WO2006085350A1

WO2006085350A1 - Device for distributing and winding a yarn on a reel

Info

Publication number: WO2006085350A1
Application number: PCT/IT2006/000066
Authority: WO
Inventors: Bruno Pini; Alfio Vezil
Original assignee: Celbo S.R.L.
Priority date: 2005-02-14
Filing date: 2006-02-09
Publication date: 2006-08-17
Also published as: ITFI20050023A1

Abstract

The device includes a thread guide (11) provided with a reciprocating movement and supported by a first end of a rod (17) oscillating in a plane of oscillation. The second end of said rod is constrained to an axis of oscillation (A) orthogonal to said rod. In an intermediate area between the first end and the second end the rod (17) is constrained to a control member (41) rotating about an axis of rotation (C), substantially parallel to said axis of oscillation (A) to which the second end of the rod is constrained.

Description

"DEVICE FOR DISTRIBUTING AND WINDING A YARN ON A REEL"

DESCRIPTION Technical Field ,

The present invention relates to a traversing device, i.e. a device that imparts a reciprocating transverse movement to a thread or yarn fed substantially continuously to wind said thread or yarn on a tube and form a reel or spool.

More specifically, the present invention relates to mechanisms to impart reciprocating motion to the thread guide of the device. State of the art Various types of traversing mechanisms or devices already exist to distribute and wind a yarn fed continuously around a tube and form a reel or spool. In general, a device for distributing a yarn to be wound on a reel includes a thread guide provided with reciprocating movement, according to a straight line or an arc of circumference, to distribute the yarn according to helical turns with variable inclination about a collecting tube. Movement of the thread guide can be imparted, for example, by a profile of a cam with helical groove produced in a rotating cylindrical member. An example of a yarn distributing device of this type is described in US-A-4,114,821.

US-A-5,082,193 describes a device for distributing a yarn on a reel, in which the thread guide is mounted at the end of a rod provided with a reciprocating rectilinear movement, imparted by an elastic wheel that acts on the rod of the thread guide. The thread guide rests on two abutment and guiding rollers placed opposite the elastic wheel,

In other known devices the thread guide is mounted on a belt operated with a suitably controlled reciprocating motion. An example of a winding device of this type is described in US-A-5,370,325.

US-A-4,881,694 illustrates and describes a further winding device in which the thread guide is . again supported by a belt provided with a reciprocating movement. Means are provided to recover kinetic energy during the reversing motion of the thread guide.

US-A-5, 516,057 describes a mechanism for adjusting the stroke of the thread guide in a winding device, to obtain a particular profile of the truncated cone shaped end of the reel being formed. The thread guide is provided with reciprocating motion by a system analogous to the one described previously, while the stroke of the thread guide is modified by a system of cams.

US-A-6,592,066 describes a winding device of a yarn with a thread guide provided with an oscillatory movement. The thread guide is permanently connected to a potential energy accumulator, which is used to make the oscillatory movement of the thread guide more even and harmonious. Objects and summary of the invention

The object of the present invention is to produce a new device for distributing a yarn to be wound on reels, which is particularly efficient, easily adjustable, fast and sturdy. Within the scope of this general object, the object of a preferred embodiment of the invention is to obtain a traversing device which allows efficacious uneven winding of the turns of yarn on the reel to be obtained in order to avoid precise superimposing of the various turns during winding, to facilitate subsequent easy unwinding of the yarn from the reel or spool when this is utilized, for example, to feed the yarn to a knitting machine.

In substance, the invention provides for a device for distributing a yarn to be wound on a reel, comprising a thread guide provided with a reciprocating movement and an actuator to control movement of the thread guide, wherein: the thread guide is associated with a first end of an oscillating rod, the second end of which is constrained to an axis of oscillation orthogonal to said rod. Moreover, in an intermediate area between the two ends, the rod is constrained to a control member operated by an actuator and rotating about an axis of rotation, substantially parallel to the axis of oscillation to which the second end of the rod is constrained. In substance, the rod with the thread guide and the control member form a link mechanism.

In order to obtain uneven winding of the yarn on the reel, the position of the axis of oscillation to which the rod is constrained can be variable in time during the winding cycle of the reel. The law of variation can be random, and the speed of the variations is high with respect to the winding speed, to obtain the desired uneven effect.

