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Патент USA US2405640

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.
E. CANNON
-
M?PARATUS ?FOR CONTROLLING THE SLIDE MOVEMENT
'
2,405,640
IN LONG-BED HYDRAULIC PRESSES
Filed 'May '15; ?1943
4 Sheets-Sheet? 1
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?$924 Can/Mo? -?
?BY
$753
gATTORNEYS
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Aug. E3, 3946.
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E. CANNON
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APPARATUS FOR CONTROLLING THE SLIDE MOVEMENT
IN LONG-BED HYDRAULIC PRESSES
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Filed May 15, 1943.
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4 Sheets-Sheet 2
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E. CANNON
APPARATUS FOR CONTROLLING FTHE SLIDE MOVEMENT
IN LONG-BED HYDRAULIC PRESSES
Filed May 15, 1943
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.INVENTOR
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ATTORNEYJ
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E. CANNON
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2,405,640
, APPARATUS FOR CONTROLLING?THE SLIDE MOVEMENT
IN'LONG-BED HYDRAULIC ,PRESSES
Filed May 15, 1943
'
_
I 4 Sheets-SheetA _
' INVENT0R4
Patented Aug. 13:, 1946
UNITED STS PTNT
2,405,640
APPARATUS FOR CONTROLLING THE SLIDE,
MOVEMENT IN? LON G-BED HYDRAULIC
PRESSES
Earl Cannon, Rockville Centre, N. Y., assignor to
E. W. Bliss Company, Brooklyn, N. Y., a corpo
1
ration of Delaware
Application May 15, 1943, Serial No. 487,106
25 Claims. (01.,100-71)
2
This invention relates to improvements in ap
paratus for controlling the slide movement in
long-bed hydraulic presses, and more particular
ly relates to self-modifying controlling means for
maintaining the slide of such a press substantial
ly in parallelism with the press bed during the ad
vance or closing movement of said slide despite
any die or blank irregularity which might tend to
induce tilting of the slide.
the provision of electrical compensating means
which are initially rendered effective to commence
compensation in the volumes of liquid supplied
to several such advance chambers in response to
a slight departure of the press slide from par
allelism and to give to such controlling means a
self-modifying eifect, rendering the compensat
ing means eiiective only to the extent necessary
to offset the effect of the forces tending to up
Any reference in the following speci?cation and 10 set the parallelism of the press slide, so that rock
claims to ?parallelism? or ?non-parallelism? is
ing of the latter during its advance stroke may
intended to relate to the attitude of the press slide
relatively to the bed of a press. ?Substantial
parallelism? is intended to include a minor de
be obviated or minimized.
A further object is to provide a self-modifying
compensating arrangement, of the character men
tioned in the preceding paragraph, which is sim
ple and highly sensitive, both in responding to
gree of non-parallelism which is within permis
sible practicable limits. The term ?long-bed hy
draulic press? refers to any hydraulic press
non-?parallelism of the press slide in commenc
wherein the present invention may be employed
ing its compensating e?fect and in limiting the
advantageously to maintain such substantial par
degree of compensation to that which will cause
allelism.
20 the press slide to advance with little or no rock
In my co-pending Patents 2,353,388 and
ing effect.
2,353,339, issued July 11, 1944, there are disclosed
The foregoing and other objects are achieved
electrical means, for maintaining substantial par
according to the present invention by providing
allelism of a slide of a long-bed press, wherein
a compensating pumping mechanism which may
contro1 is exerted to e?ect compensation in the 25 be automatically adjusted to vary the relative vol
volumes of liquid delivered to ram advance cham
umes of liquid pumped to ram advance chambers
bers toward opposite sides of a long-bed press.
toward oppositesides of a press slide; controlling
In the embodiments illustrated in the said co
means responsive to non-parallelism of the press
pending patents, only two diiierent stages or de
slide and adapted to initiate a change in the
adjustment of the said pumping mechanism to
grees of compensation are provided. This ar
rangement usually affords somewhat more or less
cause the latter to eiiect a compensating varia
than the precise compensation required in a par
tion in the delivery of liquid to said chambers;
ticular case, and, hence, the compensating e?ect
and control-modifying means coacting with said
may be intermittent during the down stroke of the
controlling means ?to limit the adjustment there
press'slide, thereby causing the press slide to pur 35 of to that adjustment under which the press slide
sue a rocking motion during its advance move
will be caused to continue its advance movement
ment, all as may be understood from the said
with little or no rocking movement.
patents.
More speci?cally, I provide a continuously-act
There are distinct advantages in employing
ing, reversible, variable delivery compensator
electrical means to achieve such compensation in
pump arranged so that it may increase the vol
the delivery of ?uid to advance chambers at op
ume of liquid supplied to one ram advance cham
posite sides of a press slide, and in most cases it
ber relatively to the volume of liquid supplied to
would be highly desirable to fully or at least sub
? the other; two photoelectric cells or switches ar
stantially eliminate the mentioned rocking mo
ranged so that one or the other becomes activated
tion.
or closed upon even a slight departure of the
An important object of the present invention
press slide from parallelism; a reversible electric
is to provide electrical compensating means which
motor, controlled by said cells or switches and
may yield compensation in the Volumes of liq
adapted to reversibly vary the control of said
uid supplied to ram advance chambers toward op
pump; and a mechanism actuated by the said re
posite sides of a hydraulic press slide to an ex
tent which Will cause the slide to pursue its ad
vance movement in a substantially unchanging
versible electric motor, which mechanisms, after
the proper pump adjustment is attained yielding
uniform advance movement of the press slide, is
adapted to close olT light from and thus de-acti
vate the mentioned activated cells, or to open said
and substantially parallel attitude with respect
to the press bed.
