Winder and method for the continuous winding of a material web

A winder for continuous winding of a material web, like a paper or board web, on a winding spool to form a wound reel. A contact pressure drum is rotatably supported on a displaceable transport device and the drum itself is displaceable with respect to the transport device to form a widening nip with the wound reel. The transport device also supports a primary bearing for holding an empty spool during the start of the winding process. The bearing for the empty spool is between the contact pressure drum and a secondary bearing for supporting the wound reel in the final winding position. The primary bearing for the initially empty spool is fixed in location on a transport device. The transport device is in turn transportable toward and away from the secondary bearing for the wound reel. The contact pressure drum is supported to move along with the transport device as well as also being displaceable with respect to the transport device to maintain the line pressure during increase in the wound spool diameter.

BACKGROUND OF THE INVENTION 
The present invention relates to a winder for continuously winding a 
material web, especially a paper or board web, and to a method for 
continuously winding a web. 
Winders and methods of the type addressed here are known from DE 196 07 
349, which is equivalent to U.S. application Ser. No. 08/807,485. The 
known winder comprises a contact pressure drum that is displaced by a 
pressure-applying device, to press the drum in a defined manner against 
the circumference of a wound reel and form a winding nip with the reel. 
The contact pressure drum is arranged on a first transport device that can 
be moved on a guide. The spool on which the wound reel is wound is 
rotatably held by a primary bearing as the winding process begins. The 
primary bearing can be translated with respect to the first transport 
device for the contact pressure drum with the aid of an additional second 
transport device. 
The winding machine further comprises a secondary stationary bearing, which 
holds the spool to rotate at a fixed position during the final winding 
process. 
At a spool change, an empty spool is introduced into the primary bearing, 
the material web is severed and its free end is wound onto the empty 
spool. During start of the winding, while the spool is being held by the 
primary bearing, the increasing wound reel diameter is compensated for or 
set by displacing the first transport device and controlling the line 
force in the winding nip between the contact pressure drum and the wound 
reel by relative movement of the contact pressure drum with respect to the 
first transport device. After it reaches a desired wound reel diameter, 
the wound reel is transferred into the secondary bearing where it is 
finally wound. 
Known winders are relatively complicated to construct and are thus of high 
cost. This is particularly caused by the second transport device that 
bears the primary bearing, because an additional control unit is necessary 
for controlling its displacement. When the wound reel is transferred into 
the secondary bearing, it is difficult to control the movement of the two 
transport devices synchronously such that at the same time the control of 
the line force is able to maintain the desired line force. Instead, there 
is the risk of a step change in the line force. 
DE 44 15 324 A1 which corresponds to U.S. Pat. No. 5,577,685 discloses a 
winder which has a first, horizontally movable transport device, to which 
a vertically movable second transport device is fitted. A contact pressure 
drum, which forms a winding nip with a wound reel, is rotatably supported 
on the second transport device. The drum can be moved backward and forward 
relative to the second transport device by a pressure applying device, in 
order to set the line force in the winding nip. A third transport device 
is also provided for transferring an empty spool from a ready position 
into the winding start position, which is located at a lower level. At a 
spool change, the contact pressure drum is first moved vertically upward 
into a transfer position. There the contact pressure drum forms a winding 
nip with an empty spool that is rotatably held on the third transport 
device. The material web is now severed and its free end is wound onto the 
empty spool. The spool is subsequently transferred, together with the 
contact pressure drum, into the winding start position located at a lower 
level. To this end, the second and the third transport devices are moved 
vertically downward. During the start of winding and the transfer into the 
winding start position, the new spool, together with the wound reel wound 
thereon which has only a few wound layers, is driven by means of a primary 
drive. From the winding start position, the wound reel is moved 
horizontally into a final winding position, in which the primary drive is 
uncoupled and a secondary drive is coupled to the wound reel. The 
secondary drive drives the wound reel during the further winding process. 
This winder has a relatively complicated construction, particularly 
because the second and third transport devices are displaceable 
independently of each other. Furthermore, control over the displacements 
of the three transport devices is very complicated. 
