Nakajima, Chiyoda-Ku
Hajime Nakajima, Chiyoda-Ku JP
Patent application number | Description | Published |
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20110291646 | ORIGIN POSITION SIGNAL DETECTOR - An origin position signal detector comprising: a rotary or linear scale ( | 12-01-2011 |
20150015245 | MULTI-ROTATION ENCODER - A battery-less multi-rotation encoder including detection coils with the Barkhausen effect includes a rotation detection mechanism and a signal processing circuit. The detection coils generate voltage pulses with different positive and negative signs, and transmit them to the signal processing circuit, and the signal processing circuit includes a controller and an adder. The controller can set states of the detection coils to be High or Low and to maintain them at High or Low, based on the positive and negative signs of the respective voltage pulses and no voltage pulse being generated therefrom. The controller is configured to store the states of the respective detection coils in a memory. The adder can update a number of rotations according to the changes in the states of the respective detection coils. The signal processing circuit can determine the rotational angle of a rotational shaft within about 1/4 rotation unit. | 01-15-2015 |
20150054499 | MAGNETIC ROTATION-ANGLE DETECTOR - Provided is a magnetic rotation-angle detector that includes a disk-shaped magnet that is magnetized so as to change magnetic poles n times per rotation (where n is an integer equal to or larger than 1); a magnetic-body slit plate that is rotated together with the magnet, where a part having a high magnetic flux permeability and a part having a low magnetic flux permeability are alternately and repeatedly arranged thereon so as to change the magnetic flux permeability m times per rotation (where m is an integer equal to or larger than 2 and m>n); a magnetic sensor that detects magnetism from the magnet when the magnet has passed by through the magnetic-body slit plate; and a calculation unit that obtains the rotation angle of the magnet from the output from the magnetic sensor. | 02-26-2015 |
Ryo Nakajima, Chiyoda-Ku JP
Yasuo Nakajima, Chiyoda-Ku JP
Patent application number | Description | Published |
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20130315545 | OPTICAL FIBER - The present invention provides an optical fiber in which transmission loss is not easily increased when the optical fiber is dipped in water and then dried and also which has a solvent resistant property and a micro-bend resistant property. An optical fiber according to one embodiment of the present invention is an optical fiber in which at least two layers of coating resin coat the circumference of a glass optical fiber. When a Yang's modulus of the first coating layer of the coating resin is defined by PY (MPa) and an elution rate of the coating resin after dipping in 60° C. hot water for 168 hours is defined by E (mass·%), a formula of 1.8≦E≦8.61×PY+1.40 is satisfied. | 11-28-2013 |
Yoji Nakajima, Chiyoda-Ku JP
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20130193113 | WIRE ELECTRIC DISCHARGE MACHINE AND WIRE ELECTRODE REMOVAL DEVICE - To provide a wire electrode removal device of a wire electric discharge machine, the wire electrode removal device including a wire-electrode guide unit that guides an end on a cut point side of a wire electrode cut by wire-electrode cut devices to outside of a running path, a rewind shaft that pressure-fixes the wire electrode on the cut point side guided by the wire-electrode guide unit with an end face thereof and rewinds the wire electrode on a columnar member having angular portions with subsequent rotational driving thereof, a rewind-shaft drive unit that drives the rewind shaft to perform pressure fixing or pressure releasing of the wire electrode with the rewind shaft, a scraper member that removes a wound wire electrode from the columnar member at a time of pressure releasing of the rewind shaft by the rewind-shaft drive unit, and a collection member that collects the removed wire electrode. | 08-01-2013 |
20140305908 | WIRE ASPIRATION DEVICE AND WIRE RECOVERY DEVICE - A wire aspiration device includes a first member having a first curved surface with a projected portion that is in close contact with peripheral surfaces of first and second recovery rollers on one side, a second member having a second curved surface with a projected portion that is in close contact with the peripheral surfaces of the first and second recovery rollers on the other side, and a third member having a through hole formed in a central portion thereof to cause the ejected wire electrode to run in the wire-electrode recovering direction and coupling the first and second members to form two grooves between the first and second curved surfaces to be in contact with the through hole, wherein a fluid spout for spouting a fluid into the through hole in the recovering direction is formed in any of the first, second, and third members. | 10-16-2014 |
20140319101 | WIRE ELECTRIC-DISCHARGE MACHINING DEVICE AND WIRE-ELECTRODE REMOVING DEVICE - A wire-electrode removing device in a wire electric-discharge machining device includes a wire-electrode guide unit that has a through hole into which a wire electrode in a vertical direction is inserted at the time of electric-discharge machining using the wire electrode and guides an end on a cut point side of the wire electrode outside a running path, with the cut wire electrode arranged in the through hole, by rotationally moving about a wire-electrode guide shaft in an operation of removal of the wire electrode cut by wire-electrode cutting devices; a winding shaft unit that winds and removes the wire electrode on the cut point side guided by the wire-electrode guide unit; and a collection member that collects the wound wire electrode. | 10-30-2014 |
Yooji Nakajima, Chiyoda-Ku JP
Patent application number | Description | Published |
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20100219164 | FLUID-QUALITY CONTROL METHOD, FLUID-QUALITY CONTROL APPARATUS, AND ELECTRIC-DISCHARGE MACHINING APPARATUS EMPLOYING THE SAME - Target fluid is made into electrolyte solution when measured fluid-quality value is lower than a first condition value, by substituting an impurity anion contained in the target fluid with a predetermined anion and substituting an impurity cation contained in the target fluid with a predetermined cation, and purified when the fluid-quality value is higher than a second condition value. The above procedures are repeated, so that the fluid-quality value of the target fluid falls within a predetermined range, to make the target fluid into electrolyte solution with a correlation between pH and conductivity. | 09-02-2010 |