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Патент USA US2131057

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Sept. 27, 1938.
J. |_. LEWIS
2,131,057
METHOD AND APPARATUS FOR MAKING CAN COVERS
Filed July 3, 1934
7 Sheets-Sheet 1
Sept. 27, 1938.
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2,131,057
METHOD AND APPARATUS FOR MAKING CAN COVER-S
Filed July 5, 1934
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METHOD AND APPARATUS FOR MAKING CAN COVERS‘
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METHOD AND APPARATUS FOR MAKING CAN COVERS
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METHOD AND APPARATUS FOR MAKING CAN COVERS
Filed July 3, 1934
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METHOD AND APPARATUS FOR MAKING CAN COVERS
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2,131,057
Patented Sept. 27, 1938 ’
UNITED STATES PATENT‘ OFFICE
METHOD AND APPARATUS ‘FOR MAKING
CAN COVERS
~
John L. Lewis, Hamilton, Ontario, Canada, as
signor to American Can Company, New York,
N. -Y., a. corporation of New Jersey
Application July 3, 1934, Serial No. 733,666
13 Claims.
The present invention relates to the art of
manufacturing can covers and the like and has
particular reference to the manner of uniting
small pieces of sheet material into single units
5
and of forming can covers from those units.
In the manufacture of can parts from sheet
metal vast‘ quantities of relatively small pieces
of small pieces of sheet material to provide a single blank of suf?cient area from which a can
end or the like may be formed.
. .
-.
A further object is the provision of a method
of simultaneously preparing marginal edges of a
plurality of'pieces of sheet material for inter
locking engagement prior to ‘their being united
pieces are too small for can parts such as can
interlocking and uniting previously prepared
ends.
marginal edges of a plurality of pieces of. sheet '
material to form. a single blank.
,
into a single blank,
'
I
Another object is the provision of a method of 10
A still further object is the provision of a.
method of forming a multi-part sheet metal blank 15
or oval can ends or other non-circular can parts
and can end in an organized mechanism which
may be cited. In one can end forming procedure,
strips of metal are ?rst cut from a_ sheet in ac
cordance with a cutting layout known in the
industry as a stagger layout and in this each
strip is formed with wide and narrow parts which
automatically brings together ‘a plurality of small
dove-tail into adjacent strips in the sheet. A
stagger layout provides the greatest cutting
pieces of sheet metal, which unites them into a
single blank and which forms a can'end from ,
the blank.
20
.
A further object of the invention is to provide
a composite sheet metal blank of greater strength
and comparative rigidity against bending, by
ef?ciency for a given size of sheet.
In such a layout there is always a waste space
forming such blank with one or more lines at ~
at one or both ends of alternate strips which is
too small for the can end of that size. These
of said sheet metal.
which the blank is provided with four thicknesses 25
»
duction of multiple-part full size can ends that
Numerous other objects and advantages of th
invention will be apparent as-it is better under
stood from the following description, which,
taken in connection with the accompanying 3'0
drawings, discloses a" preferred embodiment
the present invention is particularly adapted.
thereof.
. end pieces are known as recovery pieces and
occur in great numbers.
It is to the using of
30 such recovery pieces by uniting them vfor the pro
.
It might be mentioned that a multiple-part can
end formed in this manner is satisfactory for
cans containing certain products such as granu
lated or powdery materials which do not have to
present invention, Fig. 2, being a continuation
be hermetically sealed. There is a large ?eld of
use for cans of this kind for scouring powder and
?gures broken away and parts‘ of Fig. 1 shown
the like.
in
'
_
The invention therefore contemplates the per
manent joining together of a plurality of re
covery pieces or the like to make blanks and
further contemplates the forming of can ends or
the like therefrom. The invention also contem
45 plates an e?icient and economical manner of
forming these blanks and can ends in an organ
ized mechanism which automatically brings a
plurality of the pieces together, and unites them
into a single blank and which forms a can end
50 from the blank.
An object of the present invention is the pro
vision of a method of forming can ends or the
like from a blank comprising a plurality of united
55
sion of ,a method of joining together a plurality
of virgin stock are recovered as by-products.
These individual pieces represent quite a waste
of material if they cannot be used. Usually such
As an outstanding example of such manufac
ture and the production of relatively small pieces
15 the operations of blanking and forming of round
40
(01. 113-1)
smaller pieces of sheet material.
Another object of the invention is they provi
Referring to the drawings:
}
Figures 1 and 2 are top plan views of an appa- _
ratus for carrying out the method ‘steps of the 35
of the right hand end of Fig. 1 ‘with parts of both
section;
'
>
I
>
Figs. 3, 4, 5 and 6 are enlarged transverse sec
tional views taken substantially along the re
spective lines 3-3, 4—4, 5—5 and 6—5 in Fig.
1, Fig. 3 being shown with its movable parts in
40
raised position, the section line :c—:c shown
the-rein indicating where the line of section of >45 '
Fig. 1 is viewed as to the parts adjacent the sec- _
tion line 3—3 of that ?gure, but Fig. 1 shows the
operating parts in lowered position and thus
differs fromFig. 3, whereas the section line y—y
in Fig. 4 indicates where the line of section of 50
Fig. 1 is taken as to the parts adjacent the sec
tion line 4—-4 of that ?gure;
.
Figs. '7 and 8 are enlarged fragmentary sec
tional views showing di?erent positions of the ,
oscillating or edging member illustrated in Fig. 6; 55
2,131,057
Fig. 9 is an enlarged transverse sectional view
taken substantially along the line 9--9 in Fig. 1;
Figs. 10 to 14, inclusive, are fragmentary sec
tional views of the central part of Fig. 9 illus
strating different positions of the moving parts
or edged ends passing each other.
shown therein;
substantially along the line I5-I5 in Fig. 1; .
Fig. 16 is an enlarged transverse sectionalview
hooked edge of the lower section and shifts it
back toward its original position. In doing so
the hooked edge of the lower section‘ looks with
the hooked edge of the upper section and both
taken substantially along the broken line I6-—l6
sections are then carried transversely to the 10
'
Fig. 15 is a longitudinal sectional view taken
10
engages the lowermost of the two lifted sections
and moves it beneath the other section, the hook
1
A second transverse slide associated with the
other table now moves forward and engages the
in Fig. 1;
1 center of the station. This leaves the interlocked
Fig. 17 is a fragmentary perspective view, marginal edges of the sections between the bump
partly shown in section of a can end produced __ ing elements. Actuation of these elements which
according to the method steps ‘of the present follows compresses the interlocked edges and ef
fects a permanent locking and uniting of the
invention;
Fig. 18 is a perspective View of the skeleton two sections into a' single composite blank.
