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Патент USA US3059557

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Oct. 23, 1962
_
3,059,547
T. E. PIAZZE
SIDE SEAM SEALING MECHANISM FOR BAG MAKING MACHINES
Filed Jan. 26, 1959
4 Sheets-Sheet 1
INVEN TOR.
I
BY
Oct. 23, 1962
T. E. PrAzzE
3,059,547
SIDE SEAM SEALING MECHANISM FOR BAG MAKING MACHINES
Filed Jan. 26, 1959
4 Sheets-Sheet 2
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Oct. 23, 1962
T. E. PIAZ'ZE
3,059,547
SIDE SEAM SEALING MECHANISM FOR BAG MAKING MACHINES
Filed Jan. 26, 1959
4 Sheets-Sheet 3
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INVENTOR.
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Oct. 23, 1962
3,059,547
T. E. PIAZZE
SIDE SEAM SEALING MECHANISM FOR BAG MAKING MACHINES
Filed Jan. 26, 1959
4 Sheets-Sheet 4
vs
INVEN TOR.
BY
5:
United States Patent Q
3,059,547
1
1
Patented Oct. 23, 1962
2
FIGURE 2 to an enlarged scale and with portions broken
3,659,547
away;
SIDE SEAM SEALING MECHANISM FOR BAG
MAKING MACHINES
'
FIGURE 7 is a section taken on the line 7—7 of FIG
-
URE 6;
Thomas E. Piazze, Mount Vernon, Ohio, assignor to
Continental Can Company, Inc, New York, N.Y., a
' FIGURE 8 is a fragmentary plan View taken on the
line 8-8 of FIGURE 6; and
FIGURES 9 and 10 are schematic views illustrating
Filed Jan. 26, 1959, Ser. No. 788,820
successive operations in the manufacture of the bags.
8 Claims. (Cl. 93-—12)
The illustrated machine in which the invention is em
This invention relates to packaging and is particularly 10 bodied is adapted to fabricate bags which are formed
from either single or multi-ply material drawn from a
concerned with improvements in a machine for automati~
single supply roll or a plurality of rolls. Two webs are
cally fabricating from a web of pliable sheet material
fed or a single web is split longitudinally and the two
open ended bag type containers which are adapted to
receive goods to be packaged.
portions fed in a vertical path through an adhesive ap
The invention is especially adapted to be embodied in 15 plying mechanism and an intermittently operated trans
corporation of New York
apparatus which constitutes an improvement in the ma
verse severing device which is timed to sever from the
chine disclosed in applicant’s copending application Serial
traveling ‘web portions individual sheets 10 (FIGURES
1, 2, 9 and 10). The sheets 10 are guided into the paths
No. 657,853, ?led May 8, 1957, now Patent No. 2,942,
of a plurality of forming mandrels 11 carried in double
529, dated June 28, 1960, which machine is of the type
wherein a continuous web of heat sealable bag forming 20 line arrangement on endless chains which operate as a
single conveyor 12. The sheet material which forms the
?lm material is divided into bag forming sections or
walls of the bag is preferably a ?exible, transparent, heat
sheets, successive sheets are fed to a series of forming
scalable ?lm material, such as cellophane, mylar, plio?lm,
mandrels carried on a continuously traveling conveyor
polyethylene or similar plastic. In feeding the webs to
which mandrels engage the sheets and carry them past as
the mandrels an adhesive, of the quick drying heat acti—
sociated folders which ‘fold the sheets into bag forming
vatable type, is applied in laterally‘ spaced stripes or lines
relation around the mandrels, after which they are en
13 to the marginal portions of the sheets 10 so that the
gaged by heat sealers which form longitudinal side seams
marginal portions may be overlapped and the adhesive
in overlapped marginal portions of thesheets.
activated to form the side seams.
It is a general object of the invention to provide in a
bag making machine of the type described an improved 30
mechanism for engaging heat sealing irons with the man
drels to form longitudinal side seams in overlapped mar
ginal portions of the bag material which is carried on the
mandrels.
