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Патент USA US3053132

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Sept‘ll, 1962
F. MARTINDELL
3,053,122
WORK PIECE EJECTOR FOR COINING PRESSES
Original Filed May 2, 1957
6 Sheets-Sheet 1
32
33
FRANK MARTINDELL
Sept. 11, 1962
F. MARTINDELL
3,053,122
WORK-PIECE EJECTOR FOR comma PRESSES
Original Filed May 2, 1957
6 Sheets-Sheet 2
29
32
36
INVENTOR
FRANK MARTINDELL
ATTORNEY
Sept. 11, 1962
3,053,122
F. MARTINDELL
WORK-PIECE EJECTOR FOR COINING PRESSES
Original Filed May 2, 1957
6 Sheets-Sheet 3
MmmR
>
65
FRANK MARTINDELL
/ 0.»)
ATTORNEY
:
Sept. 11, 1962
3,053,122
F. MARTlNDELL
WORK PIECE EJECTOR FOR comma PRESSES
Original Filed May 2, 1957
6 Sheets-Sheet 4
INVENTOR
FRANK MARTINDELL
3
,4 @
53
4.o
T,.I.
ATTORNEY
Sept. 11, 1962
F. MARTINDELL
3,053,122
' WORK-PIECE EJECTOR FOR comma PRES-SE8
Original Filed May 2, 1957
6 Sheets-Sheet 5
370
38
37
l'l/
59
47“
42b
91
52
IO
45b
/
INVENTOR
FRANK MARTINDELL
L /
62
Sept- 11, 1962
F. MARTINDELL
3,053,122
WORK-PIECE EJECTOR FOR comma PRESSES
Original Filed May 2, 1957
6 Sheets-Sheet 6
40
63
INVENTOR
FRANK MARTINDELL
BY
ATTORNEY
,
aesarzz
Patented Sept. 11, 1962
2
actuated from the ram of the press; and wherein the
3 053 122
WORK-PHECE EJECTGR FOR COEWG PRE§SES
Frank Martindell, Bridgeton, Nail, assignor to Ferracute
Machine Company, Bridgeton, N.J., a corporation of
New Jersey
Original application May 2, 1957, Serial No. 656,603,
ejector consists of a reciprocably mounted guide carriage
carrying a knock-out pad and a toggle linkage suspend
ing said carriage in its inoperative position, when the
linkage is straight (or on dead center), the carriage being
operated in its ejection stroke toward the bed of the
press, when said toggle linkage is broken or angulated
vided and this application Mar. 17, 195%, Serial No.
from its straight position by a suitable means, thus apply
727,016.
ing a high maximum pressure force on the work-piece at
5 Claims. (or. 78—41)
10 the beginning of the ejection stroke which force is re
The present invention relates to improvements in coin
duced progressively thereafter as the angulation continues.
ing presses and more particularly to an improved work
Another object of this invention is to effect the angula
piece ejector therefore and is a division of my copending
tion of said toggle linkage by a camming member, prefer
application Ser. No. 656,603 which has matured into Unit
ably an oscillatory cam, having a dwell, mounted for ad
15 justment toward and from the knee of the toggle linkage,
ed States Patent No. 2,910,898.
In coining press-operations, and in some embossing
with which it engages, to vary the degree of angulation of
press-operations—as distinguished from punching, draw
said linkage—and hence the length of the ejection stroke
ing, cutting, blanking and/or forming press-operations
of the carriage and its knock-out pad, thus assuring a con
very great pressures are employed to cause the material
stant cut-off or end-point of ejection and facilitating any
of the work-piece, being coined (such as metal, plastic 20 required adjustment of the timing of the work-piece feed
ing means.
resins or the like), to ?ow within and between the matrix
surfaces of opposing closed dies. In late years the side
A further object and advantage of the present ejector
now Patent No. 2,910,8%, dated Nov. 3, 1959.
