Patents by Inventor Tadashi Kawaguchi

Tadashi Kawaguchi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20100071973
    Abstract: A method of controlling a hybrid construction machine capable of preventing a system from being rendered inoperative without increasing a capacitance of a capacitor and of inhibiting delay of a swing operation relative to an operation command at the time of swing operation, and the hybrid construction machine are provided. For this purpose, at the time of discharge of the capacitor, actual torque command values are respectively generated by referring to an assist torque limit value corresponding to capacitor voltage of a generator motor and a swing power running torque limit value corresponding to the capacitor voltage of a swing motor, as well as, at the time of charge of the capacitor, an actual target output value of the generator motor is generated.
    Type: Application
    Filed: March 27, 2008
    Publication date: March 25, 2010
    Applicant: Komatsu Ltd.
    Inventors: Jun Morinaga, Tadashi Kawaguchi, Hiroaki Inoue
  • Publication number: 20100064677
    Abstract: A work machine includes: hydraulic actuators 21, 22, 23, 31, and 32; a capacitor 61 for storing electric power when a generator motor 44 operates as a generator and for supplying electric power when the generator motor 44 operates as a motor; and a swing electric motor 10, the hydraulic actuators 21, 22, 23, 31, and 32 and the swing electric motor 10 are operated by operation of operating levers 50, 70. The work machine includes an idling stop control unit 110 for stopping the idling of an engine 40 and retains the swing electric motor 10 in an operation prohibited state at least on the condition that stored voltage of the capacitor 61 is predetermined voltage or higher when the neutral states of the operating levers 50, 70 continue for a predetermined stop time during operation of the engine 40.
    Type: Application
    Filed: March 28, 2008
    Publication date: March 18, 2010
    Applicant: Komatsu Ltd.
    Inventors: Tadashi Kawaguchi, Jun Morinaga, Hiroaki Inoue
  • Publication number: 20100031650
    Abstract: The present invention provides a construction machine where overheating of mounted electric devices can be prevented properly with a simple structure and a method of controlling the construction machine. For this purpose, a pump target discharge flow rate of a hydraulic pump is calculated based on an operated amount of an operating unit, a temperature of an electric device mounted on the construction machine is detected, an engine minimum speed, which is a minimum possible speed of an engine in carrying out low-speed matching for matching output of the engine and pump absorbing horsepower of the hydraulic pump to each other in a low-speed region where speed of the engine is lower than set speed, is calculated by using the detected temperature of the electric device, and a maximum value out of a corresponding speed of the pump target discharge flow rate and the engine minimum speed is generated as a candidate for an engine target speed.
    Type: Application
    Filed: March 27, 2008
    Publication date: February 11, 2010
    Applicant: Komatsu Ltd.
    Inventors: Jun Morinaga, Hiroaki Inoue, Tadashi Kawaguchi
  • Publication number: 20090320461
    Abstract: An object of the present invention is to operate the working machine etc. with satisfactory responsiveness as intended by the operator while enhancing engine efficiency, pump efficiency, and the like, where a first engine target revolution ncom1 adapted to a current pump target discharge flow rate Qsum is set, and when determined that the current pump target discharge flow rate Qsum is greater than a predetermined flow rate (10 (L/min)), a revolution nM (e.g., 1400 rpm) greater than an engine low idle revolution nL is set as a second engine target revolution ncom2 determining that operation levers 41 to 44 switched from a non-operation state to an operation state. The engine revolution is controlled so that the second engine target revolution ncom2 is obtained if the second engine target revolution ncom2 is equal to or greater than the first engine target revolution ncom1.
    Type: Application
    Filed: October 27, 2006
    Publication date: December 31, 2009
    Applicant: Komatsu Ltd.
