Preparation device for ring spinning fancy yarn

Abstract

The invention belongs to the technical field of textile processing, and relates to a ring spinning fancy yarn preparation device which comprises a ring spinning frame, the ring spinning frame comprises an intermittent feeding rear roller, a middle roller and a front roller, and the ring spinning fancy yarn preparation device further comprises an upper roller, a lower roller, a controller and a lifting mechanism. Central shafts of the upper roller and the lower roller are parallel to the left-right direction, the upper roller is located above the lower roller, and the upper roller and the lower roller are located between the intermittent feeding rear roller and the middle roller at the same time; the controller controls operation of the intermittent feeding rear roller, the middle roller, the front roller and the lower roller, meanwhile, the height of the upper roller is adjusted through the lifting mechanism, when the height of the upper roller is minimum, the distance between the upper roller and the lower roller is 0, at the moment, the roving in the rear drafting area is held, and when the height of the upper roller is maximum, the distance between the upper roller and the lower roller is larger than 0. The quality and the appearance quality of the ring spinning fancy yarn are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of textile processing and relates to a device for preparing ring-spun fancy yarn. This invention is a divisional application of the application with the application date of February 11, 2025, application number "2025101479223", and title "A Method for Preparing Ring-spun Fancy Yarn". Background Art

[0002] Ring spinning is one of the most mature and widely used existing spinning technologies. In addition to spinning ordinary yarn counts, it can also spin fancy yarn varieties such as slub yarn, segmental color yarn, and segmental color slub yarn. When using two or more rovings to spin ring-spun fancy yarn, there are usually two schemes. Scheme one: One roving is directly fed into the middle roller of the ring spinning frame and is only drafted by the front drafting zone; the other roving is fed into the back roller, first drafted by the back drafting zone, and then enters the front drafting zone. Scheme two: The back roller of the ring spinning frame is modified into a multi-channel feeding system, and the two rovings are respectively fed through different back roller feeding systems and form yarn after being drafted by the back drafting zone and the front drafting zone.

[0003] However, no matter which scheme is adopted, when the two rovings are fed alternately or one roving is fed intermittently, the spun fancy yarn will have detail problems in the transition section of the alternate feeding of the rovings, which seriously affects the quality of the fancy yarn. The reason is that according to the roller drafting principle, when fibers are drafted between two pairs of rollers, the center distance between the two pairs of rollers needs to be greater than the main length of the fibers being spun. Therefore, during the drafting process, in addition to the fibers controlled by the middle roller and the back roller, there are also floating fibers not controlled by the two rollers. These floating fibers are divided into slow floating fibers controlled by the frictional field of the back roller and fast floating fibers controlled by the frictional field of the middle roller. The whole drafting process is a process in which slow floating fibers are accelerated to become fast floating fibers.

[0004] Since the frictional fields of the middle roller and the back roller are both distributed within a certain range, when two rovings are fed alternately or the roving fed by the back roller stops being fed, the back roller will stop rotating while the middle roller continues to rotate forward. At this time, in the drafting zone between the back roller and the middle roller, the fast floating fibers controlled by the frictional field of the middle roller will continue to move towards the nip of the middle roller and be transferred to the front drafting zone. Therefore, when the back roller stops rotating, the slow floating fibers originally controlled by the frictional field of the back roller will lose this control force, while the fast floating fibers controlled by the frictional field of the middle roller will continue to move towards the nip of the middle roller. Since the back roller has stopped rotating, a distance originally occupied by the back roller will be vacated in the drafting zone between it and the middle roller. This vacated distance means that when the roving is fed into the back roller again, it takes some time for the fibers to pass through this vacated distance and reach the nip of the middle roller again. This will cause problems such as details or an extended transition section in the transition section of the fancy yarn being spun, because during this period, the diameter of the yarn or the distribution of the fibers may change, thus affecting the quality and appearance of the yarn.

