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Патент USA US2129842

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Sept. 13, 1938.
c. HOLWEG
2,129,842
PROCESS AND APPARATUS FOR THE PRODUCTION OFYFLAT BAGS
Filed May 17, 1935
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Sept. 13, 1938..
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_c. HOLWEG
2,129,842
PROCESS AND APPARATUS FOR THE PRODUCTION OF FLAT‘ BAGS
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Filed May 17, 1935
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2 Sheets-Sheet 2
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Patented Sept. 13, 1938
‘ 2,129,842
‘UNITED STATES PATENT OFFICE
2,129,842
PROCESS AND APPARATUS FOR THE PRO
DUCTION 0F
BAGS
.
Charles Holweg, .Strasbourg, France, assignor to
Atelier-s de Constructions Mecanlques C. & A.
Holweg, Strasbourg, France, a society of France
Application May 17, 1935, Serial No. 21,952
In Germany June 26, 1934
11 Claims. (01. 93-18)
The invention relates to a process for the pro
ducing of ?at bags from a continuous paper web,
which is formed into a tube and then cut ‘into
sections, whereupon one end of the sections is
turned over to form _a bottom ?ap. The tubular
sections must be separated from each other in
such a way that one end projects a little over
the other, as otherwise a simple folding-in of one
end of the tube is not sufficient for obtaining a
10 perfect closure of the bottom.
.
In'general therefore for separating the sections
of the tube from the web the strike-off method
is employed, which consists in striking off the
upper and lower parts of the tube at the same
15 time along two scalloped lines by means of a
striker which is moved transversely across the
web.
The striking-off, however, causes an un
pleasant noise; while, when the struck-off tube
sections are carried along, interruptions are often
20 caused by the arriving bags being jammed up or
crumpled.
The
strikers
are
moreover
very
dangerous for the machine tenders.
To avoid the di?iculties in the separation of
the tube pieces by a striker, it has already been
25 proposed to produce in the continuous paper web
from which the bags are made, either before or
after the formation of the tube, lines of perfora
tion de?ning the closure flaps which are subse
quently to form the bag ends. The ?nal separa
30 tion of the foremost sections of the tube is then
effected by a traction effort exerted thereon by
suitable means, for example rollers having a
higher peripheral speed than that of movement
of the tube. However, the separation is effected
35 already well before the tube sections are engaged
by the bag-end forming device, so that these
sections are obliged to travel for a certain dis
tance as, individual pieces which are in some
cases subjected to further operations and are in
40 all cases exposed to the same risks of tangling,
jamming and crumpling as the sections sepa
rated by striking.
In the process according to the invention, all
these risks are avoided by the fact that the tear
45 ing or detaching of the foremost tube sections is
effected by the bag-bottom forming device com
prising in known manner rotative tongs cooper—
ating with a synchronically turning folding
blade.
50
‘
This process makes it possible to ensure that
the web need not be or is not separated into sec
tions before the bottom is formed or in process of
forming, which not only brings about greater
continuity in the working process, but at the
65 same time a considerablev simplification and
standardization of the driving arrangements and,
moreover, permits stoppages and interruptions of
work ‘and in this way results in an increased
output capacity of the machine. Finally, the
bottom ?aps may also be-given any desired shapes 1.1
and may be on the same tube side as the ‘upper
closing ?ap, which also was not possible by the
known striking-off method.
The drawings show in diagrammatic form
various arrangements for the realization of the
invention, viz.:—
)
>
Figs. 1-3 an arrangement in which the per
foration is effected after the formation of the
tube; Fig. 1 shows the tube in different stages of
the separating-off operation and Fig. 3 shows a
15
tongue which is joined on to the tube-forming
mandrel, which tongue acts as a support for the
tube during the separation.
’
Figs. 4-6 show in side elevation and plan an ‘
arrangement in which the perforation is carried
out before the formation of the tube.
Figs. 7-10 show an arrangement as well as
various working phases for the production of
bags, in which the bottom flap is on the same
tube side as the upper closing ?ap.
According to Figs. 1-3 the formation‘ of the
tube takes place at I in the usual manner; this
is drawn over the mandrel 2 shaped as a thin
tongue by means of drawing roller pairs 2’, which
are carried‘ in two lateral recesses in the man
36
drel. Behind these drawing rollers the mandrel
is at 3 hollowed out like a comb, and two rollers 4
are arranged at this place one above and one be
low the mandrel and these rollers are provided
with a perforating device 5, the points of which
pass into the teeth in the comb without touching
one another. The perforating devices can be
shaped in any desired manner. It is preferable
that they should make a straight line for one side
of the tube and a curved line for the other.
