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Патент USA US2405198

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Aug“ 6, 1946.,
Filed May 26, 1945
5 Sheets-Sheet 2
M‘ (Mud/44¢
Aug. 6, 1946.
Filed May 26, 1945
5 Sheets-Sheet 3
Aug, 6,1946.
w. ‘B. EWENG
Filed May 26, 1943
5 Sheeté-Sheet 4
Aug: %, mm,
W. B. Ewms
Filed May 26, 1945
‘5 Sheets-Sheet 5
-. Y
0y ‘
' _
WALKLEY azwme >
BY .
Patented Aug. 6, 1946
Walkley B. Ewing, Frankfort, Mich., assignor to
Ewing Development Company, Bay City, Mich.,
a corporation of Michigan
Application May 26, 1943, Serial No. 488,612
5 Claims.
(01. 164-625)
This invention relates generally to means for
controlling’ the advancement of stock and refers
Figure 6 is an edge elevation of the spacer
illustrated in Figure 5;
Figure '7 is a horizontal sectional view through
more particularly to means for controlling the
_the upright beam and bearings for the eccentric
advancement of sheet material through a ma
chine having cooperating punch and die assem 5 shafts for actuating the same;
Figure 8 is a fragmentary elevational view of
blies for transforming the sheet material into
sun screens. a
One of the essential objects of the invention
is to provide a machine wherein means is pro
vided for controlling the advancement of the
the upright beam and bearing sleeves illustrated
in Figure '7 ;
Figure 9 is an end view of the structure illus
trated in Figure 8;
Figure 10 is an elevational view of the drive
means and support therefor;
Figure 11 is an end elevation of the structure
illustrated in Figure 10;
in two means, preferably arranged in tandem,
is provided for successively stopping or limiting 15 Figure 12 is a horizontal sectional view taken
substantially on line I2-I2 of Figure 11 and
the advancement of the sheet material.
shown partly in dotted lines to disclose the bed
Another object is to provide a machine where;
in both means just mentioned are carried by but
Figure 13 is an enlarged front elevation of a
are movable relative to a reciprocating punch
20 vsmal1 portion of a preferred form of sun screen
assembly of the machine.
made by the machine;
Another object is to provide a machine where
Figure 14 is a cross sectional view taken on
in both means operate in timed relation to each
the line I4——M of Figure 13;
‘other and to the punch assembly during recipro
Figure 15 is an enlarged plan view of a por
cation thereof.
Another object is to provide a machine where 25 tion of a slitted blank used in making the sun
screen illustrated in Figures 13 and 14; and
in the means for controlling the advancement
Figure 16 is a ‘perspective view of the blank
of stock is simple in construction, easy to install
of Figure 15 partially folded into the screen
and e?icient in operation.
structure illustrated in Figures 13 and 14.
Other objects, advantages and novel details
The sun screen produced by a machine em
of construction of this invention will {be made.
bodying my invention is formed ‘by slitting and
more apparent as this description proceeds, es
folding a single sheet of material and consists of
pecially .when considered in connection with the
a series of parallel strips 2 of elongated cross
accompanying drawings, wherein:
section which are vertically superposed at equal
Figure 1 is a perspective view of the main
intervals not greatly exceeding, and preferably
frame of the machine, with a schematic assembly 35 approximately equal to, the width of a strip,
of the drive shaft, two eccentric shafts and con
and are inclined, preferably at least 45°, and per
nectors upon the supports therefor carried by
haps as much as 75°, to the general plane of
stock so that it may advance in fast, short
strokes through the machine.
Another object is to provide a machine where
said frame;
the screen, i. e. to the Vertical.
