Note: Descriptions are shown in the official language in which they were submitted.
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The present invention relates to a reel-up in a paper
machine for manufacturing a paper web, reeled onto
reeling drums to form paper reels, which reeling drums
have bearing housings at their ends, which reel-up
comprises
- two lower stand parts with rails, along which the
reeling drums, rotatably carried by their bearing
housings, are displaced,
- two upper stand parts with rails for carrying a stock
of empty reeling drums,
- a support means in the shape of a surface winding drum
and/or a belt, over which the paper web runs and which is
rotatably journalled in bearing housings arranged on the
lower stand parts,
- a primary system, including two primary arms with
gripping members for carrying and retaining a reeling
drum in its bearing housings, which primary arms are
pivotably journalled about an axis of pivot at the lower
stand parts and have actuators for moving the reeling
drum along the support means from an upper position to a
lower position adjacent to the rails for wrapping and
initial reeling of the paper web onto the reeling drum,
- a secondary system, including two secondary members
with gripping members for gripping a reeling drum at its
bearing housings, which secondary members are movably
journalled on the lower stand parts and have actuators
for moving the reeling drum along the rails.
For reeling paper reels it is common to use two systems
to maintain continuous production in the reel-up, namely
a primary system, having a pair of pivotable primary arms
with gripping devices to receive an empty reeling drum,
and a secondary system, which receives the reeling drum
from the primary system once an initial number of turns
of the paper web have been wound onto the reeling drum.
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The secondary system usually has either a pair of
secondary arms or a pair of secondary carriages, which,
as the diameter of the paper reel increases, are pivoted
or linearly displaced, depending on the case, along a
pair of mutually parallel stand members, on which a
driven surface winding drum is rotatably arranged, over
which the paper web runs, The primary arms place the
reeling drum to abut the surface winding drum to initiate
reeling of the web. Thereafter, the primary arms convey
the reeling drum along the surface winding drum down to
two rails, along which the reeling drum, rotatably
carried by its bearing housings, is displaced during the
continued reeling of the web. It is important that a
certain linear load is maintained against the surface
winding drum and that the paper reel, during its growing,
is evenly reeled without creases and folds arising in the
layers, especially the inner layers, which otherwise must
be discarded. The linear load varies throughout the
reeling-up operation in magnitude as well as direction
and depends mainly on the three variables applied load,
weight increase of the growing paper reel, and current
location of the paper reel along the envelope surface of
the surface winding drum. The location relative to the
surface winding drum causes the linear load to vary, as
the paper reel is pressed against the envelope surface
along a contact line, which is shifted downwards in an
arc-shaped movement along the envelope surface, whereby a
horizontal as well as a vertical force component arises,
the magnitudes of which vary mutually throughout the
entire movement. The linear load is affected negatively
also during the transfer of the reeling drum from the
primary system to the secondary system, as an exchange
must take place between the separate gripping members of
the two systems and, with central drive, between two
separate drive means as well, whereby a temporary
increase in pressure arises. To optimize the reeling-up
operation, the linear load must be kept within carefully
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determined maximum and minimum values throughout the
entire reeling-up process. To reduce the negative effects
of the described variations in the linear load between
the growing paper reel and the surface winding drum,
arrangements with cam steerings and/or power cylinders by
the primary arms to regulate the linear load in the nip
have been tested. Thus, US-3,614,011 describes a reel-up
with two primary arms, which each have a loading device
outside the reeling drum to regulate the applied load,
which loading device comprises a power cylinder and a
holding hook displaceable along the primary arm by means
of the power cylinder. Each loading device co-operates
with an unloading device, comprising a lower,
manoeuvrable cam track, arranged at each end of the
surface winding drum of the reel-up. The reeling drum is
supported on the cam tracks and conveyed along the curved
surfaces of the same down to a pair of rails, where two
secondary arms assume control of the paper reel. Each cam
track is pivotable about a shaft by means of a power
cylinder to be able to regulate the linear load to some
extent while the paper reel is growing against the
surface winding drum. The linear load in the nip is thus
regulated by the power cylinders of the loading devices,
through the displacement of the locking hooks, as well as
by the power cylinders of the unloading devices, through
the adjustment of the cam tracks. US-4,634,068 describes
a reel-up, in which it is sought to control the variation
of the linear load. Each primary arm comprises a loading
device with a power cylinder, which controls an upper