‘ Immcdiately'following this last step the com
scrap part of the blank remaining after the’c'ut
ting, forming and removal of the can end; and
Figs. 19, 20, 21 and 22 are fragmentary ele
vations showing different positions of the blank
holding and scrap ejecting devices illustrated
is advanced into‘ the path of an oscillating feed
lever which transfers the blank along and down
curved guide bars andvinto the. can end forming
in Fig. 16, a part of Fig. 22 being shown in sec
tion and all of the views being at a slightly
between guides and is momentarily held by blank
reduced scale from that of Fig. 16.
p
The method steps of the present invention are
best carried out in an organized apparatus, the
principal parts of which are illustrated in the
drawings. In these steps two recovery pieces are
simultaneously fed in a step by step movement
30 in a straight line. of travel through a. series of
stations. These stations ‘are indicated in the
drawings by capital letters and comprise a feed
7 ing station A, a trimming station B, a notching
station C,.a transverse feeding station D, an edg
35 ing station E, an assembling station F and a
forming station G.
.
.
At the station A the recovery pieces or blank
sections enter the apparatus in spaced parallel
relation and engage parallel guide bars located
40 on opposite sides. A feeding device comprising
reciprocating feed bars engages behind the blank
sections and advance them from the station A
‘to the trimming station B.
At this latter sta
tion the sections are arranged on each side of a
45 gauging. and trimming device and gauge ?ngers
operate outwardly to align the sections against
the guide bars. A trimming die'then descends
from above and cuts or trims opposing inner
marginal edgesof the sections.
50
.
After this operation the vfeeding device again
advances the trimmed blank sections, this time
into the notching station C where the sections
are arranged on opposite sides of a notching de
vice. This device descends and cuts out notches
the ends
55 in
sections.
of the trimmed edges of the blank
tion so that both are brought closer together.
At the next forward movement of the feeding
device both notched sections are conveyed into
the edging station E, where their opposing mar—
ginal edges are arranged adjacentto and on
either side of an oscillating edging tool. Oscil
lation of this tool bends the marginal edges into
oppositely formed hooks.
station G. At .station G the blank is positioned
holding ?ngersvvover‘ a. die mechanism. , A punch
descends upon the blank and cooperates with the
die. mechanism in cutting out, forming and em- ‘
bossing a can end. This leaves the scrap skele
ton on’top‘of the die and still held by the ?ngers.
‘As "the punch rises on its return stroke, the can
end is automatically ejected from the apparatus. 30
‘The holding fingers then remove the scrap pieces:
which are no longer united and eject them into
any suitable place of deposit.
"
A preferred form of apparatus for carrying
out the method steps of the invention comprises -35
in part a long narrow main frame 2| which sup- "
ports the working parts located at most ‘of the
various stations. This framev 2| carries spaced
tablemembers 23; 24 (Figs. 1, 3 and 4) which
provide support for recovery pieces or blank sec 40
tions a of ‘sheet material, these pieces consti
tuting the work for cutting and bending opera‘
tio-ns which take place in the manufacture of can
ends.
The particular form of recovery piece (1
shown in the drawings has a straight guiding
,edge b, a substantially parallel edge 0 and con
necting irregular end edges d.
The table member 23 is secured to and ex
tends throughout the full length of the frame 2|
and the table member 241s similarly secured and (
extends just beyond the station C or approxi- '
‘mately one half of the frame length. The'two
members are parallelto each other and- are lo‘
cated adjacent to the edges of the-frame.
Two blank sections or recoveries a are simul- !
taneously brought into the apparatus at the sta-'
The feeding device new advances the notched
sections to the station D where one section is
engaged by a cross slide. This cross slide trans
60 versely moves the section toward the other sec
‘
Following this step the. edged blank sections
70
posite blank is engaged by the feeding device and
are moved forward into the assembling station
F. .At this station the sections are positioned on
rising tables arranged on opposite sides of a
pair of bumping elements. These tables are then
elevated, one slightly above the other. A trans
verse slide associated with one of the tables ?rst
tion A in any suitable manner as by a recipro
cating feeding device generally indicated bythe
numeral 28. At this station the blank sections
are supported on the table members 23,25 with .60
their inner edges c projecting onto the top sur
face of a plate 3|. This plate is interposed
between the table members leaving longitudinal
slots 32 for the feeding device. -The top of the
plate 3| is ?ushi with the top of the table mem- _,
bers and‘ is countersunk in a recess .33 formed in‘
the top of the frame 2|.
,
The'two associated blank sections are simul
taneously fed longitudinally over the table mem
bers and over the plate in a straight line path of ,
travel and through the various stations. The
feeding device 25 effects this advancement in a
step by step movement.
'
Feeding device 26 comprises ‘a pair of spaced
parallel feed bars 35, 36 (Figs. land 3) which are ,15
~ 3
’ 2,131,057
simultaneously reciprocated in any well known
manner and in time with the other parts of the
mechanism. Each bar 35, 36 slides upon the top
of the frame 2! and is held against vertical dis
placement in the openings 32 by overhanging ex—
down through a hub 69 formed in the frame 2|
where it may connect with any suitable operat
ing source of power.
tensions 38, 39 projecting laterally from adjacent
vertical edges of the table members and plate
respectively. Pivoted feed dogs 4| are mounted
on pins 122 secured in the respective feed bars
10 35, 36 and normally extend up for engagement
with the rear edges (1 (left hand edge as viewed
in Fig. 1) of associated blank sections a.
During the transfer of the blank sections
through the ?rst two operating stations they ‘are
15 guided along with their outer edges b against
guide bars 44, 45 secured on top of the respective
table members 23, 24. These guide bars extend
the full length of the table members on which
they are mounted.
20
‘
In the ?rst forward advance of the feed bars
35, 36, the two blank sections are moved from
the station A into the station B where they pass
one on each side of a trimming device generally
indicated by the numeral 46 (Figs. 1 and 3) . Be
25 fore the trimming action takes place at this sta
tion and on the return stroke of the feed bars,
gauging instrumentalities operate on the inner
edges c of the two blank sections and square ‘up
or align their outer edges 11 against the guide
30 bars M, £35.
