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Патент USA US3038399

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June 12,- 1962
l5 Sheets-Sheet 1
Filed March 6, 1959
Edward J. Pagendarm
June 12, 1962
Filed March 6, 1959
15 Sheets-‘Sheet 2
Ec/wa ra’ J. Page” dam?
June 12, 1962
Filed March 6, 1959
l5 Sheets-Sheet 3
Edward J. Pagendarm
June' 12, 1962
Filed March 6, 1959
l5 Sheets-Sheet 4
Edward J Pagendarm
June 12, 1962
Filed March 6, 1959
15 Sheets-Sheet 5
Edward J. Page/1 dqrm
June 12, 1962
Filed March 6, 1959
l5 Sheets-Sheet 6
Edward J. Pagendarm
14W W
June 12, 1962
Filed March 6, 1959
15 Sheets-Sheet 7
Edward J Pagendarm
June 12, 1962
Filed March 6, 1959
- l5 Sheets-Sheet 8
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Edward J Pagenc/arm
June 12, 1962
Filed March 6, 1959
15 Sheets-Sheet 9
Edward J. Pagendafm
June 12, 1962
Filed March 6, 1959
l5 Sheets-Sheet 10
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Edward J Pagendarm
June 12, 1962
Filed March 6, 1959
15 Sheets-Sheet 11
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Edward J. Pagen?'arm
June 12, 1962
Filed March 6, 1959
15 Sheets-Sheet 12
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Edward J. Pagendarm
June 12, 1962
Filed March 6, 1959
15 Sheets-Sheet 13
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£61’ ward J Pagendarm
June 12, 1962
Filed March 6, 1959
15 Sheets-Sheet 14
Edward J. Pagendarm
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Julie 12, 1962
Filed March 6, 1959
'15 Sheets-Sheet 15
Edward J. Pa?ena’arm
ilnited States Patent 6 ”ll Q6
Edward J. Pagendarm, San Mateo, Calif, assignor, by
mesne assignments, to Atlas General Industries, Inc.,
a corporation of Massachusetts
Filed Mar. 6, H59, Ser. No. 797,638
34 Claims. (Cl. 93--51)
Patented June 12, 1962
The invention permits use of very fast drying adhesive
compositions by depositing the adhesive in slow drying
drop or bead form, rather than as a quick drying thin
?lm exposed to air. The drops or beads are converted
into the form of a thin ?lm by contact of the surfaces
which are to be adhesively secured. This contact takes
place under high pressure and causes the deposited quan~
tity of adhesive to be spread out as a thin ?lm.
The present invention permits the time between the
This invention relates to the art of making folding 10 application of the adhesive vand the actual formation of
boxes by folding an ‘appropriately shaped box blank and
the glue ‘bond to be made extremely short, of the order
adhesively securing certain of its poritons together in box
forming position.
Conventional box making machines comprises basically
a conveyor which moves an initially ?at box blank past
adhesive applying and folding devices, whereafter the box
passes into a pressure section in which the glued portions
are maintained under pressure until the adhesive bond has
become su?iciently strong to permit the box to be dis
charged from the machine. These machines are rela
tively extended and occupy a large amount of ?oor space.
It has been proposed to reduce the length of the box
making machine by use of a box folding mechanism of
of a ‘fraction of a second. The high compressive force
which is applied to the glue bond produces a very thin
glue ?lm between the surfaces to be adhered. Such a
film sets almost instantly and permits the box to be dis
charged immediately thereafter. This, in turn, results
in a high productive rate.
Preferably the step of applying adhesive is combined
with the step of prefolding the blank. This permits the
adhesive applicator to be constructed as a portion of a
prefolding mechanism against which the ?at blank is
moved. The transport of the blank may be accomplished
by a combination feeder and plunger which comes to rest
sufficiently long to permit a pattern of adhesive to be ap
conveyor portion ?anked by prefolding mechanism and 25 plied to a stationary blank. Preferably a feeder is em
glue wheels. In the known machines one purpose of
ployed which is distinct ‘and separate from the plunger
the prefolding mechanism is to move certain portions
which subsequently forms the box. In the preferred ar
of the box blank ‘out of engagement with the glue wheels
rangement the blank is moved into the path of the plunger
and another purpose is to prepare the blank for the sub—
by the blank feeder which then releases the blank so
sequent folding operation performed in the plunger and
that the blank comes to rest for a brief moment during
the plunger and die type, preceded ‘by a conventional
die mechanism.
which the adhesive pattern is applied far more accurately
Adhesive applicators of the wheel type have numerous
than if the blank were in motion.
