Technical Field

Present invention relates to a texturing machine with winding equipment which is capable of improving uniformity of bobbins.

Background Art

Generic textile machinery is known from EP1926674A1, which describes a false twisting texturing machine as one of the embodiments. For the purposes of imposing drawing, false twisting and deformation onto yarns, the false twist texturing machine in such an embodiment in succession includes a first supply device, a first heating device, a cooling device, a false twisting device, a second supply device, a second heating device, a third supply device and finally winding equipment. The winding equipment is comprised of certain amount of winding devices which are distributed as being multi-tier stacked along longitudinal direction meanwhile being side by side along transversal direction. In the case of EP1926674A1, winding devices are three-tier stacked. The third supply device is arranged as one line along the direction to which several sections of false twist texturing machine are stacked transversally, while being positioned at the upper stream side of the winding equipment along yarn advancing direction. Before yarn travels to the third supply device to be centrally fed to the winding devices, yarn firstly enters to the second heating device. Therefore the yarn has different "be- fore -winding length" prior to entering to corresponding winding devices to be wound into bobbins. "Before -winding length" refers to the length of yarn from the third supply device to the yarn guider. For example, the yarn reaching the second tier of winding device has greater "before -winding length" than the yarn reaching the lowest tier of winding device.

In this case, this situation would easily cause variation of tension value for yarns from different tiers having different "before -winding length". Especially in the perspective of tension-sensitive yarns i.e. polyamide, bobbins at different tiers will have different softness, which is undesired from the user end. Contents of the Invention

With view to aforementioned defects in prior art, the problem to be solved by present invention is to provide a false twisting texturing machine able to avoid aforementioned defects. In order to achieve this: According to the first solution of present invention, a texturing machine with a winding equipment having a plurality of winding devices, the winding devices being arranged in a manner of being multi-tier along longitudinal direction and being side by side along transverse direction, wherein, the winding device includes a rotatable cradle which is able to clamp winding tube, a friction roll which is driven to rotate and which is in contact with the winding tube during winding, and a traverse guide device having a yarn guider guiding yarn to move transversally, wherein, each winding device has an inlet side for receiving yarn, wherein, along the yarn advancing direction, each winding device is assigned with an delivery device disposed at the upper stream side of the yarn guider so as to control the speed of yarn, wherein the delivery devices are arranged in a stacked multi-tier placement. Based on the first solution, each yarn is fed to winding device at a predetermined speed. As the delivery device is in multi-tier arrangement, in correspondence to the multi-tier of the winding devices, this solution is given with an advantage that difference of yarn "before -winding length" among different tiers is decreased, which reflects on better uniformity of package softness in each winding position.

In order to achieve the aim that yarn is fed with predetermined speed, a driving device is required to drive the delivery device. Therefore according to the second solution of present invention, each delivery device is driven by a driving device so as to supply yarn to the winding device. Preferably the delivery device which is assigned to each winding device is disposed at the inlet side of the winding device. Based on the third solution of present invention, the shortest length of yarn from the delivery device to corresponding yarn guider of one of the winding devices is the same in each winding device. Such an arrangement will maximum eliminate difference of yarn "before -winding length", whereby tension difference of yarn is maximum decreased.

Based on the fourth solution of present invention, the delivery device is configured as a clamping structure with a driven shaft means and a clamping means. The clamping structure enables yarn to be actively fed out of the delivery device under the clamping action of clamping structure and the rotation of the driven shaft means. Based on the fifth solution of present invention, the delivery device is configured as a wrapping structure with a driven godet and an auxiliary roll. As another possible configuration of delivery device, the wrapping structure enables yarn to be wound on the driven godet and the auxiliary roller by several loops. With influence of wrapping friction, the yarn is actively fed out of delivery device. Compared with the former configuration described by the fourth solution, the wrapping structure has advantage of less damage onto yarns. Based on the working principle of clamping structure, the delivery unit is further divided into two detailed structures which are described respectively by the sixth solution and the seventh solution.

The sixth solution of present invention describes the first detailed structure. The driven shaft means of adjacent delivery devices are arranged as a driven shaft connected with the driving device, the clamping means of adjacent delivery devices are arranged to include a pressing roll which is able to press against the circumference of the driven shaft, wherein a yarn holding pointing is formed between the driven shaft and the pressing roll. The rota- tion of driven shaft could deliver yarn towards one direction.