    Inventors: Jun Morinaga, Tadashi Kawaguchi, Hiroaki Inoue
  • Publication number: 20090301075
    Abstract: A speed of a hydraulic actuator is matched with that of an electric actuator when the hydraulic actuator and the electric actuator are concurrently actuated. When determination units (71, 72) determine that a boom hydraulic cylinder (31) and a rotation generator motor (11) are concurrently actuated based on a controlled variable of a boom control lever (41) and a controlled variable of a rotation control lever (42), a torque of the rotation generator motor (11) is restricted based on a pump discharge pressure (Pp). Therefore, for example, a torque limit command is generated and output such that a torque limit value (TL2) of the rotation generator motor (11) is decreased with a decrease in discharge pressure (Pp) of a hydraulic pump (3).
    Type: Application
    Filed: October 26, 2006
    Publication date: December 10, 2009
    Applicant: Komatsu Ltd.
    Inventors: Jun Morinaga, Tadashi Kawaguchi, Hiroaki Inoue
  • Publication number: 20090285586
    Abstract: An apparatus which is capable of substantially prolonging the service live of each component part and preventing the degradation of apparatus specifications before and after parts interchange work by the user. A controller of the image forming apparatus detects a component part requiring interchange from among the component parts based on wear ratios of the respective component parts. The controller determines whether or not to interchange the component part requiring interchange with another component part, based on the wear ratios of the respective component parts and usage rate of the respective component positions. When it is determined that the component part requiring interchange should be interchanged with another component part, the image forming apparatus issues a parts interchange notification.
    Type: Application
    Filed: May 8, 2009
    Publication date: November 19, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Tadashi Kawaguchi
  • Patent number: 7615960
    Abstract: In stopping a rotary body of an electric rotary excavator (a construction machine), a control-system changing unit of a rotation control device changes a control law from a speed control law to a position control law when a target speed is judged to be smaller than a speed threshold value. By changing to the position control, a larger braking torque can be output to an electric motor as compared with that in the speed control, thereby reliably maintaining the rotary body in a stationary state.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: November 10, 2009
    Assignee: Komatsu Ltd.
    Inventors: Jun Morinaga, Tadashi Kawaguchi, Hiroaki Inoue
  • Publication number: 20090235242
    Abstract: An image forming apparatus which is capable of more reliably ensuring the operation of the apparatus having software files therein updated remotely and reducing an operational burden on the user. A ROM stores a plurality of software files. A scanner section and a printer section execute functions provided by the image forming apparatus, using the software files. An NIC section receives an update software file for updating at least one of the software files from an image processing apparatus. After a software file is updated based on the update software file received by the NIC section, a function using the updated software file is executed, a core section causes the image forming apparatus to operate in an functional check mode for checking operation of the executed function.
    Type: Application
    Filed: February 9, 2009
    Publication date: September 17, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Tadashi Kawaguchi
  • Publication number: 20080249691
    Abstract: A rotation controller of an electric rotary excavator is provided with a gear drive controller that includes a backlash determination device and a torque limit setting device. With the arrangement, since an output torque of an electric motor is limited by a torque limit when a backlash is eliminated, an excessive torque is prevented from being output. After that, the output torque is gradually changed by an output control device of the gear drive controller. Accordingly, since acceleration and deceleration of a rotary body is performed without causing an operator to feel uncomfortableness, a shock generated when the backlash is eliminated can be suppressed. As a result, smooth rotation operation free from an influence of the backlash can be realized.
    Type: Application
    Filed: September 22, 2005
    Publication date: October 9, 2008
    Applicant: KOMATSU LTD.
    Inventors: Tadashi Kawaguchi, Jun Morinaga
  • Publication number: 20080164832
    Abstract: To rotate a rotary body at a constant velocity, a swing control device 50 of an electric rotary excavator controls the rotation of the rotary body with a small first torque command value T1. Thus, when inertia moment of the rotary body is changed due to extension or retraction of a boom and an arm, the change of the inertia moment affects the rotation velocity of the rotary body, and an operator can perform a rotation operation with the same feeling as in a hydraulically-driven excavator. In contrast, when operating a swing lever 10 for acceleration, the rotation is controlled with a large second torque command value T2. Accordingly, a good and quick operational feeling is obtained without a delay in acceleration or deceleration, and the degradation of workability can be avoided.
    Type: Application
    Filed: November 16, 2005
    Publication date: July 10, 2008
    Applicant: KOMATSU LTD.