In practice, according to an advantageous embodiment of the invention, the oscillation axis to which the rod is constrained can be variable to modify in time the distance between said oscillation axis and the rotation axis about which the control member rotates. In addition to obtaining said unevenness, the distance between said two axes can be modified in time with a law determined in order to obtain a particular conformation, i.e. with a double frustum-cone shaped taper, of the reel or spool being formed. In fact, by varying the distance between these two axes in a manner that is gradual and synchronized with rotation of the rotating control member and, consequently, as a function of the time or of the length of yarn wound on the reel, the stroke of the thread guide can be reduced gradually and symmetrically.

This particular function, which can be obtained with an electronically controlled electric motor coordinated with an electric motor which controls the rotating member constrained to the rod, it can also be implemented in the absence of the function for uneven winding, as these two functions are normally implemented by two separate actuators. In general, therefore, the distance between the axis of oscillation constrained to the oscillating rod and the axis of rotation of the control member can vary to create uneven winding, to suitably shape the reel or to obtain both functions, with different criteria, laws and speeds of variation for the two functions.

Constraint between the rotating control member and the oscillating rod can be obtained by an intermediate guide inside which the rod is guided so that it can slide in a direction parallel to its longitudinal extension. The guide can be constrained to the rotating control member so as to oscillate about an axis integral with said member and parallel to the axis of rotation of the rotating control member and to the axis of oscillation to which the rod is constrained.

In a modified embodiment, the intermediate guide that constrains the rod to the rotating control member is supported so that it can oscillate about an axis integral with a movable slide with reciprocating rectilinear motion, in a direction substantially orthogonal to the plane on which the axis of oscillation and the axis of rotation of the rotating control member lie. The reciprocating movement of the slide is controlled by the rotating control member through a suitable coupling, for example with a pin integral with the rotating member inserted in a slot of the slide.

Further advantageous features and embodiments of the device according to the invention are indicated in the appended claims and will be described in greater detail hereunder with reference to non-limiting examples of embodiment of the invention. Brief description of the drawings

The invention will be better understood- following the description of the non- limiting accompanying drawing, which shows practical embodiments of the invention. More specifically: Figures 1 and 2 show front views according to l-l in Figure 3 in two different positions of the oscillating rod;

Figure 3 shows a view according to Ill-Ill in Figures 1 and 2;

Figure 4 shows a section according to IV-IV in Figure 1 ;

Figure 5 shows a section according to V-V in Figure 1; Figures 6 and 7 show two front views analogous to the views in Figures 1 and 2 of two further embodiments of the device according to the invention; and

Figures 8 and 9 show a front view and a section according to IX-XI in Figure 8 of a further embodiment of the invention. Detailed description of the preferred embodiments of the invention With initial reference to Figures 1 to 5, in a first embodiment the traversing device, indicated as a whole with 1, includes a supporting plate 3 supported on which, by means of side brackets 5, is an idle roller 7, to which a yarn F (indicated in Figure 5) is fed from a feed area (not shown), such as a texturizing machine, a winding frame, a spooler, a stretch-winder, a winder or the like. The yam F is fed on a bow 9 and guided in a thread guide 11 provided with reciprocating motion to distribute the yarn according to turns around a reel, indicated schematically with R in Figure 5, which forms around a tube made to rotate by rotation means, known per se and not shown.

In this example of embodiment, the thread guide 11 is constrained to a slide 13 sliding on guides 15 constrained to the plate 3. The reciprocating rectilinear movement according to the double arrow f11 of the thread guide 11 (Figures 1 and

2) is imparted by an oscillating rod 17. A first end of the oscillating rod 17, indicated with 17A, is hinged to the slide 13 supporting the thread guide 11, while the opposite end 17B is engaged in a bushing 19 oscillating about an axis of oscillation A, orthogonal to the plate 3.

The bushing 19 is supported, by a pin integral therewith, in a bearing 21 to allow it to rotate idle about the axis A. The bearing 21 is supported by a slide 23 sliding along guides 25 according to the double arrow f23. The guides 25 are integral with a support 24 which, in this example of embodiment, is clamped on the plate 3 by screws 26 which engage in slots 28 of the support 24. This arrangement allows, adjustment of the .distance between the axis A of oscillation of the rod with- respect to the trajectory of the thread guide 11.

Therefore, the slide 23 is provided with a movement towards and away from the trajectory of the slide 13 supporting the thread guide. Consequently, due to sliding of the slide 23, the axis of oscillation A has a variable distance with respect to the trajectory of the thread guide 11.

Movement of the slide 23 is controlled by an actuator 27, typically an electronically controlled electric motor, through a pin 29 integral with a pulley 31 made to rotate by the motor 27 and eccentric with respect to the axis of rotation of said pulley. The pin 29, with interposition of a bearing, is inserted in a slot 33 of the slide 23.

