Patents Assigned to Citizen Watch Co., Ltd.
  • Publication number: 20220314332
    Abstract: A machine tool and a controller for the machine tool that accurately detect a defect in a cutting-off process due to breakage of a cutting-off bit and the like is provided. The machine tool includes: a spindle 110 for holding one end side of a workpiece W; an opposed chuck 131 that is opposed to the spindle 110 and is movable with holding another end side of the workpiece W; and a spindle moving motor 122 for moving the spindle 110. The machine tool or the controller is provided with a load detector 172 for detecting a load of the spindle moving motor 122, and workpiece separation detector 173 for detecting a defect in a cutting-off process from the load in performing a taking out operation.
    Type: Application
    Filed: August 17, 2020
    Publication date: October 6, 2022
    Applicants: CITIZEN WATCH CO., LTD., CITIZEN MACHINERY CO., LTD.
    Inventor: Toshiyuki SUZUKI
  • Patent number: 11446781
    Abstract: A control device for a machine tool and a machine tool capable of easily performing cutting with vibration according to the amount of feed is provided. A control device (180) for a machine tool comprises a control means (181) for controlling the relative rotation and feeding of a cutting tool and a material, the control means performing control such that cutting is performed with vibrating the cutting tool relative to the material by combining a forward feed movement in the machining direction, in which the cutting tool machines the material, and a return movement in the counter-machining direction.
    Type: Grant
    Filed: July 26, 2018
    Date of Patent: September 20, 2022
    Assignees: CITIZEN WATCH CO., LTD., CITIZEN MACHINERY CO., LTD.
    Inventors: Takaichi Nakaya, Hiroshi Shinohara
  • Patent number: 11435415
    Abstract: To provide a magnetic sensor element and a magnetic sensor device that can be easily manufactured and can reduce a loss of light to the extent possible. The above-described problem is solved by a magnetic sensor element comprising a planar lightwave circuit (11) provided with a light branching part (12), an input optical fiber (19) and an output optical fiber (20) connected to the planar lightwave circuit (11), a metal magnetic body type light transmitting film (30) that is provided on one end surface of the planar lightwave circuit (11) and transmits light entered from the input optical fiber (19), and a reflecting film (40) that is provided on the metal magnetic body type light transmitting film (30) and reflects the transmitted light. The output optical fiber (20) is a polarization-plane maintaining optical fiber, and the input optical fiber (19) and the output optical fiber (20) are aligned and connected to the planar lightwave circuit (11).
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: September 6, 2022
    Assignees: CITIZEN FINEDEVICE CO., LTD., CITIZEN WATCH CO., LTD., SHINSHU UNIVERSITY
    Inventors: Toshiya Kubo, Mitsunori Miyamoto, Toshiro Sato
  • Publication number: 20220276635
    Abstract: A machining device for scraping a workpiece is provided. The machining device includes: a drive unit for driving a scraper; a first detection unit for detecting the position of the scraper; a second detection unit for detecting the machining force of the scraper with respect to the workpiece; a first acquisition unit for acquiring information relating to displacement of the scraper; a second acquisition unit for acquiring information relating to the machining force of the scraper; and a control unit for driving the drive unit based on the information relating to the displacement of the scraper by the first acquisition unit and the information relating to the machining force of the scraper acquired by the second acquisition unit, so the displacement and the machining force of the scraper satisfy a prescribed relationship. A control device and a control method for the machining device are also provided.
    Type: Application
    Filed: July 15, 2020
    Publication date: September 1, 2022
    Applicant: CITIZEN WATCH CO., LTD.
    Inventors: Yosuke TAKAHASHI, Tadashi MITSUHASHI
  • Patent number: 11422511
    Abstract: An electronic watch with a two-coil stepper motor including: a magnetized rotor; a stator including: first and second stator magnetic-pole portions, which are formed so as to oppose to each other through the rotor; and a third stator magnetic-pole portion, which is formed between the first stator magnetic-pole portion and the second stator magnetic-pole portion so as to face the rotor; a coil A to be magnetically coupled to the first stator magnetic-pole portion and the third stator magnetic-pole portion; and a coil B to be magnetically coupled to the second stator magnetic-pole portion and the third stator magnetic-pole portion; and a high-speed drive pulse generation circuit configured to output a drive pulse for driving the rotor to the coil A or the coil B, and wherein the rotor is rotationally driven in increments of 360° due to a drive pulse train formed of the plurality of drive pulses.