disadvantages, among which may be mentioned the ten
The invention further makes possible an arrangement
dency of the wheels to pick up board dust, which is ever
for discharging adhesive only when a blank is present,
present in a box plant, and necessitates frequent clean 35 so that the discharge of adhesive is suspended when the
ing of the glue applicator. Glue Wheels exposed the
supply of blanks is interrupted.
adhesive to the atmospheric air by reason of the large
At ?rst impression it would seem a simple matter to
surface of the adhesive coated area of the wheel and,
accomplish this by installing a device responsive to the
as a consequence, the adhesive oxidizes and deteriorates
rapidly. The nightly shut-down of the machine causes
portions of the glue wheels to dry up, a disadvantage
which is noticeable even after relatively brief shut-down,
such as the lunch hour shut-down of the machine.
Conventional glue wheels generally apply the adhesive
presence of a blank at the station where adhesive is to
be applied, in the present case the mouth of the folding
die. In ‘actual practice, however, this is not practicable
in a rapidly operating machine because the time is not
sufficient to render the adhesive applicator effective or
ineffective once the blank has arrived at the mouth of the
in strip form from one outer edge of the ?ap or panel
to ‘which the adhesive is applied to the opposite edge.
This is normally not disadvantageous where there is a
substantial lapse of time between the applicataion ‘of the
adhesive and the application of pressure in the pressure
section, and where the pressure is neither severe nor
control signal is developed during the feeding of the blank
applied so suddenly that the adhesive near the edges of
the blank or panel is squeezed out beyond the edge of the
In a machine of the plunger and die type, however, a
relatively great compressive force is applied rather sud
denly by contraction of the die, resulting in squeezing
of adhesive beyond the edge of the flap or panel, thereby
soiling the ‘box ‘and the die. Adhesive deposited on the
die surfaces interferes with the operation of the machine
and necessitates periodic shut-down of the machine for
cleaning purposes.
The present invention permits a box folding and glu
ing machine to be built of very compact size requiring a
floor space of the order of ?ve by ?ve feet.
The moving parts of the control mechanism have
a certain mass and present acceleration and inertia prob
lems which do not permit ‘actuation in response to a
signal developed at the mouth of the die.
According to one aspect of the present invention a
by the mechanism which transports the blank from the
magazine to the die. Here a problem is encountered
due to the fact that the blank feeder has actually released
the blank at the moment adhesive is to be applied. The
blank feeder itself therefore is in the same condition at
that moment as if no blank had been fed during the pre
ceding cycle. According to the present invention the sig
nal is derived prior to the application of the adhesive and
is then stored until after release of the blank by the feeder.
This arrangement leaves su?icient time for the mecha
nism which controls or operates the adhesive applicator
to be moved into an operative or inoperative position de
pending on the presence or absence of .a blank on the
feeder prior to the arrival of the blank at the mouth of
Folding and compression of the box is accomplished 65 the die.
by a plunger and die mechanism into which the ?at
These and various other features and advantages of
blank is fed. A measured quantity of adhesive is ‘ap
the invention will appear more fully from the detailed de
plied to the blank in a predetermined pattern, which is
scription which follows accompanied by drawings show
preferably so laid out that the adhesive is never squeezed
ing, for the purpose of illustration, a preferred embodi
beyond the edges of the ?aps or panels to be adhesively 70 ment of the invention. The invention also resides in cer
secured, even though the compressive force is very high
tain new and original features of construction and com
and is suddenly applied.
bination of elements hereinafter set forth and claimed.
Although the characteristic features of this invention
which are believed to be novel will be particularly pointed
out in the claims appended hereto, the invention itself,
its objects and advantages, and the manner in which it
may be carried out may be better understood by referring
to the following description taken in connection with the
accompanying drawings forming a part of it in which:
the belt 16 is taken up by moving the motor forward
towards the observer on the adjustable mount 13.
The pinion shaft ‘24) carries a pinion 21 meshing with
FIG. 5 is a perspective view of the blank feeder, the
plunger and the die of the machine and illustrates a phase
of the operation in which ‘a ?at blank approaches the
The crank 24 (FIG. 2) is further connected to an
oscillating lever 34 by an upper link 35. The oscillating
lever 34 is pivotally mounted to the framework inter
glue applying mechanism above the die;
mediate its ends at 36 and moves a connecting rod 37
which actuates a bell crank lever 38. The lever 38‘ is
tiltable on a ?xed pivot 39 on the framework and forms
an element of a blank feeding mechanism disclosed in
a large gear 22 on a crank shaft 23 carrying a crank 24
on either end. The crank is not visible in FIG. 1 but
shown in FIG. 2.
