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Патент USA US2404181

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July 16,‘ 1946'
w. KLOCKE.
‘ 2,404,131
MECHANICAL DRAWING gRE'SS
Filed March 16, 1945
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'0' ATTORNEY
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Patented July 16,. 1946
2,404,181 ‘
UNITED ‘ STATES PATENT OFFICE '
2,404,181
MECHANICAL DRAWING PRESS
William Klocke, Woodhaven, N. Y.
Application March 16, 1945, Serial No. 583,096
8 Claims. (01. 113—-38)
1
2
This invention relates to mechanical drawing
presses and provides improvements therein.
Standard actions for mechanical drawing
presses through the last half century have been
the Leavitt action (U. S. Patent 451,224), the
Klocke adaptation of the Leavitt action (U. S.
Patent 955,173) used at the beginning and con
tinued throughout the great development of the
automobile industry, and, ‘in later years, the
Klocke-Dobson action (U. S. Patent 1,411,036).
The Klocke-Dobson type of action has met with
increasing favor in recent years, because of the
the down-stroke of the punch slide and continu
ing until slightly after the punch slide reverses
movement at the end of the working stroke.
One embodiment of the invention is illustrated
economy of its construction and because, it-was
found that in drawing certain metal and alloy
nates the frame of the press comprising the bed
in the accompanying drawing, wherein:
Fig. 1 is a View in side elevation of said em
bodiment; Fig. 2 is a view in front elevation;
Fig. 3 is a detail view of the blank-holder slide,
partly in side elevation and partly in vertical sec
tion; Fig. 4 is a diagram of the timing of the
punch and blank-holder slides.
Referring to said drawing, numeral I0 desig
sheets diflicult to draw, notably stainless steel 15
||, crown l2, and side frames l4, l5.
Numeral l8 designates the punch-slide which
sheets, better results were obtained with a blank- .
is connected to a crank 2| on a crank-shaft“
holder held down on the sheet by operating ele
ments under tension than when the blank-holder
was held down on the sheet by operating elements
(or equivalent) through an adjustable connect
ing rod 22. Crank-shaft 20 may be driven in a
suitable manner,‘ as through a gear wheel 24,
under compression.
.
20 pinnon 25, shaft 26 and ?y wheel pulley 28, all
The press according to the present invention
mounted at the top part of the frame If].
Numeral 30 designates the blank-holder slide,
mounted to reciprocate in gibs 32, 33 on the side
frames l4, l5. The blank-holder slide is provided
has the favorable feature of a blank-holder which
is held down on the sheet by operating element's
under tension.
.
The present invention provides a press in which v2.5 with a central opening 35 in which the punch
the parts of the blank-holder slide operating '
slide 18 works, and through which a punch car
mechanism (including links for holding down the
ried thereon (not shown) projects. Interior
blank-holder slide under tension) are located
guides 31 may be provided on the blank-holder
above the bed of the press and within the lateral
slide 30 for the punch slide l8. The blank-holder
dimensions of the side frames, the arrangement _; 30
A slide 30 is usually, and preferably, attached to a
being such that there is no impediment to ejecting
drawn shells downwardly through the bed, ‘and
cradle 40 by means of adjustable connections 4|,
42, 43 and another similar one behind the ad
also such that a free working-table or bed and a
justable connections 43, not shown. The adjust
safe working zone for the press-operator are
able connections are used in a well known way
provided.
-
53:5 to adjust the position of a blank holder and the
The invention further provides a press con
blank-holder slide with relation ‘to a die on the
struction which minimizes the number of working
parts, in which the working parts are readily ac
cessible so that damaged parts are readily re
moved and replaced, and which is economical to
build.
The invention further provides a superior
blank-holder action of the type wherein the
blank-holder slide is actuated from a crank or
eccentric through toggles, there being less reces
sion of the blank-holder slide at the mid-part of
the dwell than with any of the ‘previously known
standard constructions referred to above. The
invention further provides a blank-holder action
by which overlapping movement of the punch and
blank-holder slides at the top of ‘the strokeis
avoided, or greatly minimized, maintaining at the
same time the desirable dwell of the blank-holder
throughout somewhat more than 90° of the punch
slide movement, beginning at about half-way of
.40
bed I l in such manner that a sheet of metal be
tween the blank holder and die will be properly
gripped at the bottom of thestroke position of the
blank-holder slide. The cradle 40 has bosses 46,
4'! which project through slots 49 in each of the
.side frames |4,_| 5 and carry studs or pins 5| , 52.
