capable of outputting less distorted displacement signals with a sufficient a... | 11/09/1999 |
| 5833407 | Method for estimating heat-included displacment in a machine tool There is provided a method for estimating the thermal displacement of a component of a machine tool comprising the steps of detecting the temperature of at lease one rotatable component of a machine tool having a variable rotational speed and a variable t... | 11/10/1998 |
