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Патент USA US3088392

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May 7, 1963
R. WINKLER ETAL
3,088,382
FLAP FOLDING APPARATUS
Filed July 1, 1959
2 Sheets-Sheet 1
a
EIIIA'II’T-IIIIIIA
4
INVENTOR
K/c/Iara’ Mmf/zr and
Karl" ?an/16616;"
BY
_
A TTOP/VEY
May 7, 1963
R. WINKLER ETAL
3,088,382
FLAP FOLDING APPARATUS
Filed July 1, 1959
2 Sheets-Sheet 2
'
INVENTOR.
Ric/lard M'?k/erj and
Kari" Dunneéxer
BY
MZMWéu
ATTOE/VEY
United States Patent O? ice
1
>
3&88382
‘ Patented May 7., 1963
2
3,088,382
FLAP FOLDING APPARATUS
Richard Winkier, Rengsdorf, near Neuwied, and Kurt
Dunnebier, Wollendorf, near Neuwied, Germany, as
signors to Berkley Machine Company, Kansas City,
Mo., a corporation of Missouri
Filed July 1, 1959, Ser. No. 824,279
4 Claims. (Cl. 93-62)
Referring more in detail to the drawings:
1 designates a bottom and closure ?ap folding mech
anism embodying the features of the present invention
and which forms a part of a complete envelope making
machine.
The envelope blanks a are delivered to the
mechanism '1 with sealing gum 11 applied to the closure
?ap c and the side ?aps d and e folded inwardly over
the body portion 1‘ and provided with stripes of adhesive
This invention relates to rotary envelope making ma
chines, and more particularly to a mechanism thereof for
folding the bottom and closure ?ap portions of envelope
blanks during processing of the blanks into envelopes.
g and h thereon, the blanks being advanced with the
bottom ?aps i leading and the closure ?aps trailing, as
shown in FIG. 2. In order to simplify the illustrations,
only those portions of the envelope making machine
which pertain to feed of the blanks into the mechanism
The principal object of the invention is to provide a
of the present invention are illustrated in the drawings.
folding mechanism which simpli?es the folding opera 15 These are feed rollers 2 and 3, a horizontal support 4,
tions of the bottom and closure ?aps, promotes greater
and a roller 5 by which the gum stripes g and h are
speed and accuracy, and which results in a more com
applied to the previously folded side ?aps d and e.
pact and shorter envelope making machine.
The mechanism ‘1 which forms the present invention
Other objects of the invention are to provide a fold
includes complementary rollers 6 and 7 to continue ad
ing mechanism equipped with passes for manipulating 20 vance of the blanks, which guide the blanks therebe
the envelope blanks to utilize suction and pressure rollers
tween at a substantially ?at angle to carry the bottom
for effecting folds of both the bottom and closure'?aps,
?ap portions i over a guide roller 8 and onto an inclined
and to provide improved means for separately removing
ramp 9 that de?ects the bottom ?ap i of the envelope
‘and conveying the envelopes from the machine.
.to partially break upon the score line j, as best shown in
In accomplishing these and other objects of the inven 25 FIGS. 1 and 4. The bottom roller 7 has spaced apart
tion as hereinafter pointed out, we have provided im
sections 10 and 11 interconnected at one diametrical side
proved structure, the preferred form of which is illus
by a segment portion 12 having an arcuate face 13
trated in the accompanying drawings, wherein:
FIG. l is a longitudinal section of a bottom and closure
registering with the peripheral faces 1-4 of the sections
10 and 11. The portion 12 connects the adjacent ends
?ap folding mechanism embodying the features of the
30 .of the sections 10 and 11 and has a shape to provide a
present invention, and which is adapted to form a part of
slot 15 that extends from the forward edge 16 of the
arcuate face portion 13 around the roller to the trailing
edge 17 and through which a jet of air is discharged
from a nozzle 18 to assist in de?ecting the bottom ?ap
a complete envelope making machine.
FIG. 2 is a fragmentary plan view of a ?rst suction
roller for initiating feed of the envelope blanks from
the side ?ap folding and gumming section of the machine
and delivering the blanks to the closure and bottom ?ap
folding mechanism of the present invention.
