U.S. patent application number 14/409573 was filed with the patent office on 2015-07-30 for winder for winding a band of fabric or knitting or the like on a roller, particularly for circular knitting machines.
This patent application is currently assigned to SANTONI S.P.A.. The applicant listed for this patent is Andrea LONATI, Ettore LONATI, Fausto LONATI, SANTONI S.P.A.. Invention is credited to Ettore Lonati, Fausto Lonati, Tiberio Lonati.
Application Number | 20150211156 14/409573 |
Document ID | / |
Family ID | 46582947 |
Filed Date | 2015-07-30 |
United States Patent
Application |
20150211156 |
Kind Code |
A1 |
Lonati; Ettore ; et
al. |
July 30, 2015 |
WINDER FOR WINDING A BAND OF FABRIC OR KNITTING OR THE LIKE ON A
ROLLER, PARTICULARLY FOR CIRCULAR KNITTING MACHINES
Abstract
A winder for winding a band of fabric or knitting or the like on
a roller, particularly for circular knitting machines, comprising a
frame which supports a takeup roller and a traction roller, which
is supported by the frame and can be actuated with a rotary motion
about its own axis with respect to the frame, the traction roller
making contact with the takeup roller, with the interposition of
the band wound around the takeup roller, the traction roller being
arranged so that its axis is above the axis of the takeup roller
and can move toward or away from the axis of the takeup roller as
the winding diameter of the band on the takeup roller varies, the
winder comprising elements for the actuation of the traction roller
with a rotary motion about its own axis with a substantially
constant actuation torque.
Inventors: |
Lonati; Ettore; (Botticino,
IT) ; Lonati; Fausto; (Brescia, IT) ; Lonati;
Tiberio; (Brescia, IT) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
LONATI; Andrea
LONATI; Ettore
LONATI; Fausto
SANTONI S.P.A. |
Brescia
Brescia |
|
IT
US
US
IT |
|
|
Assignee: |
SANTONI S.P.A.
Brescia
IT
|
Family ID: |
46582947 |
Appl. No.: |
14/409573 |
Filed: |
June 7, 2013 |
PCT Filed: |
June 7, 2013 |
PCT NO: |
PCT/EP2013/061802 |
371 Date: |
December 19, 2014 |
Current U.S.
Class: |
66/151 |
Current CPC
Class: |
D04B 15/88 20130101 |
International
Class: |
D04B 15/88 20060101
D04B015/88 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 21, 2012 |
IT |
MI2012A001090 |
Claims
1-11. (canceled)
12. A winder for winding a band of fabric or knitting or the like
on a roller, particularly for circular knitting machines,
comprising a frame which supports, so that it can rotate about its
own horizontally arranged axis, a takeup roller, on which the band
of fabric or knitting or the like is to be wound, and at least one
traction roller, which is supported, so that it can rotate about
its own axis, which is arranged in parallel to the axis of said
takeup roller, by said frame and can be actuated with a rotary
motion about its own axis with respect to said frame; said traction
roller making contact with said takeup roller, with the
interposition of said band wound around said takeup roller, for a
transmission of the rotation of said traction roller to said takeup
roller, wherein said traction roller is arranged so that its axis
is above the axis of said takeup roller and can move toward or away
from the axis of said takeup roller as the winding diameter of said
band on said takeup roller varies, means being provided for the
actuation of said traction roller with a rotary motion about its
own axis with a substantially constant actuation torque.
13. The device according to claim 12, wherein said actuation means
comprise a rack, which is supported, so that it can slide, by said
frame along a direction which is perpendicular to the axis of said
traction roller, said rack meshing with a pinion connected to said
traction roller by means of a unidirectional motion transmission
device adapted to render said pinion integral with said traction
roller in rotation about its own axis in a forward rotation
direction which actuates a rotation of said takeup roller in the
direction of the winding of said band on said takeup roller and to
uncouple said pinion from said traction roller in a return
direction of rotation which is opposite to said forward rotation
direction, said rack being actuated with a translational motion
along its own axis, at least in the direction of translation that
causes said forward rotation direction of said pinion, with a
substantially constant force.
14. The device according to claim 12, wherein said actuation means
comprise a rack which meshes with a pinion, which is connected to
said traction roller by means of a corresponding unidirectional
motion transmission device for each one of the axial ends of said
traction roller.
15. The device according to claim 14, wherein said unidirectional
motion transmission device is a device of the freewheel type.