The slot 33 extends longitudinally orthogonal to the guides 25, so that rotation of the pulley 31 is transformed into a reciprocating rectilinear movement according to f23 of the slide 23. The motor 27 can be controlled with the desired law of motion, not necessarily in continuous rotation, for the purposes to be explained hereunder.

In an intermediate area between the ends 17A, 17B of its longitudinal extension, the rod 17 is guided inside an intermediate guide 35 equipped with sliding bearings or bearing brasses 37. The guide 35 is supported oscillatingly about an axis B supported by a rotating control member indicated as a whole with

39 and comprising a pulley 41. The pulley 41 is made to rotate by an electric motor

43, about a rotation axis C parallel to the axes A and B, the axis B being eccentric with respect to the rotation axis C. The pulley 41 is equipped with a counterweight 41 A to balance the guide 35.

Operation of the device described above is as follows. With the electric motor 27 stopped and therefore keeping the slide 23 and the axis A in a fixed position with respect to the plate 3, rotation according to f41 of the pulley 41 controlled by the motor 43 determines an oscillatory movement of the rod 17 about the axis A and a consequent reciprocating translational movement of the thread guide 11 according to the arrow f11. As the slide 13 on which the thread guide 11 is mounted is obliged to follow a rectilinear trajectory parallel to the guides 15, during oscillation the rod 17 slides (parallel to its longitudinal extension) inside the guide 35 and the bushing 19. Its movement is therefore a combined rotational and translational movement, as the axis A is the instantaneous axis of oscillation of said rod.

If a rotation of the motor 27 is added to this movement, this causes a variation, with law determined by the motion of said motor 27, of the instantaneous position of the axis A which translates according to the arrow fA in a direction orthogonal to the axes A and C and to the guides 15. This causes an alteration, controllable through a suitable law of motion of the motor 27, of the trajectory of the thread guide 11. Movement of the motor 27 and therefore of the axis A of instantaneous oscillation of the rod 17 consequently causes a variation of the form of the turns of yarn placed around the reel R, and therefore, in substance, uneven winding of the yarn. .

Figure 6 shows a variant of embodiment. The same numbers indicate parts, which are the same as or correspond to those in the example of embodiment in Figures 1 to 5. In this example, the thread guide 11 is constrained rigidly to the end 17A of the oscillating rod 17, which therefore does not slide inside the guide 19, but remains fixed with respect thereto, being engaged with the end 17B. The trajectory of the thread guide 11 is a trajectory along an arc of circumference AC, instead of a rectilinear trajectory. The arrow f11 again indicates the movement of the thread guide 11 , which in this case is a reciprocating oscillatory movement.

Oscillation of the rod 17 is controlled again by rotation of the pulley 41 constrained to the rod 17 by the guide 35 oscillating about the axis B, parallel to the axis C of rotation of the pulley. When the motor 27 is stopped, the axis A of oscillation . of the rod is fixed and the rod moves in this case with a simple oscillatory movement. No uneven winding of the yarn on the reel R is produced. Instead, when the motor 27 is made to rotate with the desired law, the slide 23 to which the axis A of oscillation of the rod 17 is constrained moves according to the arrow f23 with the law of motion established by the movement of the motor 27. The variation in time (during winding) of the distance between the axis A and the axis C determines, as in the previous case, a variation in the law of winding of the yarn and therefore consequent uneven winding of the wound yarn.

Figure 7 shows a further embodiment of the device. The same or equivalent parts are indicated with the same reference numbers used in the previous examples of embodiment. In this case the thread guide 11 is provided with a reciprocating rectilinear motion along the guides 15 analogous to the illustration in the example in. Figures 1 to 5. The lower end 17B of the oscillating rod -17 is constrained slidingly in the bushing 19 and the axis of oscillation A of said bushing 19 is supported by a slide 23 sliding according to the arrow f23 along the guides 25 through the action of a motor 27 as described above.

Unlike the example in Figures 1 to 5, in this case the intermediate guide 35, oscillating about the axis B and inside which the rod 17 engages slidingly, is not constrained directly to the pulley 41 , but to a carriage or slide 51 guided along guides 53 parallel to the guides 15 of the slide 13 supporting the thread guide 11. The oscillatory movement is imparted in this case to the rod 17 again by the pulley 41 , not directly, but through a mechanism to transform the rotational motion of the pulley 41 into a reciprocating rectilinear motion of the slide 51.

