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Патент USA US3028807

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April 10, 1962
_
F. J. BAYLEY ET AL
3,028,797
MACHINES FOR FOLDING BLANKS
Filed Oct. 5, 1959
4 Sheets-Sheet 1
April 10, 1962
F. J. BAYLEY ET AL
3,028,797
MACHINES FOR FOLDING BLANKS
Filed Oct. 5, 1959
4 Sheets-Sheet 4
14
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United States Patent O??ce
3,028,797
Patented Apr. 10, 1962
1
2
parts of the material of the slit sides overlying the tongues
3,028,797
to deform the tongues.
The tongues may be of such shape and size in relation
MACHINES FOR FOLDING BLANKS
Frederick J. Bayley and Lawrance E. Nichols, London,
to the slits that they are only partially freely enterable
into the slits whereafter the tongues have to be deformed
in order that they may be pushed through the slits. This
Engiand, assignors to Pembroke Carton & Printing Co.
Ltd, London, England, a company of Great Britain
Filed Oct. 5, 1959, Ser. No. 844,451
Claims priority, application Great Britain Feb. 26, 1959
10 Claims. (Ci. 93-51)
ensures that once the tongues are entered through the
slits they are positively locked in the slits to hold the box
erect.
This invention relates to box blank erecting machines 10 For erecting blanks having these “interfering” tongues
for making boxes which may be in the form of trays, and
in a machine according to the present invention the pro
concerns box blank erecting machines of the die-plunger
vision of the tongue deforming means de?ned above is
type for erecting blanks of the kind (hereinafter referred
essential. When the blank is forced into the die by the
to as of the kind described) comprising a ?rst pair of
plunger part, following the slit opening operation, the
opposite side forming portions (the ?apped sides) each
15 tongues enter the slits to the extent to which they are
having a pair of ?aps one at each of its side edges, and a
freely enterable therein, whereafter according to a fea
ture of the invention the tongues are deformed by the
second pair of opposite side forming portions (the slit
sides) each having a pair of slits each to receive a tongue
on one of the adjacent ?aps to hold the sides of the box or
tray erect.
By a machine of the “die-plunger’? type will be under
stood a machine comprising a plunger having generally
projectable and retractable members to push them in
wardly through their slits, the slit sides being supported
20 by the plunger, and each tongue being deformed against
rectangular sectioned plunger part which, in use of the
an edge of its slit.
Alternatively, the tongues may be of such shape and
size in relation to the slits as to be free to pass right
machine, is forced into a corresponding die aperture to
into the slits Without interference.
fold opposite pairs of side forming portions of a blank into 25 For erecting blanks having “non-interference” tongues
a position upstanding from the base portion of the blank.
the provision of the tongue deforming means is not es'sen
For erecting a blank of the kind described it is known
tial. Nevertheless the'provision of such means is ad
to provide such machines with means for opening the
vantageous because it also locks the tongues in the slits.
slits in the slit sides to receive the tongues of the flaps on
Thus, according to an alternative feature of the present
the ?apped sides.
30 invention, the tongues may be deformed by said project
The object of the present invention is to provide a ma
able and retractable members to bend them inwardly
chine of the die-plunger type having improved slit open
ing means.
after they have been fully entered into their slits, the
slit sides being supported by the plunger part and the
According to the present invention the slit opening
tongues being deformed each against the edge of a recess
means comprises a plurality of ?ngers, one for each of 35 in the opposing wall of the plunger part.
the slits, means for moving the ?ngers from an inopera
According to a still further optional feature of the pres
tive position in which they lie clear of the path of move
ent invention the machine may include a pair of project
ment of the side forming portions of the blank when they
able and retractable levers in each slit side erecting Wall
are upfolded by the machine, into engagement with the
of the die, the levers having foot portions engageable by
?at blank while it is supported on a support surface above 40 the base portion of the blank to project the leversinto
the die aperture and, in co-operation with said surface,
engagement with the erected slit sides of the blank out‘
permanently deform the blank and open the slits, and
means for returning the ?ngers to their inoperative posi
tion in advance of the upfolding of the side forming por
tions.
