Information
-
Patent Grant
-
6397876
-
Patent Number
6,397,876
-
Date Filed
Tuesday, February 6, 200123 years ago
-
Date Issued
Tuesday, June 4, 200222 years ago
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Inventors
-
Original Assignees
-
Examiners
Agents
-
CPC
-
US Classifications
Field of Search
US
- 137 14
- 137 56522
- 137 56523
- 294 642
- 417 187
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International Classifications
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Abstract
A method for generating and controlling the source of vacuum produced from a source of pressurized air in communication with at least one vacuum responsive device wherein the present invention maintains the operating conditions of the system during the loss and resumption of power. The present invention provides at least one venturi for creating a vacuum through a flow of pressurized air. The present invention selectively provides a flow of pressurized air from a pressurized air source to the vacuum creating means and selectively provides a flow of pressurized air to the vacuum responsive device. A last function valve communicates with the selective providing of pressurized air to maintain the operating condition of the vacuum responsive device during the loss and resumption of power.
Description
FIELD OF THE INVENTION
The present invention relates to a method for generating and controlling the source of vacuum from a source of pressurized air to a vacuum responsive device, and more particularly, a method for maintaining the operating condition of a vacuum responsive device during the loss and resumption of power.
BACKGROUND OF THE INVENTION
Vacuum operated work holding devices are commonly employed as workpiece gripping elements to engage and transport workpieces in a manufacturing operation, to load and unload sheet metal parts into and from a die, or to carry a part, such as an automobile windshield, to the vehicle in which it is to be installed. Such vacuum operated work holding devices employ a control apparatus which uses a venturi passageway and a body which is connected to a source of pressurized air. Airflow through the venturi passageway induces a sub-atmospheric pressure in the throat of the venturi and in a passage connecting the venturi throat to the interior of a vacuum operated work holding device, such as a vacuum cup. This sub-atmospheric pressure induces vacuum within the cup when the cup engages a workpiece surface.
Further advancements of the vacuum control apparatus have led to designs which generate and control a source of vacuum produced from a source of pressurized air that is positioned remote from the vacuum operated work holding device, thereby allowing for a single remote control system to control a plurality of vacuum operated work holding devices. These designs provide the distinct advantage of allowing a plurality of vacuum operated work holding devices to be attached to a single controller. This provides further flexibility as the vacuum flow rate available to the vacuum operated work holding devices can be increased by increasing the number of venturis engaged in the sub-atmospheric pressure generating system.
Due to the fact that these vacuum operated work holding devices are commonly utilized in an industrial environment, the power supplied to these devices is often interrupted. For example, such devices are often provided with emergency stops wherein an operator of the device may actuate the emergency stop to cut the power to the device. When this occurs, it is desirous to have the vacuum operated work holding device, such as a vacuum cup, maintain its vacuum so that any workpiece that is being held by the vacuum cup will be maintained and held by the vacuum cup. On the other hand, if the vacuum cups are not engaging a workpiece when the power is disengaged, then it is desirous to have the air supply disengage so that pressurized air is conserved.
Possible solutions to these problems include electrically wiring the vacuum operated work holding device prior to the emergency stop so that power will be maintained to the vacuum control apparatus even after power has been disengaged to the remainder of the system. This solution is typically not desirable since most operators do not wish for any power to be linked to the system in an emergency stop condition.
Another possible solution is to add a power failure override circuit to the vacuum operated work holding device so that the vacuum generating device runs at a maximum vacuum condition when the power is disengaged. The disadvantage with this system is that the vacuum will continue to run regardless of whether the vacuum cups are currently engaging a workpiece. This of course, fails to conserve pressurized air and fails to reduce the level of unnecessary noise caused by the continuous blowing of pressurized air.
It is desirable to provide a method that will maintain the operating condition of a vacuum responsive device during the loss and resumption of power.
SUMMARY OF THE INVENTION
The present invention overcomes the above-noted disadvantages by providing an improved method for generating and controlling the source of vacuum produced from a source of pressurized air in communication with at least one vacuum responsive device wherein the method maintains the operating conditions of the system during the loss and resumption of power. The method includes selectively providing a flow of pressurized air from the pressurized air source to a vacuum creating device. Vacuum is created by passing pressurized air through the vacuum creating device and communicating the vacuum to the vacuum responsive device. Vacuum is negated by selectively providing a flow of pressurized air from the pressurized air source to the vacuum responsive device. The method also includes maintaining the operating condition of the vacuum responsive device by selectively providing pressurized air to the vacuum creating device during the loss and resumption of power.
Vacuum is created by directing a flow of pressurized air through at least one venturi. More venturis may be added to increase the amount of vacuum applied to a vacuum responsive device or to increase the number of vacuum responsive devices utilized.
