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Патент USA US2108935

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Feb. 22, 1938. ‘
w. H. DRAPER
2,108,935
FOLDING MACHINE
Filed April 24, 1955
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Feb. 22, 1938.
w. H. DRAPER
FOLDING MACHINE
2,108,935
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Filéd April '24, 1935
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Feb. 22, 1938.
2,108,935
W. H. DRAPER
FOLDING MACHINE
Filed April 24, 1-955
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Feb. 22,‘ 1938.
W. H. DRAPER
2,108,935
FOLDING MACHINE
Filed April 24, 1955
5 Sheets-Sheet 4
Feb. 22, 1938.
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' 2,108,935
FOLDING MACHINE
Filed April 24, 1935
5 Sheets-Sheet 5
2,108,935!
Patented Feb. 22, 1938
UNITED STATES PATENT OFFI€E
2,108,935
FOLDING MACHINE
William Horace Draper, Bristol, England
Application April 24, 1935, Serial No. 18,062
In Great Britain June 21, 1934
13 Claims.
I)
(Cl. 270-—61)
This invention relates to paper folding ma
chines of the kind in which the sheets to be folded
are conveyed to the folding mechanism of the ma
chine by what is generally known as a tape feed.
In the known machines of this kind which are
provided with a number of folding devices en
abling a number of folds to be applied to a sheet
in quick succession the rotary speed of the fold
ing rolls, the speed of the tape feed for conveying
l
the unfolded sheet to the ?rst folding device and
for registering the sheet relatively thereto and the
speed of the tape feeds for conveying the partly
folded sheet respectively to the subsequent fold
ing devices are de?nitely correlated and invari
able. The maximum speed at which accurately
folded sheets. can be delivered from such a ma
chine or in other words the output of the machine
depends largely if not wholly upon the maximum
speed at which the feed tapes can feed accurately
registered sheets to the ?rst folding rolls and
20
unless the unfolded sheet is accurately registered
before the operation thereon of the ?rst folding
device faulty folding cannot be avoided.
For this reason in such tape fed multi-folding
machines it has been necessary hitherto irrespec
tive of the nature of the paper stock to be folded,
to feed the sheets thereof over the initial tape
feed to the ?rst folding device at de?nite inter
vals in order to provide the requisite clearance
between them and enable a sheet in front of
driven from the main drive of the machine for
driving the tape feed and the feed supply there
to at a given speed such as the set normal speed
of the machine and another unit driven from the
main drive and adapted to drive the tape feed at
a modified or reduced speed while the other unit
continues to drive the feed supply to the tape
feed from the main drive at the normal speed of
the machine. For the application of this inven
tion to. a folding machine provided as above men?
tioned with a plurality of consecutive tape-fed
folding devices the use of one common or in
variable speed for all the tape feeds throughout
the machine is departed from and a variable tape
feed according to this invention is substituted
for that tape feed in such machines- by which the
sheets are conveyed from the feeder or feed table
initially into the machine, thus enabling the
speed of this initial or ?rst tape feed to be ar
bitrarily reduced relatively to the normal speed
of the other tape feeds or operating speed of the
machine. By thus reducing or slowing down the
delivery of the sheets to the ?rst fold lay to the
lowest possible limit perfectly accurate registra
tion and folding can be assured for‘ sheets of the
thinnest paper stock and in addition the sheets
can be fed into the machine in close continuity
that is to say without any appreciable clearance
between them or any risk of bulging or overlap
ping while maintaining the normal or maximum
another sheet to be properly registered at the
usual registering lays before being seized by the
folding speed throughout the whole of the fold
ing devices. The result therefore is that not
fold rolls and the consecutive sheet could take
its place without overlapping or fouling. This
precaution is essential in any case when sheets of
the machine because of its relative independence
average paper stock are to be folded but with
particularly thin stock due to the tendency of thin
paper travelling at relatively high speed to‘ bulge
or to become buckled on its impact with the lays
40 referred to it has been found that in machines
having an invariable speed for all the tape feeds,
the folding of thin stock has become most di?icult
and impracticable due to the poor output result
ing therefrom.