Preferably the moving means is operated by movement
of the plunger towards the die, whereafter the plunger
clears the moving means to release the ?ngers for return
to their inoperative position by the returning means.
wardly of the slits and, in co-operation with the plunger
how the slit sides to facilitate the entry of the tongues into
the opened slits.
A practical application of the present invention will
now be described, merely by way of example with ref
erence to the accompanying drawings in which:
FIG. 1 is a cross-section on line 1-—-1 of FIG. '2 of
a machine according to the present invention for erecting
I Preferably also the ?ngers are returned to their inop 50 blanks of the kind described and having tongues which
erative position by spring means.
are an “interference” ?t in the slits,
The slits in the slit sides of the blanks may de?ne cars
FIG. 2 is a cross-section on line 2——2 in FIG. 1, f
which are foldable along a straight line outof the plane
FIG. 3 is a partial View in the direction of arrow 3 in
of the blank to open the slits, and in this case, according
to a feature of the present invention said support surface 55
may have recesses which lie one beneath each of the ears
of such a blank positioned on the surface with one edge
of the recess extending along the intended fold line of
the ear, and the ?ngers are then arranged to engage the
ears and bend them across said edges into the recesses
thereby to fold the ears out of the plane of the blank.
FIG. 2 and showing certain details of the operation of the
machine,
.
'
a
FIG. 4 is a partial plan view of the machine showing
a stage in the erection of a blank in the die of the ma
chine,
‘
FIGS. 5 and 7 are partial cross-sectional plan views
showing further stages in the erection of the blank,
FIG. 6 is a view in the direction .of ‘arrow 6 in FIG, 5,
Following the operation of the slit opening means, the
H6. 8 is a plan view showing one end of a blank
plunger part engages the base portion'of the blank and
which may be erected in the machine, it being understood
forces the blank into the die aperture to fold the blank,
that the blank is correspondingly shaped at the other
the tongues being entered into the opened slits during the 65 end, and
folding action.
FIGS. 9 and 10 show in partial cross-section the blank
According to a further feature of the present inven
tion the machine may include projectable and retractable
at two different stages of its erection in the machine.
Referring to the drawings, the machine is of the
members in the die wall each for deforming one of the
“die-plunger” type ‘and comprises a plunger 9 having
tongues after the tongues have been entered into the slits, 70 generally rectangular sectioned plunger part 10, which,
and operating means actuable by movement of the plung
in use of the machine is forced into a corresponding die
er’ to project the members into engagement with those
11 to ‘fold opposite pairs of side forming portions of a
3
blank into a position upstanding from a base portion of
the blank.
The die 11 is supported from the machine frame 12
which also carries the plunger 9 in a manner permitting
reciprocation of the plunger part into and out of the
die. Spring means (not shown) are provided urging the
plunger to its uppermost position (as shown in FIGS. 1
zmd 2), and in the present example a pneumatic cylinder
(not shown) for driving the plunger downwardly into
4
secured to an angle sectioned frame member 30, the mem
ber 30, the rods 28 and the arms 27 constituting a com
mon frame 31 carrying the ?ngers 26. The frame 31 is
supported by the cross beam 29 for vertical rectilinear
movement, to move the ?ngers rectilinearly to and from
an inoperative position as shown in FIGS. 1 and 2 into
and out of the recesses 25 with which the ?ngers are
aligned. Thus the frame 31 is mounted to slide on rod
slides 32 bolted to the lower ?ange of the cross beam and
the die. Alternatively, the plunger may be manually 10 extending upwardly through holes in the upper ?ange of
the cross beam and holes in the frame member 30. Spring
operated in the downward direction.
means in the form of open coiled springs 33 is provided,
The machine is designed for erecting blanks of the
one on each of the rod slides 32, and engaged between the
lower
?ange of the cross beam and the frame member 30.
site side forming portions 13 (the flapped sides) each
The springs 33 constitute returning means for return
having a pair of ?aps one of which is shown at 14, one 15
ing the ?ngers 26 to their inoperative position which is
at each of its side edges, and a second pair of opposite
governed by the collars 34 on the rods 28 which come
side forming portions (the slit sides) one of which is
up against the underside of the upper ?ange of the cross
shown at 15, each having a pair of slits 16 one adjacent
beam 29.