SUMMARY OF THE INVENTION 
It is an object of the present invention to provide a winder and a method 
of its operation without the foregoing disadvantages. In particular, the 
wound-on new spool should be displaceable into the stationary secondary 
bearing in a way which allows maintenance of a desired line force in the 
winding nip with the least possible effort during the displacement. 
In order to achieve this object, a winder for continuous winding of a 
material web, like a paper or board web, on a winding spool to form a 
wound reel has a contact pressure drum which is rotatably supported on a 
displaceable transport device and the drum itself is displaceable with 
respect to the transport device to form a winding nip with the wound reel. 
The transport device also supports a primary bearing for holding an empty 
spool during the start of the winding process. The primary bearing for the 
empty spool is between the contact pressure drum and a secondary bearing 
for supporting the wound reel in the final winding position. The primary 
bearing for the initially empty spool is fixed in location on the 
transport device. The transport device is in turn transportable toward and 
away from the secondary bearing for the wound reel. The contact pressure 
drum is supported to move along with the transport device as well as also 
being displaceable with respect to the transport device to maintain the 
line pressure during increase in the wound spool diameter. 
The winder has a primary bearing that is arranged in a fixed location on 
the transport device. Here, "fixed location" is provided by a bearing 
which holds the spool so that it can rotate and which prevents 
translational displacement of the spool on the transport device. The 
primary bearing and the contact pressure drum therefore have a single, 
common transport device. As a result, structure of the winder and its 
control can be simplified. 
A preferred exemplary embodiment of the winder is distinguished in that 
while the wound reel is being held by the secondary bearing as it is being 
finally wound, the increasing wound reel diameter is compensated for by a 
thrust device that displaces the transport device carrying the contact 
pressure drum. At the same time, the line force in the winding nip is 
controlled/regulated by relative movement of the contact pressure drum 
with respect to the transport device. A controller/regulator is provided 
for this purpose. It interacts with the pressure-applying device by which 
the contact pressure drum can be displaced. The displacement of the 
contact pressure drum relative to the transport device sets the pressure 
forces in the winding nip between the contact pressure drum and the wound 
reel. The contact pressure drum has a significantly lower weight than the 
wound reel, which becomes heavier with increasing diameter, so that rapid 
compensation of fluctuations and jumps of the line force or of the line 
force profile occurring in the winding nip is enabled. As a result, the 
line force can be set extremely finely, which enables a high winding 
quality to be achieved. 
The above-described control or regulation of the line force begins directly 
at a spool change and remains continuously effective, not only during the 
winding start process, but also during the common transfer of the new 
wound spool and the contact pressure drum toward the secondary bearing and 
during the following final winding process. The significant advantage of 
the invention arises from the control/regulation of the line force during 
the winding start process and during transfer of the wound spool into the 
secondary bearing being performed in a simple and precise manner by simply 
displacing the contact pressure drum by the pressure-applying device 
relative to the transport device. Automatic maintenance of the desired 
line force during the various steps is thus enabled without difficulty and 
without additional outlay. Only during the final winding process is the 
maximum stroke of the pressure-applying device generally insufficient to 
follow the increasing wound reel diameter. Then the thrust device, which 
is necessary in any case to displace the transport device, draws the 
transport device, including the contact pressure drum, the 
pressure-applying device and the now empty primary bearing, gradually away 
from the secondary bearing, corresponding to the increase in the wound 
reel diameter. 
In an advantageous embodiment of the winder, the primary bearing has a 
primary drive, preferably a center drive, for the wound reel. This drive 
applies a defined torque to the spool held by the primary bearing. The 
primary drive is preferably arranged in a stationary manner in a fixed 
location on the transport device. This enables the construction of the 
winder to be further simplified, since additional guide and transport 
devices are not needed for the primary drive. It is also possible to 
arrange the primary drive on a separate transport device and, when 
transferring the wound reel that is rotatably held by the primary bearing 
to the secondary bearing, to displace the primary drive at the same time 
parallel to the primary bearing. This arrangement enables torque to be 
applied to the spool during the entire winding process. As a result, in 
interaction with the above described control or regulation of the line 
force in the winding nip, a wound reel having a defined, preferably 
uniform winding hardness profile can be produced. 
