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Патент USA US3069752

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Dec. 25, 1962
U. WALCHHUETTER
ELECTRI C AND ELEC TRONIC CIRCUITS FOR
Filed April ll, 1957
40 45
3,069,742
CONTROLLING FRICTION PRESSES
3 Sheets-Sheet l
Dec. 25, 1962
Filed April ll, 1957
U. WALCHHUETTER
3,069,742
ELECTRIC AND ELECTRONIC CIRCUITS FOR
CONTROLLING FRICTION PRESSES
5 Sheets-Sheet 2
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Dec. 25, 1962
Filed April l1, 1957
U. WALCHHUETTER
ELECTRI C AND ELECTRONIC CIRCUITS FOR
CONTROLLING FRICTION PRESSES
3,069,742
3 Sheets-Sheet 3
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Inventor:
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rier are mounted reciprocably in operating direction
from an initial position spaced from the .support portion
to an operating position in the region of the support
3,069,742
ELECTRIC AND ELECTRÜNÈS CERCUE'ES FÜR
CONTRÜLMNS FRECTHIJT‘J
Patented Dec. 25, i952
`
Ulrico Waichhnethter, Via Spartacio iii, lvi'iian, Italy
Filed Apr. 1l, 1957, Ser. No. 652,20i
Ciaims priority, application litaiy .italy 2l, i956
5 Claims. (Cl. 25-45}
The present invention `relates to electric control sys
tems for friction drive presses. More particularly, the
invention relates to a series of improvements introduced
to electric and electronic control circuits of friction drive
presses.
An object of this invention is to provide who-ily auto
Ul
portion and in return direction from operating position
to the initial position. The combined operating and
actuating arrangement includes ram advancing apparatus
for automatically moving the ram in the operating direc
tion toward the support portion, ram return apparatus
for automatically moving the ram in the return direction
away from the support portion, carrier advancing appa
ratus for automatically moving the material carrier in
the operating direction toward the support portion and
carrier return apparatus for automatically moving the
material carrier in the return direction away from the
matic movement of the material carrier or material.
support portion. The operating and actuating arrange
transporting carriage by applying an electric current
properly synchronized with the operation of the machine
ment includes a ram stopping arrangement associated
so that the forward and `the return movements of said
carrier occur only when the press ram of the machine
with the ram advancing apparatus and a carrier stopping
arrangement associated with the carrier advancing appa
ratus, the ram and carrier stopping arrangements being
is in its uppermost position, thus avoiding collisions be
interconnected for automatically interrupting movement
tween it and the carrier.
in the operating direction of the ram and of the material
carrier by the ram advancing apparatus and the carrier
Appropriate means are utilized to ensure a return
movement of the carrier when the press is blocked or
stopped for reasons that are not related to the carrier.
Another object of this invention is the provision of
ydirecting relays acting on the control circuits determining
the movements of the press, said relays being capable of
advancing apparatus, respectively, when during simul
taneous movement in the operating direction of both the
ram and the material carrier, the ram reaches a predeter
mined point of its movement in operating direction after
the material carrier has reached another predetermined
point of its movement in operating direction. The oper
selecting switch contacts in circuits that at a given instant
are to be operative or non-operative independently of
ating and actuating arrangement further includes an ar
the momentary open or closed position of the particular 30 rangement for automatically actuating the ram return
switches. The capacity of the directing relays therefore
apparatus and the carrier return apparatus for returning
permits .the arrangement of said switch contacts so as to
the ram and the material carrier respectively .to the re
ensure the best timing of the movement of the press and
spective initial position thereof after movement in the
consequently a more speedy and reliable operation
operating direction of the ram and the material carrier
35 has been stopped by the ram and carrier stopping ar
thereof.
Another object of the invention is the provision of a
rangement.
stopping or blocking system that comprises a relay to be
In order that the present invention may be readily
energized each `time when, for any possible reason, the
carried into effect, it will now be described with refer
synchronism of the control devices is upset, and par
ence to the accompanying drawings wherein:
ticularly in case of interruption of the synchronism be
tween the movements of press and carrier. Blocking
or stopping is to be provided also in case the press die
or mold, carried by the carrier, does not retake its pre
scribed position in the press area at the end of the for
ward stroke or movement of the carrier.
Presses of the type set forth are conventionally
equipped with an actuating bar movable from an idle
position into positions causing engagement of the friction
drive means `for downward and upward movement of the
press ram, respectively, and controlled by an electro
magnet acting against a return spring.
Another object of this invention is the use o-f means
influencing the grid potential of `an electron tube in
serted in the circuit of `the magnet that controls through
the above-mentioned actuating bar the downward stroke
of the press ram, in order to maintain the current con
stant in said magnet circuit regardless of a variation of
the voltage in the feeding power line.
Still another object of this invention is the provision
FIG. 1 is a side view of a conventional friction drive
press, drawn in dotted lines, in combination with an
embodiment of the controlling contacts for the directing
relays of the present invention;
FIG. 2 is a schematic diagram of an embodiment of
an electric circuit comprising the relays and pertaining
contacts, that control the various movements of the press,
and including the directing relays and the stopping or
blocking relays; and
FIG. 3 is a schematic diagram of an embodiment of a
circuit for controlling and regulating the current for the
magnet.