16. The device according to claim 14, wherein said pinion is fitted
coaxially on an axial end of said traction roller, said
unidirectional motion transmission device being interposed between
said traction roller and said pinion.
17. The device according to claim 12, wherein the axis of said
traction roller and the axis of said takeup roller lie on a same
vertical plane.
18. The device according to claim 12, wherein axial ends of said
traction roller are accommodated slidingly within vertical guides
which are integral with said frame.
19. The device according to claim 14, wherein said rack is actuated
with a translational motion along its own axis, in the direction of
translation that causes said forward rotation direction of said
pinion, by means of a spring which is reloaded cyclically by a
fluid-operated cylinder.
20. The device according to claim 14, wherein said rack is actuated
with a translational motion along its own axis, in the direction of
translation that causes said forward rotation direction of said
pinion, by means of a pneumatic spring which is embedded in a
fluid-operated cylinder which can be actuated cyclically in order
to reload said pneumatic spring.
21. The device according to claim 14, wherein said rack is actuated
with an alternating translational motion along its own axis by
means of a double-acting fluid-operated cylinder.
22. The device according to claim 19, further comprising means for
adjusting an actuation force of said rack at least in the direction
of translation that causes said forward rotation direction of said
pinion.
Description
[0001] The present invention relates to a winder for winding a band
of fabric or knitting or the like on a roller, particularly for
circular knitting machines.
[0002] As is known, circular knitting machines are provided
generally with a knitting tensioning device that is arranged below
the needle cylinder of the machine and applies to the manufacture
being formed a downward traction that is needed in order to ensure
the correct forming of the manufacture.
[0003] These tensioning devices generally comprise a pair of
rollers with mutually parallel and horizontal axes, between which
the manufacture, constituted by a flattened tubular body, is caused
to pass, and one of these two rollers is motorized so as to apply,
in cooperation with the other roller, a traction to the
manufacture.
[0004] Laterally to the motorized roller, on the side opposite to
the roller that cooperates with it in applying traction to the
knitted manufacture, generally there is another roller, which has
the function of increasing the winding angle of the manufacture
onto the motorized roller and of guiding the manufacture toward a
takeup roller that is arranged below the tensioning device.
[0005] The takeup roller is part of a winding device that is
arranged below the tensioning device and comprises generally a
frame that supports, so that it can rotate about its own
horizontally arranged axis, the takeup roller onto which the
manufacture is to be wound.
[0006] In some winders the takeup roller is motorized, while in
other winders the takeup roller is supported by the frame so that
it can rotate about its own axis and is actuated by contact by
means of at least one traction roller, which also is supported by
the same frame so that it can rotate about its own axis, which is
arranged parallel to the takeup roller axis. The traction roller
can be actuated with a rotary motion about its own axis with
respect to the frame and the takeup roller rests, with the
interposition of the manufacture that winds about it, against the
traction roller so that the rotary motion of the traction roller is
transmitted by contact to the takeup roller, causing the
progressive winding of the manufacture thereon.
[0007] For obtaining a uniform winding of the manufacture around
the takeup roller without the manufacture undergoing unwanted
deformations, the force with which the manufacture is tensioned
during winding around the takeup roller must remain constant. To
meet this requirement, two methods are usually used: a first
method, which we will term "constant-speed operation", and a second
method, which we will term "constant-torque operation".
[0008] In winders that use a traction roller, to which the present
invention relates, constant-speed operation consists in setting a
preset transmission ratio between the motorized roller of the
tensioning device and the traction roller of the winder. By means
of this method, each variation of the speed of the motorized roller
of the tensioning device corresponds to an identical variation of
the speed of the traction roller and therefore there are no changes
in the tensioning force of the manufacture during its winding. The
preset transmission ratio between the motorized roller of the
tensioning device and the traction roller of the winder can be
obtained by means of a mechanical transmission or by using
variable-speed electric motors which can be controlled in a
correlated manner.
[0009] In constant-torque operation, the takeup roller is actuated
with a rotary motion about its own axis with a torque that can vary
and with a rotation rate that can undergo variations as a function
of the type of knitting that is manufactured and of the diameter of
the roll of knitting being wound around the takeup roller so as to
obtain in any case, at least in theory, a constant tensioning force
of the manufacture during its winding.
