Patents by Inventor Takeo Seki
Takeo Seki 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).
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Patent number: 10656585Abstract: According to an embodiment, a consumable management apparatus includes a detecting unit, a storage unit, an analyzing circuit, a predicting circuit, and a notifying circuit. The detecting unit detects a use condition of a consumable. The storage unit stores therein a use history of the consumable. The analyzing circuit is configured to analyze a consumption speed of the consumable based on a degree of use frequency of the consumable, the degree of use frequency being obtained from the use history of the consumable stored in the storage unit. The predicting circuit is configured to predict a replacement time of the consumable from the use condition of the consumable detected by the detecting unit and the consumption speed of the consumable analyzed by the analyzing circuit. The notifying circuit is configured to give a notice of the replacement time of the consumable predicted by the predicting circuit.Type: GrantFiled: March 18, 2019Date of Patent: May 19, 2020Assignee: Ricoh Company, Ltd.Inventors: Takeo Seki, Akiyoshi Nakai, Ko Tokumaru, Masaru Kaneko
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Patent number: 10472194Abstract: A current detecting device includes: a drive signal generating unit configured to generate a control signal based on a control voltage value indicating drive force to be applied to a target; a current detecting unit configured to detect a current value output based on the control signal generated by the drive signal generating unit; and a correction unit configured to correct the current value detected by the current detecting unit, based on at least a magnitude of the control voltage value.Type: GrantFiled: January 3, 2017Date of Patent: November 12, 2019Assignee: RICOH COMPANY, LTD.Inventors: Takeo Seki, Haruyuki Suzuki, Takuya Murata, Hiroyuki Kiguchi
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Publication number: 20190286038Abstract: According to an embodiment, a consumable management apparatus includes a detecting unit, a storage unit, an analyzing circuit, a predicting circuit, and a notifying circuit. The detecting unit detects a use condition of a consumable. The storage unit stores therein a use history of the consumable. The analyzing circuit is configured to analyze a consumption speed of the consumable based on a degree of use frequency of the consumable, the degree of use frequency being obtained from the use history of the consumable stored in the storage unit. The predicting circuit is configured to predict a replacement time of the consumable from the use condition of the consumable detected by the detecting unit and the consumption speed of the consumable analyzed by the analyzing circuit. The notifying circuit is configured to give a notice of the replacement time of the consumable predicted by the predicting circuit.Type: ApplicationFiled: March 18, 2019Publication date: September 19, 2019Inventors: Takeo Seki, Akiyoshi Nakai, Ko Tokumaru, Masaru Kaneko
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Patent number: 10224859Abstract: A motor control device includes a detecting unit configured to detect rotation of a motor to be controlled and output a rotation detection value related to the rotation; a drive control unit configured to perform drive control to rotate the motor at a control target value increasing with time based on the rotation detection value; and an abnormality detection unit configured to perform an abnormality detection process for detecting an abnormality in the drive control based on the rotation detection value and a predetermined threshold. The drive control unit performs control to stop rotation of the motor when the abnormality is detected.Type: GrantFiled: March 19, 2018Date of Patent: March 5, 2019Assignee: RICOH COMPANY, LTD.Inventors: Hiroyuki Kiguchi, Takeo Seki, Natsuko Ishizuka, Takuya Murata
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Patent number: 10053317Abstract: A contact-and-separation system includes a first roller, a second roller, and a contact-and-separation device. The first roller contacts a belt. The second roller is opposed to the first roller. The contact-and-separation device contacts or separates the belt to or from the second roller via a sheet conveyed. The contact-and-separation device includes an eccentric cam, a motor, and a circuitry. The eccentric cam is mounted on an end of a rotation shaft of the first roller. The motor rotates the eccentric cam. The circuitry controls the motor to rotate the eccentric cam to contact or separate the belt to or from the second roller via the sheet conveyed. The circuitry controls the motor to decelerate a rotation speed of the motor on contact or separation of the belt to or from the second roller between the first roller and the second roller.Type: GrantFiled: July 28, 2017Date of Patent: August 21, 2018Assignee: RICOH COMPANY, LTD.Inventors: Shogo Nakamoto, Takeo Seki, Takuya Murata, Shogo Sakamoto
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Publication number: 20180212548Abstract: A motor control device includes a detecting unit configured to detect rotation of a motor to be controlled and output a rotation detection value related to the rotation; a drive control unit configured to perform drive control to rotate the motor at a control target value increasing with time based on the rotation detection value; and an abnormality detection unit configured to perform an abnormality detection process for detecting an abnormality in the drive control based on the rotation detection value and a predetermined threshold. The drive control unit performs control to stop rotation of the motor when the abnormality is detected.Type: ApplicationFiled: March 19, 2018Publication date: July 26, 2018Inventors: Hiroyuki Kiguchi, Takeo Seki, Natsuko Ishizuka, Takuya Murata