Pressurized air is selectively provided to the vacuum creating device by actuating a vacuum solenoid operated valve between an open position, wherein pressurized air flows through the vacuum solenoid operated valve from the pressurized air source, and a closed position, wherein pressurized air from the pressurized air source is blocked from flowing through the vacuum solenoid operated valve. An external power solenoid operated valve is actuated in a first position, wherein pressurized air from the vacuum solenoid operated valve flows through the external power solenoid operated valve, and deactuated in a second position, wherein pressurized air from the vacuum solenoid operated valve is blocked from passing through the external power solenoid operated valve. A vacuum pilot poppet valve is moveable between an open position, wherein pressurized air from the pressurized air source flows through the vacuum pilot poppet valve, and a closed position, wherein pressurized air is blocked from flowing through the vacuum pilot poppet valve. A vacuum poppet valve communicates with the vacuum pilot poppet valve and is communicatable with the pressurized air source. The vacuum poppet valve is movable between an open position, wherein pressurized air from the pressurized air source flows through the vacuum poppet valve to the vacuum responsive device, and a closed position, wherein pressurized air is blocked from flowing through the vacuum poppet valve.
Pressurized air is selectively provided to the vacuum responsive device by actuating a blow-off solenoid operated valve between an open position, wherein pressurized air flows through the blow-off solenoid operated valve from the pressurized air source, and a closed position, wherein pressurized air is blocked from passing through the blow-off solenoid operated valve. A blow-off poppet valve is movable between an open position, wherein pressurized air from the pressurized air source flows through the blow-off poppet valve to the vacuum responsive device, and a closed position, wherein pressurized air is blocked from flowing through the blow-off poppet valve.
Maintaining the operating condition of the vacuum responsive device includes moving a last function valve between an open position, wherein pressurized air from the vacuum solenoid operated valve moves the last function valve to an open position so that pressurized air from the pressurized air source may flow to the external power solenoid operated valve, and a closed position, wherein pressurized air from the blow-off solenoid operated valve moves the last function valve to a closed position so that pressurized air from the pressurized air source cannot flow through the last function valve. When power is lost to the solenoid operated valves and the vacuum responsive device is in the vacuum mode, the external power solenoid operated valve is deactuated to the second position, wherein pressurized air from the last function valve flows through the external power solenoid operated valve and is ultimately routed to the venturis to maintain vacuum during the loss and resumption of power. If power is lost to the solenoids during a blow-off condition, the last function valve remains in the closed position thereby preventing pressurized air from flowing to the vacuum generating means during the loss and resumption of power.
Sensing the level of vacuum being supplied to the vacuum responsive device is also provided. The level of vacuum is determined and sent to a controller after the loss and resumption of power. If the vacuum level is above a predetermined level, then the controller actuates the first valving means into a power-on vacuum mode. If the vacuum level is below the predetermined level, then the controller remains idle.
BRIEF DESCRIPTION OG THE DRAWINGS
The present invention will be more fully understood by reference to the following detailed description of the preferred embodiments of the present invention when read in conjunction with the accompanying drawings, in which like reference numerals refer to like parts throughout the various views.
FIG. 1
is a prior art schematic diagram for operating a vacuum responsive devices.
FIG. 2
is a schematic diagram of the present invention shown in the power-on vacuum mode.
FIG. 3
is a schematic diagram of the present invention shown in the power-off vacuum mode.
FIG. 4
is a schematic diagram of the present invention shown in the power-on blow-off mode.
FIG. 5
is a schematic diagram of the present invention shown in the power-off blow-off mode.
FIG. 6
is a flow diagram showing the control logic of the controller of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1
shows a prior art schematic diagram of the method
11
. The prior art schematic diagram in
FIG. 1
is shown in a power-off position and is utilized with conventional manifolds, valving, and vacuum cup hardware. As seen in
FIG. 1
, a pressurized air source
12
provides a supply line of pressurized air throughout the prior art vacuum control apparatus
11
. The pressurized air supply
12
is in communication with a vacuum valve train
14
and a blow-off valve train
16
. The vacuum valve train
14
selectively provides a pressurized air to a plurality of venturis
26
to create a vacuum. The vacuun is supplied to a vacuum responsive device
32
for engaging a workpiece (not shown). The blow-off valve train
16
selectively provides pressurized air to the vacuum responsive device
32
to release the workpiece from the vacuum responsive device
32
. (It should be noted that the drafter has referred throughout this document to a valve as being “open” when pressurized air can flow through the valve, and as being “closed” when pressurized air is blocked from flowing through the valve. This may be inconsistent with the nomenclature utilized in the pneumatics art.)
To provide pressurized air to the venturis
26
, the vacuum valve train
14
includes a vacuum solenoid operated valve
18
that is electrically actuatable between an open position and a closed position. When the vacuum solenoid operated valve
18
is actuated in the open position, a flow of pressurized air from the pressurized air supply
12
is allowed to flow through the vacuum solenoid operated valve
18
. When the vacuum solenoid operated valve
18
is deactuated (as shown in FIG.