[0010] Winding devices based on constant-torque operation are
described for example in WO2011/042298 in the name of this same
Applicant, which provides for limiting the actuation torque
transmitted by the traction roller to the takeup roller, or in
Italian patent 1,293,791 in the name of this same Applicant, which
provides for actuating the takeup roller with a torque-controlled
electric motor that is feedback-controlled by means of a transducer
system capable of measuring the tension of the knitting at the
input of the takeup roller.
[0011] Winders based on torque-controlled operation are preferred
to winders based on speed-controlled operation in machines that
perform knittings with variations of the type or quantity of
knitting produced, such as for example in machines with electronic
selection, with particular reference to those that transfer
knitting from needles to continuous needles.
[0012] Among winders based on torque-controlled operation, winders
that use a traction roller to actuate the takeup roller are the
easiest to provide and manage.
[0013] In winders that use a traction roller to actuate the takeup
roller and that are based on torque-controlled operation, the
traction roller is arranged below the takeup roller, which rests
thereon with the interposition of the manufacture, which winds
progressively about the takeup roller. An arrangement of this kind
is illustrated in the above-cited patent application
WO2011/042298.
[0014] These winders have the drawback of being affected by the
weight of the roll of the band of fabric that is wound
progressively about the takeup roller. The total weight of the
takeup roller and of the manufacture that winds about it increases
progressively, varying the degree of adhesion of the takeup roller
to the traction roller and the resistance opposed by the takeup
roller to the rotary motion transmitted by the traction roller to
the takeup roller. These variations can cause variations of the
tensioning force of the manufacture during its winding around the
takeup roller and therefore can alter the uniformity of the winding
of the manufacture around the takeup roller.
[0015] The aim of the present invention is to obviate the drawback
cited above, providing a winder for winding a band of fabric or
knitting or the like around a roller, particularly for circular
knitting machines, with a constant-torque operation that maintains
a substantially constant tension of the band of fabric or knitting
during its winding around the takeup roller so as to obtain a
uniform winding, without deformations, of the strip of fabric or
knitting or the like.
[0016] Within this aim, an object of the invention is to provide a
winder in which the winding tension of the band of fabric or
knitting or the like is not affected by the amount of knitting or
fabric that is wound around the takeup roller.
[0017] Another object of the invention is to provide a winder in
which it is possible to vary the tension to which the band of
fabric or knitting or the like is subjected during winding around
the takeup roller.
[0018] An additional object of the invention is to provide a winder
that ensures high precision and reliability in operation.
[0019] Another object of the invention is to propose a device that
can be manufactured at competitive costs and is easy to manage.
[0020] This aim, as well as these and other objects that will
become more apparent hereinafter, are achieved by a winder for
winding a band of fabric or knitting or the like around a roller,
particularly for circular knitting machines, comprising a frame
which supports, so that it can rotate about its own horizontally
arranged axis, a takeup roller, around which the band of fabric or
knitting or the like is to be wound, and at least one traction
roller, which is supported so that it can rotate about its own
axis, which is arranged parallel to the axis of said takeup roller,
by said frame and can be actuated with a rotary motion about its
own axis with respect to said frame; said traction roller making
contact with said takeup roller, with the interposition of said
band wound around said takeup roller, for a transmission of the
rotation of said traction roller to said takeup roller,
characterized in that said traction roller is arranged so that its
axis is above the axis of said takeup roller and can move toward or
away from the axis of said takeup roller as the winding diameter of
said band on said takeup roller varies, means being provided for
the actuation of said traction roller with a rotary motion about
its own axis with a substantially constant actuation torque.
[0021] Further characteristics and advantages of the invention will
become more apparent from the description of a preferred but not
exclusive embodiment of the winder according to the invention,
illustrated by way of non-limiting example in the accompanying
drawings, wherein:
[0022] FIG. 1 is a partially exploded perspective view of the
winder according to the invention;
[0023] FIG. 2 is a perspective view of the winder according to the
invention, with the strip of fabric or knitting or the like to be
wound omitted;
[0024] FIG. 3 is a perspective view of the winder according to the
invention, from a different angle than in FIG. 2;
[0025] FIG. 4 is a schematic view of the winder according to the
invention, illustrating its operation.