FIG. 3 is a similar plan view of the suction roller which
i of the blank upwardly over the roller 8'. The roller
6 constitutes a pressure roller having peripheral portions
19 for contacting the blank in offset relation with the
gum stripes g and h to cooperate with the roller 7 in
cooperates with a pressure roller of the mechanism to
feeding the blanks therebetween.
crease the fold of the bottom ?ap, and which seizes the 40
The roller 7, in line with the arcuate face portion 13,
closure flap to carry the blank into contact with a second
is provided with a longitudinal series of oblong holes or
pressure roller for creasing and folding the closure ?ap.
suction ports 20.
The roller 7 is timed so that the line
FIG. 4 is a fragmentary section through the ?rst suc
tion and pressure rollers and a portion of the pass into
of ports engage the body f of the blank along the trailing
45 side of the score j to seize the body portion J‘ of the blank
which the bottom ?ap is passed while the suction is carry
and grip the body of the blank thereto as the bottom ?ap
ing the blank into position under a guide roller for turn
ing the bottom ?ap over the body portion of the blank.
i is de?ected up the ramp 9. The suction is effective
on the body of the blank to carry the seized portion of
FIG. 5 is a similar section of the rollers shown in FIG.
the body portion 7‘ of the blank therewith and under the
4, with the blank being fed between pressure and suction 50 roller 8, which cooperates with the peripheral face por
tions of the roller 7 in bending the bottom ?ap on the
rollers for completing the crease of the bottom foldj
score j as the suction roller carries the body of the blank
- ‘FIG. 6 is a similar section through the roller mech
around the periphery thereof and into contact with the
anism shown in FIG. 5, with the addition of the pass for
under side of the roller 8. The grip of the rollers 7 and
receiving the partially folded blank, and the pressure
roller which cooperates with the suction rollerv in fold 55 8 on the blank is now su?‘icient to continue the feed
thereof, and the suction through the ports 20* is sus
ing the closure ?ap.
7
pended so that the feed of the blank can continue upon
FIG. 7 is a section similar to FIG. 6, but showing the
a substantially horizontal guide 21 as the bottom ?ap
envelope de?ected into vthe ?nal pass and the vacuum
is withdrawn from the ramp and laid over the inturned
roller in position to seize the closure ?ap.
side ?aps d and e. The roller 7 is preferably adjustable
FIG. 8 is a similar section, but showing the fold being
to position the suction ports circumferentially to set the
made in the closure ?ap while the blank is being with
most favorable position thereof in producing the bend
drawn from the ?nal pass and carried between the suction
along the score j and assure that the bend enters the
roller and the cooperating pressure roller.
pass between the rollers 7 and 8. In order to avoid
FIG. 9, is a similar section showing the envelope blank
double creasing of the fold th-us produced, the roller 8
after the fold of the closure ?ap is completed and the 65 preferably has only the function of receiving and folding
blank is being delivered to the discharge mechanism of
the bottom ?ap i without pressing it against the adhesive
the apparatus.
on the side ?aps. Therefore, there is always a space
FIG. 10 is a fragmentary perspective view to better
maintained between the roller 8 and suction roller 7
illustrate the pushing ?ngers, the rock shaft, the rocker
according to the paper thickness, which may be about
arm, and the cam which actuates the arm of the rock
.2 mm. with thin papers and up to .5 mm. with thick
shaft.
'
‘
'
i
‘papers.
3,088,382
4
3
The ‘feed of the blank continues across the guide 21
and the fold is passed between a pair of pressing rollers
22 and 23, which crease the fold and press the bottom
?ap into positive sealing contact with the adhesive on the
side ?aps. The blank continues between the rollers 22
‘and 23 into a pocket 24 which is formed between up
bottom ?ap being de?ected by the guide roller 8 onto
the ramp-9. As soon as the suction ports 20 come into
contact with the trailing side of the score 1‘, the suction
is made effective to seize the body f of the blank along
the score i, as shown in FIG. 2. Continued movement
of the rollers 6 and 7 then cause the body portion to be
wardly sloping slats 25 and superimposed guides 26.
carried downwardly with ‘the periphery of the sections
tion ports 27.
