Technical field

Present utility model relates to a winding device for textile machinery.

Background art

In textile machineries that perform yarn formation in the end, such as false- twist texturizing machine, a winding device is needed to wind one or two continuous yarns into a conical shape or a cylindrical shape. A collection of yarns in such a form is called“bobbin”. Before winding of bobbin starts, a yarn tail needs to be reserved on the winding tube. The yam tail is reserved on one end of winding tube in a winding fashion and is positioned outside yarn reciprocating stroke. The yarn tail reserving is achieved by an already known yarn tail reserving element.

During applying bobbins onto subsequent processes such as warp knitting process, it is necessary that yarn length of each bobbin is as equal as possi- ble. In order to obtain controllable yam length of bobbin, the controlling system of textile machinery needs to obtain a winding start signal, and base on the signal to start calculation of winding time. In textile machineries which achieve yarn tail via the yarn tail reserving element, so far no system could reliably and accurately obtain the winding start signal.

Contents of the Utility Model

With full consideration to aforementioned known technology, in order to solve said defects, present utility model provides a winding device which is able to reliably and accurately obtain a predetermined overall length of bobbin yarn. The technical solutions are detailed as following:

A winding device includes a friction roller driven by a driving source, a moveable cradle which has a pair of clamping parts facing towards each other, a reciprocating guiding device disposed at upper stream of the fric- tion roller in relative to a yarn advancing direction, a yarn tail reserving el- ement positioned at proximity of one clamping part among the pair of clamping parts, and a controller for controlling the driving source , wherein, the reciprocating guiding device cooperates with the yarn tail reserving el- ement to start winding a yarn, the yam tail reserving element is provided with a sensing element, wherein, the sensing element is electrically con- nected with the controller.

Therefore, the sensing element real-time detects whether yarn tail reserving is finished and converts the detected result into an electrical signal which will be thereafter transmitted to the controller. Once yarn tail reserving is finished, the sensing element will immediately transmit such information to the controller.

The sensing element is configured to detect a status change from a status that yarn is through the sensing yarn tail reserving element to a status that the yarn is out of the sensing yarn tail reserving element during abovemen- tioned process, wherein, based on the status change, the sensing element generates a signal.

After finish of yarn tail reserving, yarn is brought out of the yarn tail reserv- ing element and is taken into reciprocating movement. Bobbin is gradually formed with the reciprocating yarn movement and yarn overlapping. As the yarn tail is outside the yarn reciprocating stroke, the starting point for calcu- lating yarn length of bobbin should be the starting point of the yarn recipro- cating stroke, because of which, the yarn tail length should not be taken into account as the yarn length of bobbin. Based on abovementioned principle, when the sensing element detects that the yarn which is originally travelling through the yarn tail reserving element is brought into reciprocating move- ment, the sensing element converts the status change into a signal.

The controller includes a timing module which is in electrical connection with the sensing element, and the timing module is able to be triggered by the signal generated by the status change to start timing, wherein, the timing module is able to set a duration of working cycle for the driving source.

When the sensing element senses that the yarn disappears from the yarn tail reserving element, the sensing element triggers the timing module to start timing, whereby a starting point for winding is defined. After a certain time upon the starting point, a predetermined yarn length can be obtained. Through such a control method, bobbins of all positions will have the same yarn length.

The winding device further includes an indicating light element which is in electrical connection with the timing module of the controller, wherein, the indicating light element is comprised of a plurality of light emitting diodes.

As soon as winding duration comes to an end, the light emitting diodes of the indicating light element emit light up, indicating to the operators that bobbin has reached predetermined yarn length.

Reciprocating guiding device of different configurations are all applicable. As one of the embodiments, the reciprocating guiding device is in groove dmm box configuration. Based on the groove dmm box configuration, the yarn tail reserving element is arranged on the grooved drum box in a pro- truding manner, wherein, the guiding element is positioned between the friction roller and the yarn tail reserving element. In order to have a sensitive sensation of the existence status of yarn, the sensing element can be configured as capacitor sensing structure as well as photoelectric sensing structure.

