Winder for a papermaking machine

A winder for a papermaking machine comprising a cylinder over which there is guided the paper web which is to be wound-up. A reel-spool receives the wound-up paper roll or package and a contact or press device presses the reel-spool in the direction of the cylinder. An endless band arrangement is guided such that it extends over the cylinder between its surface and the paper web, the band arrangement in conjunction with the paper web being wrapped about part of the circumference or outer surface of the cylinder and extends between the cylinder and the reel-spool or, as the case may be, the paper roll or package wound upon the reel-spool. The band arrangement also encloses the paper roll or the reel-spool along part of its circumference.

BACKGROUND OF THE INVENTION 
The present invention relates to a new and improved construction of winder 
or winder apparatus for a papermaking machine, sometimes simply referred 
to as a paper machine, which is of the type comprising a cylinder over 
which there is guided the paper web which is to be wound-up, a reel-spool 
for taking-up the wound paper roll or package and a press or contact 
device for pressing the reel-spool in the direction of the cylinder. 
With a winding apparatus of this type, which is known in this field of 
technology under the designation "Pope roller" or "support 
cylinder-roller", it is possible with the aid of a driven cylinder to 
wind-up the paper upon a reel-spool or the like. The reel-spool itself is 
not provided with any drive and is merely driven by friction. 
Additionally, it is possible by means of a simple change mechanism to doff 
or remove a fully wound paper roll and to infeed a new reel-spool upon 
which there is then continued the winding operation. 
These winders generally operate satisfactorily. However, when processing 
certain paper qualities, especially soft tissue paper, difficulties arise. 
Thus, when winding-up tissue paper the formed paper roll is wound too 
loosely, so that there exists the danger that it tends to slide laterally. 
Therefore, it is not possible to obtain the desired taut winding or wound 
paper roll merely by carrying out the usual change in the contact force. 
SUMMARY OF THE INVENTION 
Therefore, it is a primary object of the present invention to provide a new 
and improved construction of winder apparatus for a paper machine which is 
not associated with the aforementioned drawbacks and limitations of the 
prior art equipment as discussed above. 
Another and more specific object of the present invention is to provide a 
new and improved construction of a winder apparatus of the previously 
mentioned type, by means of which, while employing extremely simple means, 
there can be produced the desired taut, however not too tight winding of 
the paper web upon the reel-spool, and further, effectively avoiding the 
aforementioned drawback of lateral sliding or slippage of the paper roll 
during the winding operation and during transport. 
Still a further significant object of the present invention aims at 
providing a new and improved construction of winder for paper machines 
which is relatively simple in construction and design, economical to 
manufacture, extremely reliable in operation, provides for properly wound 
packages of paper upon a reel-spool, is not readily prone to breakdown or 
malfunction, and requires a minimum of maintenance and servicing. 
Now in order to implement these and still further objects of the invention, 
which will become more readily apparent as the description proceeds, the 
winder apparatus or winder of the present development is manifested by the 
features that there is provided an endless band arrangement guided over 
the cylinder between the surface thereof and the paper web. This band 
arrangement in conjunction with the paper web is trained or wrapped about 
the cylinder along part of its circumference. Further, this band 
arrangement is guided between the cylinder and the reel-spool or the paper 
roll which is wound thereon, as the case may be, and such band arrangement 
also is trained or wrapped about part of the circumference of the paper 
roll or the reel-spool. 
Preferably, the band arrangement, considered with regard to the direction 
of travel of the paper web, is guided in such a manner in front of the 
cylinder along the paper web which travels towards the cylinder that the 
paper web, prior to coming into contact with the cylinder, bears upon the 
band arrangement which is preferably in the form of a filter band e.g. a 
perforated band or sieve. Due to this measure there can be avoided the 
disturbing fluttering of the paper web in front of the cylinder, i.e., at 
its infeed side, which arises in many instances. 