[0005] When spinning ring-spun fancy yarns such as slub yarns and segmental colored yarns, the commonly adopted method is: one roving (roving I) is used as the base yarn and is directly fed into the middle roller of the ring spinning frame; the other roving (roving II) is used as other components or colors and is fed into the back roller of the ring spinning frame. Due to the characteristics of the drafting device of the ring spinning frame, roving I is continuously fed, while roving II can be continuously fed or intermittently fed. By adjusting the speed changes of the middle roller and the back roller of the ring spinning frame, the purpose of spinning slub yarns or segmental colored yarns can be achieved. When roving II is intermittently fed, it can be used to spin fancy yarn varieties such as slub yarns and slub segmental colored yarns. The control method for the intermittent feeding of roving II is that the back roller of the ring spinning frame operates and stops according to the rules set by the control system. However, when the back roller stops operating, since the middle roller keeps rotating, the fiber sliver between the back roller and the middle roller (especially the fibers with the head end close to the nip of the middle roller) will continue to be drafted and transferred under the action of the frictional field of the middle roller. Therefore, when the back roller resumes operation and feeds roving II again, it takes some time for the head-end fibers to be controlled by the frictional field of the middle roller again. This will cause problems such as yarn defects like details or a longer transition section in the fine yarn spun in the transition section, thus seriously affecting the appearance quality of the ring-spun fancy yarn. Summary of the Invention

[0006] The object of the present invention is to solve the problems existing in the prior art and provide a device for preparing ring-spun fancy yarns.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A method for preparing ring - spun fancy yarn, which uses a ring - spinning frame to spin two or more rovings together. The ring - spinning frame includes an intermittently fed back roller, a middle roller, and a front roller. Among them, at least one roving 1 is intermittently fed by the intermittently fed back roller. When the roving in the back draft zone stops being drafted, the head end of the fiber sliver is fed into the range controlled by the frictional field of the middle roller, so that the distance between the head end of the fiber sliver and the nip of the middle roller is 2 - 3 mm.

[0009] As a preferred technical solution:

[0010] For the method for preparing ring - spun fancy yarn as described above, the intermittently fed back roller moves periodically. The start time of a single cycle is denoted as t1, the end time is denoted as t3, and there are 4 increasing times between t1 and t3, which are respectively denoted as t2, ta, and tb.

[0011] Between t1 and t2, the intermittently fed back roller rotates forward at a linear speed of v1; between t2 and ta, the intermittently fed back roller does not rotate; between ta and tb, the intermittently fed back roller rotates forward at a linear speed of v2; between tb and t3, the intermittently fed back roller does not rotate.

[0012] Between t1 and ta, the roving in the back draft zone is drafted; between ta and t3, the roving in the back draft zone stops being drafted.

[0013] At time ta, hold a point on the roving in the back draft zone and move forward at a speed of v2. Stop moving forward at time tb and stop holding at time t3; the holding force is greater than the pressure between the middle roller and the middle top roller. At time tb, the head end of the fiber sliver has entered the range controlled by the frictional field of the middle roller. At this time, it is necessary to firmly hold the roving in the back draft zone to prevent it from being taken away by the middle roller before the intermittently fed back roller rotates again. Therefore, in the present invention, the holding does not stop until time t3, and at the same time, the holding force is controlled to be greater than the pressure between the middle roller and the middle top roller.

[0014] At time ta, the distance between the holding point and the nip of the intermittently fed back roller and the distance between the holding point and the nip of the middle roller are both less than the main body length of the roving in the back draft zone, otherwise accidental drafting will occur and precise control cannot be achieved.

[0015] Between time t1 and time t3, the middle roller rotates continuously forward at a linear speed of v3, and the front roller rotates continuously forward at a linear speed of v4; the interval between time t2 and time t1, v1, v3, v4, and the distance between the middle roller nip and the front roller nip all depend on the spinning process and are related to process parameters such as spindle speed, spinning count, twist, roving weight per unit length, and back zone draft multiple. During conventional ring spinning, the linear speed of the front roller is generally 15 - 20 m / min, the linear speed of the middle roller is generally 0.2 - 0.5 m / min, and the linear speed of the intermittently fed back roller is generally 0.2 - 0.48 m / min.

[0016] In the prior art, between time t2 and time t3, the intermittently fed back roller always does not rotate and does not hold a point on the roving in the back draft zone and move forward.

[0017] For a method for preparing a ring - spun fancy yarn as described above, the interval between time ta and time t2 is 0.3 - 0.5 s. At time t2 when the intermittently fed back roller stops rotating, under the influence of the friction field, the head end of the fiber sliver will also be affected by the friction field of the middle roller. If a point on the roving in the back draft zone is held and moved forward at a speed of v2 at time t2, the number of fibers affected by the friction field of the middle roller will increase, which is not conducive to quality control.