This alignment is effected by a pair of cam
actuated levers 41 the forward ends of which
are disposed in slots 48 formed in the plate 31.
The two levers are in a plane below the blank
sections and are pivoted on a stud 49 which is
secured in the top of the plate 3|.
Each lever
at its rear end carries a cam roller 5| and these
rollers engage opposite sides of a continually ro
tating cam 52. The cam 52 is secured to the
40 upper end of a vertical shaft 53 which is j ournaled
in and carried by the plate 3!. Cam and shaft
are rotated in any suitable manner.
A tension
spring 53 is interposed between the rear arms of
levers 4‘! adjacent the cam rollers and this in
sures proper engagement between rollers and
45
cam.
The levers cross each other at the rear or be
yond their pivot stud in scissor fashion. A ver
tical extension 55 is formed at the forward end
of each lever and extends up above the plane of
50 the blank sections a each extension engaging the
center of the edge 0 of a blank section during
the gauging action just described. An element
of the trimming device 46 now descends from
above on the gauged blank sections and shears
55
off a trim alongside of each 0 edges, reducing the
blanks to a predetermined width with a new
trimmed edge e and making opposed side edges
The, lower’ outer end of each side wall 6| is
notched out to hold a hardened steel trimming T
or shearing blade 1|. Cooperating with these
blades, when the plunger moves down, are sta
tionary blades 12 secured in notches 13 formed
in the plate 3| and in the outer edge walls of its
slots 48.
7
Each scrap or trim as soon as it is severed
from the blank section falls through the slot 48
(Fig. 3) into a connecting inclined slot ‘I5 cut
through the frame 2| and from ‘thence the scrap
pieces‘ are discharged from the mechanism. Ask?
the plunger is raised on its return stroke follow
ing the trimming operation stripper plates 14
which are secured to the end walls 64 of the block
65 hold the trimmed blank sections against up
ward displacement. The blank sections areiv
thereupon further advanced by’the feeding de
vice 26 into the notching station C.
At this station the blank sections are sup
ported on the table members 23, 24 and also on
a plate 8! (Figs. 1 and 4) which is similar in
cross-section to the plate 3! and. which also has
a ?at top surface flush with the tops of the
table members. This plate is secured within the
countersunk recess 33 of the frame and is pro
vided with vertical side edges and overhanging?
extensions 82. which cooperate with the exten
sions 38 in the table members for further guide
ing the feed bars 35, 36.
Both blank sections are held against outward
transverse displacement while at the station by'
the guide bars 44, 45 and at their inner edges
by short guide bars 83.
The short guide bars
are mounted in hardened steel die blocks 85 see
cured in countersink recesses 86 formed in the
top of the plate 8|. There are two of these dies‘
blocks 85 one on each ‘side underlying the inner
marginal zone of a blank section adjacent its
trimmed edge e. Die openings’ 88‘ having cut
ting edges 89 are formed in each end of each die
block 85 and these cutting edges are in vertical
alignment with and beneath the inner corners
of the positioned blank sections as they lie in
station C.
'
Four vertically movable punches 92 are posi
tioned inside of the corners and extend above the
blank sections each punch having a lower stepped
end which extends down into one of the die open
ings 88. One of the steps or shoulders in the
punch end constitutes a cutting edge 93 which
cooperates with its associated cutting edge 89 of .»
the die block when the punch moves down for
the notching operation.
Each punch 92 is square in cross-section and
1) and 6 parallel.
The trimming element comprises an inverted
moves within a slide groove 95 formed in a cap
93. There are two such caps bolted on opposite-1
U-shaped plunger having depending side walls 6|
sides of a block section 9'! which like the section
(Fig. 3) and a top connecting wall 62. The de
pending walls slide within grooves 63 formed in
end walls as of a rectangular block section 65
which is preferably an integral part of the plate
3! and which extends up above the plane of travel
of the blank sections passing through the ma
chine.
The trimming plunger is vertically reciprocated
70 in time with the other operating parts of the mech
anism and for this purpose is secured to the upper
end of a vertical shaft 61. A reduced upper end
of the shaft passes through the plunger wall 62
and is secured in position by a locknut 68. The
75 shaft 6? slides in the block 65 and also extends
65 of the plate 3| is preferably an integral part
of the plate 8!.
At their upper ends the punches 92 are formed
with round threaded shanks 93 each shank being 05
threadedly and adjustably secured in a grooved
nut 99 disposed within a T slot I9! formed in
a head plate I32. There are four of these slots
one on each corner of the plate. By turning
the nut 99 on the shank its punch 92 may be
vertically adjusted at will so that there may
be had a desired vertical relation between the
cut edges 93 and 89.
After adjustment this re
lation is maintained by a locknut H13.
All four punches 92 are simultaneously lowered
4
72,131.05?
and raised for the notching operation by a down
- and up movement of the head plate I02.
This
plate I02 is secured to the upper shouldered end
of a vertical shaft I 05 and is held in position
by a locknut I06. Shaft I05 slides in a bearing
I61 formed in the block 91 and in a hubv I08
formed on the bottom of the frame 2I. Like
the shaft 61 of station E, shaft I35 extends be
low the hub where it may connect with any suit
10 able operating means imparting the proper timed
reciprocation.
As the head plate I02 and punches 92 move
down. the cutting edges 93, 89 first engage the
corners of the blank sections between them and
15 then sever the engaged parts from the rest of
the blank. This action converts the two blank
sections a into notched blank sections 1‘ and g
each section havingncorner notches h (Fig. 1).
The cut out corners‘ fall through the openings
20 88 into larger openings III formed in the plate
8I and thence through connecting openings II 2
in the frame 2I thus discharging from the ap
paratus. During the upward or return move
ment of the punches which immediately follows
26 the caps 96 serve to strip the blank sections
from the punches.
The next forward movement of the feeds bars
35, 36 carries both blank sections 1‘, a forward
into the station D. The blank sections are in no
30 way altered at this station but the blank 1‘ is
moved transversely or closer to the blank g as
shown in Figs. 1 and 5. During the forward ad
vance from the station C the outer edges b of
the blank sections move along the bars 44, 45
\8;v4hile their inner edges e are guided by the bars
The trimmed and notched edge e of the section
a, as it enters the station D, passes into a guide
bar H5 which is mounted in a groove II6 cut
longitudinally in the top of a plate H1. The
plate is flush with the top
of the table members 23, 24 and supports both of
the pieces f and g.
