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Патент USA US2509875

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May 30, 1950
o. E. LARSSON
2,509,870
CARTON STAPLING MACHINE
Filed July 22, 1949
14
I NVENTOR.
a?’ 513% ZM/M/n;
ATTOR N E Y
Patented May 30, 1950
2,509,870
UNITED STATES PATENT OFFICE
2,509,870
CARTON STAPLING MACHINE
Olof Einar Larsson, Orebro, Sweden
Application July 22, 1949, Serial No. 106,175
In Sweden August 16, 1948
2 Claims.
1
This invention relates to carton stapling ma
chines of the type comprising a frame, a stitch
ing apparatus mounted thereon, and adjustable
beams supporting two feed shafts having pulleys
for conveyor belts for feeding carton blanks
through the stitching apparatus.
(G1. 1—-11)
2
cal faces for guiding the edges of the carton
blank.
The shaft l4 of the stitching apparatus 22 is
driven intermittently by a drive pulley I5 suit
ably connected with a source of power, not shown.
The drive pulley rotates at a constant speed and
drives continuously the feed shafts | and 2 by
The object of the invention is to provide a ma
chine of the type indicated in which the opera
means of a belt or chain transmission 30 and a
tion of the stitching apparatus is started and
speed changing gear diagrammatically indicated
stopped by the movement of the carton blanks 10 at 26. Every time a series of staples is to be
and in which the positions of the ?rst and the
driven into the carton the drive pulley is engaged
last staple in a series of staples and the spaces
with the shaft I4 by means of an electrically actu
between consecutive staples can be conveniently
ated iron core 2|, the electric arrangement and
adjusted.
operation thereof being as follows.
I attain this object and other objects by mecha
Between the belts 8 there is provided a switch
nism illustrated in the annexed drawing, in
| 6, Fig. 3, connected to a source of electric cur
which—
rent 3|. When this switch is struck by the front
Fig. 1 shows an elevation of a carton stapling
or leading edge 9a of a carton blank 9 fed in the
machine viewed in the direction of movement of
direction of the arrow 32, it is closed and will be
the carton blanks; Fig. 2 is a section taken along 20 kept closed for as long as the carton blank is
the line 2-2, Fig. 1; Fig. 3 is a circuit diagram of
sliding over it. After a short moment, the front
an electric initiating device; Fig. 4 illustrates a
edge of the carton blank strikes a resilient bucket
frictional clutch for the stitching apparatus; Fig.
wheel I‘! which momentarily closes a switch I8
5 shows diagrammatically displaceable contact
members for the initiating device; and Fig. 6 is an
end elevation of a carton blank in folded position,
ready to receive staples.
Referring to the drawing, the stitching appara
tus 22 is arranged at the central portion of the
machine supported by a frame or support 28, the
power input shaft M of the stitching apparatus
extending laterally of the machine. The stitch
ing apparatus is shown diagrammatically only
and may be of any suitable construction. In par
allel relation to shaft l4, two feed shafts | and 2
are provided which are supported by beams 4 dis
by means of a vane wheel I9 mounted on the
same shaft as the bucket Wheel. Thereby an elec
tric circuit is closed, through the members 3|,
33, I6, 34, I8, 35, solenoid 20, and conductor 35.
As a result, the solenoid 20 attracts the iron core
2| which, in the manner described hereinbelow,
engages the drive pulley l5 with the shaft i4 so
as to start the stitching apparatus. In the mean
while, the switch IB has been opened by means
of a spring 23 and is ready to be closed again
when the next carton blank arrives. However,
the solenoid 20 is still traversed by the current,
in spite of the interruption at l8, because of the
fact that the iron core 2|, when it starts the
stitching apparatus, simultaneously closes a
shafts l and 2 have mounted thereon pulleys 5
switch 24. The current then flows through the
splined on the shafts so as to be displaceable
thereon together with the beams but not rota 40 members 3|, 33, Hi, 34, 24, 31, 20, 36. As a result,
the stitching apparatus will be operated until the
table relative to the shafts. Feed or conveyor
carton blank has passed the switch I6. At this
belts 8 mounted on the pulleys 5 support the car
moment, a spring 25 opens the circuit at I6, and
ton blank 9 which is kept in engagement with the
the solenoid is deenergized. A spring 28 then
conveyor belts 8 by means of pressure rollers I!)
back the iron core which disengages the
which are slightly conical having their smaller 45 pushes
stitching apparatus from the drive pulley I5.
end faces directed toward the blank portions to
On the shaft I4 of the stitching apparatus there
be united by the staple seam. The rollers l0 are
is loosely mounted a disc 38, Fig. 4. A helical
mounted on pins I I supported by beams 3. In the
spring 39 is provided in an annular space 40 be
beams 3 there are also mounted vertical pins for
50 tween the outer circumference of the disc 38 .and
bevel gears l2 cooperating with bevel gears l3
an inner cylindrical face 45 of the drive pulley
slidably mounted on the shafts | and 2 but not
I5. One end 4| of the spring is secured to the
rotatable relative to the shafts. On the vertical
shaft I4 and the other end 42 is secured to the
pins or shafts for the bevel gears l2 there are
disc 38. The disc has a radially extending shoul
mounted pulleys Ii for guide belts 1 having verti 65 der 43 which in the position illustrated is engaged
placeably carried by stationary bars 29.