The tube thus prepared leaves the mandrel and
by means of a further pair of drawing rollers 6
having the same peripheral speed as 2' it is car
ried to the folding apparatus ‘I of a construction
already known per se. As the peripheral. speed
of the latter is greater than the travelling speed
of the arriving already perforated tube, the fore
most of the already ‘perforated tube sections can
be separated off without dimculty at the perfo
rated places;
-
Owing to the fact that the separating-off of
the tube section takes place only after the section
has already been gripped by the folding appara
tus, a. special conveying device, such as was pre
viously indispensable for the separated-off tube 55
2
2,129,842
sections, can be dispensed with. The drawing
With the known ?at bags there is the disad
roller pair 6 canalso be moved much further vantage that the strip serving for the bottom
back, so that their positionis behind the ?rst flap and that for the closing ?ap lie at both ends
perforated position of the already perforated ‘of the tube of the bag upon opposite sides, i. e.,
tube. Their distance from the folding apparatus the bottom ?ap is turned up on one side of the
1 can moreover be varied within wide limits in tube, while the closing flap is turned up on the
order to make allowance for the different lengths other side of the tube. The cause of this is
of bag.
‘
_
due to the dependence of both strips upon each
The closing of the bottom of the bag can be other (the strips are formed, as is known, by a
10 effected in
the usual manner by the folding
in two different planes) which explains moreover
In the example of embodiment shown in Figs.
4-6 the perforation of the web I is effected before
why both ?aps must always have the same shape
v the tube is formed.
l5 ‘
simultaneous separation of both sides of the tube 10
apparatus.
Owing to this, in the ?rst
place a further simpli?cation of the machine is
effected, as only one perforating roller is required,
and also the ?at mandrel, on which both sides of
' the tube were otherwise perforated and which
and length. The demand now, however, exists
in practice, partly on aesthetic grounds and part
ly on practical grounds, to turn up both flaps 15
towards the same side ‘of the bag, and to give
them in addition different shapes and different
lengths.
-
‘
‘ owing to the friction of the driving rollers is ex
20 posed to a considerable amount of wear, is dis
This is attained, in accordance with the pres
ent invention, by giving a special shape to the 20
pensed with. The shaping plate which forms‘ lines of perforation between the sections of the
the tube can also be made adjustable in width web. These lines are in the present case shaped
in the known manner. ’
.
As'can be seen, the paper web after being un
25 wound in the known manner is provided by the
pasting wheel II with a longitudinal coating of
paste, ‘a roller l2 taking up-the counter-pressure.
This roller can either be covered with rubber, or
it may have a slit corresponding to the perforat
30 ing device.
Opposite to it a shaft I3 is mounted,
which carries a perforating device M, the rota
tion of which corresponds to the unfolded length
of the bag and which works with one revolution
per bag. The shape and the size of the perforat
ing device is made to correspond to the require
ments of the bottom pasting, as well as to the
shape of the desired opening ?ap. The perforat
ing device can be conveniently composed, accord
40
in such a way, that they surround two flaps which
can but ought not necessarily abut against one
another, namely the closing flap of one section 25
and the bottom flap of the next section, and the
separation is effected in two stages after the
formation of the tube, a ?rst stage in which the
foremost tube part before its entry into the fold
ing apparatus is separated from the next tube, 30
and a second phase, in which the waste which is
formed between the two ?aps is removed. The
manner of both separations is that the forward
end'of the part of the tube to be separated is
seized on each occasion by members, whose speed 35
of travel is greater than‘ the speed of those mem
bers which are holding or retaining the part be
hind the perforation.
ing to requirements, of straight and curved ele
In the embodiment of Figs. 7-10 there are two
ments, like typographical printing matter. These
lines 9, 9', of which the first forms the edge of 40
the closing flap of the preceding section of the
web, and the latter forms the edge of the bottom
flap of the next section of the web. By using
two lines of perforation the possibility is there
fore presented of shaping the closing and bottom 45
flaps quite independently of each other and in
elements may be pieces of an ordinary band saw.
The means for holding these elements may also
be variable in length and thickness and exchange
able.