Referring now to FIG. l, the yfriction drive press to
which are applied the improvements according to this
invention comprises two friction discs 1 in spaced loca
tion opposite each other and mounted on a common shaft
journallcd with axis of rotation 1’ in the frame Z of the
press itself.
In the space between said two discs l. is rotatably sup
ported by said frame 2 a friction wheel 3, at right angles
of electronic circuits operating alternatively by influenc 60 to the discs l and coupled with a spindle or screw 4’
ing the grid potential of the electron tube inserted in the
circuit of said magnet, »and causing an intensive initial
current for energizing the magnet and in this way caus
ing through said actuating bar the displacement of the
driving discs of the press into engaging position, and a
reduced current for the whole period of time in which
acting on the press ram 5’ so that the latter is controlled
for its downward and upward movements, respectively de
pending upon the direction of rotation of said wheel 3.
Discs are displaceable in the longitudinal direction of
i the axis l' of their shaft so as to be put into engagement
alternatively with one or the opposite side of the wheel
3, in order to rotate said wheel in the respective direction
In accordance with lthe present invention, a combined
of rotation, depending upon with which one of said discs
operating and actuating arrangement for a press includes
l the wheel is infrictional engagement, with the purpose
70
a Support portion >for a workpiece and a press ram and
of thus causing the upward or downward movement of
a material carrier. The press ram and the material car
the press ram 5', respectively. rThe displacement of said
the magnet is kept energized.
spoof/e2
discs l is controlled by metns of an actuating bar (not
shown) that through the action of a return spring (not
shown) tends to maintain in engagement the one disc
for causing an upward stroke of the rain 5’. For the
do-wnward stroke of the same there is provided a magnet
that, by acting upon said actuating bar causes, against
the action of said spring, the displacement of the discs in
a manner that the other disc l engages the wheel 3 and
thus causes rotation of said wheel in the opposite direc
tion.
The rain 5’ is thus mounted reciprocably in operating
direction from an initial position spaced from the sup
port portion for a workpiece at the base of the apparatus
to an operating position in the region of the support por
tion and in return direction from the operating position
to the initial position. The ram 5’ is automatically moved
by the discs l and wheel 3 in the operating direction to
ward the support portion and in the return direction away
from the support portion.
Mounted for vertical movement jointly with screw 4'
of the press is a control bar 4 that is carried by the arm 5.
The control bar 4 controls by means of an attached
earn 6 four contacts l, la, ll, lla. The control bar 4 con
trols by means of a second cam 7, which is displaceable
for a predetermined limited distance along said control
bar, the opening and closing of a contact Cs. When the
cam '7 moves downward with the control bar 4, said
cam opens the contact Cs and when said cam moves up
ward with said control bar, the said cam closes said con«
tact.
The control mechanism comprising the contacts I, In,
ll, lla and Cs, and the control bar 4 are mounted, as
shown in FlG. l, in proximity to the press to enable ver
A,
Cs to close, whereby relay RS is energized and contacts»
lRS, ZRS and QRS are closed, the following situation eX-v
'
: rl`he cam 6 also moving upwardly causes the closure
of contact l, so that Contact ZRS being closed, the di-A
recting relay Rl-l is energized. The relay Rl-l thenv
closes the contacts lRl-ll and SRLÄ, and opens contact'
QLRt-l. Contact ltRl-il closes the circuit of »the actuat
ing relay Rl-ól, which, upon being energized, moves con
tacts A1 and Bl of the electronic circuit (FlG. 3), thus
causing the closure o-f the circuit of the electromagnet
mentioned above.
The magnet, upon being energized,
causes, as described, the displacement of the discs 1 for
causing downward movement of the ram 5’. Simultane
ously with the ram, the control bar 4 moves downwardly
and with it cam 7 so as to cause the opening of contact
Cs, thus interrupting the energization of relay RS where
by contacts ERS and lRS are again opened, while relay
'Rl-l remains energized due to the holding circuit estab-f
lished by the still closed contact la and the contact ZàRl-l.
'Participating in the downward movement of the press
ram 5', control bar d, through cam 6, causes the opening
of contact la, thereby deenergizing relay Iii-l. Conse
quently, contact SRl-l opens, contact 2R1-1 is closed
again, and contact lRl-l is opened, thus interrupting
the energization of actuating relay R143», and thereby
causing the interruption of the magnet circuit at A1 and
Bl (FlG. 3).
Since the magnet 8 is then deenergized, the above~
mentioned return spring can move the actuating bar so as
30 to move the discs 1 in opposite direction for causing an
engagement of the friction drive for the upward stroke
of the ram 5’. Notwithstanding this situation, the press,
although under a braking effect between the friction drive'
members, continues by inertia and> weight its downward
tical movement of the screw il’ and therefore vertical
movement until a first compression is effected in the mold,
movement of the press ram 5’ to produce vertical move 35
while cam 6 during this continued movement operates,
ment of said control bar in the corresponding direction.
The closing and opening of contacts Cs caused by
the cam 7 serves to close or respectively to open the cir
or closes, the contacts IIa and H, although without any
effect due to the contacts ZRS and SR1-2 being open.