Another important object of the invention is
55 "
switches whereby to stop said motor and thus
2,405,646
3
4
terminate the variation in the compensator pump
adjustment at the proper point to derive con
tinued compensation which will enable the press
slide to continue its advance movement in sub
through pipes 30a, 38b, and discharge liquid
through pipes 31a, 3ib, and through the valves
stantial parallelism.
pipe lines 32a, 32b, to e?ect an advance or closing
movement of the press slide, or into return cham
bers 2m and 2H), which are, respectively, served
by pipe lines 33a, 33b, to achieve the return or
23a, 23b, either into the ram advance chambers
20a and 2%, which are, respectively, served by
_
For the purpose of illustrating the present in
vention, and without limiting the invention there
to, several preferred embodiments are shown in
? opening movement of the press slide. The direc
the accompanying drawings, in which:
Figure 1 is a perspective view illustrating the 10 tion of stroke of the press, of course, depends on
whether the valve pistons are in their left posi
application of either mentioned embodiment of
tion, as shown in the drawings, to achieve the ad
the present invention to a long-bed press;
vance movement, or in their right position to
Fig. 2 is a fragmentary top plan view of the
achieve the return movement. If the said pistons
press and certain portions of the apparatus shown?
are in their mid-positions, the liquid charged into
in Fig. 1;
the ?valves 23a, 231), instead of being pumped to
Fig. 3 is a sectional view of apparatus compris
the ram chambers, passes through interior pas
ing a ?rst embodiment of the invention, taken
sages (indicated in broken lines) in said pistons,
substantially cnthe lines 3?3 of Figs. 1 and 4
whence it returns to the tank through pipe lines
and illustrating the use of photoelectric cell as
semblies;
34a, 34b.
.
in design, it will be appreciated that, where re
sistance to the advance of the slide is not uni
_ Fig. 5 is a diagram illustrating the various com
ponent parts of said ?rst embodiment of the in
vention and the interconnectionof said parts; and
Fig. Gisa fragmentary elevation, partly broken
away, looking down on certain important parts of
a; second embodiment including limit switches
which may lee-employed instead of the photoelec
tric cells illustrated in the ?rst mentioned em
bodiment of the invention. .
General structure of press with? which the inven
'
tion is illustrated
'
'
,
Although the pumping systems for operating
the rams 18a, lSb, may be substantially identical
Fig.~ 4 is a vertical sectional view taken sub
stantially on the line 4-4 of Fig. 3;
25
formly distributed thereover, the different slip
pages in the two pumps, slight leakages, and pos
sibly other factors, may cause the side or end of
the press slide encountering the least resistance
to advance ahead of the other side thereof, and
this uneven advance or cocking of the slide in
many instances maybecome more pronounced as
the slide progresses toward the end of its advance
stroke. This highly undesirable cooking of the
press slide may be substantially obviated by com
Referring, ?rst, to Fig. 1: The press with which 35 pensating means nowto be described in detail.
?The compensating pumping mechanism
thelinvention is illustrated may comprise a long
bed ll provided in a base 12- suitably'tied at its
.According to the present invention, it is pre
?opposite. ends toa crown I3? by tie-rods 14 ex
ferred to provide a compensator pump 35 which
tending through slide housings 15 which serve, at
least partially, to guide a vertically reciprocating 40 may be connected in various ways to achieve the
effects of the operation hereinafter set forth. In
slide l6, and to suitably space apart the said crown
the disclosed embodiment, the said pump is con
and bed. and to maintain the two latter members
nected by a pipe 36a to the pipe 32a which carries
?xedly in their proper relationship. Tie-rod nuts
the liquid supply to ram advance chamber 20a,
I?! preferably are providedat the upper and lower
and is connected by a pipe 35b to the pipe 32b
ends (the latter are not visible in'the drawings)
of the said tie-rods.
? '3
_ The slide 16 is reciprocated inV-a' well-under-_
stood manner by rams l8a, [8b, ?xed symmetri
cally upon the slide toward opposite ends thereof.
which carries the liquid supply to ram advance
chamber 201).
y '
i
The compensator pump 35, if connected in the
manner just described, preferably should be a
These rams, as best understood from Fig. 5, may 50 continuously-acting reversible pump, suitably
driven as by an electric motor 350.. The pumping
be enlarged at their upper ends to form ram pis
mechanism of said compensator pump, further, is
tons ltd, 19b, and may be urged downwardly on
their advance strokes by liquid introduced into
advance chambers 20a, 20b, and upwardly on
their return strokes by liquid introduced into re
turn chambers Zia, Mb. The said chambers, of
the general character indicated in Fig. 5, may, of
course, be suitably formed within the crown B
of the press.
. Separate, substantially identical, pumping sys-v
tems are provided for handling the supply of liq-l
uidjfor operating each of the rams I80, and l8b.
These pumping systems function alike, and com
prise suitably driven pumps 22a, 22b, and slide
valves-23a, 231), which are constrained to func
tion in unison ?by having their pistons 24a, 24b
tied together by rods 25a, 25b, and turnbuckle
26. The said pistons may be held normally in
their mid-positions by a well-understood spring
centering device 21, and may be urged to the left
and right, respectively, by solenoids 28a, 2812,
which are connected in suitable electric circuits
adapted to control the closing and opening of
the press.
,
'
> Thesaid pumps draw liquid from a tank 29
preferably adjustable by movable means which
extend to the exterior of the pump itself'for re
.\ versing the flow of liquid through the pump and
for controlling the volume? of such flow. Although.
various types of pumps having pumping mecha
nisms conforming to these preferred character
istics may be used, a pump of the so-called ?Hele
Shaw? type, such as is illustrated and described
in my Patent 2,328,258, issued August 31, 1943, is
well suited to the purpose of the present inven
tion.
'
Adjustment? of ?ow
through the compensator
pump
As the particular pumping mechanism em
ployed in the compensator pump is not an essen
tial part of the present invention, the said pump
is not described herein in detail. It is sui?cient
to observe, for present purposes that the ?ow of
liquid through the pump 35 may be reversed, and
the volume thereof controlled, by a reciprocating
control member 31 which extends from the in
75 terior mechanism'of said pump to'the exterior
5
2,405,640
thereof and yields volume control substantially
proportionate to the extent of its movement.
The control member 3'? is operatively connected
through a link 38, a bell-crank 39, and a link 40
to a traveling nut All which is threaded upon and
adapted to travel along a suitably mounted screw
42 when the latter is rotated. The nut 4| is re
6
a conventional type is employed between the
shafts 52 and 53, as shown in Fig. 3. As illus
trated, it comprises bevel gears ?6i and 62 keyed
respectively upon the inner ends of shafts 52
and 53 and meshing with bevel differential gears
63 which are mounted within a cage 64 upon
studs 65. The cage 64, preferably, is so mounted
strained against rotation by a ?xed guide rod M
upon suitable bearings as to be capable of turn
which extends through a suitable bore in said
ing about the common axis of the shafts 52 an
nut and is retained, at its ends, in supports 42a 10 53.