Di
walls of at least one die (usually the lower) are straight
means is that it may be arranged vertically so that the
and therefore are not relieved or tapered to allow easy
ejector may be withdrawn to its inoperative position by
removal of the work-piece; and, when these dies are sepa 25 gravity, under the weight of the toggle means assuming its
rated, the work-piece is tightly bound or swagged in
straight position, without the need of additional actuating
one die (usually the lower or bed die) and is most dif?
mechanism for this purpose.
cult to remove without injury to the work-piece. This
A still further object of the invention is the provision
di?ficulty has gradually increased over the years and has
of a toggle coining press having such a toggle actuated
been greatly intensi?ed since the advent of powdered
ejector, as just described, which possess a relatively sim
metallury (in the making of bushings for instance) and
especially in the more recent coining of resinous~plastic
materials. {In such instances, the old practices and devices,
previously employed, as knockouts, are inadequate. The
mere application of greater force or pressure to the ejector
pad often injures the formed work-piece and projects
ple and inexpensive construction, yet rugged to endure
the tremendous pressure under which the press operates in
the performance of its work and which may be quickly
adjusted to best meet the requirements of the particular
work to be done, thus increasing the output of the press.
To attain these objects and advantages, as well as other
objects as will appear, the invention consists of the fea
tures of novelty in substantially the construction, com
coining operations, which are almost invariably per
bination and arrangement of the several parts herein
formed on, so-called, toggle or knuckle presses, there has 40 after more fully described and claimed.
been a long felt need for an adequate work-piece ejector
In the drawings, which show, by way of example, one
for such coining presses which will eject the work-piece
embodiment of the invention as at present devised:
e?icaciously with a minimum of damage and injury there_
FIGURE 1 is an elevation of the front side of a coin
to and which may be conveniently adjusted to vary the
ing press equipped with the present invention;
it at great speed from the die.
Because of these di?iculties and the peculiarities of
length of the ejecting stroke without reducing the force
below that required to properly eject the work-piece or
disturbing the timing of the usual automatic work-piece
feeding mechanism.
I have found that by employing a toggle-joint linkage
to actuate the ejector with a pull-force in its ejecting
FIGURE 2 is an elevation of the rear side of the coin
ing press shown in FIGURE 1 and equipped with the
present invention;
FIGURE 3 is a side elevation of the coining press,
looking from the right-hand side of FIGURE 1;
FIGURE 4 is an enlarged vertical sectional view taken,
substantially on line 8-8 of FIGURE 2 and illustrat
ing certain details of the work-piece ejector with the ram
or tool-slide in its lowermost position and acting on the
work-piece in the die on the bed of the press and with
stroke, upon the breaking or angulation of this linkage
from its normal straight position, a maximum high force
is applied initially upon the work-piece to break its bond
with the die and, as this linkage angulates farther, this
force progressively decreases so that the work-piece will
the ejector in its lowered or inoperative position;
not be shot at great speed from the die but is more gently
urged from the same without injury to the work-piece.
FIGURE 5 is a view similar to FIGURE 4 and show
ing the ram or tool-slide in its raised position and the
I have also found that by actuating the knee of the toggle
position of the operating parts of the ejector ejecting the
work-piece from the die;
joint linkage by a to-and-from movable member, which is
adjustable toward and from said knee, the extent of the 60
FIGURE 6 is a transverse sectional view taken sub
stantially on line 10-10 of FIGURE 5 to illustrate fur
angulation of the linkage, from its straight line position,
ther details of construction and location of parts; and
may be varied to alter the length of the ejection-stroke to
FIGURE 7 is a transverse sectional view taken sub
meet the necessary requirements without reducing the
application for any given Work-operation of the press and 65 stantially on line 11—11 of FIGURE '5.