It is to be understood that with the roller arrangement
previously described, the roller38' has only a secondary
function as‘a conveyor means, depending upon the rough
downward buckle in the blank, which results in a fold
along the score 1'. As above stated, the contact point
10 and 11 of the roller 7 and under the guide roller 8,
The roller 22 may be an ordinary covered pressure roller
while the bottom ?ap portion is drawn from around the
having a resilient covering, but the roller 23 is a vacuum
roller and is provided with a longitudinal series of suc 10 guide roller 8 to the underside thereof for forming a
ness of the paper stock from which the envelopes are
formed, and the blank is advanced substantially freely
between the rollers 7 and 8 over the entire path until the
of the rollers 6 and 7 continue advance of the blank
across theguide substantially without aid of the guide
roller 8 until the bottom fold is in position to be en
gaged by the creasing rollers 22 and 23. During this
movement, the guide roller 8, being spaced from the pe
riphery of the feed roller ‘7, permits the blank to pass
‘thereunder without pressing the bottom flap 1' against
fold formed by the score 1' engages the bight between
the rollers 22 and 23. It is, therefore, clear that the
blanks, measured from the fold line of the bottom ?ap i 20 the gum stripes g and 'h, and so that the gum, instead
‘of being squeezed out from under the bottom ?ap, has
to the end of the closure ?ap c, must be at leastas long
time to be sut?ciently absorbed into the paper while an
as the development of the track between the rollers 6—7
envelope is being advanced across the guide 21. As soon
and 22r—'23. Attention is also directed to the fact that
as the fold engages the creasing rollers 22 and 23, the
the diameter of the roller 7 is a selected standard cor
responding with a working cycle of the envelope making 25 closure ?ap passes from between the feed rollers 6 and
7, whereupon’ the creasing rollers take over to continue
machine, and that the diameter of the roller 23 is one
advance of the blank, creasing the fold, and pressing
third the diameter of the roller 7, and is, therefore, op
.the bottom ?ap into sealing contact with the gum on the
erated three times as fast as the roller 7. This necessi
side ?aps. In this way, the gum has sufficiently pene
tates suction through the ports 27 on each-third revolu
tion to correspond with the working cycle, and this is 30 trated into the ?bers to make a solid seal before the
‘bottom ?ap is creased and pressed to the side ?aps. The
effected as disclosed in our copending application Serial
folded edge, after passing the creasing rollers, makes con
No. 824,282, ?led even date herewith. The suction is
tact with the ramp 25 and passes upwardly into the pocket
timed so that it is effective immediately after the score k
‘24 until the fold engages the ?ngers 29. At this time
of the closure ?ap 0 passes the ports 27 (FIG. 3), where
by the sealing ?ap c is seized and carried about the pe 35 the suction ports of the lower creasing roller engage the
sealing ?ap on the trailing side of the score k, where
riphery of the suction roller 23 to a pressure roller 28.
upon the suction becomes effective to seize the closure
Oscillatory pushing ?ngers 29 stop movement of the
flap and carry the closure ?ap downwardly toward the
blank into the pocket and act to reverse the direction of‘
bight between the lower creasing roller and the pres
the feed, that is, to initiate a reverse thrust on the lead
ing edge which cooperates with the suction grip of the 40 sure roller 28. During the start of this movement, the
roller 23 to buckle the blank downwardly so that the
blank bends on the score k to start folding and creasing
of the sealing ?ap as the fold passes between the rollers
?ngers 29 are actuated to exert thrust on the folded edge
of the blank, so that these opposed forces start the fold
on the score k, and as the fold is carried into contact
with the pressure roller 28, the portion of the blank
23 and 28. From‘the rollers 23 and 28, the ?nished
envelopes pass over a guide 30 between the spirals 31 45 in the pocket 24 is withdrawn therefrom and fed down
wardly between the pressure roller 28 and the creasing
of a conveying-means 32, whereby the envelopes are
‘roller‘27 into contact with the vertical guide 30, where
pushed to the delivery table (not shown).
upon the completed envelope passes into the spiral con
The ?ngers 29 are carried on a rock shaft 33 having
veyor which stacks envelopes on the delivery table in ac
a rocker ‘arm 34 on one end thereof (FIGS. 1 and 10).