Figure 2 is a vertical sectional view through 40 As shown, each individual strip 2 extends
the machine at the center line thereof, with
horizontally across the screen and lies in a single
parts in elevation;
Figure 3 is a vertical sectional View through
plane. Preferably each strip 2 is offset regularly
in the same direction at equal intervals along
the slitter and folder punch and die assemblies;
its length, as at ‘3, the distance of offset not ex
Figure 4 is an enlarged fragmentary vertical 45 ceeding about three-fourths the width of the
sectional view through the slitter punch assembly
and cooperating die assembly when the punch
assembly is in fully raised position, with the
stripper bar in raised position to permit ad
vancement of the sheet material, and the spring
pressed insert in lowered position to limit such
strip, and being advantageously about one-half
such width. The strips 2 are joined together by
vertical rows of legs ‘4 formed of sheet material
integral with that of the strips, each leg having
a width substantially equal to the regular offset
distance of each strip, i. e. not greater than
advancement, and showing by dotted lines the
about three-fourths the width of a strip, and
further, advancement of the sheet material;
connecting a front portion 5 of a strip with the
corresponding oppositely offset rear edge 6 of an
Figure 5 is a detail elevational View of one
55 adjacent strip. The rows of legs 4 are ordinarily
of the spacers in the slitter punch assembly;
2,405, 198
spaced apart a distance large in comparison to
The displacement of the strip members 2 and
the concurrent formation of the legs 4, may be
the intervals between adjacent strips. As will
be seen from the drawings, the legs 4, are in
clined to the general plane of the screen, and
are also rather sharply inclined to the strips to
which they are attached. The legs in any given
rendered more accurate by de?ning on the blank
fold lines 9 to mark the point of juncture of the
vertical planes, and preferably have their centers
leg members 4 with the strips 2, either by suit
ably crimping the blank or by other means. The
fold lines 9 are ordinarily oblique to the long
edges of the strips 2 and are preferably in the
all in the same vertical line, in order to give a
same or parallel planes.
generally rectangular appearance to the screen.
The angle at which the strips 2 are inclined
to the general plane of the screen is controlled
by three factors, i. e. the angle of the fold lines,
row are ordinarily in the same or in parallel
While the sun screen is illustrated with only
two oifsets per strip and two rows of legs, it will
be appreciated that it may comprise any number
of offsets and corresponding rows of legs, to :form
a screen of the desired dimensions. ‘In general,
the width of a strip will be from one-eighth to
one-half inch, and the distance between rows of
legs one-half to ?ve inches, although other sizes
are equally possible. The screen is usual-lyfabr-i
cated of thin sheet metal, but may also be formed
of other ?exible, strong materials, such as syn
thetic plastic sheet.
For ‘the purpose of de?nition, the sun screen
may also be considered as comprising .a plurality
of parallel vertically superposed horizon-tally ex
tending series of strip elements, :the individual
elements of each horizontal series being inclined
to the general plane of the screen and to the hori
zontal ‘and being interconnected in offset rela
tion, and leg members connecting the ‘strip vvele
ments of each horizontal series with the (corre
the bias angle '1, and the degree of fold imparted
to the leg members 4. In making the screen,
these angles and the various dimensions of the
strips 2 and leg members 4 are chosen so that,
in the final screen, the strips 2 have an inclina
tion capable of providing the desired protection
from direct sunlight. The precise choice of these
angles and dimensions is made from mathemati
cal formulas which have been developed from
the geometry of the screen and theblank.
The :screen may be fabricated by extremely
simple means from a single sheet of material,
and can be made in any desired size. The metal
in the screen is not under stress, having been
merely folded into position. The structure pre
sents only smooth, flat surfaces, and hence 7col
lects little dust or dirt, and can be'easily cleaned.
30 If desired, it may be rolled up for shipping,
Referring now to the machine for making the
sponding elements of
adjacent horizontal
series. In this concept, the individual elements
sun screen, A is the main frame having a base
of each horizontal series of strip ‘elements are
preferably interconnected by ‘offset members .in
ends ‘of the base, and a top l3 mounted upon the
uprights. B is .an auxiliary ‘frame mounted
such manner that the ‘said elements and said
offset members together constitute a single inte
gral strip lying in one plane.
and constituting a support for a die assembly C
H1, uprights H and 1.2 respectively at opposite
Within the main frame A .at the bottom thereof
and feed bed D; .and T4 vis a horizontally disposed
T-be‘am extending between and terminally se
_, in making the sun screen of the invention, the
sheet material or blank from which the screen is
cured to the uprights I I and I2 of the mainframe
in upwardlyand rearwardly-olfset relation to the
to be fabricated is ?rst preferably slit and is
then formed into the screen. Preferably this
auxiliary 'frameiB.