1
), the vacuum solenoid operated valve
18
is closed, and pressurized air is blocked from passing through the vacuum solenoid operated valve
18
. (It should be noted that the drafter has referred throughout this document to a valve as being “open” when pressurized air can flow through the valve, and as being “closed” when pressurized air is blocked from flowing through the valve. This may be inconsistent with the nomenclature utilized in the pneumatics art.)
When the vacuum solenoid operated valve
18
is in the open position, the flow of pressurized air from the pressurized air source
12
is directed to a vacuum pilot poppet valve
20
. The vacuum pilot poppet valve
20
is an air-actuated valve that may be moved between an open and closed position. When the vacuum pilot poppet valve
20
receives a flow of pressurized air from the vacuum solenoid operated valve
18
, the vacuum pilot poppet valve
20
moves to the open position, and pressurized air from the pressurized air source
12
flows through the vacuum pilot poppet valve
20
. The vacuum pilot poppet valve
20
is also in communication with the pressurized air source
12
such that if the vacuum pilot poppet valve
20
does not receive a flow of pressurized air from the vacuum solenoid operated valve
18
, then pressurized air from the pressurized air source
12
moves the vacuum pilot poppet valve
20
to the closed position (as shown in FIG.
1
), and pressurized air from the pressurized air source
12
is blocked from passing through the vacuum pilot poppet valve
20
.
To further direct pressurized air to the vacuum responsive device
32
, the vacuum pilot poppet valve
20
communicates with a vacuum poppet valve
24
. The vacuum poppet valve
24
is an air actuated valve that is movable between an open position and a closed position. The vacuum poppet valve
24
is moved to the open position by a flow of pressurized air received from the vacuum pilot poppet valve
20
. When the vacuum poppet valve
24
is in the open position, pressurized air from the pressurized air source
12
is allowed to flow to the venturis
26
. When a flow of pressurized air is not provided to the vacuum poppet valve
24
from the vacuum pilot poppet valve
20
, then a flow of pressurized air from the pressurized air source
12
moves the vacuum poppet valve
24
to a closed position, (as shown in
FIG. 1
) and pressurized air from the pressurized air source
12
is blocked from flowing through the vacuum poppet valve
24
to the venturis
26
.
The venturis
26
are conventional in that they generate vacuum through a flow of pressurized air passing over a small inlet or orifice. Once the pressurized air passes through the venturis
26
, the pressurized air exhausts to an exhaust port
25
provided downstream of the venturis
26
. Check valves
28
are connected in series with the vacuum port
30
of each venturi
26
to isolate each venturi
26
from the other venturis in the stack. When vacuum is created through the use of pressurized air flowing through the venturis
26
, a check ball or flapper
27
in the check valve
28
lifts to open the check valve
28
thus allowing vacuum to flow to the vacuum port
30
. When the flow of pressurized air ceases, the ball or flapper
27
in the check valve
28
seats on a valve seat
29
to close the check valve
28
and prevent atmospheric pressure from entering the vacuum supply line through the venturis
26
. The supply line leading from the venturis
26
provides vacuum to a vacuum port
30
which is in communication with the vacuum responsive device
32
.
To release a workpiece from the vacuum responsive device
32
, the vacuum control apparatus
11
provides the blow-off valve train
16
. The blow-off valve train
16
includes a blow-off solenoid operated valve
34
which is electrically actuatable between an open position and a closed position. The blow-off solenoid operated valve
34
communicates with the pressurized air source
12
so that when the blow-off solenoid operated valve
34
is actuated into the open position, pressurized air from the pressurized air source
12
flows through the blow-off solenoid operated valve
34
. When the blow-off solenoid operated valve
34
is deactuated, the blow-off solenoid operated valve
34
moves to a closed position to block the flow of pressurized air through the blow-off solenoid actuated valve
34
.
When the blow-off solenoid actuated valve
34
is actuated in the open position and pressurized air is allowed to flow through the blow-off solenoid operated valve
34
, the pressurized air is directed to a blow-off poppet valve
36
. The blow-off poppet valve
36
is an air actuated valve that is movable between an open position and a closed position. When the blow-off poppet valve
36
receives a flow of pressurized air from the blow-off solenoid operated valve
34
, the blow-off poppet valve
36
moves to the open position, and pressurized air from the pressurized air source
12
flows through the blow-off poppet valve
36
to the vacuum port
30
. When there is no flow of pressurized air to the blow-off poppet valve
36
from the blow-off solenoid operated valve
34
, a flow of pressurized air from the pressurized air source
12
moves the blow-off poppet valve
36
to the closed position, and pressurized air is prevented from passing through the blow-off poppet valve
36
to the vacuum port
30
. The prior art vacuum control apparatus
11
also provides a vacuum sensor
38
in communication with the vacuum port
30
to provide an indication as to the level of vacuum being supplied to the vacuum port
30
.