The yarn tail reserving element includes two flake-shaped pieces which en- circle so as to form a passing space for yarn to travel through, wherein, the two flake-shaped pieces partially overlaps and the overlapping parts are spaced away along the overlapping direction.

The yarn tail reserving element of such structure can both ensure that yarn can be easily guided in and guided out of the yarn tail reserving element, and ensure that yarn will not fall out of the yarn tail reserving element dur- ing reserving of yarn tail.

Description of figures

Figure 1 schematically shows top view diagram of the winding device of present utility model during yarn tail reserving;

Figure 2 schematically shows top view diagram of the winding device of present utility model during normal yarn winding after finish of yarn tail reserving;

Figure 3 schematically shows working principle diagram of the sensing el- ement of the winding device when the yarn is travelling through the yarn tail reserving element, while the sensing element is of capacitor-type sens- ing structure; Figure 4 schematically shows the working principle diagram of the sensing element of the winding device after finish of yarn tail reserving, while the sensing element is capacitor- type sensing structure;

Figure 5 schematically shows side view diagram of the winding device of present utility model, when the reciprocating guiding device is of grooved drum box structure;

Figure 6 schematically shows working principle diagram of the sensing el- ement of the winding device when yarn travels through the yarn tail reserv- ing element, while the sensing element is photoelectric structure.

Modes for carrying out the utility model

Figure 1 schematically shows top view diagram of the winding device to be protected by present utility model during reserving of yarn tail. Figure 2 schematically shows top view diagram of the winding device to be protect- ed by present utility model during normal yarn winding. The winding de- vice has a cradle 1 able to swivel around a rotation axis 1.1. One end of the cradle 1 is provided with the rotation axis 1.1, while the other end is an open end that has a pair of circular clamping parts 3 which face towards each other. The clamping parts 3 are able to freely rotate around its each own circle center. Winding tube 2 is clamped in between the pair of oppo- site-facing clamping parts 3. At least one of the clamping parts 3 is ar- ranged to be moveable along axis direction of the winding tube 2, so that the winding tube 2 can be mounted onto between the clamping parts 3 or be dismounted from the clamping parts 3. The winding device further includes a friction roller 4 which is directly driven by a driving source 6. The friction roller 4 is arranged as being parallel with the winding tube 2. During nor- mal yarn winding, the circumference of the winding tube 2 abuts against the circumference of the friction roller 4. Under influence of friction force, the friction roller 4 brings the winding tube 2 into rotation. The advancing yarn 10 is clamped between the winding tube 2 and the friction roller 4, then is further brought into winding onto the winding tube 2. With reference to the yarn advancing direction, a reciprocating guiding device 17 is disposed at upper stream of the friction roller 4, for uniformly laying the yarn 10 onto the circumference of the winding tube 2.

As shown by figure 2, the yarns 10 laid on the winding tube 2 form a cross angle among each other. The reciprocating guiding device 17 in embodi- ment shown by figure 1 and figure 2 is built as having three synchronous pulleys 7 triangularly distributed. The three synchronous pulleys 7 are con- nected via a tensioned synchronous belt 8. A guiding element 9 is mounted on the part of the synchronous belt 8 which is parallel to the friction roller 4. One of the synchronous pulleys 7 is driven directly by a driving motor 11. The driving motor 1 1 is able to rotate with alternating directions, due to which, the synchronous belt 8 is able to have linear movement with alter- nating directions. Thus the guiding element 9 mounted on the synchronous belt 8 will reciprocate within a stroke determined by rotation of the driving motor 11. The stroke defines length of a formed bobbin 2.1.

With reference to the yarn advancing direction, as shown by figure 1 and figure 2, the yarn tail reserving element 12 is disposed at upper stream of the guiding element 9 and is at proximity of one of the clamping parts 3, which the right side clamping part 3 at present embodiment. The reason for such an arrangement will be explained later.