blank comprises a sheet substantially r-homboidal
{5, It‘ and i7 respectively are ‘parallel horizon
tal shafts disposed obliquely ‘to ‘the ‘longitudinal
.in shape and having therein on the bias :to an
edge thereofa plurality of like parallel series '‘
median line of the main frame and supported
from the ‘top l3 thereof and adapted to ‘be driven
of parallel regularly offset overlapping slits, said
slitted sheet thus defining a plurality ‘of ‘parallel
continuous regularly offset strip members inter
connected at their corresponding ‘oppositely off
.set portions by leg members.
‘As shown in Figure ~1l5=the parallel slits are all
from a motor (not shown‘) or other suitable power
plant upon "the top ['3 of ‘the _frame. Preferably
the shafts IS, IS and I‘! respectively are mounted
5) in ‘suitable bearings withinsleeves 2i suspended
‘by a bracket 22 ‘from ya plate 23 rigidly secured
‘to the underside of the top I3 ‘of the frame.
disposed at a bias angle 1, determined as herein
after explained, and are arranged in "a plurality
In ‘the present vinstance the ‘shaft {5 is‘ a rotat
of like parallel series, as at ‘8 ‘and 8'. The in
ing shaft, while the ‘shafts l6 and 1'! respectively
dividual lines within a series are regularly offset ~91: merely-oscillate and are ‘driven in unison from the
a distance which does not exceed about three
shaft [5. As shown, a double ‘crank arm '24 ‘is
fourths the ‘distance between corresponding .lines
of adjacent series, ‘and overlap at their offset
positions a distance which does not greatly ex
ceed, and need not equal, the distance between 651
corresponding lines of adjacent series. -As a re
sult of this slitting,*there are formed parallel
continuous regularly offset strip members 2 in
terconnected at their corresponding oppositely
offset portions by leg members 4.
The blank ‘slitted as ‘described is formed into
a ‘sun screen by successively displacing each strip
member diagonally downward and backward in
the bias direction to force ‘the strips into sub
stantially parallel planes and to vcause the leg
members to become inclined to the-strips and to
the. general plane of the resulting screen. A par
tially folded blank showing two of the strip
members already displaced into position is :i-llus
tra-ted'in Figure 16,
carried by the shaft [1 and is connected by rods
25 and 26 respectively to cranks 2’! and 28 re
spectively carried by the shafts l5 and ‘it. Thus,
rotary movement of the shaft [5 will be trans—
lated by ‘the crank 21, red 25 and crank 24 into
oscillating movement for the shaft 17, and such
oscillating movement of shaft I‘! will be ‘trans
mitted by the rod 3256 and crank 2-8 to the shaft I 6
so that both shafts t6 and H ‘will oscillate in
‘Preferably the shafts l6 and 117 have eccentric
portions ‘29 and 30 respectively carrying ‘bearings
for tubular sleeves 3-! and 32 respectively from
which a ‘vertical V'Lbeam 33 is suspended in sub
starrtially vertical alignment with the auxiliary
frame 13 for actuating simultaneously a s'litter
punch assembly ‘E and a folder punchassemblyfF
relative to athedie assembly C.
The punch rassembly E redipro‘cates ‘vertically
relative to the die assembly C to provide slits such
as 8, 8’ in the sheet material, while the folder
’ punch assembly F oscillates relative. to the-die
assembly C to fold portions of the sheet material
beside the slits into louvers and interconnecting
legs such as 2 and 4 respectively.
The folder punch assembly F is beside but sepa
rate from the punch assembly E and is secured
to a depending leg or ?ange 34 of the I-beam 33
so as to oscillate in unison therewith as such
of the holder 82 are held in assembled relation
therein by means of a clamping wedge 81 that
is bolted or ‘otherwise suitably connected to the
holder. As shown, the blades 83 to 85 inclusive
are arranged in overlapping inwardly inclined
relation with the lower working ends thereof in
downwardly stepped relation for mating engage
ment with the top and‘ undercut portions 61‘ and
68 of the die blocks 65.