The object of this invention is to provide means
adaptable with particular advantage to; such
tape~fed multi-folding machines and enabling
the above difficulty to be overcome and a maxi
mum output of accurately folded sheets to be
4) ensured irrespective of whether stock of normal
thickness or abnormally thin stock such as for
example India or Bible paper is to be handled.
To this end according to this invention pro
vision is made of a tape feed which is associated
5 with a change speed device comprising a unit
5
only can accurate folding of any stock be safe
guarded, but the normal or maximum speed of
of the speed of the initial tape feed can, com
pared with existing machines, be much higher
and the maximum output of the machine can
accordingly be likewise increased. The change
speed device employed according to this inven
tion in the form of individual units is in this case
interposed between the driving gear of the ma
chine and the initial tape feed. The gear units
referred to (sprocket wheels being used by pref
erence) are simultaneously driven through in
dividual connections from the main drive and
adapted one at .a time to be brought into operative
connection with said tape feed while their sepa
rate driving connections with the main drive are
maintained in operative condition.
A simple constructional form of the invention
is illustrated in the accompanying drawings
showing its application by way of example to a
knife folding machine provided with ?ve knife
folding devices.
'
55
2
2,108,935
Fig. 1, la is a lateral elevational view of the
machine showing part of the feed table on the left
hand side.
Fig. 2, 2a is a plan view clearly indicating the
different tape feeds.
Fig. 3 is a front or face View looking from the
left of Fig. 1 and
7
Figs. 4 and 5 are right angle detail views of the
shaft D2 from which, as will be seen, the various
fold rolls in the stations III, IV and V are driven
by the transmissions C3, C4 and C5 already re
ferred to.
It will be observed that the rolls of folding sta
tion I’ driven by the chain drive C’ derive their
motion from the stub shaft D’, the fold roll set
in each station being equipped with the requisite
Variable tape feed according to this invention 7 gear set through which motion is imparted also
10 and represent enlargements respectively of the
corresponding parts shown in Figs. 1 and 3.
The machine frame A is constructed of the
usual longitudinal and upright members forming
the requisite supports for the series of folding de
15 vices and for the driving and actuating mecha
nism thereof.
There are ?ve folding stations
represented by knife folding devices indicated in
this example at I, II, III, IV and V each com
. prising as is known two fold rolls geared together
20 and suitably driven at the requisite speed and a
knife blade time-actuated to force the paper into
the bite of the rolls thereby producing a fold.
The sheets are fed to the machine initially by
feeder mechanism U consisting of two series, of
drop-feed rollers V, V’, carried by arms secured
to a rock-shaft W. The rock-shaft W is moved
in timed manner by cam and cam-follower mech
anism X so as alternately to lower either the roll
30
ers V on to a drum Y or the rollers V’ on to a
drum T. The cam mechanism X is driven
through adjustable gearing by the shaft of the
drum Y which, in turn, is rotated by a feeder
wheel F’ driven from the main drive of the ma~
chine in a'manner hereinafter described.
35
The feeder mechanism operates by reason of
the rocking of the rollers V on to the drum Y, to
engage a sheet and move it on to the feed table F
and drum T and then, by the reversal of the posie
tion of the rollers so that the rollers V’ are
40 brought into contact with the drum T, to feed the
said sheet tothe machine proper.
To the folding stations I and III the sheets are
fed from the feed table F by an initial tape feed
T’ composed as usual of a number of parallel
45 tapes in the form of endless conveyors running
over appropriately driven rollers. A similar tape
feed T2 is provided to convey sheets from the
folding station I to thestation II, a tape feedrT3
to feed sheets from the latter to the folding sta
50 tion IV and a tape feed T4 to convey sheets from
station IV to the folding station V. All the fold
rolls at the various knife folding stations are
geared and driven in known manner at a uni
form speed which for every particular machine
55 of this type is as a rule chosen to be the maximum
operating speed of the machine.
The folding
knives of the knife folding devices are actuated
, in
known
manner
in requisite synchronism
through cam gear mechanism'which for the sake
60 of clearness since they are well known in the
art have been omitted from the accompanying
drawings. The driving connections are only
diagrammatically indicated, a belt or chain drive
being shown at C’ for driving the fold rolls of the
65 station I, a chain’ drive C2 for driving the rolls
of thestation II, a similar drive 03 for driving
the fold rolls at folding station III, a drive C4
for driving the fold rolls at station IV and C5
for driving the fold rolls at station V. The main
70 driving shaft D receiving its motion from a pulley
P is journalled in bearing brackets B mounted on
the lower front face portion of the frame A.