The plate II1 like the plates 3|, SI of the pre
45 ceding stations rests within the recess 33 of the
frame and its vertical edge adjacent the table
. top surface of this
member 23 is provided with an overhanging ex
tension I I8 for guiding the feed bar 35 at this
station. This plate H1 is narrowerv than the
50 plates 3|, BI and is located to one side of the
recess 33, a spacer block II9 being used to ?ll
the space on the other side.
As the blank section piece 1‘ moves into the
station D, it leaves both guide bars 45, 84 which
55 terminate short of the station, and passes with
its outer portion on top of a cross-slide I2I. Its
edge by thereupon engages and moves along a
guide bar I22 while its notched edge e passes free
of any guides. This guide bar is secured to the
60 top of the cross-slide I2I and during its guiding
action is in alignment with and forms a continu
ation of the guide bar 45. It is the cross-slide
with its guide bar that carries the blank section )‘
transversely across the table members and
65 closer to the blank section 9.
This is effected by movement of the cross-slide
in any suitable manner as through a connecting
rod I25, pivotally secured on a shaft I26 mounted
in hubs I21 formed in the slide. The slide is
70 provided with laterally projecting tongues I28
(Fig. 5) adjacent its bottom which move within
grooves I29 formed in a slide-way I3I (Fig. 1)
cut in the top of the table member 24.
Cross movement of the slide carries the blank
75 section 1‘ over the top of the plate I I1 and brings;
it to rest against a guide bar I33 which is parallel
to the bar II5, being mounted in a groove I34
formed in the top of the plate I I1. In this posi
tion both blank sections 7‘. y are in proper rela
tion to be moved forward into the edging station '
E for the next operation.
For this next step advancement a new feed bar
I36carrying spaced- pivoted dogs I31 is provided
for engagement with the blank section 1‘. The
bar I36 is secured to the forward end of the bar 10
36 by a spacer block I38 (Fig. 5) and in its. action
may be considered as an offset continuation. of
the bar 36. It is actuated by the bar 36 and is
guided along one side by a vertical edge of the
plate I I1 and is held down under an overhanging
extension I39.
During the forward advance movement, the
inner notched edges e of both blank sections pass
beyond the influence of the guide bars I I5, I33
and enter grooves formed in opposite sides of an 20
edging tool (Figs. 1 and 6). The outer edge of
blank g is still held against the guide bar 44. The
outer edge of blank ,1‘ upon leaving the bar I22
passes alongside of a guide I43 which is parallel
to the bar 44.
At station E the blank section g is supported
in part on the table member 23 and in part on a;
cooperating plate I44.
This plate is disposed
within a recess I45 formed in the top of the frame
2| and its top surface is flush with the top‘ of 30
the table member. It is provided with a shoul
dered vertical edge I 46 which cooperates with the
edge of the table member in guiding the feed
bar 35.
On the opposite side of the station the blank 35
section 1‘ is supported in part on the plate I44
and in part on another table member I48 which
is secured to the top of the frame 2|. This
table member is formed with a shouldered vertical
inner edge I 5I which cooperates with a shouldered
vertical edge I53 formed in the plate I44 for
guiding the feed bar I36.
The blank sections ‘f, g in coming into the
station E pass between upper and lower stationary
edging bars with their inner edges e slightly pro
jecting beyond these bars (Fig. 6). The edging
bars comprise parallel lower bars I55, I56 which
are secured within shelf-like notches I51 cut in
opposite sides of a semi-circular longitudinal
channel or depression I58 centrally formed in
the top of the plate I 44. Upper parallel bars 50
I6I, I62 are secured in similar notches I63 out in
head members I64 of pivoted levers I65 which
are mounted on short horizontal shafts I66 held
within brackets I61 bolted to opposite sides of 55
the frame 2|.
,
The blank sections J‘, g are clamped between
these edging bars during the edging operation.
This clamping action is effected by lowering of
a pivoted clamping block I1I which rests but 60
lightly on top of the lever head members I 64
when the blank sections are passing in between
the separated edging bars I55, I6I and I56, I62.
This clamping block is mounted on a pin I12
secured in the lower end of a link I13 which may 65
be actuated in any suitable manner and in proper
time with the other working parts of the mecha
nism.
In this clamped position the projecting edges
e of the blank sections extend into the grooves‘ 70
of the edging tool, the grooves being designated
by the numeral I15 (see also Figs. 7 and 8). The
grooves are formed in edging bars I16, I11 con
stituting a part of the edging tool. The edging
bars are formed with dovetail tenons I18 which 75
5
2,131,057.
?t at the bottom within wedge shaped notches I19
formed in a tool block I8I. A clamp I82 is bolted
to the top of the block by a cap screw I83 and
the sides of the clamp engage on the top: of the
dovetail of the edging bars holding the parts of
the tool as an assembled unit.
In the edging operation the edging tool is oscil
lated ?rst in one direction and then in the reverse
direction. For this purpose the block I8I- is
10' formed with end trunnions I85 (Fig. l) which
are journaled in bearings I86 projected upwardly
from the top of the plate I44. This oscillation is
brought about by a lever I81 (Figs. 1 and 6) one
end of which is secured to one of the trunnions
15 I85 while its opposite end is connected to a link
I88 communicating with any suitable operating
means.
The lever I87 ?rst turns the edging tool in a
counterclockwise
direction into the
position
20 shown in Fig. 7. In so doing a longitudinal
projection iQI formed on the upper corner ‘of
the face of edging bar H6 and a similar projec
tion I92 formed on the lower corner of the bar
Ill come into engagement with the overhanging
25 edges e of the respective clamped blank sections 9
and 7‘ and as the tool turns further these projec
tions bend or wipe the edges of the blank sections
in opposite directions over anvil extensions I93,
Hill formed on the inner edges of lower and upper
bars E55, iBZ. At the completion of this move
ment the edge of the blank section g projects
downwardly and the edge of the section f projects
upwardly as in Fig. 7.