In the present instance, the sheet material X
beam isv actuated by the eccentrics 29 and 38 of
is fed from a power driven roll thereof (not ‘
the shafts I6 and IT. ‘A yoke 35 straddles the
shown) onto and along the feed bed D beneath
punch assembly E and the base 36 of the Iebeam
the T-beam' I4 to the slitter punch and die as
33 and cooperates with said base for translating
semblies E and H respectively which collectively
the oscillating movement of the I-beam into a 15 constitute the ?rst station where the slits 8, 8'
vertical reciprocating movement for the punch
are successively formed. Such material X is then
assembly E. In this connection it will be noted
advanced to the: folder punch and die assemblies
that the yoke 35 is guided vertically-by the head
F and J which collectively constitute Ithe second
of the T-beam I4 carried by the main frame and
station where portions of the material beside the
that the punch assembly E is guided vertically by 20 slits are folded into inclined relation to the sheet
means of pins 31 mounted upon the auxiliary
material to form the louvers 2 and legs 4 of the
frame B.
sun screen.
The die assembly C has a base 48 mounted
A strip-per bar- 98 is movable vertically within
upon the auxiliary frame B beneath the feed bed
a suitable recess 9| in the lower end of the clamp
D and includes a slitter die H and a folder die J. 25 ing section 12 of the holder ‘I8 for engagement
Preferably the slitter die H is clamped between
with the sheet material X to partially control the
sections 4| and 4|’ of a suitable holder M on the
advancement thereof to the two stations men
base 48 at the inner end of the feed bed D, while.
tioned. As shown, this stripper bar 98 is con
the folder die J is anchored upon the outer
nected to the lower end of a vertical bolt 92
section 4|’ of the holder for the slitter die H. 30 slidablly mounted in the clamping section ‘I2 and
Any suitable means such as a clamp 42 and bolts
having the head 93 thereof within a recess 94 l
43 and 44 respectively may be employed to fasten
in said clampingsection. A coil spring 95 is
the holder sections 4|, 4|’ to the base 48.
sleeved upon the bolt 92 within an enlarged re
The slitter die H has plate-like blades 58 and
cess 96 in the clamping section ‘I2 and in a similar
plate-like spacers 5| beside said blades. The up
recess 91 in the stripper bar 98 and urges the
per ends 62 of the spacers 5| are'?at and are
latter downwardly upon the sheet material X to
preferably arranged in stepped relation to each
other and to the upper ends of the slitter
blades 58.
hold it against such advancement. However,
when the head 93 of bolt 92 engages the, bottom
of the recess 94 in the clamping section 12 dur
The folder die J comprises a series of block-like 40 ing the upward movement of the punch holder
members 65 which are anchored by bolts 66 upon
18, the stripper bar 98 will be raised to permit
the outer sections 4|’ of the die holders M in
advancement of the sheet material from the first
stepped relation to the spacers 5|, and are pro
station to the second station. Cooperating with
vided at their outer edges with stepped undercut
the stripper bar 98 is an insert I88 slidably
portions 61 and 68 respectively.
mounted within the spacer 15 and normally
The punch assembly E includes a holder 18
urged downwardly by a coil spring |8I in said
having a head 1| between the base 36 of the I
spacer into the path of the advancing sheet ma
beam 33 and the lower arm 35’ of the yoke 35,
terial X to limit the advance thereof after it .
and clamping sections 12 and 13 respectively
has passed the ?rst station.
which are carried by the head 1| within a recess 50
During the initial upward movement of the
‘I4 in the lower forward corner thereof. The
holder ‘I8, the stripper bar 98 will be held down
slitter blades 59 of the punch assembly are dis
posed in upright staggered overlapping parallel
by the spring 95 in engagement with the sheet
material X to prevent it from advancing until the
insert; I88 in spacer 15 reaches its fully projected
relation to each other between plate-like spacers
‘I5 and 16. Any suitable means such as bolts 11
downward position. Thus, clearance is provided
and ‘I8 may be used to hold together the clamp
between the insert I88 and the spacers 5| to
ing sections 12 and ‘I3, and any suitable means
permit advancement of the sheet material but
such as the bolts ‘I9, 88 and 8| respectively may
such advancement is still prevented by the strip
be used to fasten the clamped sections 12 and
per bar 98. During final upward movement of
13 to the head '|I.
