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Патент USA US2110593

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Mai-ch 8, 1938.
w. ERNST
211059?
PRESS CONTROL SYSTEM
Filed Nov. 28, 1934
‘
2 Sheets-Sheet 1
.58
March s, ‘1938.
>
w. ERNST
2,110,593
PRESS CONTROL SYSTEM
Filed Nov. 28, 1934
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Patented Mar. ‘a, 1938
, ‘2,110,593
UNITED ‘STATES
PATIENT oFFIca
2,110,593
mass comer. SYSTEM
Walter Ernst, Mount Gilead, Ohio, assignor,
by .
mesne assignments, to The Hydraulic Press
Corporation, Inc., Wilmington, DeL, a corpo
ration of Delaware
Application November 28,1934, Serial No. 755,245
4 Claims.
(Cl. 60-52)
’ This invention-relates to pressure-exerting ma
chinery and, in particular, to systems for the
and base members. The top piece H is provided
' with a hydraulic cylinder I3 having a piston head
I 4 and piston rod IS. The latter is connected to
One‘object of my invention is to provide a the
press platen l6 which re'ciprocates vertl-,
5 pressure-responsive system for‘ the reversal of a
control of presses.
press when a predetermined position of the
platen has been reached, this system being ap
plicable to presses of any type whether mechani
cal or hydraulic.
10 ‘Another object is to provide a press control
cally between the guide plates‘ I‘! attached to the
sides of the press. The base III is provided with
an anvil-like portion I8 for receiving the work
or dies by which the operation of the press is
accomplished.
\
system wherein the pressure exerted by the press
is caused to operate an electrical control circuit
The platen I6 is provided with an extension 10
arm l9 secured thereto and having a portion 20
tion of the platen has been reached.
carbon plates 2|, whose current-carrying ability
Another object is to provide an electro-me-.
chanical system for the control of presses where
carbon pile 2| againstthe thrust ofthe platen 15
to reverse the press when a predetermined posi- ' adapted to engage a pile of material, such as the '
varies under pressure. 'A base 22 supports the
in the pressure exerted by the platen is caused to - arm Ill. The electrical connections of the carbon
pile 2| will be described later.
'
'
vary the current supplied to the control circuit,
The
hydraulic
circuit
for
operating
the
press
and this in turn is caused to operate the reversal
consists of a pump 25 of any suitable type, and
20 devices.
.
Another object is to provide a press control having a pressure line 26 and a suction line 21. 20
system wherein the press platen is caused to The latter withdraws oil from the tank 28. From
compress a ‘material whose current-carrying the tank 28, a discharge line 29 runs to a re
ability varies under pressure, such as a pile of versing valve 30, and conducts fluid from the ports
15 carbon plates, this variation of pressure and the 3| and 3_2~at the opposite ends thereof.
The reversing valve 30 is provided with a valve 25
consequent variation of current being caused to
operate relay devices which in turn actuate the rod 33 having the spaced heads- 34 and 35. A
port 36 serves to admit pressure from the pres
reversal mechanism of the press.
Another object is to provide an arrangement sure line .26 of the pump, whereas a port 37‘ is
connected to the working or forward line 38 com
0 for reversing a press when a predetermined posi
with the space above the piston head 30
tion of the platen has been reached, wherein the municating
it in the hydraulic cylinder i3.v
'
pressure exerted by the platen is caused to vary
From
a
port
39,
the
return
line
llii
runs
to
the
the current-carrying capacity of an electrical
circuit, and this in turn is caused to operate a space below the piston head it in the hydraulic
5 “trigger action” relay, such as a vacuum tube cylinder I3. In the return line é‘iii is the high
pressure relief valve 4|. From the relief valve 35
of the “thyratron” or “grid glow” type. the op
eration of the relay causing the actuation of the ill, the pipe 42 communicates with the discharge
line 29 running to the tank 23. The high pres~
press reversal means, such as a reversing valve.
sure relief valve 4| is adapted to discharge ?uid
In the drawings:
)
Figure l is a diagrammatic front elevation of into the discharge line 29 and tank 28 when the
a press, partly in section, showing the principal’ pressure in the line 40 exceeds a predetermined 40
mechanical elements in one embodiment of my amount. The working or forward line .‘iil simi
press control ‘system as applied to a hydraulic larly contains a high pressure relief valve t3 hav
ing a discharge line 44 communicating with the
press;
tank 28 to discharge ?uid when the pressure in
Figure 2 is an electrical wiring diagram show
ing the connections of the various electrical the line exceeds a. predetermined amount. These 45
relief valves 4i and 43 may be of any suitable
elements in the press control system shown in type.