locking hook displaceable along the primary arm, and an
unloading device, arranged at the primary arm and having
a lower support with an unloading cylinder, arranged to
relieve the nip of the increasing weight of the paper
reel. In the known reel-ups described above, the control
of the linear load must be performed by two completely
separate, but yet necessarily mutually co-operating,
devices, of which the loading device alone regulates the
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applied load, while the unloading device regulates the
unloading of the weight of the reeling drum and the
increasing weight of the growing paper reel. This makes
it very difficult to control the linear load in an
optimal way. A further problem with both these known
reel-ups is that their primary arms have gripping devices
with fixed or substantially fixed lower holders for the
reeling drum. The diameter of the paper reel can thus
only be permitted to increase to a certain pre-determined
maximum limit before the paper reel lifts the reeling
drum from said lower holders. To be able to reel more
paper onto the reeling drum while it is still held by the
primary arms, the displaceable upper locking hook and the
fixed lower holder or cam track have, in some reel-ups,
been replaced by a gripping device with two pivotable
gripping parts, consisting of an upper locking hook and a
lower support arm, both being journalled to the primary
arm about separate pivoting shafts. As the diameter of
the paper reel increases, the locking hook and support
arm are pivoted out from the envelope surface of the
surface winding drum. The reeling drum is thereby
undesirably rotated within the gripping device, which
rotation is caused by the locking hook and support arm
being displaced in parallel relative to the surface
winding drum whilst simultaneously being pivoted about
their respective pivoting shafts, journalled a distance
from each other.
The object of the present invention is to provide an
improved reel-up, which reduces the problems discussed
above, at least to a considerable extent.
The reel-up, in accordance with the invention, is
characterized in that each gripping member of the primary
system comprises
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- an outer locking arm, pivotably journalled about a
journalling shaft on the upper mounting part of the
primary arm,
- an inner locking arm, pivotably journalled about the
5 same journalling shaft as the outer locking arm,
- a first actuator, carried by the gripping member and
arranged to open and close the gripping member by
pivoting the outer locking arm about the journalling
shaft in relation to the inner locking arm so as, in the
open position, to receive the reeling drum and, in the
closed position, retain the same at its bearing housing,
- a second actuator, pivotably mounted to and extending
between the inner locking arm and the upper mounting part
of the primary arm, in which configuration the outer
locking arm, the inner locking arm and the first actuator
constitute a pivotable unit arranged; when influenced by
the second actuator, to be pivoted about the journalling
shaft to regulate the linear load between the paper reel
growing on the reeling drum and the support means.
The reel-up, in accordance with the invention, has a
primary system, which provides considerably improved
control of the linear load between the surface winding
drum and the growing paper reel, which means that the
linear load can be regulated with greater precision than
previously possible. Through the invention, it is
possible to lock the actuator controlling the locking
arms, so that it locks or fixes the gripping device in a
locked position whilst maintaining the power applied for
locking. The function can be simply described as a
"frozen" condition. This means that a possible leakage in
the supply pipes to the actuator does not prejudice the
fixed, locked position of the locking arms retaining the
reeling drum. Improved safety is achieved in that there
is no risk of the reeling drum falling out of the
gripping device under the influence of its own weight in
the event of the above-mentioned fault arising.
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Additionally, a very safe transition can be achieved
between the primary system and the secondary system so
that the linear load can be maintained within the
prescribed range even during this transition.
The invention is further described with reference to the
accompanying drawings.
Figure 1 is a perspective view of the upstream part of a
reel-up with a primary system in accordance with the
invention.
Figure 2 is a side view of the reel-up in accordance with
Figure 1 and shows schematically one of the primary arms
of the primary system with a gripping member in
accordance with the invention in an open top position and
with a paper reel being reeled in a secondary carriage.
Figure 3 is an enlargement of the gripping member in
Figure 2.
Figure 4 shows the reel-up in accordance with Figure 2
with a new reeling drum being held by the closed gripping
member with the primary arm in its top position.
Figure 5 shows the reel-up in accordance with Figure 2
with a completed paper reel in the secondary carriage and
with a commenced paper reel in the primary arm in its
rail position.
Figure 6 shows the reel-up in accordance with Figure 2
with the closed gripping member in the rail position, a
reeling drum with a commenced paper reel being
transferred to a secondary carriage.
Figure 7 is an enlarged perspective view of one of the
primary arms in the reel-up in accordance with Figure 1.