The seventh solution describes the clamping structure's second possibility of detailed structure. The driven shaft means of adjacent delivery devices are arranged as a driven shaft connected with the driving device, the clamp- ing means of adjacent delivery devices is arranged to include two idle rolls and a ring belt surrounding the two idle rolls, wherein, the driven shaft presses against the surface of the ring belt so as to form a yarn holding surface.

According to the eighth solution of present invention, the godets of the ad- jacent delivery devices are driven separately by several motors of the driving device to rotate, wherein the motors are separately controlled by several lower controllers of the driving device. The godets are independently driven, so that, when certain godet has to be shut down due to yarn breakage, other godets are not impacted.

According to the ninth solution of present invention, all difference values of speed between the speed of yarn supply by each delivery device and the speed of yarn winding by each corresponding winding tube are the same. Normally said speed difference exists to realize further drawing or relaxa- tion to yarns. Therefore, with the same speed difference for every winding device, the yarn is imposed with the same degree of drawing or relaxation process.

To obtain running parameters as uniform as possible for the whole machine, according to the tenth solution of present invention, each delivery device is driven by an independent driving device, wherein, all driving devices are connected to the same upper controller.

In the same manner, to make sure that the delivery devices of winding equipment of part of the false twist texturing machine have the same running parameters, while delivery devices of winding equipment of other part of the false twist texturing machine have different running parameters, ac- cording to the eleventh solution of present invention, the driving devices are arranged in several driving groups, wherein the driving devices of one of the driving groups are connected to one of several lower controllers. Description of Figures

Figure 1 is the cross-sectional diagram of first embodiment of false twist texturing machine of present invention;

Figure 2 is the cross-sectional diagram of second embodiment of false twist texturing machine of present invention;

Figure 3 is the cross-sectional diagram of third embodiment of false twist texturing machine of present invention;

Figure 4 is partial front view diagram of winding equipment under the first embodiment in figure 1 ;

Figure 5 is partial front view diagram of winding equipment under the sec- ond embodiment in figure 2;

Figure 6.1 is block diagram of control method for delivery devices of present invention;

Figure 6.2 is block diagram of second control method for delivery devices of present invention;

Figure 6.3 is block diagram of third control method for delivery devices of present invention.

Modes for Carrying Out the Invention False twist texturing machine is utilized to treat thermoplastics like polyester and polyamide into yarns with relatively high elasticity. As first embodiment of present invention, figure 1 shows the cross-sectional schematic diagram of the false twist texturing machine of present invention. Though different yarn kinds will require different machine configuration, the basic configuration is generally the same, due to that different yarns unexception- ally have to be drawn out, heated, cooled, false-twisted, drawn and wound. It worth notifying that the below-mentioned "upper stream" or "down stream" is defined with reference to yarn advancing direction.

The structure of false twist texturing machine is introduced with consideration to the sequence by which yarn is treated. The aim of false twist textur- ing machine is to impose treatment on pre-oriented yarn (POY) which is low in elasticity, so the whole process starts with a precursor fiber frame 1 for supplying raw material. The precursor fiber frame 1 is multi-layer comprised, and each layer has a precursor fiber bobbin shaft 1.1 which is generally horizontally placed in order to load precursor fiber bobbins 1.2. Often, between two adjacent precursor fiber bobbins 1.2 in one layer, yarn end of one of the precursor fiber bobbins 1.2 is jointed with the yarn tail of the other precursor fiber bobbin 1.2, so as to generate continuity of yarn supply. On the main machine frame 8, a first supply device 3 is placed at the down stream of the precursor fiber frame 1. It can be obtained from CN 101272975 that, the first supply device 3 is known to be configured as a wrapping structure or a clamping structure, whereas the supply device 3 in present embodiment resumes a wrapping structure, which is comprised of a motor 3.3, a godet 3.2 and an auxiliary roll 3.1. The motor 3.3 directly drives the godet 3.2 to rotate. The auxiliary roll 3.2 is spaced away from the godet 3.2 in a parallel fashion. Yarn 2 wraps several loops simultaneously on the godet 3.2 and the auxiliary roll 3.1, with the wrapping angle respectively on the godet 3.2 and the auxiliary roll 3.1 being less than 360 de- grees. Under the action of friction force, yarn is fed out of the first supply device 3, which, put in another way, means that the first supply device 3 draws yarn 2 out from the precursor fiber frame 1. Subsequently the yarn 2 enters into a heating device 4 for heat treatment, which is followed by a cooling device 5 for cooling treatment. A false twisting device 6 is disposed at the downstream of the cooling device 5. A second supply device 7 follows the false twisting device 6. Similarly the second supply device 7 could optionally adopt the wrapping structure or the clamping structure which is described by CN101272975. The second supply device 7 in present embod- iment is comprised of a motor 7.3, a godet 7.2 and an auxiliary roll 7.1. The second supply device 7 has a greater speed than the first supply device 3, by which the yarn 2 is drafted between the second supply device 7 and the first supply device 3. Further, while the yarn is being heated and cooled, the yarn is being also false-twisted in the meantime, therefore, a deformation drafting zone is formed between the second supply device 7 and the first supply device 3.

