Ishikawa Mitsusachi

Bio: Ishikawa Mitsusachi is an academic researcher. The author has contributed to research in topics: Drive shaft & Gas compressor. The author has an hindex of 4, co-authored 7 publications receiving 34 citations.

Ball balancer and centrifugal separator provided therewith

Abstract: PROBLEM TO BE SOLVED: To enlarge the correction extent of unbalanced mass and lessen the vibration of a rotor by setting the height of a cylinder in the axial direction to be within a specified range of the times as long as the ball diameter or longer and setting the height of the cylinder to be sufficient to arrange two rows of balls in zigzag arrangement at high speed rotation. SOLUTION: A female screw 28 to be fixed while the center being conformed to the rotation axis is installed in the center of a balancer body 20 and a balancer cover 26 having a ventilation hole 29 is fixed in the upper part of a stopping part 25 by stopping screws 27. The distance of the stopping part 25 in an upper part of the position 23 at which the diameter of a barrel shape cylinder 22 is the maximum from the bottom 24 in the lower side of the position 23 of the maximum diameter is made wide enough to arrange balls 21 in zigzag arrangement. In other words, the distance from the bottom 24 to the stopping part 25 is set to be at least about 1.4-2 times as long as the diameter of the balls 21. Consequently, the correction extent of unbalanced mass at the time of high speed rotation can be set wide and the vibration of a rotor can be suppressed and a centrifugal separator with a long life can be obtained.

Motor-driven tool

Abstract: PROBLEM TO BE SOLVED: To provide a motor-driven tool capable of preventing reduction of magnetic flux amount due to narrowing of a magnetic path, and reducing a manufacturing cost. SOLUTION: Resin moldings 27-1A and 27-1B are applied to two stator coil batches 27-1 and 27-2, respectively, the ends of the resin moldings 27-1A and 27-1B of the two stator coils 27-1 and 27-2 are coupled to each other with a resin extending portion 31. The resin extending portion 31 is made of the resin same as the resin forming the resin moldings 27-1A and 27-1B, and is integrally molded with the resin moldings 27-1A and 27-1B. Screw holes are formed on portion of the resin extending portion 31 equivalent to a substantially center position between the two stator coil batches 27-1 and 27-2. Screws 32 are each screwed into the screw holes, and the screws 32 each have a tip formed on a housing 10 and screwed in the screw holes. COPYRIGHT: (C)2009,JPO&INPIT

Blade attaching and detaching device of cutter

Abstract: PURPOSE:To provide structure to install a blade out of danger of falling off and easily without using any special purpose jig or tool for a balde attaching and detaching device of a cutter. CONSTITUTION:A blade support part 16 with which an overhang engagement part 14 of a blade 6 is engaged is formed in the inside of a holder main body 11 fastened on the top end of a plunger 3, a blade holder 5 is constituted by way of internally furnishing a bolt 17 with a groove moving vertically by revolution of a fastening nut 7 on its upper side and a one-direction regulation device to regulate the loosening direction of the fastening nut 7 by way of tightly winding a coil spring 8 around the fastening nut 7 so that the blade 6 is certainly held in the blade holder 5 without loosening.

Gear noises reducing device in gear driving equipment

Abstract: PURPOSE:To reduce gear noises in a gear driving equipment by a method wherein a damping body providing power to a power transmission system at all times is engaged on a suitable position in the power transmission system. CONSTITUTION:A shock force tends to separate a point of engagement of a smaller gear 2 with a larger gear 6, but a damping body 10 gives a damping force to a rotating shaft 5 of the larger gear 6 which is a driven gear, and prevents the point of the engagement from being separated. Further, when a gear driving device rotates in a normal state, the damping body can also restrain chatterings in which the separations and collisions of the engaging point are repeatedly caused by various errors of gears. That is, a collision at the engaging point of the smaller gear 2 with the larger gear 6 gives rise to a fluctuation in the larger gear 6 in the turning angular velocity within a range of an angle corresponding to back rash, but in this case changes in the turning angular velocity are supressed and an occurrence of chatterings are prevented by virtue of the damping force of the damping body 10.