Through a conical gear train G and a longitu
dinal stub shaft D’ driving motion is imparted
75 from the driving shaft D to a secondary driving
to the adjacent tape drums, the tape feed T’ be
ing geared to the folding station III, the tape
feed T3 to the folding station IV and the tape
feed T4 being driven from the folding station V.
At the initial feeding point indicated in Fig. 1
by the inner endof the feed table F the tapes 15
of the ?rst tape feed T’ are laid over the drum
T which is mounted on a shaft S journalled in
bearing brackets B’ parallel with the driving
shaft D. The drum shaft S is driven from the
driving shaft D through a change speed arrange
ment shown in greater detail in Figures 4 and 5.
Pinned to the shaft D are as shown two sprock
et Wheels H and H’ adapted to drive corresponding sprocket wheels H2 and H3 by means respec
tively of the chains C6 and C7. The sprockets
H2 and H3 are each loosely rotatable on the shaft
S which carries the tape drum T forming the
driving member in this case of the ?rst tape feed
T’. Pinned or otherwise secured to the shaft S
are ?anged sockets L and L’. To each of the
sprocket‘ wheels 1-12 and H3 on the shaft S are
secured, similar ?ange members L2 and L3 re
20'
"
25.
30
spectively with their free faces adjacent to those
of the sockets L, L’. The sprocket wheel H3
carries on its opposite face likewise loose on the 35
shaft S a pinion K which during the operation
of the machine serves to drive the feeder Wheel
F’ associated with the feeder mechanism. The
?ange members 'L, L2 and L’, L3 respectively
form members for coupling the sprocket wheels
H2 and H3 to the shaft S. To this end the mem
bers L and L’ are each provided with a hole M
40V
and the flanges on ‘the adjacent members Lzand
L3 have tappedholes M’ which can be brought
into register with the respective holes M in the 45
?anges L and L’. A coupling bolt N screwed into
one or the other of the registering pair of holes
M, M’ serves to place one or the other of the
sprockets VH2, E3 into, driving connection with
the drum shaft S. It will be noted that the 50
sprocket wheels on the two shafts D and S have
respectively different diameters and as the ratio
between the diameter of the sprockets H, H2 is
different from that between the sprockets H’,
IF, it will be apparent that different speeds will 55
be imparted to the tape drum T from the shaft
S according to whether the drive H’, 07, H3 or
the drive H, C6, H2 is taken into use. In other
words the rotary speed ’ of the tape drum T
through the shaft S may be varied relatively to 60
that of the driving shaft D by coupling either
the sprocket H2 or the sprocket 1-13 to the drum
shaft S as may be required and accordingly the
feed speed of the initial tape feed T’ may be in
dependently varied in relation to that of the re 65
maining tape feeds and other devices which deé
rive their uniform maximum working speed from
the driving shaft D through the connections
hereinbefore already explained. This maximum
speed is imparted from the driving shaft D to the
drum shaft S by causing the drive to the'shaft
S to be transmitted‘through the chain drive H’,
C7, H3,'in which case the tape feed T’ driven by
the tape drum T will travel at the same speed as
all the other tape feeds. When however driving
w
2,108,935
motion from the shaft D is imparted to the
drum shaft S through the chain gear H, C“, 1-12
the tape feed T’ will travel at a reduced speed
relatively to that of the other tape feeds. It
will be observed that the change from one speed
to the other of the tape drum T by coupling
either the sprocket wheel H2 or sprocket wheel H3
to the drum shaft S may be effected by this ar
rangement while both these sprocket units remain
in driving connection with the respective sprock
et wheels H, H’ on the driving shaft D in that
while the sprocket unit H2 is coupled to the shaft
S for driving the latter from the driving shaft
D at reduced speed through its chain connection
C6 the sprocket wheel I-I3 turning loosely on shaft
S is simulaneously driven by its connection C’I
from the driving shaft D thus continuing to drive
the feeder wheel F’ through the pinion K secured
to it for that purpose. Then if the sprocket
H3 is coupled to the shaft S to impart to the
initial tape feed T’ the higher or normal operat
ing speed of the machine the sprocket H2 now
uncoupled continues to turn loose on its shaft.
li'c disruption therefore of the driving connec
tion C6 or C7 is necessary. In the drawings R
indicates the usual stops or lays against which a
sheet is advanced by the corresponding tape feed
for proper registration before or just as the knife
is operated to force the paper down into the
30 bite of the respective fold rolls to make a fold.