Thus, the press ram 5', after having causedv said lirst com
cuit of a sensing relay RS in order to place the circuits
pression, and having consumed the downward directed
of said contacts I, la, Il, lla into operative or non-opera 40 force of inertia, will be moved upwards. Thus, ñrst Csi
tive condition, respectively, for the hereinafter explained
is closed by the upward movement of cam 7 and accord
reason, and in order to control stopping or blocking cir
ingly relay RS is energized to close Contact IRS (but
cuits described below.
without any effect, because contact SR1-1 is open) and
'l'he function and operation of the above«described ar~
contact ZRS will close. During the continuation o-f the
rangement will be explained with reference to FlGS. l
upward movement of ram 5', cam 6, which had reached
and 2.
a position 6', closes the contact II that can now close
ln the diagram of FIG. 2, the coils of the individual
the energization circuit of relay Rit-2, which circuit also
relays are indicated by circles with a reference symbol
includes a con-tact ItRî-S, which, however, is closed.
like Rl, RS, RL-li, lll-2, etc. inscribed. The switch con
Relay lll-2 closes the contact lRl-Z obtaining a hold
tacts operated by the individual relay coils are shown,
ing current as well as contact ZRl-Z (for energizing the
for the sake of clarity of the diagram, separated from the
actuating relay Rî-d) `and also closes contact 3111-2.
coils, and in “normal position,” marked with reference
Through this energization of relay R1~4 the magnet 8
symbols containing the symbol of the pertaining relay
(FIG. 3) is energized so that the friction discs are again
plus an added numeral indicating that the particular
displaced for causing engagement of the friction drive
contact is the iirst, second, etc., contact of that relay,
for the downward stroke of the ram 5’. The ram is
eg. llRl-ll, ZELL Sill-l. lf no numeral is added to
thereby reversed to downward movement. During this
the contact reference symbol, then the relay reference
movement, Cs is opened by cam 7 and relay RS is de
symbol marking a Contact indicates that it is the only
energized again so as to close Contact SRS. During this
` Contact of the particular relay.
As shown, contacts l, la, ll, llo are connected in cir
cuit with directing relays Ril-ll, Rll~2 and Rl-S, respec
tively, and control, through the relays Rl-l, Ril-2, and
lll-3, the actuating relay Rl-ál. Contact Cs controls the
circuit of a sensing relay RS which, when energized, op
erates through a plurality of contacts lRS, ZRS, SRS the
circuits directing relays Rit-l, Rl-Z »and Ril-3 in the
following manner.
Supposing the press is Working, and therefore the main
second downward movement of the ram 5’ contact lla is
closed so as to cause energization of relay R’l-â, that is
held energized through closed contact 2Rl~3, and opens
lill-3 thus interrupting the energization of relay Rit-2
and causing therefore the opening of contact ZRl-Z
(besides causing the other contacts of relay Rl-Z to open).
This results in the interruption of the energization of
actuating relay Rit-4l so that the magnet circuit is cut off
and the press ram 5’ is reversed to upward movement.
The upward movement of the prees ram 5’ does not cause
switch TL (FÍGURE 3) is in closed position, whereby
any action due to the operation of contact lla, because
contact _’tTL is opened and a blocking relay Rb is thus
not energized (FIG. 2) and a starting relay Rl is enen
contacts SRl-Z and SRS are open, nor any action due
gized via closed Contact ZRb so as to hold contact lill
since relay Rl~3 is still energized. "t" he relay Rl-S has
closed, and supposing the press is terminating the last
also closed contact ltRl-Èì which is connected in circuit
with contact ¿RS (that is closed due to cam 7 being in
its upper position because the ram 5’ is in its upward
portion of its upward movement so that cam 7 is carried
upward by the collar 7’ fixed to bar 4 and causes contact
to operation of contact Il, because contact llRl-â is open,
species
5
d
movement) and also with contact llRb, that is also closed,
so that the carrier or carriage relay Rc may be ener
gized by closing contact lbs, as will be explained more
in detail hereinafter.
'
As shown, the provision of the sensing relay RS greatly
simplifies the circuit, since it controls alternatively during
upward or downward movement of the press ram 5' the
circuits of the directing relays Rl-l, Rl-Z and Rl-S.
Furthermore, the sensing relay RS permits mutually in
,
in its full return position. At the same time, contact lbc
is closed again without any effect on the carrier relay Rc,
Contact lRc being open. From the preceding description,
it is evident that the automatic movement of the carrier
C31
is controlled in a remarkably simple, yet reliable manner.
A further feature of this invention is the provision of
a stopping or blocking relay Rb for manually stopping
the press at will, by pressing down, or closing, a suitable
switch button. rÍhe blocking or stopping relay Rb will
dependent positioning of said contacts l, Ia, II and Ila. In 10 also stop the press automatically when the carrier or the
particular, contact lla can be positioned at the same
level or even above contact ll (as shown in FIG. 1), and
the same can be done with contacts I and la, in order to
best utilize the inertia of the press ram 5’, without in any
way affecting the principle of its operation.
lt is to be noted that relay Rl-S at the termination of
the downward movement of the press ram 5’ has caused
mold are in danger of being crushed by the press ram.