In a method for continuously winding a material web, the material web is 
first led over a circumferential region of a contact pressure drum, which 
forms a winding nip with the wound reel. In order to prepare a spool 
change, a free draw of the material web is formed between the contact 
pressure drum and the almost finished wound reel. An empty new spool is 
introduced into the region of the free draw in a winding start position. A 
winding nip is then formed between the contact pressure drum and the empty 
spool by displacing the contact pressure drum with respect to a transport 
device which supports the contact pressure drum and the empty new spool. 
The material web is then severed and its free end is wound onto the new 
spool which at that time is located in its winding start position, with 
the control/regulation of the line force in the winding nip beginning 
immediately. To this end, the contact pressure drum is displaced in a 
defined way relative to the transport device. After a desired wound reel 
diameter is achieved, which in the case of a preferred embodiment is only 
slightly larger than the diameter of the empty spool, the wound reel is 
transferred into a final winding position, at which the wound reel is 
rotatably held in a stationary manner during the final winding process. 
During that transfer, control/regulation of the line force is continued 
without interruption. In addition, while the wound reel is now located in 
its final winding position, the line force in the winding nip is further 
controlled/regulated by relative movement of the contact pressure drum 
with respect to the transport device carrying the contact pressure drum. 
At the same time, the increasing wound reel diameter is preferably 
compensated for by relative movement of the transport device with respect 
to a base, for example, a foundation, on which the winder stands. 
The method described above achieves a desired hardness of the wound reel 
and hence a very good winding quality uniformly throughout the entire 
winding process. Furthermore, advantageously, as a result of displacing 
the contact pressure drum on the common transport device in order to 
control/regulate the line force in the winding nip, the increasing wound 
reel diameter is compensated for during the entire winding start process, 
including the transfer into the final winding position. The outlay for 
controlling the displacement movements of the contact pressure drum, wound 
reel and transport device during the entire winding process is therefore 
relatively low.

DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION 
A winder of the invention described below can generally be used for winding 
a material web. The winder may be arranged at the outlet end of a machine 
for producing or finishing a material web, for example a paper web, for 
winding up the finished material web to form a wound reel. However, the 
winder may also be used to rewind an already wound coil, also referred to 
as a wound reel. 
FIGS. 1 to 3 each show a side view of an exemplary embodiment of a winder 
1, which is used for winding a material web 3, for example a paper web, 
onto a spool. The spool can be formed, for example, from a tubular roll. 
FIGS. 1 to 3 disclose a sequence of functional steps of the winder 1. 
The winder 1 includes a transport device 5, also referred to as a carriage, 
which is movable along a first guide 9 comprised of guide rails 7. The 
side view of FIGS. 1 to 3 shows only one of the guide rails 7. The guide 
rails 7 are fastened to a winder frame 13 supported on a foundation 11, 
and the rails are aligned parallel to an imaginary horizontal H in 
dash-dot line. A thrust device 10 illustrated in FIG. 1, moves the 
transport device 5 on the first guide 9 to displace the transport device 5 
in the horizontal direction (double arrow 15). The thrust device 10 is 
fitted to the winder frame 13. The device 10 comprises a spindle drive, 
which comprises a threaded spindle 14 that is driven by a motor 12. It is 
also possible, for example, for a hydraulic piston/cylinder unit to be 
used as the thrust device. 
A primary bearing 17, which is illustrated schematically, is arranged on 
the transport device 5 in a fixed location. The bearing 17 is used for 
holding or for supporting a spool for rotating during the winding start 
process. The primary bearing 17 therefore has a fixed position on the 
movable transport device 5. The "winding start process" refers to the 
phase of the winding process in which a spool is held by the primary 
bearing 17. 
