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Патент USA US2403394

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July 2, 1946.
J. E. PRESTON
2,403,394
COMBINED FOLDING AND STACKING MACHINE
Original Filed March 27, '1942
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INVENTOR
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'BY
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ATTORNEYS
July 2, 1946.
J. E. PRESTON
2,403,394
COMBINED FOLDING AND STACKING MACHINE
Original Filed March 27, 1942
6 Sheets-Sheet 2
INVENTOR
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JZ‘IHN E. P/i’ié‘ TON
ATTORNEYS
July 2, 1946-
J. E. PRESTON
2,403,394
COMBINED FOLDING AND STACKING MACHINE
Original Filed March 27, 1942
6 Sheets-Sheet 3
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. INVENTOR
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ATTORNEYS
July 2, 1946.
'
J. E. PRESTON ‘
2,403,394
COMBINED FOLDING AND STACKING MACHINE
Original Filed March 27, 1942
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BY
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July 2, 1946.
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J. E. PRESTON
2,403,394
COMBINED FOLDING AND STACKING MACHINE
Original Filed March 27, 1942
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July 2, 1946.
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COMBINED FOLDING AND STACKING MACHINE
Original Filed March 27, 1942
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INVENTOR
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JOHN 5. Pass TON
BY
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ATTORNEYS
Patented July 2, 1946 _
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7 2,403,394
UNITED STATES PATENT OFFICE
2,403,334‘
7 COMBINED FOLDING ANDv STACKING
MACHINE
John E. Preston, Northport,’ N. Y., assignor to The
American Laundry Machinery Company, Cin
cinnati, Ohio, a corporation of Ohio
Original application March 27, 1942, Serial No.
436,466. Divided and this application December
a,v 1943, Serial No. 513,332.
-
3 Claims. ' (Cl. 270—82)
1
.
2
tile fabrics, for example, sheets, towels, pillow
omitted to expose interior operating mechanism;
Fig. 2 is a plan view of the machineshown in
Fig. 1; Fig. 3 is an end elevation, illustrating
the upper longitudinal folding mechanism shown
in Fig. 1; Fig. 4 is a detail longitudinal section
on the line 4-4, Fig. 3; Fig. 5 is a sectional eleva
tion on the line 5-5, Fig. 2; Fig. 6 is a cross sec
slips or the like.
tion on the line 6—8, Fig. 2; Fig. '7 is an enlarged -
In folding and stacking ?at articles it has been
customary to operate the combined machine in
cycles, one cycle beginning with the folding op
eration or operations and terminating with the
longitudinal sectional elevation, on the line 1-1,
Fig. 2; Fig. 8‘is a detail sectional elevation of the
cross folding blade mechanism, on the line 8—8,
Fig. 7; Fig. 9 is a sectional elevation on the line
completion of the stacking operation upon the
9—9, Fig, 1; Fig. 10 is an enlarged detail frag
This invention relates to combined foldingand
stacking machines and to the control apparatus
or devices therefor. It has more particular, rela
tion to machines for folding and stacking small
flat articles made of any material, such as paper
sheets, or more or less limp articles made of tex
mental view of the stacker counting mechanism,
upon the next succeeding article, and so on. In ll looking in the direction of the arrows lll-—l0,
Fig. 9; Fig. 11 is an enlarged side elevation, cor
such machines, especially when adapted for fold
ing and stacking articles of various lengths, it has
responding to Fig. _1, of the clutch mechanism:
same article, whereuponthe cycle was repeated
frequently happened that the length of the article
Fig. 12 is a detail section on the line 12-42, Fig.
taken with the established time delay in stacking,
11; Fig. 13 is a detail section on ,the line l3-I3,
Fig. 12; Fig. 14 is a diagram, illustrating the cir
cuits for the timing and measuring control de
vices; and Fig. 15 is a detail diagrammatic view
or other causes, has prevented the article from
fully entering the stacking position before op
eration of the stacker, with the result of an im
proper or faulty stacking operation or the jam
ming of the stacking mechanism.
One object of the present invention is to over
come this objection to prior machines for the
purpose, and to insure proper stacking and pre
vent jamming at all times.
‘
of certain switch mechanism.
In some respects, the folding machine of the
present invention is capable of wide use and for
a variety of purposes. Generally speaking, it em
, bodies means for performing an operation with
.
respect to each of a series of articles differing
Another object is to provide an improved com
in length, means for producing relative movement
bined folding and stacking machine in which the
between such performing means and the article,
folding and stacking operations are initiated and
and time delay means operating over a period
go on simultaneously, but upon. different articles 1 » of time while such relative motion is going on
in the line.
for delaying and determining the time and place
Still another object is toprovide improved
mechanism of the character described, in which 35
the folding and stacking machines are co-related
by association with the same'control devices, so
' that they operate simultaneously and not in se
of ‘performance of such operation with respect
to the articles.
I
‘My copending application for Sequence timer
and measuring control, Serial No. 436,465, ?led
March 27, 1942, illustrates, describes and claims
quence, thus insuring full delivery of the work
various ‘embodiments of such a machine. Ac‘
to the stacker before it begins to operate.
40 cording to that disclosure, each of a series of
A further object is to provide improved com
articles may be measured and after a preselected
bined folding and stacking mechanism of the
time delay period its length may be indicated or
character described, in which the stacking ma
recorded. 01', each of a series of articles vary
chine may be manually operated at any time, such
ingin length may be out or punched or indented
45
as to clear the machine of the last article at the
at one or more points in vproportion according to
end of a series.
. '
its total length, such as at its middle point, or
Further objects of the invention in part are
at a point one-third from its end, orat several
obvious and in part will appear more in detail
points. Or, sheets of paper of varying length
hereinafter.
_
may be imprinted, or some other operation may
This application is a division of my prior ap 50 be performed upon them, at one or more points
plication for Folding machine and control there
proportioned according to their length.
for, filed March 27, 1942, Serial No. 436,466.