    Type: Grant
    Filed: June 29, 2020
    Date of Patent: August 23, 2022
    Assignee: CITIZEN WATCH CO., LTD.
    Inventors: Yu Takyoh, Toshiaki Fukushima, Toshinari Maeda, Daisuke Iri, Daisuke Matsuoh, Masatoshi Nishida
  • Patent number: 11408066
    Abstract: To provide a decorative member having a cherry blossom pink color. A cherry blossom pink decorative member of the present invention includes a base and a decorative coating formed on the base, wherein the decorative coating is formed by layering an undercoat layer and a finishing layer from the base side, the undercoat layer is a carbonitride layer composed of a carbonitride of a metal containing Ti and at least one selected from Nb and Ta, and the finishing layer is a Au alloy layer composed of an alloy containing Au, a metal having a silver color, and Cu.
    Type: Grant
    Filed: March 27, 2017
    Date of Patent: August 9, 2022
    Assignee: CITIZEN WATCH CO., LTD.
    Inventor: Kotaro Takazaki
  • Patent number: 11409247
    Abstract: In an analog electronic watch system, a terminal equipment detects current display positions of hands in an image of the hands and a dial plate, and generates current display time information based on the current display positions. An analog electronic watch corrects the display positions of the hands based on the display time information. The terminal equipment at least acquires hand identification information including hand shape information about a shape of the hand of the analog electronic watch based on watch identification information transmitted from the analog electronic watch. The terminal equipment detects the current display positions based on the hand identification information, and transmits display time information based on the current display positions to the analog electronic watch.
    Type: Grant
    Filed: January 23, 2019
    Date of Patent: August 9, 2022
    Assignee: CITIZEN WATCH CO., LTD.
    Inventor: Daisuke Matsuoh
  • Publication number: 20220234112
    Abstract: A machine tool includes: a joint portion processing control means for controlling the processing of the joint portion in a joined workpiece such that a first workpiece is gripped by a grip section, and a predetermined region extending from a joint portion of a joined workpiece toward a second workpiece is processed over a range of not less than a predetermined width to have an outer diameter of not more than an outer diameter of the first workpiece; and a movement control means for controlling the movement of the joined workpiece so as to slidingly move the joined workpiece relative to the support section, from a state in which the first workpiece is supported by the support section, up to a state in which the second workpiece is supported by the support section.
    Type: Application
    Filed: June 1, 2020
    Publication date: July 28, 2022
    Applicants: CITIZEN WATCH CO., LTD., CITIZEN MACHINERY CO., LTD.
    Inventors: Toshiyuki SUZUKI, Haruhiko MISONO
  • Patent number: 11396052
    Abstract: A turret tool holder includes an engagement means having engaging elements on a turret side and a support base side, a clutch member for transmitting a driving power to a turret drive section, and a moving mechanism. The moving mechanism includes a rotatably supported drive shaft, a first feed screw mechanism and a second feed screw mechanism rotatable in response to the rotational drive of the drive shaft for moving the clutch member and the engagement elements, and a coordination mechanism arranged between the drive shaft and the first feed screw mechanism or the second feed screw mechanism, for moving the engaging elements in response to the rotational drive of the drive shaft, with a feed amount smaller than the feed amount of the clutch member.
    Type: Grant
    Filed: June 13, 2018
    Date of Patent: July 26, 2022
    Assignees: CITIZEN WATCH CO., LTD., CITIZEN MACHINERY CO., LTD.
