Mitsubishi Electric Corporation

Mitsubishi Electric Research Laboratories, Inc.

Tokyo Institute of Technology

Dentsu Inc.

Daisuke Nakazawa

Daiki Fukui

Seiji Watanabe

Naoki Mori

Eiichi Saito

Takahide Hirai

Tomohiro Asamura

Yusuke Chikada

Mouhacine Benosman

Hiroyuki Murakami

Toshiaki Kato

Satoshi Yamasaki

Masahiro Ishikawa

Akio Iijima

Takahiro Ishii

Kentaro Yoshida

Daisuke Matsuura

Takeshi Matsumoto

Masayuki Kakio

Yuki Kishi

Yukio Takeda

Akihiro Nakaya

Hideki Shiozaki

Yusuke Sugahara

There is provided a conveying device that can support a car weight with a mechanism lighter in weight. A driving device () of a conveying device that lifts and lowers a loading-weight support along a rail () includes a wheel unit () and a link (). The wheel unit () drives to rotate a driving wheel () in contact with a guide surface () to lift and lower the loading-weight support. The link () includes a first joint () connected to the wheel unit () and a second joint () rotatably supported by the loading-weight support. The second joint () is arranged in a position further apart from the guide surface () than the first joint (), and above the first joint (). The link () is arranged such that a straight line connecting the first joint () and the second joint () is tilted smaller than 45 degrees.

Conveying device

A vibration damping device for reducing vibration of an elevator rope includes a displacement amplifier arranged around a region from a first portion of the elevator rope drawn and a second portion of the elevator rope drawn from an opposite side of one or more sheaves in parallel with the first portion. The displacement amplifier is configured to amplify a displacement of each of the first portion and the second portion of the elevator rope. The device also includes a limiting member that controls displacement amplification performed by the displacement amplifier such that the displacement of the first portion or the second portion amplified by the displacement amplifier does not become greater than a first displacement, which is a displacement of the elevator rope by which the elevator rope is not allowed to return to an equilibrium position of the vibration.

Vibration damping device and elevator apparatus

A break detection device includes a sensor, an abnormal variation detection unit (), a storage unit (), an arithmetic unit (), and a break determination unit (). The arithmetic unit () increases a determination score when the abnormal variation detection unit () detects occurrence of an abnormal variation when a car () passes a position stored in the storage unit (). The arithmetic unit () decreases the determination score when the abnormal variation detection unit () does not detect the occurrence of the abnormal variation when the car () passes the position. The break determination unit () determines whether or not a broken portion is present in a rope on the basis of the determination score.

Break detection device configured to determine whether or not a broken portion is present in a rope

A break detection device includes an extraction unit (), an extraction unit (), a detection unit (), and a determination unit (). The extraction unit () extracts, from an output signal from a sensor, a vibration component in a specific frequency band. The extraction unit () attenuates, from the vibration component extracted by the extraction unit (), a steady vibration component and a progressively increasing vibration component to extract a determination signal. The detection unit () detects, on the basis of the determination signal, occurrence of an abnormal variation in the output signal from the sensor. The determination unit () determines whether or not a rope has a broken portion.

Break detection device

An object of the present invention is to provide a vibration damping device including an instability preventing means, for efficiently suppressing amplification of vibration of a long structure, which is mechanically flexible, due to a resonance phenomenon. A vibration damping device () for reducing vibration of a long structure () includes a displacement amplifier () and limiting members (). The displacement amplifier () is arranged along a given position in the longitudinal direction of the structure (). The displacement amplifier () amplifies a displacement of the structure (). The limiting members () control displacement amplification performed by the displacement amplifier () such that the displacement of the structure () amplified by the displacement amplifier () does not become greater than a first displacement, the first displacement being a displacement of the structure () by which the structure () is not allowed to return to the equilibrium position of the vibration.

An object of the present invention is to provide a sway amount estimation system that can suppress a reduction in user convenience that would occur if the operation method is switched more than necessary. A sway amount estimation system () includes a sensing unit (), a judgment unit (), and an estimation unit (). The estimation unit () calculates an estimated value of the amount of sway of an elevator rope due to vibration caused by building sway based on the sway sensed by the sensing unit () and an estimation model incorporating the effect of the displacement amplification of the displacement amplifier (). The judgment unit () judges if the estimated value calculated by the estimation unit () is greater than a threshold for switching the operation method for the elevator apparatus ().

Sway amount estimation system and elevator apparatus

An object of the invention is to provide a vibration damping system that can avoid the occurrence of resonance of an elevator rope regardless of the vibration frequency of a vibration source. A vibration damping system () includes a displacement amplifier (), a calculation unit (), and a displacement amplification control unit (). The displacement amplifier () is arranged along a given position in the longitudinal direction of the elevator rope. The displacement amplifier () amplifies a displacement due to vibration of the elevator rope based on a variable amplification factor. The calculation unit () calculates the natural frequency of the elevator rope. The displacement amplification control unit () controls the displacement amplification of the displacement amplifier () based on the natural frequency calculated by the calculation unit () and a preset vibration frequency.

Vibration damping system and elevator apparatus

A control cable guide device for an elevator, which is to be mounted to a control cable suspended between a middle portion of a hoistway and a lower portion of a car, the control cable having a curved portion formed at a lower end position of the control cable, the control cable guide device including an arm to be suspended on the control cable at a position below the car in a pivotable manner. The arm is configured to be pushed upward by the curved portion when the car is caused to travel to a lowermost position within a normal traveling range, to thereby shift to a cable receiving position for receiving the control cable while being partially projected from the car in a horizontal direction.

Control cable guide device for elevator

A method for controlling an operation of an elevator system is discloses. The elevator system includes an elevator car moving within an elevator shaft and at least one elevator cable connected to the elevator car and the elevator shaft to carry electrical signals to the elevator car. The method determines a counter force on the elevator cable required to change a nominal shape of the elevator cable to an inverse shape of a current shape of the elevator cable caused by disturbance on the elevator system and applies the counter force to the elevator cable.

Controlling sway of elevator cable connected to elevator car

A method reduces a sway of an elevator rope supporting an elevator car by controlling a tension of the elevator rope. The tension is controlled using a movement of the elevator sheave according to a control law of the tension of the elevator rope between two points. The first point is associated with a contact of the elevator rope with the elevator sheave. The second point is associated with a contact of the elevator rope with the elevator car or a counterweight of the elevator car. The control law is a function of one or combination of a relative position, a relative velocity and a relative acceleration between the first and the second points.

Growing community of inventors

Tokyo, Japan

Daisuke Nakazawa