A contact pressure drum 19, also referred to as a supporting roll, is held 
rotatably on a guide carriage 20. That carriage is movable on a guide 23 
comprised of rails 21, of which only one rail 21 can be seen. The rails 21 
are fastened to the transport device 5 and preferably extend parallel, or 
at least substantially parallel, to the guide rails 7 of the first guide 
9. The guide carriage 20 can be moved along the rails 21 (shown by double 
arrow 25) by a pressure-applying device 22 that is fastened on the 
transport device 5. The pressure-applying device 22 is a preferably 
hydraulic, piston/cylinder unit, which comprises a piston guided in a 
cylinder. A piston rod is fastened to the piston. The other end of the 
piston rod is connected to the guide carriage 20 or, respectively, the 
bearing of the contact pressure drum 19 which is fastened to that 
carriage. The configuration of the pressure-applying device 22 is 
variable, so that in a different exemplary embodiment, the 
pressure-applying device 22 can be formed, for example, by a spindle 
drive. The contact pressure drum 19 may have an adjustable drive torque 
applied to it, by a center drive that is not illustrated in FIGS. 1 to 3, 
but which is arranged in a stationary fashion on the transport device 5. 
A stationary secondary bearing 27 is fastened to the winder frame 13. The 
secondary bearing 27 rotationally holds and guides a spool having a 
bearing journal 28, during the final winding process. In the winding phase 
illustrated in FIG. 1, the continuously incoming material web 3 is wound 
onto a spool 29 held by the secondary bearing 27 in order to form a wound 
reel 31. "Final winding process" refers to that part of the winding 
process during which the wound reel is held by the secondary bearing 27. 
The secondary bearing 27 has a secondary drive 32, which is indicated by a 
symbol, and which drives the spool that is held by the secondary bearing 
27. The secondary drive 32 is a center drive, which is fastened to the 
winder frame 13 and therefore has a fixed position within the winder 1. 
In addition, the primary bearing 17 has a primary drive 33, also indicated 
by a symbol, which applies a defined torque to the respective spool held 
by the primary bearing 17. In the winder embodiment in FIGS. 1 to 3, the 
primary drive 33 is arranged stationary on the transport device 5 and is 
displaced with the transport device 5. This means that no additional guide 
is needed for the primary drive 33. Therefore, the structure of the winder 
and its control can be simplified. In a different embodiment, the primary 
drive 33 is displaceable parallel to the rails 21 of the second guide 23, 
irrespective of the displacement movement of the transport device 5. 
FIG. 1 shows the material web 3 guided from the production or processing 
machine (not shown) arranged upstream of the winder 1, as viewed in the 
running direction of the material web 3 (arrow 34), first over a turn roll 
35 arranged in a fixed location, and then over a turn roll 37 which is 
rotatably mounted on the transport device 5. The web 3 is next guided over 
a third turn roll 39, which is arranged underneath the contact pressure 
drum 19 and is illustrated with dashed lines, to the contact pressure drum 
19. The turn roll 39 is preferably constructed as a web stretch roll. 
The material web 3 is guided over a circumferential region of the contact 
pressure drum 19 of about 180.degree. and is wound onto the wound reel 31 
which is held by the secondary bearing 27. The contact pressure drum 19 is 
pressed against the circumference of the wound reel 31 with a defined 
force forming a winding nip through which the material web 3 is guided. 
The line force, also referred to as clamping pressure or clamping force, 
in the winding nip is controlled by displacing the contact pressure drum 
19 on the second guide 23 in the directions of the double arrow 25. In a 
different embodiment of the winder, the line force in the winding nip may 
be regulated automatically to a desired value with the aid of a regulator. 
In both cases, the pressure-applying device 22, which cooperates with the 
guide carriage 20 carrying the contact pressure drum 19, is influenced in 
a defined manner. For example, in FIG. 1 a measuring device 67 and a 
control or regulating unit 68 are indicated schematically. By displacing 
the contact pressure drum 19, fluctuations in the line force can be 
compensated for or avoided, achieving a continuously desired winding 
hardness. The increasing diameter of the wound reel 31, while the wound 
reel 31 is held by the secondary bearing 27, is compensated for by 
displacing the transport device 5 and with it the contact pressure drum 19 
in the direction opposite to the web running direction (arrow 34), to the 
right in the illustrated embodiment. 