The mechanism about to be'described is mounted on
both sides of the machine and comprises a crank 24 con
FIG. 1 is a perspective view of a partially assembled
nected by a lower link 25 to a lower oscillating arm I26
machine for carrying out the invention;
2FIG. 2 is an elevational view of a portion of the drive 10 whose one end is pivoted to a plate 27 of the framework
at 25 and whose other end is pivotally connected to a
mechanism of the machine of FIG. 1;
connecting rod 29. The upper end of the connecting rod
FIG. 3 is a perspective view of the machine of FIG. 1
29 is pivotally connected to a cross head member 30 at
at an advanced stage of assembly showing the blank
31 (see FIG. 3). The cross head member 30 is vertically
feeder mechanism and a portion of the power mechanism
for contracting the die;
15 slidable on a vertical column 32 of the framework and
carries a plunger drive bar 33 extending across the front
FIG. 4 is a perspective bottom view of the power mech
of the machine.
anism of FIG. 3;
FIG. 6 shows the blank prefolded at a moment shortly
prior to the release by the feeder and prior to the applica
tion of adhesive;
FIG. 7 illustrates a later phase of the operation at 25 greater detail in the prior Patent No. 2,805,060 to Lefief,
which the plunger strikes the blank while the feeder ap
dated September 3, 1957.
proaches the magazine to pick up the next ‘blank;
Brie?y, the blank feeding mechanism comprises an
FIGS. 8, 9 and 10 illustrate successive stages of the
oscillating gripper bar 40 supported at both ends by identi
forming operation performed on the box, FIG. 10 show
cal lever mechanisms, more particularly a pair of double
ing the position in which the plunger as well as the oscil 30 armed gripper arms 41 pivoted at 42 to the ?rst bell crank
lating drive bar has reached its lowest position;
levers 38. The end of the gripper arm opposite the
FIG. 11 is a perspective view of a pneumatic actuating
gripper bar is formed as a track or guideway 43 of U
mechanism between the drive bar and the plunger proper;
shaped cross section within which a pivot 44 on one arm
FIG. 12 is a perspective view ‘of the drive mechanism
of a second bell crank lever 45 is both rotatable and free
of the machine including the actuator for the glue pump; 35 to slide longitudinally. The second bell crank lever 45‘
FIGS. 13, 14 and 15 illustrate different positions of
is pivotally mounted at 46 and its other arm 47 is linked
adjustment of the mechanism for interrupting the feeding
to a connecting rod 48 at 49.
The connecting rod 48
of adhesive, FIG. 13 showing a position in which adhesive
has its other end pivoted to the ?rst bell crank lever 38
is about to be fed, FIG. 14 showing the position in which
at 50.
adhesive is being fed and FIG. 15 showing a position in 110
The pivots 39 and 46 are supported by castings 51
which no adhesive is fed;
which form the sides of a substantially U-shaped frame
FIGS. 16 to 20 are diagrammatic illustrations of oper
work, viewed from above. The back of the framework
ating conditions under which adhesive is being fed and
is formed by a magazine supporting plate 52 whose ends
other conditions under which no adhesive is fed;
are bolted to the back of the castings 51. The U-shaped
FIG. 21 is a perspective view of the die with a box to. O1 framework is open towards the observer and has front
therein after withdrawal of the plunger;
FIG. 22 is an elevational view partly in section of a
hydraulic snubber; and
arms or extensions 53 adapted to support a box forming
die and box compression mechanism to be held in place
by knurled nuts 54.
FIG. 23 is a diagram of the electric circuit of the
FIGURE 1 shows further a motor-driven vacuum pump
50 55 from which a suction line 56 extends including flexible
In the following description and in the claims various
tubing leading to suction cups of the blank feeding mecha
details will be identified by speci?c names for conven
nism and other pneumatically operated elements of the
ience. The names, however, are intended to be generic
machine. The feeding mechanism is not yet installed
in their application. Corresponding reference characters
in the machine as shown in FIGURE 1, but portions of
refer to corresponding parts in the several ?gures of the
the ?exible tubing of the suction line are visible at 57
above the lever mechanism on the right as well as above
The drawings accompanying, and forming part of, this
the oscillating gripper bar 49 near the center. The
speci?cation disclose certain details of the invention for
of the illustrated mechanism will now be de
the purpose of explanation of its broader aspects, but
it is understood that the details may be ‘modi?ed in vari 60 scribed.