The
2,509,870
3
by the upper end of a rod lid connected with the
iron core 2 l .
With the parts in the position shown in Figs. 3
and 4, the shaft M of the stitching apparatus is
disengaged from the drive pulley l5. When the
solenoid it attracts the iron core, the rod lili- is
moved downward out of engagement with the
shoulder
of the disc 38 and the disc is released
to the action of the spring 39. The spring 39,
which inrthe position shown in Fig. 4 is in a com
pressed state, will then expand radially and en
gage the inner face ‘it of the drive pulley. The
frictional contact of the spring 39 with the ro
tating drive pulley l5 causes the rotation of the
spring and the shaft Hi in the direction of the
arrow (iii. When the rod is again moved upward
into the position illustrated, it will arrest the ro
tation of the disc 38, the spring 39 will compress
and relieve its frictional contact with the driving
pulley i5, and the connection between the drive
pulley and the shaft M will be interrupted.
By means of the speed changing gear 26, the
ratio between the speeds of the feed shafts i, 2
and the shaft M can be varied. If the carton
blank is fed at a low speed, the stitching appa~
ratus has time to apply a great number of staples
while the carton blank passes the same, and vice
versa.
The place where the staples are driven into
4
shaft, a ?rst switch located in the carton path
in advance of the working position of the stitch
ing apparatus, as viewed in the direction of move
ment of the carton, said switch being constructed
and arranged to be closed by contact with the
leading edge of a carton and to be kept closed
ior as long as the carton is sliding thereon and
to be opened when the trailing edge of the carton
comes out of contact therewith, a second switch
located in the carton path behind the working
position of the stitching apparatus, said second
switch being constructed and arranged to be
closed momentarily by contact with the leading
edge of said carton, a source of electric curre t
connected to said switches, a solenoid connecte ’
to said circuit-breakers to be energized upon clos
ing of the switches and to be deenergized upo
opening of said ?rst switch, an iron core adapted
to be attracted by said solenoid, a third switch
operatively connected to said iron core to be closed
upon attraction thereof whereby to maintain said
solenoid in an energized state irrespective of the
opening of said second switch, and means con
nected with said iron core
engaging said
clutch when the solenoid is energized and reieas~
ing said clutch when the solenoid is deenergized.
2. In a carton stapling machine, a stitching
apparatus having a power input shaft, carton
feeding means including feed shafts, driving
the work is indicated at 27. The distances from 30 means for rotating said feed shafts, a clutch for
the switches i5 and lg to the position 2? are ad
connecting the driving means with said input
justable. To this end, the switches are mounted
shaft, a ?rst switch located in the carton path in
in suitable boxes or carriers iii and iii, respec
advance of the working position of the stitching
tively, which are slidably arranged on the frame
apparatus, as viewed in the direction of move
23. The distance between the points 2'? and i8
ment of the'carton, said switch being displace
de?nes the distance between the front edge of the
able in said direction and constructed and ar
carton blank and the ?rst staple applied, whereas
ranged to be closed by contact with the. leading
the distance between the points 2? and it de?nes
edge of a carton and to be
closed for as long
the distance between the last staple applied and
as the carton is sliding thereon and to be opened
the rear edge of the carton blank. It is thus 40 when the trailing edge of the carton comes out of
possible, by changing the positions of the switches
contact therewith, a second switch located in the
it and E8, to predetermine the distances of the
carton path behind the working position of the
staples applied from the front or leading edge
stitching apparatus, said second switch being
and the rear or trailing edge of the carton blank.
displaceable in said direction and constructed
Due to the fact that the switch it is closed mo
and arranged to be closed momentarily by con
mentarily only, carton blanks can be fed through
tact with the leading edge of said carton, a source
the machine with very small distances between
of electric current connected to said switches,
the rear or trailing edge of a blank and the front
a solenoid connected to said circuit-breakers to
or leading edge of the next blank. This would
be energized upon closing of the switches: and to
not be possible if the switch is were kept closed
be deenergized upon opening or‘ said ?rst switch,
until the blank has passed it. In that case, a
an iron core adapted to be attracted by said sole
new blank could be fed only after the preceding
noid, a third switch cperatively connected to said
blank has left the switch it, since otherwise the
iron core to be closed upon attraction thereof
stitching apparatus would be disengaged only
whereby to maintain said solenoid in an energized
during the period between the disengagement of
state irrespective of the opening of said second
the switch it‘ from a blank to the engagement
switch, and means connected with said iron core
thereof with the next blank.
and engaging said clutch when the solenoid is
What I claim is:
energized and releasing said clutch when the
1. In a carton stapling machine, a stitching
solenoid is deenergized.
apparatus having a power input shaft, carton
l OLOF EINAR LARSSON.
,5 means including feed shafts, driving
No references cited.
means for rotating said iced shafts, a clutch for
connecting the driving means with said input
Certi?cate of Correction
Patent No. 2,509,870
May 30, 1950
OLOF EINAR LARSSON
It is hereby certi?ed that errors appear in the printed speci?cation of the above
numbered patent requiring correction as follows:
Column 4, lines 16 and 48, for “circuit-breakers” read switches;
and that the said Letters Patent should be read With these corrections therein that
the same may conform to the record of the case in the Patent Office.
Signed and sealed this 5th day of September, A. D. 1950.
[SEAL]
THOMAS F. MURPHY,
- Assistant Oommz'ssz'oner of Patents.
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