    Inventor: Noriyoshi Taguchi
  • Publication number: 20220219273
    Abstract: Provided are a coolant supply device and a machine tool in which ejection of a coolant is easily switched on and off. A coolant supply device 10 for supplying a coolant to a workpiece machining area in a machine tool, the coolant supply device comprising: a rotary nozzle 40 formed to have a cylindrical shape and having, at an outer circumferential face thereof having the cylindrical shape, an ejection port 51 for ejecting the coolant; and a supply device body 20 rotatably supporting the rotary nozzle and configured to be capable of supplying the coolant to the rotary nozzle. The supply device body is configured to be capable of switching an ejection allowed range in which the ejection port is opened and an ejection stopped range in which the ejection port is blocked from each other in accordance with rotation of the rotary nozzle.
    Type: Application
    Filed: May 26, 2020
    Publication date: July 14, 2022
    Applicants: CITIZEN WATCH CO., LTD., CITIZEN MACHINERY CO., LTD.
    Inventors: Koichi YABE, Tadayasu SHIDA, Yosuke ANDO, Shinpei KAI
  • Patent number: 11378920
    Abstract: To reliably rotate a step motor while reducing power consumption, a step motor driving device includes a step motor that includes a rotor, stator, coil, driver circuit that outputs a measurement drive signal to the coil, phase detecting circuit that detects a counter-electromotive current that is generated in the coil after the output of the measurement drive signal and determines whether a phase of the rotor is a desired phase based on the detected counter-electromotive current, and a control unit that, if the phase is the desired phase, controls the step motor by a first driving method in which the drive circuit outputs a first drive signal for rotating the rotor by one step, and, if not, controls the step motor by a second driving method different from the first driving method so as to restrict the rotation of the rotor.
    Type: Grant
    Filed: June 21, 2019
    Date of Patent: July 5, 2022
    Assignee: CITIZEN WATCH CO., LTD.
    Inventor: Yu Takyoh
  • Patent number: 11376865
    Abstract: A printer includes a print head portion for printing on a label paper, a feeding portion for feeding the label paper, a cutter portion for cutting the label paper, and a controller for controlling operations of the print head portion, the feeding portion, and the cutter portion. The label paper includes a bent portion that is generated in a portion right after unrolled from a label roll and changes in accordance with a label roll diameter. The controller is configured to control the feeding portion to feed the label paper by a constant length set in advance with respect to a predetermined label roll diameter so that a cutting operation by the cutter portion is performed at a position past a bent portion generated when the label roll diameter is larger than the predetermined diameter if the feeding operation for the label paper meets a predetermined condition set in advance.
    Type: Grant
    Filed: October 28, 2020
    Date of Patent: July 5, 2022
    Assignees: CITIZEN WATCH CO., LTD., CITIZEN SYSTEMS JAPAN CO.
    Inventor: Yukihisa Kato
  • Patent number: 11376697
    Abstract: The tool holding device includes: a casing including a first surface, a second surface opposed to the first surface, and a first projection and a second projection projecting opposite to the first surface from the second surface; a first tool holding part disposed on the first surface at a position opposed to the first projection; a second tool holding part disposed on the first surface at a position opposed to the second projection; a driving-force input unit disposed at the end of the first projection and rotated by driving force being inputted; a first shaft extending in an axial direction perpendicular to the first surface and the second surface, the driving-force input unit and the first tool holding part being disposed at one end and the other end of the first shaft, respectively; a second shaft extending in the axial direction and having one end housed in the second projection, the second tool holding part being disposed at the other end of the second shaft; and a rotation transmitting unit rotating th
    Type: Grant
    Filed: July 6, 2018
    Date of Patent: July 5, 2022
    Assignees: CITIZEN WATCH CO., LTD., CITIZEN MACHINERY CO., LTD.
    Inventor: Kyota Kotake
  • Patent number: 11375043
    Abstract: A program management system includes: a terminal device having a terminal processing unit capable of executing processing to create a computer program, and a terminal communication unit capable of transmitting the computer program created by the terminal processing unit to an outside; and an external device having an external device storage unit storing therein the computer program transmitted from the terminal device, and an external device processing unit capable of executing processing to give approval to the computer program stored in the external device storage unit. The external device storage unit stores therein appropriateness of approval of the computer program as first status information together with the computer program. The external device processing unit is capable of executing processing to manage the computer program based on the first status information.