    Inventors: Tadashi Kawaguchi, Jun Morinaga
  • Patent number: 7362071
    Abstract: In an electric rotary excavator (construction machine) 1, when earth pressure acts on a rotary body 4 in an opposite direction to an instructed direction of a lever, a control-system changing means 150 of a rotation control device 100 increases a torque output of an electric motor 5 that drives the rotary body 4. Accordingly, the torque output can properly react against the acting earth pressure, thereby preventing the rotary body from continuing to be rotated in the opposite direction. Therefore, even when the earth pressure becomes large, the work will not be affected. In addition, when the rotary body is rotated on a slope, the rotary body can be prevented from being rotated back greatly due to the weights of the boom and the arm.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: April 22, 2008
    Assignee: Komatsu Ltd.
    Inventors: Jun Morinaga, Tadashi Kawaguchi
  • Publication number: 20080065298
    Abstract: In an excavator equipped with an offset boom, an offset command value generating means 56 of a rotation control device 50 offsets a second boom 62 arranged on a distal end side in a rotation direction relative to a first boom arranged on a proximal end side when an acceleration start judging means 53 judges that a rotation operation is started, and offsets the second boom 62 in a reverse rotation direction when a deceleration start judging means 54 judges that a rotation deceleration operation is started. Accordingly, when a rotation acceleration is performed using a reaction force generated in the offset, clearances between members of a work machine can be contracted in advance in the rotation direction, while when the rotation deceleration operation is performed, these clearances can be contracted in advance in the rotation reverse direction, thereby reducing an impact in the acceleration and deceleration.
    Type: Application
    Filed: September 22, 2005
    Publication date: March 13, 2008
    Inventor: Tadashi Kawaguchi
  • Publication number: 20070277986
    Abstract: In a swing control device installed in an electric rotary excavator (a construction machine), when a leading edge or a trailing edge of a lever signal is sharp due to a quick operation of a swing lever, a gradient as a rise time Ta1 or a fall time Tb1 is provided to the leading edge or the trailing edge of the torque output and the acceleration that are output based on the lever signal so as to somewhat ease the edge. With the arrangement, an impact in acceleration or deceleration of a rotary body can be suppressed. Specifically, a gradient in the acceleration operation is provided such that the rise time Ta1 becomes 0.15 seconds or more, while a gradient in the stop deceleration operation is provided such that the fall time Tb1 becomes 0.1 seconds or more.
    Type: Application
    Filed: November 16, 2005
    Publication date: December 6, 2007
    Applicant: Komatsu LTD
    Inventors: Jun Morinaga, Tadashi Kawaguchi, Hiroaki Inoue
  • Publication number: 20070216331
    Abstract: In an electric rotary excavator (construction machine) 1, when earth pressure acts on a rotary body 4 in an opposite direction to an instructed direction of a lever, a control-system changing means 150 of a rotation control device 100 increases a torque output of an electric motor 5 that drives the rotary body 4. Accordingly, the torque output can properly react against the acting earth pressure, thereby preventing the rotary body from continuing to be rotated in the opposite direction. Therefore, even when the earth pressure becomes large, the work will not be affected. In addition, when the rotary body is rotated on a slope, the rotary body can be prevented from being rotated back greatly due to the weights of the boom and the arm.
    Type: Application
    Filed: May 13, 2005
    Publication date: September 20, 2007
    Inventors: Jun Morinaga, Tadashi Kawaguchi
  • Publication number: 20060080494
    Abstract: A data processing apparatus and a data erasing method therefor which are capable of suppressing the capacity of a backup power supply to be used (operating time) and eliminating the disadvantage that a third party steals a look at data to thereby improve security. Data is input, and predetermined processing is performed on the input data. The data is stored in a nonvolatile memory such as a HD. A first voltage supply unit supplies voltage to the memory, and a second voltage unit supplies voltage to the memory when the first voltage supply unit is incapable of supplying voltage to the memory. When the first voltage supply unit becomes incapable of supplying voltage to the memory, the memory is controlled to erase the data stored therein using a selected one of a plurality of erasing processes depending on the status of processing of the data.