The edging tool now completes its oscillation
35 by reverse movement in a clockwise direction,
this time bringing into play a longitudinal
projection I85 (Fig. 8) formed at the bottom
corner of the face of edging bar I16 and a simi
lar projection I96 formed in the upper corner of
the bar ill’. This bends or edges the blank sec
tions so that the blank section 1‘ has an upstand
ing hooked edge Z and is formed into a new
edged blank section 7' while the section 9’ has a
depending hooked edge m converting it into a
453 new edged blank section it.
The edging tool moves into its original posi
tion (Fig. 6) following the edging operation and
the block i'ii releases its clamping action free
ing the edged blank sections 7', k. The feed bars
35, E36 thereupon advance these sections into the
assembling station F where the hooked blank
edges Z, m are interlocked and permanently united
in a lock and lap seam.
In passing into the station F, the blank sec
tions leave the support of the table members 23.
I43 and the plate IM and come to rest on top of
vertically movable tables 261, 2512 (Figs. 1 and 9
to 15 inclusive). Both tables overhang the plate
ltd and the latter, together with the frame 2|
have their top surfaces cut away or lowered at
203 for this purpose.
While moving on to table 2M (Fig. 2) the
blank section 7' is guided along its edge 17 by two
short guide bars 204 secured to the table, while
the blank section Zc is similarly guided with its
edge b adjacent a guide bar 265 secured to the
top of its table 282. The inner hooked edges of
the sections at such time pass along a stepped
guide block 2015 which is centrally located on the
the blank sections are above and free of the
block 206. ‘This elevating of the tables is ef
fected by a pair of edge cams (Fig. 9) located
above the tables, there being one cam for each
table.
'
Each table is carried on the lower end of a
slide 2H which is mounted for vertical move
ment in a guideway formed in a suitable frame
part 2I2. Each slide is cut through in a
rectangular opening 2I3 and an edge disc cam
2Ill is located in the opening, being eccentrically
secured to and moved by a horizontal shaft 2I5
extending through the slide.
The cam 2M and its shaft 2 I5 may be actuated
in any suitable manner so that its movement is in 15
time with the other working movements of the
machine. The cam periphery is tangentially en
gaged at all times by the horizontal walls of the
slide opening and by reason of the eccentricity
of the cam surface each complete rotation of the 20
shaft 2l5 effects a. raising and lowering of the
table slide and table associated therewith.
The cam 2M for the table 292 is preferably
larger or has a greater eccentric throw than the
other cam so that the table 262 carries the blank 2
section k to a higher horizontal position than
the section 7' occupies at the end of its lifting
movement. This is shown in Fig. 10. This per
mits a better interlocking action when the hooked
edges Z‘ and m are brought together as will be ;
later described.
~
During this lifting of the two blank sections,
they engage and lift spring pressed vertical presser
feet ZI'I which hold the blanks against displace
ment while being elevated. Each presser foot
slides within a slot 2I8 formed in oneside of a
stationary head block 2I9 which is suitably sus
pended over the tops of the tables in any suit
able manner.
.
Notched caps 22I are secured to the sides of the 40
head block and these hold the presser feet in their
slide mountings, the notched part of each cap
co-operating with an enlarged head 222 formed
on the top end of each presser foot for limiting
its downward movement. These presser foot
heads are backed up by springs223, disposed with
in bores 224 formed in the head block, and pro
vide the proper holding pressures on the blank
sections.
.
While the tables are in their raised positions,
the edge I) of the blank section 7' is engaged and
the blank is moved by a notched lug 221 (Figs. 2
and 9) formed as an integral part of a cross
slide 228 which now moves in toward the center
of the station. This slide movement carries the
55
blank section :i under the higher blank section is
its hook Z passing by the hook in of the higher
blank (Fig. 11).
1
The cross~slide 228 is interposed between the
short guide bars 204 and slides within a slot 229 60
out in the table 2%“. It is moved by the rocking
of a bell crank lever ZSI which is mounted on a
horizontal shaft 232 suitably journaled in the
frame of the machine. One leg of this lever is
secured to a link 233 by means of which it may
be actuated in any suitable manner. The other
leg carries a pin 234 on which is mounted a roller
235 which operates in a vertical slot 236 out in a
depending lug 23'! formed integrally with the
top of the plate I44, the edge Z being guided by
cross slide.
a shoulder 28'! of the block while the hook m
is guided along a groove 208.
immediately after the blank sections are in
position at station F, the tables 2llI, 202 are
horizontal side tongues 238 to provide an easier
sliding movement in the table 20! and these
tongues slide within grooves 239 out in the side
walls of the slot 229.
75 ' raised into the position shown in Fig. 10, where
'A similar cross-slide 2M (Fig. 9) is disposed
The cross slide may be formed with
6
2,131,057.
in a slot 242 formed in the table 202. This slide
is now actuated to ?rst interlock the overlap
of which aresupported on the forward end of
the frame 2|. The lower ends are supported in.
ping hooked edges of the blank sections by bring
ing the hook I of section 7' against the hook m
the forming press at station G. In passing into
the grooves the blank engages and depresses a
of the upper section and then both blank sec
tions are moved into the position of Fig. 12.
Slide 228 has been retracted by that time.
Slide 241 is formed with a depending lug 243
and may also be formed with horizontal side
10 tongues 244 which have easy sliding movement
within grooves 245 out in the sides of the table
slot 242. The depending lug is formed with a
slot 246 which engages a roller 241 mounted on
a pin 248 carried in the end of one leg of a
15 bell crank lever 249. This lever is mounted on
a horizontal shaft 251 suitably journaled in the
frame of the mechanism. Its free leg is se
cured to the end of a link 252 by means of which
it may be actuated in any suitable manner.
20
The forward end of the cross-slide 241 is
formed with a beveled notch 254 which provides
the proper slide engagement for the hook I as
just described. During this slide movement a
beveled spring held pin 211 carried in the top
plunger 255, journaled in the head block 219,
25 moves down and rests lightly on the blank sec
tion 9'.
The lowermost or engaging end of the
plunger is cut away in a notch 256 which has a
?at vertical wall 251.
This wall cooperates with
the notch 254 of the slide 241 and acts as a gauge
30 for locating the interlocked hooks l, m directly
over the center of the guide block 206, as shown
in Fig. 12. The cross-slide 241 can now recede
but the plunger pressing the blank section :1‘ down
on top of the guide block holds the hooks to
35 gether and this in turn also holds the other
blank is against movement.