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In Figure 1, the upstream part of a reel-up in a paper
machine, in which paper is manufactured in a continuous
web, is shown a perspective view. The web 1 is reeled in
the reel-up, as shown in Figure 2, on a rotatable reeling
drum 2 to form a paper reel. The reeling drum 2 has a
bearing housing 4 arranged axially inside a braking drum
18 at each end, which bearing housing 4 is provided with
a peripheral, surrounding groove 40, see Figure 7. The
braking drum 18 is usually provided with an axial
coupling device.
The reel-up comprises a machine-stand with two lower,
longitudinally extending stand parts 5 and two upper,
longitudinally extending stand parts 7. Rails 9, 10 are
horizontally, rigidly mounted to these stand parts to
support the reeling drums 2, which, carried in their
bearing housings 4, roll along the rails 9, 10, the
latter being received in the grooves 40 of the bearing
housings 4.
A support means in the shape of a surface winding drum 11
extends between the lower stand parts 5 and has shaft
pins 12 for rotatable journalling of the surface winding
drum 11 in bearing housings 13, mounted on the lower
stand parts 5. The paper web 1 runs about the envelope
surface of the surface winding drum 11, and a drive
device (not shown) is arranged to rotate the surface
winding drum 11 with a peripheral speed that corresponds
to the speed of the paper web 1. It will be understood
that the distance between the rails 9 of the lower stand
parts 5 is somewhat greater than the width of the web. As
is apparent from Figure 7, each bearing housing 13 has
inner and outer end walls 14, 15 and a tubular,
rotationally symmetrical casing 16, which is concentric
with the shaft pin 12 and pivotably journalled in the
bearing housing 13. Thus, the axis of pivot of the casing
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16 coincides with the axis of rotation of the surface
winding drum 11.
The rails 10 of the upper stand parts 7 are arranged to
support a stock of reeling drums 2.
The reel-up comprises two lowering arms 17, pivotably
journalled on the machine-stand to be pivoted, by means
of hydraulic cylinders 19, between an upper collecting
position, see Figure 2, and a lower delivering position,
see Figure 4.
The reel-up comprises a primary system and a secondary
system to provide continuous reeling of the paper web 1
on a reeling drum 2.
The secondary system has two secondary carriages 20, each
journalled to a respective lower stand part 5, to be
linearly moved along the stand parts 5. A hydraulic
cylinder (not shown) is attached to each secondary
carriage 20 and stand part 5 for reciprocating movement
of the secondary carriage 20 along the stand part 5 in a
controlled manner. The movements of the secondary
carriages 20 are synchronized with each other. Each
secondary carriage 20 has a gripping member, which
comprises a locking arm 21 and a press arm 22 and is
arranged to receive a reeling drum 2 with a commenced
paper reel 3 and to remove the same when the paper reel
is completed and, further to be closed around the bearing
housings of the same to guide the reeling drum 2 along
the rails 9 whilst maintaining the requisite linear load
between the growing paper reel 3 and the surface winding
drum 11. The locking and press arms 21, 22 are pivotably
journalled on the secondary carriages 20 and manipulated
by hydraulic cylinders (not shown), comprised in the
control system of the reel-up for control of the
reeling-up process. The free ends of the locking and
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press arms 21, 22 carry small, rotatably journalled
pulleys for co-operation with the bearing housings 4 of
the reeling drum so that these are free to roll along the
rails 9. The reference number 23 denotes a position
indicator of inductive type in the control system
provided on each press arm 22 to detect a stop position
for the respective secondary carriage 20, as the latter
must stop, during the returning movement, a certain
distance before the press arm 22 contacts the bearing
housing 4 of the reeling drum 2, see Figure 6.
The primary system comprises two primary arms 24,
pivotably journalled to pivot about the axis of rotation
of the surface winding drum 11 in that the primary arms
24 are rigidly mounted, by welding, for instance, to the
tubular, pivotably journalled casings 16 of the bearing
housings 13 of the surface winding drum 11. Each primary
arm 24 has a waist part 25, by means of which the primary
arm 24 is rigidly connected to the respective bearing
housing 13 of the surface winding drum 11, a lower
mounting part 26 and an upper mounting part 27, which two
mounting parts 26, 27 are located on either side of the
axis of rotation of the surface winding drum 11. A
hydraulic cylinder 28 is, via its piston-rod 29,
pivotably mounted to the lower mounting part 26 of the
primary arm 24 and, via the end of its cylinder 30,
pivotably mounted to the respective lower stand part 5. A
horizontal synchronization shaft 31 extends between and
through the lower stand parts 5, on which it is pivotably
journalled. Two connecting arms 32 are rigidly connected
to the synchronization shaft 31 at both its ends and are
pivotably connected to the primary arms 24 at their lower
mounting parts 26. The movements of the primary arms 24
about their axis of pivot are thus synchronized with each
other.