For convenience, and in no sense of limitation,
In the drawings, Fig. 1 is a side elevation of
I have here illustrated as one suitable embodi
one form of folding machine embodying the in
ment, a machine for folding relatively small more
vention, certain of the panels and guards being
or less limp fabric articles, such as pillow slips,
2,403,394
3
towels or the like, although the invention is un- ‘
the middle part of the article ?at and straight,
it is held down by a riding plate 32, which rides -
derstood not to be so limited but to include all
mechanism within the scope of the claims ap
upon the moving article and upon the upper sur
face of which the right edge of the article is
folded. This plate, in the present machine, is
pended hereto. The machine illustrated first will
be described in detail, following which its various
made thin and it is also yieldable so as to offer
attributes will be set forth in ampli?ed form as
light downward pressure and yet enable the plate
The machine shown in the drawings is designed , to rise slightly and accommodate itself to any
to accomplish two kinds of fold in the article, i multiple or extra thickness of the article, as at
to-wit, a longitudinal'fold or folds, and a, trans 10 hems. It also is electrically conductive, form
ing part of the circuits, as will later appear. For
verse fold or folds. Thus the machine includes in
this purpose the riding plate 32 is carried by a
order elements which may be generally referred
the description proceeds.
to as follows:
Afeeding device E upon which the articles are
support consisting of a thin ?exible metal plate
- Longitudinal folding mechanism F which pro
duces one or more folds extending longitudinally
the riding plate 32. The’ outer edge portion of
32a mounted on support brackets 33 but insulated
delivered or laid out and which accomplishes their 15 from other parts by washers 32b (Figs. 3 and 4).
The folding line for the right hand part of the
introduction to the conveying and longitudinal
article is determined by the right hand edge ofv
folding mechanism;
_
the left hand part is rolled overv by the wing 30
20 upon a second riding plate 34, the forward edge
of the articles;
of which is supported by the upper face of the
One or more transverse folding devices G which
folding wing 3|. The folding line for the left
produce cross folds in the article; and
A collecting or stacking device H where .the
part of the article is determined by the left band
edge of the {plate 32 and as the folding operation
product of the machine is collected in orderly
piles ready to be removed.
25 proceeds the respective right and left folded parts
are separated from'each other and from the
All of the foregoing instrumentalities are more
middle part of the article by the riding plates
or less automatically controlled in manner and
by means to- be described.
’
32, 34.
1
The earlier portions 30b, 3"), of the folding
' one end of which (the left hand end in Fig. l) is 30 wings, where they are first engaged by the article,
are progressively more and more inclined to the
supported the feeding device E, and which also
horizontal plane, as shown in Fig. 3. This sim
supports the longitudinal folding apparatus‘ F,
rple elevation of these folding plates, out of the
the cross folding mechanism G, and the stacking
The machine shown embodies a frame it, at
mechanism H.
horizontal to an inclined position, accomplishes
the two folds with more certainty. The inclina
tion is in favor of the turning over or rolling
-
The feeding device
The feeding device E includes gonveying rib
bons Ii traveling over front and rear rolls l2,
l3, Figs. 1 and 7, with the top run moving toward
movement produced by the folding wings along
the outer edge portions of the right and left parts
of the article and materially assists their opera
the rear end of the machine or away from the 40
tion.
operator. These ribbons are driven by a sprocket
ll on the shaft II of one of the rolls connected
by a chain I. with a sprocket on a shaft i1 pro‘
.
Usually a portion of. the folding plates is en
closed by a cover plate 35 hinged at 33 to enable it
. to be readily lifted up when desired.
vided with a pulley i3 connected by belt i3 to a
To further assist in the longitudinal folding
pulley on the shaft of a suitable driving motor 20. 45 operation, and to establish and maintain proper
Roll shaft 2| has fixed thereto a-pair of smaller
folding lines, I preferably provide means for
rolls 22 which drive a set of ribbons 23 running
grooving the work as it proceeds. This means
over another roll 23 supported in suitable bearing
includes a pair of V-edged disks 31 mounted on
brackets at the feeding end of the machine, and
a shaft 33 carried by arms 33 ?xed to a shaft 40
roll 24 drives another pair of ribbons 25 running 50 supported on the bracket arms 33. Also fixed to
over an idle roller 23. The idlers 21 and 23, suit
shaft 43 is one end of a 'coil spring 53, the oppo-'
ably mounted, provide belt tightening means. On
account of thelarger size of rolls I2 with respect
to the rolls 22, the ribbons 33, 23 travel at a slower
site end of ' which engages with bracket 33. Thus
the disks are biased downwardly in a clockwise
direction, Fig. 4, to cause them to press the work
speed than the . ribbons H, thereby producing 55 into engagement with V-grooved lower rolls 4i,
spaces or ‘gaps between successive articles when
Figs. 1 and 6, lying beneath the work. The rollers
the feeding device formed by. the belts 23, 25
ll are supported on a shaft 42 carried by the
delivers the articles successively to the conveying
frame, said shaft also being provided with suit
'
ribbons Ii.
These conveying ribbons carry the -
able driving means, such as a sprocket 43 con
articles to and‘ through the longitudinal folding 60 _ nected by chain 44 to a sprocket 45 or roll shaft l2.
mechanism, and'thence to the cross folder, as will
‘With the foregoing arrangement, the grooved
later appear.
. Longitudinal folding mechanism _
_ The longitudinal folding mechanism F includes
two side wings 33, 3!. Figs. 3 and 5 illustrate how
these wings consist of metal sheets rolled or bent
upwardly and inwardly progressively, as illus
trated at 33a and 31a. As the article advances
with the conveying ribbons ii the outer edge 70
portion of itsright hand part (looking forward)
is rolled over by the right wing 3ia to lie upon
the middle part of the article and later its left
part is rolled over by the left wing 33a to be super
posed upon the already folded right part. To hold 75
rollers are driven along with the receiving belts
23, 25 and the conveyer belts ii, and intimed
relation with the travelling work. . The disks lie
close to and in line with the edges of the riding
plate 32 and with it determine the fold lines.
Their purpose‘is to pre-crease each article, along
the proper fold lines, just as it reaches the riding
‘plate and begins to be turned up by the inclined
portions 30b, Nb of the folding wings.» . The‘
rollers also assist, of course, in causing feeding
advance of the article.
'_ - First cross folding mechanism
Each article, when it. leaves the longitudinal
2,403,894
.
.
,
5
.
.
,6,
.
port pivotally, at 65, left and right stack sup
porting plates 06, 01 provided with inwardly. ex
folding mechanism, is subjected to one or more
cross folding operations. ' The ?rstcross fold is
produced'by cross folding mechanism shown in
tending ?ngers 66a, 01a, which extend into
detail in Figs. 7 and 8. It includes a folding blade I
notches in the side edges of the lifting plate 02,
as shown in Fig. 2.