FIGS. 2-6
show the schematic diagrams and the flow chart utilized in the method
10
of the present invention. The schematic diagrams are utilized with conventional manifolds, valving, and vacuum cup hardware. The controller functions are incorporated by reference in U.S. Pat. No. 5,201,560. The method
10
of the present invention is unique and novel over the prior art method
11
in that the method
10
maintains the operating condition of the vacuum responsive device
32
during the loss and resumption of power. In so doing, the present invention utilizes the pressurized air source
12
to provide supply lines
13
of pressurized air to the vacuum control apparatus
10
. A flow of pressurized air from said pressurized air source
12
is selectively provided to create and supply vacuum to the vacuum responsive device
32
. The vacuum responsive device
32
utilizes the vacuum to engage and hold a workpiece (not shown). A flow of pressurized air from the pressurized air source
12
is selectively provided to the vacuum responsive device
32
to release the workpiece from the vacuum responsive device
32
. The vacuum responsive device
32
may include vacuum cups or any other work holding device that may operate through the use of vacuum.
To selectively supply pressurized air to the venturis
26
create vacuum, a vacuum valve train
42
includes the vacuum solenoid operated valve
18
in communication with the pressurized air source
12
. The vacuum solenoid operated valve
18
is electrically actuated between an open position (as shown in FIG.
2
), wherein a flow of pressurized air from the pressurized air source
12
is allowed to flow through the vacuum solenoid operated valve
18
, and a closed position (as shown in FIGS.
3
-
5
), wherein pressurized air from the pressurized air source
12
is blocked from passing through the vacuum solenoid operated valve
18
. It should be noted that the loss of electrical power to the vacuum solenoid operated valve
18
will cause deactuation of the valve
18
into the closed position.
In order to ensure that the flow of pressurized air is maintained during the loss and resumption of electrical power (as will be described in detail later), an external power solenoid operated valve
48
is placed in communication with the vacuum solenoid operated valve
18
. The external power solenoid operated valve
48
is electrically actuated and maintained in a first position (as shown in
FIGS. 2 and 4
) as long as electrical power is being supplied to the external power solenoid operated valve
48
. When the external power solenoid operated valve
48
is in the first position, pressurized air from the vacuum solenoid operated valve
18
is allowed to flow through the external power solenoid operated valve
48
(as shown in FIG.
2
). When power is lost to the external power solenoid operated valve
48
, the external power operated solenoid valve
48
moves to a second position thereby blocking the flow of pressurized air from the vacuum solenoid operated valve
18
(as shown in
FIGS. 3 and 5
.) However, when power is lost, pressurized air from the vacuum solenoid operated valve
18
no longer flows to the external power solenoid actuated valve
48
because the loss of power deactuates the vacuum solenoid operated valve
18
into its closed position.
When the external power solenoid operated valve
48
is actuated in the first position (as shown in FIGS.
2
and
4
), pressurized air flows through the external power solenoid operated valve
48
to the vacuum pilot poppet valve
20
. The vacuum pilot poppet valve
20
is an air actuated valve that moves between an open position and a closed position. Pressurized air from the external power solenoid operated valve
48
moves the vacuum pilot poppet valve
20
to an open position and allows for pressurized air from the pressurized air source
12
to flow through the vacuum pilot poppet valve
20
. The vacuum pilot poppet valve
20
is also in communication with the pressurized air source
12
so that when pressurized air is not provided from the external power solenoid operated valve
48
to the vacuum pilot poppet valve
20
, the vacuum pilot poppet valve
20
moves to a closed or second position (as shown in FIGS.
4
-
5
). When the vacuum pilot poppet valve
20
is in its second position, the vacuum pilot poppet valve
20
is vented to atmospheric pressure
49
.
The vacuum pilot poppet valve
20
is designed so that a plurality of vacuum modules
22
may be connected and controlled by a common vacuum pilot poppet valve
20
. As seen in
FIGS. 2-5
, the vacuum pilot poppet valve
20
communicates with the vacuum module
22
which includes the vacuum poppet valve
24
. The vacuum poppet valve
24
is an air actuated valve that selectively moves between an open position and a closed position to allow the flow of pressusrized air to the vacuum creating means
44
. When the vacuum poppet valve
24
receives a flow of pressurized air from the vacuum pilot poppet valve
20
, the vacuum poppet valve
24
moves to an open position to allow pressurized air from the pressurized air source
12
to flow through to the vacuum creating means
44
(as shown in FIGS.
2
-
3
). When pressurized air is not supplied from the vacuum pilot poppet valve
20
to the vacuum poppet valve
24
, pressurized air from the pressurized air source
12
communicates with the vacuum poppet valve
24
to move the vacuum poppet valve
24
to the closed position and block the flow of pressurized air to the vacuum creating means
44
(as shown in FIGS.
4
-
5
).
Creating vacuum is similar to that discussed in the prior art in that it utilizes at least one venturi
26
to generate vacuum through the flow of pressurized air. Preferably, four venturis
26
are utilized, as shown in
FIGS. 2-5
. Check valves
28
, having the check balls or flappers
27
and valve seats
29
, are utilized to prevent the flow of atmospheric pressure into the vacuum supply line when the flow of pressurized air ceases to flow through the venturis
26
. The vacuum that is created from the venturis
26
flows through a supply line to the vacuum port
30
, and the pressurized air that flows through the venturis
26
is exhausted to the exhaust port
25
.
