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Патент USA US3034793

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May 15, 1962
1_, l.. cHRlsTA
3,034,783
PREss PEEDING METHOD AND APPARATUS
Filed Aug. 26, 1960
7 Sheets-Sheet 1
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May 15, 1962
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PRESS FEEDING METHOD AND APPARATUS
Filed Aug. 26, 1960
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PRESS FEEDING METHOD AND APPARATUS
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INVENToR.
¿E0/YARD LEO/V (19E/.57A
BMP _Q
Unite States
3,il34,783
Patented May 15, 1962
2
3,034,783
PRESS FEEDING METHÜD AND APPARATUS
Lepnard Leon Christa, San Jose, Calif., assigner to Amer
lean Can Company, New York, NX., a corporation of
New Jersey
Filed Aug. 26, 19st), ser. No. 52,235
11 Claims. (ci. 271-14)
Since -the underlying strip is moving longitudinally rela
tive to the overlying strip, the length of overlap de
creases, but before it disappears entirely, the overlying
strip reaches its fully inserted position and is engaged
by the longitudinally reciprocating feed dogs and starts
its longitudinal motion into the dies. Thereafter both
-strips move together, the succeeding strip overlapping
the one ahead of it only slightly, the overlapped por
tions of each strip comprising portions of the scrap areas
into presses, and has particular reference to a method 10 which must necessarily be provided in each blank space
and apparatus for feeding scroll cut strips into strip feed
around the potential can end therein so that the cutting
The present invention relates to the feeding of strips
presses in such manner that there are no gaps between
the strips so that consequently the cutting dies of the
press never miss a cutting stroke.
dies are enabled to make a clean cut Without feather
edges. Consequently, the lapped portions of the strips,
which comprise double thicknesses of stock, are never
Until recently, the can making industry received all 15 actually cut by the dies, but become parts of the strip
of its supplies of tin plate from the steel mills in the form
skeletons.
of precut, straight edged, square or rectangular sheets,
In order to insure lthat the reciprocating feed dogs
the cutting and packaging of such sheets being done at
engage the underlapped, trailing edge of the leading
the steel mills. In the past few years, however, a con~
strip during the time the strips are being fed longitudi
siderable percentage of such supplies of tin plate has 20 nally along the feed table, the rear edge of the leading
lbeen received by the can manufacturer in the form of
coils many thousands of feet in length, the cutting of
such coils into sheets now being done by the can manu
facturer in his own plants. Considerable economies are
sheet is pressed downwardly by spring buttons in order
to space the overlapped portions of the strips apart t0
provide a space in which the feed dogs may operate.
In order to prevent interference between the strips and
made possible by this development, especially in the for 25 to prevent any burrs which might be present on the
mation of can ends and other circular articles, since the
edges of one of the strips from scratching the other
coils are now being cut by scroll edged dies into large
strip as the succeeding strip is inserted into the feed
sheets having two opposed >scroll cut edges, and these
table, means are provided to space the overlapping por
large sheets are then subdivided without waste into scroll
tions of the strip vertically from each other during the
strips each of which contains a double row of blank 30 time the succeeding strip is being inserted into the feed
spaces from which the can ends are subsequently cut,
table.
the blank Spaces in one row being longitudinally offset
As a result of these features the present invention suc
or staggered with respect to those in the other row a
cessfully fulfills its main objective of providing a prac
distance equal to one-half of a blank space.
tical method and apparatus for feeding strips to the dies
These scroll edge strips are then fed into a strip feed 35 of a strip feed press in such manner as to fully utilize
press in which a pair of staggered cutting dies cut them
the cutting efficiency of the press.
into can ends. When the scroll edged strips are fed
Another object of the present invention therefore is
into such dies, normal practice has been to provide a
the provision of an apparatus for feeding strips into a
gap equal to a full blank space between successive strips
press in slightly overlapped relationship so that the gaps
in order to provide room behind the strips for the feed 40 'between successive strips are eliminated and the dies of
fingers which feed them into the dies.
the press never “cut air.”