The yarn 10 reciprocates within the stroke of the guiding element 9 and overlaps with each other to form the bobbin 2.1. For the consideration of generating non-stop yarn unwinding of several bobbins in following textile application processes, such as knitting process, bobbins have to be connect- ed. Therefore it is necessary that each full bobbin is reserved with a certain length of yam tail, and the yarn tail ends of two bobbin be jointed by a jointer to form continuous yarn unwinding. Reasonably, the yarn tail should be formed outside the stroke, which, put in another way, should be formed on the winding tube 2 between the bobbin 2.1 and the clamping part 3. In order to produce so-called“yarn tail” before winding starts, an operator needs to use a suction gun to put yarn 10 through the yarn tail reserving element 12 and hang the yarn 10 onto the clamping part 3. As the position of yarn tail reserving element 12 is fixed, after a certain period of time the yarn will be centrally wound in the area between the bobbin 2.1 and the clamping part 3, by which the yarn tail 5 is formed according to the figure 1. After a certain length of yarn tail 5 is reserved, the operator could, by knocking a mechanical lever device not shown or by hands, press the yarn downwards, so that the yarn 10 is at the same height with the guiding ele- ment 9 which is reciprocating. The guiding element 9 catches the yarn 10 and brings the yarn 10 into reciprocating movement. At this moment, wind- ing of bobbin 2.1 officially starts. Figure 2 shows that after yarn is caught by the guiding element 9, the yarn 10 is being wound onto the bobbin 2.1.

The aforementioned method to obtain the yarn tail 5 is a known technique, based on which, present utility model further provides a sensing element 13. As shown by figure 1 and figure 2, the sensing element 13 is mounted on the yarn tail reserving element 12. The sensing element is electrically con- nected with a controller 20. The controller 20 is electrically connected with the driving source 6 of the friction roller 4 so as to control working status of the driving source 6, such as rotation start, rotation stop, setting rotation speed. The yarn 10 travels through the yarn tail reserving element 12, so that the sensing element 13 is at a position where the yam 10 is able to be sensed. Further as shown by figure 1 and figure 2, the controller 20 includes a timing module 14. The timing module 14 is electrically connected with the indicating light element 15. The indicating light element 15 is com- prised of multiple light emitting diodes 16 which are comprised of different colors of diodes. Normally, the indicating light element 15 is installed in the area directly visible to operators.

When the sensing element 13 senses that parameter value is changed, it converts the changed value into an electrical signal. The electrical signal is transmitted to the controller 20 and is recognized by the timing module 14 of the controller 20. As soon as the signal is recognized, the timing module

14 starts timing. When the timing accumulates to a predetermined time val- ue, the yarn length of bobbin reaches to predetermined yarn length. At this moment, the timing module 14 sends an electric signal to the indicating light element 15. The light emitting diode 16 of the indicating light element

15 emits light, indicating to the operator that“bobbin is full”.

The change which is sensed by the sensing element 13 is indeed a change of existence status of yarns in the yam tail reserving element 12, namely, whether yarn is still travelling through the yarn tail reserving element 12. The solution which is adopted by present utility model is based on the prin- ciple that, finish of yarn tail reserving indicates official start of bobbin winding. The reason is that, bobbin winding starts immediately after the yarn is taken out from the yarn tail reserving element 12. The occurrence of status change from a status that the yarn in the yarn tail reserving element 12 to a status that the yarn out of the yam tail reserving element 12 marks exact start of bobbin winding.

Figure 3 shows working principle diagram of the sensing element of the winding device, when the yarn is travelling through the yarn tail reserving element. In this embodiment, the sensing element 13 is configured as capac- itor-type sensing stmcture. The sensing element 13 includes a shell body 21. One side of the shell body 21 is provided with the yarn tail reserving element 12. The yam tail reserving element 12 has two flake-shaped pieces 12.1, 12.2 made of either metal material or plastic material. The two flake- shaped pieces 12.1, 12.2 encircle so as to form a passing space for yarn to travel through. At the left lower position of the passing space, the edge of the two flake-shaped pieces 12.1, 12.2 partially overlap and the overlapping parts are spaced away along the overlapping direction for the sake that op- erator could guide yarn into the passing space. Further as shown by figure 3, a triode 22 is disposed inside the shell body 21. Power is guided via the emitting electrode E of the triode 22. Voltage is output via the collecting electrode C. The collecting electrode C is connected to a collecting module 17. The collecting module 17 is connected with the controller 20. When there is no yarn passing through the passing space, the collecting electrode C outputs a constant voltage value X to the collecting module 17. In this case, the collecting module 17 does not collect any change of voltage.

