The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 21, 1998
Filed:
Jun. 24, 1996
Takeshi Hatanaka, Hudson, OH (US);
Norifumi Yamada, Hyogo, JP;
Ko Takakura, Hyogo, JP;
Tatsuya Tanaka, Hyogo, JP;
Yoshinori Kurokawa, Hyogo, JP;
Kabushiki Kaisha Kobe Seiko Sho, Kobe, JP;
Kobelco Stewart Bolling, Inc., Hudson, OH (US);
Abstract
An internal mixer and controller enables the phase difference and the speed ratio between two rotors to be changed without stopping the operation of the mixer. The internal mixer comprises: nonintermeshed first and second rotors disposed in a mixing chamber; first and second drive units; first and second phase measuring devices; first and second speed measuring devices; and a control unit for controlling the first and second drive units on the basis of signals from the first and second speed measuring devices and signals from the first and second phase measuring devices. The control unit controls the two rotors so as to synchronously rotate at the same speed on the basis of the signals from the speed measuring devices when the two rotors fixedly rotate at the same speed. When the phase difference between the two rotors is changed, the control unit calculates the phase difference from the signals from the phase measuring devices, compares the calculated phase difference with a set phase difference, and controls the second drive unit to change the speed of the second rotor, thereby changing the phase. When the phase difference is equal to the set phase difference, the control unit again controls the two rotors so as to synchronously rotate at the same speed on the basis of the signals from the speed measuring devices. When the two rotors are rotated at different speeds, the control unit controls the drive units so that the speed of each of the rotors is equal to the set speed, respectively, on the basis of the measured speed from speed measuring devices.