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Патент USA US2132546

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Oct. 11, 1938.
E. L. sM‘rrH
'
4
2,132,546
TUGKING DEVICE FOR WRAPPING MACHINES
Filed NOV. 4, 1936
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37
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INVENTOR
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BY
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*WM.
‘ITORNEYS
Patented Oct. 11, 1938
- UNITED
STATES
PATENT OFFICE
2,132,546
TUCKING DEVICE FOR WRAPPING
MACHINES
Elmer Lovell Smith, Longmeadow, Mass., as
signor to Package Machinery Company, Spring
?eld, Mass., a corporation of Massachusetts
Application November 4, 1936, Serial No. 109,085
5 Claims.
This invention relates to wrapping machines
and more particularly to means for forming
folds or tucks in the portion of the wrapper
which extends beyond the ends of the article
5 after the latter has been partially enclosed in
the wrapper.
>
In wrapping relatively thin articles, such as
sticks of gum, it is customary after the wrapper
has been carried around the article by means
10 of a tumble box, or equivalent devices, to fold
the extending ends of the wrapper ?at against
one face of the article without side tucks being
formed in the end extensions. It has been found
that with a fold of this character the flattening
15 of the tubular extension against the face of the
article projects the folded ends beyond the sides
of the article, interfering with the smooth appli
cation of a label to the individual articles or
to a stack of wrapped articles such as constitute
20 the usual gum package.
To overcome this difficulty it has been found
desirable to form a. tuck in at least one side
of the tubular extensions before they are folded
over onto the article so that the wrapper will
25 present a smooth surface on at least one side of
the article or package of articles.
Because of the thinness of articles such as
gum sticks, and the speed at which wrapping
machines of this character must be operated if
30 production costs are to be kept within accepta
ble limits, the usual type of end folders or tuck
ers cannot in practice be employed. It is the
principal object of my invention to provide a
tucking or end folding device which will operate
35 satisfactorily on thin articles such as sticks of
gum and which can be incorporated with the
wrapping instrumentalities heretofore used with
out interference with the operation of the latter
and without increasing the time of operation. In
40 accordance with the invention the folding device
is mounted in the path of motion of the portion
of the wrapper to be folded, and operates by
allowing the wrapper to impinge upon it during
the motion of the article.
It is generally neces
45 sary to withdraw the folder from adjacency with
the article to avoid interference with other parts
of the wrapper; and this is conveniently done
by giving the folder a motion, preferably of ro
tation, synchronized with the motion of the ar
50 ticle and coordinated with the shape of the folder
so that the form of fold desired will be made dur
ing the withdrawal of the folder from the article
rather than during its approach towards the ar
ticle as in the usual case.
In the accompanying drawing I have illus
(Cl. 93——2)
trated one embodiment of my invention in con
nection with those parts of a conventional tum
ble box type of gum wrapping machine, showing
only such parts of the latter as are necessary to
an understanding of the invention.
5
Fig. l is a side view showing a tumble box,
transfer device and end folder according to my
invention;
'
Fig. 2 is a top plan view of the structure shown
in Fig. 1, the tumble box being omitted;
10
Fig. 3 is a view looking from the left of Fig. 1.
the tumble box being omitted;
Fig. 4 is a fragmentary view similar to Fig. 1
with the end folder removed to show the relative
positions of the tumble box, transfer device and 15
article at the start of the end folding operation;
Fig. 5 is a plan view of the structure of Fig. 4
showing the end folders in‘ their position at the
start of the folding operation;
Fig. 6 is a view similar to Fig. 5 but showing 20
the position of the parts as the end fold is be
ing completed;
Fig. '7 is an end view of the partially wrapped
article after the end fold has been completed;
.
Fig. 8 is a bottom view of the completely 25
wrapped article;
‘
Fig. 9 is a section of the folding member sub
stantially on line 9—9 of Fig. 5;
Fig. 10 is a modi?cation showing additional
end folding members associated with the tum- 30
ble box; and
Fig. 11 is a bottom view of a completely
Wrapped article in the production of which the '
modi?cation of Fig. 10 has been employed.
Referring to the drawing, l0 indicates frame 35
members of the wrapping machine which form
the support for the various wrapping members
and their operating means. As shown, these
comprise a tumble box H and a ?ngered trans
port device l2, both of conventional form, the 40
latter being given a generally circular or ellipti
cal movement, as indicated by the arrow in Fig. 1,
to transfer the partially wrapped articles from
the tumble box into the folding channel I3
,_
formed by top plate I4 and rails l5.
4°
The end folders comprise ?ngers l6 pinned
or otherwise secured to vertical shafts l'l jour
naled in bearings I8 secured as by machine bolts
I9 to a bracket 20 supported from the outer 50
frame member Ill. The lower ends of shafts I‘!
are provided with bevel gears 2| engaging bevel
gears 22 pinned to a horizontal shaft 23. Shaft
23 is journaled in a bearing 24, positioned be
tween gears 22 and secured to bracket 20, and 55
2
2,182,546
' extends through bearings formed in frame mem
Intermediate the frame members In the shaft
23 is provided with an arm 25 pivotally connected
to an arm 26 extending from a strap 21 engaged
around an eccentric 28 mounted on a shaft 23.
Collars 30 secured to shaft 29 keep the strap
on the eccentric. Shaft 28 is constantly rotated
by means of a sprocket 3i and chain 32 from a
10 source of power notrshown, in properly timed
relation to the movements of the tumble box and
the transport device.