A pinch roll 41 or pressure roll is arranged underneath the wound reel 31 
that is held by the secondary bearing 27 and extends over the entire width 
of the wound reel 31. The roll 41 can be displaced by a guide device, not 
illustrated, to be pressed against the circumference of the wound reel 31 
that forms a winding nip with the contact pressure drum 19. (Compare FIGS. 
1 and 2.) The pinch roll 41 prevents air from being dragged between the 
winding layers of the wound reel 31, for example when the material web 3 
is being guided in a free draw. The pressure exerted by the pinch roll 41 
against the circumference of the wound reel 31 is adjustable. The pinch 
roll 41 may be driven by a drive, for example a center drive, preferably 
before and at least while the pinch roll 41 is pressed against the 
circumference of the wound reel 31 on the bearing 27. 
The operation of the winder 1 is explained below with reference to a 
winding process. The material web 3 is guided over the contact pressure 
drum 19 and is wound onto the wound reel 31 that is held by the secondary 
bearing 27 (FIG. 1). Before the wound reel 31 has attained its 
final/intended diameter, the pinch roll 41 is pressed against the 
circumference of the wound reel 31 (FIG. 2). This guides the material web 
3 both through the winding nip between the contact pressure drum 19 and 
the wound reel 31, and through the winding nip between the pinch roll 41 
and the wound reel 31. 
To transfer the continuous material web 3 onto an empty spool 43 that is 
arranged in a ready position above the contact pressure drum 19 (FIG. 1), 
the contact pressure drum 19 is moved to the right by the transport device 
5 along the rails 21 of the second guide 23, in a direction opposite to 
the running direction of the material web 3 (arrow 34) and also preferably 
at high speed. This increases the distances between the contact pressure 
drum 19 and the wound reel 31 creating a space 45 (FIG. 2). In the region 
of the space 45, the material web 3 is transferred in a free draw from the 
contact pressure drum 19 onto the wound reel 31. During the spool change, 
the pinch roll 41 is pressed against the circumference of the wound reel 
31 with a defined force. This both prevents the dragging of air between 
the winding layers of the wound reel 31 and assures that an exact hardness 
of the winding layers wound onto the wound reel 31 can be achieved. 
Next, the empty spool 43 is introduced from above into the interspace 45 
between the contact pressure drum 19 and the wound reel 31. Before the 
spool 43 is moved against the material web 3, which is being guided in a 
free draw, the spool is accelerated to the running speed of the material 
web 3 by a throw-on device, not illustrated. Movement of the empty spool 
43 into the free web draw deflects the material web 3 and guides the web 
over a circumferential region of the spool 43. The spool 43 is introduced 
directly into the primary bearing 17, which is arranged in a transfer 
position, and the new spool is rotatably held by the primary bearing 17 
(FIG. 2). The empty spool 43 is then rotationally fixedly connected to the 
primary drive 33. By displacing the contact pressure drum 19 against the 
spool 43, a nip or winding nip is formed between the drum 19 and the empty 
spool 43. The material web 3 is then severed at the free draw between the 
spool 43 and the roll 41 by a severing device, for example, a known high 
pressure blast device, not illustrated, and the free end of the web is 
wound onto the empty spool 43. While the spool 43 is held by the primary 
bearing 17, the increasing diameter of the wound reel 47 that is wound on 
the spool 43 (FIG. 3), and the line force in the winding nip between the 
wound reel and the contact pressure drum 19 is compensated for or 
controlled/regulated by displacing the contact pressure drum 19. The 
control/regulation of the line force to set a desired value also 
automatically compensates for the increasing wound reel diameter by 
defined displacement of the contact pressure drum 19 relative to the 
primary bearing 17 that is arranged in a fixed location on the transport 
device 5. 