A longitudinal slot 258 (Figs. 12 and 15) is
formed in the center of the guide block and
therefore comes directly under the interlocked
40 hooks. This slot communicates with a similar
slot 259 formed in the plate 144.
A bumping
hammer 261 is located and has vertical move
ment Within these slots, this hammer having a
depending stem 262 which slides in a bearing
45 263 formed in the bottom of the frame 21. Stem
262 is connected with and is actuated by any
suitable source of power. The top of hammer
261 _is cut across in a longitudinal groove 265.
end of a transfer lever arm 218. Arm 218 is
pivoted on a shaft 219 which is supported in any
suitable manner and is then swung forward to
sweep the blank into station G the arm being
actuated by any suitable means as through a 10,
link 281. The upper end of the arm is provided
with a bore 282 in which an enlarged head 283
of the spring pressed pin 211 is carried. A spring
285 is interposed between the bottom of this bore
and the pin head and a. perforated nut 286 en
15'
circles the pin and is threadedly secured to the
end of the arm.
At the station G the blank is brought to rest
against a stop block 289 (Figs. 1 and 15) where
it is centrally positioned over an inclined die 291 20v
carried on a press frame 292 of the punch blank
ing and forming press. In this position it is be
tween guide blocks 293 (see also Fig. 16). There
are two of these guide blocks, one on each side
of the die, their inner faces being in alignment 25
with the grooves 215 of the track bars 216. Each
guide block is supported on an exterior beveled
edge 294 of the die adjacent a cut edge 295 and
rests on a die base 296, being secured to this base
by screws 291.
Clamping members are used for engaging and
holding the blank in located position for a can
end blanking and forming operation. These
clamping members comprise in part four lower
?ngers 301 (Figs. 16 and 19) which are located
in pairs on opposite sides of the die each pair
straddling one of the guide blocks 293.
The ?n
gers on each side project from a vertical head
member 302 which is an integral part of a lever
303 (Fig. 1).
.
40
Each lever 303 is mounted on a vertical rock
shaft 304which is journaled in a bracket 305 ex
tending from the frame of the press.
The rock
shafts may be connected with any suitable source
of power and are actuated in proper time to move 45
the ?ngers 301 into engagement with the blank
when it comes into place.
It is also desirable
that the lever 303, its rock shaft 304 and the ?n
A longitudinally disposed anvil 266 is carried gers be raised for a purpose hereinafter described.
50 in the stationary head block 219 and in a groove Each ?nger 301 is formed with a notch 301 which
261 cut in the bottom of the block. The notch is cut in the top and end of the ?nger.
Other parts of the clamping members comprise
256 of the plunger 255 allows the latter to clear
the anvil. The hammer 261 is raised against ~ pivoted upper ?ngers 308 which cooperate with
the lower ?ngers 301 to positively clamp the blank
the interlocked blank sections and with a. press
55 ing action squeezes the interlocked hooks closer in position between them. Each upper ?nger 308
together partly forcing them into the hammer is pivoted above its associated lower ?nger 301
groove 265 as the adjacent metal bends. This on a stud 309. Each stud is secured in a lug 311
permanently locks the sections in a joint 11. as formed as a part of the head member 302 and
shown in Fig. 13 and forms a composite blank the lug extends into a recess 312 formed in the
60 101 having a smooth top surface and with its joint upper ?nger as shown in Fig. 22. The forward
end of each upper ?nger is provided with a de
n projecting from the under side.
pending projection 313 which ?ts within the
Following the completion of the assembling op
eration the cross slides 228, 241 back off and the notch 301 of the lower ?nger as shown in Fig. 20.
composite blank p- is then removed from station The rear end of the upper ?nger extends up in
a substantially vertical leg 314.
65 F by feed dogs 211 pivotally secured in feed bars
65
The leg 314 is engaged near its top end by a
212. The feed bars 212 move in corner grooves
213 (Figs. 9 and 13) formed in the upper part round nosed spring barrel 315 (Fig. 16) having
of the plate 144 and are secured to the forward a hollow opening 316 and slidably ?tting within
ends of the bars 35, 136 by bolts passed through a bore 311 formed in its head member 302. A
spring 318 is held within the hollow of the bar 70
70 spacer blocks 214. The bars 212 are thus actu
ated by the main feeding devices 26.
.
rel and is interposed between its end and a nut
The blank p is thus moved from station F an
319 threadedly engaged in the back end of the
its forward end is inserted in curved spaced bore 311. This spring transmits pressure on the
tracks or grooves 215 (Figs. 2 and 15) formed in ?nger leg and through it to the clamping pro
75 a pair of curved track bars 216 the upper ends jection 313.
76.
2,131,057 ;~
7
With the upper ?nger projections 3 ! 3 thus held
tightly against the notched ends of the lower ?n
provided with feet 339 which extend up through
gers, both head members are moved toward each
other the blank a at such time resting in its cen
tralized position over the inclined die 29!. The
ring. The top of the feet engage the interior,
top wall of the punch and bolts 34! secure punch
inner cooperating corners of the ?ngers 30!, 308
are beveled and as the head members move from
the spaces 335 between the spider arms of the
and anvil together as a unit. The lower face of
anvil 338 is suitably embossed at 342 with the par
ticular design of the can end to be drawn and is
a counterpart of a panel con?guration 343
formed in the top of the stationary anvil'328.
the position of Fig. 19 into that of Fig. 20 the
outer edges b of the blank pass into the lower
10 ?nger notches 30'! and slightly rocking the upper
The descending punch parts forcing the draw
?ngers on their pivots move under the projections ‘ ring 326 down'as has just been described tem
3!3. The blank is thus clamped simultaneously porarily hold the disc 10 between the lower face
in four places, two on each side of the die.
of the enlarged section 332 of the punch ring 33!
The punch and die mechanism at station G is and the upper face of the stationary anvil 328.
15 of suitable construction for making the desired This holding action is in the nature of a slip grip
can end‘. A punch 32! is illustrated (Figs. 15 for the blank which allows for the embossing and
and 16) as having a hub 322 which may be con
drawing action of the panel parts 342, 343 of the
nected to the reciprocating press slide as is usual anvil members 338, 328. The movable anvil 338
in press construction. The punch is formed with at the end of its descent bottoms into a depres
20 a cutting edge 324 which cooperates with the die sion 344 formed in the upper part of the station
cut edge 295 as the punch descends upon the ary anvil.
