Note: Descriptions are shown in the official language in which they were submitted.
~0~9193
90-453
APPARATU8 FOR THE 8PREADING OF CONPO~ENT R~B8
BAC~GROUND OF T~æ INVENTION
The invention concerns an apparatus for spreading of
component webs, comprising a first, bowed, revolving roll fitted at
one side of the web and a second, bowed, revol~ing roll fitted at the
opposite side of the web, as well as a swing mechanism, which is
fitted to act upon these rolls so as to alter the deflection angles
of the component webs and thereby to reduce the desired spreading of
the ~omponent webs.
By means of spreading of the component webs, attempts are
made to separate the individual strips slit, e.g., in a slitter in
the lateral direction sufficiently far from each other to ensure
detaching of the reels from each other. In the spreading of the
component webs, the objective is to perform the lateral shifting of
the web so that lateral gliding of the web in the spreader member is
avoided, by guiding the web by means of a first spreader member by
deflecting the web towards the side and by means of a second spreader
member so that its original running direction is restored. In the
prior art, as spreader members, for example, rods, beams or revolving
roll mantles mounted on an axle bent into curved form have been
employed. A revolving roll mantle may be composed, e.g., of rigid
mantle units, or it may be continuous and elastic. The mantle units
may also be separate. In a spreader with a revolving mantle, the
problem is, however, often encountered that the direction of movement
of the web and the vector of rotation that represents the rolling of
the revolving roll mantle are, at least at some location on the
mantle, placed obliquely to each other. In such a case, the web is
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affected by a force component which attempts to shift the web by
sliding on the roll mantle in the axial direction corresponding to
the longitudinal direction of the roll mantle.
As is well known, the extent of the separation gap between
the component webs is adjusted either by altering the curve radius,
by altering the gap between the rolls or the gap between the spreader
members, or by altering the deflection angle of the web. If the size
of the spreading gap is adjusted by altering the distance between the
spreader members, this affects the size of the machine concerned, and
thereby the use of this possibility of regulation is complex. ~f
regulation based on alteration of the curve radius is used in the
spreading of the component webs, the use of this mode of regulation
requires very high precision, for even a little change in the curve
radius has a strong effect on the distance between the component
webs.
The commonest mode of adjusting the magnitude of the
separation gaps between the component webs is to perform it by
adjusting the angle of deflection of the web across the spreader
members. In such a case, the web makes a steeper or less steep angle
when it passes over the spreader members, whereby the distance
between the component webs is changed.
When the angles of deflection of the web at the spreader
devices are altered, the directional angles of the arcs relative to
the web are also altered. A change in the directional angle of an
arc causes a lateral component of rolling in the web, which causes
problems, because the slide friction force between the web and the
spreader rolls causes disturbance in the spreading. As is well
known, the directional angles have been adjusted manually, which is
slow and difficult.
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8UMNARY OF THB INVBNTION
An object of the present invnetion is to provide an
apparatus for spreading of component webs wherein the factors
explained above do not cause problems, because the correcting of the
directional angle is mechanically positively controlled.
In view of achieving the objects stated above and those that
will be explained hereinafter, the apparatus in accordance with the
invention is mainly characterized in that the device is provided with
a regulation mechanism, which is fitted to correct the directional
angle between these rolls and the web to the desired value with all
values of the deflection angle.
By means of the apparatus in accordance with the invention,
the directional angles between the arcs in the spreader members and
the web are automaticaily regulated to the correct values when the
deflection angles of the web are adjusted as the amount of spreading
is being increased or reduced.
BRI~F DE8CRIPTION OF T~F DRA~ING8
In the following, the device in accordance with the
invention will be described in more detail with reference to the
Figures in the acco~panying drawings.
Figure 1 is a schematical illustration of the deflection
spreader as viewed from below.
Figure 2 is a schematical side view of the deflection
spreader and of its control qualities.
Figure 3 is a schematical illustration of a device in
accordance with the invention.
