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: 20130073111
    Abstract: A control device of an electric actuator adapted to perform a forward-reverse movement includes a control unit adapted to be operated in a forward direction or a reverse direction in accordance with the forward-reverse movement of the electric actuator. It also includes a pilot circuit, which is connected to the control unit and which generates a forward pilot pressure or a reverse pilot pressure in accordance with the forward operation or the reverse operation of the control unit. The control device has a differential pressure acquiring unit that acquires a differential pressure between a pilot pressure corresponding to an operation direction of the control unit and a pilot pressure, in a direction opposite to the operation direction, and it has a control command generator that generates a control command for controlling the electric actuator based on the differential pressure acquired by the differential pressure acquiring unit.
    Type: Application
    Filed: May 11, 2011
    Publication date: March 21, 2013
    Applicant: KOMATSU LTD.
    Inventors: Hiroaki Take, Tadashi Kawaguchi, Jun Morinaga
  • Patent number: 8214110
    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: Grant
    Filed: March 27, 2008
    Date of Patent: July 3, 2012
    Assignee: Komatsu Ltd.
    Inventors: Jun Morinaga, Hiroaki Inoue, Tadashi Kawaguchi
  • Patent number: 8207708
    Abstract: A power generation control method of a hybrid construction machine capable of maintaining voltage of a capacitor in an appropriate range while minimizing capacitance of the capacitor and of surely preventing a system from being rendered inoperative, and the hybrid construction machine are provided. For this purpose, swing power corresponding to electric power consumed by a swing motor for swinging a part of a body relative to other parts is sequentially calculated, a value of the calculated swing power is converted to a smaller value, a power generation command of a generator motor is sequentially generated using the converted value, and the generated power generation command is output to an inverter for driving the generator motor.
    Type: Grant
    Filed: March 21, 2008
    Date of Patent: June 26, 2012
    Assignee: Komatsu Ltd.
    Inventors: Jun Morinaga, Tadashi Kawaguchi, Hiroaki Inoue
  • Publication number: 20120140287
    Abstract: A printing apparatus having a reprint function includes a determination unit to determine whether newly input print data are able to be stored in an empty area of a data storage area, a selection unit to, if the determination unit determines that the newly input print data are not able to be stored in the empty area of the data storage area, select print data that matches a priority deletion condition from among print data pieces that have already been stored, a change unit to change, among deletion order information indicating a deletion order of the print data pieces stored in the data storage area, a deletion order corresponding to the print data selected by the selection unit, a deletion unit to delete corresponding print data based on the deletion order information, and a storage unit configured to store the newly input print data in the empty area.
    Type: Application
    Filed: November 23, 2011
    Publication date: June 7, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Tadashi Kawaguchi
  • Patent number: 8180229
    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: Grant
    Filed: May 8, 2009
    Date of Patent: May 15, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tadashi Kawaguchi
  • Patent number: 8087240
    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: Grant
    Filed: October 26, 2006
    Date of Patent: January 3, 2012
    Assignee: Komatsu Ltd.
    Inventors: Jun Morinaga, Tadashi Kawaguchi, Hiroaki Inoue
  • Patent number: 8059300
    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: Grant
    Filed: July 14, 2010
    Date of Patent: November 15, 2011
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshio Kimura, Yushi Matsukubo, Fumio Mikami, Yoshinobu Umeda, Tadashi Kawaguchi, Hiroshi Uchikawa, Yasuhiko Hirano, Hitoshi Imai, Hiroyasu Morita
  • Publication number: 20110265279
    Abstract: A cleaning sponge roller 1 is made of a polyvinyl acetal porous material having elasticity in a wet state, and includes a roller body 3 in an approximate cylinder form, and a plurality of protrusions 5 formed integrally on an outer peripheral surface 3a of the roller body 3, and rotates the multiple protrusions 5 to make contact with a surface to be cleaned so as to clean the surface. Outer surfaces of the protrusions 5 respectively have a top outer surface 5a (interior exposed surface) making contact with the surface to be cleaned while cleaning in a state where internal structures of the protrusions 5 are exposed.
    Type: Application
    Filed: June 22, 2009
    Publication date: November 3, 2011
    Applicant: AION CO., LTD.
    Inventors: Tadashi Kawaguchi, Hidehiko Tsukada, Takashi Yamanaka
  • Patent number: 8000862
    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: Grant
    Filed: November 16, 2005
    Date of Patent: August 16, 2011
    Assignee: Komatsu Ltd.
    Inventors: Jun Morinaga, Tadashi Kawaguchi, Hiroaki Inoue
  • Publication number: 20110125931
    Abstract: A wireless connection system capable of reducing a load on a user when constructing wireless connection environment including a host and devices. A wireless connection system comprises a host computer, a first device that has established a wireless connection with the host computer based on first association information, and a second device that has not established the wireless connection with the host computer. The host computer generates second association information for the wireless connection with the second device, and transmits the second association information to the first device by radio. The first device stores the second association information into a removable memory device when equipped with the removable memory device.
