DRUM-TYPE WINDER FOR WINDING WEBS OF MATERIAL

BOBINEUSE-TOURET POUR BANDES DE PAPIER

English Abstract

Abstract
Drum-type winder for winding webs (5) of material,
especially webs of paper, with two drums that the reels rest
against while being wound. The winder has a freely rotating
attenuating roller (12) that extends across the operating
width, that can be applied more or less horizontally to the
reels (4.1 & 4.2), and that can be forced away from the
reels in opposition to an adjustable force.

Claims

Claims
1. Drum-type winder for winding webs of material,
especially webs of paper, with two drums that the reels rest
against while being wound, characterized by a freely
rotating attenuating roller (12) that extends across the
operating width, that can be applied more or less
horizontally to the reels (4.1 & 4.2), and that can be
forced away from the reels in opposition to an adjustable
force.
2. Drum-type winder as in Claim 1, characterized in
that the adjustable countervailing force depends on
distance.
3. Drum-type winder as in Claim 2, characterized in
that the countervailing force is friction.
4. Drum-type winder as in one of Claims 1 through 3,
characterized in that the attenuating roller (12) is secured
to pivoting arms (10) articulated to the frame (1) above the
winding site.
5. Drum-type winder as in one of Claims 1 through 4,
characterized in that a braking strip (14) is secured to the
pivoting arms (10) and subject to a braking mechanism (17).

6. Drum-type winder as in one of Claims 1 through 5,
characterized in that the attenuating roller (12) is divided
into individually mounted segments secured to a common
transverse pivoting arm (11).
7. Drum-type winder as in one of Claims 1 through 6,
with a rider that moves up and down above the drums,
characterized in that the attenuating roller (12) is in
circumferential contact with friction wheels (18) that rest
against the rider (7) before the reel (4.1) comes into
contact with the attenuating roller.

Description

2~1 7~7
DRUM-TYPE WINDER FOR WINDING WEBS OF MATERIAL
The invention concerns a drum-type winder for winding webs
of material, especially webs of paper, as recited in the
preamble to Claim l.
Experience demonstrates that reels, especially reels of soft
paper, wound on the generic drum-based winder known ~rom
German OS 3 207 461 are often not round and will accordingly
tend to jump around between the two drums while being wound.
The motion leads to irregular winding. Oscillations
increase the activity and soon lead to rips in the web. In
extreme cases the reels will leap out of the bed.
The present invention is intended to provide a generic drum-
type winder that will ensure smooth winding of even soft
types of paper.
This object is attained as recited in the body of Claim 1.
The subsidiary claims recite especially practical and hence
preferred embodiments of the invention.
The characteristic recited in Claim 2 makes it possible to
establish a countervailing force independent of the diameter
of the reel. Claim 3 recites how a countervailing force

2~7~:17
that is independent of distance can be generated by
friction. Claim 4 recites a supplementary component of
inherent weight.
Claims 4 through 6 recite practical embodiments of the
invention. The attenuating roller in the embodiment recited
in Claim 6 can be long and still rigid even though it has a
very short diameter. The attenuating roller in the
embodiment recited in Claim 7 is accelerated to the
circumferential velocity of the reel before coming into
contact with it. This measure prevents relative motions
that could cause the web to rip when contact is established
with the reel.
One embodiment of the invention will now be described with
reference to the highly schematic drawing, the single figure
in which is a side view of a drum-based winder in accordance
with the invention.
Mounted in the frame 1 of a winder are two driven drums 2
and 3, against which reels 4.1 and 4.2 rest during the
winding process. A web 5 of material, preferably of paper
and slit longitudinally into subsidiary webs, is deflected
up by drum 2, fed into the bed between the drums, and wound
on aligned cores. Mounted such that it can be moved up and
down in frame 1 is an arm 6 that extends over the operating

2~7~17
width. ~ecured to the bottom of arm 6 is a Ereely rotating
rider 7. Rider 7 rests against the apical line of reel 4.1
and presses down on the reel. The result extra weight on
drums 2 and 3 increases the tightness of reel 4.1 until it
becomes heavy enough to ensure its own tightness.
A double-drum windier of this type is known from German OS 3
207 461 for example.
Mounted on each side of the winder on an upper transverse
arm 9 on frame 1 is a pivoting arm 10. Both pivoting arms
10 terminate at a distance above drums 2 and 3. They
support a transverse pivoting arm 11 that extends over the
operating width. An attenuating roller 12 rotates freely on
the end of transverse pivoting arm 11 that faces reel 4.1.
Pivoting arms 10 are designed to force attenuating roller 12
more or less horizontally against reel 4.1 while the reel
still has a short diameter and to pivot back into an
inactive position out of the vicinity of a full reel 4.2.
The pivoting motion is caused by two piston-and cylinder
mechanisms 13 on each side, secured to both frame 1 and to
transverse pivoting arm 11.
Articulated to each end of transverse pivoting arm 11 is a
braking strip 14, the free end of which e~tends out and
rests in guides 15, which are secured to another arm 16 on

2 ~ 7
frame 1. Accommodated in guides 15 are friction structures
in the form of braking tongs 17 that can be subjected to
varying pressure and that in conjunction with braking strips
14 counteract in the capacity of a disX variably brake the
pivoting motion of attenuating roller 12.
Attenuating roller 12 is divided into individually mounted
segments, each approximately 1 meter long. Each segment in
this embodiment is in circumferential contact with at least
one friction wheel 18. Friction wheels 18, which are
mounted coaxial and also rotate freely on transverse
pivoting arm 11, are positioned such that, before
attenuating roller 12 comes to rest against the growing reel
4.1, friction wheels 1~ will come into contact with rider 7,
which rests against the reel. Rider 7 starts friction
wheels rotating, and the wheels accelerate attenuating
roller 12 to the circumferential velocity of reel 4.1.
eliminating any difference in motion when they come into
contact. Friction wheels 18 can be left out if the
difference in velocity that occurs with the acceleration of
attenuating roller 12 has no detrimental effects. To
eliminate as much inertia as possible, attenuating roller 12
is as light in weight as possible, and is preferably made
out of aluminum.
How the drum-type winder in accordance with the invention

2Q~7~:~7
operates will now be described.
Once the winding process has been commenced, arms 10 are
pivoted along with attenuating rollers 12 into the position
that corresponds to the diameter of reel 4.1 at which the
attenuation is supposed to take effect. The desired
friction is established on braking strips 14 with braking
tongs 17, generating the resistance that is to counteract
the motion of reel 4.1 or 4.2 away from drum 3. Before the
diameter of the reel increases to the extent that the reel
comes into contact with attenuating roller 12, the roller is
accelerated by the rider 7 that rests against it and by
friction wheels 1~ to the same circumferential velocity.
The growing reel 4.1 or 4.2 will then exert a radial and
outward force against the resistance of braking tongs 17.
The resistance can be adjusted to the desired level. It
prevents reels 4.1 and 4.2 from turning irregularly and
accordingly ensures uniform contact on the part of tha reels
and smooth winding.

Representative Drawing