The rocker arm carries a roller 35 rotatable thereon and 50 cordance with the usual practice.
From the foregoing, it is obvious that we have provided
in contact with the periphery of a cam 36, having ‘a
a mechanism which is substantially compact and which
‘recess or notch 36'. The rocker arm is connected to a
effectively folds the bottom and closure ?aps in a rela
spring 37 that holds the roller in contact with the cam.
tively short travel of the blanks.
The entire unit, including the rock shaft 33, cam 36 and
What we claim and desire to secure by Letters Patent is:
spring 37 is carried onta rack 38 which is adjustable 55
1. A bottom ?ap folding mechanism for an envelope
upon the frame of the machine to adjust the position of
making machine in which the envelope blanks are deliv
the ?ngers 29. The unit is adjusted on the frame by a
ered to the folding mechanism with side ?aps folded and
pini0n‘39 meshing with the teeth of the rack.
gummed and with the bottom ?aps leading, said folding
In order to hold the portions of the blanks which are
under withdrawal from the ramp 9 and pocket 24 from 60 mechanism including upper and lower feed rollers in the
contacting the rollers 6 and '22, dependingguards 40 and
path of the blanks for passing the blanks therebetween,
a guide roller having a cylindrical surface with the up
per portion thereof above the path of the blanks emerging
The operation has "been described in connection with
from between the feed rollers for diverting the bottom
the description of the apparatus, but briefly the blanks
:are delivered from other operating mechanisms'of the 65 ?aps of the blanks upwardly over the guide ‘roller, said
41 may be provided, as shown in FIG. 1.
V
envelope making machine, for example, the seal ?ap!
gumming mechanism, gum drying mechanism, side ?ap
folding mechanism, and thelike, with the blanks being
lower feed roller having a peripheral portion spaced in
?xed relation vfrom the cylindrical surface of the guide
roller to provide a pass therebetween according to the
thickness of the blanks, a substantially ?at guide means
fed to the flap folding mechanism of the present inven
tion between the feed rollers 2 and 3, with the‘bottom 70 having one end extending under the guide roller to carry
the blanks thereon ‘away from said pass to allow absorp
?ap leading and the closure or sealing ?ap trailing, 'onto
tion of the gum into the material of the blanks, and
the horizontal guide 4, ‘where the roller 5 applies the
upper and lower creasing and pressing rollers separate
gum stripes g and h to the intumed side ?aps.
from the .feed and guide rollers and located at the other
The blank is now in position where the feed rollers 6
and 7 engage the blank and advance the blank with the 75 end of the ?at guide means, said portion of the‘lower
3,088,382
5
6
feed roller having means for seizing a blank to initiate
a fold in the bottom ?ap as the seized portion of the
in ?xed relation from the cylindrical surface of the guide
blank is carried downwardly under the guide roller and
through said pass without pressing the bottom ?ap into
?rm sealing contact with the side ?aps while the blank
is pushed across the substantially flat guide means by the
feed rollers for bringing the fold into engagement with
the creasing and pressing rollers for creasing the fold and
?rmly pressing the bottom ?ap into sealing contact with
the gummed side ?aps.
2. A bottom ?ap folding mechanism for an envelope
making machine in which the envelope blanks are deliv
ered to the folding mechanism with side ?aps folded
and gummed and with the bottom ?aps leading, said
roller to provide a pass therebetween ‘according to the
thickness of the blanks, and means on the lower feed
roller for seizing a blank to initiate a fold in the ?ap and
for carrying the seized portion of the blank downwardly
under the guide roller to make said initial fold and to
draw the ?ap from over the guide roller.