The motor 12 drives the driven pulley 17 at a speed
ous respects without departure from the principles of the
determined by the setting of the variable speed drive, and
invention and that the invention may be incorporated
the driven pulley 17 drives the pinion shaft 29 through
in other structures than the one shown.
the chain 18. The pinion 21, in turn, meshes with the
FIGURE 1 shows the machine in a state of partial as
sembly so that portions of the drive may be seen more
gear 22 and turns the crank shaft 23 carrying a crank 24
on either end (FIG. 2). The crank produces oscillation
The machine comprises a framework 11 sup
porting a motor 12 on an adjustable mount 13. The
mount 13 forms an element of a variable speed drive 14
of the lower oscillating arm 26 as a result of which the
cross head members 30 on either side, together with the
plunger drive bar 313 which connects them, move up and
whose other major element is a V-belt pulley 15 of vari
able effective diameter.
70 down.
A V-belt 16 extends over a driven pulley 17 carrying
Timed with respect to the motion of the plunger drive
bar is the motion of the oscillating gripper bar 40 which
a sprocket gear (not visible) from which a chain 18 ex
tends to a sprocket gear 19 on a pinion shaft 2t}.
in. the completed machine carries suction cups for picking
When the speed of the drive is reduced by reducing the
up flat blanks at a magazine and transporting them to a
effective diameter of the pulley 15 the resulting slack of 75 position above the forming die. The motion of the oscil~
lating gripper bar 40 is complex and is disclosed in detail
in the above mentioned Lefief patent.
Brie?y, the motion of the bar 49 is ?rst substantially
horizontal towards the observer during which phase a
blank standing on edge is separated from a stack of
blanks behind it. After the ?rst substantially translatory
motion the bar 40 performs a rotary motion above the
pivots 42 whereby the blank is turned substantially 90
grasps the cylindrical extensions 79. By an exchange of
a short link by a longer link the spacing of the jaws 76
and 77 may be reduced to handle a box of small size,
whereas replacement of the link ‘80 by a shorter link en
larges the space between the jaws '76 and 77 to accom
modate a larger box.
The mounting of the hydraulic cylinder within the box
frame 58 is a ?oating mounting insuring application of
degrees, or less, until it is horizontal. The second phase
equal force to both jaws 76 and 77.
of the motion of the bar 40 is followed by a third phase 10
A ?oating mounting, however, does not automatically
during which the blank is moved in a substantially verti
insure simultaneous application of force in both direc
cal direction, parallel to itself, whereafter the bar 4t)
tions, in that force may be applied sooner to one jaw
stops and the feeding mechanism releases the blank. The
than to the other. This would also subject a plunger
bar then moves through a return cycle, ?rst upward and
in the die to one-sided blow. To prevent this from hap
away from the blank, then on an are into the position 15 pening centering means are provided which, in the illus
in which it is shown in FIG. 1 and then away from the
trated form, comprise a centering arm 82 pivotally mount
observer towards the stack of blanks in order to pick up
ed to the box frame at 83. Connecting rods 84- and 35
the next blank. The location of the magazine is best
extend from the centering arm 82 to the bottom ends of
seen in FIGS. 6 to 11. FIG. 5 shows the blank and bar
the front pins ‘66 as is particularly well visible in FIG. 4.
40 during the rotary phase of the motion, FIG. 10 shows 20 The linkage comprising the centering lever with its two
the position in which a blank is about to be removed
connecting rods insures an equal distance of travel of
from the magazine and FIG. 6 shows the position in which
both jaws 76 and 77 with respect to the central axis of
the blank is about to be released in a substantially hori
the frame and simultaneous application of force at both
zontal position.
With an understanding of the basic construction and 25 A hydraulic pump driven by a separate electric motor
operation of the drive mechanism it will now be easy to
of approximately two horsepower size is enclosed in a
follow the construction and the operation of the speci?c
pump housing 86 shown in FIG. 3 and hydraulic lines
mechanisms for handling the blank, applying adhesive
extend from the pump to a hydraulic control valve 87
thereto, folding it into box shape and subjecting the
shaped box to compression to set the adhesive sufficiently
to permit the box to be discharged.
The box forming mechanism comprises a forming die
combined with a solenoid actuator from which a cable
88 extends to a control switch 89 (FIG. 12). The con
trol switch includes a movable arm on which a roller 90
is mounted resting on the periphery of a control cam 91
including means for expanding and contracting it for the
on the crank shaft 23.
purpose of ?rst admitting a formed box into the throat
The compression unit and its controls form the sub
of the die and then subjecting it to compressive force.