As seen from FIG. 3, to transfer the wound reel 47 from the winding start 
position and at the primary bearing 17 into the final winding position, to 
the secondary bearing 27, the transport device 5 is moved in the web 
running direction (arrow 34). In the operational position of the winder 
illustrated in FIG. 3, the wound reel 47 is transferred from the primary 
bearing 17 to the secondary bearing 27. The secondary drive 32 is now 
coupled to the spool 43, on which the wound reel 47 is being wound, so 
that both drives 32 and 33 are briefly effectively connected to the spool 
43. Finally, the primary drive 33 of the primary bearing 17 is detached 
from the spool 43 and may be moved into its transfer position (FIG. 1). 
The duration of the winding start process, that is, the period when a wound 
reel is guided by the primary bearing 17, is variable. It can be a very 
short time, for example, so that the wound reel has an only relatively low 
diameter growth. As a result, the maximum stroke of the piston of the 
pressure-applying device 22 can be kept small. In a preferred embodiment, 
the maximum stroke of the piston is less than half the material layer 
thickness of a finished wound reel. It is preferable if the transport 
device 5 is at a standstill during the introduction of an empty spool into 
the primary bearing and during an adjustable period after the free end of 
the material web has been wound onto the empty spool. 
The method of operation readily emerges from the description of FIGS. 1 to 
3. It comprises the following. To prepare for a spool change, a free draw 
of the material web is formed between the contact pressure drum and the 
almost finished wound reel. Next, an empty spool is moved into a winding 
start position in the region of the free draw. Afterward, the contact 
pressure drum is relatively moved with respect to a transport device 
carrying the spool, and the drum is pressed against the circumference of 
the empty spool, forming a winding nip. The material web is then severed 
and its free end is wound onto the empty spool. To compensate for the 
increasing wound reel diameter, while the spool is located in the winding 
start position, the line force in the winding nip is controlled/regulated. 
For this purpose, the contact pressure drum is displaced. Then, the 
winding reel is transferred from the winding start position into the final 
winding position and continues to be wound here until winding is finished. 
During these processes, the control/regulation of the line force in the 
winding nip, by relatively moving the contact pressure drum with respect 
to the transport device carrying the contact pressure drum, is continued 
without interruption. The increasing wound reel diameter of the wound reel 
which is located in the final winding position is now preferably 
additionally compensated for by relative movement of the entire transport 
device 5 with respect to a base, the foundation 11. This enables the 
maximum piston stroke of the pressure-applying device 22, as already 
mentioned above, to be kept relatively small. 
FIG. 4 is a schematic plan view of the winder 1 of FIGS. 1 to 3. Identical 
parts are provided with the same reference symbols. The functional 
position in FIG. 4 corresponds to FIG. 2. The winder frame 13 has an outer 
part 13/1 and an inner part 13/2. The guide rails 7 of the first guide 9 
are fastened on the outer part 13/1 of the winder frame 13. 
A center drive 48 for the contact pressure drum 19 is arranged on the drive 
side of the winder 1 for applying torque to the rotationally mounted 
contact pressure drum 19. The center drive 48 is fitted to a bracket 49 
fastened to the transport device 5. It comprises a motor 51 and an 
articulated shaft 53, which is connected to a bearing journal of the 
contact pressure drum 19. The articulated shaft 53 enables the contact 
pressure drum 19 on the guide rails 7 to move relative to the transport 
device 5 and thus to move relative to the motor 51 that is arranged on the 
device 5 in a fixed location, without the drive train having to be 
interrupted, so that the articulated shaft 53 should be separated from the 
contact pressure drum or the motor. The contact pressure drum 19 therefore 
has a torque permanently applied to it. 
Furthermore, a bracket 55 is fastened to the transport device 5 on the 
front side of the winder 1 for carrying the primary drive 33 of the 
primary bearing 17. The primary drive 33 comprises a motor 57 which, as a 
double arrow 59 indicates, can be coupled to a replacement spool 43 guided 
by the primary bearing 17. 
A bracket 61 which supports the secondary drive 32 is fastened to the outer 
part 13/1 of the winder frame 13 on the drive side of the winder 1. The 
secondary drive 32 comprises a motor 63 which double arrow 65 indicates 
can be coupled to the spool 29 held by the secondary bearing 27. 