'
which carry bearings accommodating the ends of
It should be apparent that if the parallelism
the screw 42. The several mentioned connections
. of the press slide I5 is maintained as it descends, '
between the control member 31 and the nut 4!
the shafts 52 and 53 move'in similar degrees
are allpivotal connections, and the bell-crank is
but in opposite directions, so that the rotation
fulcrumed upon a bracket 44 which may be
imparted to the differential gears 63 by the bevel
mounted upon the body of the compensator pump
gear 6| tending to turn the cage 54 in one direc
35. The screw 42 is constrained to turn with a
tion is exactly counteracted by the rotation im
worm-wheel "i5 keyed thereto, and the Worm
parted by the bevel gear 52 to said diii'erential
wheel is driven by a worm 45 suitably coupled to
gears tending to turn said cage in the opposite
and driven by a reversible, electric, pilot motor 41.
direction. Hence, it results that while the slide
A dual control is provided for operating the
i5 moves downwardly in parallelism with the bed
electric motor 41; ?rst, a control which starts the
I l the cage 64 remains at rest.
said motor in either direction, in order to initiate
On the other hand, if the parallelism of the
the adjusting movement of the control member
slide it is not maintained as it moves down
31, as soon as the press slide departs even slightly
wardly, one of the shafts 52, 53 turns to a greater
from parallelism and, second, a control which
degree than the other, thus, through the diifer
stops said motor as soon as the control member
ential gears 63 imparting a rotative movement to
El is moved su?iciently to yield an adjustment
the cage 55 in a direction and to an extent which
of the compensator pump 35, which causes the
depends upon the direction and extent of tilting
latter to establish and maintain a compensating 30 of the press slide.
e?ect which will cause the press slide to advance
A movable shutter member, which may be in
uniformly and without substantial rocking motion.
the form of an opaque disc 66,.is ?xed upon the
cage 64 by any suitable means as, for example,
Initiation of adjustment of the compensator
by
bolts or rivets 61, so that said disc is rotated
pump
35 with said cage in response to any departure of
the press slide from parallelism. The differential
The said ?rst control as employed in the illusw
mechanism and the disc 66 preferably are en
trated ?rst embodiment, comprises two similar
closed within a drum-like casingli? having hubs
electric circuits, one for control of the motor 41
in each direction. Although the motor 4'! may
89, which turn upon bearing members ?It?! in the
be any one of various suitable types, it is diagram 40 form of bushings which extend about the shafts
matically illustrated in Fig. 5 as having a shunt
52, 53 and are supported by the brackets 54, 55.
There preferably are provided, within the casing
winding 41a which may be in the stator of the
motor. The mentioned circuits include photo
68, two similar photoelectric cell assemblies in
electric cells 48, 49, which are respectively ar
cluding related light sources, one of which as
ranged in circuits of suitable ampli?ers 5%, 51, ' semblies is adapted to control a circuit operat
the latter, respectively, being connected separate
ing the motor 41 in one direction and the other
ly to the coils of relays 55a, 51a. These relays,
of which is adapted to control a circuit oper
through their normally open contactors 55b, 55c,
ating said motor in the other direction. In Fig. 3,?
51b, 510, control the flow and direction of iiow
there is disclosed only one of said assemblies, lo
of current through the winding lila from the two ' в cated below the central horizontal plane of the
leads, indicated by a plus and a minus sign, com
casing 65. Said assembly comprises a light source
prising a source of electric energy. Contactors
in the form of an incandescent lamp 49a: and the
50c, 510, also control unidirectional current flow
photoelectric cell 49, which, preferably, are
through the rotor of the motor Ill.
mounted respectively within separate compart
Means for controlling the passage of light to
ments ll, 12 ?xed inside the casing 68. The ad
the mentioned photoelectric cells are shown in
jacent walls of said compartments are respec-,
detail in Figs. 3 and 4 and in diagrammatic form
tively provided with aligned radial slots 1 la, 12a,
in Fig. 5. The relationship of said means to the
adapted to permit passage of light rays from
operating parts of the press may best be under
the lamp 49m to the cell 49. The compartment
stood from Figs. 1 and 2, from which it may be
12, the slot 12a, and the cell 49 of the assembly
seen that horizontal cross-shafts 52, 53, carried
are indicated in broken lines in Fig. 4.
respectively at their inner ends in bearing brack
The other of said cell assemblies, located above
ets 5d, 55, mounted upon the crown is and also
the central horizontal plane of the casing 68, may
by suitable bearing brackets located near their
be similar in all respects to the assembly de
outer ends are arranged to be rotated in opposite 65 scribed in detail in the next preceding paragraph.
directions by oppositely-facing, vertically-extend
In Fig. 4, the cell 48 in said other assembly, the
ing racks 58, 5?, which are secured at their lower
said cell?s compartment 15, and the latter?s radial
ends to opposite sides of the slide 56. These
slot 15a are indicated in broken lines, thus mak
racks, of course, move vertically with the said
ing clear the relative radial positions of the two
slide and turn the shafts 52, 53, through step~up 70 mentioned cell assemblies within the casing 68.
gear train 58 visible at the left side of the press
As best seen in Fig. 4, the opaque disc 66 is
in Fig. 1 and a somewhat similar but oppositely
provided with an arcuate concentric opening 16
acting gear train 59 as indicated diagrammati
which is of such length that its ends, in what
cally in Fig. 5.
r
may be termed a neutral position of said disc with
A di?erential mechanism 55 which may be of 75 respect to the casing 68, may extend to pointsv
2,405,640
only minutely out of register with the slots in
?8
the drum 68 progresses to the point where the
the two said assemblies so that with the said disc
slots in both photoelectric cell assemblies are in
in such neutral position no light may pass from
neutral or non-registering positions relatively to
the several incandescent lamps to the correspond
the arcuate opening 16 in the disc 66.
ing photoelectric cells.