    Type: Application
    Filed: November 10, 2010
    Publication date: May 26, 2011
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Tadashi Kawaguchi
  • Publication number: 20110088191
    Abstract: An approximately cylindrical central core for cleaning sponge roller having an axially extending internal hole and multiple small holes realizing communication from the internal hole to the circumferential external surface. The central core for cleaning sponge roller is characterized in that the external surface of the central core is provided in the circumferential direction with multiple axially slender projections and that the projections each has an axial section viewed from a direction perpendicular to the axial direction that is not flat.
    Type: Application
    Filed: June 6, 2008
    Publication date: April 21, 2011
    Applicant: AION CO., LTD.
    Inventors: Nagayo Oohiro, Tadashi Kawaguchi, Hiroshi Miyaji
  • Publication number: 20110069338
    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: November 24, 2010
    Publication date: March 24, 2011
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Hiroshi UCHIKAWA, Yushi MATSUKUBO, Fumio MIKAMI, Yoshinobu UMEDA, Tadashi KAWAGUCHI, Yoshio KIMURA, Yasuhiko HIRANO, Hitoshi IMAI, Hiroyasu MORITA
  • Patent number: 7869923
    Abstract: In an excavator equipped with an offset boom, an offset command value generating device of a rotation control device offsets a second boom 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 device judges that a rotation operation is started, and offsets the second boom in a reverse rotation direction when a deceleration start judging device 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: Grant
    Filed: September 22, 2005
    Date of Patent: January 11, 2011
    Assignee: Komatsu Ltd.
    Inventor: Tadashi Kawaguchi
  • Patent number: 7864955
    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: Grant
    Filed: March 3, 2005
    Date of Patent: January 4, 2011
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroshi Uchikawa, Yushi Matsukubo, Fumio Mikami, Yoshinobu Umeda, Tadashi Kawaguchi, Yoshio Kimura, Yasuhiko Hirano, Hitoshi Imai, Hiroyasu Morita
  • Publication number: 20100277755
    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: July 14, 2010
    Publication date: November 4, 2010
    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: 7782477
    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: Grant
    Filed: January 21, 2005
    Date of Patent: August 24, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshio Kimura, Yushi Matsukubo, Fumio Mikami, Yoshinobu Umeda, Tadashi Kawaguchi, Hiroshi Uchikawa, Yasuhiko Hirano, Hitoshi Imai, Hiroyasu Morita
  • Patent number: 7772792
    Abstract: To rotate a rotary body at a constant velocity, a swing control device of an electric rotary excavator controls rotation of the rotary body with a small first torque command value. By contrast, when operating a swing lever for acceleration, the rotation is controlled with a larger second torque command value. The first torque command value is generated based on a deviation between a velocity command value for an electric motor that rotates the rotary body and a measured velocity of the rotary body, and the second torque command value has a larger absolute value than the first torque command value and is obtained by adding a feed-forward torque command value to the first torque command value.
    Type: Grant
    Filed: November 16, 2005
    Date of Patent: August 10, 2010
    Assignee: Komatsu Ltd.
    Inventors: Tadashi Kawaguchi, Jun Morinaga
  • Publication number: 20100186713
    Abstract: An engine control apparatus includes an engine target speed set unit 51 setting a first target speed through a throttle dial, a relief engine maximum speed calculation unit 52 calculating a second target speed limiting a maximum target speed in a relief operation according to a load pressure of a hydraulic pump, a speed control means controlling an engine speed such that the engine speed is equal to lower one of the first target speed and the second target speed, a determination means determining whether an engine torque assist action of a generator motor is performed, based on a deviation between an target speed and a real speed of the engine. When the determination means determines that the engine torque assist action is performed, the speed control means controls the engine speed to be equal to the target speed through the engine torque assist action of the generator motor.
    Type: Application
    Filed: September 11, 2008
    Publication date: July 29, 2010
    Applicant: KOMATSU LTD.
    Inventors: Tadashi Kawaguchi, Jun Morinaga, Hiroaki Inoue
  • Patent number: 7730541
    Abstract: A data processing apparatus secures data from third parties in event of power loss by utilizing a backup power supply to provide power while data is erased from memory. The data is stored in a nonvolatile memory. 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: Grant
    Filed: September 22, 2005
    Date of Patent: June 1, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tadashi Kawaguchi, Hideki Hirose, Kei Morita, Eijiro Atarashi, Takahiro Haraguchi, Fumio Mikami
  • Publication number: 20100097037
    Abstract: A power generation control method of a hybrid construction machine capable of maintaining voltage of a capacitor in an appropriate range while minimizing capacitance of the capacitor and of surely preventing a system from being rendered inoperative, and the hybrid construction machine are provided. For this purpose, swing power corresponding to electric power consumed by a swing motor for swinging a part of a body relative to other parts is sequentially calculated, a value of the calculated swing power is converted to a smaller value, a power generation command of a generator motor is sequentially generated using the converted value, and the generated power generation command is output to an inverter for driving the generator motor.
    Type: Application
    Filed: March 21, 2008
    Publication date: April 22, 2010
    Inventors: Jun Morinaga, Tadashi Kawaguchi, Hiroaki Inoue