ì
Because of the necessities of practical die construction,
Another object is the provision in such an apparatus
the cutting dies are staggered from each other a distance
of means for positively holding the overlapped edges
equal to one and a half blank spaces.
As a result of
of successive strips apart so that the feed fingers are
the combination of this spacing between the dies and
enabled to engage the trailing edge of the leading strip
the gaps between successive sheets, there are two strokes
and feed it into the press.
of the press for each strip in which one or the other of
Yet another object isv the provision of means for pre
the cutting dies comes down into the gap between the
venting scratching of the strips as the succeeding strip is
strips and “cuts air,” as such wasted, non-productive cut
fed laterally across the preceding strip and into posi
is termed in the industry.
50 tion on the feed table.
The present invention eliminates this cutting of air by
Numerous other objects and advantages of the inven
eliminating the gaps between successive strips as they are
tion will be apparent as it is better understood from
fed into the cutting dies.
theV following description, which, taken in connection
In the usual strip feed press, the strips are Stacked in
with the accompanying drawings, discloses a preferred
a magazine from which each strip is pulled individually 55 embodiment thereof.
by suction cups which lift it into the plane of the feed
Referring to the drawings:
table of the press. Thereafter, the suction cups are de
`FIGURE l is a side elevation of a press feeding mech~
vacuumized, and one of the long edges of the strip is
anisrrl embodying the principles of the instant inven
engaged by spaced inserter fingers which feed the strip
tion;
'
laterally across the feed table and into feeding position 60
FIG. 2 is a vertical section taken substantially along
thereon, whereupon its trailing short edge is engaged suc
the line 2_2 of FIG. l;
cessively by a plurality of reciprocating, spring~pressed
feed dogs, spaced one blank length apart, which feed
the strip longitudinally `and intermittently into the cutting
FIG. 3 is a vertical sectional View on an enlarged scale
taken substantially along the line 3_3 of FIG. l';
FIG. 4 is a sectional detail taken substantially along
dies.
65 the line Äi--ßl of FIG. 3;
To eliminate the present 'spacing between the strips,
FIG. 5 is a view similarto FIG. 4 but showing how
the instant invention contemplates that the lateral feed~
successive sheets are maintained in spaced, overlapped
ing of the strip across the feed table be started sooner
relationship as the succeedingsheet is inserted into the
than usual, so that the forward portion of the strip which
feed table, the position of the sheets 4in this View cor
is being inserted into the feed table overlaps the trail 70 responding to the position shown in FIG. 8;
ing portion of the preceding strip which is being fed lon
FIG. 6is a vertical sectional view taken substantially
gitudinally along the feed table and into the cutting dies.
along the line 6--6 of FIG. 3, the strip which is shown
3,034,783
3
4
in FIG. 3, being omitted in order to more clearly bring
out the details of construction of the various parts of the
rotated from the main drive of the press (not shown) in
mechanism.
_ FIG. 7 is an enlarged sectional detail of portions of the
mechanism shown in FIG. 6, the view showing succes
sive strips in position on the feed table and being moved
longitudinally in unison into the press by the feed dogs
of the press feeding mechanism of the instant invention;
FIG. 8 is a vertical sectional view taken substantially
along the line 8-8 in FIG. 7;
FIG. 9 is a plan view of a portion of the feed mecha
nism of the instant invention, taken substantially along
the line 9-9 of FIG. 6, parts being broken away, the
view illustrating successive strips in the position they oc
cupy during the first step of the present method inven
tion; and
FIGS. l0, l1, l2 and 13 are plan views illustrating
the succeeding steps of the present method invention.
any suitable manner, the rotary motion of the crank
wheel 54 being converted to a reciprocating motion of
the rod 52 by a crank arm 56, one end of which is con
nected to the crank wheel 54 and the other which is
connected to the rod- 52. As a result, the carrier bar 38
and the feed lingers 28 which are carried thereon are re
ciprocated in the groove 29 longitudinally of the feed
table T.