    Type: Application
    Filed: September 22, 2005
    Publication date: April 13, 2006
    Applicant: Canon Kabushiki Kaisha
    Inventors: Tadashi Kawaguchi, Hideki Hirose, Kei Morita, Eijiro Atarashi, Takahiro Haraguchi, Fumio Mikami
  • Publication number: 20060044613
    Abstract: Disclosed is an image forming apparatus that can restore a defective area on a storage medium, and can appropriately and immediately notify the user of image data which image data written in the defective area have been destroyed. To accomplish this, when the detection of a defective sector has been started, and a defective sector is detected, a CPU is notified of the logic block address of the defective sector, and a replacement prepared in a spare area is allocated to restore the defective sector. When image data is present in the defective sector, an image data file name pertinent to the logic block address of the defective sector is stored. And when the detection process has been completed up to the last sector, an email is transmitted to the box user pertinent to the logic block address for the defective sector.
    Type: Application
    Filed: August 4, 2005
    Publication date: March 2, 2006
    Applicant: Canon Kabushiki Kaisha
    Inventors: Hideki Hirose, Kei Morita, Eijiro Atarashi, Takahiro Haraguchi, Tadashi Kawaguchi, Fumio Mikami
  • Publication number: 20050281405
    Abstract: A print system which are capable of inhibiting simultaneous use of the encrypted print and the box storage to thereby increase the security of print data. A host computer has an encryption function of encrypting print data, and issues a print job for the print data encrypted by the encryption function. A print server receives the issued print job, and has a decryption function of decrypting the encrypted print data of the received print job. A printer has a storage function of storing the print data decrypted by the decryption function, and outputs the stored print data. At least one of the host computer and the print server inhibits simultaneous use of the encryption function and the storage function.
    Type: Application
    Filed: March 3, 2005
    Publication date: December 22, 2005
    Applicant: Canon Kabushiki Kaisha
    Inventors: Hiroshi Uchikawa, Yushi Matsukubo, Fumio Mikami, Yoshinobu Umeda, Tadashi Kawaguchi, Yoshio Kimura, Yasuhiko Hirano, Hitoshi Imai, Hiroyasu Morita
  • Publication number: 20050219610
    Abstract: An information processing apparatus connected to a printing apparatus via a network encrypts print data if identification information is input, and does not encrypt print data if identification information is not input. If identification information is input and the print data has been encrypted, the information processing apparatus sends a print job including the encrypted print data to the printing apparatus via the network; otherwise, the information processing apparatus sends unencrypted print data to the printing apparatus via the network.
    Type: Application
    Filed: January 21, 2005
    Publication date: October 6, 2005
    Applicant: Canon Kabushiki Kaisha
    Inventors: Yoshio Kimura, Yushi Matsukubo, Fumio Mikami, Yoshinobu Umeda, Tadashi Kawaguchi, Hiroshi Uchikawa, Yasuhiko Hirano, Hitoshi Imai, Hiroyasu Morita
  • Patent number: 6359698
    Abstract: When data is received from a host computer A, a printing apparatus stores the received data in a reception buffer that has been segmented into memory blocks of a prescribed size. When one memory block is filled to capacity with the data received from host computer A, the printing apparatus determines whether there is a print request from another host computer. If there is a print request from a host computer other than host computer A, reception of the printing data accompanying this request is started and the data is stored in an unused memory block of the reception buffer. When this memory block is filled to capacity, reception of data from the host A is resumed. Thus, the printing apparatus receives data from a plurality of host computers concurrently and prints out data the reception of which has ended.
    Type: Grant
    Filed: December 3, 1992
    Date of Patent: March 19, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tadashi Kawaguchi
  • Patent number: 5822572
    Abstract: Electronic equipment having a CPU. The operating clock frequency that is switched according to the access state to the CPU is detected. The active time provided for each of a plurality of timing signals for rendering a peripheral circuit operable is shortened according to the detected operating clock frequency. The resulting timing signals are then output to the peripheral circuit.
    Type: Grant
    Filed: March 6, 1996
    Date of Patent: October 13, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tadashi Kawaguchi