In order to release the workpiece from the vacuum responsive device
32
, the present invention provides the blow-off valve train
16
which selectively provides a flow of pressurized air to the vacuum responsive device
32
so that the vacuum between the vacuum responsive device
32
and the workpiece is lost, thereby releasing the workpiece from the vacuum responsive device
32
. To selectively control the flow of pressurized air to the vacuum responsive device
32
, the blow-off valve train
16
includes the blow-off solenoid operated valve
34
which is electrically actuatable between an open position and a closed position. The blow-off solenoid operated valve
34
communicates with the pressurized air source
12
such that when the blow-off solenoid operated valve
34
is electrically actuated into the open position (as shown in FIG.
4
), pressurized air from the pressurized air source
12
flows through the blow-off solenoid operated valve
34
. When the blow-off solenoid operated valve
34
is deactuated into the closed position (as shown in
FIGS. 2
,
3
, and
5
), pressurized air from the pressurized air source
12
is blocked from passing through the blow-off solenoid operated valve
34
. Loss of electrical power to the blow-off solenoid operated valve
34
will cause the valve
34
to deactuate into the closed position.
When the blow-off solenoid operated valve
34
has been actuated to the open position, pressurized air flows through the blow-off solenoid operated valve
34
to the blow-off poppet valve
36
. The blow-off poppet valve
36
is an air actuated valve that selectively directs pressurized air to the vacuum responsive device
32
by moving between an open position and a closed position. When the blow-off poppet valve
36
receives a flow of pressurized air from the blow-off solenoid operated valve
34
, the flow of pressurized air moves the blow-off poppet valve
36
to an open position, wherein pressurized air from the pressurized air source
12
flows through the blow-off poppet valve
36
to the vacuum responsive device
32
(as shown in FIG.
4
). When the blow-off poppet valve
36
does not receive a flow of pressurized air from the blow-off solenoid operated valve
34
, pressurized air from the pressurized air source
12
moves the blow-off poppet valve
36
to a closed position to block the flow of pressurized air to the vacuum port
30
(as shown in
FIGS. 2-3
and
5
).
In order to maintain the operating condition of the vacuum responsive device
32
during the loss and resumption of power to the solenoid operated valves
18
,
34
,
48
, the present invention maintains the operating condition of the vacuum responsive device
32
by selectively providing vacuum to the vacuum responsive device. To maintain the operating condition of the vacuum responsive device, a last function valve
50
communicates with the vacuum valve train
42
, the blow-off valve train
16
, and the pressurized air source
12
. The last function valve
50
is an air actuated valve that selectively controls the flow of pressurized air to the vacuum creating means
44
by moving between an open position and a closed position. The last function valve
50
communicates with the vacuum solenoid operated valve
18
such that when the last function valve
50
receives the flow of pressurized air from the vacuum solenoid operated valve
18
, the last function valve
50
moves to the open position to allow for pressurized air from the pressurized air source
12
to flow to the external power solenoid operated valve
48
(as shown in FIGS.
2
-
3
). The last function valve
50
is also in communication with the blow-off solenoid operated valve
34
such that when the blow-off solenoid operated valve
34
is actuated in the open position to communicate pressurized air to the last function valve
50
, the last function valve
50
moves to the closed position, wherein the flow of pressurized air is blocked from passing through the last function valve
50
(as shown in FIGS.
4
-
5
). It should be noted that the vacuum solenoid operated valve
18
and the blow-off solenoid operated valve
34
are held in communication such that only one of these solenoid operated valves
18
,
34
may be actuated in the open position at the same time.
To maintain the original operating condition after the loss and resumption of power, the present invention senses the level of vacuum through the use of a vacuum sensor
38
. The vacuum sensor
38
communicates with the vacuum responsive device
32
, and a controller
55
communicates with the vacuum sensor
38
. As seen in block
58
of
FIG. 6
, the vacuum sensor
38
indicates the level of vacuum being provided to the vacuum responsive device
32
. After the resumption of power to the controller
55
and the vacuum sensor
38
, the vacuum sensor
38
sends a signal to the controller
55
indicating the level of vacuum at the vacuum port
30
. The controller
55
provides software which interprets whether the level of vacuum at the vacuum port
30
is above or below a level of vacuum which is maintained when engaging and holding a workpiece by the vacuum responsive device
32
, as shown in decision block
60
of FIG.
6
. If the level of vacuum is above this predetermined level, then the controller
55
actuates the vacuum solenoid operated valve
18
into the open position so that the original pneumatic circuitry, established prior to the loss of power, is reestablished, as shown in block
62
of FIG.