each of its side edges for receiving a tongue 17 on the ad
jacent ?ap 14. The tongues 17 are of such shape and 20 Upstanding from the cross-beam is a pillar 35 which
carries a rocker arm 36 having a roller 37 to engage the
size in relation to the slits 16 that they are only partially
frame member 30. The rocker arm constitutes moving
freely enterable into the slits, as shown in FIG. 6, where
means for moving the ?ngers 26 from their inoperative
after the tongues have to be deformed in order that they
position into engagement with the ears 18 of a blank
may be pushed through the slits.
positioned on the surfaces 20, and is operated by move
Each slit 16 defines an ear 18 which is foldable along 25
ment of the plunger 9 towards the die 11. T0 this end
a straig.t line 19 (see FIG. 9) out of the plane of the
the plunger carries a trip member 38 to engage a cam
blank to open the slit for the introduction of the ad
39 on the rocker arm. Referring to FIG. 3, as the
jncent tongue 17.
plunger descends the trip member comes into engagement
To erect a blank as just described, the flaps 14 are
with the upper surface of the cam 39 and rocks the arm
30
passed around the outside of the slit sides 15 as shown
36 clockwise whereby the roller 37 rolls along the frame
in FIG. 6 and the tongues 17 are entered one into each
member 30 at the same time forcing the frame 31 down
of the slits 16 to the extent to which they are freely en
wardly against the action of the springs 33. Just after
terable therein also as shown in FIG. 6.
the arm 36 reaches its position shown in chain dotted
The tongues are then deformed so as to pass them
lines in FIG. 3 the trip member 38 runs off the nose of
inwardly through the slits as shown in FIG. 10, whereby 35 the cam 39 and clears the cam thereby releasing the frame
the box is locked in its erected position.
31 so that the springs 33 become free to return the frame
The blank shown in FIG. 8 is erectable to form a box
31 and therefore the ?ngers 26 to their inoperative posi
kind shown in FIG. 8 and comprising a ?rst pair of oppo~
having a lid, the lid being constituted by the extended
portion 19 on the left hand ?apped side 13 in the draw
ing.
If the extended portion is omitted the blank of
FIG. 8 is erectable to form an open topped tray.
In order to erect the blank in the machine, the blank
is laid on a support surface above the die aperture, the
support surface being constituted in the present example
by the upper surfaces 20 of the die, with the base forming ,
portion 21 of the blank squarely over the die aperture.
tion.
The length of the ?ngers 26 is such that at the limit of
the downward movement of the frame 31, the ?ngers
penetrate into the recesses 25 as shown in chain dotted
lines in FIG. 3, the ?ngers applying pressure to the ears
to bend the ears and open the slits as above described.
It is arranged that the ?ngers 26 engage the ears more
or less centrally as shown in FIGURE 9. Each ?nger
has a flat foot 40 at its extremity to engage the ear over
The blank is properly located in this position by stops
a relatively large area. This avoids marking the blank
24 and the rear and side walls 22 and 23 respectively of
by the impact of the ?ngers. Each foot 40 is generally
the machine frame 12 all of which engage the edges of
rectangular in shape and has one edge aligned with the
the blank so as properly to position the blank.
60 fold line of the ear and spaced only a small amount from
The surfaces 20 have recesses 25 (see FIGS. 1 to 4)
the edge 26 of the recess. The undersurface of the foot
which lie one beneath each of the cars 18 of the blank
may taper so that the foot ?rst engages the ear adjacent
with one edge 25a (see FIG. 4) of the recess extending
the slit, the area of contact between the foot and the
along the intended fold line 19 of the ear. Conveniently
ear increasing as the foot penetrates into the recess and
the recesses 25 are of the same shape and slightly larger 55 folds the ear.
than the ears as shown in FIG. 4 where the chain dotted
The ?ngers 26 may simply be rods, i.e. without feet
lines represent the out-line of the ears.
if desired, or again the ?ngers may be in the form of
With this arrangement it will be appreciated that a.
relatively narrow plates which are brought to engage the
downward pressure applied to the ears 18 forces the ears
e?rs along a part of the length of the slits near to the
into the recesses 25 as shown in FIG. 3 so that the ears 60 s ts.
are bent across the edges 25a of the recesses and the ears
are folded out of the plane of the blank thereby to open
the slits 16.