‘
Figure 1.
The‘valve rod 33 having the piston heads 34 l
Figure 3 is a view of a portion of the circuit
of Figure 1, showing a modi?ed construction and 35 is connected to the armature d5 01’ a sole
wherein a solenoid‘ is caused to operate the shift > noid 46. The valve rod 33 is urged in the oppo 50
site direction to the pull of the solenoid 46 by the
ring of a variable delivery pump.
\
coil
spring 41 engaging the collar 48, and urging
' Referring to the drawings in detail, Figure 1
shows a press consisting of a base l0, a. top piece the valve in a righthand direction.
The electrical circuit for the control of the
II, and strain rods l2 interconnecting the top
press'is shown in Figure v2. Current is supplied 55
3,110,598
2
moved into the dotted positions shown in Figure
from the power lines 58 and 5| to the primary 1, against the urge of the coil spring 41. Pres
winding 52 of a transformer 58. The trans sure ?uid now passes from the pump 25 and
former 58 is provided with suitable secondary the pressure line 28 through the middle chamber
windings 54, 55, and 58. From the secondary of the valve 88, out the port 81 and through the
winding 55, the line 51 runs to one terminal of working line 88 to the chamber above the piston
the current-varying unit or carbon pile 2|. From head l4, causing the latter to move down, to
‘
platen l8. The ?uid discharged
the opposite terminal of the carbon pile 2 l , the line
58 runs tov the grid 59 of the vacuum tube 88 by from the chamber beneath the piston head l4
way of the resistor 8|. Between the line 82 run
passes through the return line 48, and the port 10
ning from the opposite terminal of the trans
89 into the rlghthand end chamber of the valve
10 former secondary 55 and the line 58 is arranged
88, thence through the port 82 into the discharge
the capacitor 88. The line .82 continues to the line 29 running to the tank 28. The relief valves
negative pole of the battery or other current 4| and 48 serve to constantly pass the ?uid there
source 54, the opposite or positive terminal of through and do not in?uence the operation of 15
which is/connected by the lines 85 and 88 to the the circuit except when an excessive pressure de
15 electrode 81 of the vacuum tube 88. The elec
veiops.
trode 81 is heated by the ?lament 88, current
As the platen moves downward and engages
being supplied for this purpose by the lines 89 the work, its arm l9 compresses the carbon pile
and 18 running from the transformer secondary 2|, causing its electrical resistance to be de 20
creased. As this occurs, current is permitted to
20 55
The lines 85 and 88 are connected by the line flow therethrough in increasing amounts from
1| to the negative terminal of the battery or other the transformer secondary 55, by way of the lines
source of current 12. From the positive terminal 51 and 58, changing the potential of the grid 59
of the latter, the line 18 runs to one terminal of
25
the operating coil 14 of the normally-closed elec
tro-magnetic switch 15, having the armature 15.
The opposite terminal of the operating coil 14 is
in the vacuum tube 88.
The vacuum tube 88 is preferably of the so
called “thyratron” or “grid glow”'type, wherein
connected by the line 11 to the plate 18 of the
vacuum tube 88. A spring 19 urges the switch
bar 15 into a normally-closed position.
One terminal of the transformer secondary 54
is connected by the line 88 to the manual switch
8| and thence by the line 82 to the upper switch
bar 88 of the normally-open contactor switch 84.
35 The line 85 runs to the lower switch bar 85
thereof. The switch bars 88 and 88 of the con
tactor switch 84 ‘are urged into normally-open
a substantially constant voltage drop exists be
tween the cathode 61 and the anode or plate 18.
The potential of the grid 59 is kept negative by 30
the battery 64. When the potential of the grid
59, however, exceeds a predetermined amount,
the vacuum tube 88 suddenly becomes operative,
causing the electron flow to conduct current
positions by the spring 81.
The fixed terminal of the electro-magnetic
40 switch bar 15 and of the upper contactor switch
bar 88 are interconnected by the line 88. From
the fixed terminal of the lower contactor switch
bar 86, the line 89 runs to one terminal of the
solenoid 48, from the opposite terminal of which
45 the line 98 runs to the transformer secondary
winding 54. From the latter the line 9| runs to
the operating coil 92 of the contactor switch 84,
and from the opposite side thereof, the line 98
runs to one terminal of the manual switch 8|;
50 whence’the line 94 runs to the electro-magnetic
switch bar 15. ‘The contactor switch 84 is pro—
vided with an armature 95, engaging the switch
bars 88 and 85, and actuated by the operating
coil 92 in the manner described below.