The tube is then s'haped in the known manner
45
around a forming plate, which may be rigid or
adjustable in its width and drawn along by the
drawing device 6. This drawing device is ad
- justably mounted in the longitudinal direction,
with a view to permitting never more than one
line of perforations 9 between the drawing device
6 and the folding apparatus 1. The drive of this
drawing device is effected by means of inter
mediate wheel l6~through the shaft I5 of the
55 folding apparatus, upon which a change speed
wheel "is fastened.
[
At the given moment the folding blade l8 can
in the known manner seize hold of the projecting
end of the tube which is to form the bottom and
60 owing to its greater speed in relation to the draw
, ing device 6 it can ?nally separate the tube along
the line of perforations 9. For relieving the
folding knife a ?llet Ill can be arranged near by
it, which by pressing on the lower folding roller
65 seizes the necessarily projecting bottom end and
gives to this part of the tube in a positive manner
the acceleration necessary for separation. The
folding then takes place without the folding blade
taking part in the separating operation and the
blade therefore does <not suffer from additional
straining.
,
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Figs. 'I-lOshow an arrangement for the pro
duction of ?at bags with a lower bottom flap and
upper closing ?ap situated on one side of the
tube.
any desired manner.
The perforating blade I4 is
given the suitable shape. Before perforation the
web I receives as usual a longitudinal coating of
paste by means of the glue coating device H.
The tube is shaped in the known manner over
a forming plate, while the pair of drawing roll
ers 6 supply the necessary tension effect.
Following on the formation of the ‘tube the
separation takes place in two stages. In addi 55
tion to the folding apparatus 1 there is also ar
ranged here a special pair of separating rollers
20, 2| placed in front of the folding device. One
roller of this pair has‘ a recess over the larger
part of its circumference and it therefore only 60
comes into periodical contact with its counter
roller, in order to exert a drawing effect upon
the tube. The peripheral speed of the rollers
20, 2| is greater than that of the drawing rollers
6. The peripheral speed of the folding appa 65
ratus ‘I is likewise greater than that of the pair
of rollers 20, 2|.
When the track has passed a little way over
the contact line W, W’ of the two rollers 20, 2|,
these two "latter come into engagement with one 70
another; the seized tube part receives the in
creased peripheral speed of these rollers and a
complete separation of the same from the suc
ceeding tube takes place in accordance with the
shape of the bottom ?ap of the next part of the 75
2,129,842
tube (Figs. ‘8b and 9). The separated tube part
is now carried along further at increased speed
by the pair of rollers 20 and 2| and it travels
away from the more slowly moving tube. After
a certain interval of time, which is dependent
upon the length of the bottom closing flap, its
forward end is seized by the folding apparatus
1, while‘ at the same time the lower recessed
edge of its rear end is released by the rollers
20, 2| and only the upper paper layer of this
end is still held by the rollers. The greater
peripheral speed of the folding apparatus then
effects the separation of the waste 23 produced
between two tube parts in accordance with the
3
at a higher circumferential speed than the draw~
ing rolls, and a ?llet on said bottom-forming
means for gripping a tube section and advancing
it at a higher linear speed than the remainder
of the tube.
5. An apparatus for manufacturing paper bags
from a continuously moving paper web compris
ing a device for transversely perforating the web,
a tube forming device, drawing rolls for the tube,
and a rotative bottom-forming device turning at 10
a higher circumferential speed than the draw
ing rolls effective to grip the fore end of a tube
section to tear it away from the remainder of the
. tube.
6. An apparatus for manufacturing paper bags
shape of the closing ?ap of the part of the tube
seized (Fig. 8C and Fig. 10); The waste 23 is from a continuously moving paper web compris
ing a device for transversely perforating the web, '
lifted through a series of points “on to the roll
er 2| and carried downwards where it is stripped, a tube forming device, drawing rolls for the tube,
off by a rake 25 and stored up in a container 26. “ a rotative bottom forming device turning at a
20
though it would be more cumbersome and ex
higher circumferential speed than the drawing 20
rolls and a. ?llet ,on' said bottom-forming device
for gripping the *‘fore end of a tube section to tear
pensive to do so.
it way from the remainder of the tube.
However the waste can also be removed by two
or more rollers instead of by this one roller, al- ~
1
'
In orderto be able to make allowance for
various lengths of bag and ?ap, the drawing
rollers 6, the separating rollers 2|], 2| and the
folding apparatus 1 are so arranged that the
distances between the same can be varied.