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Each primary arm 24 comprises a tongs-like gripping
member 33, comprising a first, outer locking arm 34 and a
second, inner locking arm 35. The expression "outer" and
"inner" refer to positions in relation to each other and
5 to the surface winding drum 11. The outer locking arm 34
is pivotably journalled on the upper mounting part 27 of
the primary arm 24 by means of a horizontal journalling
shaft 36. The inner locking arm 35 is pivotably
journalled on the same journalling shaft 36 as the outer
10 locking arm 34. The outer locking arm 34 comprises a
waist part 37, with which it is pivotably journalled on
said journalling shaft 36, a free gripping part 38 for
contacting the reeling drum 2 and a mounting part 39. In
the embodiment shown, the gripping part 38 is in the
shape of a hook, which in the locked position surrounds
the bearing housing 4 of the reeling drum 2 with a
certain sector angle, for instance about 90°. The hook 38
and the mounting part 39 are located on either side of
said journalling shaft 36. The inner locking arm 35,
likewise, comprises a waist part 41, with which it is
pivotably journalled on said common journalling shaft 36,
a free gripping part 42 for contacting the reeling drum 2
and a mounting part 43. The free gripping part 42, which
acts as a counter-support for the reeling drum 2 and the
hook 38 in its locked position, and the mounting part 43
are located on either side of said common journalling
shaft 36.
The gripping member 33 of the primary arm 24 comprises a
first double-acting hydraulic cylinder 44 and a second
double-acting hydraulic cylinder 45. The first hydraulic
cylinder 44 is, via its piston-rod 46, pivotably mounted
to the mounting part 39 of the outer locking arm 34 by
means of a shaft pin 47 and, via its cylinder 48, at the
end of the cylinder 48 facing the piston-rod 46,
pivotably mounted to the mounting part 43 of the inner
locking arm 35 by means of two opposite shaft pins 49. A
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symbolically indicated, flexible pipe 50 for supplying
hydraulic oil to and evacuating it from said first
hydraulic cylinder 44 is provided with a valve 51, which
in practice is mounted on the hydraulic cylinder 44, for
disconnecting said supply when the hydraulic cylinder is
in a certain protruding position. The first hydraulic
cylinder 44 extends freely with its cylinder 48 upstream
of and along the upper mounting part 27 of the primary
arm 24, i.e. it has solely mechanical, pivotable contact
with the inner locking arm 35, which thus carries the
hydraulic cylinder 44.
Said second hydraulic cylinder 45 is, via its piston-rod
52, pivotably mounted to the gripping part 42 of the
inner locking arm 35 by means of a shaft pin 53, located
at a pre-determined distance from the journalling shaft
36 of the gripping member, i.e. the common journalling
shaft of the locking arms 34, 35, and, via its cylinder
54, at its end facing away from the piston-rod 52,
pivotably mounted to the upper mounting part 27 of the
primary arm 24 by means of a shaft pin 55. On the inside,
the hook 38 of the outer locking arm 34 has a surface 60
that is inwardly-curved or angled towards the
drum-contacting gripping part 42 of the inner locking arm
35 in such a way that the distance between the free ends
of the locking arms 34, 35 facing each other, when the
gripping member 33 is in its active, locked position, is
smaller than the diameter of the bearing housing 4 of the
reeling drum 2 so that the reeling drum 2 is retained by
the gripping member 33, even when it is facing downwards
with its said free ends.
The inner end wall 14 of each bearing housing 13 is
extended upwards to carry a support 56 with an upper
surface for receiving the reeling drum from the lowering
arms 17, with the supports 56 being positioned inside the
grooves 40 of the bearing housings 4. Each support 56 has
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a rearward stop 57, arranged to prevent the reeling drum
2 from rolling backwards when delivered. The supports 56
are located at such a level above the surface winding
drum 11 that they carry the entire weight of the reeling
drum 2 without loading the inner locking arms 35 and
their hydraulic cylinders 45, although the locking arms
34, 35 are in contact with the bearing housings 4 of the
reeling drum during this concluding phase of the lowering
operation.
In the embodiment shown, the outer locking arm 34 of each
gripping member 33 is constructed out of two parallel
plates 58, arranged a certain distance from each other
for co-operation with the bearing housings 4 of the
reeling drum 2 on either side of its groove 40. The
plates 58 are held rigidly in position by means of an
intermediate part 59.