6
. If the vacuum level is below the predetermined level, then the controller
55
interprets the signal as meaning that no part is engaged by the vacuum responsive device
32
, and therefore, the controller
55
remains idle until an input signal is provided, as shown in block
64
of FIG.
6
.
In operation, the present invention may start in a vacuum mode with electric power on, as shown in FIG.
2
. The vacuum solenoid operated valve
18
is electrically actuated to an open position wherein pressurized air from the pressurized air source
12
passes through the vacuum solenoid operated valve
18
. Pressurized air is then directed to and through the open actuated external power solenoid operated valve
48
to the open vacuum pilot poppet valve
20
. Pressurized air from the pressurized air source
12
flows through the vacuum pilot poppet valve
20
to the open vacuum poppet valve
24
, wherein pressurized air flows across the venturis
26
to produce vacuum to the vacuum port
30
. A flow of pressurized air also flows from the vacuum solenoid operated valve
18
to the last function valve
50
. The last function valve
50
opens and allows pressurized air to flow to a closed port of the external power solenoid operated valve
48
. It should be noted that when the vacuum solenoid operated valve
18
is actuated, the blow-off solenoid operated valve
34
is deactuated in the closed position.
When electrical power is lost to the solenoid operated valves
18
,
34
,
48
while in the vacuum mode, the vacuum control apparatus
10
reflects the pneumatic circuitry shown in FIG.
3
. Pressurized air from the pressurized air source
12
is blocked by the vacuum solenoid operated valve
18
as the loss of power causes the vacuum solenoid operated valve
18
to deactuate into the closed position. The external power solenoid operated valve
48
is also deactuated into its second position. The second position of the external power solenoid operated valve
48
allows for the flow of pressurized air from the last function valve
50
to flow through the external power solenoid operated valve
48
to the vacuum pilot poppet valve
20
. The flow of pressurized air maintains the vacuum pilot poppet valve
20
in the open position so that pressurized air from the pressurized air source
12
continues to flow to the vacuum poppet valve
24
. The vacuum poppet valve
24
is maintained in the open position, and pressurized air from the pressurized air source
12
continues to flow to the venturis
26
so as to generate vacuum to the vacuum responsive device
32
.
FIG. 4
shows the present invention in a blow-off mode with the electric power on. The blow-off solenoid operated valve
34
is actuated in its open position wherein pressurized air from the pressurized air source
12
flows through the blow-off solenoid operated valve
34
. The pressurized air flows to the blow-off poppet valve
36
wherein the blow-off poppet valve
36
moves to its open position. Pressurized air from the pressurized air source
12
flows through the blow-off poppet valve
36
to the vacuum responsive device
32
. In addition, pressurized air from the blow-off solenoid operated valve
34
flows to the last function valve
50
and moves the last function valve
50
to the closed position. This prevents the flow of pressurized air through the last function valve
50
to the external power solenoid operated valve
48
. It should also be noted that when the blow-off solenoid operated valve
34
is actuated, the vacuum solenoid operated valve
18
must be deactuated in the blow-off mode thereby preventing the flow of pressurized air through the vacuum solenoid operated valve
18
.
FIG. 5
shows the present invention in a blow-off mode with the electric power off. The blow-off solenoid operated valve
34
is deactuated into the closed position thereby blocking the flow of pressurized air through the blow-off solenoid operated valve
34
. Since there is no flow of pressurized air from the blow-off solenoid operated valve
34
to the blow-off poppet valve
36
, the flow of pressurized air from the pressurized air source
12
moves the blow-off poppet valve
36
to the closed position, thus preventing the flow of pressurized air to the vacuum responsive device
32
. Since there is no flow of pressurized air from either the blow-off solenoid operated valve
34
or the vacuum solenoid operated valve
18
to the last function valve
50
, the last function valve
50
remains in the closed position and prevents the flow of pressurized air to the external power solenoid operated valve
48
.
Although pressurized air is provided to the vacuum responsive device
32
in the blow-off mode prior to the loss of power, there is no need for the pressurized air to resume flowing to the vacuum responsive device
32
when the power is restored since the workpiece would have already been released from the vacuum responsive device
32
upon being actuated in the blow-off mode. This conserves pressurized air from needlessly flowing through the vacuum responsive device
32
when the workpiece has already been released from the vacuum responsive device
32
.
After the loss and resumption of power to the present invention, the vacuum sensor
38
senses the level of vacuum being supplied to the vacuum responsive device
32
. The vacuum sensor
38
sends a signal to the controller
55
indicating the level of vacuum being supplied to the vacuum responsive device
32
. If the level of vacuum is above the predetermined level, which indicates that a workpiece is being held by the vacuum responsive device
32
, then the vacuum mode is on, and the controller
55
actuates the vacuum solenoid operated valve
18
to the open position to reflect the diagram shown in FIG.
