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Патент USA US2404980

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July 30, 1946-
E. A? MUNSCHAUER JR
2,404,980
MACHINE CONTROL MEANS
Filed Feb. 16, 1944
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EDWIN A. MUNSCHAUER_UR.
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Patented July 30, 1946
2,404,980
UNITED STATES PATENT OFFICE
2,404,980
MACHINE CONTROL MEANS
Edwin A. Munschauer, In, Buffalo, N. Y., as
signor to Niagara Machine & Tool Works, Buf
falo, N. Y.
Application February 16, 1944, Serial No. 522,678
8 Claims.
(Cl. v19.2?131)
2
This invention relates to novel control circuits
for single stroke machines such as punch presses
and the like.
and produce rotation of the crank shaft. The
clutch elements are conventionally biased to en
.
gaging position by spring means, or otherwise.
Upon release of the pulling impulse on the throw
The electric control circuit arrangement set
forth herein and shown in the accompanying
drawing provides a greatly simplified electrical
out pin, it is moved back to a position where it
engages the clutch elements to cam the clutch
elements to disengaged position so that the crank
shaft is stopped at the end of a single rotation
means for the provision of what is known in the
art as two-hand control. In providing tripping
means for punch presses, metal shears, and. simi
lar machines, it is frequently desired to place a
pair of push buttons in such relative position that 10
the operator must use both hands to press both
buttons to institute a cycle of operation. This
is done for the obvious reason of insuring that
the operator?s hands are on the buttons and not
in a dangerous or unsafe position. It has been
found that operators, heedless of the safety provi
sions so made, tape down or "stake? one of the
buttons in order to speed up or simplify their
work.
thereof.
From what has been said it will be seen that
the throwout pin, after having been pulled, must
be released substantially before the completion
of a single rotation of the crank shaft if it is to
declutch and stop the same at the end of a single
revolution.
In the form illustrated by way of example, the
clutch throwout pin I2 is pivotally attached to a
rock arm M which has a central pivotal mounting
i5 securing it to a punch press frame IS. The
other arm of the rock arm i4 engages between a
The advantages of simplicity and security of
compression coil spring I? and the end of a piston
operation inherent in the present novel circuit
rod l8 of a piston I9. A casing 23 provides a
arrangement will be obvious to those skilled in
?uid chamber 2| in which the piston I9 is dis
the art from a perusal of the ensuing speci?ca
posed for axial movement and also supports and
tion in conjunction with the accompanying draw
ing. While a particular adaptation is shown in 25 houses the compression spring l1.
As shown in Fig. 1, the parts are in inactive
detail herein by way of example, it is to be un
position with the clutch released and spring l1
derstood that the electrical control of the inven
cts through the adjacent arm of rock arm Hi
tion may be applied with like bene?t to any kind
of clutch or clutch tripping arrangement or, in 30 to retain piston I9 in its illustrated position. A
fact, to any other machine controlling devices
susceptible of control in an analogous manner.
The principles of the present invention are not
to be considered as limited in spirit or scope,
otherwise than as de?ned in the appended claims.
In the drawing:
Fig. 1 is a fragmentary side elevational view
of a punch press showing the crank shaft thereof
and portions of the clutch tripping mechanism;
and
Fig. 2 is a wiring diagram showing the novel
electrical control circuits of the present inven
tion.
In the drawing like characters of reference de
note like parts throughout and the numeral i0
designates a punch press crank shaft having
thereon a clutch l I. The details of the clutch
are not shown since suitable single-revolution
clutches are well known and may vary in detail.
In common with most of the mechanical single 50
revolution clutches in use at present, a throwout
pin 12 is provided and, as is well known to those
conventional solenoid operated valve shown in
outline at 22 in Fig. 1 is adapted when its oper
ating circuit is energized, to connect a ?uid pres
sure source 23 to chamber 2! through a conduit
24, which moves the piston i 9 to the left as viewed
in Fig. 1 and pulls the clutch throwout pin,
through rock arm l4. When the operating cir
cuit of the solenoid valve is de-energized, the
valve moves to close oil" the pressure source 23
and vent conduit 24, whereupon spring I?! returns
the piston Hi to its illustrated position and clutch
throwout pin i2 is returned to a position for dis
engaging the clutch at the end of an operating
cycle of the crank shaft.