[0026] With reference to the cited figures, the winder according to
the invention, generally designated by the reference numeral 1,
comprises a frame 2 that supports, so that it can rotate about its
own axis 3a, which is arranged horizontally, a takeup roller 3
about which the band 4 of fabric or knitting or the like is
intended to be wound. The winder 1 comprises a traction roller 5
that is supported, so that it can rotate about its own axis 5a,
which is arranged parallel to the axis 3a of the takeup roller 3,
by the frame 2 and can be actuated with a rotary motion about its
own axis 5a with respect to said frame 2. The traction roller 5
makes contact with the takeup roller 3, with the interposition of
the band 4 wound about the takeup roller 3, in order to transmit
the rotation of the traction roller 5 to the takeup roller 3.
[0027] According to the invention, the traction roller 5 is
arranged so that its axis 5a lies above the axis 3a of the takeup
roller 3 and can move toward or away from the axis 3a of the takeup
roller 3 as the winding diameter of the band 4 on the takeup roller
3 varies. The winder 1 according to the invention comprises means 6
for actuating the traction roller 5 with a rotary motion about its
own axis 5a with a substantially constant actuation torque.
[0028] More particularly, the frame 2 is composed of a lower
profiled element 7, which is arranged substantially horizontally
and from which two vertical shoulders 8a, 8b rise which are
mutually connected, at their upper end, by a horizontal bar 9. If
the winder according to the invention is intended to be fitted on a
circular knitting machine, the shoulders 8a, 8b can be provided in
an upward region with arms 10a, 10b so as to connect the frame 2
below the needle cylinder of the machine.
[0029] In the illustrated embodiment, the frame 2 supports, in
proximity to the upper end of the shoulders 8a, 8b, a tensioning
device 11 of a known type, for example a tensioning device of the
type described in WO2011/042298, which is composed of three
side-by-side rollers 12, 13, 14, respectively: a motorized central
roller 12, a contact roller 13 that is arranged on one side of the
central roller 12, and a guiding roller 14 that is arranged on the
other side of the central roller 12. The rollers 12, 13, 14 are
arranged so that their axes are horizontal and mutually parallel
and the band 4 to be wound about the takeup roller 3 passes between
the contact roller 13 and the central roller 12 to then pass
between the central roller 12 and the guiding roller 14 to reach
finally the takeup roller 3, which is supported by the frame 2 so
that its axis 3a is arranged in parallel to the axes of the rollers
of the tensioning device.
[0030] The takeup roller 3 is composed of a cylindrical jacket
about which the band 4 is to be wound and which is closed, at its
axial ends, by portions of a shaft or coaxial pivots that
constitute the axial ends of the takeup roller 3. These axial ends
of the takeup roller 3 are coupled, in a rotatable manner, with the
interposition of bearings 15, to the shoulders 8a, 8b of the frame
2.
[0031] The means 6 for actuating the traction roller 5 comprise a
rack 16a, 16b, which is supported, so that it can slide, by the
frame 2 along a direction that is perpendicular to the axis 5a of
the traction roller 5. The rack 16a, 16b meshes with a pinion 17a,
17b, which is connected to the traction roller 5 by means of a
unidirectional motion transmission device 18, which is adapted to
render the pinion 17a, 17b integral with the traction roller 5 in
rotation about its own axis 5a in a forward rotation direction,
which causes a rotation of the takeup roller 3 in the direction for
winding the band 4 about the takeup roller 3, and to uncouple the
pinion 17a, 17b from the traction roller 5 in a return rotation
direction that is opposite to the forward rotation direction. The
rack 16a, 16b is actuated with a translational motion along its
axis, at least in the direction of translation that produces the
forward rotation direction of the pinion 17a, 17b, with a
substantially constant force.
[0032] More particularly, the actuation means 6 of the traction
roller 5 comprise a rack 16a, 16b that meshes with a pinion 17a,
17b connected to the traction roller 5 by means of a corresponding
unidirectional motion transmission device 18 for each one of the
axial ends of the traction roller 5.
[0033] Conveniently, each one of the pinions 17a, 17b that meshes
with the corresponding rack 16a, 16b is fitted coaxially on one of
the axial ends of the traction roller 5 and the corresponding
unidirectional motion transmission device 18 is constituted
preferably by a freewheel device that is interposed between the
respective pinion 17a, 17b and the corresponding axial end of the
traction roller 5.
[0034] Preferably, the arrangement of the takeup roller 3 and of
the traction roller 5 on the frame 2 is such that the axis 3a of
the takeup roller 3 and the axis 5a of the traction roller 5 are
arranged on a same vertical plane so that the axis 5a of the
traction roller 5 is arranged above the axis 3a of the takeup
roller 3.