35 ject matter of a separate copending application, serial
The die mechanism is best explained by ?rst turning
No. 797,806, ?led March 6, 1959, now Patent No.
to FIG. 3 showing the mechanism in a state of partial
2,997,929. For the description of the present invention
assembly installed in the machine, and to FIG. 4 showing
it is sut?cient to state that the control cam 91 operates
the compression mechanism standing up on end so that
the control switch 89 in such a way that the hydraulic
its construction and operation can be followed.
40 control valve 87 ?rst directs the application of high hy
Referring ?rst to FIG. 3, the compression unit com
draulic pressure through pressure line 74 to move the
prises a heavy box frame 58 having side members 59 with
jaws 76 and 77 together, whereafter the hydraulic control
?anges 60 resting on the front arms 53 of the castings 51
valve 87 directs the application of a lower hydraulic pres
and held in place by the knurled nuts 54-. The side
sure through pressure line 73 to move the jaws apart.
members 59 are connected by transverse top plates 61
The jaws 76 and 77 have tapped holes 92 into which
and bottom plates 62 welded thereto, the whole structure 45 mounting bolts 111 may be screwed (see FIG. 5) for
being su?iciently strong to withstand forces of the order
attaching pressure plates 11% matching the exact size of
of several tons. Two pivot pins 63 extend through the
the wall panels of the box to which pressure is to be
box frame in the back and pivotally support jaw arms 64
applied. The pressure plates are preferably slightly
and 65, the other ends of which carry front pins 66
smaller than the wall panels of the box so that any excess
extending through apertures 67 in the transverse bottom
adhesive which is squeezed out of the gluing joint will
plate 62.
not be deposited on the plates and transferred to sub
A hydraulic cylinder 68 provided with an extension 69
sequent boxes.
is pivotally connected to the right jaw arm 65‘ by means
FIG. 3 also shows an empty magazine gate 93 attached
of the right front pin 66. A piston 70 is slidable in the
the magazine supporting plate 52. Box blank support
cylinder and its piston rod 721 extends through a stu?ing 55 ing bars 94 extend from the magazine gate to the rear.
box 72 to the outside. The piston rod is pivotally con
The bars support ?at box blanks standing on edge and
nected to the left jaw arm 64 by the left front pin 66.
the magazine gate 93 is so dimensioned that it retains
The piston subdivides the cylinder space into a ?rst
the frontmost blank by a slight marginal overlap su?i
chamber to which a ?exible pressure line 73 leads and
cient to hold the blanks in place, but permitting with
a second chamber to which a ?exible pressure line 74
extends. It is immediately apparent that excess pressure
in line 74 causes the piston to travel to the right as a
result of which the jaw arms 64 and 65 are drawn to
gether, Whereas excess pressure in the pressure line 73
causes the piston to travel to the left and the jaw arms
to move apart. A pair of stroke limiting screws 75 are
provided for limiting the opening movement.
A pair of jaws 76, 77 are mounted for parallel move
ment on rods 78 in the box frame. Only the rear rod is
drawal of blanks, one at a time, by the blank feeder
which includes suction cups 95. The suction cups are
mounted on a feeder frame 96 including lateral bars 97
attached to the feeder bar 40. The previously mentioned
?exible tubing 57 carries vacuum to the cups 95. The
magazine construction is disclosed in detail in the Patent
2,642,285 to Baker et al. of June 16, 1953.
FIG. 5 illustrates the plunger and die mechanism fully
assembled, in condition for operation.
A die frame 98 is mounted on the box frame 58 by
visible, the front rod being hidden under the transverse 70 four corner bolts 99, carrying knurled nuts 54. The die
plates. The jaws 76 and 77 have substantially cylindrical
frame is provided with curved front and rear die plates
extensions 79 secured thereto which are grasped by links
100 and 101, respectively, for folding the front panel
89. Each link has a closed end through which the center
and the back panel of the folding box, and side plates
pin 81 in each iaw arm extends and an open end which 75 102 and 103 for folding the end panels of the box blank
into box forming position. All four plates have down
wardly curved lips de?ning a substantially rectangular
die throat 104 above which an appropriately shaped plung
er 105 is mounted.
The plunger 195 is supported on the plunger drive bar
33 by a pneumatic mechanism later to be described. At
this point it is su?icient to state that vertical movement
of the bar 33 causes the plunger 1115 to move into and
out of the die throat in timed intervals.