Relay Rb is energized by contact lTL (FIGS. 2 and 3)
which is closed when switch TL is open. When the press
is put in operation and TL is closed, said contact ÍTL
is open so that the stopping or blocking relay Rb may be
deenergized by manual operation of a button Mc to open
contact lMc, whereby relay Rb is disconnected even if
the closure of contact 3R1-3, thus permitting contact
contact âRb, in series therewith, should be closed tending
lbs to close the circuit of the carrier or carriage relay
to hold relay Rb in energized condition. Relay Rb can
Rc. Contact libs together with contact Zbs constitute 20 then be energized at any time by pressing a stop switch
a double contact bs which is controlled by the rod 9
(FlG. l). The rod 9 is operatively connected with mov
able parts of the mold or press and is therefore lifted
after every pressing operation, by means of a mechanical
device controlled by the press itself, for the purpose of
electing the molded or pressed product. The rod 9
stoves the double Contact bs by means of a projection
button Pa in order to block or stop the press at will, due
to the fact that stop switch button Pa actuates contact lPa
together with contact ZPa for energizing; the relay Rb
and simultaneously disconnecting the starting relay Rl.
An automatic energization of stopping relay Rb occurs
in two particular cases in which contact 2bs is closed.
The first case occurs when rod 9 and double contact bs
or ring it) to its closed position during its upward stroke,
(FIG. l) are not moved to normal position after the
press ram 5’ has completed its upward stroke or when
its low position.
30 the mold does not return to normal condition after the
The closure of contact lbs causes therefore the ener
ejection of a molded object, in which case contact Zbs
gization of the carrier or carriage relay Rc so as to close
which was closed at the beginning of the downward
Contact lRc, for holding the relay energized, and Contact
stroke of the ram, would be left in closed position. At
and opens said double Contact when it moves down to
ERC, thus closing the circuit of the relay TF. The relay
TSF, when energized, closes Contact lTF, thereby ener
gizing coil .l5 of an electromagnetic friction coupling
means il (FIGS. l, 2 and 3) disposed on shaft 12 of a
motor 13 which uninterruptedly rotates, and the pur
the same time, relay RS, due to closing of contact Cs
during the downward stroke, closes Contact SRS. Con
tacts Zbs and SRS, connected in series, in the above
mentioned case, close the circuit of stopping relay Rb,
thereby energizing it with the effect of stopping the press
pose of which is to impart a forward movement to
as described below.
the carrier or carriage M» (FlG. 1) through a suitable 40
The second case of automatically stopping the press
occurs when the feeding `of the powdered material to be
crank device (not shown). The forward movement of
the carrier or carriage 14 is controlled by cam 16, ro
tated in coordination with said movement, and which is
provided with a recess or step in order to permit the re
turn of the second double Contact bc to the position shown
in FlG. l which, in this normal position will maintain
contact îbc closed. When the contact tbc is closed, the
carrier relay Rc holds itself in energized condition, the
contact 2bn being also maintained thereby in open posi
tion (FiG. 2). As soon as cam lo beUins to rotate, the
second double contact bc is moved so that contact 2bn
pressed is not uniform or is insuflicient, so that the
press ram 5’ moves downward in operating direction dur
ing the pressing operation to an excessive extent, beyond
the predetermined level, and the space (or thickness of
compressed material) between the upper press member
of the press die and the bottom of the mold would be
unduly reduced. Thus, in order to avoid damaging the
mold cavity, and also in order to ensure uniformity of
the product in the aforesaid eventuality, the press is pro
vided with a limit contact bt, (FIGS. 1 and 2) which is
actuated and closed by the press ram 5' when its stroke
will close, thus feeding current to relay TF, while contact
îbc opens in order to deenergize the carrier relay Rc.
is excessive, so that the stopping relay Rb is energized
Deenergization of the carrier relay Rc causes contacts
and then remains closed through holding current provided
lRc and ZRc to open, while the holding current through
by the closing of the Contact 3Rb connected in series with
the relay TF maintains the connection for a whole turn
the now closed control contact îlvl'c. Whatever may be
of cam lo, corresponding to a full cycle of movement of
the cause of energization of relay Rb, it will move both
contacts lRb and ZR!) to open position. Contact ZRb
the carrier, i.e. for its forward and return stroke. The
material carrier l@ is thus automatically reciprocably
opens the circuits of the relays Rl, RS, Rl-l, 'Rl-2, Rî-E':
moved in the operating direction from an initial position Gt) and Rit-4, so that by the interruption of the circuit of
spaced from the support portion at the base of the ap
magnet 8 (FlG. 3) a downward stroke of the ram is
paratus to an operating position in the region of the sup
prevented or stopped. Contact lRb is opened and causes
thereby interruption of the energization of the carrier
port portion and in the return direction from the operat
ing position to the initial position, said carrier moving
relay Re so that in case that the carrier relay should
have been in energized condition the contacts lRc and
toward the support portion in the operating direction and
ítlìc would be opened. ln any case, the carrier lit being
away from said support portion in the return direction.
in motion and contact Zbc therefore being closed, the
Contact Zbc therefore ensures the return of said carrier,
even when, for whatever reason, the press is stopped, or
carrier will continue its movement until it reaches the
when all other circuits are interrupted.
end of its return travel in which moment cam 16 returns
At the termination of a complete rotation of cam 16,
to normal position and contact Zbc opens again. Thus,
contact bc will move back to normal position, opening
whatever should be the instant when the: press ram is
contact Zbc and therefore, by interrupting the energize
stopped, contact Zbc assures that the carrier i4 will con
tion of relay TF, contact bc causes contact lTF to open
and to deenergize the circuit of coil l5 so as to disengage
the friction coupling means ll and to stop the carrier 14
tinue its movement until it reaches the position that
corresponds to the idle condition of the press, whereby
the carrier is protected against any damage.