[0035] With this arrangement, which is the one shown, the racks
16a, 16b are arranged so that their axis is vertical and are
conveniently guided by the shoulders 8a, 8be along a corresponding
vertical direction.
[0036] The axial ends of the traction roller 5 are accommodated
slidingly within vertical guides 21a, 21b that are integral with
the frame 2.
[0037] More particularly, bearings 22a, 22b are fitted on the axial
ends of the traction roller 5, externally with respect to the
region occupied by the pinions 17a, 17b, each bearing engaging
slidingly within a corresponding vertical guide 21a, 21b that is
formed in the corresponding shoulder 8a, 8b of the frame 2. In this
manner, the traction roller 5 can slide vertically upward as the
amount of band 4 wound onto the takeup roller 3 increases.
[0038] Each one of the racks 16a, 16b is actuated with a
translational motion along its own axis, in the direction of
translation that causes the forward rotation direction of the
corresponding pinion 17a, 17b, by means of a spring 23a, 23b that
is reloaded cyclically by a fluid-operated cylinder 24a, 24b.
[0039] More particularly, for each one of the racks 16a, 16b there
is a pivot 25 that is integral with the rack 16a, 16b and is
connected to another pivot 26 fixed to a plate 27 that is integral
with the corresponding shoulder 8a, 8b of the frame 2 by means of
the spring 23a, 23b. It should be noted that along the longitudinal
extension of each rack 16a, 16b there are multiple holes 28 for
positioning the pivot 25 so as to make it possible to vary the
preloading of the spring 23a, 23b according to the requirements.
The spring 23a, 23b is arranged so as to contrast the movement of
the rack 16a, 16b upward, i.e., cause the movement of the rack 16a,
16b downward with respect to the frame 2. The fluid-operated
cylinder 24a, 24b is connected with its body to the corresponding
shoulder 8a, 8b of the frame 2 and operates with the stem of its
piston on an end of the corresponding rack 16a, 16b. Essentially,
the actuation of the fluid-operated cylinder 24a, 24b causes the
upward movement of the rack 16a, 16b and the loading of the spring
23a, 23b, whereas the discharge, i.e., the deactivation, of the
fluid-operated cylinder 24a, 24b causes the downward movement of
the rack 16a, 16b by the action of the spring 23a, 23b. The
downward movement of the rack 16a, 16b, as a consequence of the
coupling that exists between the rack 16a, 16b and the
corresponding pinion 17a, 17b, turns the pinion 17a, 17b in the
forward rotation direction, which causes the rotation of the
traction roller 5 and consequently, by contact, the rotation of the
takeup roller 3 in the winding direction 20, whereas the upward
movement of the rack 16a, 16b causes no rotation of the traction
roller 5, since the pinion 17a, 17b rotates in the return rotation
direction, which, as a consequence of the presence of the freewheel
device 18, transmits no rotation to the traction roller 5 and
therefore to the takeup roller 3.
[0040] Essentially, the force that generates the actuation torque
that is transmitted by the traction roller 5 to the takeup roller 3
is the force produced by the elastic reaction of the spring 23a,
23b that is loaded cyclically by the fluid-operated cylinder 24a,
24b. By limiting appropriately the stroke of the fluid-operated
cylinder 24a, 24b and consequently the elongation of the spring
23a, 23b during loading, the force generated by the spring 23a, 23b
and transmitted, by means of the coupling that exists between the
rack 16a, 16b and the pinion 17a, 17b and by means of the
unidirectional motion transmission device 18, to the traction
roller 5 is substantially constant and therefore generates a
substantially constant actuation torque of the traction roller
5.
[0041] Consequently, the force that is transmitted by the traction
roller 5 to the takeup roller 3 is also substantially constant,
thus achieving a substantially constant tensioning of the band 4
during its winding around the takeup roller 3. In practice, the
tension T to which the band 4 is subjected during its winding about
the takeup roller 3 is expressed by the formula (see FIG. 4):
T=F.sub.t=C.sub.t/R.sub.t=F.sub.mR.sub.p/R.sub.t
[0042] As explained above, by a reduction in the extent of the
movement of the rack 16a, 16b by means of the action of the
fluid-operated cylinder 24a, 24b, the tension T remains
substantially constant.