7
51, lying in a vertical plane above the work and
Side brackets 64 also support shafts 00, 00,
arranged to engage each article at a preselected
Fig. 7, carrying pulleys' I60, III over which travel
point along the length thereof and move it down
round belts I02, the upper run of each of which
wardly and tuck it into engagement in the bite
extends slightly above the upper surface of the
between a pair of pinch rolls, one of which, I3,
supports the feeding belts II, and the other of 10 lifting plate 03, when the latter is in its lower po
sition, said lifting plate being slotted for the pur
which, 56, is supported in ?oating bearings 56,
pose, as shown at I02, Fig. 2.
Fig. 1, one at each end. Springs 60 bias roll 50 .
bite between these rolls it is carried through be
tween them and thus is cross folded, and the fold
ing blade then retires for another operation.
I
'
Any article delivered by the belts 12 to the.
: stacking device moves forward ~on top of the
toward roller I3.. When the article reaches the
15 stacking plate 96, in its lowermost'poeition, and
into contact with the belts I02 which advance
the article into the stacking device with its lead
ing edge engages a movable stop device I00, Figs.
7 and 10. The stack of finished articles is built
The folding blade 51 lies and moves in a verti
cal plane, being guided for vertical movement in
.a suitable frame 6|. Springs 62 bias it upwardly,
and it is moved downwardly by the armature 63 20 up by additions to one of its ends, here to its bot
tom, and the rising pile is guided and supported
of a solenoid 61, said armature being connected
by upstanding posts I05.
,
by links 65 to levers 60 pivoted at 64a to the frame
Suitable intermittently operating mechanism
and connected respectively to opposite portions
is provided for operating the stacking mecha
of the folding blade by links 66, 10. Downward
motion of the folding blade is limited by engage 25 nism, preferably in timed or synchronized rela
tion with the cross folding- devices before de
ment of a shoulder 63a on'the solenoid armature
scribed. As illustrated, the operating mechanism
with the solenoid housing, and a housing 1| is
provided to ‘enclose the mechanism.
,
When but a single cross fold in the article
includes a shaft I06 provided with a" two-lobed
rollers I3, 58, drops down to a curved conveying
lies beneath the lower end‘of, and elevates, the
plate 12 along which it slides to ribbons 13 which '
toward theend of the curved plate extend above
post 92 and the pusher plate 63 carried thereby.
On shaft I06 are mounted, for rotation together
it and beyond its end and which deliver the
or as a unit, a ratchet wheel III and a sprocket
cam I01 adapted to actuate one arm I100 of a
is desired, the article, when it leaves the folding 30 lever pivoted at I09, the other arm IIO of which
article to the belts of the stacking mechanism 35 II2, the latter connected byra driving chain Hi
to a small sprocket II4 on the main driving shaft
H, as will later appear.
I1, so that the unit I I I, II2 rotates continuously.
Second cross folding mechanism
On the same shaft I06, and pinned thereto, is
an operating member II5 having two_ arms di
While in some cases the articles may be suf
?ciently ?nished if cross folded but once, never 40 ametrically opposed, one of which carries a T
shaped latch lever ‘H6, while the other carries
theless the present machine is-arranged to pro
an L-shaped lever II1, arms of the two levers
vide a second cross fold when such is desired.
.being cross connected by a link H0, and the link
The mechanism for this purpose includes a
and lever system being biased by a tension
second folding blade 15 mounted on one arm 16
of a lever pivoted at 11, the other arm 18 of which 45 spring II9 to engage a tooth I20 of lever II6
with the teeth of ratchet III, such operation
is provided with a head 19 actuated by the ar
normally being prevented by an abutment I2I
mature 80 of a solenoid BI. [Sail folding blade
on a lever I22 pivoted at one end at I23, and at
is normally biased to retire by a spring 82. At
the appropriate preselected time, said folding
blade 15 moves forward, engages the article de
its opposite end connected to the armature I24
60 of an electromagnet I25.
pending beneath the rolls I3, 58 and held 'in the
One end of a latch
lever I26 normally lies behind a pin I21 on the
bite thereof, and advances the article into the ' arm II5, holding it in position with the upper
arm of lever II6 against'the abutment lug I2I,
bite between the roll 58 and another roll 83 sup
as shown in Fig. 11. Latch lever I26 is. biased
ported in the frame and lying beneath it. The
?oating bearings 59, as shown in Fig. l, are an 65 by a spring I20, which holds'it against a stop
I29. When the arm II5 rotates (turning clock
gularly disposed, so that the bias of spring 60
wise in Fig. 11) the pin I21 rides beneath the
upon roll 58 provides yielding pressure of said
lower edge of lever I26, lifts its right hand end
roll-against both of the rolls I3, 83. As shown
and passes beyond it, the lever dropping into
in Fig. 1, the shaft of roll 63 is provided at one
place into the position shown, ready for another
end with a sprocket 04, enabling it to be driven
operation.
by the same belt I6 which drives roll I3. Articles
The stacking mechanism operates ‘as follows:
subjected to a second cross folding operation be
In the normal position of rest of the parts,
tween rolls 58, 63 are delivered to a curved plate
shown in full lines Fig. 7, in Fig. 9 and in Fig.
85 along which they slide to the same belts 13
before referred to, which carry them into the 65 11, the stack of previously folded articles rests
upon the left and‘ right ?ngers 96a, 91a and the
stacking mechanism now to be described.
lifting plate 93 is at a lower level with the belts
Stacking mechanism
I02 extending slightly above it. A previously
folded article may be lying upon plate 62 if the
less in detail in Figs. 9 and 10. It is mounted 70 machine has been in continuous operation.v The
The stacking mechanism is illustrated more or >
upon a bracket 90, Fig. 1, attached to the ma
chine frame, I0. In bracket 90 is mounted a tu
parts are so timed, as will later appear, that
when the folding blade .51 is again depressed to
fold the next article, by energizing solenoid‘ 61,
solenoid I25 is also momentarily energized, thus
and to the upper end of which is a?ixed a lift
ing or pusher plate 939. Side brackets 60 sup 75 raising lever 922 and releasing the lever!" to
bular guide SI 'for a post 92 slidable vertically
2,408,894
the effect of its biasing spring II3.