'
blank to cut out a circular disc from the center
At the same time the outer peripheral edge of
part of the held blank. 'I"nis constitutes an initial the disc is bent or drawn over the upper and outer
step in a blanking and can end forming opera
corners of the stationary anvil as the edge slips
25 tion. The scrap pieces remaining after removal out from between the punch 32! and the draw
of the disc (designated by the letter T, Fig. 18)
ring 326. This provides an outer or started curl
are still held on top- of the die by the clamping ?ange s for the formed can end t as illustrated
?ngers (Fig. 20).
in Fig. 17. The stationary anvil 328 is also pro
In the further step of can end forming the cut
vided with a transverse groove 345 (Fig. 16) in
30 out disc is pushed down by the descending punch which the lock joint n is seated.
32! against a draw ring 326 (Fig. 16) . This draw
Following the can end forming operation and
ring may be suitably supported on vertically dis
as the punch 32! and parts carried thereby move
posed pins 32'! which slide in bores formed in the up and away from the lowerdie member the
press frame 292. This is a usual die construc
drawn can end i sticks inside of the punch until
‘iion, the support pins 32'? being yieldingly sup
it is ejected by movement between the punch ring
ported in suitable manner.
.
33! and the punch 32!. The independent actua
The draw ring is depressed by the descending tion of punch and punch ring referred to above
punch and together the disc and ring move down
which is a usual form of operation in die mecha
and- the disc comes into engagement with the top nism, permits this knock-out movement of the
of a stationary anvil 328 located inside of the die
punch ring. The ejected cover thereupon falls
29!. Anvil 328 is supported on the press frame into a chute 35! (Fig. 15) which is secured to the
292. A punch ring 33! is slidably mounted inside press apparatus and is located adjacent the punch
of the punch being carried on an independently - and die parts.
movable part as more fully explained in the fol
When the can end t has been thus ejected the
scrap pieces 1', still held in the clamping ?ngers
45 lowing paragraph, and by the time the disc
strikes the top of the anvil 328, it has moved 30!, 308, are ejected in the following manner.
down relative to the punch being actuated by its These scrap pieces are no longer joined together
independently movable mounting, that is in ad
for during the cutting of the. disc from the com
dition to its descent with the punch, so that its
posite blank 1) in the initial step of the blanking
and can end forming operation already fully de
50 lower surface engages the disc directly above its
supporting anvil contact.
scribed, the lock joint which held the two parts
The punch ring 33! is enlarged at its lower end of the blank together was entirely cut-out with
332 and the outside wall of this enlarged part the disc, leaving the scrap pieces r merely abut
slides within a cylindrical wall 333 and its upper
ting as held adjacent to each other by the clamp
55 part is similarly mounted to slide inside a second ing ?ngers.
cylindrical wall 330 both walls being formed in
Accordingly when these ?ngers move up, this
the punch. The upper part of the punch ring being effected by lifting of the levers 303 and their
is formed as a spider with spaces 335 between
supporting rock shafts 304, into the. position of
its arms and with a center boss 336. The punch Fig. 21 following the end forming operation and
thence out or away from each other as in Fig‘. 22,
60 ring is supported on and actuated by a vertical
shaft 33'! which is slidably mounted in the hub the two pieces are brought into a position which
322 of the punch 32! and its lower end is thread
is outside of the die elements. Each scrap‘piece
edly engaged in the ring boss 336.
‘
is then positively ejected from the clamping ?n
This is common die practice and independently . gers 30!, 308 by a device best illustrated in Figs.
16 and 22.
movable punches and punch rings must neces
sarily be used where there is a multiple action of
Each lower ?nger 30! is formed with a hori
the die parts. The punch is usually actuated by zontal bore 353 and a spring pressed pin 354 is
a crank connection and the punch ring in such slidably located in this bore. Each pin 354 is nor
cases is usually controlled by a cam action so that
mally spring held with its inner end back of the
70 the punch and punch ring can be made to work slot 30'! of the ?nger. A collar 355 is formed on
together through a part of the operating stroke the pin and has sliding movement within an en
and then independently as in the present in
larged horizontal bore 356 also formed in the ?n
stance.
ger, and iconnectingat its forward end with the
A forming anvil 338 is disposed within the smaller bore 353. A spring 35'! is disposed be
ring 33! and is carried in the punch 32!. It is tween the forward end of the collar and the inner
10
15- 5
20:1
25.:
40. i_.
55.1".
05
75,
8 .
2,131,057 ‘I
wall of the enlarged bore 356 and this spring holds
rial blank sections through a series of operating
stations, means for interlocking said shaped
a threaded nut 358 which is secured in the. ?nger ' edges, bumping elements for pressing said inter
and which closes OK the rear end of the larger locked edges together to form a ?at composite
53-; bore.
blank, and can end forming instrumentalities for
the rear end of the collar back (Fig. 16) against
When the ?ngers 39!, 398 move back and sep
arate the scrap pieces (Fig. 22), the rear end of
each pin 354 strikes against a stationary part 359
which may be suitably supported on the press
10;~‘frame or otherwise and holds the pins against
further movement while the ?ngers still move
back. This strips off the skeleton pieces from the
clamping ?ngers which thereupon fall by gravity
into side discharge chutes 36! (Figs. 2 and 22)
which are disposed on the two sides of the punch
ing die mechanism.
It is thought that the invention and many of
its attendant advantages will be understood from
the foregoing description, and it will be appar
:ent that various changes may be made in, the
form, construction, and arrangement of parts of
the apparatus mentioned herein and in the steps
and their order of accomplishment of the process
described herein, without departing from the
gszgspirit and scope of the invention or sacri?cing all
of its material advantages, the apparatus and
process hereinbefore described being merely a
preferred embodiment thereof.
ing elements for permanently uniting said blank
sections into a single ?at composite blank, and
forming instrumentalities for forming a substan
tially ?at can end from said composite blank.