The strips S are held in a magazine M, which is se
cured to the frame 20 in any suitable manner, and are
lifted individually therefrom by a vacuum lifter unit
which comprises three suction cups 60 which are mount
ed at the lower ends of hollow slide rods 62 which are
suitably connected to a source of vacuum (not shown).
The rods 62 are mounted for vertical reciprocation in
upper and lower bearings 64, 66 respectively, of brack
ets 68 which are bolted onto a cross-plate 70 which is
carried by a pair of vertical supports 72 which are formed
As a preferred and exemplary embodiment of the in
stant invention, the drawings illustrate a press feeding 20 integral with the arms 32 (see FIG. l). The rods 62
mechanism, generally designated by the letter F, which
feeds double row, scroll cut strips S to the cutting and
forming dies D of a strip feed press P, only fragmen
are all secured by means of couplings 73 to a horizontal
carrier rod 74 which is connected to the outer ends of a
pair of rocker arms 76 by a pair of connecting links 78
as best seen in FIGS. l and 2.
tary portions of which are shown.
~
Each rocker arm 76 is freely mounted on a cross
` As best seen in FIG. l0, the strips S are formed with 25
scroll-cut inner and outer longitudinal edges I and O, and
scroll-cut front and rear edges F and R, respectively, the
configuration of the scroll cuts being such as to form
a muliplicity of blank spaces B, each of which is of suf
shaft 80 which is carried in a bearing 82 formed at the
upper end of a support bracket 84. At its opposite end,
each rocker arm 76 is secured to a vertical rod 86 which
at its lower end is associated with suitable cam means
:licient size to contain a potential can end or other article 30 ‘(not shown) which imparts to the rocker arm 76 a
which is subsequently cut from the blank space B along
reciprocatory motion which is converted to the necessary
a circular line C by the cutting and forming dies D. Each
oscillatory motion of the rocker arm 76.
strip S contains two rows of blank spaces B, one row
The topmost strip S2 in the magazine M is lifted to
the level shown in FIG. 3 by the suction cups 60, and its
being longitudinally offset from those in the other row
a distance equal to one-half of a blank space. Sufficient 35 upper surface, adjacent its front end, is thereby brought
into engagement with the lower surface of a magnet 100
which is secured to the outer face of the feed table cover
vide a scrap allowance which extends completely around
plate 27. The vacuum in the suction cups 60 is then
each circular line of cut C and insures the formation
cut olf and the cups 60 are vented, thus releasing their
of a clean cut by the dies D.
As seen in FIGS. l, 2 and 3, the press feeding mecha 40 grip on the strip S2. As soon as this occurs, the strip
S2 is inserted «into the feed table slot 31 by a pair of
nism PF includes a longitudinally extending frame 20
inserter or cross-feed yarms 90 which operate in slide bear
which is bolted to the main frame 22 of the strip feed
ings 92, 94 which are suitably secured to the frame 20.
press P in longitudinal alignment with the dies D. The
The inserter arms 90 `at their outer ends carry a pair of
frame 20 is formed generally in the shape of an inverted
U and its upper wall 24, together with a guide plate 25 45 depending inserter fingers 93 which engage the longitudi
nal outer edges O of the strips S.
which is formed with a guide wall 26 and a shelf 27,
The upper surface of each inserter arm 90 is formed
form a feed table T along which the strips S are fed
with a plurality of teeth 95 which are engaged by the
longitudinally into the dies D by a plurality of recipro
cating feed fingers or dogs 28 which operate in a groove
teeth of =a gear segment 96 (see FIGS. Zand 3) which is
29 which is cut into the feed table T. The feed table T 50 freely mounted for oscillation on the shaft 80 and is
is covered by a feed table cover plate 30 which on one
formed with an integral arm 98 which is connected to
side is spaced above the feed table T a distance some
the upper end of a vertical rod 100, the lower end of
what greater than the thickness of a strip S, as will later
which is associated with suitable means such as a cam
be seen, to form a feed table slot 31 into which the strips
(not shown) which reciprocates it vertically, the vertical
S are inserted. The plate 30 is supported by a pair of 55 reciprocation of the rod 100 imparting an oscillatory mo
arms 32 which are secured to the frame 20.
tion to the gear segment 96 which in turn imparts a re
'Ihe feed lingers 28 are pivotally mounted on pivot
ciprocatory motion to the inserter arms 90 which enables
pins 33 which are secured to feed finger holders 34 which
them to insert the strips S successively into the feed table
are adjustably secured in a groove 36 formed in a carrier
slot 31.