In the closed, locked position of the gripping member 33,
when its locking arms 34, 35 surround the bearing
housings 4 of the reeling drum 2 and the valve 51 is in
the closed position so that the piston-rod 46 cannot be
returned into the cylinder 48, the two locking arms
34, 35 of the gripping member 33 form a pivotable unit,
which is pivotable about the journalling shaft 36 by
means of the second hydraulic cylinder 45, which thus
forms part of the system for controlling the linear load
between the initially growing paper reel 3 and the
surface winding drum 11. The pivotable unit also includes
the first hydraulic cylinder 44.
The reel-up described above operates substantially as
follows.
In the phase of a reeling-up process in progress shown in
Figure 2, the primary arms 24 are in their top positions
and their gripping members 33 are in their open positions
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for receiving an empty reeling drum 2, which is collected
by the lowering arms 17 and placed on the two supports
56, see Figure 7, whereupon the first hydraulic cylinders
44 are activated to pivot the outer locking arms 34
downwards to abut the bearing housings 4 of the reeling
drum 2 so that said bearing housings are securely clamped
between the outer and inner locking arms 34, 35, as shown
in Figure 4. When the gripping members 33 are in their
closed position, the valves 51 are activated so that the
oil supply pipes 50 are closed and the outer and inner
locking arms 34, 35 are fixed in relation to each other
by each piston-rod 46 being held securely locked in its
protruding position. As the first hydraulic cylinders 44
lack mechanical connection with any structural element
other than the gripping members 33, each gripping member
33 and its hydraulic cylinder 44 form a pivotable unit,
pivotable.about the journalling shaft 36 by activation of
the second hydraulic cylinder 45. In the phase of the
reeling-up process shown in Figure 4, a paper reel 3 has
been completed in the secondary system. The empty reeling
drum 2 in the primary system is caused to rotate by means
of said starting device not shown. The hydraulic
cylinders 28 of the primary arms 24 are activated to
pivot the primary arms 24 to the rail position, as shown
in Figure 5. During this pivoting movement, the reeling
drum 2, at this stage already rotating, is moved to abut
the surface winding drum 11, whereby the paper web 1 is
brought into contact with the reeling drum 2 for wrapping
and initiation of the reeling up. The paper web 1 is torn
and the secondary carriages 20 are activated to transport
the completed paper reel 3 away from the surface winding
drum 11, as also shown in Figure 5. The reeling drum 2,
held by the gripping members 33 of the primary arms 24,
meets the surface winding drum 11 at a pre-determined
initial angle position and a pre-determined linear load
is set with the assistance of the control system of the
reel-up via the second hydraulic cylinders 45. The weight
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of the reeling drum 2 and the turns of the paper web 1
wound onto it have an effect on the linear load, from
maximum influence in said initial angle position to no
influence at all in the rail position in accordance with
Figure 5. To maintain the pre-determined linear load, the
second hydraulic cylinders 45 will initially unload the
surface winding drum 11 from the influence of part of the
weight of the reeling drum 2, which unloading effect
gradually diminishes as said influence diminishes. At a
given angle position, depending on the value of the
pre-determined linear load, the hydraulic cylinders 45
switch from a controlled, unloading function to a
controlled, loading function, so that the reeling drum 2
will press against the surface winding drum 11 with
gradually increasing force, depending on the angle
position, to maintain the pre-determined linear load. The
inner hyd-raulic cylinder 45 also compensates for the
continuous increase in diameter of the paper reel 3,
which occurs while the reeling drum 2 is pivoted down to
the rail position by the primary arms 24, by
synchronously pivoting the two units and the reeling drum
2 held by said units, although still rotatable, so that
the distance between the axis of rotation of the reeling
drum 2 and the axis of rotation of the surface winding
drum 11 increases.
The angle positions of the primary arms 24 relative to a
defined starting position are suitably sensed by a
position detector in one of the hydraulic cylinders 28 of
the primary arms 24. After recalculation, this provides a
more precise value for the angle position than an angle
indicator which measures the angle position of the
primary arm directly during its pivoting movement.
As the weight of the reeling drum 2 is known and does not
vary significantly from one to another, the control
system of the reel-up can be pre-programmed with a curve
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chart relating to the value of the vertical force
component as a function of the angle position in relation
to the surface winding drum 11.
5 When the secondary carriages 20 have delivered the
completed paper reel 3 at the downstream end of the
reel-up, they revert to their starting positions in
proximity to the surface winding drum 11 to receive and
retain the next reeling drum 2 with their gripping
10 members 21, 22, shortly after the phase shown in
Figure 6.