8
Fig. 10, and causing the upper end of its other
Dog I20
arm I43 to move away from its position beneath
9. lug I44 on the back of the stop plate I44. Then
the leading edge of the next towel or other article
thereupon enters a recess of the ratchet wheel
III, coupling the member H5 to rotate with the
ratchet wheel and thus turn shaft I06 and the
two-lobed cam I31. Immediately upon release
of lever Ili solenoid I23 is deenergired, lever I22
fed into the stacking mechanism moves beyond
the lowered stop plate I04 until it engages a fixed
stop plate III4a. Therefore, one towel in each
drops and the lug I2I assumes its original posi
group of articles, corresponding to the number of
tion, ready to engage a trip arm of either trip
ratchet teeth in one-half the circumference of
IIS or III, when it next comes around, thus dis
engaging the dog I23 from the ratchet wheel 10 ratchet I33, extends beyond the face of the stack.
If the ratchet wheel has fifty teeth, for example,
and terminating the operation of the half rev
a short piece of every twenty-fifth towel projects
olution mechanism. During the one-half rev
beyond the face of the stack, so that the towels
olution of shaft I06, one of its cam lobes’swings
readily may be taken off in multiples of twenty
lever I08, III! and elevates post 32 and the lift
ing plate 33. Plate 33 carries up with it any 15 flve. The next time the stacking mechanism op
erates, an extension I43 on the lever arm Ill
article previously deposited upon it, adding it to
engages the lower end of stop I34, restoring it
the pile, and lifting the pile so that the lower
to its original position with its lug I44 above the
most fresh article reaches a position above the
lever arm I43.
lifting fingers. The lifting plate then moves
Of course, this arrangement always leaves the
down again to its original position, and imme 20
last towel, folded, in the stacking device below
diately receives the next article, which by the
the stack supporting plates, when the machine is
simultaneous energization of solenoid 61 has just
stopped. Accordingly I provide the mechanism
been folded by blade 51 and has then been de
livered to the stacker by one of the chutes ‘I2
. or 35.
Pivotal mounting of members 36, 91 per
with a rod I46, Fig. 1, connected at one end to
25 lever I22 and the other end extending to a con
venient upper position. By pulling up on this
rod the trip 'lever H6 or I" may be released and
the stacking mechanism caused to operate once
to clear it of the last folded article.
the same folding and stacking operations are re
Usually the mechanism is also provided with a
peated. Thus, operation of both the stacker and 30
totalizing counter. In the arrangement shown I
. the folding mechanism is initiated and goes on
provide such a counter of conventional form, in
simultaneously.
dicated at I", Fig. 10, the operating arm I43
With such an arrangement, where the article
thereof being connected by a link I43 to a lug on
is delivered to the lifting plate before the com
mits free upward movement of the articles, as
will be readily understood. When the two sole
noids 31, I25 are again energized simultaneously
plete cycle of operations is completed, and lies 35 ‘the auxiliary ?nger I34, so that this totalizing
there awaiting initiation of the next cycle by
counter will be actuated once for each actuation
energization of the solenoids, there is no likeli
of the stacking device and indicate and record
the number of towels folded, to check produc
tion of the mechanism.
hood of the lifting plate rising before the article
has fully entered the stacker. More certain op
eration is thereby secured. The articles are al 40
ways stacked properly and jamming of the ma
chine by improperly placed articles is prevented.
Counting mechanism
While not essential, the stacking mechanism
may be provided with counting mechanism con
structed and arranged to operate as follows:
General operation
Summarizing the operation of the mechanism
as a whole, described thus far, articles to be folded
are delivered in succession to the feeding belts
23, 25', either manually by an operator, or they
may be discharged upon the feeding belts from
a previous mechanism, such as the delivery belts
The counting mechanism is best illustrated in
of a ?atwork ironer. The feeding device car- Figs. 9 and 10. It includes an arm I33 mounted
to rotate freely on a stub shaft I3I. This arm 50 ries each article forward and delivers it to the
traveling belts II of the longitudinal folding
carries a pawl I32 yieldingly held in engagement
mechanism,
the side wings of which fold the side
with the teeth of a ratchet I33. An auxiliary
edges inwardly around the riding plates as the
?nger I34 is pivotally mounted on the pivot shaft
article moves along with the belts. When the
33 on which the right-hand stack supporting
article reaches the cross folding mechanism, in
plate member 31 is pivoted. This finger has con
cluding folding blades 51 and 15, it is engaged by
nected thereto a depending rod I35 sliding in a
oneof said blades, if one cross fold is desired, or
guide I36 and biased to the position shown in
in turn by both of said blades, when two cross
Fig. 10 by a compression spring I31. The lower
folds are desired, and is thus introduced to and
end of rod I35 lies Just above an end of the army
I33. Auxiliary ?nger I34 extends into the path 60 passes through the folding rollers, which deliver it
to one or the other of the plates ‘I2, 33 along
which it slides to the belts 13 which deliver it
into the stacking mechanism. There it is added
rived article and plate 33 move upwardly and turn
to the bottom of the pile being formed, is counted
plates 33, 31 about their pivots, auxiliary ?nger
I34 is also tilted, causing rod I35 to move down 65 with others, and the record of the count is in-'
dicated and recorded in the totalizer.
wardly and actuate arm I33, turning ratchet I33
and shaft I3I the distance of one tooth, to a new
Control mechanism
position, where it is held against return by a de
of vertical article movement in the same ‘manner
as ?ngers 31a. Therefore, when the newly ar
tent pawl I33.
'
>
3 Since, in the specific machine illustrated in
Ratchet wheel I33 has aiiixed thereto a bar
the drawings, the folding blades are actuated by
member I43, opposite‘ ends of which extend
electromagnets or solenoids and the operation of
slightly beyond the wheel periphery. During each
the stacking mechanism is controlled by another
electromagnet, the control system obviously is
of electric form. The circuits therefor are illus
half revolution of the wheel one end of ‘this bar
engages one arm “I of a latch member pivoted
on the shaft I42, rotating it counterclockwise in 75
trated in Fig. 14. together with conventional illus
2,403,894
10
?ngers'l and 2. Each constitutes a sensitive
electric relay responsive to passage of an article
trations of the machine parts- This Control SYS
tem is arranged and operates‘ as follows:
The control system shown permits several dis
tinct folding operations, which may be individual
past said contacts. As to these tubes, when their _
plate circuits become conductive, tube A ener
gizes a relay 20!, moving its armatures 205, 206
to their a positions, and tube B energizes a relay
ly selectively chosen by operation of the ganged
switch 200 shown in Fig. 15. The said switch 200
in the wiring diagram of Fig. 14 for convenience
has been shown with its several elements 20 I, 202
and 203 distributed in their proper places in the
various circuits but it should be understood that
in actual construction and operation all three of
said elements "I, 202 vand 203 are most con
veniently arranged for operation from a single
knob or control member.
