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Патент USA US3018987

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Jan. 30, 1962
K. s. A. SKALLQUIST
3,013,977
DRIVING MANDREL FOR ROLLS OF PAPER IN PRINTING
AND SIMILAR MACHINES '
2 Sheets-Sheet 1
Filed Aug. 24, 1959
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Jan. 30, 1962
K. s. A. SKAL
DRIVING MAND
Filed Aug. 24, 1959
UIST
3,018,977
FOR ROLLS
P P R IN PRINTING
SIMILAR MACHI
2 Sheets-Sheet 2
"
ite States
atent
Nice
3,618,971
Patented Jan. 30, 1962
2
1
spindle which is connected to a shart 40 which is mounted
for rotation in a frame ‘41 by means of a ball bearing 42.
Mounted on the spindle A is a roll of paper B which
is wound up on a bobbin 30 which may consist of tightly
wound paper. The bobbin 30 has a certain inherent ra
dial resiliency, as is well known in the art. The shaft 40
is suitably driven by a motor, not shown, and may be
3,018,977
DRIVING MANDREL FOR ROLLS OF PAPER IN
PRINTING AND SIMILAR MACHINES
Karl Sture Alvar Skallquist, Alvsjo, Sweden, assignor to
Dagens Nyheters Aktiebolag, Stockholm, Sweden, a
corporation of Sweden
Filed Aug. 24, 1959, Ser. No. 835,729
Claims priority, application Sweden Aug. 27, 1958
3 Claims. (Cl. 242-72)
combined with a braking mechanism, not shown, such
as a friction brake of conventional type.
10
This invention relates to printing machines, and
As will be seen from FIG. 4 which shows a longitudinal
section of the spindle A from the axis of rotation to the
periphery, the spindle comprises a core 1 which has a
conical portion 1a to be connected to the shaft 40 which
may be driven by an electric motor, not shown. The
especially to mandrels for use in such machines.
In modern printing machines, rolls of paper or the
like are mounted on the mandrels, and the mandrels are
rotated to speed up the rolls to give the paper or the 15 core has a central bore 2 for a locking screw which can
be screwed into the driving shaft 40. The core further has
like the velocity required in the printing machine.
a plurality of substantially axial grooves 3. Each groove
In order to avoid waste of time the connection of
has a rounded bottom 4 (FIG. 3) and side walls 5 and 6
the roll to the mandrel is preferably eifected auto
matically.
which make an angle with each other as viewed in cross
should be such that it can prevent relative rotation in
either sense between the roll and the mandrel.
of the bottom 4 of the groove 3.
However, the mandrel is often used to brake the roll 20 section. The grooves receive pivotally mounted gripping
members 7 for the roll of paper. Each gripping member
after it has been speeded up to the desired velocity. There
is rounded at its inner end in accordance with the shape
,fore the automatic connection of the mandrel to the roll
At its radially inner
end, each gripping member, as shown in FIG. 4, has
A paper printing machine according to this invention 25 journals 8 one of which enters‘ a bore 9‘ in the core 1,
whereas the other one enters a bore 10 in a front ring
comprises a spindle adapted to receive a roll of material
11 which is bolted to the core by means of screws 12,
and to be driven by a power source; gripping members
FIG. 2, and also serves, to limit axial movement of the
movably mounted on the spindle and adapted to be
gripping members along the grooves 3.
moved into ?rm engagement with the roll to connect
The grooved portion 111 of the core 1 is surrounded by
the roll to the spindle upon movement of the spindle 30
a sleeve 15 which is slightly conically tapering outwardly
relatively to the roll caused by inertia of the roll upon
and formed with axial apertures or slots 16 through which
starting to rotate; a locking device movable in relation
the tongue-like clamping portions of the gripping mem
to the spindle and adapted to retain- the gripping mem
bers 7 extend outwardly. The sleeve 15 is mounted for
bers in a certain position relative to the spindle; and a
ratchet means by which said locking device is connected 35 turning movement as well as axial displacement relatively
to the portion 1b of the core 1. Longitudinally, the
to said spindle and which is such as to permit relative
gripping members snugly ?t the slots 16 so that they will
movement between the locking device and spindle in a
be axially displaced together with the drum.
direction to permit the gripping members to move into
The sleeve 15 is connectible to the core by a ratchet
?rm engagement with the roll but which prevents such
40 comprising locking teeth 17 which are arranged in a closed
relative movement in the opposite direction.
circle and extend axially on a ?ange 18. The locking
Thus mere mounting of the roll upon the spindle
teeth 17 are engaged by locking members or dogs 20
will, when the spindle starts to rotate, result in connec
provided in the core 1 or, as illustrated, in a separate
tion of the roll to the spindle. In addition the grip
ring 21 ‘which by means of screws 22 is secured to the
ping members are held by the locking device in contact
45 core. The locking dogs are axially displaceably mounted
with the roll when the spindle is braked.
in bores 23 and biased by compression springs 24. Each
It is also desirable to be able'to remove rapidly the
locking dog has a ?ange 25 adapted to abut against a
bobbin of an empty roll. This involves disengagement
shoulder in the ring '21 for limitation of the outward
of the gripping members from the roll.
movement of the dogs. The ?ange 25 is guided in the
According to a further feature of this invention, the
ratchet parts are separated, by axial movement of the bob 50 ring '21 such as to prevent the dog from turning in its
bore. A suitable number of locking dogs 29 are cir
' bin of the empty roll, and this permits the locking device
cumferentially spaced apart.