As the gripping members 33 of the primary arms 24 retain
the reeling drum 2 in its two bearing housings 4, the
15 latter cannot rotate. Consequently, the bearing housings
4 cannot, in their locked position, be brought into
direct contact with the rails 9, if friction is to be
avoided. The downward pivoting movement of the primary
arms 24 must therefore be halted before the bearing
housings 4 contact the rails 9. Such a halt occurs when
the distance between each bearing housing 4 and rail 9 is
one or a few millimetres. The hooks 38 of the outer
locking arms 34 encompass the bearing housings 4 from
below when the gripping members 33 are in the rail
position, which means that the hooks 38 carry a
substantial part of the weight of the reeling drum 2 in
this rail position. The reeling-up process continues with
a controlled linear load when the primary arms 24 are in
this position until the secondary carriages 20 take
control of the reeling-up operation. The returning
movement of the secondary carriages 20 towards the
surface winding drum 11 is halted by the position
indicators 23 a certain distance before the press arms 22
of the secondary carriages 20 reach the bearing housings
4, thus preventing an instantaneous increase in the
linear load, more precisely a doubling, which would occur
if the gripping members of the secondary carriages 20
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were to continue in the direction towards the bearing
housings 4 to take control of the linear load directly.
By halting the secondary carriages'20 in the manner
described, the paper reel 3 is allowed to "grow into" the
system for control of the linear load of the secondary
carriages 20, i.e. the diameter of the paper reel 3
continues to increase whilst the linear load is
controlled by the primary system until the bearing
housings 4 of the reeling drum 2 with the growing paper
reel 3 meet the press arms 22 of the secondary system, as
illustrated in Figure 6. A smooth transition from the
primary to the secondary loading system is thus achieved.
The inner surfaces of the hooks 38, which surfaces
contact the bearing housings, are angled and incline
obliquely downwards, towards the rails 9, and, when the
gripping members 33 are opened by the valves 51 being
opened and the first hydraulic cylinders 44 activated,
the reeling drum 2 is lowered relatively slowly towards
the rails 9, in that the bearing housings 4 follow the
tilted surfaces 60 of the hooks 38 in a vertical
movement, correspondingly slow relative to the opening
movement of the outer locking arms 34. In this way, a
desirable gentle lowering of the reeling drum 2 onto the
rails 9 is achieved. At this stage, the locking arms 21
are turned up into their locked positions against the
bearing housings 4, while, simultaneously, control of the
linear load ceases in respect of the primary system and
is taken over by the secondary system.
The second hydraulic cylinders 45 are of a low-friction
type to achieve the greatest possible sensibility in the
control of the linear load.
Secondary arms can be used instead of secondary
carriages 20.
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Pneumatic cylinders or, if possible, other types of
actuators, can be substituted for the hydraulic cylinders
described above, if so desired.
Apart from the indicators 23, indicators are arranged in
a plurality of other locations in the reel-up to detect
different positions for other movable structural elements
to obtain data for controlling the reeling-up process
during desired phases.
In the preferred embodiment described above and shown on
the accompanying drawings, the axis of pivot of the
primary arms 24 is co-axial with the axis of rotation of
the surface winding drum 11. If so desired, however, the
axis of pivot of the primary arms can be eccentrically
arranged in relation to the axis of rotation of the
surface winding drum. The gripping part 38 of the outer
locking arm 34 is shaped as a hook, while the contact
surface of the gripping part 42 of the inner locking arm
35 has a more straight or slightly inwardly-curved shape.
Although this embodiment is preferred, it is possible to
reverse the locking arms 34, 35 with reference to their
free gripping parts 38, 42 or to shape both gripping
parts as hooks or the like, for instance hooks with the
same enclosing arc of the bearing housings 4, but a
somewhat smaller enclosing arc for each of them than in
the hook 38 shown.
The invention can also be applied to a reel-up, the
secondary system of which has at least one secondary unit
with two secondary bodies that are journalled on the
stand parts for linear movement and have lifting devices
for lifting the reeling drum up from the stand rails and
supporting the reeling drum during the reeling-up of the
paper web. The invention can further be applied to a
reel-up with twin secondary units lacking the
above-mentioned lifting devices.
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In the embodiment shown, the support means consists of a
surface winding drum. In an alternative embodiment (not
shown), the support means consists of a belt or of a
combination of surface winding drum and belt.
15
25
35