Method for centrifugally separating liquid and apparatus therefor

Abstract: PROBLEM TO BE SOLVED: To separate a sample within a short time with high efficiency by housing a liquid in a rotor and rotating this rotor at a specific rotational speed by an ultrahigh speed rotary drive apparatus to apply specific acceleration to the rotor. SOLUTION: A cylindrical chamber 140 as a vacuum sealable rotary chamber is formed and a sample to be separated is inserted in a sample insertion hole provided to a rotor 160 housed in the rotary chamber to be set. After setting, the rotor 160 is rotated at an ultrahigh speed of at least 150000rpm by an ultrahigh speed motor 100 and, by centrifugal force generated by this rotation, centrifugal acceleration of at least 900000G is applied to the rotor to separate the sample. A bowl 135 is arranged in the chamber 140 so as to surround the rotor 160 and a heat exchanger composed or a thermo-module 143 is provided between the bowl 135 and a plate 141 and the supply of a current to the thermo- module 143 is controlled to perform the cooling/heating of the bowl and the rotor 160 is always held to predetermined temp.

Device and method for damping vibration of rotating shaft system

Abstract: A device for damping runout vibration of a rotating shaft system at least including a rotating shaft and a rotating body rotatably supported by the shaft. A ring (24) is provided outside a bearing (23) fitted on a rotating shaft with a clearance between the ring and an outer ring of the bearing. A vibration damping mechanism includes, in order to suppress runout vibration of a rotating shaft system from the radially outside of the ring (24), a blade spring (25) compressed by a preload and a stopper (26) for setting an operation limit of the blade spring.

Portable power tool

Abstract: A power tool is provided with a prime mover which causes the tool to rotate and a housing which houses the prime mover. In a back-end face that is positioned on an opposite side on the housing from a tool side, a back-end groove, into which a user can position his/her web between his/her thumb and forefinger, is formed. A pair of side-face grooves, into which the user can place the thumb and forefinger, are formed in both side faces of the housing. A depth changing portion is formed in at least one of the side-face grooves, such that the depth is reduced toward the back-end face of the housing. According to this structure, even when the housing is gripped directly from the back-end face, the user can easily draw up or raise the power tool.

Power tool with a housing including a guide portion for guiding cooling air along a switching circuit board

Abstract: An electric power tool includes a housing, a brushless motor, an output shaft, and a motor driver circuit. The housing defines an axial direction. The brushless motor is accommodated in the housing and having a drive shaft. The output shaft extends in a direction generally perpendicular to the drive shaft. The motor driver circuit is accommodated in the housing for driving the brushless motor. The housing has a cylindrical shape and has a part functioning as a grip portion.

Mobile body action analysis device

Abstract: PROBLEM TO BE SOLVED: To detect a mobile body action pattern and abnormal action of a mobile body with high accuracy with a small calculation amount without previously registering the mobile body action pattern for deciding the abnormal action. SOLUTION: This mobile body action analysis device has: a mobile body position time series data detection device 1 for detecting position time series data in each the mobile body about a plurality of the mobile bodies; a mobile body position time series data storage means 31 for previously storing the position time series data detected by the mobile body position time series data detection device 1; and a mobile body abnormal action detection means 32. The mobile body abnormal action detection means 32 models the position time series data by a hidden Markov model in each the mobile body, and collates prescribed similarity between the hidden Markov model corresponding to one mobile body and the hidden Markov model corresponding to the plurality of the other mobile bodies with a predetermined criterion to decide whether the action of the one mobile body is abnormal or not. COPYRIGHT: (C)2008,JPO&INPIT

Developer transporting device

Abstract: PURPOSE:To prevent a waste toner transporting pipe from hindering the attachment and detachment of a cleaning device and to prevent the spill of waste toners from the waste toner transporting pipe by turnably supporting a developer transporting device around the neighborhood of the cleaning device. CONSTITUTION:A shutter 40 is disconnected from a connecting part cooperatively with the removal of a cleaner unit 17 when the cleaner unit is removed from a body. The shutter is then energized by a spring 39 and is slid in an arrow mark A direction to cover the waste toner discharge port in the lower part at the left end of an auger pipe 37. A second auger 33 and connecting pipe 35 are then rotated 30 deg. in an arrow mark D direction around the connecting point of the connecting pipe 35 and the cleaner unit 17. The second auger 33 is rotated 90 deg. in an arrow mark E direction around the connecting point of the connecting pipe 35 and the connecting part 36 in such a manner that the axial line of the second auger 33 parallels with the cleaner unit 17. As a result, the second auger 33 is eventually aligned to the lower part of the cleaner unit 17 in parallel with the longitudinal direction thereof. The cleaner unit 17 is mounted by reverse procedures.