Motors: expansible chamber type – Working member position feedback to motive fluid control – Electrical input and feedback signal means
Patent
1988-08-05
1990-06-12
Look, Edward K.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Electrical input and feedback signal means
91165, 91404, 91459, 92 32, 92 33, 188161, 303115, 303116, F15B 1522
Patent
active
049323113
ABSTRACT:
A fluid apparatus includes a pneumatic cylinder having a main body, a piston, and a hollow rod. A ball screw shaft engaged with a ball nut fixed to the piston is rotatably and axially unmovably mounted in the cylinder and extends in the hollow rod. A magnetic brake for braking the ball screw shaft is fixed to an end portion of the main body of the cylinder. The number of revolutions of the ball screw shaft is detected and outputted in a signal form by a rotary encoder. A primary solenoid controlled valve reciprocates the piston by connecting a pressure source either to a first or second port of the cyliner, and secondary solenoid controlled valves connect a pressure source either to a first braking pressure port or to a second braking pressure port. A controller outputs a drive signal for controlling the primary solenoid controlled valve, and outputs a primary braking signal and a secondary braking signal according to a corresponding operational section as well as deviation of the number of revolutions of the ball screw shaft from a target value. The primary braking signal switches on or off the secondary solenoid controlled valves to apply back pressure to the piston, and the secondary braking signal is for operting the magentic brake.
REFERENCES:
patent: 2936737 (1955-07-01), Miller
patent: 3807810 (1974-04-01), Yarber
patent: 4075930 (1978-02-01), Millet
patent: 4106390 (1978-08-01), Kodaira et al.
patent: 4235156 (1980-11-01), Olsen
patent: 4545289 (1985-10-01), Weyer
patent: 4691813 (1987-09-01), Dittner et al.
patent: 4779513 (1988-10-01), Kimura
Mibu Kazuo
Ohi Yoshihide
Yamamoto Hiromitsu
Daihatsu Diesel Mfg. Co., Ltd.
Look Edward K.
Ryznic John
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