Figure 4 shows working principle diagram of the sensing element of the winding device after yarn tail reserving finishes, while the sensing element is of capacitor-type sensing stmcture. At this moment yarn is travelling through the passing space and is at proximity of the sensing element 13. As mnning yarn possesses electrostatic charge and generates voltage signal, which is similar to closing switch at the left side of the triode 22, the volt- age output value of the collecting electrode C becomes zero.

The collecting module 17 is configured such that, when the voltage value collected by the collecting module 17 increases from zero to X, the voltage increase is converted into an electric signal which is then transmitted to the timing module 14 of the controller 20. After receiving the electric signal, the timing module 14 starts timing, and after a certain duration, triggers the indicating light element 15. The duration is a winding duration set by the timing module 14. It is undoubtedly accurate to define the starting point of winding through sensing the yarn existence status in the yarn tail reserving element 12.

Different from figure 3, figure 6 shows working principle diagram of the sensing element of the winding device when yarn is travelling through the yarn tail reserving element, while the sensing element is photoelectric-type sensing structure. The yarn tail reserving element 12 includes a space for yarn 10 to travel through. The sensing element 13 includes an emitting end

18 which can emit ray of light and a receiving end 19 which can receive ray of light. The relationship between the emitting end 18 and the receiving end

19 is: when the ray of light emitted from the emitting end 18 reaches to the yarn, the ray of light is deflected, and the deflected ray of light can be re- ceived by the receiving end 19. During yarn tail reserving process, the col- lecting module 17 detects ray of light and does not trigger any transmission of signal.

As yarn tail reserving finishes, yarn disappears from the yarn tail reserving element 12. The ray of light emitted from the emitting end 18 cannot be deflected towards the receiving end 19. When the collecting module 17 does not detect ray of light, the collecting module 17 converts the change into an electrical signal and transmits the signal to the timing module 14 of the controller 20. The timing module 14 starts timing and after a certain duration, triggers the indicating light element 15.

Figure 5 schematically shows side view diagram of the winding device of present utility model, while the reciprocating guiding device is of grooved dmm box structure. As configuration of groove drum box is already dis- closed in details by CN 104860119A, the structure of reciprocating guiding device is only briefly introduced thereinafter. The reciprocating guiding device in figure 5 has a groove drum box body 23 whose one side is provid- ed with a notch for the guiding element 24 is pass through. A grooved drum shaft 25 is disposed inside the groove drum box body 23. Guide grooves for guiding sliding shuttle 26 is concavely disposed on the grooved dmm shaft 25. A sliding block 27 is disposed on the sliding shuttle 26 which could bring the sliding block 27 into reciprocating movement along the axial di- rection of the grooved dmm shaft 25. The yam tail reserving element 12 is disposed on the groove dmm box body 23 in a protmding manner. The bent solid line represent yarn 10 when reserving yarn tail, the dotted line repre- sents yarn 10 during normal yarn winding. The guiding element 24 is posi- tioned between the friction roller 4 and the yarn tail reserving element 12.

The embodiment from figure 1 to figure 6 are only exemplary, with no in- tention to limit protection scope of present utility model. The essence of present utility model is to use sensing element to sense if yarn is traveling through yarn tail reserving element, and to convert the sensed result into electric signal to be transmitted to controller, as to as trigger the timing start of the timing module. Through accurately defining starting point of wind- ing, textile machinery having around 200 winding position will have each of its winding position produce bobbins of equal yarn length.