For right angle or cross folding the fold station I
and thereafter any one or more of the consecu
tive folding devices II, IV and V may be used.
For parallel folding the fold stations I and II are
not used and if therefore sheets are to receive
parallel folds only as is customary particularly
in the case of India or Bible paper the folding
devices I and II are cut out in the well known
manner by disconnecting and thereby arresting
their folding blades.
In the operation of the machine when ordinary
paper stock is to be cross folded at normal oper
ating speed of the machine the sheets fed from
the feeder U in travelling over the ?rst tape
45 feed T’ to the ?rst folding station I are as usual
spaced apart sufficiently to prevent overlapping.
The normal drive connection H3, 0'’, H’ is used
for driving also the initial tape feed T’ by lock
ing the sprocket H3 including the gear wheel K
to the drum shaft S. A first fold will be given to
50
the sheet in station I whence it drops from the
fold rolls of that station on to the tape feed T2
to be conveyed at right angles to station II to
receive a fold at right angles to the ?rst fold
55 whereafter it is carried over the tape feed T3 to
the folding station IV to be given a third fold
parallel to the second fold and then over the tape
feed T4 to the last folding station V where it re
ceives a last or fourth fold again parallel to the
60 preceding fold. For parallel folding only or
when thin paper is to be dealt with the folding
stations I and II are as already stated rendered
inoperative and the ?rst front lays R are with
drawn so as to provide for a free passage of the
paper over the initial tape feed T’ to the ?rst
operative folding device which is now at station
III. The coupling bolt N is withdrawn from the
?ange members L’, L3 and inserted in the cou
pling holes M, M’ of the flange members L’ and
70 L2 thereby establishing driving connection
through the chain drive H2, (36 and H, the sprock
et H3 and pinion K being thus disconnected from
the tape drum shaft S but continue to be driven
independently thereof direct from the driving
75 ‘shaft D. The drive of the tape feed T’ is thus
3
now effected through the sprockets H and 1-12 at
the requisite reduced speed while the feeder F’
is still driven at the normal rate by way of the
gear K which is in driving connection with the
sprocket H3. As a result of this the feeder wheel
delivers sheets as rapidly as before while the tape
feed T’ is moving, however, more slowly. Conse
quently the sheets so fed are carried slowly but
in close continuity direct to folding station III
where after accurate registration at the lays and 10
without risk of overlapping or buckling they are
quickly seized and folded at the unreduced fold
ing speed of the machine. Here after receiving
one fold they are either delivered or if required
caused to pass through folding stations IV and V
over the tape feeds T3 and T4 respectively. Hav
ing been folded once they are smaller and thicker
and therefore no longer apt to give trouble in
travelling over the normally driven tape feeds
'I‘3 and T4 to the registering stops at these sta
tions. It will be appreciated therefore that by
the embodiment of the invention as hereinbefore
explained the same compound folding machine is
capable of performing the work of two separate
machines hitherto customarily employed inas 25
much as it can be used equally well for thin and
thick paper stock and can be built at the outset
for running at a relatively higher normal oper
ating speed than was hitherto possible with the
resulting additional advantage of a correspond
ingly increased output of accurately folded
sheets.
It will be appreciated by those skilled in the art
that a variable tape feed as herein explained
constitutes substantially a self-contained unit for 35
attachment capable of being applied to or em
bodied in a folding machine irrespective of
whether the latter is provided only with one or
with a plurality of consecutive folding devices
and moreover that the speci?c embodiment of 40
the invention as herein described may be readily
adapted for use with any particular machine or
varied constructionally also by the use of other
equivalent speed gear types.