It is a more speci?c object of the invention to provide
in a bag making machine of the type which has a series
The two lines of forming mandrels 11 (FIGURES 1, 2,
9 and 10) are arranged in spaced relation and in longi
tudinal alignment on the supporting conveyor 12 for in
termittent advancing movement in parallel horizontal
paths. Each successive mandrel 11 (FIGURES 9 and
10) picks up a bag forming sheet 10 as the latter is fed
into its path, the mandrel engaging the inside surface of
the sheet 10 intermediate the ends thereof. The man
of mandrels carried on a continuously traveling con
drels 11 advance through folding mechanism 14 which
veyor, a sheet feeding mechanism which delivers to each
operates to fold each sheet 10 around a mandrel 11 so
of the mandrels a bag forming sheet, and a folding tun
nel in which the sheets are shaped around the mandrels, 40 that the marginal side edge portions which carry the lines
of adhesive 13 are overlapped on the side faces of the
the improvement which comprises a cross shaft mounted
mandrel 11. From the folding mechanism 14 the respec
above the path of the mandrels adjacent the end of the
tive mandrels 11 advance to a heat sealing mechanism
folding tunnel, a pair of bracket members mounted in
15 which comprises a double line of heat sealing irons 16,
threaded relation thereon, which bracket members sup
port in depending relation therefrom sealing irons 45 the latter being arranged in paired relation on opposite
adapted to be engaged with the mandrels to form longi
tudinal side seams in overlapped marginal portions of
the sheets thereon and mechanism for rotating the cross
sides of the path of each line of mandrels 11. The heat
sealing members 16 are reciprocated to press against the
opposite side faces of the mandrels 11 so as to form a
T-shaped seam 17 in each of the overlapped marginal
gagement with the mandrels.
edge portions of the sheet which constitute the side walls
of the completed bag 18. As the mandrels 11 advance
These and other objects and advantages of the inven
‘beyond the heat sealing members 16 the bags 18 are
tion will be apparent from a consideration of the appa
stripped from the mandrels 11 and delivered from the
ratus which is shown by way of illustration in the ac
machine.
companying drawings wherein:
The conveyor 12 and associated bag forming mecha
FIGURE 1 is a side elevation of a portion of a bag 55
nisms are supported on an upright frame, portions of which
forming machine having incorporated therein the princi
are indicated at 20 (FIGURES 1, 2 and 6). The conveyor
pal features of the invention, the view being partly dia
shaft to move the sealing irons into and out of en
grammatic;
12 comprises laterally spaced pairs of endless chains 21
(FIGURE 2) which are supported at opposite ends on
chine shown in FIGURE 1 with parts thereof broken 60 pairs of forward and rearward sprocket members 22 and
FIGURE 2 is a plan view of the portion of the ma
away or omitted;
FIGURE 3 is a side elevation to an enlarged scale of
23, which sprocket members are mounted on cross shafts
24 and 25, with the cross shafts being journaled in up
standing side plate members of the supporting frame 20.
a portion of the mechanism shown in FIGURE 1;
The bag forming mandrels 11 are each secured between
FIGURE 4 is a side elevation showing a portion of the
mechanism of FIGURE 3 with the members in a differ 65 a pair of chains 21 by a bracket member 26 which is
ent position;
FIGURE 5 is a side elevation to an enlarged scale of
a portion of the mechanism shown in FIGURE 2, the
view being taken on the far side of the machine and hav
ing portions broken away;
FIGURE 6 is a cross section taken on the line 6—-6' of
secured on a pair of transverse supporting rods 27 so that
the mandrels extend forwardly of their attachment to the
chains and move in a generally horizontal plane when they
advance along the top run of the conveyor, the two lines
70 of the mandrels traveling in the same horizontal plane
and in parallel paths which are spaced transversely of the
machine. _
'
3,059,547
4
3
The sprocket supporting shaft 24 at the forward end of
the conveyor 12 is connected by a gear drive, indicated
at 28, to the main drive shaft of the machine which is
indicated at 30, and which is connectedwith the output
shafts 42 and 42'. The guide rollers 55 and the guide bars
57 and ‘57' insure cross travel of the brackets 43 without
tilting motion around the supporting and operating shafts
shaft of a suitable motor (not shown) or other source of
power. The driving connection between the main drive
shaft 30 and the conveyor shaft 24 includes an intermit
tently operationg Geneva mechanism for providing inter
mittent movement of the conveyor 12.
'
42 and 42'.