The coining-press here shown is a, so-called, vertical
which adjustment assures a constant end-point cut-o?? of
column toggle press, wherein a press bed 10 is elevated
the ejection-movement or stroke.
from and suitably anchored to a foundation or floor
The main object, therefore, of this invention is to pro
11; and, from the opposite ends of said bed, arise col
vide a novel work-piece ejector or knock-out mechanism
for coining-presses which is of a compact construction 70 umns 12 and 13, forming the side frames of the press,
upon the upper ends of which a crown 14 is supported
embodying the above stated discovery and so designed as
and spans said columns, thus overlying said bed. Tie
to be mounted under and to the bed of such press and
rods 15 pass through said columns and have their oppo
3,053,122
3
4
site ends extending through openings in said crown and
bed, respectively, at their four corner portions, the ex
tremities of said rods being‘ threaded to receive nuts 16,
which bear against the crown and bed to tie and hold
the parts of the frame in ?xed relation to each other.
ends pivotally connected by a common pivot pin 50,
upon which is journalled a roller 51 centrally disposed
between the overlapping ends of said pairs of links. The
, A ram or tool-slide 17 is disposed between and mounted
other or upper ends of the pair of links 48 are mounted
for pivotal movement on a cross-pin 52 having its ends
mounted in bearing-openings 52a in opposite side mem
bers of the ejector frame 41 (see FIGS. 1, 2 and 6), said
in suitable guideways 17*’- on the columns 12 and 13 for
end portions of said cross~pin 52 extending through
vertical reciprocation and is supported from the crown
elongated slots 42b in the opposite side members of the
14 and actuated by a toggle-linkage 18 (sometimes called
ai“knuckle-joint”), although other suitable means may 10 carriage 42 so as to allow for the to-and-fro movement
of the ‘carriage. The other or lower ends of the pair of
be employed. The upper end a of this supporting con
links 49 are mounted for pivotal movement on a cross-pin
nection 18 is suspended from the underside of a bear
53 having its ends mounted in bearing openings 5381 at the
ing-block 20 by means of a pivot pin 19. The bearing
block 20 is disposed in juXta-relation with the underside
lower ends of the opposite side members of the carriage
of that portion of the crown 14 overlying the ram 17 15 42 (see FIGS. 4, 5 and 7). With this arrangement, the
pad 45 is moved toward the bed 10 to effect the ejection
and has its end portions slidably mounted in guideways
of the work-piece W from the die or holder B, when the
21 carried by the side frames 12 and 13, so that said
toggle-linkage L is broken as shown in FIG. 5-—or, in
bearing block 20 may be adjusted to vary the position of
other words, when the linkage is not in its normal straight
the pivot pin 19 vertically relative to the bed 10.
ened position as shown in FIG. 4—-whereby the carriage
The stroke of the ram 17 may be varied or adjusted by 20 42 is moved upwardly by said linkage toward the bed 10;
a mechanism indicated at R (FIGS. 1, 2 and 3) which is
and this movement of the toggle linkage L is accomplished
fully described in my US. Patent No. 2,910,898.
by a cam member 54 actuated in timed relation with the
The ram or tool-slide 17 is actuated by an electric
movement of the ram or tool-slide 17.
motor 32 mounted on top of the crown 14 and which
The cam member 54 preferably comprises an oscilla
drives a clutch-brake mechanism 33 mounted on a back 25 tory segmental member pivoted intermediately of its
shaft 34 journal'led on the side frames 12 and 13. A
ends, as at 55, and disposed between and intermediately
pinion 35 fast to the shaft 34 meshes with gear 36 fast
of two links arms 56 pivotally mounted at one of their
on crank-shaft 37 extending across the back of the press
ends, as at 56“, to brackets 57 on the ejector frame 41,
frame (see FIGS. 2 and 3) and also journalled on side
frame members 12 and 13.