60 the punch holder ‘I8 the stripper bar 98 is raised
When assembled between the sections 12 and
as aforesaid out of contact with the sheet mate
13, the lower working ends of the slitter blades
rial to permit its advancement. The sheet ma
58 project slightly below the lower ends of the
terial will then be advanced until the forwar
spacers 16 so as to overlap in scissor-like forma
edge of the sheet abuts the insert I88.
tion the cutting edges of the slitter blades 58 on 65
Upon the initial downward stroke of the holder
the downward stroke of the punch holder ‘I8 to
‘I8 the stripper bar 98 will move downwardly to
effect the slitting operation. The lower ends of
again engage and hold the sheet material against
the spacers 15 and clamping sections 13 are sub
advancement. Upon the ?nal downward stroke
stantially ?ush with each other and are disposed
of the holder 18 the insert I88 will engage and
in lowered stepped relation to the lower working 70 be pressed upwardly into the spacer 15 by the
ends of the blades 58.
upper end of the lowermost spacer 5|. Thus, the
The folder punch assembly F comprises a die
sheet material is alternately held and released
holder 82 rigid with the depending ?ange 34 of
for advancement during reciprocation of the
‘the I-beam 33, and folder blades 83, 84 and 85
holder 18.
respectively within a recess 86 in the lower end 75 , In use, the shafts I6 and I‘! are oscillatedin
‘Thus, the sheet zmaterial :will be ; successively
.zadvanced a idistancefequalitozthe width o‘fa de
:ur'iison whenxlther shaft :i5 is .>rrotated,.:hence the
flebeamc33 tcarriedcby :the eccentric portions 129
eandr 3 O‘zrespectively :ohsaidsshaftsiis‘: likewise nscil
"pressewportion > each time? the punch 'assem‘blyE
.is'ifullyzraised ‘during vertical reciprocationthere
:During Ithe .zdownward :swinging. .tmovement :of
thezbeam 33-.‘thelfd1iierfpu1‘i6h assembly Fcarried
”.terial‘ willlha'ver advanced further > until ‘#the: ?rst
' mentioned depressedportion 'ofithe material, i.- e.
J to e?ect a folding operationgandtheipunch
time baseét'ii dflthe1beam'zto’cooperatewith the
l‘fdie fassein'bly H ltb'ié?éfct 1a ‘slitting foperation.
.10 ‘the portion between :the forwardle'n'd of the ma
:. terial "land the ?rst ‘slit, ' is . positioned? betweenv the
‘working portions ‘EL-'68, 83, 184 and 85 respective
li'hus-laxslittingaoperation and aifoldingroperation
‘zareizperiormed;simultaneouslyiduring ‘the down
‘wardeswingingimovementfofz theibeam 33.
lyiof-lthepunch and die assemblies Fi’andl-J.
'When‘ a seventhislit is being formediin‘ the sheet
material 'the- punch land die ‘elements-187,468, 83,
T84 and '85 respectively‘of the assemblies illtand J
‘will ‘fold :the ?rstimentioned depressed portion ‘of
lithe material {downward and backward ‘to provide
:During zthe: upward “movement 'rofethe beam. 3
athe :folder fpunc'htassemblyaFiwill be'moved inian
riarc upwardly and ‘:forwar‘dlylsaway ifrom the» die
wals'senibly iLianid‘the ‘punch-assembly B will ‘be
‘an inclined louver‘ 2 ‘and leg '4. " Thereafter, dur
viticallly ‘ upward away i from :the : die assembly H.
ing each'downwardstroke' of the beam'33; alfold
ingtoperation'to produce'a louver 2 and leg 4 ‘oc
Consequently the punch assemblies Exandf'F‘will
:be ~raised;simultaneously. fLIn-fact, ‘reciprocating
curs simultaneously with a slitting operationias
:the v‘sheet material is .advanced as aforesaid
- movement‘ is itranslated to the slitter punch “as
through'the machine.