The front and rear die plates 100 and 191 have slots 10
droplets are deposited within a marginal zone of the
?aps F.
The adhesive applicator forms the subject matter of a
separate copending application, Serial No. 797,792, ?led
March 6, 1959.
The die frame 98 further supports movable catches 125,
each catch comprising a base bracket 126 supporting a
latch 127 on a pivot 128, the latch being normally urged
towards the throat of the die by a spring 129. The catches
serve to hold a blank securely above the throat of the die
after the blank is deposited by the blank feeder so that the
blank does not change its position by reason of air drafts,
vibration, etc. during the approach of the plunger 105.
from being withdrawn upwardly when the plunger 1115
FIG. 5 shows the plunger 105 during its upstroke and
moves out of the die. The ?ngers 1% normally protrude
into the rectangular throat space, but may be pushed back 15 also shows the feeding mechanism moving a blank B
towards the die. 'In the position shown in FIG. 5 the
by a box blank entering the throat. The plunger is
gripper bar 40 of the feeder performs a rotary motion and
appropriately recessed at its front and rear surfaces as
moves on an arc to which the plane of the blank B is
shown at 107 to clear the stripper ?ngers in the event the
in them through which spring urged stripper ?ngers 1&5
protrude whose purpose it is to prevent a formed box
plunger moves into and out of the die without the blank
and to prevent the ?ngers from catching the plunger dur
ing its return stroke in normal operation.
The front and rear surfaces of the die carry opposed
box wall de?ectors 1118 which, in the illustrated form of
the machine, have the shape of a spring loaded ball.
substantially tangential.
FIG. 6 illustrates the end of the feed stroke during
which the feeder performs a translatory motion to deposit
the blank above the die throat. During tln's phase of the
feeding motion the four glue ?aps F of the blank ?rst
strike the four glue heads which act as prefolding elements
Corresponding vertical grooves 109 in the plunger body 25 and cause the ?aps to be folded into an angular position
with respect to the remainder of the blank B. At the end
provide clearance between the box wall de?ectors andthe
of the feed stroke the unfolded portion of the blank comes
plunger. The de?ectors bow in the front and rear walls
to rest on the horizontal portions of the die plate as seen,
of a completed box immediately after withdrawal of the
for extmple, at 100, ‘and the blank snaps underneath the
plunger so that the distance between the bowed-in por
tions of the front and rear walls becomes !less than the 30 four catches 125 which hold it securely in place during the
subsequent return motion of the feeder. .
corresponding dimension of the bottom panel of the next
‘box to be ‘formed.
As a result, the next box seats on
the top edge of the bowed-in wall portions of the last
In the prefolded position, the ?aps F assume substan
tially the same angle as the front plates 11.3 of the glue
heads and either rest against the glue heads or are spaced
formed box and causes the last formed box to be ejected
from the die.
35 therefrom by ‘a very narrow gap of the order of a milli
FIG. 21 illustrates the bowing in of the box, the action
of the stripper ?ngers 106- and also shows details of the
construction of the die.
Glue heads 112 are mounted at the four corners of the
die. Each head is mounted at an angle with respect to the
surface of the die frame 98 and includes a front plate 113
having a plurality of discharge apertures 114 arranged in a
pattern. Each discharge aperture 114
adapted to dis
charge a certain volume of iadhmive which is supplied to
the hollow interior of the glue head by an adhesive supply
duct 115. A reservoir 116 contains liquid adhesive which
is withdrawn from the reservoir through a duct 117 lead
ing to a glue feeding device, preferably in the form of a
positive displacement pump which then pumps adhesive
under pressure through the adhesive supply ducts to the
several glue heads.
The discharge apertures of the glue heads ‘are normally
open to permit periodic discharge of adhesive in response
meter or less. This ‘can simply be accomplished by setting
the glue heads at 'a slant slightly different from the slant
of the ?aps F.
The blank B is now released by an ‘appropriate vent
valve in the vacuum line 57 leading to the suction cups 95.
The valve, which will be referred to later in connection
with FIGS. 17 to 21, admits atmospheric air into the line
57 near the vacuum cups as a result of which the cups 95
release the blank. The blank feeder then begins its return
stroke and moves out of the way of the plunger 105’ which
descends to strike the bottom panel of the box blank as
shown in FIG. 7.