This folding operation does not fold the ears greatly
out of the plane of the blank but is arranged to open the 65
ears to a minimum amount conditional upon the ears
being set permanently with the slits open.
The plunger descends rapidly and therefore the ?ngers
26 engage with the ears somewhat suddenly, the ?ngers
being thereafter rapidly returned to their inoperative
position by the springs 33. The ears are accordingly
punched open with a snap action.
After the trip member clears the cam 39 the rocker
arm is returned to its full line position as shown in FIG.
3 by the return movement of the frame 31, and the
In order to force the ears 18 downwardly into the
recesses 25, there is provided, for each ear, a ?nger 26,
plunger continues to descend, the plunger part 10 com
the pair of the ?ngers 26 associated with each slit side 70 ing into contact with the base portion 21 of the blank
15 of the blank being carried by an arm 27 mounted on
and forcing the blank into the die to erect the blank, the
the lower end of a rod 28 slidable in aligned holes in the
erected blank being discharged through the bottom of
?anges of a channel sectioned cross-beam 29 secured to
the die. As the blank is forced into the die by the plunger
the machine frame 12 above the die 11 and to one side
the slit sides 15 are ?rst erected by the opposing slit-side
of the plunger 9. At their upper ends the rods 28 are 75 erecting walls 42 of the die. Immediately following this,
5
3,028,797
the ?aps 14 ‘are bent up by the die wall portions 43 on
each side of the walls 42 as shown in FIG. 9. The ?apped
sides 13 of the blank are then erected by the ?apped
side erecting walls 44 of the die, the ?aps 14 passing
around the outside of the slit sides 15 and the tongue 17
of each ?ap entering its adjacent opened slit 16 as shown
in FIGS. 5 and 6.
To facilitate the passage of the ?aps 14 around the
outside of the slit-sides 15, and, in consequence, the
entry of the tongues 17 into the opened slits, a pair of 10
projectable and retractable pivoted levers 45 is provided
'6
behind each of the ears when the slit sides of the blank
are erected against the walls 49 as may be seen from FIG.
6. The recesses 52 accommodate the tongues 17 when
the tongues are deformed by the members 51.
The operating means for the members 51 comprises for
each member, a-pivoted lever 53, which as shown in
FIGS. 1 and 2 normally projects from the corresponding
slit side erecting wall $2 of the die so as to lie in the path
of movement of the base portion 21 of the blank. The
members 53. are in the form of pivoted ?ngers, and each
finger is connected with its operating lever by a link 54.
A spring 55 is provided connected with each link, the
springs 55 urging the fingers to their retracted position
in each slit side erecting wall 42 of the die each lever 45
being housed in an open topped recess 46. Each lever 45
has a foot portion 47 which norm-ally projects from the
as shown in FIG. 1.
die wall so as to lie in the path of movement of the 15
In the position shown in FIGS. 5 and 6, the base por
base portion 21 of the blank as it is forced into the die
tion of the blank is just engaging the operating levers 53.
by the plunger 10.
Continued downward movement of the plunger from this
The foot portions 47 project from the die Walls when
position forces the levers 53 downwardly about their
the levers 45 are in their retracted position as shown in
pivots thereby to swing/the ?ngers 31 downwardly firstly
FIGS. 1 and 2, and the levers are urged to their retracted 20 into engagement with'the cars 18 as somewhat diagram~
positions by springs 48.
matically illustrated in FIGS. 5 and 6, and then ‘to press
The slit side backing walls 49 of the plunger part 10
the ears inwardly into the recesses 52 to bow the tongues
(ie the walls opposing the slit side erecting walls 42 of
117 against the upper edges of the slits 16 and tuck the pro
the die) are generally rearwardly inclined to a small
jecting portions 56 of the tongues through the slits as
extent and are slightly bowed from side to side as shown 25 illustrated in FIG. 7.
in FIG. 4.