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Patent number: 9973133Abstract: A motor control device includes a detecting unit configured to detect rotation of a motor to be controlled and output a rotation detection value related to the rotation; a drive control unit configured to perform drive control to rotate the motor at a control target value increasing with time based on the rotation detection value; and an abnormality detection unit configured to perform an abnormality detection process for detecting an abnormality in the drive control based on the rotation detection value and a predetermined threshold. The drive control unit performs control to stop rotation of the motor when the abnormality is detected.Type: GrantFiled: September 21, 2016Date of Patent: May 15, 2018Assignee: RICOH COMPANY, LTD.Inventors: Hiroyuki Kiguchi, Takeo Seki, Natsuko Ishizuka, Takuya Murata
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Patent number: 9939469Abstract: There is provided a current measuring apparatus for measuring a first current used for estimating a load torque of the motor. The current measuring apparatus may include a detection unit configured to detect a first voltage, an amplification unit including a first input terminal at which the second signal is input, a second input terminal coupled to a first resistor and a second resistor by which an amplification factor is defined, and an output terminal for outputting a third signal, an input unit configured to input a second voltage at the first input terminal, a storage unit configured to store a third voltage an acquisition unit configured to acquire a fourth voltage, and a calculation unit configured to calculate the first current based on a difference between the third voltage and the fourth voltage.Type: GrantFiled: March 7, 2016Date of Patent: April 10, 2018Assignee: Ricoh Company, Ltd.Inventor: Takeo Seki
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Publication number: 20180039221Abstract: A contact-and-separation system includes a first roller, a second roller, and a contact-and-separation device. The first roller contacts a belt. The second roller is opposed to the first roller. The contact-and-separation device contacts or separates the belt to or from the second roller via a sheet conveyed. The contact-and-separation device includes an eccentric cam, a motor, and a circuitry. The eccentric cam is mounted on an end of a rotation shaft of the first roller. The motor rotates the eccentric cam. The circuitry controls the motor to rotate the eccentric cam to contact or separate the belt to or from the second roller via the sheet conveyed. The circuitry controls the motor to decelerate a rotation speed of the motor on contact or separation of the belt to or from the second roller between the first roller and the second roller.Type: ApplicationFiled: July 28, 2017Publication date: February 8, 2018Applicant: Ricoh Company, Ltd.Inventors: Shogo NAKAMOTO, Takeo SEKI, Takuya MURATA, Shogo SAKAMOTO
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Patent number: 9853584Abstract: A load torque estimation apparatus includes an acquisition unit configured to acquire a smoothed signal, the smoothed signal being obtained by smoothing a signal indicating a composite current of electric currents flowing in respective phases of an electric motor; and an estimation unit configured to estimate load torque of the electric motor based on the smoothed signal and a rotational speed of the electric motor.Type: GrantFiled: February 17, 2016Date of Patent: December 26, 2017Assignee: RICOH COMPANY, LTD.Inventor: Takeo Seki
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Publication number: 20170190530Abstract: A current detecting device includes: a drive signal generating unit configured to generate a control signal based on a control voltage value indicating drive force to be applied to a target; a current detecting unit configured to detect a current value output based on the control signal generated by the drive signal generating unit; and a correction unit configured to correct the current value detected by the current detecting unit, based on at least a magnitude of the control voltage value.Type: ApplicationFiled: January 3, 2017Publication date: July 6, 2017Applicant: Ricoh Company, Ltd.Inventors: Takeo SEKI, Haruyuki SUZUKI, Takuya MURATA, Hiroyuki KIGUCHI
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Publication number: 20170012568Abstract: A motor control device includes a detecting unit configured to detect rotation of a motor to be controlled and output a rotation detection value related to the rotation; a drive control unit configured to perform drive control to rotate the motor at a control target value increasing with time based on the rotation detection value; and an abnormality detection unit configured to perform an abnormality detection process for detecting an abnormality in the drive control based on the rotation detection value and a predetermined threshold. The drive control unit performs control to stop rotation of the motor when the abnormality is detected.Type: ApplicationFiled: September 21, 2016Publication date: January 12, 2017Inventors: Hiroyuki KIGUCHI, Takeo SEKI, Natsuko ISHIZUKA, Takuya MURATA
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Patent number: 9515590Abstract: A motor control device includes a controller configured to output a control signal to a motor driver, the control signal instructing the motor driver to cut off energization of a motor when the control signal and a signal changing depending on driving the motor do not change for a first time period, determine whether the motor is in a position hold state in which control for holding the motor at a position is executed, and change the control signal in a second time period shorter than the first time period when the motor is in the position hold state.Type: GrantFiled: January 19, 2015Date of Patent: December 6, 2016Assignee: Ricoh Company, LimitedInventors: Natsuko Ishizuka, Hiroyuki Kiguchi, Takeo Seki, Takuya Murata
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Patent number: 9484845Abstract: A motor control device includes a detecting unit configured to detect rotation of a motor to be controlled and output a rotation detection value related to the rotation; a drive control unit configured to perform drive control to rotate the motor at a control target value increasing with time based on the rotation detection value; and an abnormality detection unit configured to perform an abnormality detection process for detecting an abnormality in the drive control based on the rotation detection value and a predetermined threshold. The drive control unit performs control to stop rotation of the motor when the abnormality is detected.Type: GrantFiled: January 31, 2013Date of Patent: November 1, 2016Assignee: RICOH COMPANY, LTD.Inventors: Hiroyuki Kiguchi, Takeo Seki, Natsuko Ishizuka, Takuya Murata