When the mentioned non-registering relation
ship is reached the photoelectric cell which had
Operation of means initiating adjustment 0')? the
previously been activated to start the motor 41
compensator pump
becomes deactivated, and the other photoelectric
It will be seen that, with this arrangement, a
cell remains deactivated so that the adjustment
slight non-uniformity in the advance movement 10 thus established in the operation of the pump 35
.of the press slide will rotate the cage 64 and
remains effective and the three pumps 22a, 22b
' the disc 55 carried thereby to some extent, thus
and 35 function together to deliver uniform
causing the areuate opening 16 to at least partly
quantities of liquid to the ram chambers 28a and
register with the radial slots in one or the other
29b in order to accomplish the advance stroke of
of the mentioned cell assemblies to permit the 15 the press slide without permitting more than a
passage of light to and cause the activation of
permissible departure of said slide from abso
one or the other of the cells d8, 49, depending
lute parallelism.
upon the direction of cooking of the press slide.
In order to simplify Figure 5, the compart
The activation of one or the other of said cells
ments l2, 15, housing the cells 158, 49, are not
completes a circuit through the related ampli?er
shown therein. The said ?gure, however, ade
5B or 5| and related relay coil 58a and 51a in
quately indicates the relative positions of the es
sential parts of the several cell assemblies and
Fig. 5, that the connections between the plus
of the shutter arrangement whereby to render
and minus leads, comprising the source of current
the operation of the mechanism understandable.
supply, and the shunt winding 41a and rotor of 25 The lamps 48:1: and 490:, of course, are connect
a well understood manner. It may be seen from
the motor 41 are established through the con
taotors of the relay coils 50a or 5la and are so
ed (in a manner not shown) to suitable sources
of electric energy.
arranged that when coil 50a is energized through
gc'omzilete operation of press and the slide
the activation of cell 48, the current passes
movement control means
through the winding 41a in one direction and 30
when coil 5 la is energized through the activation
Although the operation of portions of the dis
of cell 49, the current passes through said wind
closed apparatus may be understood from the
ing in the opposite direction, the current flow
foregoing description, it should be helpful to re
through the rotor being unidirectional. Thus,
view the operation of the press and its control
the motor 41 may be controlled to operate in the 35 ling means in its entirety. Referring particu
proper direction to initiate movement of the pump
larly to Fig. 5, it may be assumed that the press
control member 31 to cause the pump 35 to pump _
is open and that the pistons 24a, 241), the cen
liquid from the liquid supply of the ram chamber
tering device 2'1, and the related solenoids 28a,
at the faster moving side of the press slide to the
28b, are in central or neutral positions, and that
liquid supply of the ram chamber at the slower 40 all other parts are in the positions indicated in
moving side of the slide, to substantially equalize
said figure, the motor 4? being inactive and the
the volumes of liquid being pumped into the
pump 35, although being continuously driven by
two said chambers in order to prevent further
its motor 35a, being in neutral adjustment under
increment in non-parallelism despite non-uni
which no liquid is passing through said pump
formity in distribution of the forces resisting
between the pipes 32a and 322). It may be as
the advance of the slide. The connections of the
sumed, also, that the die or dies in the press are
cells 48 and 49 in the circuits controlling the
of such irregularity as to present a greater resist
motor 41' are, of course, so arranged that the op
eration of the said motor will be in the proper di
ance to the advance of ram 181) than ram lBa so
that when a blank in the press is engaged be?
rection to initiate such equalization.?
50 tween dies or pressing members carried upon the
bed ll of the press and upon the press slide it,
Limitation of adjustment of the compensator
the left side of the slide it will tend to move
downwardly in advance of the right side thereof.
The press operator, to start a cycle of operation,
A second control, which terminates the opera
tion of the motor 41, comprises a rack 11 which ' may close an electric circuit through solenoid
28a, causing the latter, upon thus being energized,
is preferably connected through a link ?i8 and a
to shift the valve pistons 24a, 24b, in unison, to
turnbuckle connection 19 to the arm of the bell
the left to the positions shown in Fig. 5, thus per
crank 39 which actuates the pump control mem
mitting liquid from the tank 29 to be pumped by
ber 31. The said rack is preferably guided by a
the pumps 22a, 2227, through the valves 23a, 23b,
guide member \80 which may be fixed upon the
into ram advance chambers 20a, 28b, to move the
crown l3 of the press. The toothed portion of
rams [8a, Nib, downwardly; the liquid in return
said rack is arranged to engage a toothed seg
ment 8| integrally formed with or ?xed upon the ' chambers 240;, Hi), meanwhile, being exhausted
.
pump
periphery of the drum 68.
7
,
through pipes 33a, 33b, and through valves 23a,
23b and pipes 34a, 3419, into the tank 29.
This second control functions to terminate the
When the slide l6 reaches a point in its down
operation of the motor 41 by reason of the fact
ward movement at which it is opposed by the en
that, as the operation of said motor modi?es the
gagement of the blank between the dies or press
adjustment of the compensator pump 35 it also
ing members, the greater resistance offered to the
actuates the rack 11 which turns the drum 68 in
the same direction as the disc 66 had previously 70 further advance of the right side of the slide
causes liquid slippage in the pump 2217, or other
turned to start said motor. Thus, as the adjust
conditions under which the ram chamber 20b
ment of the pump 35 brings the compensating
receives a somewhat smaller volume of liquid than
action of the pump up to the point at which the
is received by ram chamber 20a, so that the left
discharge of liquid to the two ram advance cham
side of the press slide moves downwardly in ad
hers is substantially equalized, the rotation of
2,405,640
9
10
Vance of the right side thereof; and, unless? the
during: the advance stroke of the press slide, the
said pump substantially equalizes the volume of
liquid e?ectively being delivered to the two ram
mentioned. inequality of liquid delivery is rem
edied, the cocking of the slide?becomes progres
sively greater and highly objectionable and pos
advance chambers.
',
sibly dangerous.