During the time the blank B is at rest the glue pump
makes a feed stroke to discharge a measured quantity of
adhesive through the four glue heads 112. Asa result a
pattern of predetermined outline of adhesive is deposited
to periodic actuation of the pump, but means are provided
on each of the flaps F. Details of the mechanism for
actuating the glue pump will later be described in connec
tion with FIGS. 17 to 21.
for closing some or all of the apertures by moveable pins
mounted interiorly of the heads. The glue head nearest
the observer in FIG. 21 is provided with a clear plastic
cover 118 showing three spring urged blocks 119, 120 and
121 inside the head, each block having a plurality of pins
122 at its front. A shaft 123 carrying a knurled knob 124
As the plunger enters the ‘die the front and back panels
whose edges were caught under the catches 125 are with
drawn therefrom and are folded upwardly as shown in
FIG. 8. The glue ?aps F remain at an angle with respect
to the front and back panels of the box and ‘are being
folded about the plunger brie?y prior to the folding of
at its upper end and a cam or eccentric (not visible) at
its lower end serves to adjust the three blocks in such a
manner that the pins of one, two or three blocks are with
of the glue ?aps F.
drawn from their respective discharge apertures whereby
the size of the glue pattern may be varied. In one extreme
the outer side walls of the box into upright position on top
FIG. 9 shows the plunger 105 in a position in which the
folding of the box blank B is nearly complete and the box
has entered the throat of the die except for its top portion
which is still visible above the front plate 100 and the side
position the blocks with their respective pins close all the
plate 102.
discharge apertures, so that clogging of the apertures by
FIG. 10 shows the plunger at the bottom of its stroke
drying adhesive is prevented.
and the plunger drive bar 33 at its lowest position. At
Application of adhesive to the ?aps F takes place shortly 70 this instant the compression unit is actuated by applying
high pressure through the line 74 to contract the die. The
after the ?aps F are folded into upwardly slanted position
by the feeder ‘and before the plunger 105 engages the
blank. Each discharge aperture of the applicators dis
charges a droplet of adhesive. These droplets are applied
in a pattern which is preferably of such outline that no
pressure which is applied is of the order of 2000 pounds
per square inch applying a force of the order of ?ve to
six tons at the jaws 76 and 77. The jaws press against
the side walls of the box with their pressure plates 1111
(see FIG. 3 showing the jaws and FIG. 5 showing the
pressure plate). The applied pressure causes the adhesive
to be distributed over the ?aps F as a very thin ?lm which
begins to set immediately due to the fact that the amount
of solvent to be absorbed by the board per unit of area
is very small. Under these conditions the adhesive be
comes highly tacky immediately and produces a secure
bond, although the application of pressure is quite short,
of the order of a fraction of a second.
The travel of the jaws is short and is maintained as
small as possible by an appropriate setting of the stroke
limiting screws 7 5 shown in FIG. 3.
The stroke ‘centering device, more particularly the
centering lever 82 and the connecting rods 84 and 85
(FIG. 4) insure simultaneous application of the force by
both jaws 76 and 77 of the compression unit, so that the
plunger is not subjected to a lateral blow by one jaw
striking before the other.
Although an application of compressive force during
a period of the order of one-?fth of a second is satisfac
tory, it is preferred to maintain the force as long as is con
sistent with the rate of operation of the machine.
As previously mentioned, the plunger drive bar 33
moves up and down continuously and never comes to rest
priate ?ttings. Intermediate its ends the housing is divid
ed by an internal cross wall not shown in the drawings.
The internal wall has two apertures through which the
upper portion of the housing may communicate with the
lower portion. ‘One of these apertures is. variable in size
by a needle valve N, the other is controlled by a check
valve C. The needle valve permits restricted passage of
air through the valve assembly in the direction of the axis
of the valve housing. The check valve permits relatively
free ?ow of air in one direction, but seals its passage when
the air flows in the opposite direction.
As a result of the inverted mounting of valve assembly
15% with respect to the assembly 149, atmospheric air
enters freely into the lower chamber of the cylinder 134
when its piston moves upwardly, whereas downward mo
tion of the same piston meets with resistance because air
being forced out of the lower chamber causes the check
valve C to close and can escape only through the restricted
needle valve N. Thus downward motion of the piston
20 within the right cylinder 134 is restrained whereas up
ward motion is unrestrained.
The reverse applies with respect to the piston within
the left cylinder 133. Upward piston motion, causing air
to enter its lower chamber, is restrained because air can
except at the return points at the ends of the up and down 25 only enter through its needle valve N while its check
stroke, respectively. It is not practicable to arrest the
valve C is closed. Downward motion, however, causing
plunger drive bar during the period of application of com
air to escape from the lower chamber, is unrestrained be
pressiv'e force due to the mass of the mechanism which
cause the air escapes freely through the check valve C.
would have to be stopped and then accelerated from rest.