Moreover, the section where the paper web bears upon the band arrangement 
can be provided with a pneumatic holder or adhering device. This holder or 
adhering device can be constituted, for instance, by a suction box or 
equivalent structure located at one side or face of the band arrangement 
or can comprise a blower device arranged at the side of the paper. 
It is also within the teachings of the present invention to design the 
winder such that during operation there exists a spacing between the 
surface of the cylinder and the wound paper roll or package. In such case 
the reel-spool together with the paper roll or package is solely driven by 
the band arrangement and not by frictional contact with the cylinder. This 
contributes to improving the winding operation. It is possible, with this 
construction, for the air at both sides or faces of the paper web and 
contained in the paper web itself to escape without being hindered, both 
before and during such time as the paper web is placed upon the prior coil 
wrapping or winding of the paper roll. 
It is preferable if the band arrangement is in the form of a filter or 
sieve band which insures for a uniform contact force over the entire width 
of the paper roll with simultaneous throughpassage of the air. However, it 
should be understood that a different construction is conceivable, for 
instance employing a multiplicity of narrow, parallel bands. In certain 
cases, where there is not attributed any particular significance to the 
air passage through the band arrangement, there can then be employed an 
air impervious or solid band or belt, for instance a rubber band or a felt 
band or the like.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
Describing now the drawings, in FIG. 1 there is shown in schematic 
simplified illustration a winder apparatus for a paper machine as 
contemplated by the teachings of the present invention. This winder 
apparatus will be seen to comprise a support cylinder 1, driven in known 
and therefore not particularly illustrated manner by any suitable drive. 
Additionally, the winder apparatus comprises a reel-spool 2 or equivalent 
wind-up member or core for the paper web. This reel-spool 2 bears by means 
of its journals 3 at opposed ends thereof upon guide means 4. Wound onto 
the reel-spool 2 is a paper roll or package 5 from a paper web 6 which is 
infed thereto by means of the support cylinder 1. The reel-spool 2 
together with the wound paper roll 5 is pressed in known manner by the 
contact or press arms 7, which for instance are controlled by a pneumatic 
servomotor 8 or equivalent drive, in the direction of the support cylinder 
1. To simplify the illustration there is only visible in FIG. 1 the parts 
of the winder apparatus, such as the portion of the guide means 4 and the 
one contact or press arm which is closer to the viewer of the showing of 
FIG. 1. 
During operation of this winder apparatus, which as concerns the parts 
thereof which have been just described above are conventional, the paper 
web 6 is delivered to the support cylinder and then guided from such 
cylinder 1 to the reel-spool 2 where it is wound-up into a paper roll or 
package 5. The reel-spool 2 and the paper roll 5 which forms thereon were 
heretofore driven by the frictional contact of such components with the 
surface of the support cylinder 1, and while under the action of the 
contact or press arms 7. Hence, as the diameter of the wound paper roll 5 
increased during the winding operation the arms 7 laterally shift, to 
enable the build-up of the paper roll or package 5. 
Also for reasons of simplifying the showing of FIG. 1, there have been 
conveniently omitted from the drawings parts of the apparatus which are 
not directly related to the teachings of the present invention, such as 
for instance the arms for the infeed of new reel-spools. Since such 
equipment is conventional and has no direct bearing on the underlying 
principles of the present invention it is unnecessary to further consider 
the same herein. 
Now according to the teachings of the present invention the winder 
apparatus is advantageously equipped with a band arrangement 10', 
preferably, although not absolutely necessary in all instances, 
constituted by a filter or sieve band or belt 10. This filter band 10 can 
be preferably a plastic filter or sieve unit, for instance formed of 
polyester. The filter band 10 is guided below the paper web 6 which is 
moving in a predetermined direction of travel into and through the winder 
apparatus and specifically towards and onto the support cylinder 1. Now 
such filter band 10 which moves below the paper web 6 is guided over the 
support cylinder 1, is wrapped or trained about at least a part of the 
surface or circumference thereof, as shown, then moves between such 
support cylinder 1 and the paper roll 5 and the reel-spool 2 and likewise 
partially wraps about the circumference or outer surface of the paper roll 
5 or the empty reel-spool 2, as the case may be. Additionally, the filter 
band 10 is guided over the guide rolls 11a, 11b, 11c, a tensioning roll 12 
as well as a control or regulating roll 13. The tensioning roll 12 
beneficially serves to maintain a certain tension at the filter band or 
filter means 10 and like the contact or press arms 7 can be loaded i.e. 