According to the present invention, however, at
The mentioned stopping of the motor 41 occurs
by reason of the fact that, as the bell-crank 39
the very inception of such cocking of the press
turns, to move the control member 3"! outwardly,
it also operates the rack ?ll which turns the eas
slide, the rotation of the shaft 52, driven by rack
ing 68 in the same direction (?clockwisely, as
56 in the direction indicated by the arrow 52a,
becomes more pronounced or of a greater degree 10 viewed in Fig. 4) as the disc 66 previously turned
in response to the departure of the press slide
than the opposite rotation (arrow 53a) of the
from parallelism; thus moving slots ?H a and 12a
shaft 53, which is driven by the rack 57. In the
into non-registering positions relatively to the
manner already explained, this difference of? ro~
arcuate opening 16, whereupon the cell 49 be
tation of the two said shafts immediately causes
the differential cage 6t, and the disc 6%; carried 15 comes deactivated, opening the circuit through
motor? 4'! and thereby stopping the latter.
thereby, to turn somewhat, in a clockwise direc-?
Assuming proper design of the various com
tion as viewed in Fig. 4. As the relationship of
the slot l2a to the arcuate opening 16 preferably
ponents of the described apparatus, the motor
?ll, after initiating adjustment of said pump,
is such that even a slight clockwise turning of the
will stop at the time the said adjustment be
disc 65 will bring said slot and Opening into at
least partial register, it will be seen that as soon
comes eifectiveto cause said pump to yield sub
stantial equalization of the volumes of liquid be
as cocking of the press slide commences, the turn
ing of the disc 66 permits light rays to pass from
ing? delivered to the two ram advance chambers.
Inasmuch as the motor 111 starts immediately
lamp 49m, through slot ?Ha, arcuate opening ?it,
and slot l2a to the cell 49. Thus the latter is 25 upon even a slight departure of the press slide
from parallelism, the pump 35 immediately com
activated, thereby closing an electric circuit
through related ampli?er 5| and relay coil tila
mences to bring the volumes of'liquid effectively
delivered to the two ram chambers nearer to
to close contactors 55b, 5 i0 and establish a circuit
through rwinding 47a and the rotor of motor ti,
causing the latter to start operation, practically
upon inception of non-parallelism of the press
slide.
?
'
uniformity; After such uniformity is reached,
the one of the cells 48, 139, which had previously
been activated, ?becomes deactivated and both
? cells then remain deactivated; also the adjust
ment of the pump 35 remains in condition to
The motor щl, upon closing of the mentioned
maintain proper compensation unless further and
circuit through winding Md, operates in the di
rection which causes the worm-wheel 45 and the 35 different distribution of the vresistance of the
press slide occurs during theremainder of the
presumably ?right? threaded screw G2 to turn in
advance stroke of the press slide.
a clockwise direction, as viewed inFig. 1, thereby
causing the nut M to move along said screw to
If such further change in the distribution of
ward the right and consequently causing the bell
the resistance occurs, the resulting non-paral
crank 39' to move the pump control member 31 40 lelism again turns the disc 66 to activate which
outwardly; and the mechanism of the pump 35╗ ' ever of, cells 48, 49 will set in motion the de
scribed means to again substantially equalize the
and the hydraulic connections thereof are ?such
that the mentioned shifting of the control mem
volumes of liquid being delivered to the two ram
ber 31 causes the said pump, to transfer liquid
advance chambers.
from the pipe 32a to the pipe 321?.
_
In well designed apparatus, the automatic ad
justment of the pump 35 is completed before the
The purpose of this transfer of liquid is to com
slidedeparts beyond permissible limits of non
pensate for the di?erences of liquid volumes which
parallelism and the subsequent uniformity of rate
the pumps 22a, 22b, deliver to the chambers 20a,
of effective delivery of liquid to the two ram
2%, as a result of the uneven distribution of re
sistance to the advance of the press slide. If op
posite cocking of the slide occurs, compensation,
opposite to that just described, is similarly ini
tiated by the cell 68 and related ampli?er 5i] and
relay coil Sta and contactors 501), 560., which pass
current through the winding 41a in the direction
opposite to that just described to yield opposite
operation of the motor ill and opposite operation
of they compensator pump 35. The cell 43 is acti
vated by light which may pass thereto from lamp
50 chambers causes the slide to continue its advance
movement with little or no rocking motion while
at all times remaining within permissible limits
of non-parallelism.
Upon completion of the advance stroke of the
press slide, the solenoid 28a is deenergized and
the solenoid 28b is energized by any suitable man
ual or automatic electric circuit control arrange
ment, thereby? shifting the pistons of valves
23a, 28b to their extreme ?right? positions, as a
482:, through slot ?iii-a, arcuate opening ?it, and 60 result of which liquid is pumped through said
slot 15a.
Obviously, if the operation of the motor 4'! were
not discontinued at the proper time, the men
tioned adjustment of the pump 35 would become
too great, thus causing over-compensation which
valves to the ram return chambers 2la, 2| b to
yield the return stroke of the press slide, the liq
uid in chambers 20a, 26b, meanwhile, being ex
hausted through said valves and pipes 34a, 34b,
to the tank 29.
would result in the slide cooking in the opposite
The lamps, 48:0, 4-9.1), preferably, are so con
direction, whereupon similar but oppositely-act
nected, in electric circuits (not shown), that they
remain lighted at all times during the operation
ing controls of the cells 48 and A9, functioning
alternately, would cause the slide to advance with
of the press. In the absence of some substan
a rocking motion which the present invention 70 tial non-uniform resistance the latter may main
seeks to avoid.
According to the present invention, however,
the operation of the motor ill may be discontin
ued at the proper time to leave the adjustment
of the compensator pump 35 such that, thereafter,
tain its slight permissible non-parallelism during
the, return stroke of the press slide because of
the equality in the volumes of liquid being pumped
into chambers 21a, Zlb and because of the fact
that the liquid passing through pump 35 courses
2,405,640
1l
12
freely from the tank 29, ?through the valves 23a,
should be understood that the stated description
of operation is given primarily to aid in giving
23b, and back to said tank.
.
?
If it is desired to stop the press when the re
turn stroke is completed, the solenoid 28b is de
energized and the centering device 21 moves the
pistons of valves 23a, 23b to their mid-positions?
to cut oil the discharge of the pumps 22a, 22!),
from any hydraulic connection with the several
a full understanding of the invention and that the
present invention is not limited to apparatus
which necessarily operates in the precise manner
described.