An adustment of the needle valve N permits any de
It is thus readily seen that it is not practicable to mount 30 sired degree of restraint to be imposed on the upward
the plunger directly on the drive bar 33 which continues
motion and the downward motion of the pistons with
to move while the plunger must remain at rest during the
respect to the cylinders and thus upon the plunger 135
compression cycle. Also, it is necessary to accelerate the
with respect to its drive bar 33. The restraint is of an
plunger gradually from a position of rest without a result
elastic nature due to the compressibility and the expan
ing pounding in the drive mechanism by reason of the in 35 sibility of air.
ertia of the masses involved.
In order to prevent the pistons from bottoming in the
A pneumatic mechanism is provided which suspends
respective cylinders 133 and 134 ‘a pair of ‘butters 151 are
the plunger from the drive bar. This mechanism forms
mounted on the top plate 140 on which stops 152 on
the subject matter of a separate copending application,
piston plate 139 may seat.
Serial No. 797,676, ?led March 6, 1959, now Patent No.
It was previously mentioned that the downward motion
of the plunger 195 is ‘arrested in the position in which
The plunger drive bar 33 (FIGS. 10 and 11) carries
compressive force is exerted on the folding box.
two brackets 130‘ and 1311 on which a common base plate
In order to prevent sudden stops of the plunger from
132 is mounted. The base plate 132 carries two vertical
producing a corresponding impact on the drive a hydraulic
cylinders 133 and 134, each containing a piston 135 and 45 snubber mechanism is provided comprising a snubber
136 whose piston rods 137 and 13% extend through the
cylinder 153 mounted on the framework 11 on the
top of the cylinders and are connected by a piston plate
machine and a striker pad 154; on the piston plate 139'.
When the striker pad 154 seats on the rod 155 of the
The top ends of the cylinders 133 and 134 are held in
snubber piston 158 enclosed in the snubber cylinder 153
place by a top plate 141} which is rigidly connected to the
(see also FIG. 23), liquid 159 is displaced past the piston
base plate 132 by four spacer rods 14-1. The front rods
through a narrow passage let} which is restricted increas
are visible in FIG. 11 while a rearward rdd is also seen
ingly the farther the piston moves. A reservoir 156 is in
in PEG. 10. Two slide bearing sleeves 142 and 143 are
communication with the snubber cylinder 153 through a
also held between the base plate 132 and the top plate 141?.
hydraulic line 157. A spring 161 returns the piston 158
Plunger rods 144 and 145 extend slidably through the
to a normal rest position. The variable ?ow resistance
sleeves M2 and 143 and carry a plunger plate 146 at
in the liquid passage causes the end of the snubber 155
their lower ends. The plunger 105 is secured to the plung
to oifer increasing resistance to the downward motion of
er plate 146 by a bolt 147.
the piston plate 13%, and arrests plunger 195 gently.
The pistons 135 and 136 divide the cylinders into upper
It is now readily seen that once the plunger 105 has
chambers and lower chambers, the upper chambers being 60 reached its lowest position in the throat or" the ‘folding die,
in communication with the atmospheric air through air
and is temporarily clamped by reason of the action of the
?lters 14-8 which keep out dust. The lower chambers are
compression unit, the plunger drive bar 33 may start its
in communication with the atmosphere through similar
upward motion without delay. During the upward motion
?lters 14%. Valve assemblies 149 and 150 are interposed
between the lower chambers and the atmosphere, the as
sembly 159 being mounted upside down with respect to
the valve assembly 14$. Comparing FIG. 10 with FIG.
of the bar 33 the cylinders 133 and 13-”;- move into an up
65 ward direction with respect to their pistons which are at
rest by reason of being attached to the plunger. During
this motion air is compressed in the lower chamber of
11 it will be noted that the valve assemblies 149 and 151)
the cylinder 134, and escapes only slowly because of the
were rotated 90 degrees in FIG. 11 with respect to the
position in which they are shown in FIG. 10. This was 70 restriction of air flow by the needle valve N of the assem
merely done to show the inverted mounting in both ?g
bly 150. This compressed air represents a resilient driving
ures which would not he noticeable if the assemblies had
not been rotated for the purpose of illustration.
vforce which drives the plunger 1&5 upwardly as soon as
Each valve assembly comprises basically a housing
tapped at both ends for threaded connection with appro
the compressive ‘force by the compression unit is released.
This action is gentle and continues until the pistons are
75 raised so far that the stops 152 seat on the buffers 151,
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