The final process in a false twist texturing machine is winding performed by winding equipment 10. The winding equipment 10 in figure 1 includes three layers of winding devices 18. The winding device 18 at present embodiment is so-called "in-board" automatic winding device. "In-board" means that the yarn inlet side for receiving yarn and the side for taking out full bobbin are located at the same side. Each winding device 18 is essentially comprised of a winding table 29, a traverse guide device 16, a driven friction roll 15, a winding tube 12, a cradle 1 1, a full bobbin track 14, an empty tube chamber 13 and a doffing device which is not shown in the figures. One end of the cradle 1 1 is able to clamp the winding tube 12, the oth- er end is turnably connected onto the winding table 29. During normal winding period, the winding tube 12 is maintained in contact with the driven friction roll 15. The traverse guide device 16 which is placed at the upper stream of the winding tube and the friction roll 15 has a yarn guider 17 able to reciprocate along axial direction of winding tube 12. It is known that belt-type or grooved drum type method could be adopted to drive the yarn guider 17 to reciprocate. The yarn guider 17 could ensure that yarn 2 is uniformly laid along the axis of the winding tube 12, so as to form a bobbin with special shape. After bobbin reaches to pre-determined size, the cradle 1 1 rotates to the position where full bobbin reaches to the full bobbin track 14 which is above the traverse guide device 16. Then the cradle 1 1 releases the full bobbin and the full bobbin rolls on the full bobbin track 14. Empty tube from the empty tube chamber 13 is thereafter supplied onto the cradle, then the cradle rotates to ensure that the empty tube is in contact with the friction roll 5, whereby a new winding cycle starts.

At each inlet side 23 for receiving yarn 2, each winding device 18 is assigned with a delivery device 19 at the upper stream of the yarn guider 17. After traveling out from the second supply device 7, the yarn 2 travels through the back side which is opposite to the inlet side 23. Then by means of the guide wheel 9 which is assigned to each winding layer, with a reflection angle the yarn 2 enters into the space which is under the winding table 29, and then into the delivery device 19. Such a yarn path ensures that the overall yarn path length for each yarn is relatively short. The delivery de- vices 19 are arranged in a stacked multi-tier placement within the three layers of the winding equipment 10. The false twist texturing machine includes a plurality of working stations to treat a plurality of yarns. Therefore a plu- rality of winding devices 18 and a plurality of delivery devices 19 are arranged side by side along a longitudinal side of the machine. Such an arrangement is described with additional reference to Figure 4. Figure 4 shows partial front view diagram of the winding equipment 10 of the embodiment of Figure 1, and only schematically shows bobbin, yarn guider 17 and delivery device 19. The delivery device 19 at present embodiment is mainly comprised of a godet 24, a base 30, a motor 26 and auxiliary roll 25. The godet 24 and the auxiliary roll 25 are mounted on the base 30 as being rotatable. The godet 24 is directly driven by the motor 26. The auxiliary roll which is not driven is placed with distance to the godet 24. The auxiliary roll 25 and the godet 24 are placed to be parallel with the bobbin. The yarn 2 is wrapped in loops on the auxiliary roll 25 and the godet 24 simultaneously. All the delivery devices 19 of the embodiment of the false twist texturing machine are equally designed. The amount of delivery devices 19 equals to the amount of winding devices 18.

Figure 2 and figure 5 demonstrates another embodiment of present invention,. Figure 2 is showing a cross-sectional diagram of the second embodi- ment of the false twist texturing machine and figure 5 is showing a partial front view of the winding equipment of the second embodiment. The following description includes both figures.

For sake of simplicity, only the difference to last embodiment according to figure 1 is pointed out. The difference is the structure of delivery device 19. The delivery device at present embodiment is a clamping structure mainly comprised of a driven shaft means and a clamping means. Specifically, all winding devices 18 at one winding tier is assigned with one driven shaft 20 which extends along the length direction of the winding equipment 10, namely, one driven shaft 20 is able to cover all winding devices 18 at one tier. The driven shaft 20 is directly connected with a motor 26, so, three tiers of winding devices 18 are assigned with three driven shafts 20. Further, each winding device 18 is assigned with a clamping means. The clamping means includes two idle rolls 21 and a ring belt 31 encircling the two idle rolls 21. With the aid of a spring means which is not shown, the ring belt 31 presses against the driven shaft 20, whereby a yarn holding sur- face is formed between the ring belt 31 and the driven shaft 20. Yarn 2 travels through the yarn holding surface.