,
bar 38 (see FIGS. 3 and 6). Each feed linger 28 is 60
It will be understood that prior to the time the sheet
formed with a wide front portion 39 which is provided
S2 has been lifted from the suction cups 60 to the position
with a lateral bevel 40 and a forwardly facing V-shaped
shown in FIG. 3, the preceding sheet S1 had been inserted
front edge 41 which engages the trailing edges of the
into the feed table slot 31 «and its inner edge I brought into
scrap material is provided in each blank space B to pro
strips S to propel them along the feed table. The front
engagement with the guide wall 26 of the guide plate 2S
linger portion 39 is biased to its operative, raised posi 65 by the inserted arms 90. During its insertion, the strip
S1 had come into contact with the lateral bevels 40 of
tion by a leaf spring 42 which is secured in the holder
34, the upward movement of the feed finger 28 being lim
the feed ñngers 28 and had forced the feed fingers 28
ited by a stop bar 44 which forms a part of the holder
downwardly against the pressure of their leaf springs 42.
34 and engages the tail portion 46 of the feed finger 28
Thereafter, the reciprocatory motion of the carrier bar
to limit the counter-clockwise rotation which is imparted 70 38 had caused the rearmost feed finger 28 (the one to
the left yas seen in FIG. 10) to fall slightly to the rear
to the feed linger 28 by the spring 42.
of the rear edge R of the strip S1, with the result that
`One end of the feed finger carrier bar 38 is adjust
ably secured by means of a clamp 50 to a rod 52 which
thatA finger had been rocked upwardly by its leaf spring
42, so that the next forward stroke of the carrier bar 38
is slidably mounted in bearings 53 formed in the frame
20 and which is driven by a crank wheel 54 which is 75 had brought its front edge 41 into engagement with the
3,034,783
rear edge R of the strip S1 and had ycaused it to advance
the strip «a distance Iequal to the length of one blank
space B. On succeeding strokes of the carrier bar 38,
this «action had been repeated by the successive feed
lingers 28 with the result that the strip `S1 vhad been ad
vanced longitudinally :along :the feed table T in a step
by step lfeeding «action ‘until it had reached the position
6
the marginal scrap portions which are present in these
areas of the strips.
On succeeding forward strokes of the carrier bar 38,
both strips S1 and S2 are engaged by feed ñngers 28
yand are fed forward longitudinally in unison `and in over
lapped relationship along the feed table T, as seen in
FIG. 13.
shown in FIGS. 3 and 12, 4at which time the Alateral inser
As «they approach the dies D, the strips ride off the end
tion of the strip 'S2 into the slot 31 is begun.
of the feed table T and onto a pair ofv support plates 120,
-In this position, a portion of the rear end of the strip 10 122 (see FIG. 9) which are suitably mounted on the die
S1 rests upon :a rais-ing block 102 which is disposed in a
bed DB of the press P, and form portions of the die
recess 104 formed on the feed table T. The upper sur
table, `the vplate 120 forming lan extension of the depressed
face 105 »oíf -the block 102 is raised somewhat above the
portion 114 of 'the fra-me 20 and the plate 122 being
normal level of the upper surface of the adjacent feed
formed with a shelf 123 which forms an extension of
table wall 24 so that a >gap which is substantially equal 15 the shelf 27 of the guide plate 25. The carrier bar 38
to the thickness of one .strip S is created between the
block surface 105 Iand the bottom surface of the feed
table cover plate 30, for a purpose which will be shortly
and the two endmost feed ?ngers 28 carried thereon pro
ject beyond the end of _the feed table T and operate be
t-ween the plates 1201, 122.