The shafts 42 and 42' are extended at one end through
the vertical frame plate 41 and carry on their extended
ends pinions 60 and 60' which engage with a horizontally
sliding rack 61. The rack 61 is mounted in a carriage
forming upwardly opening channel-shaped bar 62. The
The mandrels 11 are supported and guided along the 10 rack carriage 62 is supported on a pair of longitudinally
spaced bearing rollers 63 and 63' which are arranged on
upper run of the conveyor 12 on transversely extending
shaft forming studs 64 and 64' on the side frame plate 41.
table foiming plate members 31 which are slotted longi
In addition to the pinion and rack connection, the two
tudinally at 32 to provide a passage or guideway for the
shafts 42 and 42' are also connected by a chain 65 mount
brackets 26 connecting the mandrels 11 with the chains
21 of the conveyor 12. The plate members 31 are also 15 ed on sprockets 66 and 66' secured on the respective shafts
42 and 42’ so as to insure simultaneous rotation of the
transversely slotted at 33 to accommodate the leading ends
two shafts with uniform movement thereof. The shafts 42
of the bag forming sheets 10. Each successive mandrel
and 42' are rotated or oscillated by reciprocation of the
11 engages the leading end thereof with a bag forming
rack 61 to carry the sealing irons 16 toward and from
sheet 10 as the mandrel advances onto the supporting plate
31 and the sheet 10 is fed into the path of the mandrel. 20 the mandrels 11.
The movement of the rack 61 is controlled by a cam
The mandrel carries the sheet 10 through a folding chute
14 which includes fold forming plates arranged to co
operate with the mandrels in wrapping the sheet 16 about
the mandrel with the side marginal portions of the sheet
in overlapped relation for forming a side seam. Details
of the mechanism for guiding the mandrel and for folding
the sheet about the mandrel which are not shown and de
scribed herewith are disclosed in applicant’s copending ap
operated mechanism (FIGURES l and 3) connected to
one end thereof. A link bar 70 has one end thereof
pivotally connected at 71 to the end of the rack car
riage 62 and is provided at its other endwith a handle
forming portion 72. The link bar 70 has an L-shaped
slot 73 intermediate its ends which receives a pin 74 pro
jecting laterally of the free end of the vertically ex
tending arm 75 of a bell crank member 76 which is piv
As the mandrels 11 are advanced by the conveyor 12 30 oted at 77 on the side frame 2b of the machine and has
plication Serial No. 657,853.
.
beyond the folding chute 14, they pass through a heat
sealing mechanism 15 which activates the adhesive in the
lines 13 between the folded marginal portions of the sheet
10 so as to form a T-shapcd seal 17. The heat sealing
mechanism 15 is mounted on a subframe 40 (FIGURE 2) .
which comprises upright side frame plates 41 and 41' ex
tending above and attached to longitudinal side frame
plates of the main supporting frame 20, adjacent the end
a short horizontally extending arm '73 carrying a cam
roller 80 which is received in the cam track 81 of the
operating cam 82. The cam 82 is mounted on the cross
shaft 83 which carries a gear 84 connected in driven
relation with a pinion 35 on the cross shaft 86, the latter
being connected with the main power shaft 30. The pin
74 on the vertical arm 75 of the bell crank normally
rides in the short vertically extending leg 87 of the slot
73 and reciprocates the rack carriage 62.
The link bar '70 is adapted to be swung on its pivot
mechanism 15 comprises two longitudinally spaced, trans
71 to an elevated position for preventing reciprocation
versely extending lines of heat sealing iron members 16
of the rack carriage 62. Raising of the link \bar 70 throws
which are supported on transversely extending, longi
the pin 74 into the long horizontal portion 88 of the slot
tudinally spaced shafts 42 and 42'. The shafts 42 and 42’
73 which prevents reciprocation of the rack carriage
are journaled at theirends in suitable hearings in the
62. The link bar 70 is lifted by movement of the ‘hanger
upright side frame plates 41 and 41’.