A pitman-rod 38 connects to the crank of the crank
shaft 37 to the center pivot c of the toggle linkage 18
and the lower link of said linkage is pivoted at b to the
and this cam member is so positioned as to have a cam
rning portion, beyond its pivot 55, extend into the frame
41 of the ejector unit so that an edge portion of the mem
ber 54 will engage and bear against the roller 51. The
portion 54a of said edge of the cam member 54 is on a
top of the ram or tool-slide 17', whereby the latter is re 35 gradient radii, with respect to pivot 55, to provide the ef
fective camming surface and the succeeding adjacent por
ciprocated in its guideways 17a so that the tool or die
tion 54*’ is on a uniform radii to provide the dwell of the
T may be moved to-and-fro relative to the work-piece W
camming surface at the end of the effective movement of
in or on the holder or die D supported by the press-bed 16.
the cam 54“. The other portion of the cam member 54,
After the work-piece W has been shaped, formed or
on the other side of the pivot 55, is pivotally connected
otherwise worked upon by the tool or die T or D, it is
at 58 to one end of an extensible connecting rod 59, the
ejected automatically from the die or holder D on the
other end of said connecting rod being connected, as at
bed, after the ram or tool-slide has receded sui?ciently,
375, to the crank of the crank shaft 37. This connection
by the improved ejector mechanism E shown in detail in
of the connecting rod 5? with the crank shaft 37 is such
FIGURES 4, 5, 6 and 7 and shown in elevation on the
that ?ie cam member 54 is oscillated by the movements
press in FIGURES 1, 2 and 3.
of the crank shaft 37 so as to cause the cam surface 54a
As shown, the ejector mechanism or unit E is posi
to break or angula-te the toggle linkage L from its position
tioned under and depends from the under surface of the
shown in FIGURE 4 to move the pad carriage 42 toward
bed 10 by means of suspended bolt rods 40 which pass
the bed 10, when the ram or tool-slide 17 has receded
through the four corners of the suspended frame struc
sufficiently upward from the bed. This results, ?rst, in
ture 41 of the ejector. A ram or carriage 42 is disposed
within and mounted in guideways 43 and 44 on the frame 50 the forceful breaking of the bond or grip of the work
piece with the walls of the die D and then urges the work
41 for to-and-fro vertical slidable movement in the guide
piece with less force from the holder or die D; and,
ways relative to the bed 10. The carriage 42 is pref
thereafter, the carriage 42 drops by gravity, from its
erably of a hollow rectangular frame within which is ar
position shown in FIG. 5 to the position shown in FIG. 4,
ranged its operating toggle-linkage L to provide a com
pact construction of few parts readily actuatable from 55 returning the ejector pad 45 to its normalposition between
the effective work-performing strokes of the ram or tool
the crankshaft 37.
slide 17.
The carriage 42 has on its top-cross-piece a “knock
out” pad 45 positoned to align with the holder or die D,
supported in the usual manner on the press-bed 10, to be
either projected into or through a suitable opening in said
bed or to contact and push ejector pins 46 (sometimes
carried by the holder or die on said bed) as the exigencies
The other or lower ends of the link arms 56 are con
nected to a cross-head 60 which has an intermediate por
tion formed with a passage through which slidably ex
tends a threaded rod 61 pivoted at one end, as at 62, to a
cross-pin 63 mounted at its ends in the frame 41. Jam or
locking nuts 64 and 65 are threadedly disposed on the
of the particular Work being done may require. The pad
threaded rod 61 at opposite ends respectively of the cross
45 has a depending threaded stern 45a threadedly extend
ing into a threaded aperture 42“ in the top cross-member 65 head 60 so as to maintain the cross-head 60 in its ad—'
justed positon on the threaded rod 61.
of the carriage 42 in order that the pad may be properly
The length of the to—and-fro movement of the carriage
adjusted, relative to the work to be performed, by an im
plement inserted in openings 45'b therein. A portion of
42 carrying the pad 45 may be varied by the position of
the aperture 428 is fashioned, as shown in FIGS. 1, 4 and
the cross-head 60 on the rod 61, as this adjustment shifts
the axis of the cam member 54. Therefore, it is clear
5, to provide a split clamp-ring 47 partially integral with
the carriage 42 so that the stem 4551 may be clamped in
its adjusted positions.