201, moving its armatures 208, 208, 2I0 to their
a positions. The effect of such movements and
their corelation with the entire control operation
will soon appear.
As in my copending application referred to,
control of the operating solenoids 81 for the
folding blade 51, and 8| for the folding blade
‘I5, is dependent upon the total time for discharge
The various folding operations which may be 15 of one or more of capacitances 2II, 2I2, as
sociated with time delay relay valve C, and M3,
associated with time delay relay valve D.
Current for charging the capacitances and op
erating the electronic tubes and associated relays
is supplied from the secondaries 2H, 2I5, 2I6 of
a transformer generally designated 2I‘I, which
mid-point of the length of the article.
performed with this control system are as fol
lows, it being understood that in all cases the
article may vary in length between a preselected
maximum and ‘a preselected minimum:
1. A single transverse fold may be made at the 20
2. A' single transverse fold may be made at any
‘derives its power from a conventional voltage
control transformer 2I8. Secondary 2“ is pro
vided with a conventional voltage divider 2I9,
25 secondary 2I5 with a conventional voltage divider
selected for illustration and description.
220 and secondary 2I6 energizes the heater ?la
3. The article may be folded ?rst at its mid
ments of all four electronic tubes, intermediate
point, and then again at the mid-point of the
portions of the heating circuits being omitted for
new half length, thus accomplishing what we
simplicity.
'
will term the half and quarter type of multiple
Time delay relay C, when its plate circuit is
30
fold.
conductive, energizes a relay 2III, moving its
4. The article may be folded ?rst on a line
armature 220 to position a, while time delay
spaced one-third of its length from the trailing
relay valve D, when its plate circuit becomes con
edge, and ?nally on a line spaced one-third of
ductive, energizes a relay 2'“, moving its arma
its length from the original leading edge, thus ac
other point spaced from' the mid-point of the
' article, the one-third point being hereinafter
65 ture 222 to its a position.
complishing what we will term the one-third-two
third type of transverse fold.
The general type of electronic control here
illustrated, in its essential features, is similar
In the arrangement shown in said copending
application referred to, when it is desired to pro
duce a single cross fold in an article at any
point located upon it proportionately to its
pending application, Serial No. 436,465, herein 40 length, a charged capacitance, such as the capaci
tance 2“ in the cathode-grid circuit of dis
before referred to,.to which reference may be
charge valve C, is permitted to discharge at
had if desirable or necessary. Its essential fea
one rate when the leading edge of the article
tures will be here described only to an extent
engages trip 2 and until its trailing edge en
necessary for an understanding of the operation
gages trip I , whereupon its discharge is continued,
of the apparatus here shown.
but at an increased rate, until the discharge is
Of the three elements of switch 200, each has
to that illustrated and described in my said co
three positions, left, middle and right, designated
in the diagram by the reference letters L. M._ and
R.
In element 202 the L and M contacts are
connected by a bridge 202a.
The parts of the folding machine, including
the operating solenoids, shown in Fig. 14. require
no special description, because they correspond
to or'are the same parts illustrated in Fig. 1,
complete, whereupon the operating solenoid 61
is energized and the cross fold is produced. In
such case tube D, controlling the production of
a second fold, is made inoperative or ineffective
by opening a manually operated normally closed
switch 8Ia. The present control system is ar
ranged to perform a one fold operation here
precisely in the same manner as in said co
although it should be noted that the two views 55 pending application. Again, in said copending
application, the one-half-one-quarter type fold
are reversed, with the work moving from left to
is produced by the use of time, delay relays C,
right in Fig. l and from right to left in Fig.
D and associated capacitances, such as 2| I, 2I3,
14. In Fig. 14 the work travelling with the
with the rates of discharge of the capacitances
conveyor belts II engages in succession two trip
?ngers, marked I, 2, and while in contact there 60 2| I, 2I3 varied during the time delay period in
such maner that tube 0 energizes solenoid 61
with interrupts a circuit from thetrip ?nger to
to produce a fold at the mid-point and tube D
an insulated conducting riding plate 32 to be
energizes the solenoid 8| to produce a fold at
referred to.
'
the quarter point. The completely folded article,
As in my copending application, the electric
control system includes four electronic discharge 65 as it is delivered to the curved 'plate 85 lies
upon it with the leading and trailing edges of
valves marked respectively A, B, C, D. These
the article superposed upon each other and lying
valves are used as control devices by variation
above the cross fold at the mid-point. Again,
of the potential in the grid circuit to adjust it
the present control system performs that oper
to or beyond the critical control value, thereby
making the plate circuit conductive or noncon 70 ation in exactly the same manner and ‘by the
same means as in said copending application.
ductive, as the case may be, and thus producing
As to the production of two cross folds at the
a delayed controlling effect in or by the plate
circuit.
v
,
Electronic tubes or valves A and B are re
spectively in operative conjunction with the trip
one-third and two-thirds points, however, the
present control system is arranged to operate
differently from that of the said copending ap
2,408,894
11
12
plication, in that the time delay which deter!
mines the location of the second fold, controlled
by the discharge of capacitance 2I2, is completed
energized; its armature 220 is in its b position
and the circuit by way of conductors 3“, 2|! to
and through the operating solenoids 61, I2! is
at a single unvarying rate and is not variable by
open.
increments during different portions of the dis
charge, and therefore depends entirely upon the
total initial charge given to capacitance H3 in
At valve D, the capacitance 213 alone is in cir
cult, but it is not charged, and its charging cir
.
cult is open, to be closed later, as will appear.
Its plate circuit is conductive, relay MI is ener
giled and armature 222 is in its a position, so
sipated at two different rates.