3,0
A subsequent starting of the carrier 14 is not possible
in such situation because of the fact that the now open
contact 1R15 (stopping relay Rb being energized) pre
having been connected'in the enode cathode circuit of
tube V1 by contact Bi in its second position. The tube
V5 provides for the iiow of current in resistance R1 there
by causing a voltage drop that reduces the voltage original
quently any operation of the carrier 14 is prevented. ln Cn ly supplied by circuit B, so -that the voltage that results
from the series-connection of the circuits A and B becomes
order to restart the operation of the press, it is neces
zero or even negative to a certain degree. The reduced
sary to interrupt the energization of stopping relay Rb
voltage is applied as bias to the grid of tube V1, and may
by pressing down the control button Mc, the contact 1Mo
finally ‘oe adjusted to a desired value through the po`
of which opens and thus interrupts the holding circuit 0f
tentiometer P3. At this point, therefore, the current
relay Rb, while at the same time the contact 2Mc closes
in the circuit of the magnet S diminishes, and remains the
the circuit for carriage relay Rc and thus provides for
same until the contacts A1 and B1 return to the normal
the start of operation of the carrier 14. Thereafter, it is
position as shown. At the moment when the contacts A1
possible to start the press again, by pressing down both
vents the energization of the carrier relay Rc and conse
the buttons Pc connected in series (for safe two-hand
operation) and thereby energizing the starting relay Rl
which holds itself energized through the holding contact
ZRI and the stop switch contact ZPa.
and B1 return to their normal position, the condenser CL
discharges across resistance R2. ri`he above described
circuit not only regulates the magnet current, but also
serves in accordance with the invention to control the con
stancy of the current in the circuit that comprises magnet
Another feature of this invention is the provision of a
coil 8, tube V1 and transformer T1, by adjusting the
device for the regulation of the current in the circuit of
the actuating magnet 8. Referring to FIG. 3, which is to 20 voltage supplied by the power line at L. in fact, when a
variation or fluctuation of the line voltage occurs, the
be understood to be an extension of the circuit arrange
potentiometer P1 will cause a variation of voltage in
ment of FIG. 2, the line ends x’, y’ of FIG. 3 being con«
proportion with that occurring in the power line. The
nected with the line ends x, y, respectively, of FIG. 2,
sliding tapping point of the potentiometer P1 transmits in
there is provided in the electric power line L a main
this way to potentiometer P3 a varying voltage, so that,
switch TL. The switch TL permits the energization of the
when A1 is switched to connect the output of the circuits
carrier drive motor 13, and permits the energization of
A and B in series, the difference between the voltages sup
the electromagnet 8 through the secondary switch TL,
plied by circuits A and B, after the tube VS has become
via a transformer T1. A single phase portion of the
conductive, will result in causing the potential of the grid
electric line power is used for feeding all the devices
operating on direct current.
To this end, a transformer 30 relative to the cathode of tube V1, to become almost zero
T4 is fed with A_C. in order to feed D.C. through the
or slightly negative, as hereinabove explained. supposing
that the voltage of the network drops, then a proportional
drop of voltage will occur across the potentiometer P1.
RAS. A seco-nd transformer T3, which is provided with
This reduction of voltage across potentiometer P1 will
two secondary windings, feeds two circuits A and i3.
Connected in the circuits A and B are respectively the 35 reduce the negative voltage at 17 so that the positive
voltage supplied by circuit B at 18 is counteracted to a
rectitiers RA1 and RAZ, at the output of which the cur
lesser degree and a positive voltage is applied to the
rent is smoothed by the condensers C1 and C2, respec
grid of tube V1, thus establishing in the circuit T1, V1, 8
tively, in order to properly feed the discharge tubes V2
the normal operating conditions that prevailed at normal
and Vd, which cause a constant voltage drop. A potenti~
ometer Pi is connected in series with tube V4 for ad 40 line voltage, i.e. before said drop thereof. Of course, in
the case of an increase of the line voltage the positive
justing the operating voltage between terminal 17 and
potential from circuit B will be more effectively overcome
the terminal 1S of contact A1 of relay R1-4 mentioned
by the negative bias voltage furnished by circuit A and
above. The voltage taken from potentiometer P1 is fur
therefore the bias voltage of the grid will vary by becom
ther reduced by a potentiometer P3, to the sliding tapping
ing more negative and thus diminish the conductivity of
point of which terminal 18 of contact A1 is connected.