Fig. 2 schematically illustrates the control cir
cuits for solenoid valve 22, which are so arranged
that a separate manual two-hand push button
pressing operation is required for each press
cycle. That is, ibOth buttons must be released
and re-depressed, after a cycle has been instituted
by pressing both buttons and after the press cycle
has been substantially completed, before a suc
ceeding cycle can be begun. This positively pre
vents avoidance of the two-hand safety opera
tion by tying down or ?staking? one of the but
skilled in the art, the throwout pin is pulled away
from the clutch, to the right as viewed in Fig. 1,
to cause the clutch elements to engage axially 55
tons. Means are further provided to prevent an
�404,980
operator from releasing both buttons and re-de
pressing them during a press cycle to re-with
or because he has already re-depressed one or
both buttons, or because either button has been
draw the throwout pin and cause the machine
to continue on into a second cycle of continuous
operation.
4
or 38 is still closed by reason of failure of the
operator to remove his hands from both buttons,
?staked,? a holding circuit for the relay winding
Further, the proposed circuit ar
45 will be established through conductor 5c,
rangement is such that all circuits are open be
whichever of the switches 36 or 38 is closed, re
tween press operations.
turn conductor 5|, and the holding circuit switch
Referring to Fig. 2, supply conductors are desig~
52.
nated 3G and 3! and the numeral 32 denotes the
It is thus essential that both buttons 31! and 35
10
winding of solenoid valve 22. A pair of push but
be released to open both switches 36 and 38 before
tons are indicated at 3A and
respectively, and
it is possible to again close the solenoid valve
it is to be understood that the push buttons are
winding circuit since this can be effected only
to be disposed at spaced points, such as at opposite
through de-energization of relay winding 136 and
sides of the front of the press frame, whereby an
consequent re-closure' of the normally closed
operator can depress both buttons only by em
switch as in the solenoid valve winding con
ploying both hands. Each button, when de
ductor 43.
pressed, closes two switches, and the buttons are
It will be noted that? when buttons as and 35
biased to return automatically to open position
are released, they close no circuits and that all
when manual pressure is removed. The button 355
auxiliary circuits are likewise open at all times
controls switches 36 and 3'! and button 35 con?
when the push buttons 3% and 35 are in released
trols switches 33 and 39.
position.
It will be noted that an independent energizing
What is claimed is:
circuit for solenoid valve winding 32 is present.
1. Control means for a machine having a single
The winding 32 connects with supply conductor
revolution clutch including an element movable
36, a conductor �, the switches 31 and as which .
are connected in series, and a conductor 43 lead
between clutch-engaging and clutch~disengaging
positions, an electromagnet energizable to move
said element to clutch-engaging position, means
biasing said element to clutch-disengaging posi
tion, an energizing circuit for said electromagnet,
ing to the opposite supply conductor 36 and con
taining a normally closed switch Mi.
A relay winding is connects with supply con
ductor 3! and has two parallel energizing cir- ;
cults, one designated 4'! and containing a nor
mally open limit switch 48 and the other desig
a pair of switches connected in series in said cir
cuit, a pair of spaced control elements manually
movable to close said switches and energize said
nated 5S and connecting in parallel with switches
35 and 38. A return conductor from the parallel
connected switches 35 and 3B is designated 5! and
contains a normally open switch 52.
Both the normally closed switch ill! and the
normally open switch 52 are under control of the
relay winding 46. When winding 1% is de-ener
gized the switches 44 and 52 are in their natural
electromagnet, a relay and an energizing circuit
therefor, a second pair of switches closable simul
taneously with the ?rst pair by manual move
ment of the control elements and connected in
parallel in said relay circuit, a normally closed
switch in said electromagnet circuit and a nor
mally open switch in said relay circuit, said last
two switches being movable by energization of
closed and open positions, respectively. Ener
said relay to open and closed position, respectively,
gization of winding 65 opens switch M and closes
a second normally open switch in series with said
switch '52 and they remain in those conditions
relay and in shunt with respect to said ?rst nor
until the winding is again de-energized,
mally open switch and means operable during the
45
Referring to Fig. l, a cam 55 is shown ?xed to
cycle of said single-revolution clutch to momen
the crank shaft iii and the numeral 56 designates
tarily close said second normally open switch to
a casing which houses the limit switch indicated
energize said relay and establish a holding cir
at 48 in the wiring diagram, Fig. 2. The cam 55
cuit therefor through said ?rst normally open
has a lobe 5? which is so located that it engages a
switch and either of said second pair of switches
push button 59 of limit switch casing 55 to mo 50 to de-energize the electromagnet through open
mentarily close limit switch 113 in passing. The
ing of the normally closed switch in its circuit in
timing of cam 55 is such that the limit switch IE8
the event said circuit is then closed through said
is momentarily closed toward the end of a cycle
?rst pair of switches.