45
I claim:
1. In a folding machine of the character de
scribed, a feeder, at least one folding device, a
tape feed for conveying paper sheets from said
feeder to the folding device, a tape feed driving
shaft, a main drive shaft in timed driving con 50
nection with said folding device, a unit on said
tape feed driving shaft, means for driving said
unit at one speed from said main drive shaft,
a second unit on said tape feed driving shaft,
means for driving said second unit at a differ
ent speed from said main drive shaft, means for
driving said feeder from said second unit, and
means for selectively coupling said units to said
tape fee-d driving shaft.
2. A folding machine of the character de
scribed, comprising at least one folding device,
a feeder, a plurality of conveyor tapes for convey
ing paper sheets from said feeder to said folding
device, a tape carrying and driving drum, a shaft
carrying and driving said drum, a unit loosely 65
mounted on said shaft, a main drive in timed
connection with said folding device, means for
transmitting motion from said main drive to
said unit to cause the unit to rotate at one speed,
a second unit loosely mounted on said shaft, 70
means for transmitting motion from said main
drive to said second unit to cause the second
unit to rotate at a different speed, means for
transmitting motion from said second unit to
said feeder, and means for selectively coupling 75
4
2,108,935
said units to said shaft to cause said shaft to
sheet feeding thereto, the combination with said
rotate at the speed of one of said units.
3. A folding machine of the character de
scribed, comprising a plurality of conveyor tapes,
single tape feed of a change speed device for
driving said tape feed at either of two predeter
mined speeds suitable to the requisite sheet feed;
a tape carrying and driving drum, a shaft car
rying and driving said drum, a feeder for sup
plying sheets to said tapes, a unit loosely mount
ed on said shaft, a main drive, means for trans
mitting motion from said main drive to said unit
ing speeds of the two respective folding devices.
8. In a tape-fed paperfolding machine accord
ing to claim 7, in which the change speed device
comprises tWo gear wheels driven simultaneously
and individually from said driving shaft, each of
,
to cause the unit to rotate at one speed, a second
said gear wheels being adapted to establish driv
unit loosely mounted on said shaft, means for
ing connection between said tape feed and said
transmitting motion from said main drive to
said second unit to cause the second unit to ro
tate at a different speed, means for transmitting
motion from said second unit to said feeder, a
coupling element carried by each unit, a coupling
element associate-d With each unit and ?xed to
said shaft, and means for selectively rendering
10
driving shaft independently of the other while
the driving connections of both with said driving
shaft are maintained.
'
. 9. In a tape-fed paper folding machine hav
rying and driving said drum, a feeder’ for sup
plying sheets to said tapes, a unit loosely mount
ing a driving shaft, a tape feed, two folding de
vices each associated with said tape feed and
adapted to be. operated at a common operative
folding speed but requiring different speeds of
sheet feeding thereto, and a shaft for actuating 20
said tape feed, the combination with said tape
feed of tworwheels associated with the shaft of
said tape feed, said wheels being each loosely ro
tatable on said shaft and adapted to be coupled
ed on said shaft, a main drive, means for trans
individually and selectively thereto for driving
mitting motion from said main drive to said unit
said shaft at one of the two speeds required by
one of said folding devices, while being simulta
neously driven through individual driving con
, said coupling elements operative.
>
4. A folding machine of the character de
scribed, comprising a plurality of conveyor tapes,
a tape carrying and driving drum, a shaft car
to cause the unit to rotate at one speed, a second
unit loosely mounted on said shaft, means'for
transmitting motion from said main drive to said
30 second unit to cause the second unit to rotate at
a different speed, means for transmitting mo
tion from said second unit to said feeder, a
coupling element carried by each unit, a coupling
element associated with each unit and ?xed to
said shaft, the coupling element carried by one
unit and the associated element fixed to the
shaft having bores therein‘ adapted to register,
the coupling element carried by the other unit
and its associate having similarregistering bores,
and means adapted to enter the bore of the cou
pling elements of a selected unit to connect said
unit to the shaft and impart rotation thereto.
5. In a tape-fed paper folding machine, the
combination of a main drive, two folding de
vices each a-dapted to be operated at the same
speed in timed manner from said main drive, a
feeder likewise driven from said main drive, a
single tape feed for conveying paper sheets from
said feeder to either of said folding devices, and
change speed means for driving said tape feed
from'said main drive at one of two predeter
mined speeds correlated respectively with each
7 of the two folding devices.