D~C~IPTION OF T~F PRFF~RRFD RNBODI~æNT~
In Fig. 1 it is shown schematically how the slit component
webs Wl, W2~..Wn_l, Wn arrive at the first spreader roll 10
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in a direction in which the mantle of the roll 10 rolls directly in
the direction P of running of the web W. The component webs
Wl...Wn are turned around the arc 10' of the roll lO (Fig. 2) in
the direction R1o of rolling of the first roll 10 being at the same
time deflected outwards, each component web Wl...Wn in its own
direction Pl, P2...Pn. Gaps C are opened between the component
webs Wl...Wn. Each component web Wl...Wn arrives at the
second roll 11 in the direction Rll of rolling of the mantle, being
turned along with the mantle to be original straight direction P of
running. The component webs W1...Wn are detached from the second
spreader roll ll, and there are the necessary separation gaps C
between the component webs Wl...Wn.
Fig. 2 is a schematical illustration of ~uantities that
affect the deflection spreading. In the Figure, the web is denoted
with the reference W, the web running below the first spreader roll
10 while its arc 10' spreads the web into component webs
Wl...Wn. Hereupon the component webs Wl...Wn run over the
second spreader roll 11, whose arc 11' turns the component webs
Wl...Wn into their original direction P of running (Fig. 1). In
the Figure, the curve radii of th spreading arcs 10', 11' are denoted
with the references rl, r2. The distance between the spreader
rolls 10, ll is denoted with the reference l. The deflection angles
of the web W across the rolls 10, ll are denoted with the reference
bl, b2, and the directional angles of the spreading arcs lO', ll'
relative to the web W are denoted with gl and g2.
Fig. 3 is a schematical illustration of an exemplifying
embodiment of the invention as applied in a carrier-drum slitter 20.
The web W is introduced in a ~nown manner, guided by the guide rolls
31, 32, 33, into the device in accordance with the invention, from
2Q29~ 93
which the component webs are passed, in this embodiment, into a
carrier-drum slitter 20, by the intermediate of a first roll 21 and a
second roll 22, to be wound into a roll 23. In this exemplifying
embodiment, the device for spreading of the component webs
W1...Wn consists of two bowed revolving rolls 10, ll and of a
swing mechanism 15, 16, 17. By means of a regulation mechanism 12,
13 the directional angles gl, g2 (Fig. 2) of the revolving, bowed
rolls 10, 11 are corrected to the desired values when the spreading
is adjusted by means of the swing mechanism 15, 16, 17. The
adjustment of the spreading or separation takes place by means of a
known technique so that the piece 15 is turned by means of a jack 16
around an articulated joint 17, whereby the deflection angles bl,
b2 of the paper web W across the rolls 10, 11 become larger or
smaller.
As is shown in Figs. 1, 2 and 3, the device comprises a
first, bowed, revolving roll 10 fitted at one side of the web W and a
second, bowed, revolving roll 11 fit~ed at the opposite side of the
web W. The device further comprises a swing mechanism 15, 16, 17, by
whose means the rolls 10, 11 are affected to alter their deflection
angles b1, b2 and thereby to provide the desired spreading
distance C for the component webs Wl...Wn. The device is
provided with a regulation mechanism 12, 13 which corrects the
directional angles g1, g2 of the rolls 10, 11 and of the web W to
correct values. This regulation mechanism 12, 13 may be composed,
e.gO, of articulation arms 12, 13, as is shown in Fig. 3. The
directional angles gl, g2 are adjusted by means of the
articulation arms 12, 13 so that the directional angles gl, g2 f
the rolls lO, 11 relative to the web W are always invariable,
preferably 90. The rolls 10, 11 that are used as spreader members
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\
may be fragmentary rolls or continuous, bowed rolls, or the
equivalent.
The device in accordance with the invention is suitable for
use in the spreading of component webs of a variety of web
materials. The web material may consist of plastic film, fabric,
paper, metal sheet, cardboard, or of equivalent material~
Above, the invention has been described with reference to
one advantageous exemplifying embodiment only. This is, however, by
no means supposed to confine the invention to this exemplifying
embodiment alone, but many variations and modifications are possible
within the scope of the inventive idea defined in the following
patent claims.
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