Motors: expansible chamber type – Working member position feedback to motive fluid control – Electrical input and feedback signal means
Reexamination Certificate
1999-04-28
2001-05-15
Ryznic, John E. (Department: 3745)
Motors: expansible chamber type
Working member position feedback to motive fluid control
Electrical input and feedback signal means
C251S129060
Reexamination Certificate
active
06230606
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a speed control apparatus for a cylinder, which makes it possible to automatically control the displacement speed of a piston by the aid of a speed controller for electrically controlling the flow rate of a pressure fluid introduced into and discharged from the cylinder.
2. Description of the Related Art
The pressure fluid-driven apparatus has been hitherto utilized extensively in order to drive and control the object by using a pressure fluid such as compressed air.
FIG. 13
illustrates such a pressure fluid-driven apparatus as exemplified by a speed control circuit for controlling the operation speed of a cylinder.
The speed control circuit
1
comprises the cylinder
2
, a selector valve
5
for making change over between a first port
4
a
and a second port
4
b
of the cylinder
2
for the pressure fluid supplied from a pressure fluid supply source
3
, and a pair of speed controllers
6
a
,
6
b
installed to the pair of ports
4
a
,
4
b
of the cylinder
2
respectively.
In this case, the pressure fluid, which is supplied from the pressure fluid supply source
3
, is supplied to the first or second port
4
a
(
4
b
) of the cylinder
2
via the first or second speed controller
6
a
(
6
b
) in accordance with the change over action of the selector valve
5
. A piston
7
, which is accommodated in a cylinder chamber of the cylinder
2
, makes reciprocating motion at a predetermined speed in accordance with the action of the pressure fluid. Each of the speed controllers
6
a
,
6
b
generally comprises a variable throttle valve
8
and a check valve
9
which are combined in parallel in an integrated manner. The variable throttle valve
8
has an unillustrated valve stem formed with a knob (not shown) exposed to the outside. When an operator grips the knob to rotate the valve stem in a predetermined direction, the spacing distance (throttle amount) between the valve stem and a seat section is adjusted. As a result, the passage area at the inside of the valve is changed depending on the spacing distance between the valve stem and the seat section, and thus the flow rate of the pressure fluid, which is supplied to or discharged from the cylinder
2
, is controlled.
However, the speed control circuit
1
for the cylinder
2
concerning the conventional technique involves the following drawback. That is, for example, every time when the operation speed of the cylinder
2
is changed due to any variation of the supply pressure of the pressure fluid supply source
3
or the like, the operator has to adjust the spacing distance (throttle amount) between the valve stem and the seat section by manually rotating the knob of each of the speed controllers
6
a
,
6
b
in the predetermined direction. The conventional speed control circuit
1
does not constructed such that the operation speed of the cylinder
2
is automatically controlled.
Further, for example, when the operation speed of the cylinder
2
is adjusted during the maintenance, the operator manually set or adjust the throttle amounts of a large number of speed controllers individually. Therefore, the conventional technique is complicated, and it involves such an inconvenience that the maintenance operation cannot be performed conveniently.
SUMMARY OF THE INVENTION
A general object of the present invention is to provide a speed control apparatus for a cylinder, which makes it possible to automatically control the operation speed of the cylinder.
A principal object of the present invention is to provide a speed control apparatus for a cylinder, which makes It possible to simplify the maintenance operation and collectively adjust the throttle amounts of a large number of speed controllers by means of remote control.
The above and other objects, features, and advantages of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings in which a preferred embodiment of the present invention is shown by way of illustrative example.
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patent: 4932311 (1990-06-01), Mibu et al.
patent: 4964612 (1990-10-01), Aggioni et al.
patent: 5347914 (1994-09-01), Kinoshita et al.
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patent: 5810325 (1998-09-01), Carr
patent: 5844390 (1998-12-01), Cameron
patent: 5893428 (1999-04-01), Fasse et al.
patent: 6062532 (2000-05-01), Gurich et al.
patent: 2908583 (1980-09-01), None
patent: 63-176801 (1988-07-01), None
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ryznic John E.
SMC Kabushiki Kaisha
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