Attached to the pins 5|, 52 are links 55, 56 which
work under tension in the blank holding position
of the blank-holder slide 30.
Numerals 60, 6| designate bell cranks, one on
the outside of each, of the side frames l4, l5.
These bell cranks 60, 6| turn on pins 63, 64 seated
in the side frames. Advantageously; the bell
cranks 50, 5| are located well above the'level of
bed I I. The links 55, 56 are attached at their
lower ends to pins 66, 61 on the bell cranks 60,1 6|
respectively. The links 55, 56 and the arms of the
bell cranks to which they are attached constitute
55 the levers of toggles.
,
2,404,181
B. The crank pin 9| of the blank-holder actuat
ing mechanism may be set on shaft'Z? at the
same angle as the crank pin 2| which drives the
punch slide. The blank-holder slide reaches
‘ Above the bell cranks 60, BI is a rock shaft 1e.
running across the press and having rock arms 12,
13 at either side. The rock arms 72, 13 are con
nected to the bell cranks 60, 6| through relatively
long links ‘H, 18. The links ‘H, 18 are attached to
blank-holding position slightly ahead of the
punch contacting the sheet. Theblank-holder
pins 89,’ 8| on the rock arms 12, ‘I3 respectively
slide dwells in blank holding position throughout
and to pins 84, 85 on the bell cranks 69, El respec
about one-half of the downward movement of the
tively. The rock arms 12, 13 and the links ‘I1, 18
punch slide. The dwell of the blank-holder slide
constitute the levers of toggles.
The rock shaft 111 is oscillated by means of a 10 is continued for a few degrees after the punch
slide starts its upward movement, so that the
crank arm 8'! and pitrnan rod 89. The crank arm
punch can start to pull out from the drawn shell
81 is advantageously fastened on the crank shaft
29, the pitman rod 89 being attached to the pin . before the shell is released by the blank holder.
‘Thereafter the blank holder slide and punch slide
9| on the crank arm and to the pin 88 on they
move upwardly together, favoring the length of
the interval that both the punch slide and blank
rock arm ‘I2. The two cranks 2| and ‘H! may ‘be 7
set at the same angle on shaft 29 which is ad- ,
holder slide are lifted from the die on the bed.
By setting the crank-pin 9| on shaft 29 at, (or '
. The arrangement of the parts is such that when
approximately at, within a lead of about 15°) the
the pins 5|, 66 on which the link 55' turns and
the pin 63 on which the bell crank .60 turns are in 20 same angle as crank-pin 2|, overlapping move
vantageous to economical manufacture.
ments of the ‘blank-holder slide and punch slide
at the top of the stroke position is‘ avoided or
greatly minimized with reference to blank-holder
turn (pins 8!}, 84 and center of rock shaft 19)
actions in which the crank-pin which drives the
move through a short are over dead center posi
tion, and also the centers on which the crank 87 2 blank-holder slide is set angularly considerably in
advance of the crank-pin which drives the punch
and pitman rod 85 turn (center of shaft 29, pinv
slide. There is obtained by the present invention
9|, and pin 89) also move in a short are over dead
(with its other advantages) the same thing with
center position.
,
crank-pins set at the same, or nearly the same,
The rock shaft 1i) is advantageously mounted
' in bearings 93 on the front of the side frames l4, 30 angle as is accomplished in other constructions by
setting the crank-pin for driving the blank-holder
l5 in such a way that by removing the caps ‘of the
slide angularly in advance of the crank-pin for
bearings, the rock shaft 19 is. free to be removed.‘
driving the punch slide, to wit, a blank-holder
One of the aims of the invention being to attain
dwell beginning 'at about one-half way'of the
safety for the working man, the rock shaft 19 is
advantageously located above the head level of 35 down stroke of the punch slide and continuing to
the end of the down stroke of the punch slide,
the workman, at about the lower level of the gear
dead center position (blank holding position), the
centers on which the rock shaft 1|) and link ‘ll’
wheel 24.
a
and slightly or somewhat longer to enable the
‘
punch to start pulling away from the drawn shell
before the shell is released by the blank-holder.