6. In a tape-fed paper folding machine having
a main drive, at least two folding devices adapted
to be operated at the same speed in timed man
ner from said main drive and a feeder, the com
bination of a singletape feed for, conveying pa
per sheets from said feeder to'either of said two
60 folding devices and a change speed device com
prising a unit driven from the main drive 'for
driving said feeder at the same operative speed
as said folding devices and for driving said tape
feed at a speed correlated tonne of said folding
devices, and a unit driven from said main drive
and’ adapted to drive said tape feed, at a modi?ed
speed correlated to the other of said folding de
vices while the other unit continues to driversaid
feeder from the main drive at said given speed;
'7. In ,a tape-fed paper folding machine pro
vided with a driving shaft, a plurality of consec
' _ utive tape feeds, two folding devices each asso
ciated with one of said tape feeds and adapted
to be operated at a common folding speed by said
75 driving shaft but requiring different speeds of
nections from said driving shaft.
7
10. In a tape-fed paper folding machine hav
ing a driving shaft, a tape feed, two folding de
vices each requiring a different speed of sheet
feeding thereto and associated with said 'tape
feed, and a shaft for actuating said tape feed,
the combination with said tape feed of two gear
wheels loosely rotatable on the shaft for actuat
ing the tape feed and in different ratio driving
connection with said drivinglshaft, a coupling
member mounted on said shaft in association
with each of said gear wheels, and means adapted
to‘ establish operative connection respectively
between each of said gear. wheels and said shaft
through its associated coupling member inde
pendently of the other for driving said tape feed
at one of the, two speeds correlated respectively 45
with each of said folding devices.
11. Ina tape-fed paper folding machine hav
ing a tape feed, a feeder for supplying paper
sheets to said tape feed, a knife folding device
associated with said tape feed and arranged to
produce folds parallel with the direction of said
tape ‘feed, a second knife folding device asso
ciated with said tape feed and arranged to pro—
duce folds at right angles to the direction of said
tape feed, and a main drive in timed driving con- '
nection with each of said folding devices, the
combination with said tape» feed of a change
speed device comprising a high speed wheel unit ,
and a low speed wheel unit simultaneously and
individually driven from the main drive and, 60,
adapted to be selectively connected to said tape
feed for driving said tape feed at a high‘speed
for use with the ?rst knife folding device and
at a predetermined reduced speed for usewith
the second knife folding device, and an auxiliary
gear wheel associated with said high speed wheel
unit for continuously driving said feeder from
said main drive irrespective of the speed imparted
tor-said tape feed from the low speed wheel'unit.
12. In altape-fed‘paper'folding machine pro
vided with a plurality of consecutive tape feeds,
two knife folding devices associated with the ?rst
of said tape feeds, a feeder for supplying paper
sheets to said first tape feed, and a driving shaft
in timed driving connection with each of said‘
2,108,985
folding devices, the combination with said ?rst
tape feedof a change speed device comprising sep
arate high and low speed units simultaneously
driven through individual driving connections
from said driving shaft and adapted to actuate
said ?rst tape feed at high and reduced speeds
correlated respectively with each of said knife
folding devices associated with said tape feed,
and an auxiliary gear wheel associated with said
10 high speed unit for continually driving said feeder
at a constant speed with respect to said driving
shaft and said folding device irrespective of the
speed simultaneously imparted to said ?rst tape
feed through the low speed unit.
15
13. In a tape-fed paper folding machine hav
5
ing a tape feed, two knife folding devices ar
ranged to produce folds at right angles to one
another associated with said tape feed, a drive
for said tape feed and a driving shaft, the com
bination with said tape feed drive of two separate
change speed units in the form of sprockets as
sociated with said tape feed drive each connected
and continually driven respectively from corre
sponding units secured to the driving shaft, and
means for selectively coupling one of said change 10
speed units to said tape feed drive to effect the
driving of said tape feed drive at one of two
speeds correlated respectively with each of said
knife folding devices.
WILLIAM HORACE DRAPER.
15
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