Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
This invention rela-tes to a method for changing wound
rolls and winding sleeves on centreless winding machines, wherein
the fully wound roll is pushed away, a ~inding sleeve is inserted,
the strip of material is severed and secured to a winding sleeve,
and the wound roll is taken away.
Various methods are known for changingwound rolls and
winding sleeves on centreless winding machines, that disclosed in
German oS 27 09 684 being used here as a generic example. In
this known method, the fully wound roll is lifted slightly off a
~0 carrier rol]. ~ winding sleeve is allowed to roll through the
gap thus formed into the gap between the carrier rolls. The
wound roll then returns to its original position in the carrier
roll bed, after which it is pushed away over the other carrier
roll. The strip of material is then secured to the winding
sleeve by a device which is swung in, and the strip of material
is then severed.
The disadvantage of this known method is that only wind-
ing sleeves of a certain size may be inserted, i,e. those which
fit into the nip between the carrier rolls before the wound roll
is ejected. Since this nip is relatively small, the known method
i5 used only for winding paper onto sleeves~
The method according to ~erman OS 27 09 684 cannot be
used ~or winding cardboard, ~hich is wound onto large diameter
sleeves. The same applies to another known method (German OS
26 38 368) in which the winding slee~e is pushed, in the direction
of the carrier roll axes, into the nip ~ormed between the carrier
rolls and the wound roll. A-~ter the latter has been ~d, the
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strip o~ material can be secured to the winding sleeve and, after
it has been severed, the wound roll may be taken away.
German Patent 21 18 963 discloses another method which is
more complex. In this case the wound roll is pushed away, the
strip of material is severed, the wound roll is taken away, and
the start of the strip of material is glued to the winding sleeve.
However, this method requires that the two carrier rolls be
separated in order to move the windin~ sleeve between the carrier
rolls into the carrier roll bed. The necessary mobile mounting
for the carrier rolls is relatively costly.
Severing the strip of material and taking the wound roll
away be~ore the sleeve is inserted into the carrier roll bed
raises the di~ficulty of holding the start of the new strip of
material, produced a~ter the strip is severed, which must be
secured to the new winding sleeve. In the case of automatic
changing equipment this is essential. In the case o~ the
apparatus disclosed in German OS 29 20 707, this problem is
solved in that the start of the new strip of makerial; produced
after the strip has been severed, is caused to adhere to the
periphery o~ a carrier roll by means o~ a vacuum produced in the
said carrier roll. However, the necessary equipment i5
relatively costly.
It is the purpose o~ the present invention to provide a
method which will permit automatic wound roll winding sleeve
changeovers, using sleeves o~ dl~erent diameters, to be carried
out in the simplest possible manner, i.e~ with simple means and
in the shortest possible time.
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According to the invention there is provided a method for
changing wound rolls and winding sleeves on centreless winding
machines, wherein the fully wound roll is pushed away, a winding
sleeve is inserted, the strip of material is severed and secured
to the winding sleeve, and the wound roll is taken away,
characteri~ed in that the winding sleeve is inser-ted from the
side to which the wound roll was ejected and is therefore partly
encircled by the slackened strip of materlal, whereupon the
latter is severed and is attached to the winding sleeve.
The method according to the invention has the advantage
of making it possi~le to insert winding sleeves of almost
unlimited diameter. This is achieved by ejecting the fully wound
roll into a position which does not interfere with the insertion
of a new winding sleeve. Since the windlng sleeve is inserted
into the machine on the s~me side from which the wound roll was
ejected, it is partly encircled by the strip of material, which
allows the start of the strip produced after severing to be held
and facilitates the attachment thereof to the winding sleeve. It
is preferable for the strip of material to be glued, lmmediately
after the severing operation, gradually to the winding sleeve.
The method according to the invention may be carried out
with relatively simple means, somewhat like the sleeve inserting
and attachment device disclosed in German O~ 27 09 684.
The method of operation of the wound roll wlnding sleeve
changing device is explained here~nafter in greater detail in
conjunction with the different operating stages shown in Figures
1 to 5.
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Ejection-beam 1, including cutting device 2, is adapted
to pivot about the axis of carrier roll 3 by means of two levers
4 which are united by means o~ a rotationally rigid transverse
member 5. Levers 4 comprise guides 6 along which beam 1 is
displaceable, at right angles to the axis o~ carrier roll 3, by
means of a motor 7. Cutting device 2 also moves along guides 8
on beam 1, but in the axial direction of carrier roll 3.
The second component of the automatic changer ls sleeve
injector 9, which consists mainly of two levers 11 adapted to
pivot about the axis of carrier roll 10, the said levers being
united by means of a rotationally ri~id transverse member 12.
The said member accommodates insertion channels 14 adapted to hold
interchangeable winding sleeves of different diameters.
The means for securing strip o~ material 18 to winding
sleeve 13 are not shown in the drawing. The said means may be in
the form of an attaching device also arranged on ejection beam 1,
or of a device whic~ applies an adhesive strip by means of which
the strip of material 18 is ~lued to ~inding sleeve 13, In this
case, the adhesive device may be coupled to the cutting device,
thus moving jointly there~ith~
Figure 1 shows the starting-position prior to the change,
over.
As shown in Figure 2, wound roll 15 has been e~ected from
the carrier roll bed by a pivoting moti~n of levers 4 in the
direction of arrow 16, and has been t~ansferred to a lowering
platform 17. Strip of material 18 is drawn back. ~fter reaching
the forward terminal position (Figu~e 2), ejection beam 1 ~ay be
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pre-adjusted to any desired sleeve diameter by moving it along
guides 6.
Ejection beam 1 with cutting device 2 is then removed
from the carrier roll bed by pivoting levers 4 back in the
direction of arrow 21 (Figure 3). Some slack is now imparted to
the strip of material, for example by easing up on the brake or
by lowering platform 17 slightly. ~inding sleeve 13 is inserted
into the carrier roll bed by pivoting levers 11 (Figure 3).
Strip of material 18 now lies around a part of the periphery of
the said winding sleeve.
As shown in Figure 4, levers 11 of sleeve inserting
device 9 are pivoted back in the di~ection o~ arrow 19~ while
cutting device 2 is pivoted back again in the direction of arrow
16, thus occupying a position above the strip of material on the
upper surface of w~inding sleeve 13. In this position, the said
strip is severed by cutter 20 and is giued to winding sleeve 13.
Cutting device 2 may then be pi~oted back, with ejection beam 1,
in the direction o~ arrow 21, into the starting position shown
in Figure 5 and Figure 1~ Pressure roll 2 is lowered onto winding
sleeve 13 and the winding process may now be continued.
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