In the drawing, the blank-holder slide and its
actuating parts are shown in blank-holding posi
The blank holder operating parts are at the
outer sides of the side frames. The press is there:
by readily assembled, and damaged parts are-l
readily removed and replaced by new parts. This
is of very great practical importance in shops
having limited head-room, and in all kinds of
shops in limiting the time a damaged press is out
of use.
.
a
"
tion. The pin 9| of crank .81 moves through
an are passing through dead center with rela
tion to the 'pin 80, and in this position the pit
45 man rod 89 moves the crank arms 12, 13 and links
11, 18 through arcs passing through dead center
with relation to the pins 84, and 85 and the axis
of shaft 19. The links TI, ‘l8 being relatively
a The blank holder operating parts comprise ten.‘
sionelements or links 55, 56, which, in the blank
holding position of the blank holder slide, press
the blank holder slide down under tension, which,
long, the amount of movement imparted to the
. as previously stated, has been found to give sue 50 bell cranks 69, .6! will ‘be small as compared with
perior results in the‘dhawing of certain metals,’
stainless steel sheets, for example. In all sizes of;
presses the location of the bell cranks 5|}, El and
rock shaft ‘HI, well above the bed of the press pro
vides a clear working space for feeding the press,\ 65
and-enables drawn shells to be ejected or removed
downwardly through the bed. The blank holder
operating parts being located at the ‘sides of the
frame, and at a height above the bed, are out of
the way so'as notlto be apt .to strike or injure the;
workman. In medium and large size presses
theserparts would .be well above the head level of a
the workman. Nevertheless the blank-holder ac
tuating mechanismv has advantages aside from
the location of the parts above the bed level, one
such advantage being a lessened recession ‘of the
blank-holder'mid-way' of the dwell, .as hereinafterv
more fully described.
-
Operation
‘
the movement which would be imparted by 'a
shorter link, for the reason that the arc through
which the pin .89 is movedover dead center,
for a shorter link, is deeper than the arc for a
longer link, and consequently the amount ' of
movement imparted to the bell cranks 66, v5| is
greater for the shorter link.
'
'
While the pin 9| is moving in a short are in
its dead. center position, and while the pin 8-!)
is moving in a short arc across its dead center,
the links 55 and 55 connected to the bell cranks
60 and 6| and to the cradle of the blank holder
slide are on dead centerrwith reference to the
pins 63., 64. The amount of movement imparted
to the bell cranks 56, 6| being very small, as
just described, the .amount of recessive move
ment of the blank-holder slide will be very‘small.
In presses, according to the present invention the
recession is on the order of a ‘few thousandths
70 of ‘an inch (.014"), whereas in standard presses
of the types referred to,[the amount of recession
is about 3 times as much. Actually, however,
there may not be any recessive movement of the
: blank-holder slide because of elasticity in the
The movements of the punch slide I3 and'the
blank holder slide 39 are illustrated in the dia~
gram Fig. .4, the movement of the punch slide be;
ing shown by the curve P and vthe movement of
the blank-holder slide being shown by the curve 75 links 55, 55. These links 55, 56 hold the blank
2,404,181
5
holder slide down in blank holding position,
under tension; this provides some elasticity in
the means which hold the blank holder in blank
holding position.
'
After the period of dwell of the blank-holder
slide, the crank pin 9| moves toward the op
posite side of the crank circle, and this causes
the pitman rod 89 to swing the arms 12, 13 up
6
gle turns, and the centers on which said crank
and pitman rod turn are also in substantial aline
ment, in the blank-holding position of said slide.
' 4. In a mechanical drawing press according to
claim 3, wherein said bell crank is pivoted at a
point substantially above the level of the bed of
the press.
5, In a mechanical drawing press comprising
wardly, and the links '11, 18 swing the bell cranks
a frame, a bed, a blank-holder slide and actuating
60, 6| upwardly, and the blank-holder slide is 10 means therefor, said actuating means comprising
lifted through the links 55, 56. The timing and
a bell-crank pivoted 0n the press frame at a
movements of the punch and blank-holder slides,
' point substantially above the level of the bed of
as previously stated and as will be seen from.
the diagram Fig. 4, is such that both slides move
upward in harmony and that the reversal of 15
movement thereof at the top of the stroke oc
curs virtually simultaneously.