V1, and thus again keep the voltage applied to the magnet
In the deenergized position of relay R1-4 (FIG. 2),
coil 8 at the desired constant level.
contacts A1 and B1 are positioned as shown in FIG. 3,
and the grid of tube V1 of the magnet circuit remains
Of course, the a-bove-mentioned improvements may
also -be realized in a diiferent manner than that herein
biased with negative voltage as determined by the po
tentiometer P3 and supplied by the circuit A that is made t above described, by a modification of the electric circuits
described in detail, without departing from the gist and
stable by the discharge tube V4. In this condition of the
scope of this invention.
arrangement, there is no current in the circuit of the
Without further analysis, the foregoing will so fully
magnet 8, due to the opposing potential of the grid of
reveal the gist of the present invention that others can by
tube V1. Upon energization of actuating relay .R1-4,
applying current knowledge readily adept it for various
contacts A1 and B1 are removed to a second position.
applications without omitting features that, from the
Contact A1 disconnects the circuit A from the cathode
standpoint of prior art, fairly constitute essential char
of tube V1 in favor of the circuit B that suppiies a posi*
acteristics of the generic or specific aspect of this inven
tive voltage at terminal i8 which opposes that supplied
by the circuit A. The voltage supplied by circuit B via
tion and, therefore, such adaptations should and are in
the connection 13, 17 is now less negative than that sup 60 tended to be comprehended within the mea-ning and range
of equivalence of the following claims.
plied before by the circuit A or even positive, so that at
the grid of tube V1 there is applied a voltage that is
What is claimed as new and desired to be secured by
suíiiciently more positive to ensure the maximum conduc
Letters Patent is:
tivity of tube V1. So in this first phase of operation, there
l. A combined operating and actuating arrangement
is available instantaneously in the circuit of tue magnet
for a press including a support portion for a workpiece,
circuit x, x’/y, y’ to the relay by means of a rectifier
coil 8 as intensive a current as is required to produce in
the magnet the necessary force for attracting and operat
ing the actuating bar.
Contact B1, which is also operated by the coil of actuat~
ing relay lll-4, connects, when moved from the shown
position of rest into its second position, in the circuit B
the condenser CL which is charged within a period of time
that depends upon the positioning of potentiometer P2,
thereby reaching after a certain delay a potential that is
suiiicient to render the tube V5 conductive; the tube V5 '
press ram means and material-carrier means, each of
said press ram means and said material-carrier means
being mounted reciprocabiy in operating direction from
an initial position spaced from said support portion to
an operating position and in return direction from said
operating position to said initial position in the region
of said support portion said combined operating and
actuating arrangement including
ram advancing means for automatically moving said
adegua
9
10
ram means along a ram path in said operating di
yond a predetermined point during its movement in
operating direction along said ram path;
rection toward said support portion;
ram return means for automatically moving said ram
means along said ram path in said return direction
operating means associated with said tirst and second
actuating means and adapted to operate said ram
stopping means and said carrier blocking means
simultaneously the moment said ram means passes
away from said support portion;
carrier advancing means for automatically moving said
material-carrier means along a carrier path in said
during its movement in operating direction said pre
operating direction toward said support portion;
determined point of said ram path after said ma
terial-carrier means passes during its movement said
predetermined point of said carrier path so as to
carrier return means for automatically moving said
material-carrier means along said carrier path in said 10
return direction away from said support portion;
ram stopping means associated with the ram advanc
stop advance movement of both said ram means and
15
said material-carrier means when after passing of
said material carrier means along said carrier path
beyond said predetermined point thereof said ram
means passes along said ram path beyond said pre
automatically when said material-carrier means
passes beyond a predetermined point during its move 20
means for automatically operating said ram return
means and said carrier-return means after operation
of said ram stopping means and said carrier stop
ping means.
ing means for stopping upon operation advancing
movement of said ram advancing means;
carrier stopping means associated with the carrier ad
vancing means for stopping upon operation advanc
ing movement of said carrier advancing means;
determined point thereof; and
first actuating means constructed so as to be actuated
ment in operating direction along said carrier path;
3. A combined operating and actuating arrangement
second actuating means constructed so as to be actu
for a press including a support portion for a workpiece,
ated automatically when said ram means passes be
press ram means and material-carrier means, each of said
press ram means and said material-carrier means being
yond a predetermined point during its movement in
operating direction along said ram path; and
mounted reciprocably in operating direction from an ini
tial position spaced from said support portion to an op
operating means associated with said first and second
actuating means and adapted to operate said ram
stopping means and said carrier stopping means si
erating position in the region of said support portion and
in return direction from said operating position to said
initial position, said combined operating and actuating ar
multaneously the moment said ram means passes
during its movement in operating direction said pre
30
determined point of said ram path after said ma
terial-carrier means passes during its movement said
predetermined point of said carrier path so as to
rangement including
electrically energized driving means for driving said
ram means;
stop advance movement of both ram means and
said material-carrier means when after passing of 35
said material-carrier means along said carrier path
lbeyond said predetermined point thereof said ram
means passes along said ram path beyond said pre
:determined point thereof.