of crank shaft operation, but a su??lcient distance
2. In a cyclic control for a machine having
from the end of the stroke to permit the throwout
means movable between operating and non-oper
pin 12 to disengage the clutch by the end of a
ating positions, an electromagnet energizable to
cycle of operation.
move said means to operating position, means
The operation of the foregoing control circuit
biasing said means to non-operating position, an
arrangement will now be described. In the ?rst
energizing circuit for said electromagnet, a pair
place, it is essential that the operator depress 60 of switches connected in series in said circuit, a
both buttons 34 and 35 to close the series con
pair of spaced control elements manually mov
nected switches 31 and 39 to energize the wind
able to close said switches and energize said elec
ing 32 of the solenoid valve and pull the throwout
tromagnet, a relay and an- energizing circuit
pin I'Z to initiate a cycle of crank shaft opera
therefor, a second pair of switches closable si
65 multaneously with the ?rst pair by manual move
tion.
When the limit switch 48 closes momentarily,
ment of the control elements and connected in
which as has been stated is preferably close to the
parallel in said relay circuit, a normally closed
end of the stroke to prevent release and re-depres�
switch in said electromagnet circuit and a nor
sion of the buttons 34 and 35 before the end of the
mally open switch in said relay circuit, said last
70
stroke, it establishes a circuit through conduc
two switches being movable by energization of
tor Lil which energizes relay winding 45 and opens
said relay to open and closed position, respec
normally closed switch 44 to break the solenoid
tively, a second normally open switch in series
valve winding circuit. The relay winding is
with said relay and in shunt with respect to said
simultaneously closes normally open switch 52
?rst normally open switch and means operable
and if either of the parallel-connected switches 33 75
.
5
12,404,980
during the machine cycle to momentarily close
said second ?normally open switch to energize
said relay and establish a- holding circuit there
?for through said ?rst normally open Switch
and either of said second pair of switches to de
energ-iz'e the eIectrofna-g'net through opening of
the normally closed switch in its circuit in ?the
event said circuit is then closed through said ?first
pair of switches.
6
disengaging position, an energizing circuit for
said electromagnet, a pair of switches connected
in series in said circuit, a pair of ?spaced push
buttons ?manually movable to close? said switches
and energize said electro-magnet, means yield
ably biasing said push buttons to switch-open po
sition?, a relay and an energizing circuit therefor,
59, second pair of ?switches closable simultaneously
with the ?rst pair by manual movement of the
3. Control means for a machine having a sin
gle-revolution clutch including an element mov i0 push buttons and connected in parallel in said
able between clutcheen?gaging' 'an'd clutch-disen
gaging positions, an electromagnet energizable to
relay circuit, a normally closed switch in said
electromagnet circuit and a normally open switch
in said relay circuit, said last two switches being
move said element to clutch-engaging position,
by energization of said relay to open
means biasing said element to clutch-disengaging 15 movable
and
closed
position, respectively, ?a second nor
position, an energizing circuit for said electro
magnet, a pair of spaced manually movable con
trol velements and a switch means manually clos
able by each, ?said two switch means engaging
said ?energizing circuit in series to require inan
ual operation of?both control elements to ener
gize said electromagnet, a relay and an energiz
ing circuit therefor, said two switch means be
ing connected in parallel in said relay circuit,
mally open switch in series with said relay and ?in
shunt with respect to said ?rst normally open
switch and means operable during the cycle of
said single-revolution clutch to momentarily close
said second normally open switch to energize said
reIayQand establish ?a holding ?circuit therefor
through said ?rst normally open switch and either
of said second pair of switches to? (1V -'energize
the ele'ctroinagnet through opening of the nor
a normally closed switch in said electromagnet
circuit and a normally open switch in said relay 25 mally closed switch in its circuit ?in the event
said circuit is then closed through said ?rst pair
circuit, said last two switches being movable by
of switches.
energization of said relay to open and closed
6. In a cyclic control for a machine having
position, respectively, a second normally open
means movable between operating and non-oper
switch in series with said relay and in shunt
with respect to said ?rst normally open switch 30 ating positions, an electromagnet energizable to
move said means to operating position, means
and means operable during the cycle of said sin
biasing said means to non-operating position, an
gle-revolution clutch to momentarily close said
energizing circuit for said electromagnet, a pair
second normally open switch to energize said re
of switches connected in series in said circuit, a
lay and establish a holding circuit therefor
pair of spaced push buttons manually movable to
through said ?rst normally open switch and
close said switches and energize said electromag
either of said switch means to deenergize the
electromagnet through opening of the normally
closed switch in its circuit in the event said cir
cuit is then closed through said switch means.