With the parts of the blank holder operating‘
the press, a link connected to said blank-holder
slide and to said bell-crank at a point below and
substantially in line with the link connection to
the blank-holder slide and acting on said blank
holder slide under tension in the blank holding
position of said slide, a rock-shaft, mounted at the
upper part of the press-frame, having a rock
mechanism located well above the bed level, as
illustrated in the drawing, drawn shells may be 20 arm, a link connecting said rock-arm and an arm
readily pushed or ejected through the bed of the
of said bell-crank, said link and rock arm to
press. This is an advantage of much practical
gether constituting a toggle, and a crank and
importance over previous presses having rock
pitman rod for actuating said toggle, said parts
shafts below bed level.
'
being so interrelated and arranged that the cen
Drivingforce is imparted to the several levers
ter on which said bell-crank turns and the cen
and arms at good working angles, thereby avoid
ters on which the link connecting the blank
ing binding, an achievement often di?icult to
holder slide and bell-crank turns are in substan
obtain in press-construction, and this with the
tial alinement, and the centers on which the tog
harmonious movement of the punch and blank
gle turns, and the centers on which said crank
holder slides referred to above, provides a very 30 and pitman rod turn, are also in substantial aline
easy and smooth running press.
ment, in the blank-holding position of said slide.
What is claimed is:
6. A mechanical drawing press, according to
1. In a mechanical press, a frame, a blank
h'older slide and actuating means therefor, said
claim 5, further comprising a main crank-shaft
at the top of the press frame, and wherein said
actuating means comprising a bell-crank, a link 35 crank which is connected to said pitman rod is a
connecting one arm of said bell-crank and said
part of said main crank-shaft.
'
slide, a toggle comprising a link connected to the
7. A mechanical press according to claim 43,
other arm of said bell-crank anda rock arm piv
further comprising a crank-shaft and a punch
otally connected to the frame of the press at a
slide driven thereby, and wherein said crank arm
level above said bell-crank and above the work 40 forming part of the blank-holder actuating mech
ing space between the bed of the press and the
anism is set at substantially the same angle as
blank-holder slide, and a crank and pitman rod
the crank on said crank-shaft which drives the
for moving the levers of said toggle to and from
punch slide, and wherein said blank-holder
alinement.
,
reaches blank-holding position about mid-way
2. A mechanical press according to claim 1, 45 of the down-stroke of said punch slide, dwells
further comprising a crank-shaft for driving a
until slightly after said punch slide begins its up
punch slide, and wherein said crank for actuating
ward stroke, and thereafter moves upwardly
said blank-holder slide is set at substantially the
simultaneously with said punch slide.
same angle as the crank on said crank-shaft.
8. In a mechanical drawing press, a frame, a
3. In a mechanical drawing press comprising a 50 blank-holder slide and actuating means therefor,
frame, a bed, a blank-holder slide and actuating
means therefor, said actuating means comprising
a bell-crank pivoted on the press frame, a link
said actuating means comprising a bell-crank,
a link connecting one arm of said bell-crank and
said slide, a toggle comprising a link connected
connected to said blank-holder slide and to said
to the other arm of said bell-crank and a rock
bell-crank at a point below and substantially in 55 arm, a crank-shaft and pitman rod for moving
line with the link connection to the blank-holder
the levers of said toggle to and from alinement,
slide and acting on said blank-holder slide under
a rock shaft having said rock arm thereon, run
tension in the blank-holding position of said slide;
ning from one side to the other of the frame at
a toggle connected at one end to said bell crank
a level above said bell-crank and above the work
and at its other end to the press frame at a point
ing space between the bed of the press and the
above its connection to said bell crank, and a 60 blank-holder slide, acting to transmit blank-hold
crank and pitman rod for actuating said toggle,
er actuating force from one side of the press to
said parts being so interrelated and arranged
the other, and duplicates of said bell-crank, link,
that the center on which said bell crank turns and
and toggle-constituting parts at the side of the
the center on which the link connecting the blank 65 press opposite said pitman rod.
holder slide and bell crank turns, are in substan
tial alinement, and the centers on which the tog
WILLIAM KLOCKE.
Disclaimer
2,404,181.—William Klocke, Woodhaven, N. Y. MECHANICAL DRAWING PRESS.
Patent dated July 16, 1946. Disclaimer ?led Feb. 17, 1948,‘by the inventor.
Hereby enters this disclaimer from claim 1, of any arrangement of the link con
nected to the slide which does not extend upwardly from the bell-crank.
[O?ic'ial Gazette March 23, 1948.]
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