55
25
'
In operation, the press is started by closing the
manual switch 8|, which is preferably of the push
button variety. Current from the transformer
secondary 54 is then caused to energize the'op
erating coil 92 of the contactor switch 84 by way
of the line 88, switch 8|, and lines 98 and 9|.
The consequent closing of the switch bar 88
against the urge of the spring 81 causes the op
erating coil 92 to be henceforth energized when
the switch 8| is released. The holding circuit
thereof‘ includes the lines 88 and 82, the switch
bar 88, the. line 88, the normally-closed switch
bar 15, and the lines 94, 98 and 9| to the trans
former'secondary 54. The closing of the lower
through the'circuit represented by the lines 18 35.
and 11, the operating coil 14 of the contactor
switch 15, the battery 12, the lines 1| and 88, the
cathode 81 and plate 18.
The vacuum tube 88 thus acts, in e?ect, like a
relay which is operative only when the current
supplied to the grid thereof exceeds the “firing
potential” of the tube. The “trigger action” of
the tube 58 is not operative until the current
passed by the carbon pile 2| attains a suflicient
magnitude through the lowering of the resist—_
ance thereof by the compression of the carbo
pile.
The energization, in this manner, of the oper
ating coil 14 of the electromagnetic switch 15
lifts the armature 18 and the switch bar thereof,
opening the circuit between the lines 94 and 88
against the urge of the spring 19. This breaks
the holding circuit~ of the contactor switch coil
92, causing the latter to become de-energized and
the switch bars 88 and 88 thereof to be opened 51
by the urge of the spring 81. The opening of
the switch bar 88 breaks the 'circuit between the
lines 85 and 89, and consequently de-energizes
the windings of the solenoid 48, permitting the
valve rod 88 to be‘ urged to its righthand position
under the in?uence of the coil spring 41.
Under the urge of the spring 41, the valve
heads 84 and 85 take the righthand positions, as
shown by the solid lines in Figure 1. Under these
circumstances, pressure ?uid ?ows from the pres
sure line 28 of the pump 25 through the middle
chamber of the valve 88 and the line 48 and the
relief valve 4| into the space beneath the piston
head |4,v causing the latter to rise and the platen
l8 to be retracted. The ?uid in the space above
the piston head |4 retu'rnsto the tank 28 by way
switch bar 88 causes the winding of the sole
noid v48v to be likewise energized from the trans
former secondary 54 through the lines 88, 82, and 1 of the line 88, the relief valve 48, the port 81,
85, the switch bar 88, and the lines 88 and 88.
the lefthand end chamber of the valve 88, the
The sue
on of the solenoid 48 causes its
armature 45and the valve rod 88 to be shifted to
the‘ left, causing thevalve heads 84 and 88 tobe
port 8| andthedischargeline2t>
'Ibeplawn limesupwarduntilitme“
2,110,593
the top of its stroke, where it may be halted by
any suitable means. In the arrangement shown,
.the relief valve 4| will then cause the pressure
?uid to be discharged through‘ the line 42 into
the tank 28 by way of the discharge line 29.
As the platen i6 nears the top of its stroke,
3
?uid from said pump to said plunger, an electri
cally-controlled shifting element for shifting said ..
?uid-reversing means, a current-varying instru
mentality responsive to the application 01' pres
sure for varying the electric current passing
therethrough, means associated with said plunger
it ‘may be caused to operate a positionally re
for simultaneously‘ transmitting pressure to a
sponsive switch 98, breakingthe circuit in the. work-piece and said instrumentality upon oper
line 11, and consequently de-energizing the plate ation of said plunger, and an electrical device
10 circuit of the vacuum tube 80. Some arrange
operatively responsive to the reception of a pre 10
ment of this sort is advisable, since the "thyra
determined current from said current-varying in
tron” or “grid glow” tubes have the peculiarity strumentality to change the electrical condition
of starting operation when the grid potential ex
01! said electrically-controlled shitting element
ceeds the “?ring potential” but of not stopping and thereby bring about the shifting of said
when
the
grid
potential
subsequently
falls
below
“ 15
?uid-reversing means.
15
the "?ring potential”. The opening oi’ the switch
2. In combination, a hydraulic press having a_
98 by the platen l6 at the top of its stroke de~en~ reversibly movable plunger, a_ pump, ?uid-revers
ergizes the coil 14 of the electromagnetic switch
15 and allows its switch bar to be- returned to
its normally-closed position under the in?uence
of the coil spring 19.