As another embodiment of the clamping structure delivery device is disclosed in figure 3. Figure 3 shows a cross-sectional diagram of another em- bodiment of the false twist texturing machine. In following only the differences to the forgoing embodiments are described. The delivery device 19 according to figure 3 shows a clamping structure different from the delivery device 19 of the second embodiment according to figure 2. The two structures are the same in principle. At present embodiment, the delivery device includes a driven shaft 20 connected to a motor. Similarly the driven shaft 20 extends in a manner of covering all winding devices 18 of one tier. The delivery device also includes a pressing roll 22 which is able to press against the circumference of the driven shaft 20. The pressing roll 22 by means of spring means not shown is pressed tightly onto the driven shaft 20. The yarn 2 is clamped between the pressing roll 22 and the driven shaft 20 in order to be delivered. Principally, the configuration of delivery device 19 should not be limited to the structure described in aforementioned three embodiments. Devices able to actively deliver yarns to the winding device 18 all belong to the delivery devices 19 of present invention.

Further as shown by the embodiments of figure 4 and figure 5, the shortest yarn distance D from each delivery device 19 to the corresponding yarn guider 17 of the winding device 18 is the same. Due to that the yarn guider 17 moves reciprocatingly during winding period, therefore the "shortest yarn distance D" refers to that, when yarn guider 17 faces right at the delivery device 19, the shortest distance from each yarn guider to the delivery device 19 is the same. Based on this the yarn in each tier has the same "before-winding length". It is worth explaining that, the tension of yarn 2 before entering winding device 18 is mainly determined by two factors, the 1 st factor being the speed difference between the winding device 18 and the delivery device 19, the 2nd factor being the shortest yarn distance from the yarn guider 17 to the delivery device 19. Often, the speed difference between each winding device 18 and corresponding delivery device 19 is set at the same value. Therefore it is important that the shortest yarn distance is set at the same value as well, to ensure uniform yarn tension.

Figure 6.1 is showing a block diagram of a control method for the delivery devices for example of the embodiment according to figure 1 , figure 2 or figure 3. The delivery devices 19.1 to 19.4 are respectively driven by an independent motor 26.1 to 26.4. Each motor 26.1 to 26.4 is connected to an independent lower controller 27.1 to 27.4 via communication cables. So the lower controllers 27.1 to 27.4 are frequency inverter. All lower controllers 27.1 to 27.4 are connected to an upper controller 28 via communication cables. The upper controller 28 could control the lower controllers 27.1 to 27.4 via setting running parameters. Figure 6.2 schematically shows another control method for delivery devices for example of the embodiment according figure 1, figure 2 or figure 3. The delivery devices 19.1 to 19.4 are respectively driven by an independent motor 26.1 to 26.4. All motors 26.1 to 26.4 are controlled by a shared lower controller which is connected to the upper controller 28. Such a kind of control method is advantageous as all delivery devices 19.1 to 19.4 can run at the same speed.

Often, one false twist texturing machine is constituted of 12 machine sections connected along direction perpendicular to the paper plane. One ma- chine section could treat twelve yarns. Therefore the driving device of the twelve delivery devices in one machine section could be seen as one driving group, consequently one false twist texturing machine has twelve driving groups. Figure 6.3 schematically shows the driving devices of the delivery devices in four machine sections, namely, four driving groups 32.1 to 32.4. The driving groups 32.1 and 32.2 are respectively controlled by an independent lower controller 27.1 and 27.2, whereas the driving groups 32.3 and 32.4 are controlled by a shared lower controller 27.3. In this case, user end of false twist texturing machine could have differentiated control on different machine sections.

In aforementioned embodiments, the structure of delivery device is only for illustrative purpose. The basic principle is that the proximity of each wind- ing device has a device able to actively feed yarn to adjust the attributes of bobbin. Similarly the structure of false twist texturing machine in aforementioned embodiments is also only illustrative and should not be deemed as limitation. For example, an additional supply device could be placed fol- lowing the second supply device to further draw yarns, or, the space underneath the second supply device could be provided with a heat setting device to satisfy more demanding heat treatment for polyester.