'
ram advance and return chambers in the manner
One advantage of the invention resides in the
use of electric controls wherein positive electric
connections rather than brush connections may
already explained. Immediately thereafter, the
be employed inasmuch as the limited range of
transfer of liquid by the pump 35 from the left
to the right siderof the press operates to lower
the ram l8?) relatively to ram I8a thus restoring
the parallelism of the slide.
rotation of the casing 68 makes it possible to
utilize ?exible connections to the several incan
descent lamps and cells or to the several men
tioned limit switches. Another advantage is
While this restoration is taking place there oc-v 15 found in the fact that there is no appreciable
curs a reverse or counterclockwise rotation of the
load imposed upon the racks 56, 51 and the sev
disc 66, activating cell 48 to cause reverse oper
eral related gear trains, so that no material lost
ation of the motor 41 which, as a result, shifts
motion or backlash is encountered which would
the pump control member 37 toward non-pump
delay the action of the disc 66. The latter, in
ing adjustment. Meanwhile, the casing 68, again 20 consequence, yields immediate control over the
actuated through the medium of the rack Tl, ro
several photoelectric cells or limit switches and a
tatescounterclockwisely in a follow-up motion
resulting immediate initiation of the operation of
relatively to the disc 66 which brings the two into
the pump compensating means. Another of
neutral relative positions, causing the motor 4'!
many advantages derivable from well designed
to stop and leaving the press slide in substantial
apparatus according to the invention is the sub
parallelism, in readiness for a following similar
stantial elimination of any rocking motion during
cycle of operation.
7
the pressing portion of the advance stroke of the
If the press is so controlled as to start a further
press, although the invention is of such breadth
advance stroke, automatically, upon the termina
as to include structures in which, for one reason
tion of the return stroke, the mentioned restora 30, or another, such rocking may occur.
tion of the parallelism of the slide would ordi
In? any event it is clear that the concept dis
narily occur in the manner just described, during
closed herein may be practiced in numerous forms
the initial or non-pressing part of the succeeding
without departing from the invention as de?ned
advance stroke. If under either- the mentioned
in the accompanying claims.
non-automatic or the automatic type of press op
What I claim is:
eration, the said restoration to parallelism is not
1. Apparatus for controlling the slide move
effected before the pressing part of the advance
ment in a long-bed hydraulic press having slide
stroke begins, the unequal resistance to the ad
actuating rams and related ram advance cham
vance movement, in any event, sets in motion the
compensating mechanism in the manner already 40 bers disposed toward opposite sides of the press
slide and means for pumping liquid to said cham
described.
bers, the said apparatus comprising adjustable
As the cells 48 and 49 become activated in re
compensating means for effecting compensating
sponse to the rotation of the disc 66 in opposite
variations
in the volumes of liquid pumped into
directions and as the said cells yield opposite op
eration of the motor 4'! and the casing. 68, it is -" said chambers, actuating means for varying the
adjustment of said compensating means, and
obvious that the described apparatus will yield
control
means having two coacting, separately
compensation opposite to that herein described,
movable portions for controlling said actuating
where required by operating conditions.
means; one of said movable portions being adapt
The second embodiment
The illustrated second embodiment, shown in
Fig. 6, diifers from the ?rst embodiment only in
that the disc 66a, instead of having the arcuate
ed to move in response to variations in the atti
tude of the press slide to initiate operation of
said actuating means, and the other of said mov
able portions being adapted to move in response
to variations in the adjustment of said compen
opening 15, has a raised arcuate cam surface 82
which may be of the same shape as said opening, 5.? sating means to limit the operation of said actu
ating means.
and that, instead of the two photoelectric cell
assemblies, there are provided two limit switches
83, 84, which may be directly connected, respec
tively, in the circuits of the relays 50a, 51a, con
trolling the motor 41. Those familiar with the (ill
art will understand that this embodiment will
function similarly to the described ?rst embodil
2. Apparatus for controlling the slide move
ment in a long-bed hydraulic press having slide
actuating rams and related ram advance cham
bers disposed toward opposite sides of the press
slide and means for pumping liquid to said cham
bers, the said apparatus comprising adjustable
compensating pumping means for e?ecting com
pensating variations. in the volumes of liquid
The foregoing description sets forth preferred
embodiments of this invention and a preferred cs pumped into said chambers, a reversible motor
for varying the adjustment of said compensating
mode of operation of the apparatus constituting
means, and control means having two interacting,
the invention. While the design of the compo
separately movable members for controlling said
nent parts of the apparatus should preferably
motor, one of said members being adapted to
yield the described mode of operation, neverthe
less, it should be apparent that diii?erences in p. move inresponse to variations in the attitude of
the press slide whereby to start said motor to in
design of parts or differences?in conditions, as
where complex and varying non-uniform resist
itiate a variation in the adjustment of said com
ances to the slide advance are e'ncountered, may
pensating means, and the other of said members
cause the invention to yield a somewhat different
being adapted to move in response to variations
ment.
compensating operation
than described. It
, in the adjustment of said compensating means
2,405,640
13
whereby to stop said motor to terminate the var-v
iation in such adjustment.
3. Apparatus for controlling the slide move
ment in a long-bed hydraulic press having slide
actuating rams and related ram advance cham
14
sating means, a make and break device for con
trolling operation of said motor in opposite direc
tions, and control means for said motor compris
ing a ?rst member, movable in response to varia
tions in the attitude of the press ?slide, and a sec
bers disposed toward opposite sides of the press
slide and means for pumping liquid to said cham
ond member, movable in response to variations in
the adjustment of said compensating means; the
bers, the said apparatus comprising adjustable
two said members being adapted, upon relative
compensating pumping means for effecting com
movement thereof, to operate said make and
pensating variations in the volumes of liquid 10 break device whereby to modify the control ex
pumped into said chambers, ?a reversible electric
erted by said control means upon the electric
motor for varying the adjustment of said com
motor; the movement of said ?rst member being
pensating means, and control means having two
interacting, separately movable members for
controlling oppositely acting electric circuits
through said motor, a ?rst one of said members
in one or the other of opposite directions depend
ing upon the direction of variation in the attitude
of the press slide and being adapted to initiate
a compensation-yielding variation in the adjust
ment of said compensating means; and the move
ment of said second member being subsequent to
being adapted to move, in response to variations
in the attitude of the press slide, in either of op
posite directions depending upon the direction
and in the same direction as that of said ?rst
of such a variation, whereby to start said 20 member and being adapted to terminate the
motor to initiate a compensation-yielding varia
variation of such adjustment.