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Publication number: 20160274152Abstract: There is provided a current measuring apparatus for measuring a first current used for estimating a load torque of the motor, comprising: a detection unit configured to detect a first voltage; an amplification unit including a first input terminal at which the second signal is input, a second input terminal coupled to a first resistor and a second resistor by which an amplification factor is defined, an output terminal for outputting a third signal, a first power supply terminal that is grounded, and a second power supply terminal coupled to a first power supply; an input unit configured to input a second voltage at the first input terminal; a storage unit configured to store a third voltage; an acquisition unit configured to acquire a fourth voltage; and a calculation unit configured to calculate the first current based on a difference between the third voltage and the fourth voltage.Type: ApplicationFiled: March 7, 2016Publication date: September 22, 2016Applicant: Ricoh Company, Ltd.Inventor: Takeo SEKI
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Publication number: 20160248360Abstract: A load torque estimation apparatus includes an acquisition unit configured to acquire a smoothed signal, the smoothed signal being obtained by smoothing a signal indicating a composite current of electric currents flowing in respective phases of an electric motor; and an estimation unit configured to estimate load torque of the electric motor based on the smoothed signal and a rotational speed of the electric motor.Type: ApplicationFiled: February 17, 2016Publication date: August 25, 2016Applicant: Ricoh Company, Ltd.Inventor: Takeo SEKI
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Patent number: 9405281Abstract: A load torque estimation apparatus inputs a controlling value for controlling the electric motor and an actually measured value of a rotational speed of the electric motor to a model to estimate load torque of the electric motor; and derives a mechanical time constant of the electric motor corresponding to the load torque estimated by the estimation part. The load torque estimation apparatus updates the mechanical time constant included in the model by using the mechanical time constant corresponding to the load torque estimated at an (n?1)th control period (where n denotes an integer greater than or equal to 2) and estimates the load torque of the electric motor at an nth control period by inputting the controlling value and the actually measured value acquired at the nth control period to the model acquired through the updating.Type: GrantFiled: September 9, 2014Date of Patent: August 2, 2016Assignee: Ricoh Company, Ltd.Inventors: Takeo Seki, Yoshihiro Takahashi
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Patent number: 9395705Abstract: A load torque estimation apparatus estimates load torque of an electric motor. The apparatus includes an estimation part configured to input a controlling value for controlling the electric motor and an actually measured value of a rotational speed of the electric motor to a model and estimating load torque of the electric motor; and a derivation part configured to derive a mechanical time constant of the electric motor corresponding to the actually measured value of the rotational speed of the electric motor. The estimation part is configured to update, according to a timing of acquiring the actually measured value of the rotational speed of the electric motor, the mechanical time constant included in the model by using the mechanical time constant corresponding to the acquired actually measured value and estimate the load torque of the electric motor by using the updated model.Type: GrantFiled: September 10, 2014Date of Patent: July 19, 2016Assignee: Ricoh Company, Ltd.Inventors: Takeo Seki, Yoshihiro Takahashi
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Patent number: 9323208Abstract: An electric motor system includes a brushless direct-current motor, a driver circuit, a position sensor, and a control circuit. The motor has an output shaft for transmitting torque. The driver circuit supplies power to the motor according to a control signal input thereto. The position sensor measures an angular, rotational position of the motor shaft. The control circuit controls operation of the motor. The control circuit includes a position sensor terminal, a reference terminal, a differential calculator, a controller, and a gain adjuster. The position sensor terminal receives a feedback signal. The reference terminal receives a reference signal. The differential calculator generates an error signal representing a difference between the measured and targeted rotational positions. The controller generates the control signal based on the error signal through a combination of control actions. The gain adjuster is connected to the controller to adjust a gain of each control action.Type: GrantFiled: December 31, 2014Date of Patent: April 26, 2016Assignee: Ricoh Company, Ltd.Inventors: Shogo Sakamoto, Takuya Murata, Takeo Seki, Hiroyuki Kiguchi
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Patent number: 9106164Abstract: A motor control device to execute speed control and position control of motor simultaneously, includes a target position information provider, a target speed information provider, a detected position information detector, a processor to add position feedback information, position feed-forward information, speed feedback information, and speed feed-forward information for output as motor control information, based on the target position information, the setting target speed information, and the detected position speed information, a control voltage generator operatively connected to the processor to generate a control voltage to drive the motor in accordance with the motor control information, and a motor driver operatively connected to the control voltage generator and the motor to control rotation of the motor based on the control voltage.Type: GrantFiled: January 25, 2013Date of Patent: August 11, 2015Assignee: Ricoh Company, Ltd.Inventors: Takeo Seki, Hiroyuki Kiguchi, Natsuko Ishizuka, Takuya Murata