explained. The raising block y102 is supported by four
In order to clamp the strips S1 so that there is no
adjustable studs 106 which in turn .are carried by a sup 20 chance of its being moved as the feed fingers 28 slide
pont 4plate 1'0'7 which is bolted to the fname 20, a plu
beneath it on the return stroke of the carrier bar 38, a
rality of springs 108 being interposed between the block
clamp 124 is pivotally mounted on a pivot pin 126 which
102 ‘and the plate 107 to provide -a floating mounting for
is mounted adjacent the end of feed table cover plate 30
the block 102 which permits it to move downwardly in
(see FIGS. 6 and 9). The end of the clamp 124 is formed
the event a double strip is inadvertently fed into 4the 25 into a pair of split fingers 127, which are urged by a
slot 31.
spring 128 into engagement with the ystrip S1 to press it
against the plates [120, 122.
FIG. 9 shows .a plan view of the relative positions of the
strips SS1 and S2 at the beginning of the forward stroke
During the simultaneous movement of the strips S1
of the carrier bar 3S and an inserting stroke of the inserte/r
and S2 toward the dies D, the rear edgeR of the Strip
bars `90, which strokes are so timed as to start substan 30 S2 is exposed and is easily engaged by the feed dogs 28
which feed the strip S2 along the feed table T. How
tially simultaneously. As a result of these strokes, the
ever, the rear edge R of `the strip S1 is not exposed, but
strip Sl is advanced along the feed table T toward the
underlies the front edge F of the strip S2 so that the feed
dies D as the strip S2 is moved laterally into the feed
fingers 28, which are held in depressed position by the
table slot 31. As seen in FIGS. 3 an-d l2, the forward
end of the strip S2 is held upwardly against the under 35 strip S2, could not under normal circumstances cleanly
and reliably engage the rear edge R of the strip S1. To
side o-f the cover plate ‘30 by the magnet 100 and is fed
laterally over `a ramp 110 which is secured to the mag
azine M yand which also serves to prevent the forward
overcome this, means are provided to depress the rear
movement of the strip S1 carries its rear edge R beyond
the raised portion of the block 102 and into position olver
a .step 112 which is formed in the front portion of the
block 102, thus permitting the rear portion of the strip
S1 to .drop down onto the step 112 land reach a level 45
are enabled to cleanly engage the rear `edge R of the
edge R of the strip S1 below the level of the overlying
front edge F of the strip S2 to separate these lapped edges
portion of the strip S2 from sagging.
As the strip S2 approaches the block V102, the forward 40 so that the strip engaging faces 41 of the feed iingers 28
strip S1.
To accomplish this, the shelf 2.7 of the guide plate 25
and the shelf 123 of the plate 120 are formed with a
series of inclined steps 130 which are spaced apart a dis
tance equal to the length of a feed `stroke of the carrier
which is `considerably below the level of the incoming
bar 38, and a corresponding number of spring buttons
strip S2. Tihe yupper surface of theçframe wall 24, from
132 and leaf springs 1:34 are mounted above the steps 130
the beginning of the step 112 to the dies D, is also stepped
to engage the strip S11 adjacent its rear edge R just ahead
downwardly to provide a lower level 114, as clearly seen
in FIG. 4, `so that the whole of the strip S1 is spaced below 50 of the front edge F of the -strip S2 at the end of every feed
stroke of the carrier bar 38 Aand press the rear edge R of
the strip S2. FIG. l0 shows the position of the strips
the Strip S1 downwardly into the steps 130 to thereby
S1 and S2 at the ycompletion of the forward stroke of the
space the rear edge R of the `strip S1 below the level of
carrier bar 33.
the front edge F of the strip S2, as best seen in FIG
During the return stroke of »the `carrier bar 38, fthe strip
URE 7.