2. A combined operating and actuating arrangement 40
'ifor a press including a support portion for a workpiece,
electrical supply means for electrically energizing said
driving means;
ram advancing means for automatically moving said
ram means along a ram path in said operating direc
tion toward said support portion;
a ram return means for automatically moving said
ram means along said ram path in said return direc
tion away from said support portion;
carrier advancing means for automatica ly moving said
press ram means and material-carrier means, each of
‘jsaid press ram means and said material-carrier means
material-carrier means along a carrier path in said
being mounted reciprocably in operating direction from
an initial position spaced from said support portion to
an operating position in the region of said support por
carrier return means for automatically moving said
material-carrier means along said carrier path in said
return direction away from said support portion;
operating direction toward said support portion;
tion and in return direction from said operating position
to said initial position, said combined operating and ac
ram stopping means associated with the ram advanc~
ing means for stopping upon operation advancing
, tuating arrangement including ,
movement of said ram advancing means;
ram advancing means for automatically moving said
carrier stopping means associated with the carrier ad
ram means along a ram path in said operating direc
vancing means for stopping upon operation advanc
ing movement of said carrier advancing means;
tion toward said support portion;
ram return means for automatically moving said ram
means along said ram path in said return direction
first actuating means constructed so as to be actuated
away from said support portion;
carrier advancing means for automatically moving said
passes beyond a predetermined point during its
movement in operating direction along said carrier
automatically when said material-carrier means
path;
material-carrier means along a carrier path in said
operating direction toward said support portion;
second actuating means constructed so as to be ac
carrier return means for automatically moving said
material-carrier means along said carrier path in
said return direction away from said support por
tuated automatically when said ram means passes
beyond a predetermined point during its movement
in operating direction along said ram path;
operating means associated with said first and second
tion;
actuating means and adapted to operate said ram
stopping means and said carrier stopping means si»
ram stopping means associated with the ram advanc
ing means for stopping upon operation advancing
movement of said ram advancing means; `
65
vancing means for stopping upon operation advanc
ing movement of said carrier advancing means;
ñrst actuating means constructed so as to be actuated
automatically when said material-carrier means
passes beyond a predetermined point during its move«
ment in operating direction along said carrier path;
second actuating means constructed so as to be actu
Y ated automatically when said ram means passes be
muitaneously the moment said ram means passes dur
ing its movement in operating direction said pre
determined point of said ram path after said mate~
rial-carrier means passes during its movement said
predetermined point of said carrier path so as to
carrier stopping means associated with the carrier ad
70
stop advance movement of both said ram means and
said material-carrier means when after passing of
said material-carrier means along said carrier path
beyond said predetermined point thereof said ram
means passes along said ram path beyond said pre
75
determined point thereof;
3,969,742
11
means; and
electrical control means interposed between said driv C21
ing means and said electrical supply means for pro
iding an initial energizing current of sufficient
magnitude to start actuation of said driving means
for driving said ram means in operating direction
and for reducing the energizing current after actua
tion of said driving means to a substantially lower
magnitude suñicient to maintain actuation of said
to said ram means andconnected in said control cir
cuit means with said relay switch means in a man
ner whereby said control contact switch means con
trol the energization of selected ones of said relay
switch means, direction-sensitive switch means
mounted in proximity to said ram means and con
nected in said control circuit means with said sens
ing relay switch means in a manner whereby said
direction-sensitive switch means controls the ener
gization of said sensing relay switch means, and
switch control means for controlling the operation
driving means.
4. A combined operating and actuating arrangement
of said control contact switch means and said direc
tion-sensitive switch means in accordance with the
for a press including a support portion for a workpiece,
press ram means and material-carrier means, each of
said press ram means and said material-carrier means
movement of said ram means;
means for automatically operating said ram return
means and said carrier return means after operation
of said ram stopping means and said carrier stop
being mounted reciprocably in operating direction from
an initial position spaced from said support portion to
an operating position in the region of said support por
tion and in return direction from said oeprating position
ping means; and
to said initial position, said combined operating and ac
tuating arrangement including
electrically energized driving means for driving said
ram means;
l1.2
tion of said sensing relay switch means, said ñrst and
second actuating means comprising a plurality of
control contact switch means mounted in proximity
means for automatically operating said ram return
means and said carrier return means after operation
of said ram stopping means and said carrier stopping
FC Gl
electrical supplying means for electrically energizing
said driving means;
ram advancing means for automatically moving said
ram means along a ram path in said operating direc-
tion toward said support portion;
ram return means for automa 'cally moving said ram
means along said ram path in said return direction
away from said support portion;
carrier advancing means for automatically moving said
material-carrier means along a carrier path in said
operating direction toward said support portion;
carrier return means for automatically moving said
material-carrier means along said carrier path in said
return direction away from said support portion;
ram stopping means associated with the ram advinc
ing means for stopping upon operation advancing
movement of said ram advancing means;
carrier stopping means associated with the carrier ad»
vancing means for stopping upon operation advanc
ing movement of said carrier advancing means;
iirst actuating means constructed so as to be actuated
automatically when said material-carrier means
passes beyond a predetermined point during its
movement in operating direction along said carrier
path;
second actuating means constructed so as to be ac~
tuated automatically when said ram means passes
beyond a predetermined point during its movement
in operating direction along said ram path;
operating means associated with said first and second
actuating means and adapted to operate said ram
stopping means and said carrier stopping means si
multaneously the moment said ram means passes
during its movement in operating direction said pre~
determined point of said ram path after said mate GO
rial-carrier means passes during its movement said
predetermined point of said carrier path so as to
stop advance movement of both said ram means and
said material-carrier means when after passing of
said material-carrier means along said carrier path
beyond said predetermined point thereof said ram
means passes along said ram path beyond said pre
determined point thereof, said operating means com
prising control circuit means energized by said elec
trical supply means, a plurality of relay switch means 70
connected in said control circuit means and sens
ing relay switch means connected in said control cir
cuit means with said relay switch means for con
trolling the energization of selected ones of said
relay switch means in accordance with the energiza- f
i
electrical control means interposed between said driv
ing means and said electrical supply means for pro
viding an initial energizing current of sui'licient
magnitude to start actuation of said driving means
for driving said ram means in operating direction
and for reducing the energizing current after actua
tion of said driving means to a substantially lower
magnitude sufficient to maintain actuation of said
driving means.