2
. If the level of vacuum is below the predetermined level, then the workpiece is not engaged by the vacuum responsive device
32
, and the present invention is in the blow-off mode. The controller
55
does not actuate the blow-off solenoid operated valve
34
because the workpiece has already been released from the vacuum responsive device
32
. At this point, the controller
55
remains idle, and the present invention stands ready for an input.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims, which scope is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures as is permitted under the law.
Claims
- 1. A method for generating and controlling a source of vacuum produced from a source of pressurized air in communication with at least one vacuum responsive device, the method comprising:selectively providing a flow of pressurized air from said pressurized air source to a vacuum creating device; creating vacuum through a flow of pressurized air through said vacuum creating device and communicating said vacuum to said vacuum responsive device; selectively providing a flow of pressurized air from said pressurized air source to said vacuum responsive device; and maintaining the operating condition of said vacuum responsive device during the loss and resumption of power.
- 2. The method as stated in claim 1, wherein said creating vacuum further comprises:directing said pressurized air through at least one venturi to generate sub-atmospheric pressure.
- 3. The method as stated in claim 1, wherein said selectively providing pressurized air to said vacuum creating device further comprises:actuating a first solenoid operated valve between an open position, wherein pressurized air flows through said first solenoid operated valve from said pressurized air source, and a closed position, wherein pressurized air is blocked from flowing through said first solenoid operated valve; actuating a second solenoid operated valve between a first position, wherein pressurized air from said first solenoid operated valve flows through said second solenoid operated valve, and a second position, wherein pressurized air from said first solenoid operated valve is blocked from passing through said second solenoid operated valve; and moving a first air operated valve between an open position, wherein pressurized air from said second solenoid operated valve moves said first air operated valve to an open position to allow pressurized air from said pressurized air source to flow to said vacuum creating device, and a closed position, wherein pressurized air is blocked from passing through said first air operated valve to said vacuum creating means.
- 4. The method as stated in claim 1, wherein said selectively providing pressurized air to said vacuum responsive device further comprises:actuating a solenoid operated valve between an open position, wherein pressurized air flows through said solenoid operated valve from said pressuirized air source, and a closed position, wherein pressurized air is blocked from passing through said solenoid operated valve; and moving an air operated valve between an open position, wherein pressurized air flows from said solenoid operated valve to move said air operated valve to said open position to allow pressurized air from said pressurized air source to flow to said vacuum responsive device, and a closed position, wherein pressurized air from said pressurized air source moves said air operated valve to a closed position to block pressurized air from passing through said air operated valve to said vacuum responsive device.
- 5. The method as stated in claim 1, wherein said maintaining the operating condition of said vacuum responsive device further comprises:moving air operated valve between an open position, wherein pressurized air from said pressurized air source flows through said air operated valve to said vacuum creating device, and a closed position, wherein pressurized air from said pressurized air source is blocked from passing through said air operated valve; said selectively providing pressurized air to said vacuum creating device providing pressurized air to said air operated valve to move said air operated valve to said open position; and providing a flow of pressurized air from said pressurized air source to said air operated valve to move said air operated valve to said closed position when said selectively providing pressurized air to said vacuum creating device is not providing pressurized air to said air operated valve.
- 6. The method as stated in claim 1, further comprising:sensing the level of vacuum to said vacuum responsive device.
- 7. The method as stated in claim 6, further comprising:controlling said selective providing of pressurized air to said vacuum creating device wherein if the vacuum level after the loss and resumption of power is above a predetermined level, then pressurized air is selectively provided to said vacuum creating device.
- 8. A method for generating and controlling a source of vacuum produced from a source of pressurized air in communication with at least one vacuum responsive device, the method comprising:selectively providing a flow of pressurized air from said pressurized air source to at least one venturi; generating sub-atmospheric pressure by passing a flow of pressurized air from said pressurized air source through said venturi and communicating said sub-atmospheric pressure to said vacuum responsive device; selectively providing a flow of pressurized air from said pressurized air source to said vacuum responsive device; and moving a last function valve in response to a flow of pressurized air to maintain the same operating condition of said vacuum responsive device during the loss and resumption of power.
- 9. The method stated in claim 8, wherein said selectively providing pressurized air to said venturi further comprises:actuating a vacuum solenoid operated valve between an open position, wherein a flow of pressurized air passes through said vacuum solenoid operated valve from said pressurized air source, and a closed position, wherein said flow of pressurized air from said pressurized air source is prevented from passing through said vacuum solenoid operated valve; actuating an external power solenoid operated valve between a first position, wherein pressurized air from said vacuum solenoid operated valve is allowed to flow through said external power solenoid operated valve, and a second position, wherein pressurized air from said vacuum solenoid operated valve is not allowed to pass through said external power solenoid operated valve; and moving a vacuum pilot valve between a first position, wherein a flow of pressurized air from said external power solenoid operated valve moves said vacuum pilot valve to an open position and pressurized air from said pressurized air source flows through said vacuum pilot valve to said venturi, and a second position, wherein said pressurized air source moves said vacuum pilot valve to said second position and atmospheric pressure is vented through said vacuum pilot valve.