    Type: Grant
    Filed: March 4, 2020
    Date of Patent: June 28, 2022
    Assignee: CITIZEN WATCH CO., LTD.
    Inventors: Ryutaro Uemura, Daisuke Matsuoh
  • Publication number: 20220161333
    Abstract: A machine tool (1) includes: a front spindle (10) having a front chuck (12); a rear spindle (20) having a rear chuck (22); a controller (50) configured to cause the rear chuck (22) to perform a fastening operation for fastening a work (W) fastened to the front chuck (12) to the rear chuck (22); and a detector (60) configured to detect an abnormality caused by the fastening operation by the rear chuck (22), based on measurement data associated with a vibration of at least one of the front chuck (12) and the rear chuck (22).
    Type: Application
    Filed: March 30, 2020
    Publication date: May 26, 2022
    Applicant: CITIZEN WATCH CO., LTD.
    Inventors: Atsushi INOUE, Masahiro MURAMATSU, Kenji NOGUCHI, Kohichi KAZAHARI
  • Publication number: 20220161339
    Abstract: A machine tool and a control device for the machine tool for shortening the machining time of a workpiece in a case where the relative and reciprocal vibration of workpiece holder and tool post in the radial direction of the workpiece is stopped during a period from an initial point until when the workpiece and the cutting tool come into contact with each other is provided.
    Type: Application
    Filed: May 22, 2020
    Publication date: May 26, 2022
    Applicants: CITIZEN WATCH CO., LTD., CITIZEN MACHINERY CO., LTD.
    Inventor: Kazuhiko SANNOMIYA
  • Patent number: 11342312
    Abstract: A light emitting device includes a first light emitting element, a second light emitting element, a first phosphor sheet containing a first phosphor and a third phosphor, and covering a top face of the first light emitting element, and a second phosphor sheet containing a second phosphor and a fourth phosphor, and covering a top face of the second light emitting element, wherein a peak wavelength of light which is wavelength-converted by the first phosphor or the third phosphor is equal to or less than a peak wavelength of light which is wavelength-converted by the second phosphor or the fourth phosphor.
    Type: Grant
    Filed: August 20, 2019
    Date of Patent: May 24, 2022
    Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.
    Inventors: Yuki Suto, Jo Kinosita
  • Patent number: 11338386
    Abstract: Disclosed is a friction welding method including: a heating step wherein, in relation to joining surfaces (S1, S2) defined by opposite end surfaces of a pair of materials (W1, W2), the pair of materials (W1, W2) are moved from a state in which their axes are unaligned with each other, in a direction for aligning the respective axes with each other, to a prescribed position where the joining surfaces (S1, S2) are brought into contact with each other and friction heated; and a pressure contacting step wherein the pair of materials are brought into pressure contact with each other. The method is characterized in that the heating step and the pressure contacting step are carried out while rotating each of the materials (W1, W2) at the same rotation speed in the same direction, as seen from one side in the axial direction.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: May 24, 2022
    Assignees: CITIZEN WATCH CO., LTD., CITIZEN MACHINERY CO., LTD.
    Inventor: Takaichi Nakaya
  • Patent number: 11338404
    Abstract: A machine tool and a control apparatus thereof include an amplitude control unit to control the amplitude of reciprocal vibration by a vibration unit. The amplitude control unit is configured to reduce the amplitude of the reciprocal vibration by the vibration unit as a cutting tool is fed in a feeding direction when the cutting tool reaches a predetermined cutting tool work stopping position on a workpiece in the feeding direction (Z-axis direction) to prevent the cutting tool from cutting the workpiece beyond the cutting tool work stopping position.
    Type: Grant
    Filed: September 14, 2015
    Date of Patent: May 24, 2022
    Assignees: CITIZEN WATCH CO., LTD., CITIZEN MACHINERY CO., LTD
    Inventors: Kazuhiko Sannomiya, Takaichi Nakaya
  • Patent number: D956704
    Type: Grant
    Filed: December 4, 2020
    Date of Patent: July 5, 2022
    Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.
    Inventor: Ryo Wakuda