4. A bottom flap folding mechanism for an envelope
making machine in which the envelope blanks are de
livered to the folding mechanism with side ?aps folded
and gummed and with the bottom ?aps leading, said fold
ing mechanism including upper and lower feed rollers in
the path of the blanks for passing the blanks therebe
tween, a guide roller having cylindrical surface with the
folding mechanism including upper and lower feed roll-i 15 upper portion thereof above the path of the blanks emergers in the path of the blanks for passing the blanks
ing from the feed rollers for diverting the bottom ?aps
of the blanks upwardly over the guide roller, said lower
therebetween, a ramp in spaced relation with the feed
feed roller having a peripheral portion spaced in ?xed re
rollers on the delivery side thereof, a guide roller in
lation from the cylindrical surface of the guide roller
said space between the feed rollers and the lower end of
the ramp and having a cylindrical surface with the upper 20 to provide a pass therebetween according to the thick
portion thereof located across the path of the blanks
ness of the blanks, a substantially ?at guide means having
emerging from the feed rollers for diverting the bottom
a forward end extending under the guide roller, upper
?aps of the blanks upwardly over the feed roller onto the
and lower creasing and pressing rollers separate from the
ramp, said lower feed roller having a peripheral portion
feed and guide rollers and located at the delivery end of
spaced in ?xed relation from the cylindrical surface of 25 said guide means, said lower feed roller having a pe
ripheral passageway transversely of the path of the
the guide roller to provide a pass therebetween accord
ing to the thickness of the blanks, a substantially ?at
blanks and across which the bottom ?aps travel, and a
guide means having one end extending under the guide
nozzle for discharging a jet of air from said recess for
roller to carry the blank thereon away from said pass to
lifting the bottom ?aps onto the top of the guide roller,
allow absorption of the gum into the material of the blanks, 30 said peripheral portion of the lower feed roller having
and upper and lower creasing and pressing rollers sepa
means for seizing a blank to initiate a fold in the bottom
rate from the feed and guide rollers and located at the
?ap as the seized portion of the blank is carried down
delivery end of the flat guide means, said portion of the
wardly under the guide roller and onto said guide means
lower feed roller having means for seizing .a blank to
for withdrawing the bottom ?ap from across the top of
initiate a fold in the bottom ?ap as the seized portion 35 the guide roller and through said pass without pressing
of the blank is carried downwardly under the guide roller
the bottom ?ap into ?rm sealing contact with the side
and onto the substantially ?at guide means for withdraw
?aps while ‘the blank is pushed across said guide means
ing the bottom flap thereof from the ramp and around the
by the feed rollers for bringing the initial fold between
the creasing and pressing rollers for pressing the bottom
‘guide roller into loose contact with the gum on the side
?aps while the blank is pushed across the substantially
?ap int-o ?rm sealing contact with the gummed side ?aps.
?at guide means by the feed rollers for bringing the fold
References Cited in the ?le of this patent
into engagement with the creasing and pressing rollers for
pressing the bottom ?ap into ?rm sealing contact with the
UNITED STATES PATENTS
gum of the side ?aps.
Novick ______________ __ June 2, 1931
3. In a ?ap folding mechanism for an envelope making 45 1,807,867
1,879,990
Oles ________________ .... Sept. 27, 1932
machine, upper and lower feed rollers in the path of the
1,884,468
Winkler _____________ __ Oct. 25, 1932
blanks for passing the blanks therebetween, a guide roller
1,985,859
Goder ______________ __ Dec. 25, 1934
having a cylindrical surface with the upper portion thereof
2,143,715
Rosebush ____________ .... Jan. 10, 1939
located above the path of the blanks emerging from the
Novick ______________ __ June 10, 1941
feed rollers for diverting a leading ?ap on the blanks, 50 2,244,723
said lower feed roller having a peripheral recess across
which the ?ap of said blanks move, a nozzle for dis
charging a jet of air through the recess and into con
tact with the flap ‘for lifting the ?ap over the guide roller, 55
said lower feed roller having a peripheral portion spaced
2,851,934
2,944,470
Heywood ____________ __ Sept. 16, 1958
Doetsch ______________ __ July 12, 1960
172,287
Germany ____________ __ June 21, 1906
FOREIGN PATENTS
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