S2 continues its lateral motion with the result that its
The spring buttons 132 are mounted in bores formed
forward portion overlaps the rearward position of the
in the feed table cover plate 30 `and are pressed down
strip S1, as clearly seen in FIG. 11, which shows the
wardly lby coil springs 136 which are disposed within the
carrier bar 38 at the completion of its return stroke.
buttons 132 and confined between the smoothly rounded
During this portion of its lateral motion, the strip S2 rides
13S ofthe buttons 132 and set screws 140` which
onto the raised surface 105 of the raising block 102, and 60 nose
are threaded into the cover plate 30. Each button 132 is
this block 102, in cooperation with the ramp 110 and
formed with a stop collar 142. VThe leaf springs 134 are
the magnet 100, positively maintain the strip S2 at a level
mounted in recesses `144 formed in the undersurface of
above the level of the strip S1, thus preventing any inter
the clamp 124.
ference between the strips and at the same time keeping
As best seen in FIG. 7 all of the spring buttons 132 and
65
any burrs which might be presenten the scroll cut edges
leaf springs ‘134, except one, are held in upward position
of either of the strips from contacting the other strip and
by the strips S1 and S2 at any given time by virtue of
scratching its surface during this strip inserting operation.
the fact that these strips ride upon yand bridge the high
On the next forward stroke Vof the canrier bar 38, the
portions 145 of the inclined steps 130, and the stiffness
strip S1 is moved forwardly one blank length, while the
70 of the thus supported strip portions is suiiicient to resist
strip S2 continues its :lateral motion and fully enters the
the downward pressure of the buttons 132 and leaf springs
feed table slot 31, so that its edge I contacts the `guide
134. However, the downward pressure of the buttons 132
Wall 25. FIG. l2 shows the strip S2 in this position,
and springs 134 is suflicient to flex the unsupported rear
wherein its front edge F slightly overlaps the rear edge
edge portion of the strip S1 downwardly onto the inclined
R of the strip S1, the overlapped portions comprising 75 step beneath it as that edge portion passes successively
3,034,733
7
.
S
beneath the buttons 132 and springs 134 as the strips are
cessively onto said support in longitudinal alignment with
fed intermittently by the feed ?ngers 28. During each
the rear edge of said preceding strip and the forward
edge of its next succeeding strip in overlapped relation
ship, feeding means engageable against the rear edges of
each of said strips for propelling them longitudinally and
feed stroke of the carrier bar 38, the rear edge portion
of the strip S1 rides up on an inclined step 130 and then
is pressed by the next button 132 or spring 134 into
the next inclined step 130. Thus the feed fingers 28 on
each feed stroke are enabled to cleanly engage the de
pressed rear edge R of the strip S1, even though they
simultaneously along said support in said overlapped rela
tionship, and means for spacing said overlapped strip
edges apart to facilitate said engagement of said feeding
themselves are maintained in a depressed position by the
strip S2, and the danger of misfeeding the lapped strip
10
means against the rear edges of said preceding strips.
5. A mechanism for feeding strips, comprising in com
S1 is eliminated.
As a result, the strips S1 and SZ pass through the
bination, a feed table, means for placing strips succes
cutting dies D, which `are disposed in staggered relation
preceding strips in underlapped relationship to the for
ward edges of the succeeding strips, reciprocating means
sively onto said feed table with the rear edges of the
ship one and a half blank lengths apart and occupy the
disposed in said feed table for engaging the rear edges of
positions designated as D1 and DZ in FIGS. 9 and 10, in
overlapped relationship, thus permitting the dies D to cut
said strips to advance them valong said feed table, a
longitudinal support shelf on one side of said reciprocat
two can ends during each cutting stroke, the absence of
a gap -between the strips resulting in maximum cutting
ing means for supporting a longitudinal marginal portion
efficiency of the press P.
of said strips, a cut away portion formed in said shelf,
As each strip S is fed along the feed table T, the suc 20 and presser means positioned above said cut away por
ceeding strip in the magazine M is inserted into the feed
tion for depressing the rear edges of the preceding strips
slot 31 in the manner just described, and the whole press
into said cut away portion when they pass beneath said
feeding operation is repeated, thereby insuring a con
presser means to space said rear edges beneath the adja
tinuous procession of overlapped strips into the dies D.