- 10. The method as stated in claim 9, further comprising:moving a vacuum valve between an open position, wherein a flow of pressurized air from said vacuum pilot valve moves said vacuum valve to said open position and pressurized air from said pressurized air source flows through said vacuum valve to said venturi, and a closed position, wherein a flow of pressurized air from said pressurized air source moves said vacuum valve to a closed position and pressurized air from said pressurized air source is blocked from passing through said vacuum valve.
- 11. The method as stated in claim 8, further comprising:sensing the level of vacuum applied to said vacuum responsive device.
- 12. The method as stated in claim 11, further comprising:reading the level of vacuum determined by said sensing the level of vacuum after the loss and resumption of power, and if the level of vacuum is above a predetermined level, then pressurized air is continually provided to said venturi, and if the level of vacuum is below a predetermined level, then pressurized air is not provided to said venturi or to said vacuum responsive device.
- 13. The method as stated in claim 8, wherein said selectively providing a flow of pressurized air to said vacuum responsive device comprises:actuating a blow-off solenoid operated valve between an open position, wherein pressurized air from said pressurized air source flows through said blow-off solenoid operated valve, and a closed position, wherein pressurized air is blocked from passing through said blow-off solenoid operated valve; and moving a blow-off valve between an open position, wherein a flow of pressurized air from said blow-off solenoid operated valve moves said blow-off valve to said open position and pressurized air from said pressurized air source flows through said blow-off valve to said vacuum responsive device, and a closed position, wherein a flow of pressurized air from said pressurized air source moves said blow-off valve to said closed position to block pressurized air from passing through said blow-off valve.
- 14. The method as stated in claim 8, wherein said moving said last function valve further comprises:moving said last function valve between an open position, wherein a flow of pressurized air from said pressurized air source to said venturis moves said last function valve to said open position and allows pressurized air from said pressurized air source to flow through said last function valve to said venturi, and a closed position, wherein a flow of pressurized air from said pressurized air source to said vacuum responsive device moves said last function valve to said closed position to block pressurized air from passing through said last function valve.
- 15. A method for generating and controlling a source of vacuum produced from a source of pressurized air in communication with at least one vacuum responsive device, the method comprising:generating sub-atmospheric pressure in response to a flow of pressurized air through at least one venturi and communicated to said vacuum responsive device; moving a vacuum pilot poppet valve between an open position, wherein pressurized air flows from said pressurized air source to said venturi, and a closed position, wherein said pressurized air is blocked from passing through said vacuum pilot poppet valve; actuating an external power solenoid operated valve to an open position, wherein pressurized air flows through said external power solenoid operated valve to move said vacuum pilot poppet valve to said open position; actuating a vacuum solenoid operated valve between an open position, wherein pressurized air from said pressurized air source flows through said vacuum solenoid operated valve to said external power solenoid operated valve, and a closed position, wherein pressurized air is blocked from passing through said vacuum solenoid operated valve; moving a blow-off poppet valve between an open position, wherein pressurized air from said pressurized air source flows to said vacuum responsive device, and a closed position, wherein pressurized air is blocked from flowing through said blow-off poppet valve to said vacuum responsive device; actuating a blow-off solenoid operated valve between a first position, wherein pressurized air from said pressurized air source moves said blow-off poppet valve to said open position, and a second position, wherein pressurized air is blocked from flowing through said blow-off solenoid operated valve; moving a last function valve between an open position, wherein pressurized air from said vacuum solenoid operated valve moves said last function valve to said open position to allow pressurized air to flow to said external power solenoid operated valve, and a closed position, wherein pressurized air from said blow-off solenoid operated valve moves said last function valve to said closed position to prohibit the flow of pressurized air to said vacuum responsive device during the loss and resumption of power to said solenoid operated valves; and actuating said external power solenoid operated valve between an actuated position, wherein said external power solenoid directs pressurized air from said vacuum solenoid operated valve to said vacuum pilot poppet valve, and a deactuated position, wherein said external power solenoid operated valve directs pressurized air from said last function valve to said vacuum pilot poppet valve to maintain pressurized air to said venturi thereby maintaining vacuum to said vacuum responsive device during the loss and resumption of power to said solenoid operated valves.
- 16. The method stated in claim 15, further comprising:moving at least one vacuum poppet valve between an open position, wherein pressurized air from said vacuum pilot poppet valve moves said vacuum poppet valve to said open position to allow pressurized air from said pressurized air source to flow to said venturi, and a closed position, wherein pressurized air from said pressurized air source moves said vacuum poppet valve to said closed position to prevent pressurized air from flowing to said venturi.
- 17. The method stated in claim 15, further comprising:sensing the level of vacuum being applied to said vacuum responsive device.
- 18. The method stated in claim 17, further comprising:reading the level of vacuum determined by said vacuum sensor, and if after the loss and resumption of power, the level of vacuum is above a predetermined level, then said vacuum solenoid is actuated.
US Referenced Citations (3)