45 bar 90 (FlGURES 3 and 4) which is pivotally sus
The heat sealing. members ‘or bars 16 are identical
pended at 91 on the free end of a crank arm 92, the
in construction and each is provided with a suitable elec
of the upper run of the conveyor 12. The heat sealing
latter being secured on a cross bar or shaft 93 journaled
trical resistance element for heating the same. The two
in the side frame plates 41 and 41'. The crank arm
lines of sealing bars 16 are carried in an identical manner
on the cross shafts 42 and 42’. Each sealing bar or iron 50 92 is connected by a link 94 with a crank arm 95 see
cured on an upper shaft 97 extending between upstand—
16 (FIGURES 5 and 6) is attached to the lower end of
ing bearing brackets 98 and 98’ on the top edge of the
a supporting bracket 43 which depends from the cross
side plates 41 and 41'. The hanger 90 has a bifurcated
shaft 42 or 42'. The brackets 43 are arranged in pairs and
lower end which straddles the link bar 70 and which is
each sealing iron 16 is attached to its supporting bracket
with a cross pin 100. The cross pin 100 is
43 by a pair of stud bolts 44. The bolts 44 extend through 55 provided
adapted to engage with the bottom edge of the link 70
vertical slots 45 in the two legs of the bracket 43 so as to
when the shaft 97 is rotated to lift the hanger 90 a pre—
permit vertical adjustment of the sealing iron 16 on the
determined distance. A latch mechanism is provided at
_bracket 43. ‘The supporting brackets 43 each have a
the opposite side of the machine to hold the shafts
hub forming portion 46 which ?ts over the hub portion
93 and 97 in either of the two positions which are shown
47 of a ?anged bushing 48 with one end thereof abutting 60 in FIGURES 3 and 4. The latch ‘mechanism comprises
against the peripheral ?ange 49 on the bushing 48 and con
an arm 101 (FIGURE 5) secured on ‘the shaft 97 and
nected thereto by stud bolts 50 extending through periph
connected ‘by pivot 102 with the upper end of a bi
erally spaced slots 51 which permit adjustment between
furcated member 103 having its depending legs 104 and
the bracket 43' and the bushing 48. The hub portion 47
104' straddling a 5block 105 pivotally mounted on the
of reach bushing 48 is internally threaded and the shafts 42
shaft 93. A compression spring .106 extends between the
and 42’ are provided with left and right hand threaded
block 105 and a ?ange or tongue member 107 extending
portions 52 and 52' for cooperation therewith. Each of
the brackets 43 has an upstanding ?ange portion 54 which
carries a pair of guide rollers 55, with the latter mounted
on vertically extending spaced shaft forming studs 56 so 70
as to engage on opposite sides of a cross guide bar 57. The
from the face of the member 103 and urges the mem~
her 103 and block 105 away from each other with the
force of the spring exerted on a line connecting the axis
of pin 102 and shaft 93. A handle 108 is provided on
the upper shaft 97 so that the shaft 97 may be rotated
to swing the pin 102 forward and backward between op
guide bars 57 and 57' (‘FIGURE 3) for the two lines of
sealing members are secured at the opposite ends to the
posite sides of a vertical plane extending through the axes
upper edges of the upstanding bracket members ‘58 and
of the shafts 93 and 97. Stop pins 110 and 110' are pro
58' which form part of the bearing sturctures for the cross 75 vided to limit the rotational movement of the shaft and
3,059,547
5
hold the latch mechanism in operative position in either
one or the other of its two positions.
A pair of guard plates 1‘11 and 111' (FIGURE 8) are
secured on the frame at the end of the folding chute 33
and below the shaft 42 to hold the overlapped side seam
material in position until the ?rst sealing contact with the
sealing irons 16.
6
pair of spaced cross shafts extending transversely of the
conveyor which cross shafts have right and left hand
threaded portions, brackets having threaded bores
mounted on the threaded portions of said cross shafts,
each of said brackets carrying a heat sealing iron, said
brackets being arranged in pairs with the sealing irons
of each pair positioned in spaced apart relation on oppo
site sides of the path of the mandrels, and means for in
Wheel 112 to facilitate adjustment of the stroke and tim
termittently rotating said cross shafts in timed relation
ing of the sealing irons 16 While the machine is idle or 10 to the advancing movement of the conveyor whereby to
while the rack carriage 62 is not reciprocating.
move the brackets of each pair thereof toward each other
The one cross shaft 42 may be provided with a hand
-In the operation of the mechanism, the sealing irons
so as to engage the sealing irons against the sides of the
16 are adjusted on the brackets 43 for contact with the
mandrels which are advanced by the conveyor, said
mandrels v11 at the proper elevation. The brackets 43
rotating means comprising a reciprocating rack and
are then adjusted by means of the bolt 50 and slot 51 15 pinions on said shafts engaging with said rack.
connections with the mounting sleeves 48 to provide the
proper reciprocating movement for obtaining the desired
pressure of the irons 16 against the mandrels 11 when
the shafts 42 and 42’ are rotated.