[0043] By means of the movement of the fixing point of the pivot 25
along the rack 16a, 16b it is possible to vary the preloading of
the spring 23a, 23b and consequently to vary the tension that bears
on the band 4 during winding around the takeup roller 3.
[0044] As an alternative, instead of a helical spring 23a, 23b, as
shown, it is possible to use a pneumatic spring that can be
included in the fluid-operated cylinder that can be actuated
cyclically in order to reload the pneumatic spring. In this case it
is possible to vary the winding tension of the band 4 by adjusting
the force generated by the pneumatic spring.
[0045] As a further alternative, each rack 16a, 16b can be actuated
with an alternating translational motion along its own axis by
means of a double-acting fluid-operated cylinder. In this case it
is possible to vary the winding tension of the band 4 by varying
the supply pressure of the double-acting fluid-operated
cylinder.
[0046] For the sake of completeness in description, it should be
noted that the frame 2 can also be supported by means of a lower
supporting element 29 that supports the frame 2 so that it can
rotate about a vertical central axis which, in the installation of
the device on the knitting machine, is arranged at the axis of the
needle cylinder in order to allow the frame 2 to rotate together
with the needle cylinder of the knitting machine.
[0047] Operation of the device according to the invention is as
follows.
[0048] At the beginning of the winding of the band 4 around the
takeup roller 3, the traction roller 5 is proximate to the lower
end of the vertical guides 21a, 21b, as shown in FIGS. 2 and 3. The
band 4 of fabric or knitting or the like, which arrives from the
tensioning device 11, is wound with an initial portion around the
takeup roller 3 and the actuation of the traction roller 5 with a
rotary motion about its own axis 5a produces by contact the
rotation of the takeup roller 3 about its own axis 3a and therefore
the progressive winding of the band 4 that originates from the
tensioning device 11 about it. As explained above, the traction
roller 5 is actuated by means of the alternating movement of the
racks 16a, 16b along their own axis, i.e., in the illustrated
embodiment, along a vertical direction. This alternating
translational motion, during the rising motion, has no effect on
the rotation of the traction roller 5, whereas during the
descending motion it causes the rotation of the traction roller 5
integrally with the pinions 17a, 17b that mesh with the
corresponding rack 16a, 16b and consequently causes by contact the
rotation of the takeup roller 3 in the winding direction 20. Due to
the fact that the force that causes the downward movement of the
rack 16a, 16b is substantially constant, the force transmitted by
the traction roller 5 to the takeup roller 3 is substantially
constant and consequently the tensioning of the band 4 during its
winding about the takeup roller 3 is substantially constant. As a
consequence of the progressive winding of the band 4 about the
takeup roller 3, the diameter of the assembly constituted by the
takeup roller 3 and by the band 4 wound around it increases
progressively, with consequent rise of the traction roller 5 with
its axial ends along the vertical guides 21a, 21b.
[0049] It should be noted that in the device according to the
invention the takeup roller 3 does not rest on the traction roller
5 and therefore its progressive increase in diameter and weight as
the winding of the band 4 progresses does not cause substantial
variations of the force that is transmitted by the traction roller
5 to the takeup roller 3 and consequently of the tensioning of the
band 4, which therefore remains substantially constant during
winding.
[0050] To avoid a rotation of the takeup roller 3 in the direction
opposite to the winding direction 20 in the step for loading the
spring 23a, 23b, it is possible to interpose unidirectional
rotation devices, such as for example freewheel devices, also
between the axial ends of the takeup roller 3 and the shoulders 8a,
8b that support them.
[0051] In practice it has been found that the device according to
the invention achieves fully the intended aim, since it ensures a
substantially constant tensioning of the band of fabric or knitting
or the like during its winding about the takeup roller, allowing
uniform winding even with reduced tensions.
[0052] A further advantage of the device according to the invention
is that it can be actuated in a very simple manner and allows
precise adjustment of the tension to which the band of fabric or
knitting or the like is subjected during winding.
[0053] The device thus conceived is susceptible of numerous
modifications and variations, all of which are within the scope of
the inventive concept; thus, for example, instead of providing two
racks 16a, 16b it is possible to provide a single rack.
[0054] All the details may further be replaced with other
technically equivalent elements.
[0055] In practice, the materials used, as well as the dimensions,
may be any according to the requirements and the state of the
art.
[0056] The disclosures in Italian Patent Application No.
MI2012A001090 from which this application claims priority are
incorporated herein by reference.
* * * * *