'
to move relatively to the spindle to permit the automatic
disengagement of the gripping members by radial resili~
In the position illustrated, the ratchet means 17, 20
‘
is engaged. At the start when a new roll of paper is to
spindle in the direction of the arrow A in FIGURE 1,
dogs 20 are not in engagement with teeth 17. In this
a view of ‘the ‘mandrel on which a roll of paper is
face of the sleeve 15, but nevertheles areable to engage
the wallof the central bore of the bobbin of a- roll of
» paper whichiis slid onto, the spindle. As the roll of paper
ency of the bobbin of the empty roll.
FIG. 1 is a partially sectional side view of a spindle 55 be mounted on .the spindle, the sleeve 15 and the gripping
members 7 are in their left hand end positions and the
along the line vI~-I in FIG. 3, FIG. 2 an end view of the
position, the gripping members 7 assume the extreme
.FIG. 3 a cross-sectional view along the line III-4H in
slanting positions with respect to the radial position, as
FIG. 1, and FIG. 4 a longitudinal sectional view along
the line IV——IV in FIG. 27. FIGS. 5 and 6 are illustra 60 shown in FIGS. 3 and 5, where the outer ends of the
‘gripping members but slightly project from the outer sur
tive of the mode of operation of a detail, and FIG. 7 is
mounted.
.
.
-
' ' Referring ?rst to FIG. 7, referenceletter A'denotes a
8,018,977
3
4
is slid onto the sleeve 15, the sleeve will be moved to the
be active upon turning of the toothed member through a
distance equal to half the circular pitch of the teeth.
What I claim is:
1. In a printing machine, a drive mandrel comprising
a spindle, said spindle comprising a core adapted to be
right as viewed in FIG. 4 and the teeth 20 engage the
ring 17. When at the same time or thereafter the core 1
is rotated by the shaft ‘40 in the direction of the arrow
p, FIG. 5, the gripping members 7, due to the relative
movement between the core and the roll which lags
because of its inertia, is pivoted in the core towards its
dead center position and gradually increase the hold of
the bobbin 3i} of the roll until the core 1 and the roll 13
are ?rmly connected with each other; this movement is 10
permitted by the ratchet, the dogs sliding over the oblique
faces of the teeth ‘17. Finally, the roll is locked to the
spindle A in one direction by the gripping members 7
and in the other direction by the sleeve 15 which is pre
vented from turning on the core by the ratchet 17, 20, the
sleeve thus constituting a locking device for the gripping
members.
After the roll of paper has been speeded up to the
required velocity and the paper sheet has assumed its
operative position in the printing machine, a braking
action may be applied through the driving shaft 40‘ to
driven by a power source and a sleeve axially slidable
and turnably mounted on said core and having a number
of apertures, said sleeve being such that it is adapted to
enter the bore of a roll of material; gripping members
pivotally mounted in grooves in said core to project
through said apertures in said sleeve and adapted to be
pivoted towards their dead center position into ?rm en
gagement with said roll to connect said roll (to said core
by relative movement of said spindle relatively to said
roll caused by'inertia' of said roll upon starting to rotate;
and a ratchet which comprisesa ring of teeth on said
sleeve and at least one dog on said core arranged to per
mit said sleeve‘to turn relatively to said core in one direc
tion to enable'said gripping members to engage said roll
and to prevent vsaid sleeve fromiturning relatively to said
core in the opposite direction whereby the edges of said
apertures in said sleeve engage said members to prevent
them moving out of ?rm engagement with said roll, and
mounting ofrsaid rollion saidsleeve slides said sleeve on
25 said core in one‘axial direction/to move said ring into
the spindle A. The braking force is transmitted to the
roll by the gripping members 7, which are prevented
from pivoting from the position of FIGURE 6 to the
position of FIGURE 5 by the ‘sleeve; the sleeve is now
prevented from turning on the core by the ratchet 17, 20.
engagement with said dog and’removal of said roll slides
The mode of operation of the gripping elements 7 is
said sleeve in‘ the opposite axial direction vto'move said
diagrammatically illustrated in FIGS. 5 and 6. FIG. 5
ring out of engagement with said dog, so that said roll,
shows a gripping member in the position which it assumes
by virtue of its radial resilience, is thereupon able to move
when a roll of paper B is slid onto the spindle. When the 30 said gripping members out of ?rm engagement with its
spindle 1 rotates in the direction of the arrow p, the
bore.