'
5. A combined operatingvand actuating karrangement
for a press including a support portion for a workpiece,
press ram means and material~carrier means, each of said
press ram means and said material-carrier means being
mounted reciprocably in operating direction from an ini
tial position spaced from said support portion to an 0p
erating position in the region of said support portion and
in return direction from said operating position to said
initial position, said combined operating and actuating ar
rangement including
electrically energized driving means for driving said
ram means;
electrical supply means for electrically energizing said
driving means;
ram advancing means for automatically moving said
ram means along a ram path in said operating direc
tion toward said support portion;
ram return means for automatically moving said ram
means along said ram path in said return direction
away from said support portion;
carrier advancing means for automatically moving said
material-carrier means along a carrier path in said
operating `direction toward said ysupport portion;
carrier return means for automatically moving said
material-carrier means along said carrier path in
said return direction away from said support portion;
ram stopping means associated with the ram advancing
means for stopping upon operation advancing move
ment of said ram advancing means;
carrier stopping means associated with the carrier ad
vancing means for stopping upon operation advanc
ing movement of said carrier advancing means;
first actuating means constructed so as to be actuated
automatically when said material-carrier means
passes beyond a predetermined point during its
movement in operating direction along said carrier
path;
second actuating means constructed so as to be ac
tuated automatically when said ram means passes
beyond a predetermined point during its movement
in operating direction along said ram path;
operating means associated with said ñrst and second
actuating means and adapted to operate said ram
stopping means and said carrier stopping means si
multaneously the moment said ram means passes
3,069,742
13
during its movement in operating direction said pre
determined point of said ram path after said mate
rial-carrier means passes during its movement said
predetermined point of said carrier path so as to
stop advance movement of both said ram means and
said material-carrier means when after passing of
said material-carrier means along said carrier path
beyond said predetermined point thereof said ram
means passes along said ram path beyond said pre
determined point thereof, said operating means com 10
prising control circuit means energized by said elec
trical supply means, a plurality of relay switch means
connected in said control circuit means and sensing
relay switch means connected in said control circuit
means with said relay switch means for selectively 15
rendering selected ones of said relay switch means
operable and for selectively rendering selected ones
of said relay switch means inoperable in accordance
with the energization of said sensing relay switch
means, said lirst and second actuating means com 20
prising a plurality of control contact switch means
mounted in proximity to said ram means and con
nected in said control circuit means in a manner
whereby said‘control Contact switch means control
the operation of selected ones of said relay switch 25
means, said control contact switch means being
adapted to be opened and closed to respectively open
and close corresponding ones of said relay switch
means, direction-sensitive switch means mounted in
proximity to said ram means and connected in said 30
control circuit means with said sensing relay switch
means in a manner whereby said direction-sensitive
switch means controls the operation of said sensing
relay switch means, said direction-sensitive, switch
means being adapted to be opened and closed t0 re 35
spectively deenergize and energize said sensing relay
switch means, and switch control means for control
ling the operation of said control contact switch
means and said direction-sensitive switch means in
accordance with the movement of said ram means, 40
ifi
said switch control means comprising a control mem
ber carried by said ram means and positioned in op
erative proximity to said control contact switch
means and to said direction-sensitive switch means
in a manner whereby said control member opens
and closes selected ones of said control contact switch
means and thereby opens and closes the correspondY
ing relay switch means connected in said control cir
cuit means with said control contact switch means
in correspondence with the movement of said ram
means through a plurality of positions during re
ciprocation thereof and whereby said control mem
ber opens said direction-sensitive switch means there
by deenergizing said sensitive relay switch means in
correspondence with the movement of said ram means
in operating direction and closes said direction-sensi
tive switch means thereby energizing said sensing
relay switch means in correspondence with the move
ment of said ram means in return direction;
means for automatically operating said ram return
means and said carrier return means after operation
of said ram stopping means and said carrier stopping
means; and
electrical control means interposed between said driv
ing means and said electrical supply means for pro
viding an initial energizing current of suñìcient mag
nitude to start actuation of said driving means for
driving said ram means in operating direction and
for reducing the energizing current atter actuation
of said driving means to a substantially lower mag
nitude suiììcient to maintain actuation of said driv
ing means.
References Cited in the ñle of this patent
UNITED STATES PATENTS
2,674,008
Van der Pyl ___________ ___ Apr. 6, 1954
2,712,168
2,770,862
2,803,852
2,923,973
Kenline ______________ __ July 5,
Miller ______________ __ Nov. 20,
Cook _______________ __ Aug. 27,
Winneman ____________ -__ Feb. 9,
1955
1956
1957
1960
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