'1 sembly~Etfroniithe oscillating beam 33‘whileioscil
‘When’ a’ ‘slit is formed in the sheet material,’ the
latingfmovement is imparted. directlyLto theii‘old
cutting edges ‘of the blades-50 and’SB forming~ the
» er punch.‘ ‘assembly
by said‘ beam.
slit "have “a'scissor-like action which causes a
The sheet material to The formed into lsun
screens 5 is iied ‘ onto and ‘I along " the feed :bed vD
tunder the ‘ T-"beam ' t4 lto ‘the"s'tripper ' bar ‘90.
' When‘ therpun‘ch assembly‘E isi?rstlfully-‘raised
ebytheyoke ?35:and beam "33 "as aforesaid, the
-sheetlmaterialswill:be?advancediuntil the forward
'I‘Elid‘ilJhEI'EOf?blillS the adjacent ‘side of the spring
:nprojected insert lll?'iwhich'will ‘serve as a'tem
:rporaryi'stopithereforgas illustrated in‘ Figure 4.
"Upen the f ?rst i‘downwardi stroke of ‘the punch
louver!‘ to‘ be slightly-preformed by a slight’dis
placement 'of'lthe‘ material beside said‘slit. Inas
much as'the beveled portions-'53 and BBIrespec
tively of the blades are opposed to one another in
advance 'of ‘the cutting edges of ‘said'blades when
the latter "are inioperative working position, it
will be 'apparent‘that ‘a leg-4 is falso'sli'g'htly pre
formed during this ‘slitting operation. In this
connection it will beappreciated that the‘bla'des
"5!! vand 581have corresponding portions53 and'li?
i'assenibly'Eirelative to the'die assemblyfH, the co
frespectivelyat opposite upright edges thereof and
eopera'ting icuttin'g wedges of a the blades 3-50 and 5S
'rwill‘overlap‘one another‘- toiform aslit in the sheet ~
have cutting edges at opposite sides thereof, hence
such'blades maybe readily reversed whenever-‘de
?sired‘to'provide double life thereto. It will also be
l‘material, consequently the blade 5B ' will *depress
sheet material bylthe'bladesfii? and'58, ‘the ma
'therebynwillibe moved; inzl'anlzarcr down land? back
:relative .:to‘ ‘the recuperating zfolder Ldie assembly
.i'assembly?iwillrbesmoved iverticallyidownwaxd by
After a sixth slit is: formed as 'aioresaid'iin'the
L‘be‘lowtheiupper end ofithe vblade 58 the portion
appreciated Tthat ‘the ‘spring pressed insert ' I00
o‘f'ithefmateriali-between ‘the forward ie'n‘dl thereof
‘and the stripper bar‘ 90'cooperate‘with each other
ran'dT-the slit so'iformed. During‘ithis operation‘the
i's'tripper bar"9? is held lbyiithe spring 95 Tin'?rm
R3, L.l
a-engagement‘with the sheet material to tempo
~rarily prevent :riurther advancement thereof on
time feedbed.
When the punch-assembly E ‘is again fully
:raised, the sheet material will be advanced, until
'thezrear edge 10f theiformedslit aforesaid abuts
‘in 'suchfa' way that the 'sheet'rmaterial may be: ad
vanced rapidly and accurately through ‘the ‘ma
What I claim as my‘invention is:
‘ 1.v 'A‘machine having'a stationary‘ die assembly,
‘a; punch assembly movable relative to the die as
"the adjacentsi‘de Iof lthe Tspring 1 projected" insert
f'sembly toitransform sheet material'into ar-prede
“t'ermined‘con?guratiomfand means carried by and
movable'relative to‘sthepun'ch assembly ‘for alter
#1 00;:and such advancement of ‘ the material will
inat'elyl permitting!aniiiche'cking the - advancement
1‘causeithe:depressedfportion thereof;- i. e.v the por
"of: sheettmaterial 7' relative to the‘ die ‘assembly.
2.‘ 'A‘ machine vhaving a stationary die assembly,
and a punch assembly movable relative to’ the "die
‘tionhetween the 'forward end *ofitheisheet and" the ‘
rforwardiedge of "thefformed vslit, l'toF be advanced
rabeneaththerprojected insert? mil.