6. In an organized apparatus for making sub
stantially flat multi~part can ends the combina
tion of feeding devices for conveying two separate
?anged sheet material blank sections to an as
sembling station in edge to edge relation, ele-'
ments at said assembling station for uniting the 25'
marginal edges of said blank sections to provide
a single composite blank, transfer means for mov
ing said single blank into a can end forming sta
I claim:
tion, and instrumentalities at said forming station
1. The method of making multi-part substan
for forming a substantially ?at can end of single
tially ?at can ends which comprises preparing a
marginal edge of each of a plurality of sheet ma
terial blank sections for a bending operation,
thickness from said blank.
'
bending said marginal edges at an angle to the
‘surface of each blank section and in opposite di
'7. In an organized apparatus for making multi
part can ends the combination of feeding de
vices for conveying two separate sheet material
blank sections individually'through a series of
rections for interlocking engagement, bringing
substantially identical marginal edge preparing
said blank sections together, interlocking said
bent marginal edges, permanently uniting said
edges to form a single composite blank having
radial joints of four thicknesses of sheet metal
operations and into an assembling station, ele
ments at said assembling station for permanently
uniting the prepared edges of said blank sections
to form a single blank, transfer means for mov
ing said single blank away from said assembling
to strengthen the blank against bending, and cut
ting out and forming a can end from said blank.
2. The method of making multi-part can ends
instrumentalities associated with said transfer
which comprises simultaneously conveying two
?at sheet material blank sections along parallel
means and located at said latter station for form
ing a can end from said single blank.
paths, successively trimming and notching a mar
ginal edge of each, transversely conveying said
trimmed and notched sections toward each other,
further conveying the sections in unison along
‘oi-parallel paths, bending their notched marginal
edges into angular form, interlocking the same,
compressing said interlocked edges to unit the
blank sections into a single‘ composite substan
tially flat blank, conveying said composite blank
55 to can end forming instrumentalities, and then
cutting and forming a can end from said‘ com
35'
40
station and into a can end forming station, and
8. An organized apparatus for making multi 45
part can ends comprising feeding devices for si
multaneously conveying a pair of sheet material
blank sections in parallel paths and with a step by
step movement through a series of operating sta
tions, means associated with one of said stations 50
for simultaneously aligning said blank sections
and for trimming their opposed marginal edges,
die means associated with another of said sta
tions for simultaneously notching the trimmed
edges of said blank sections, edging means associ
posite blank.
ated with one of said stations for angularly bend
3. The method of making multi-part can ends
by a continuously operating coordinated mecha
ing said trimmed and notched edges in opposite
directions for interlocking engagement, means at
another of said stations for interlocking said
edges, elements also at said last mentioned sta 60
tion for permanently locking said interlocked
edges and uniting the blank sections into a single
blank, transfer means for further advancing said
blank, and can end forming instrumentalities for
nism, which comprises conveying two separate
?at sheet material blank sections and passing
them individually through a series of separate
substantially identical operations in which a mar
ginal edge of each blank section is prepared for
65
producing a substantially ?at can end from said
blank.
5. An organized apparatus for making substan
tially flat multi-part can ends comprising edging
means for forming oppositely disposed hooks on 10
a marginal edge of each of two ?at sheet mate
rial blank sections, means for arranging said
blank sections with said hooked marginal edges
opposite each other in edge to edge relation,
means for interlocking said hooked edges, bump
interlocking engagement, assembling and perma
nently uniting the prepared marginal edges of
said sections into a single substantially flat blank,
conveying said united blank to can end forming
instrumentalities, and cutting out and forming a
substantially flat can end from said blank.
4. An organized apparatus for making substan
tially ?at multi-part can ends comprising means
for shaping a marginal edge of each of two sheet
material blank sections for interlocking engage
75 ?Tment, feeding devices for conveying sheet mate
forming a can end from said blank.
9. In an organized apparatus for making multi
part can ends the combination of edging means
for forming oppositely disposed hooks on a mar
ginal edge of each of two sheet material blank 70
sections, means for arranging said blank sections
with said hooked marginal edges opposite each
other at an assembling station, lifting devices at
said assembling station for vertically elevating
said blank sections one above the other, cross
2,131,057"
slides associated with said. lifting devices for
transversely moving said blank sections one be
neath the other in lapped position and for inter
locking said hooked edges, gauging means coop
erating with said cross-slides for properly locat
ing said interlocked edges, bumping elements as
sociated with said assembling station for uniting
said interlocked edges and for permanently join
ing said blank sections into a single blank, trans
10 fer means for moving said blank away from said
assembling station, and instrumentalities associ
ated with said transfer means for forming a can
end from said blank.
10. In an organized apparatus for making
15 multi-part can ends the combination of feeding
devices for conveying two separate sheet material
blank sections having hook ?anges to an assem
bling station, elements at said assembling sta
tion for uniting marginal edges of said blank sec
20 tions to join them into a single blank, transfer
means for moving said blank away from said
assembling station and into a forming station,
guiding means for aligning said blank at said
forming station, can end forming instrumentali
25 ties also at said forming station for cutting out
and forming a can end from said blank, clamping
means for holding said blank in cutting and
forming position and after a formed can end is
cut and removed for then removing the remain
ing scrap skeleton, and ejecting means associ
ated with said clamping means for ejecting the
said scrap therefrom.
9
11. The method of making can ends which
comprises bringing together in edge to edge rela
tion a plurality of sheet material blank sections, -
interlocking adjacent marginal edges of said
blank sections to form a single ?at blank having 5
radial joints of more than two thicknesses of
sheet metal to strengthen the blank against bend
ing, and producing a can end of substantially
single thickness from said blank.
12. The method of making substantially ?at 10
multi-part can ends which comprises shaping a
marginal edge of each of a plurality of‘ ?at sheet
material blank sections for interlocking engage
ment along a substantially straight line,interlock
ing said shaped edges, conjoining said inter 15
locked shaped edges for uniting said blank sec
tions into a single flat blank having radial joints
of four thicknesses of sheet metal to strengthen,
the blank against bending, and forming a can end
of substantially single thickness from said blank. 20
13. An organized apparatus for making sub
stantially ?at multi-part can. ends comprising a
means for bringing together in edge to edge rela
tion two sheet material blank sections, means for
interlocking adjacent marginal edges of .said 25
blank sections to form a single substantially flat
blank’ having radial joints of four thicknesses of
sheet metal to strengthen the blank against
bending, and forming instrumentalities including
bumping means for producing a can end from 30
said ?at composite blank.
7
JOHN L. LEWIS.
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