Arranging the primary drive 33 and the secondary drive 32 on opposite sides 
of the winder 1, i.e. the front side and drive side, respectively, enables 
a spool to have a torque applied to it during the entire winding process. 
This is explained below with reference to the transfer of the spool 43 
from the winding start position into the final winding position. 
Before the spool 43 that is being guided by the primary bearing 17 is 
transferred into the final winding position, the secondary drive 32 is 
separated from the spool 29 on which the finished wound reel 31 is being 
wound. The wound reel 31 is moved out of the secondary bearing 27, so that 
the spool 43 that is being held by the primary bearing 17 and driven by 
the primary drive 33 can be picked up. The spool 43 is transferred from 
the winding start position illustrated in FIG. 4 into the final winding 
position by displacing the transport device 5 in the direction of the 
arrow 34. Transfer of the spool 43 from the primary bearing 17 to the 
secondary bearing 27 then takes place. The secondary drive 32 is then 
coupled to the spool 43. This produces the operational position of the 
winder 1 illustrated in FIG. 3, in which both the primary drive 33 and the 
secondary drive 32 are simultaneously coupled and are effectively 
connected to the spool 43. After the secondary drive 32 has taken over the 
drive function for the spool 43, the primary drive 33 is uncoupled from 
the spool 43. The transport device 5 moves the primary drive back into the 
transfer position, in which a new empty spool can be taken over by the 
primary bearing 17. 
FIGS. 5 and 6 are schematic side views of a second embodiment of the winder 
1. Parts corresponding to those described in the preceding Figures are 
provided with the same reference symbols, so that reference can be made to 
the description relating to FIGS. 1 to 4. Only the differences are 
discussed below. 
The material web 3 is guided from a processing station for the material 
web, arranged upstream of the winder 1, to a turn roll 39' and from the 
roll 39' vertically upward to a contact pressure drum 19'. The drum 19' 
forms a winding nip against a wound reel 47 located in the winding start 
position. The previously finished wound reel 31 (with spool 29) is being 
simultaneously removed from the winder in FIG. 5. The contact pressure 
drum 19' in FIG. 5 is formed by a contact pressure roll which has a 
relatively small diameter relative to the reel 43. The diameter is 
distinctly smaller than the outer diameter of the contact pressure drum 19 
illustrated in FIGS. 1 to 4. The weight of the contact pressure drum 19' 
is preferably also lower than that of the drum 19. 
A displacement device 70 arranged on the guide carriage 20 has a guide 
frame 72 that is fastened to the guide carriage 20 and guides a vertical 
movable carriage 74 in the directions shown by a double arrow 76. The 
contact pressure drum 19' is rotatably held on the carriage 74 and is 
driven by a center drive (not illustrated), which is preferably arranged 
in a fixed location on the vertical carriage 74. Vertically downward 
motion of the vertical carriage 74 reduces the distance between the 
contact pressure drum 19' and the turn roll 39' that is supported 
stationary on the guide frame 72, as explained below. The vertical 
displacement travel of the contact pressure drum 19' is preferably 
relatively small, particularly one to two times the diameter of the 
contact pressure drum 19'. 
The operation of the winder 1 in FIGS. 5 and 6 is described below with 
reference to a spool change. First, an interspace, in which the material 
web is guided in a free draw, is formed between the contact pressure drum 
19' and a wound reel held by the secondary bearing 27. For this, the 
transport device 5 is moved to the right, into the position illustrated in 
FIG. 5. The contact pressure drum 19' is then displaced downward by 
lowering the vertical carriage 74, so that during the introduction of an 
empty spool 43 into the winding start position, the spool can be offset in 
the primary bearing 17 without deflecting the material web 3, which is 
being guided in a free draw from the contact pressure drum 19' to the 
almost finished wound reel 31 held by the secondary bearing 27, as seen in 
FIG. 6. This permits the empty spool 43 to be transferred to the primary 
bearing 17 during the running winding process, without the empty spool 
previously having been set rotating. This is a result of the spool 43 not 
coming into contact with the running material web. Only briefly and before 
a spool change, the new spool is accelerated to the web speed by the 
primary drive 33. The contact pressure drum 19' is then displaced 
vertically upward. This lays the material web 3 against a circumferential 
region of the empty spool 43 and the web is guided over the spool. A nip 
is then formed between the contact pressure drum 19' and the empty spool 
43 by horizontal displacement of the contact pressure drum 19'. The 
material web 3 is severed and its free end is wound onto the empty spool. 