4. In a cyclic control for a machine having
means movable between operating and non-oper
net, means yieldably biasing said push buttons to
switch-open position, a relay and an energizing
circuit therefor, a second pair of switches
closable simultaneously with the ?rst pair by
manual movement of the push buttons and con
nected in parallel in said relay circuit, a nor
ating positions, an electromagnet energizable to
mally closed switch in said electromagnet circuit
move said means to operating position, means
and a normally open switch in said relay circuit,
said last two switches being movable by energi
an energizing circuit for said electromagnet, a
zation of said relay to open and closed position,
pair of spaced manually movable control ele
respectively,
a second normally open switch in
ments and a switch means manually closable by
series with said relay and in shunt with respect
each, said two switch means engaging said ener
gizing circuit in series to require manual opera 50 to said ?rst normally open switch and means
operable during the machine cycle to momen
tion of both control elements to energize said
tarily
close said second normally open switch
electromagnet, a relay and an energizing circuit
to energize said relay and establish a holding
therefor, said two switch means being connected
biasing said means to non-operating position,
circuit therefor through said ?rst normally open
in parallel in said relay circuit, a normally closed
switch and either of said second pair of switches
switch in said electromagnet circuit and a nor
mally open switch in said relay circuit, said last 55 to de-energize the electromagnet through open
ing of the normally closed switch in its circuit
two switches being movable by energization of
in the event said circuit is then closed through
said relay to open and closed position, respective
said ?rst pair of switches.
ly, a second normally open switch in series with
7. Control means for a machine having a
said relay and in shunt with respect to said ?rst
normally open switch and means operable during 60 single-revolution clutch including an element
movable between clutch-engaging and clutch
the machine cycle to momentarily close said. sec
disengaging positions, an electromagnet energi
ond normally open switch to energize said relay
zable to move said element to clutch-engaging
and establish a holding circuit therefor through
position, means biasing said element to clutch
said ?rst normally open switch and either of said
switch means to de-energize the electromagnet
through opening of the normally closed switch in
its circuit in the event said circuit is then closed
through said switch means.
65
disengaging position, an energizing circuit for
said electromagnet, a pair of switches connected
in series in said circuit, a pair of spaced control
elements manually movable to close said switches
and energize said electromagnet, electromotive
5. Control means for a machine having a
single-revolution clutch including an element 70 means and energizing circuit means therefor, a
second pair of switches closable simultaneously
movable between clutch-engaging and clutch
with the ?rst pair by manual movement of the
disengaging positions, an electromagnet energiz
control elements and connected in parallel in
able to move said element to clutch-engaging po
sition, means biasing said element to clutch 75 said electromotive circuit means, a normally
closed switch in said electromagnet circuit and
2,404,980
8
electromagnet, electromotive means and energiz
a normally open switch in said electromotive cir
ing circuit means therefor, a second pair of
cuit means, said last two switches being movable
switches closable simultaneously with the ?rst
by energization of said electromotive means to
pair by manual movement of the control ele
open and closed position, respectively, a second
ments and connected in parallel in said electro
normally open switch in series with said electro
motive circuit means, a normally closed switch in
motive means and in shunt with respect to said
said electromagnet circuit and a normally open
?rst normally open switch and means operable
switch in said electromotive circuit means, and
during the cycle of said single-revolution clutch
last two switches being movable by energization
to momentarily close said second normally open
of said electromotive means to open and closed
switch to energize said electromotive means and 10 position, respectively, a second normally open
establish a holding circuit therefor through said
?rst normally open switch and either of said
second pair of switches to de-energize the electro
magnet through opening of the normally closed
switch in series with said electrornotive means
and in shunt with respect to said ?rst normally
open switch and means operable during the ma
chine cycle to momentarily close said second
switch in its circuit in the event said circuit is
then closed through said ?rst pair of switches.
normally open switch to energize said electro
8. In a cyclic control for a machine having
means movable between operating and non-oper
ating positions, an electromagnet energizable to
move said means to operating position, means
biasing said means to non-operating position, an
energizing circuit for said electromagnet, a pair
energize the electromagnet through opening of
of switches connected in series in said circuit,
a pair of spaced control elements manually mov
able to close said switches and energize said 25
motive means and establish a holding circuit
therefor through said ?rst normally open switch
and either of said second pair of switches to de
the normally closed switch in its circuit in the
event said circuit is then closed through said ?rst
pair of switches.
EDWIN A. MUNSCHAUER, JR.
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