‘
10 that the circuit to operating solenoid 8| by way
One-third-twO-thirds multiple fold
of conductors 3I6. 3I5 is closed and the folding
blade ‘I! is in its advanced position. But this is
For convenience the operation will ?rst be de
immaterial, as will also later appear.
scribed with' reference to the production in an
Let us assume, now, that an article to be car
article already folded longitudinally in the longi
tudinal folding device F of two cross folds, the 15 ried by the belt conveyor II, advances in the
machine until its leading edge engages trip ?nger
?rst produced by blade 51 at a point located one
I. This opens the biasing circuit before described
third of the total length of the article from its
for valve A, its relay 204 is deenergized, and ar
trailing edge and the second, produced by blade
matures 205, 208 move to their b position. Noth
15 at a point located one-third of the length of.
the article from its leading edge or two-thirds of 20 ing else happens.
The leading edge of the article next engages
its length from its trailing edge.
trip finger 2, and because in this apparatus the
To that end switch‘ 200 is turned to its R posi
two trip‘flngers I, 2 are spaced apart the length
tion and manual switch Ila is closed, as illus
of the minimum length article to be folded in
trated in Fig. 14.
It is assumed that lead wires L1, L: are con 25 the machine, both trip ?ngers will be engaged by
stead of the manner in which that charge is dis
relay 2“ is deenergiz‘ed and its armatures 205,
the article simultaneously. When the trip ?nger
2 is engaged, the overbiasing circuit for the grid
of valve B, before described, is also opened, its
plate circuit becomes conductive, relay 201 is
the voltage divider 220, conductor "6 and through
‘ tion, conductor SIB, armature 2I0 in its a position,
nected to a source of current and that the cir
cuits are all energized.
The plate circuit of valve A is nonconductive;
206 are in their b positions, because the grid 30 energized, and its armatures 208, 209, 2“! move
to their a positions. Two effects are produced, as
circuit of said valve is subjected to overbias and
follows:
the grid potential is above the critical control
A charging circuit is established for the ca
value. The biasing circuit is as follows: from
pacitance 2I3 of valve D, as follows: from the
the grid of valve A, through resistance 31“, con
ductor 302, trip ?nger Linsulated conducting 35 lower plate of said capacitance by way of con
ductor III, the arm of switch 2M in its R posi
riding plate 32, conductor 303, resistance "4 at
the cathode back to the grid of valve A.
Likewise, the plate circuit of valve B is non
conductive; relay 2'" is deenergized and its arma
tures 208, 209, 2III are in their b positions, be
cause the grid circuit of this tube is overbiased
and its potential is above the critical control
value. The circuit is as follows: from the grid
of valve B by way of resistance 201, conductor
conductor IIO, voltage divider 2| 9 to the point
2I2, conductor 305, conductor 320, and by way
of the cathode-grid circuit of valve D back to
the upper plate of capacitance 2I3. Said capaci
tance charges instantaneously and imposes over
bias on the grid circuit, raising its potential above
the critical control value. Consequently, the
plate circuit of valve D becomes nonconductive,
398, trip ?nger 2, insulated conducting riding
relay 22I is deenergized, armature 222 moves to
plate 32, and by way of conductors 203, resist
ance 3M, conductor 305 and conductor 30!
and through the cathode back to the grid of
its b position, and the circuit to the operating
solenoid ll opens and folding blade 15 retires
ready for operating advance.
valve B.
At valve C the switch element 203 is in its R
position and the two capacitances 2II, 2I2 are
included in the circuits in parallel, so that they
Also, .a discharging circuit is completed for the
capacitances 2 I I, 2I2 of valve C, as follows: from
the lower‘plates of capacitance 2I2 by way of
the arm of switch 202, and from the lower plates
of capacitance 2“ by way of conductors 32I to
act as one. These capacitances have been se
lected or chosen of such size that the total charge
thepoint I22, thence by way of conductor III),
as will appear.
armature 208 in its a position, conductor I23,
resistance 324, resistance 325, resistance 226, ar
mature 205 in its a position, and conductor 321
to the upper plates of said capacitances. Dis
charge of said capacitances continues at a rate
dependent upon the total value of resistances 224,
I2! and 12!, all of which arein circuit with the
capacitances. The rateof discharge is conse
These two condensers are charged by a circuit
as follows: from the lower plates of said con
quently low. As discharge continues the poten
tial of the grid circuit of valve C approaches the
they will accept, when dissipated in the manner
to be described, will produce such time delay as
will cause the first folding blade 51 to be oper
ated when a point located on the article one-third
of its total length from its trailing edge registers
with the folding blade, regardless of the actual
length of the article, within reasonable limits,
critical control value. This effect continues until
the trailing edge of the article passes trip finger
I, a period of time obviously dependent upon the
total length of the article (whatever that may be
and grid circuit of valve C and conductor 321 70 between the preselected minimum and maxi
to the upper plates of the condensers. As the
mum) reduced by the constant distance separat
result of the inclusion ,of said capacitances in
ing the trip ?ngers I and 2. When the trailing
the cathode-grid circuit the grid potential of this
edge of the article passes trip ?nger I, the latter
valve also is above the critical control value, its
again engages the conducting riding plate 32, re
densers by way of conductor 3", armature 2.8
in its b position, conductor 3| I, voltage divider
220, secondary 2I5 to the point 2I2, conductor
305, conductor 3I2, and by way of the cathode
plate circuit is nonconductive; relay 2|! is de
establishing the overbiasing circuit for valve A.
2,403,394
13
14
,
leading edge. In that case the second fold is
produced while both parts of the double thick_
tive, deenergizing relay 2“, so that armatures
ness portion of the article moving into position
2.3, 203 move to their b positions. The move
for the second fold are still supported by rolls I3,
mentv of armature 205 shorts out the two resist
58, and the original ?rst third of the article will
ances 323, 326 by way of conductor 328 and the
not drop down for lack of support.
arm of switch 202 in its R position. As the re
All of the foregoing is merely a matter of pre
sult, discharge of the capacitances 2! I, 2l2 pro
determination of the exact point where folds
ceeds, but at a higher rate, the value of resistances
are desired and the selection of appropriate values
324, 323, 326 being so selected that when the ca
of capacity and resistance, and the determina
pacitances 2“, 2|: have been completely dis
tion of whether‘ time delay is necessary or not
charged by increments, ?rst at a low rate and
in the production of the second fold, according
second at a higher rate, the appropriate point on
to the preselected location of the trip device for
the article, one-third of its length from the trail
controlling it.
ing edge, registers with folding blade 51. At this
In the present arrangement initiation of dis
instant the potential of the grid circuit of valve 15
charge of capacity 2l3, which controls the second
C reaches the critical control value, its plate
fold and which was charged instantaneously
circuit becomes conductive, relay 2 l 9 is energized,
when both trip ?ngers I, 2 were interrupted by
armature 220 moved to its a position and the cir
the article, begins when the trailing edge Passes
cuit through wires 3“, 3|! to operating solenoid
trip ?nger 2. The discharging circuit for capaci
I1 is closed, producing advance of the folding
tance H3 is as follows: from the lower plates of
blade 31 to tuck the article between the ?rst fold
capacitance 2i3 by way of conductor 3", arm of
ing rolls I3, 53, for the production of the ?rst
whose plate circuit again becomes nonconduc;
switch 20! in its 1' position, conductor 318, arma
ture 2H) now in its b position, conductor 329, re
sistance 330, conductor 33l and conductor 332 to
the upper plates of said capacitance. As soon
as the capacitance H3 is fully discharged, the
cross fold.