The base portion of the erected blank then clears the
When the blank is forced into the die by the plunger,
the base portion 21 of the blank engages the projecting
foot portions 47 on the levers 45 and forces the foot por
levers 53 and the erected blank with its sides fully lockedv
in position is ejected through the bottom of the die.
a An open ended channel 57 is provided in the plunger
tions into therecesses 46 thereby to project the levers 45 30 part Iii opposite each of the levers 53 to accommodate the '
into engagement with the erected slit sides of the blank.
levers to allow the plunger to be withdrawn from the die
Each pair of levers 45 engages the adjacent slit side out
past ‘the levers.
"
wardly of the slits on both sides, and as the plunger con
The foot portions 47 on the levers 45, unlike the levers
tinues to move through the diefthe slit-side is pushed
53 do not project far enough into the die to interfere
inwardly towards each of its side edges so that it is 35 with the plunger as it is withdrawn from the die, and no
bowed in conformity with the opposing wall of the plunger
channels corresponding with the channels 57 are neces
part It}.
I
sary to accommodate the foot portions during the with
This is illustrated in FIG. 4 which shows the levers 45
drawal of the plunger. Instead the undersurfaces of the
at maximum projection pushing the slit side against the
foot portions are shaped so as to ride over the lower edge
bowed'wall of the plunger part.
40 of the plunger part It}, the levers '45 rocking to allow the
By bowing the erected slit sides, the ?aps 14 are more
upward passage of the plunger.
easily able to pass round the outside of the side edges of
Towards the end of the return movement of the plunger,
the slit sides as is required.
'
The levers 45 are positioned at the top of the slit
the trip member engages the undersurface of the cam 39
on the rocker arm 36 and moves the rocker arm anti
side erecting walls 42, and act to bow the slit sides before 45 clockwise in FIG. 3 to its dotted line position whereafter
the ?apped sides are erected su?iciently for the ?aps 14
the trip member runs off the nose of the cam and the
to begin to overlap the slit sides.
rocker arm falls back to its full line position. A sponge
As the plunger continues to descend the erected ?aps
rubber pad 58 silences the fall of the rocker arm. For a
at each end are advanced between the bowed slit side
similar purpose rubber pads 59 are provided on the stops
and the projecting levers 45 by the erection of the ?apped 50 34 to silence the return of the frame 31 under the action
sides 13. The levers 45 have rounded side faces 50 which
guide the ?aps edge-on towards the opened slits 16 and
of the springs 33.
.
In their inoperative position, as shown in FIGS. 1 and
the tongues 17 on the ?aps into the slits to the full extent
2 the ?ngers 26 are raised clear of the path of the slit
to which they are freely enterable therein.
sides when these are upfolded by the plunger in the die.
This condition is illustrated in FIG. 4.
55
The return movement ofv the frame 31 to carry the
Once the tongues 17 have been fully entered into the
?ngers 26 back to their inoperative position is sufficiently
slits in this way it is necessary that the tongues be de
rapid to return the ?ngers in advance of this vupfolding
formed in order that they may be pushed through the slits
operation so that the ?ngers cannot interfere with the
to lock the blank in its erected position. To this end the
slit sides as they are folded up.
machine further comprises tongue deforming means in
The machine as described may equally as well be used
the form of projectable and retractable members 51 in
for erecting blanks of the kind described, and in which
the slit side erecting walls 42 of the die, and operating
the tongues on the ?aps are of such shape and size as to
means for projecting the members into engagement with
be free to pass right into the slits without interference.
those parts of the material of the slit sides 15 overlying
In this case the ?ngers 51 act to deform the tongues after
the tongues 17 to deform the tongues and push the tongues 65 they have been fully entered in the slits, to bend the
inwardly through the slits 16.
tongues inwardly so that they are locked in the slits.
The tongues are deformed each by one of the projectable
In this case the slit sides of the blank are supported by
members 51 against an edge of its slit. To deform the
the slit side backing walls of the plunger part 10 and the
tongues in this way, the slit sides have to be supported
tongues are deformed each against the edge 59 (see FIG.
against inward movement, and yet the tongnes must be 70 6) of the recess 52 lying beneath the tongue.
free to deform inwardly in order to pass through the slits.