For this purpose, the slide 51 is provided with a slot 57 orthogonal to the guides 53, inside which a pin, integral with the pulley 41 and eccentric with respect to the axis C of rotation of said pulley, engages. The mechanism, analogous to the one producing reciprocating translation of the axis A, formed by the slot 57 and by the pin engaged therein, rotating integrally with the pulley 41 , transforms the rotational motion of the motor 43 into the reciprocating motion according to the arrow f51 of the slide 51. The constraint between the slide 51 and the rod 17, obtained by the sliding guide 35, transmits the reciprocating motion of the slide 51 to the rod 17 which is consequently provided with an oscillatory movement about the axis A, as well as with a sliding movement inside the bushing 19 and inside the guide 35, said sliding being established by the reciprocal constraint between the rod 17 and the slide 13 which is obliged to translate along a rectilinear trajectory. The controlled movement of the slide 23 supporting the axis A, obtained also in this case with the motor 27 (shown in Figures 1 to 5), produces a variation in time of the position of the axis A with respect to the axis C and therefore a variation of the law of winding of the yarn F on the reel R, consequently creating uneven winding. . Figures 8 and 9 show a variant of embodiment with respect to Figures 1 to

5. The same numbers indicate parts the same as or equivalent to those in Figure 1 to 5. In this configuration, the guides 25 along which the slide 23 supporting the axis A of oscillation of the bushing 19 slide, are integral with a support 24, to which the motor 27 is also constrained. The support 24 has slots 28 greater in length than the slots of the analogous support 24 of the previously described embodiment and screws 26 engage in these slots; said screws are not fully tightened, but allow the support 24 to slide with respect to the plate 3 for the purposes described below. The support 24 is longer compared to the one in the previous embodiments and a rack 61 is applied to the downward facing elongated portion 24A of said support. The rack 61 meshes with a pinion 63 made to rotate by a motor 65 integral with the plate 3. The reciprocating rotational movement of the motor 65 causes, in this way, a reciprocating translation of the support 24 according to the arrow f24. The reciprocating movement according to f24 of the support 24 causes a corresponding reciprocating translational motion of the axis A of oscillation with consequent variation of the distance between the axes A and C. The rod 17, with respect to the embodiment in Figures 1 to 5, is longer to allow an increase in the distance between the axes A and C due to the movement according to f24 of the support 24.

The reciprocating rectilinear movement according to f24 of the support 24 controlled by the electronically controlled motor 64, can be synchronized with the linear movement of the slide 13, and consequently of the thread guide, controlled by the principal motor 43 which makes the pulley 41 rotate. In this way during collection of the yarn F on the reel R the axis A of oscillation of the rod 17 can be moved progressively and automatically away from the axis C. Consequently, the stroke of the slide 13 and of the thread guide 11 decreases progressively, to produce a symmetrical tapering on both sides of the reel or spool, which becomes truncated cone shaped. The suitably controlled motor 65 is used, in this case, to give the reel or spool of yarn a suitable shape.

Conversely, the motor 65 can also be used exclusively to adjust the distance between the axes A and C automatically instead of manually (by loosening the screws 26, as can be done in the embodiment in the previous figures) each time the device is adjusted to obtain a specifically shaped reel of yam, nevertheless keeping this distance constant during the winding cycle.

The movement obtained with the motor 65 does not replace the movement established by the motor 27. In fact, the latter imparts a movement of uneven winding at high frequency to prevent repetitive overlapping of the turns of yarn on the reel or spool B, to facilitate subsequent unwinding. Conversely, the motor 65 is used to cause a slow and gradual variation. of the distance between the axes A, and C and therefore of the overall shape of the reel by shortening the trajectory of the thread guide. It is understood that the drawing only shows a simplification provided purely as a practical demonstration of the invention, which may vary in forms and arrangements without however departing from the scope of the concept on which said invention is based. Any reference numerals in the appended claims are provided purely to facilitate reading of the claims with reference to the description and to the drawing, and do not limit the scope of protection represented by the claims.

Claims

1 A. device, far distributing , a -yarn (F) . to be, wound on . a reel (R), comprising a thread guide (11) provided with a reciprocating movement and supported by a first end of a rod (17) oscillating in a plane of oscillation, the second end of said rod being constrained to ah axis of oscillation (A) orthogonal to the rod, characterized in that in an intermediate area between the first end and the second end said rod is constrained to a control member (41) rotating about an axis of rotation (C), substantially parallel to said axis of oscillation (A) to which the second end of the rod is constrained.