tension-controlled by the pneumatic servomotors 14 or equivalent 
structure. The control or regulating roll 13 serves in known manner for 
laterally guiding the filter band 10, so that such does not laterally 
shift out of its working zone at the support cylinder 1 and the guide 
rolls 11a, 11b, 11c. 
As also apparent by referring to FIG. 1, at the section S, extending 
between the guide roll 11a and to the immediate run-on or infeed side of 
the support cylinder 1, with respect to the direction of movement R of the 
paper web 6, the filter band or filter means 10 is guided along the paper 
web 6, so that such can snugly bear against such filter band 10. Below the 
filter band 10 there is arranged at the section S a schematically 
illustrated pneumatic holder or adhering device, here shown in the form of 
a suction box 15 which insures for the proper contacting relationship of 
the paper web 6 against the filter band 10 in this section S. 
During operation the paper web 6 is applied by the filter band 10 onto the 
paper roll 5 which is being formed along a path corresponding to the 
contact or wrap angle .alpha. and pressed against the paper coil or 
winding which has already been last-formed upon the paper roll or package 
5. The air entrained by the soft tissue paper, which partially is located 
between the fibers thereof, can escape, so that there is produced the 
desired taut winding action. The reel-spool 2 and the paper roll 5 which 
is being formed is simultaneously driven by the filter band 10. 
The desired degree of tautness i.e., the density of the wound paper package 
can be influenced by the tensioning force of the filter band 10, i.e., by 
the contact force exerted by the servomotors 8 and 14. There can even be 
undertaken measures which have not here been particularly shown, for the 
purpose of varying such tensioning force during operation in a manner such 
that the same is different for different diameters of the wound-up paper 
rolls 5. Thus, for instance, at the start of the winding of the paper roll 
or package 5 there can be provided a greater pressure between the filter 
band 10 and such roll 5 than towards the end of such winding operation. 
Since the reel-spool 2 and the paper roll 5 are driven by the filter band 
10 there is not absolutely required any direct contact of the surface of 
the paper roll 5 with the paper web 6 bearing upon the support cylinder 1. 
In fact, it can even be advantageous if, according to the modified 
construction of FIG. 2, there is provided a spacing T between the surface 
or circumference 5' of the paper roll 5 and the surface or circumference 
of the cylinder 1, which spacing T is greater than the collective 
thickness V of the filter band 10 and the paper web 6. In this way there 
is beneficially obtained space for the escape of the air entrained by the 
paper web 6 to both sides, so that such air cannot become entrapped 
beneath the just wound wrapping or coil and disturb the winding operation. 
Although the invention has been described by way of example in conjunction 
with a band in the form of a filter or sieve band, it should be clearly 
understood that the band arrangement constituting the filter band also can 
be differently designed. Thus, for instance, there may be provided a 
plurality of narrow, parallely extending bands or belts. As also 
previously explained, in those instances where there is not placed any 
particular importance upon the air permeability or passage of air through 
the band arrangement, there can be used instead of the filter band 10 a 
rubber band or felt band or the like which extends over the entire width 
of the paper roll. The filter band 10 can be driven by the cylinder 1 or 
by one of the rolls over which it is guided, for instance one of the guide 
rolls 11a, 11b, 11c. 
While there are shown and described present preferred embodiments of the 
invention, it is to be distinctly understood that the invention is not 
limited thereto, but may be otherwise variously embodied and practiced 
within the scope of the following claims. Accordingly,