tion in the adjustment of said compensating
8. Apparatus according to claim '7, further
means, and the other of said members being
characterized in that the said make and break
adaptedto move, subsequently to and in the same
device comprises two photoelectric cells for con
direction as the movement of the ?rst one of
trolling operation of said motor in opposite di
said members, in response to said adjustment
rections, and one of the said movable members
variation, whereby to stop said motor to ?termi
has a shutter opening therein arranged to move,
nate the variation in such adjustment.
upon relative movement of said two members,
4. Apparatus for controlling the slide move
between a non-registering ?position, preventing
ment in a long-bed hydraulic press having slide so passage of light to either of said cells, and either
actuating rams and related ram advance cham
of two different registering positions, permitting
bers disposed toward opposite sides of the press
passage of light to one or the other of said cells.
slide and means for pumping liquid to said cham
9. Apparatus according to claim 7, ,further
bers, the said apparatus comprising adjustable
characterized in that the said make and break
compensating pumping means for effecting com 35 device is mounted upon and moves with one of
pensating variations in the volumes of liquid
the mentioned movable members.
pumped into said chambers, a reversible electric
10. Apparatus according to claim '7, further
motor for varying the adjustment of said com
characterized ?in that the said control means
pensating means, and control means comprising
comprise a diiferential assembly coacting with
two electric circuits, adapted to control opera 40 and deriving its operation from the movement of
tion of said motor in opposite directions, a make
opposite sides of the press slide, that the said
and break device in each of said circuits, means,
?rst movable member is adapted to be rotated
responsive to variations in the attitude of. the
press slide, for starting said motor, through es
tablishment of a circuit in One of said devices,
to initiate a compensation-yielding variation in
the adjustment of said compensating means, and
means, responsive to the variation in such ad
justment, for stopping said motor through break
by said differential assembly, that the said sec
ond movable member is adapted to be rotated by
said electric motor.
- 11. Apparatus according to claim 7, further
characterized in that the said control means
comprise a differential assembly coasting with
and deriving its operation from the movement
ing of said circuit in said device, to terminate the to of opposite sides of the press slide, a rack, co
variation in such adjustment.
acting with and driven by said motor, that the
5. Apparatus according to claim 4, further
said ?rst movable member is adapted to be ro
characterized in that the said make and break
tated by said differential assembly and the said
devices each comprises a photoelectric cell hav
second movable member is adapted to be ro
ing circuit-controlling characteristics which are
tated by said rack.
'
Variable in response to variations in the attitude
12. Apparatus according to claim '7, further
of the press slide and in the adjustment of the
characterized in that the said make and break
said compensating means.
device comprises an electric switch, and one of
6. Apparatus according to claim 4, further
the said movable members has a cam surface
characterized in that the said make and break CO thereon, arranged to operate said switch upon
devices each comprises an electric switch adapt
movement of said ?rst member and to discon
ed to shift between its open and closed positions
tinue the operation of the switch upon subsequent
in response to variations in the attitude of the
movement of the said second member.
' press slide and in the adjustment of the said com
13. Apparatus for controlling the slide move
pensating means.
,
ment in a long-bed hydraulic press having slide
7. Apparatus for controlling the slide move
actuating rams and related ram advance cham
ment in a long-?bed hydraulic press having slide
bers disposed toward opposite sides of the press
actuating rams and related ram advance cham
slide and means for pumping liquid to said cham
bers disposed toward opposite sides of the press
bers, the said apparatus comprising adjustable
slide? and means vfor pumping liquid to said cham 70 compensating means for effecting compensating
bers, the said apparatus comprising adjustable
compensating means for eifecting compensating
variations in the volumes of liquid pumped into
said chambers, a reversible electric motor for op
positely varying the adjustment of said compen
, variations in- the volumes of liduid pumped into
said chambers, means responsive to variations
in the attitude of the press slide, for initiating
variations in the adjustment of said compensat
75 ing means, and means, responsive to such varia
2,405,640
15
16?
tions in adjustment, for terminating variations
and a second member adapted to coact with said
first member upon such movement to controlan
in such adjustment.
'
14. Apparatus for controlling the slide move
ment in a long-bed hydraulic press having slide
actuating rams and related ram advance cham
bers disposed toward opposite sides of the press
slide? and means for pumping liquid to said
chambers, the said apparatus comprising adjust
able compensating means for effecting compen
electric circuit, a motor controlled by said circuit
and adapted when operated to start operation of
said reciprocable adjustment member and to ac
tuate said second member in a follow-up move
ment relatively to said ?rst member whereby to
restore the relative positions of said two mem
bers and limit the operation of the motor and of
'
'
sating variations in the volumes of liquid pumped 10 the adjustment member.
18. Apparatus for controlling the adjustment
into said chambers, and control means compris
in the rate of ?ow of a ?uid pump having a mov
ing a ?rst control member, movable in response
able ?ow-rate adjusting member, the said ap
to variations in the attitude of the press slide,
paratus comprising a motor for moving said ad
for initiating a variation in the adjustment of
justing member, a speed-reducing connection be
said compensating means, and a second control
tween the motor and the ?ow-rate adjusting mem
member, adapted, in direct response to such vari
ations in adjustment, to pursue? a? follow-up
ber adapted to limit the latter member to rela
tively slow movement, two coacting control mem
?movement relatively, to the movement of said
bers for controlling said motor, means respon-i
?rst control member, for terminating the vari
ation in the adjustment of said compensating 20 sive to movement of said control members rela
tively to each other for starting and stopping said
means.