The toggle-linkage L prefer-ably comprises a pair of
that, by shifting the crosshead 60 to the right on the rod
61 (by suitable adjustment of the nuts 64 and 65), the
center distance of the pivot 55 from the roller 51 is in
creased, thereby reducing the effective operation of the
49, each pair of links having their adjacent overlapping 75 cam surface 54“1 upon the linkage and, hence, the extent
spaced and coextensive links 48 and a similar pair of links
5
3,053,122
6
of angular movement of the toggle links 48 and 49, thus
2. A work-piece ejector, as set forth in claim 1, where
reducing the distance of travel or movement of the car
in the actuating means includes an oscillatory cam mem
ber mounted on a shiftable axis and having its cam sur
face positioned and formed to exert a continuous pres
riage 42 and its knock~out pad 45; and it is also clear that
the converse is true. Where necessary to coordinate this
shifting of the cam with respect to the timing of the dwell, 5 sure on said toggle-joint during its angulation of said
this can be compensated by suitable adjustment of the
toggle-linkage and terminating in a dwell which discon
extensible connecting rod 59.
tinues said angulation; and means for adjusting said axis
Since the toggle-linkage L is always in a straight-line
of said cam member to shift said camming surface and
position, as in FIG. 4, at the beginning of the ejecting
the dwell thereof relative to said toggle-joint for increas
stroke of the ejector pad carriage 42, the force exerted is 10 ing or decreasing the effective camming action and, thus,
at its maximum at this point, and, since the dwell 54b
varying the extent of the ejecting stroke of said carriage,
always occurs at the end of the ejection stroke, the end
according to the requirement of ‘different work-pieces,
point of the ejection movement is always constant, which
while retaining the stopping-point of said angulation con
is advantageous in the timing of feeding mechanism (not
stant for any given adjustment of the cam member.
shown) for the press.
3. In a work-piece ejector for a heavy~duty die-stamp
When the ejector E ‘of this invention is used in a ver
ing press, particularly of the coining type having a die
tical position, as shown in the drawings, no additional
supporting bed and a die-ram movable to and fro rela
means is necessary for returning the carriage to its nor
tive to the bed-die, the improvement comprising an ejec
mal position, retracted from the bed 16, as shown in FIG
tor~frame adapted to be disposed under a bed of a press;
URE 4, because the particular construction herein em
a carriage mounted in said frame for vertical reciprocal
ployed permits the weight of the carriage 42 to drop by
movement to and fro relative to the press bed; a work
gravity, thus bringing the toggle linkage L to its straight
line normal position.
piece ejector-pad mounted on said carriage for vertical
adjustment relative to said carriage and said press-bed;
However, should positive means he desired to return
the carriage 42, this has been done by mounting an air 25 a toggle-linkage pivotally connected at one of its ends to
said ejector-frame near the upper end of said carriage
cylinder under the bed, which is coordinately controlled
and having its other end pivoted to the lower end por
to return said carriage to its normal position.
tion of said carriage, whereby the carriage is supported
The ejector mechanism E therein shown and described
by said linkage and the weight of the carriage biases said
may have other applications of use but is particularly use
ful and desirable when employed in combination with 30 linkage to its straightened position; and an operable cam
coining-presses as therein described.
member formed and positioned to engage said toggle
linkage to intermittently angulate said linkage, causing
From the above, it should be clear that a device con
structed in accordance with this invention as herein shown
said carriage and its ejector-pad to move toward the
and described attains all of the objects aforementioned
press-bed to eject the work-piece therefrom, and then
with their attendant advantages. While the preferred
allowing the carriage to gravitate and straighten said
form of the invention has been shown and described 35 toggle-linkage for another angulation thereof.
herein, it is to be understood that various changes may
4. The subject matter of claim 3 characterised by the
be made in details of construction and in the combina
cam member being mounted on an axis carried on a link
tion, arrangement and organization of the several parts
pivoted at one end to said ejector-frame and having its
without departing from the spirit of this invention and
other end slidably adjustable along a rod carried by said
that the invention is only to be limited by the scope of
frame, whereby the extent of the ejecting stroke may be
the appended claims.