The rotational move
ment of the shafts 42 and 42' is adjusted by proper loca
tion or adjustment of the pinions 60, 60' and the sporck
[.15
ets 66, 66' on the shafts to provide simultaneous move
ment of all the irons 16. The reciprocating movement
of the operating rack 61 is timed by adjustment of the
3. In a machine for forming ?exible containers, where
in a series of bag forming mandrels are mounted on a
supporting conveyor and adapted to be moved against
sheets of bag forming material delivered into the path
traversed by the mandrels and through a folding tunnel
for positioning the sheets around the mandrels with
marginal portions overlapping in seam forming relation
and with a heat activatable material between the over
lapped marginal portions: a heat sealing mechanism com
cam 82 on its shaft 83 so that the sealing irons 16 25
prising a pair of cross shafts spaced in the direction of
engage the mandrels 11 while the intermittently operat
ing conveyor 12 is at a standstill between advancing
movements. The sealing mechanism may be thrown out
of operation at any time by merely swinging the link
right and left hand threaded portions, brackets having
position.
ing irons of each pair positioned in spaced relation and
travel of the mandrels and extending transversely of the
conveyor which cross shafts each have axially spaced
70 to the inoperative or up position so that the pin 30 threaded bores mounted on the threaded portions of said
cross shafts, each of said brackets carrying a heat sealing
74 rides in the slot portion 88. The link 70 may, of
iron, said brackets being arranged in pairs with the seal
‘course, be latched in either operative or non-operative
on opposite sides of the path of the mandrels, and means
While particular materials and speci?c details of con
struction have been referred to in describing the illus 35 for rotating said cross shafts in timed relation to the
advancing movement of the mandrels whereby to move
trated form of the apparatus, it will be understood that
the
brackets of each pair thereof toward and from each
other materials and different structural details may be
other so as to engage the sealing irons against the sides
resorted to Within the spirit of the invention.
of the mandrels, said rotating means comprising a slid
I claim:
I
1. In a machine for forming ?exible containers, which 40 ably mounted rack, pinions on said shafts engaging with
said rack and means for intermittently sliding said rack
machine has a traveling conveyor mounted on a sup
porting frame with bag forming mandrels mounted in
longitudinally spaced relation thereon so as to move
back and forth on its mounting.
4. In a machine as recited in claim 3, and said rack
sliding means comprising a rotatable cam, a bell crank
against sheets of bag forming material delivered into the
path traversed by the mandrels and folders adjacent the 45 pivotally mounted for oscillation by said cam, a link
having a pivotal connection with said rack, and a pin
path of the mandrels for positioning the sheets around
and slot connection between said link and said bell crank.
the mandrels with marginal portions overlapping in seam
5. In a machine for forming bags from ?exible sheet
forming relation and with lines of heat activata-ble ad
material which machine has a bag forming mandrel
hesive between the folded over marginal portions: a
heat sealing mechanism comprising a cross shaft exten - 50 mounted on a movable support and associated mecha
nism for forming a sheet of the material around the man
ing transversely of the conveyor which cross shaft has
axially spaced right and left hand threaded portions,
drel with portions overlapping in seam forming relation
brackets having threaded bores mounted on the threaded
portions of said cross shaft, each of said brackets carry
forming portions: a heat sealing mechanism comprising
and with a heat activatable material between the seam
ing a heat sealing iron, said brackets being spaced to posi 55 a rotatably mounted cross shaft extending transversely of
the path of the movable support which cross shaft has
tion the sealing irons on opposite sides of the path of
axially spaced right and left hand threaded portions, a
the mandrels, and means including a driven cam for
intermittently rotating said cross shaft to move said
brackets laterally of the path of travel of the conveyor
- pair of brackets having threaded bores mounted in spaced
relation on the threaded portions of said cross shaft, each
of said brackets carrying a heat sealing iron, said brackets
mandrels and toward and from each other at predeter
mined intervals so as to engage the sealing irons against 60 being spaced so that the sealing irons extend therefrom
on opposite sides of the path of the movable support, said
the sides of successive mandrels which are advanced by
the conveyor for periods sufficient to activate the ad
cross shaft having a pinion thereon, a rack mounted for
reciprocating movement adjacent the pinion and cooper
hesive and form the seams in the overlapping portions of
the sheets.
ating with the pinion to oscillate said shaft thereby to
2. In a machine for forming ?exible containers, which 65 move the brackets toward and from each other on the
machine has a traveling conveyor mounted on a sup
porting frame with bag forming mandrels mounted in
longitudinally spaced relation thereon so as to move
shaft and intermittently engage the sealing irons against
the mandrel, a guide ba-r mounted in ?xed parallel rela
tion with said cross shaft, and means forming a sliding
connection between each bracket and said guide bar
against sheets of bag forming material delivered into the 70
whereby to prevent rotation of the bracket on said cross
path traversed by the mandrels and folders for position
shaft while permitting movement thereof in the direction
ing the sheets around the mandrels with marginal por
tions overlapping in seam forming relation and with a
heat activatable adhesive between the folded over mar
ginal portions: a heat sealing mechanism comprising a
of the axis of rotation of said cross shaft.