The trailing one-third of the length of the
article never moves horizontally beyond the ?rst
folding blade 31, but follows a path horizontally
to the left in Fig. 14 to the folding blade and
thence down through the bite between the folding
trailing edge of the article has registered with
the folding blade 15, and at that moment the
rolls i3, 53. Consequently, no matter what is the
actual length of the article (variable as it is be 30 potential of the grid circuit of valve D reaches the
critical control value, its plate circuit becomes :
_ tween the preselected minimum and maximum),
conductive, relay 22l is energized, armature 222
moves to its a position, and the circuit through
conductors 3 l5, M6 to the operating solenoid BI is
the trailing edge always moves exactly the same
distance from trip ?nger 2 to a position in registry
with the second folding blade 15, and it will be
observed that when producing a one-third-two
35 energized, causing the folding blade 15 to advance
thirds fold, the second fold must be produced
and introduce the article between the second
when the trailing edge of the article is in said
pair of folding rolls 58, 33 for the production of
the second cross fold.
position, in registry with the folding blade 15.
The folding blade 15 remains in its advanced
As the result, the time delay period for the second
folding operation may begin when the trailing 40 position until the next article to be folded. en
gages trip 2 and recompletes the charging cir
"edge passes any predetermined point along the
cuits for capacitance 2|3 before described.
path of motion, such as either at the trip ?nger
In considering the circuits effective for produc
' l or the trip ?nger 2 or any other point, and end
ing the ?rst and second folds in the one-third
when the trailing edge reaches the second folding
point. That time delay readily may be deter 45 two-thirds type of fold,~ it will also be observed
that simultaneously with energization of operat
mined by the amount of charge initially given
ing solenoid for producing the ?rst fold, the op
to the capacitance 213, as determined by the
erating solenoid I25 which trips the latch mecha
voltage divider in its charging circuit, and the
nism controlling the lifting plate 93 also is ener
value of the resistance through which that charge
is permitted to be dissipated. 4
50 gized.
No actual time delay is really necessary for the
production of the second fold at the proper place
according to the method now being described,
because the trip device may be located in registry
with the second folding device, so as to cause the 55
The result is that each time a ?rst cross
folding operation is initiated at the folding rolls
[3, 58 a complete cycle of operations of the lift
ing plate 93 is initiated and‘proceeds to com
pletion, as before described.
One-half-one-quarter fold I
production of the second fold simultaneously with
actuation of the trip device which controls it.
The same control mechanism shown in Fig. 14
For example, if the ?rst fold is produced at a
is usable for the production of the one-half
point located one-third of the length of the ar
one-quarter type of fold, by leaving switch Ola
ticle from its trailing edge, that part of the article 60 in its closed position and moving switch 200 to
which passes down through rolls I3, 58, is of
its intermediate position M. Description of this
double thickness and the second fold is produced
variation may be simpli?ed without the necessity
as the original leading edge of the article reg
of retracing all circuits completely, as follows:
isters with folding blade 15. So, if the trip de
In this case the arm of switch 203 is on a blank
vice for the second fold is located in registry with 65 contact, so that capacitance 2l2 is entirely
folding blade 15, it may be sensitive to the thick
omitted from the circuits. Capacitance 2“ is
used for producing the half fold, and capacitance
ness of the article, instead of to its mere presence,
being actuated as the original leading edge (now
2| 3 for producing the quarter fold. The arm of
the trailing edge of the double thickness portion
switch 202, also in its intermediate position M,
70 by bridge 202a and conductor 333 shorts out the
of the 'article) passes the trip device.
Also, by appropriate adjustment, the second
resistor ‘326, when that is necessary. The arm
of switch 20 l , in a similar position, includes arma
fold may be produced at a point located approxi
mately one-third of the length of the article from
ture 205 in the circuit by way of conductor 334.
its trailing edge, and also a short distance, say
The two condensers 2“, H3, are charged when
an inch or a fraction thereof, short of its original 75 the trips I and 2 are in contactv with the conduct
2,403,894
.
15
.
_
l6
.
said charging circuit. The result is that. during
all operations of the system with the switch 200
ing plate 32. The charging circuit for condenser
2“ is from its lower plate through conductors
32!, Ill, armature 200 in b position, conductor
in its L position, the capacitance 2l3 remains _
fully charged, imposing extra bias upon the grid
conductor 30!, conductor 3", cathode and grid of I 01 circuit of valve D, rendering its plate circuit non
conductive and its relay 2_2l deenergized, so that
tube C to the upper plate of condenser 2i I. The
armature 222 is in its 21 position and the circuit
charging circuit for condenser 2" is from its
to conductor 3l0 for the operating solenoid 8|
lower plate through conductor 3H to the switch
remains permanently open.
20!, from the center point M of said switch
3| I, potentiometer 220, secondary 2ll, point 312,
through conductor 330, armature 200 in b posi 10
tion, conductor 3 l 3, potentiometer 2 I 3, secondary
2“, point 312, conductor 300, conductor 320,
cathode and grid of tube D to the upper plate of
the condenser.
Values of resistances and capacities
Of course, it should be understood that the
theory of operation underlying the controlling
circuits described herein is the same as that in
When the moving article intercepts both trips 15 my copending application before referred to.