‘
As will be obvious, rotation of shaft 29 will
impart through eccentric 28 and linkage 28-25
15 an oscillating movement to shaft 23 which is
transmitted through gears 22--2| and shafts I‘!
to the ?ngers Hi to oscillate the latter between
the full and dotted line positions of Fig. 2.
The parts are timed so that when the ?rst fin
20 gers of the transport device i 2 are in the posi
tion shown in Figs. 1, 2, 4, and 5, and are ready
to transfer the partially wrapped article 35 from
the tumble box, the ?ngers i6 are at their ex
treme inward position as best shown in Figs.
25 2 and 5, and are positioned immediately in front
of the extending tubular wrapper portions 36.
The ?ngers 16 start their outward swing sub
stantially simultaneously with the forward move
ment- of the transport ?ngers. The speed of
30 shaft 29 and the character of the eccentric 28
are such that the forward movement of ?ngers
I6 is slower than the forward movement im
parted to the article by the transport device ‘with
the result that ?ngers l6 engage the leading
edge of the tubular wrapper extensions 36 and
form a tuck or fold 31 therein. The fold 31
partakes of the character of a bellows fold due
to the fact that while ?ngers I 6 are retreating
before the advancing article they are also simul
40 taneously being drawn outwardly from the path
of the wrapper. The forward and outward com
ponents of the ?nger movements in the form
shown have a resultant pivotal movement.
I claim:
' 1. In
bers l0.
The
desired folding operation is accomplished with
45 out in any way changing or altering the normal
movement of the article and the fold is made
more gradually and with less tendency to tear
the wrapper thanvwould be the case if the fold
ing members were stationary at the time the fold
50 was made or if the folders were moving to meet
the article. The movement of the folder is co
ordinated with its contour and cross-sectional
shape so that the tuck desired will be formed
easily and to the ?nal form desired while exert
C1 (it ing the least ‘possible disturbing action upon the
wrapper.
After passing the folders I6 the tucked out
standing end portions 36 are folded around
against the face of the article as shown in Fig.
8 by any suitable folding means and it will be
noted that due to the infold 31 the edge 38 of
the wrapped article is smooth from end to end
and without projecting portions such as appear
at 39 at the untucked side.
In some cases, particularly when the article
is of substantial width, such as that shown at
4|! in Fig. 11, it is desirable to form tucks at both
sides of the article. To accomplish this I place
?ngers 4| (Fig. 10) at the ends of the article re
ceiving slots 42 of the tumble box which form
a wrapping
machine which includes
means for advancing a partially wrapped article
with a tubular portion of the wrapper extending
outwardly from an end thereof transversely to‘
the direction of its movement, a folding member
positioned to engage the leading side of said ex
tending wrapper portion as the partially wrapped
article is advanced, and means to'gradually with
draw said folding member, transversely, from the
l)
path of the extending wrapper portion during
the advance of the article while maintaining the
moving member in contact with the wrapper to
progressively form a fold therein as the member~
is withdrawn.
2. In a wrapping machine which includes
means for advancing a partially wrapped article
with a tubular portion of the wrapper extend
ing outwardly from an end thereof transversely
to the direction of its movement, a folding mem 20
ber positioned in the path of said extending tu
bular portion of the wrapper as the article ad
vances, and means to move the folding member
to withdraw it from the path of- the extending
portion of the wrapper during the continued ad
vance of the article, a component of said with
drawing movement being in the direction of ad
vance of the article and having a slower speed _
in said direction than the speed of the article
whereby the extending tubular portion of the 30
wrapper will be folded by said folding member
during the withdrawing movement of the fold
ing member.
3. In a wrapping machine which includes
means for advancing a partially wrapped arti
cle with a tubular portion of the wrapper ex~
tending outwardly from an end thereof trans
versely to the direction.of its movement, a fold
ing member pivotally mounted adjacent the path
of movement of the article, and means to swing
the folding member about its pivot from a po
sition in the path of said extending wrap
per portion to a position outside of said path,
said pivotal movement of the member being
in the direction of, and at a slower rate than, 45
the movement of the article whereby the
so moving folder engages the leading edge of the
extending wrapper portion to form a fold therein.
4. In a wrapping machine which includes a
tumble box for receiving an article and wrapper
to apply the wrapper about the article with a
tubular portion of the wrapper extending out
wardly from the ends thereof, relatively station
ary folding members secured to the ends of the
tumble box in position to form a fold in the
edge of the extending wrapper portion seated in
the tumble box, means for moving the partially
wrapped article from the tumble box, movable
folding members positioned to engage the lead
ing sides of said extending wrapper portions as (1.’)
the article is moved from the tumble box, and
means to gradually withdraw said movable fold
ing members, transversely, from the path of the
extending wrapper portions during the advance
of the article while maintaining the moving fold
ing members in contact with the wrapper to
progressively form a fold therein as the member
is withdrawn.
'
ii. In a wrapping machine which includes
means for advancing a partially wrapped arti
cle with a portion of the wrapper extending out
the tucks 43 as the articles and wrappers are
wardly therefrom transversely ‘to the direction
seated in the slots. The tucks 31 in the wrapper
of article 40 are made by folders i6 as previously
of its movement, a folding member positioned
to engage the leading side of said extending
wrapper portion as the partially wrapped article 75
described.
2,182,548
is advanced, and means to withdraw said fold-
in; member, transversely, from the path of the
extending wrapper portion during the advance
of the article while maintaining the moving
5 member in contact with the wrapper to form
a fold therein as the member is withdrawn, the
3
contour and cross-sectional shape of the folder
being so coordinated with its movement‘ that the
fold will be formed progressively and without
substantial disturbing force exerted on the wrap
per.
ELMER LOVELL SMITH.
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