During the winding start process (FIG. 5), the completed wound reel 31 is 
braked and then removed. The transport device 5 then moves to the left in 
FIG. 5 and transfers the wound new spool 43/47 to the secondary bearing 
27. This condition corresponds to that in FIG. 3. 
In a further embodiment, not illustrated, the nip or winding nip between 
the contact pressure drum 19' and the empty spool is already to be formed 
during the vertical displacement of the contact pressure drum 19'. 
Using the vertically displaceable contact pressure drum 19' avoids a need 
for a web throw-on device, which is needed in the winder of FIGS. 1 to 4. 
In the winder of FIGS. 5 and 6, the empty spool is accelerated to the 
running speed of the material web by the primary drive 33, which is 
preferably arranged in a fixed location on the transport device 5, and the 
spool is driven by the drive 33 for a specific time, even after the spool 
change. Only after the wound spool has been transferred into the secondary 
bearing is the secondary drive 32 activated and the primary drive 33 
detached. 
The empty spool 43 can be lowered from the ready position down to the 
winding level and be accelerated to the web speed only at the ready 
position. As a result, only two drives, which are preferably center 
drives, are needed for the spool, in order to apply a drive and/or braking 
torque to the spool during the entire winding process. Since the center 
drive for the empty spool need not be moved vertically but is moved only 
horizontally, in a preferred embodiment, only one of the two center drives 
is assigned to a spool during the entire winding process, which improves 
the winding quality. Therefore, the primary drive 33 and the secondary 
drive 32 must be displaceable horizontally, independently of each other 
and of the transport device 5. 
The vertical mobility of the contact pressure drum 19' makes it also 
possible to dispense with a hold-down device, known per se, which deflects 
the material web guided in a free draw. This enables the empty spool to be 
moved into the primary bearing without first having to be accelerated to 
web running speed. 
FIG. 6 shows that the secondary bearing 27 includes a reel support 78, 
which supports the outside of the wound reel held by the secondary bearing 
27 over a circumferential region, and relieves the bearing of load, so 
that the wound reel does not sag or its sag is only slight. The reel 
support 78 is arranged underneath the secondary bearing 27 and may for 
example, have two turn rolls and at least one circulating belt that is 
guided over them. The structure of the reel support 78 is a matter of 
choice and other designs of the reel support are possible. Supporting the 
wound reel while it is located in the final winding position improves the 
winding quality. 
Common to all of the embodiments of FIGS. 1 to 6 is that the pinch roll 41 
can be pressed against the circumference of the wound reel guided by the 
secondary bearing not only during a spool change, but also during the 
entire time in which the spool and, respectively, the wound reel wound 
thereon, is guided and held by the secondary bearing. Winding quality can 
be thereby improved. 
In a preferred embodiment, the contact pressure drum 19 has measuring 
sensors 67 for the bearing forces at its bearing points. The contact 
pressure, with which the contact pressure drum 19 is pressed against the 
circumference of an empty spool 29 or 43 and subsequently against the 
wound reel 31 or 47 wound thereon, is controlled as a function of the 
measured signals from the measuring sensors by a control or regulating 
device 68. 
Because the primary bearing is in a fixed location on the transport device, 
the structure of the winder can be simplified with respect to the known 
winders. In addition, the winder can be reliably controlled/regulated with 
a relatively low cost outlay. 
Although the present invention has been described in relation to particular 
embodiments thereof, many other variations and modifications and other 
uses will become apparent to those skilled in the art. It is preferred, 
therefore, that the present invention be limited not by the specific 
disclosure herein, but only by the appended claims.