I and 2, both of the condensers 2“, H3 begin
Both resistances and capacities are chosen of ap
to discharge. Condenser 2H discharges through
propriate sizes and values to perform their re
conductors 32! and 3! 0, armature 203 in a posi
tion, conductor 323, resistors 324, 325 and 320,
This is either a matter of
mathematical calculation or, in the case of ca
‘ spective functions.
armature 200 in a position, conductor 32‘! back 20 pacities, by adjusting the charge initially im
to the condenser. Condenser 2" begins to dis
posed upon each capacity, for later dissipation
charge through conductor 3", switch 20l, con
by increments at different rates or all at a single
. ductor 334, armature 203 in a position, resistors
rate, by adjustment of one or the other of voltage
330 and 331, conductor 330, armature 206 in a
dividers H3, 220 to the proper position. By such
position, conductor 332 back to condenser 2l3. 25 calculations and adjustments the system can be
When the trailing edge of the article passes
made not only to produce folds at the mid-point
trip 1, relay 200 is deenergized and the armatures
alone, or of the one-half-one-quarter type or of
205 and 200 drop to b position. These respec
the one-third-two-thirds type, but at any inter
tively short out resistors 326 and 331. The
mediate points located upon articles varying in
balance of the charge in condenser 2“ now dis— 30 length between a preselected minimum length and
charges through resistors 32! and 325, conductor
333, switch 202 and armature 205 in b position,
completing the timing for the half fold, and that
operation is performed. At the same time the
a preselected maximum length in proportion ac
extreme left position the switch elements 202,
203 are substantially unaffected, because the L
and M contacts of switch 202 are bridged,land
controlling means sensitive to movement of an
cording to the total length of each article. At
the same time, the control mechanism not only
times the production of the folds by variation in
balance of the charge in condenser 213 is being 35 one or two time delay periods, but it also syn
discharged through resistor 330, conductor 333,
chronizes with the production of folds in the sev
and armature 200 in 12 position. When this dis
eral articles the operation of the lifting plate of
charge is completed the quarter fold operation
the stacking mechanism, in such manner as to
is performed.
provide plenty of time for each advancing article
When the trailing edge of the article passes 40 to be entirely received in the stacking mechanism
trip 2 both condensers are again recharged for
prior to the elevation of its lifting plate.v
the next operation, which proceeds as before when
Other advantages of the invention will be ap
another article engages the trips.
parent to those skilled in the art.
What I claim is:
Single cross fold at mid-point
1. A machine of the character described, in
cluding means for moving flat articles to be folded
The same circuits just described for use in pro
along a path, a reciprocating cross folding de
ducing the half-quarter type of fold may be made
vice located adjacent said path and having ad
effective for producing a single cross fold at the
vance folding and retiring movements, stacking
mid-point by simply opening the switch am in
the circuit to the second operating solenoid 0| 50 means arranged to stack the folded articles by
additions to the bottom of the stack and in-,
for folding blade 15, as a consequence of which
cluding a reciprocating lifting plate having ad
it is impossible to produceoperation of the second
vance stacking and retiring movements, means.
folding blade. However, in the system shown in
for delivering folded articles from the folding de
Fig. 14 the arm of switch 20l accomplishes the
vice into position resting upon the lifting plate,
same purpose. If the switch 200 is moved to its
article along said path, and operating means for
the cross folding device and lifting plate‘ having
an operating connection to said controlling means
each of the L and M contacts ofswitch 203- is a
blank contact. The arm of switch 201, however, 60 controlled thereby and so timed with'reference to
the folding device delivering means and lifting
is moved to its contact L and introduces a con
plate as to simultaneously initiate the advance
ductor 300, into the circuit, the operation of which
folding movement of the folding device and the
is as follows: when the circuits are closed and
the system made operative, a charging circuit is
advance stacking movement of the lifting plate,
immediately set up for capacitance 2l3_as fol
whereby one folded article is lifted and added to
lows: .from'the lower plates of said capacitance
the stack at the same time a following article is
folded.
by conductor 3" to the arm of switch 20!, by,
conductor 30 to the voltage divider 2l3, thence
2. A machine of the character described, in
4 to the point "2 and by way of conductors 305 and
cluding means for moving ?at articles to be folded
320 and the cathode~grid circuit of valve D to
along a path, a reciprocating cross folding de
the upper plates of the capacitance. This charg
vice located adjacent said path and having ad
ing circuit, it will be observed, does not include
vance folding and retiring movements, stacking
any of the armatures of the relays 204 or 201-,
means arranged to stack the folded articles by
so that contact of an article with either or both
additions to the bottom of the stack and includ
of the trip fingers I, 2, produces no effect upon
75 ing a. reciprocating lifting plate having advance
2,403,394
-
17
stacking and retiring movements, means for de-.
livering folded articles from the folding device
into position resting upon the lifting plate, con
trolling means sensitive to movement of an arti
cle along said path, and operating means for
the cross. folding device and lifting plate having
18
vance stacking and retiring movements, means
for delivering folded articles from the folding
device into position resting upon the lifting plate,
controlling means sensitive ‘to movement of an
article along said path, operating means for the
cross folding device controlled thereby, actuating
mechanism for the lifting plate including a trig
ger device, means operatively connected to said
an operating connection to said controlling means
controlled thereby and s0 timed with reference
controlling means for actuating said trigger de
to the folding device, delivering means and lift
ing plate as to simultaneously initiate the ad 10 vice, said operating means and actuating mech
anism being so constructed and so associated with
vance folding movement of the folding device and
said controlling means that when operated they
the advance stacking movement of the lifting
simultaneously initiate advance folding move
plate, whereby one folded article is lifted and
ment of the folding device and advance stacking
added ‘to the stack at the same time a following
article is folded, said lifting plate operating 15 movement of the lifting plate, whereby one folded
article is lifted and added to the stack at the
means being also so constructed and timed with
reference to the folding device and delivering - same time a following. article is folded, and man
ually operated means also connected to said trig
, means as to complete the retiring movement of
ger device and extending to the outside of the
the lifting plate before the succeeding folded arti
to a position convenient for access by
cle is delivered to it.
.
20 machine
the operator, whereby the operator at will can
3. A machine of the character described, in
cause actuation of the lifting plate without op
eluding means for moving ?at articles to be folded
eration of the folding device, for the purpose of
along a path, a reciprocating cross folding de
advancing to stack position in the stacking means
vice located adjacent said path and having ad
vance folding and retiring movements, stacking
means arranged to stack the folded articles by
additions to the bottom of the stack and in
cluding a reciprocating lifting plate having ad
an article which otherwise might remain un
stacked therein.
_
JOHN E. PRESTON.
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