6. In a machine for forming ?exible containers, said
machine having a traveling conveyor mounted on a sup
porting frame with bag forming mandrels carried on the
3,059,547
8
conveyor and means for folding‘around the mandrels
tending,‘ ?xed guide means, cooperating movable guide‘
sheets of bag forming material delivered into the path
traversed by the mandrels which sheets have overlapping
seam forming portions with heat sealing characteristics,
transverse path and intermittently operating power means
a heat sealing mechanism comprising a cross shaft ex
tending transversely of the conveyor, brackets mounted
for reciprocating movement on said cross shafts, means
connecting the brackets to the shaft so that they move
means on the brackets for guiding said brackets in a
for oscillating said cross shaft in timed relation to the
travel'of the conveyor ‘thereby moving said brackets to
ward and from the mandrels and intermittently engaging
the sealing irons against successive mandrels as they are
advanced by said conveyor so as to activate the adhesive
on the seam forming portions of the bag material.
along the axis of the shaft when the shaft is rotated, a
8. In a machine for forming bags from ?exible sheet
heat sealing iron on each of said brackets, said brackets 10
material, said machine having a bag forming mandrel
being spaced so that the sealing irons are positioned on
mounted on a movable support and associated mechanism
opposite sides of the path of the mandrels, a transversely
for forming a sheet of material around the mandrel with
extending ?xed support member, interengaging means
portions overlapping in seam forming relation and with
on said brackets and said ?xed support member for guid
heat activatable material between the seam forming por
ing said brackets in their reciprocating movement and
tions, a heat sealing mechanism comprising a rotatably
continuously operating power means having an inter
mounted cross shaft extending transversely of the path of
mittently operating connection with said cross shaft so
the movable support which cross shaft has axially spaced
as to reciprocate said brackets on the shaft and engage
right and left hand threaded portions, a pair of brackets
the sealing irons against the sides of successive mandrels
as they are advanced by said conveyor for a su?’icient 20 having threaded bores mounted in spaced relation on the
threaded portions of said cross shaft, each of said brackets
interval of time to seal the overlapping seam forming
carrying a heat sealing iron, said brackets being spaced so
portions of the bag forming material and thereafter to
that the sealing irons extend therefrom on opposite sides
withdraw the sealing irons from engagement with the
of the path of the movable support, intermittently operat
mandrels.
7. In a machine for forming ?exible containers, said 25 ing power driven means connected to said shaft for oscil
lating said shaft at regular intervals thereby to move the
machine having a traveling conveyor mounted on a Sup
brackets toward and from each other on the shaft and in
porting frame with bag forming mandrels on the conveyor
termittently engage the sealing irons against the mandrel,
and means for folding around the mandrels sheets of bag
means forming a track mounted in ?xed parallel relation
forming material delivered into the path traversed by the
with said cross shaft, and means on each bracket engaging
mandrels which sheets have overlapping seam forming
in sliding relation in said track whereby to prevent ro
portions with heat activatable adhesive thereon, a heat
tation of the‘ bracket on said cross shaft While permitting
sealing mechanism comprising a rotatably mounted cross
movement thereof in the direction of the axis of rotation
shaft extending transversely of the conveyor and having
axially spaced threaded portions, bracket sleeves having
threaded bores mounted on the threaded port-ions of said
cross shafts, brackets mounted on'said sleeves for to
tational movement, each of said brackets carrying a heat
sealing iron, said brackets and said sleeves being spaced
on said shaft so as to position thersealing irons on op
of said cross shaft.
References ?red in the ?le of this patent
UNITED STATES PATENTS
1,271,422
posite sides of the path of the mandrels, transversely ex 40 2,563,858
Bracy _________________ __ July ‘2, 1918
McGinley et a1. ______ __ Aug. 14, 1951
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