During the nextidown‘war‘d strokel'of ‘the punch
' assemblytotransform ‘sheet materialfinto a pre
determined fcon?guration andzincluding ‘means
zassemblyYE‘ relative'tof the die iassembly H, < a ‘sec
operable automatically when the punch assembly
f‘on'dj'slit will: vhe formed as lafores‘aicl?byf'itheE blades l
is in a predetermined position relative toithe die
assembly for checkingihe advancement: of .. ‘sheet
~50rand ‘58 in'the :sheet materiatinistaggered vover
lapping iparallel relation to the i ?rst I‘mentioned
“slit; and :the ‘portion: ‘of "the? material’ between‘ithe
:material‘ relative to the'die assembly.
‘:3. A"ma'chineiffor slitting sheets comprising a
~-table1-over which the :sheet is ‘advanced .under
?rst and second zslitsfrrwilla'ber depresse‘di'bélowithe
'- continuousfforwards pressure, ‘a die ‘member ‘hav
rear edge or thezsecond'f'ormeds'slit.
When the : punch iassemibly 1E :is :again :runv
ing ‘ a :series f‘of 'tshea'ringi edge "with "overlapping
iportions arranged in‘the‘plane voi.’ thetable-and
“raised, the: sheet materialuwill ib'e vxa'dvanced until
a- depressed :step "beyondl'the same, :a-rpunch pro
‘vided ‘with a ‘cooperating ‘:shearing edge and
“adapted to press the sheared portion againstlsaid
step without any stretching or: the metal,r=a stop
'the' rear ‘edge’ of theisecondirfbrmedi slit abuts’ the
F adjacentside ‘50f ‘ the: spring .prdjectedi insert ‘ [B0,
:iand'rsuch advancement ‘of the:materiahvillt'cause' l
r-the :?rst mentioned "depressediiportion oi" thema
"carried :byv ssai'd 'punchzspace'd. .in ' 'advanceléof 1i the
iterial ‘to I be: advanced over ?' the‘ .‘foldertdie J, and
"will ‘cause " the \"second tmentioned depressed por
.‘shearing ledgetthereofl equal ito ‘the 'width 'of; said
(step, :sa'id stoprinzzthe rrétracted .positionzo'f said
tion to be advanced beneath the projectediin'sert
jrpunch'rextendin‘gY'into:the path'oftthe :portionzof
said sheet on the table but clearing the depressed
sheared portion thereof whereby said sheet will
be successively advanced step by step.
4. A machine for slitting sheets comprising a
table over which the sheet is advanced under con
tinuous forward pressure, a die member having
a series of spaced overlapping shearing edges and
a depressed step beyond each of said edges, a
punch provided with a corresponding series of
cooperating shearing edges, a plurality of stops 10
carried by said punch spaced in advance of shear-v1v
ing edges thereof, said stops in the downward;~
movement of the punch depressing the shearedi
portions against said step, bending the portions
between overlapping shearing edges without 15
stretching the metal and in the retracted posi
tion of said punch extending into the path of
tinuous forward pressure, a die member formed
of a series of overlapping spaced shearing blades
with the cutting edges thereof in the plane of
the table and with depressed steps beyond each
cutting edge, a punch formed of a corresponding
series of overlapping spaced shearing blades for
cooperating with the blades of the die member,
and a plurality of resiliently yieldable stops car
ried by said punch spaced in advance of the cor
responding blades and in the raised position
thereof extending below the same to be in the
path of the portion of the sheet lying on the table
while clearing the depressed sheared portions
thereof said steps in the downward movement
of the punch depressing the sheared portions
‘against said steps without stretching the metal,
and a stripper carried by said punch for holding
said sheet to the table during the withdrawal of
clearing the depressed sheared portions thereof
the punch from the die member but releasing said
to permit advancement of said sheet step by step 20 sheet in the fully retracted position of the punch
succeeding each shearing operation.
whereby said sheet will be successively advanced
5. A machine for slitting sheets comprising a
step by step following each punching operation.
table over which the sheet is advanced under con
the portion of said sheet lying on the table but
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