To re-start the press i'or another working
stroke, the switch button 8i is again depressed,
and the foregoing cycle 01' operations repeats it
25 sell‘. As the platen passes downward, however,
it releases the positionally-responsive switch 98,
thus again closing the circuit in the line l1 and
placing the plate circuit again in condition for
operation. It will be understood, however, that if
30 alternating current is utilized in place of the di
rect current from the direct current source 12 to
energize the plate circuit, the operation of the
tube 80 may be interrupted by the phase change
thereof.
It will be understood that instead of the re
versing valve 30 and ,the constant delivery pump
25, a variable delivery pump having its ?uid lines
i 26 and I2‘! connected respectively to the forward
and return lines 38 and 40 may be used and the
40 flow thereof varied. by suitable electrical means
responsive to the action of the electrical circuit
described above. For example, in Figure 3, the
armature 45 of the solenoid 48 is operatively con
nected to the ?ow-varying or shitting ring “ll
45 of a variable delivery pump I00, and the'sub
sequent shifting thereof brought about by the
operation of the solenoid 46 is thus caused to
reverse the ?ow of the ?uid in the pipe lines
38 and 40 without the necessity for employing
50 the reversing valve 30. For the p
:0,
oi’ com
ing means for reversibly distributing the pressure
?uid from said pump to said plunger, an electri
cally-controlled shifting element for shifting said
?uid-reversing means, a current-varying instru
mentality responsive to the application of pres
sure for varying the electric current passing
therethrough, means associated with said plunger
for simultaneously“ transmitting pressure to a
work-piece and said instrumentality upon oper
ation 01' said plunger, and a vacuum tube relay
operatively responsive to the reception of a pre
determined current irom said current-varying in
strumentality to change the electrical condition
of said electrically-controlled shifting element
and thereby bring about the shifting oi.’ said ?uid
reversing means.
»
3. In combination, a hydraulic press having a
reversibly movable plunger, a pump,- ?uid-revers
ing means for reversibly distributing the pres
sure ?uid from said pump to said plunger, an
electrically-controlled shifting element for shii't
ing said ?uid-reversing means, a current-varying
instrumentality responsive to the application of
pressure for varying the electric current passing
therethrough, means associated with‘ said plunger
for simultaneously transmitting pressure to a
work-piece and said instrumentality upon oper
ation-of said plunger, and an electrical device
operatively responsive to the reception of a pre- -
determined current from said current-varying in
strumentality to change the electrical condition
01' said electrically-controlled shifting element
and thereby bring about the shifting of said ?uid
reversing means, said current-varying instrumen
pensating for the unequal supply of ?uid re
quired on opposite sides oi’ the piston head ll,
comprising a pile of carbon elements.
due to the space occupied. by the piston rod ID, tality
4.
In
combination, ahydraulic press having a
a compensating valve I0! is arrangedbetween the reversibly
movable plunger, 9. pump, ?uid-re
55 pipes 30 and 40 with its end chambers connected versing means for reversibly distributing the pres 55
thereto. Its middle chamber is connected to the sure ?uid from said pump to said plunger, an
line 21' from the ?uid tank 28, and its valve electrically-controlled shitting element for shift
element I03 automatically moves to and fro to
permit ?uid to be drawn from the tank 28 into ing said ?uid-reversing means, a current-varying
instrumentality responsive to the application of
60 the space below the piston head H, or' to be
discharged from the space above it. The details pressure for varying the electric current passing
of the compensating valve I02 i'orm no part 01' the therethrough, means associated with said plunger
for simultaneously transmitting pressure to a
present invention, and will be found i'ully dis
closed in the United States Patent No. 1,653,350, work-piece and said instrumentality upon oper
ation of said plunger, and an electrical device
65 granted on December 20, 1927 to Walter Ernst.
operatively responsive to the reception of awe
It‘ will be understood that r desire to compre
hend within my invention such modi?cations as determined current from said current-varying
may benecessary to adapt it to varying conditions instrumentality to change the electrical condition
and uses.
70~ ' ' Having thus fully described my invention, what
I claim as new and desire to secure by Letters
Patent is:
of said electrically-controlled shifting element
and thereby bring/about the shifting of said ?uid-5
reversing means, said ?uid-reversing ‘means com
g '8. valve and said shitting. element com-
1. In combination, a hydraulic press having a 'prising a solenoid
reversibly movable plunger, a pump, ?uid-revers
mm
d Valve.
75 ing means for reversibly distributing the pressure
pted when enermed to
.
.
WALTER
.
70’
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