varied, and means on said cam member adapted to be
That which is claimed, as new and to be secured by
connected with the actuating means of the press in timed
Letters Patent, is:
1. A work-piece ejector for a heavy-duty die-stamping 45 relation with the press operation.
press, particularly of the coining type having a die-sup
5. A work-piece ejector, for a heavy-duty press of the
porting bed and a die-rain movable to and fro relative
coining type, comprising a frame adapted to be disposed
to the bed-die, the improvement comprising an ejector
under a bed of a press; a carriage positioned in and
frame adapted to be disposed under a bed of a press;
mounted on said frame for vertical reciprocal movement
a carriage mounted in said ejector-frame for vertical re~ 50 to and fro relative to the press-bed; a work-piece ejector
ciprocal movement to and fro relative to the bed of the
pad carried by and movable with said carriage and posi
press; a toggle-linkage pivoted at one end to and sus
tioned to eject a work-piece from the press-bed and then
pended from said frame, the other lower end of said
recede from said bed; a pair of spaced links disposed
linkage being pivoted to and supporting said carriage so
that said toggle-linkage is in a straight-line position, when 55 within said carriage and pivotally suspended at one of
their ends from a cross-pin extending through elongated
the carriage is in its lowermost position; means for mount
slots in the upper end portion of said carriage and
ing said ejector-frame under the die-bed of the press;
mounted in said frame at its ends; a second pair of
an ejector-pad carried by and movable with said carriage
spaced links having one of their ends pivotally connected
and positioned to align with a work-piece on the die-bed
of the press to eject the work-piece during the movement 60 to the free ends of said ?rst pair of links, respectively,
and having their other ends pivoted to the lower end
of said carriage toward said die-bed; and actuating means
for causing the ejecting stroke of the ejector-pad and
allowing said carriage and its pad to recede to its lower
most position by gravity after each ejecting stroke, said
actuating means being carried by said ejector-frame and 65
positioned and arranged to exert a continuous pressure
on the toggle-joint of said linkage to angulate said link
portion of said carriage, whereby the carriage is sup
ported by said linkage and the weight of the carriage
biases said linkage to its straightened position; a roller
disposed centrally between said pairs of links and jour
nalled on the pivots connecting said pairs of links, and
a cam member formed and positioned to engage said
age from its straight-line position periodically for rais
roller and intermittently angulate said linkage from its
ing said carriage and its ejector-pad from its lowermost
straight-line position for raising said carriage and its
position toward the press-bed to eject a work-piece from 70 ejector-pad to eject a work-piece from the bed-die of the
its die, whereby the maximum initial force of said actu
press with the maximum initial force being exerted at the
ating means is exerted at the beginning of said ejecting
beginning of the ejecting stroke and progressively de
stroke and said force progressively decreases during the
creasing during the remainder of said ejecting stroke.
remainder of said ejecting stroke as the toggle-linkage
angulates farther from its straight-line position.
75
(References on following page)
3,053,122
8
7
2,056,402
2,342,928
2,355,556
2,547,304
References Cited in the ?le of this' patent
UNITED STATES PATENTS
247,465
477,899
486,3 87
522,084
1,294,993
1,415,459
Long _______________ __ Sept. 20‘, 1881
Jones _______________ __ June
Snaith ______________ __ Nov.
Parkinson ___________ __ June
Wilcox ______________ __ Feb.
28,
15,
26,
18,
1892
1892
1894
1919
Limont ______________ __ May 9, 1922
5
2,716,900
Klocke _______________ __ Oct. 6,
Fischer _____________ __ Feb. 29,
Peterson _____________ __ Aug. 8,
Broscomb ____________ __ Apr. 3,
Barkham ____________ __ Sept. 6,
1936
1944
1944
1951
1955
FOREIGN PATENTS
101,939
Austria _____________ __ Dec. 10, 1925
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