gripping members gradually increase their hold of the
2. In a printing'machine, a drive mandrel comprising
bobbin until the position shown in FIG. 6 is obtained in
a spindle, said spindle comprising a core adapted to be
which the pants are firmly connected to each other. This
driven by a power source and a sleeve axially and turn
clamping position is usually obtained very quickly, say 35 ably slidably mounted ‘on said core and having a number
after a turning movement of a few degrees. The central
of apertures, said sleeve being'adapted to enter the bore
longitudinal plane 31, FIG. 6, of the gripping members
of a roll of material; gripping members vin the form of
is always located lateral of and on the same side of the
longitudinally extending plates whose radial inner ends
axis 32 of the spindle so that, in operation, the gripping
are pivotally mounted and axially displaceable in axial
members do not reach the dead center position. In 40 grooves in said'core and which extend through axial
FIG. 2, the gripping members are shown in extreme
apertures in said sleeve, said members being closely sur
positions which never occur in practical operation.
rounded by the edges of said apertures and pivotable
After the paper has been wound oif, the bobbin 30 has
towards their dead centerposition into ?rm engagement
to be removed from the spindle to give way for a new
with the bore of said roll to connect said ‘roll to ‘said core
roll of paper. When the bobbin is drawn oif it imparts
a short axial movement to the gripping members and the
sleeve 15, resulting in that the locking teeth 17 are dis
by relative movement of said spindle relatively to said roll
caused by inertia of said roll upon starting to rotate;
and a. ratchet arranged to permit said sleeve to turn rela
tively to said core in one direction to enable said gripping
can turn freely relative to the core 1 of the spindle, and 50 members to engage said roll and which prevents said
also the gripping members are ‘free to pivot in their slots.
sleeve from turning relatively to said core in the opposite
Due to its inherent radial resiliency, the bobbin 30 exerts
direction whereby the edges of said apertures in said
a pressure on the gripping members 7 in the direction of
Sleeve engage said members to prevent them moving out
engaged from the dogs 20. Consequently, the sleeve 15
the arrow p2, FIG. 6. This pressure causes a relative
of ?rm engagement with said roll, said ratchet comprising
turning movement of the parts 1 and 15, 80 due to which 55 a toothed ring on said sleeve and a plurality of spring
the gripping members are moved back to the position
biased dogs on said core whereby mounting of said roll
on said sleeve slides said gripping members and said
shown in FIG. 5 and loosen their ?rm hold on the bobbin
sleeve in one axial direction on said core to move said
30 which then can be easily drawn o? the spindle.
ring into engagement with said dogs and removal of said
Due to the arrangement described, a roll of paper can
be automatically locked to a driving spindle in both direc 60 roll slides said gripping members in their grooves and
said sleeve in the opposite axial direction to move said
tions of rotation, and the locking engagement can be
ring out of engagement with said dogs so that said roll,
readily released by a simple axial movement of the roll
by virtue of its radial resilience, is thereupon able to pivot
to be exchanged. As a result, the necessary operations
said gripping members out of ?rm engagement with its
are considerably simpli?ed as compared with conventional
65 bore.
arrangements.
3. In a printing machine, a mandrel for a roll of mate
It should be possible to engage the members 17 and 20
rial comprising a rotatably mounted core tapering at its
in short circumferential steps so as to ensure ?ne adjust
free end and a sleeve turnably mounted on said core and
ment of the locking movement without any play. Never
having a number of apertures, said sleeve being such that
theless very strong locking teeth may be used if the cir 70 it is adapted to enter the bore of the roll; gripping mem
cumferential spacing of the locking dogs or of groups of
bers pivotally mounted in grooves in said core to project
locking dogs is other than the circular pitch of the locking
through said apertures in said sleeve and adapted to be
teeth. By way of example, sixty-three teeth 17 may be
pivoted towards their dead centre position into ?rm en
provided and six locking teeth may be equally circum
gagement with said roll to connect said roll to said core
ferentially spaced apart. In this case a group of dogs will 75 by turning movement of said sleeve relatively to said
3,018,977
5
6
core; said sleeve being slidable on said core in axial direc
axial direction to move said ring out of engagement with
tions thereof; and a ratchet which comprises a ring of
said dog.
teeth on said sleeve and at least one dog on said core
arranged to permit said sleeve to turn relatively to said
References Cited in the ?le of this patent
core in one direction to enable said gripping members to
UNITED STATES PATENTS
engage said roll and to prevent said sleeve from turning
1,188,369
relatively to said core in the opposite direction whereby
1,858,607
the edges of said apertures in said sleeve engage said
members to prevent them from moving out of ?rm en
gagement with said roll, and mouting of said roll on said 10'
sleeve slides said sleeve on said core in one axial direc
tion to move said ring into engagement with said dog,
and removal of said roll slides said sleeve in the opposite
Chernack ____________ _- June 20, 1916
Whalen ______________ __ May 17, 1932
FOREIGN PATENTS
530,480
Great Britain ________ __ Dec. 12, 1940 I
139,151
Sweden ______________ __ Feb. 17, 1953
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