_ As shown in Figs. 1 and 8C, the bag bottom is
30 formed by folding the cut-out end about a line
arranged inwardly of the cut-out portion, thus
presenting a double thickness of the tube to the
folding mechanism, thereby preventing injury
to the tube and producing a bag having a
stronger than usual bottom structure.
The further working-up of the bag is carried
out in the known manner.
I claim:
‘
1. An apparatus for manufacturing paper bags
40 from a continuously moving paper web compris
ing a device for transversely perforating the web,
a tube-forming device, drawing rolls for the tube,
and rotative bottom-forming means operating
at higher peripheral speed than said drawing
45 rolls effective to separate a tube section by ad
vancing it at a higher linear speed than the re
.mainder of the tube.
2. An apparatus for manufacturing paper bags
from a continuously moving paper web compris
'50 ing a device for transversely perforating the web,
a tube-forming device, drawing rolls for the tube,
rotative bottom-forming means operated at a
higher circumferential speed than the drawing
rolls and? a fillet on said bottom-forming means
for gripping a tube section and advancing it at
a higher linear speed than the remainder of the
tube.
3. An apparatus for manufacturing paper bags
- from a continuously moving paper web compris
60 ing 'a rotating member, perforating means car
ried thereby, a co-operating roller having a re
silient surface engageable by said perforating
means, ‘a tubevforming device, drawing rolls for
the tube, and rotative bottom-forming means op
65
erating at higher circumferential speed than
said drawing rolls effective to separate a tube
section by advancing it at higher linear speed
than the remainder of the tube.
4. An apparatus for manufacturing paper bags
from a continuously moving paper web compris
ing a rotating member, perforating means car
7. An apparatus for manufacturing paper bags
from a continuously moving paper web compris-v 25
ing a tube forming mandrel, a comb-like per
forated prolongation and lateral drawing rollers
on said mandrel, perforating rollers above and
beneath the comb perforations of the prolonga
tion, drawing rolls following the perforating roll 30
ers and a rotative bottom forming device turning
at a higher circumferential speed than the draw
ing rolls.
8. An apparatus for manufacturing paper bags
from a continuously moving paper web compris 35
ing a device for transversely perforating the web,
perforating blades on the perforating device sur
rounding a bottom flap of one tube section and an
upper closing flap of the preceding tube section,
a tube-forming device, drawing rolls for the tube, 40
periodically acting tearing rolls the circumferen
tial speed of which is higher than that of the
drawing rolls and a rotative bottom-forming de
vice the circumferential speed of which is higher
than that of the periodically acting tearing rolls. 45
9. In the process of manufacturing paper bags
with flat bottoms .wherein a paper tube having
longitudinally spaced transverse perforations
dividing the same into sections of uniform length
is continuously advanced at a uniform rate, the 50
steps of folding corresponding ends of successive
sections to form bag bottoms and simultaneously
increasing the rate of advance movement of the
section being subjected to the bottom-forming
operation to separate it from the tube.
.
55
10. In a process for manufacturing paper bags
with flat bottoms wherein a web of paper is con
tinuously advanced at a uniform rate and formed
into a tube, the steps of perforating the paper web
to divide it into sections of uniform length, fold
ing said perforated web into a tube, folding cor
responding ends of successive sections to form bag
bottoms and simultaneously increasing the rate of
advance movement of the section being subjected
to the bottom-forming operation to separate it
from the tube.
11. In a process for manufacturing paper bags
with ?at bottoms and upper closing flaps turned
on the-same side as the bottom wherein a web of 70
paper is continuously advanced at a uniform rate
silient surface engageable by said perforating
and formed into a tube, the steps of transversely
perforating the web to divide the tube into sec
means, a tube-forming device, drawingrolls for
the tube, rotative bottom-forming means turning
tions of uniform length, said perforations being
along lines of which one is shaped like the edge of 75
ried thereby, a co-operating roller having a re
4
2,129,842
the closing ?ap of the leading tube section and the
second is shaped like the edge of the bottom ?ap
of the succeeding tube section, increasing the rate
of advance movement; of the leading section to
separate it from the tube along the second line of
perforation, folding the leading end of the section
to form the bag bottom and simultaneously in
creasing the rate of advance movement of that
portion of the section ahead of said ?rst line of
perforations, thereby separating said portion from
the remainder.
CHARLES HOLWEG.
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