The means described for bowing theslit sides of-the
To this end the slit side backing walls 49' of the plunger
blank during its erection are not regarded as essential to
part 10 are provided with recesses 52 which are of the
the proper operation of the machine. These means could
same shape but a little larger than the upper part of the
be omitted if desired.
ears 18. The recesses 52 are positioned so as to lie one 75
Also, for erecting blanks having non-interfering
3,028,797
7
8
spring means comprises an open coiled spring on each
of the rod slides and engaged between the cross-beam
tongues the tongue deforming means could be omitted
if desired.
What we claim is:
l. A box blank erecting machine comprising a plunger
having a generally rectangular sectioned plunger part, a
die having a die aperture corresponding with the plunger
and the frame.
7. A machine as claimed in claim 6, wherein the rod
slides are ?xed to the cross beam and the frame is
mounted to slide on the rod slides.
8. A machine as claimed in claim 6, wherein the frame
comprises rods slidable in apertures in the cross beam.
9. A machine as claimed in claim 1, wherein the ?n
part, means for forcing the plunger part into the die
aperture to fold opposite pairs of side forming portions
of a ?at box blank into a position upstanding from a base
portion of the blank, a plurality of movable ?ngers one 10 gers have ?at feet at their extremities to engage the blank
over a relatively large area.
'
for each of a pair of slits in each of a pair of opposite
10. A box blank erecting machine comprising a plunger
side forming portions of the blank, means providing a
having a generally rectangular sectioned plunger part, a
support surface for supporting the ?at blank above the
die having a die aperture corresponding with the plunger
die aperture with the material of the blank adjacent at
least one side of each slit unsupported by said support 15 part, means for forcing the plunger part into the die aper
ture to fold opposite pairs of side forming portions of a
surface, means operable to move the ?ngers from an in
?at box blank into a position upstanding from a base por
operative position in which they lie clear of the path of
tion of the blank, a plurality of movable ?ngers one for
movementof the side forming portions of the blank
each of a pair of slits in each of a pair of opposite side
when they are upfolded by the machine, into engagement
with the blank alongside each slit in the blank on an 20 forming portions of the blank, the slits de?ning ears
which are foldable along a straight line out of the plane
unsupported side of the slit while the blank is supported
of the blank to open the slits, means de?ning a support
on said support surface permanently to deform the blank
surface for supporting the ?at blank above the die aper
and open said slits, and means for returning the ?ngers
ture, said support surface having recesses which lie one
to their inoperative position in advance of the upfolding
25 beneath each of the ears with one edge of the recess ex
of the side forming portions.
tending along the intended fold line of the ear, means
2. A machine ‘as claimed in claim 1, wherein a mem
operable to move the ?ngers from an inoperative position
ber movable with the plunger engages the moving means
in which they lie clear of the path of movement of the
to operate the moving means as the plunger moves to
side forming portions of the blank when they are up
wards the die, whereafter the member dis-engages the
folded by the machine into engagement with the ears to
30
moving means to release the ?ngers for return to their in
bend the ears across said edges into the recesses thereby
to fold the ears out of the plane of the blank, and means
operative position by the returning means.
3. A machine as claimed in claim 2, wherein the ?n
for returning the ?ngers to their inoperative position in
advance of the upfolding of the side forming portions.
gers are returned to their inoperative position by spring
means.
4. A machine as claimed in claim 1, wherein the ?n 35
gers are moved rectilinearly by said moving means and
by said returning means.
5. A machine as claimed in claim 4, wherein the ?n
gers are carried on a common frame which is supported
for rectilinear movement by a cross-beam, and the mov 40
ing means comprises a rocker arm on the cross beam
rockable by a trip member on the plunger to move the
frame.
6. A machine as claimed in claim 5, wherein said frame
is supported from said cross beam on rod-slides, and said
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,627,791
2,743,651
2,819,660
2,864,287
2,919,633
Ringler _____________ __ Feb. 10,
Wilcox _____________ __ May 1,
Johnson _________ __‘_..__ Jan. 14,
Johnson et al __________ __ Dec. 16,
Pierce ________________ __ Jan. 5,
1953
1956
1958
1958
1960
FOREIGN PATENTS
45
585,145
Germany ____________ .._ Sept. 29, 1933
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