15. Apparatus for controlling the slide move
motor, a movement of a ?rst one of said con
ment in a long-bed hydraulic press having slide
trol members from an initial relationship rela
tively to the second control member causing said
actuating rams and related ram advance cham
bers disposed toward opposite sides of the press 25 motor to start, and the second of said members
having a continuously operable connection to
slide and means for pumping liquid to said cham
said adjusting member and being adapted, when
bers, the said apparatus comprising adjustable
the motor is operated, to derive a follow-up mo
compensating means for e?ecting compensating
variations in the volumes of liquid pumped into
tion from the adjusting member, in the same di
said chambers, actuating means for varying the 30 rection as the mentioned movement of said ?rst
adjustment of said compensating means, and
control member, whereby to bring the twocon
control means comprising two photoelectric cells
trol members into their mentioned initial rela
tionship, to stop the motor.?
adapted to control the operation of said actuat
19. Apparatus for controlling the rate of de
ing means in opposite directions, the changes in
the operating characteristics of the cells, to ef 35 livery of ?uid to a chamber of a ?uid-actuated
fect such control, being derived from variations
motor; comprising a pump adapted to'pump ?uid
in the attitude of the press slide and from subse
to the chamber. adjustable ?ow-varying means
quent variations in the adjustment of said com
adapted to vary the rate of delivery of ?uid from
pensating means.
said pump to said chamber, actuating means
16. Apparatus for controlling the slide move 40 adapted to actuate said flow-varying means, and
control means for controlling the operation 'of
ment in a long-bed hydraulic press having slide
said actuating means; the said control means
actuating rams and related ram advanced cham
comprising two coacting members adapted to
bers disposed toward opposite sides of the press
control the operation of said actuating means
slide and means for pumping liquid to said cham
whereby to effect adjustment of the ?ow-varying
bers, the said apparatus comprising adjustable
compensating means for effecting compensating
means to increase or decrease the ?ow of ?uid
variations in the volumes of liquid pumped into
to said chamber, the said two members being
initially movable relatively to each other from
said chambers, actuating means for varying the
an initial relationship in response to movement
adjustment of said compensating means, and
control means comprising two electric switches
of a driven member of said motor, different than
adapted to control the operation of said actuat
a predetermined movement thereof, to initiate
operation of said actuating means to correct such
ing means in opposite directions, the shifting of
said switches between open and closed positions,
movement, and subsequently movable relatively
to effect such control being derived from vari
toveach other, back to said initial relationship,
ations in the attitude of the press slide and from
in direct response to the mentioned operation of
subsequent variations in the adjustment of said
said actuating means, whereby to'terminate cor;
compensating means.
.
.
rection of such movement.
17. Apparatus for controlling the slide move
20. Apparatus for controlling the adjustment
ment in a long-bed hydraulic press having slide
in the rate of ?ow of a ?uid pump having a mov
actuating rams and related ram advance cham
able ?ow-rate adjusting member, the said ap
bers disposed toward opposite sides of the press
paratus comprising a motor, two coacting control
, slide and means for pumping primary supplies of
members for controlling said motor, means ?re
liquid to said chambers, the said apparatus com
sponsive to movement of said control members
prising a compensator pump? for effecting com
relatively to each other, for starting and stopping?
pensating variations in the said volumes of pri
said motor, a movement of a ?rst one of said
mary liquid supplies, a reciprocable adjustment
control members from an initial relationship rel
member of said compensator pump, adapted to
atively to the second control member causing said
effect variations in the ?ow of liquid there
motor to start, and the second of said members:
through, a pair of racks disposed at opposite sides
having a continuously operable connection to
of the press, a pair of shafts coacting with and
said adjusting member and being adapted, when
turned to similar degrees by said racks in con
the motor is operated, to derive a follow-up mo
sequence of uniform advance movement of the
tion from the adjusting member, in the same?
press slide, a mechanism having a ?rst member
direction as the mentioned movement of said
adapted to move in response to any difference in
?rst control member, whereby to bringlthe two
the degrees of rotation of the said pair of shafts
control members into their mentioned initial re
2,405,640
17
18
-
lationship, to stop the motor, the said apparatus
being further characterized in that the said ad
justing member is reciprocable and adapted to
predetermined relationship in movements of two
means.
eration or deceleration of either of the two ele
ments to restore the latters? predetermined rela
elements, comprising separate driving motors
for driving each element, a compensating motor
reversibly vary the flow of ?uid through the
adapted to modify the relative movements of said
pump; in that the said motor is reversible; and?
elements to compensate for departure from said
in that the said two control members are mov
predetermined relationship, a movable control
able in opposite directions whereby to control
device adapted to control the operation of the
the starting and stopping of the motor in the re
compensating motor, an adjustment motor adapt
verse operations thereof,
ed to operate said control device, and compen
21. Apparatus for substantially maintaining a 10 sation control means for controlling the opera
predetermined relationship in movements of two
tion of said adjustment motor; the said compen
elements, comprising separate driving means for
sation control means comprising two coacting
each element, compensating means adapted to
members, a ?rst of the latter members being mov
modify the movements of said elements, a mov
able from an initial relationship relatively to the
able adjustment member for said compensating
other member, in response to departure of the
means for adjusting the modifying e?ect of the
two elements from their predetermined relation
latter upon the movements of the two elements,
ship of movement, to start the adjustment motor
actuating means for actuating said adjustment
and thereby adjust the compensating motor to re
member, and control means for controlling the
store the said predetermined relationship, and a
operation of said actuating means; the said con
second of said two coasting members having a
trol means comprising two coacting members in
continuously operable connection to said adjust
itially movable relatively to each other from an
ment motor adapting it to pursue a follow-up
initial relationship, in response to departure of
motion in the same direction as the mentioned
the two elements from their predetermined re
movement of the ?rst member, whereby to bring
lationship of movement, to initiate operation of i the two said members into their mentioned initial
said actuating means of a character adapted to
relationship, to stop the adjustment motor.
restore the said predetermined relationship, and
24. Apparatus according to claim 23, further
subsequently movable relatively to each other,
characterized in that the compensating motor,
back to said initial relationship, in response to
the adjustment motor and the two mentioned
the mentioned operation of said actuating means, 30 members of?the compensation control means are
to terminate such operation of the actuating
reversible in operation whereby to provide accel
22. Apparatus according to claim 21, further
characterized in that a ?rst of said coacting mem
tionship.
'
bers is operatively connected to both the driven
25. Apparatus according to claim 23, further
elements and adapted to move in response to
movements of the latter other than in the men
tioned predetermined relationship and a second
of said members has a continuously operable con
characterized in that the compensation control
means include electric apparatus, responsive to
movement of the mentioned two members from
an initial relationship to start the adjustment
motor and to movement of the two members back
nection to the mentioned actuating means adapt
ing the second member to pursue a follow-up
movement in the same direction as the ?rst
member.
_
23. Apparatus for substantially maintaining a
to initial relationship to stop the adjustment
motor.
?
EARL CANNON.
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