2. Device as claimed in claim 1, characterized in that the position of the axis of oscillation (A) is variable in time during movement of said thread guide.

3. Device as claimed in claim 2, characterized in that the position of the axis of oscillation constrained to the rod is variable in time to vary the distance between said axis of oscillation (A) and the axis of rotation (B) of the rotating control member (41).

4. Device as claimed in claim 3, characterized in that said position of the axis of oscillation (A) constrained to the rod (17) is variable with a variation speed that is higher than the winding speed, to create uneven winding of the turns.

5. Device as claimed in claim 3 or 4, characterized in that said position of the axis of oscillation (A) constrained to the rod (17) is movable gradually in time synchronized with winding, to shape the ends of the reel or spool being formed.

6. Device as claimed in one or more of the previous claims, characterized in that said rod (17) is constrained to said rotating control member (41) by an intermediate guide (35) inside which said rod is guided slidingly in a direction parallel to its longitudinal extension.

7. Device as claimed in claim 6, characterized in that said intermediate guide (35) is supported, on said rotating control member (41), oscillatingly. about an axis (B) integral with the rotating control member (41) and parallel to the axis of rotation (C) of said rotating control member.

8. Device as claimed in claim 6, characterized in that said intermediate guide (35) is supported oscillatingly about an axis (B) integral with a slide (51) movable with reciprocating motion in a direction (f51) substantially orthogonal to the plane on which the axis of oscillation (A) constrained to the second end of the rod (17) and the axis of rotation (B) of the rotating control member (41) lie, the reciprocating movement of said slide being controlled by said rotating control member

9. Device as claimed in claim 8, characterized in that said slide is constrained to said rotating control member by a pin parallel to the axis of rotation of the rotating control member and engaging in a slot (57) produced in said slide, the slot extending orthogonal to the direction of translation of the slide.

10. Device as claimed in one or more of the previous claims, characterized in that the second end of the rod (17) is constrained to the axis of oscillation (A) by a guide (19) integral with said axis and inside which the rod can slide parallel to its longitudinal extension.

11. Device as claimed in one or more of the previous claims, characterized in that the thread guide (11) is constrained to a rectilinear sliding guide (15), substantially orthogonal to a plane on which the axis of oscillation (A) constrained to the rod and the axis of rotation (C) of the rotating control member (41) lie.

12. Device as claimed in one or more of the previous claims, characterized in that the thread guide (11) is provided with an oscillatory movement along an arc of circumference the center of which is positioned on the axis of oscillation (A) constrained to the second end of the rod (17).

13. Device as claimed in one or more of the previous claims, characterized in that the axis of oscillation (A) constrained to the second end of the rod is supported by a slide (23) movable parallel to the plane of oscillation of the rod.

14. Device as claimed in claim 13, characterized in that said slide is movable according to a direction substantially orthogonal to the axis of oscillation

(A) constrained to the second end of the rod and to the axis of rotation (C) of the control member (41).

15. Device as claimed in claim 13 or 14, characterized in that said slide (23) is provided with a reciprocating movement.

16. Device as claimed in claim 15, characterized in that the reciprocating movement of the slide is controlled by a rotating actuator (27) through a transmission that transforms the rotational motion of the actuator into a reciprocating rectilinear motion of the slide.

17. Device as claimed in one or more of the previous claims, characterized in that the distance between said axis of oscillation (A) constrained to the second end of the rod (17) and the axis of rotation (C) of the rotating control member is adjustable to set the length of the stroke of the thread guide.

18. Device as claimed in one or more of the previous claims, characterized in that the distance between said axis of oscillation (A) constrained to the second end of the rod (17) and the axis of rotation (C) of the rotating control member is variable in time during winding of a reel synchronized with the movement of the thread guide, to obtain a tapering of the ends of the reel, according to a profile established by gradual reduction of the stroke of the thread guide.

19. Device as claimed in claims 16 and 18, characterized in that said slide (23) supporting the axis of oscillation (A) constrained to the second end of said rod (17) and the actuator (27) controlling the translational movement of said slide are mounted on a support (24) in turn movable parallel to the plane of oscillation of the rod (17) and orthogonal to the axes of oscillation (A) and of rotation (C), the movement of said support being controlled to gradually modify the stroke of the thread guide during winding.

20. A winding unit to produce spools or reels of yarn, including means to hold a reel of yarn being formed in rotation and a device for distributing the yarn as claimed in one or more of the previous claims.