cent forward edges of the succeeding strips to thereby
It is thought that the invention and many of its attend 25 expose them to said feeding means.
ant advantages will be understood from the foregoing
6. The mechanism of claim 5 wherein said reciprocat
description, and it will be apparent that various changes
ing means comprise a plurality of spring backed feed
may be made in the form, construction, and arrangement
fingers which successively engage said strips to advance
of parts of the apparatus mentioned herein and in the
them intermittently along said feed table.
steps and their order of accomplishment of the method 30
7. The mechanism of claim 6 wherein said support
described herein, without departing from the spirit and
shelf is provided with a plurality of inclined steps, and
scope of the invention or sacrificing all of its material
wherein spring means are positioned above said inclined
advantages, the apparatus and method hereinbefore de
steps to press the rear edges of said strips into said steps
scribed being merely a preferred embodiment thereof.
as the strips are advanced along said feed table by said
I claim:
35 feed fingers.
1. The method of feeding strips, comprising the steps
8. A mechanism for feeding strips comprising in com
of moving successive strips laterally into longitudinal
bination, a feed table, a cover plate for said feed table,
inserting means for moving strips laterally yacross said
trailing and the leading adjacent marginal edge portions
feed table and into fully inserted position between said
of successive strips during said lateral movement, spacing 40 feed table and said cover plate, a plurality of reciprocat
alignment with a treating machine, overlapping only the
said overlapped marginal edge portions apart vertically,
and pushing against the trailing marginal edge portions
ing feed fingers operable in said feed table for feeding
said fully inserted strips longitudinally along said feed
table, the relative timing of said inserting means and
of said strips to move said strips longitudinally and simul
taneously into said treating machine in said overlapped
relationship.
2. The method of feeding strips, comprising the steps
of moving a strip laterally into longitudinal alignment
with a treating machine, moving said strip longitudinally
feed fingers being such that the insertion of each suc
45
ceeding strip is completed before the next preceding
strip has been moved longitudinally past it so that each
succeeding strip slightly overlaps the strip preceding it,
and means for depressing the trailing edge of each such
preceding strip to expose it to said feed fingers so that
ing a succeeding strip laterally into alignment with said 50 said preceding and succeeding strips are fed along said
treating machine to thereby overlap a portion of said
feed table in unison in lapped relationship.
toward said treating machine While simultaneously mov
longitudinally moving strip, and thereafter moving both
of said strips longitudinally into said treating machine in
9. The mechanism of claim 8 wherein means are pro
vided to hold each strip against the feed table cover plate
overlapped relationship.
while it is being inserted to prevent it from contacting the
3. The method of feeding strips comprising the steps 55 strip already on the feed table.
of placing a supply of strips in a stack in lateral align
l0. The mechanism of claim 8 wherein a portion of
ment with the feed table of a treating machine, moving
said feed table is depressed to permit the strip already in
a strip from said stack in a lateral path onto said feed
the feed table to descend to a lower level to space it
table and propelling it in a longitudinal path along said
below the incoming strip which is being moved across it.
feed table toward said treating machine, said longitudinal 60
11. The mechanism of claim 8 wherein a plurality of
path being spaced below said lateral path by a depth not
inclined steps are formed in said feed table and wherein
less than the thickness of a said strip moving the succeed
spring members are positioned above said inclined steps
ing strip from said stack along said lateral path to bring
to successively depress the trailing edge of each preced
the forward edge of said succeeding strip into overlapped
in; strip below the overlapping leading edge of the next
relationship with the trailing marginal edge of said pre 65 succeeding strip to expose said trailing edge to said feed
ceeding strip, pressing the overlapped portions of said
ñngers to facilitate the longitudinal movement of said
strips apart, and pushing against the rear edges o‘fvboth
preceding strip along said feed table.
of said strips to propel them simultaneously along said
feed table and into said treating machine in said over
References Cited in the íile of this patent
lapped relationship.
70
UNITED STATES PATENTS
4. A mechanism for feeding strips, comprising in com
2,375,989
Hale _______________ _- May 15, 1945
bination a strip support, means for placing strips suc
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