[0018] For a method for preparing a ring - spun fancy yarn as described above, the interval between time tb and time ta is 0.1 - 0.2 s, and v2 is 10 - 20 mm / s; the product of the time interval between tb and ta and v2 is equal to the distance between the head end of the fiber sliver and the middle roller nip.

[0019] For a method for preparing a ring - spun fancy yarn as described above, the interval between time t3 and time tb is 0.1 - 0.2 s. The purpose of such a setting is to enable the head end of the fiber to be fully affected by the friction field of the middle roller.

[0020] For a method for preparing a ring - spun fancy yarn as described above, at time ta, the distance between the holding point and the intermittently fed back roller nip is 20 - 40 mm, and the distance between the holding point and the middle roller nip is 15 - 25 mm; the main body length of the roving in the back draft zone is 30 - 55 mm.

[0021] For a method for preparing a ring - spun fancy yarn as described above, other rovings are continuously fed by the middle roller.

[0022] For a method for preparing a ring - spun fancy yarn as described above, the ring spinning frame further includes a continuously fed back roller, and other rovings are continuously fed by the continuously fed back roller.

[0023] A method for preparing a ring spinning fancy yarn as described above, the ring spinning fancy yarn being a ring spinning segment-colored yarn or a ring spinning slub yarn, the average length of the transition section being 3-5 mm, and the number of details of the ring spinning segment-colored yarn being 1-2 per km. It can be seen that, compared with the prior art, the details of the ring spinning fancy yarn spun in the present invention are reduced and the transition section is shorter.

[0024] The present invention also provides a device for preparing a ring spinning fancy yarn, including a ring spinning frame, the ring spinning frame including an intermittently feeding back roller, a middle roller, and a front roller. The device for preparing a ring spinning fancy yarn further includes an upper roller, a lower roller, a controller, and a lifting mechanism;

[0025] The central axes of the upper roller and the lower roller are both parallel to the left-right direction. The upper roller is located above the lower roller, and the upper roller and the lower roller are both located between the intermittently feeding back roller and the middle roller;

[0026] The controller controls the operation of the intermittently feeding back roller, the middle roller, the front roller, and the lower roller, and at the same time adjusts the height of the upper roller through the lifting mechanism. When the height of the upper roller is the smallest, the distance between the upper roller and the lower roller is 0, and at this time the roving in the back draft zone is held. When the height of the upper roller is the largest, the distance between the upper roller and the lower roller is greater than 0.

[0027] As a preferred technical solution:

[0028] A device for preparing a ring spinning fancy yarn as described above, the lifting mechanism including a pressure arm, a connecting rod, and a pressure cylinder;

[0029] The pressure arm is parallel to the left-right direction. The non-end position is connected to the upper roller located below it through a connecting rod, and the middle position is connected to the pressure cylinder located above it. The pressure direction of the pressure cylinder is downward;

[0030] A sliding sleeve is provided at each of the left and right ends of the pressure arm. The two sliding sleeves are respectively sleeved on the middle section of a vertically arranged support rod. A support seat is provided at the lower end of each of the two support rods. A spring is sleeved on each of the lower sections of the two support rods. On the same support rod, the spring is clamped between the sliding sleeve and the support seat.

[0031] When the pressure cylinder applies pressure, it will push the pressure arm to move downward. The connected sliding sleeve will also slide downward along the support rod and compress the spring, and the connected upper roller will also move downward; when the pressure cylinder stops applying pressure, due to the spring being compressed, under the action of the elasticity and resilience of the spring, the sliding sleeve moves upward to drive the pressure arm to return to the initial position.

[0032] A device for preparing a ring spinning fancy yarn as described above, the stroke of the pressure cylinder being 5-10 mm and the thrust being 1000-1500 N.

[0033] A preparation device for ring spinning fancy yarn as described above, the spring is a carbon steel spring, with a diameter of 40 - 45 mm, a wire diameter of 2 - 3 mm, 15 - 20 turns, a length of 80 - 120 mm, and an elastic coefficient of 200 - 250 N / mm.

[0034] A preparation device for ring spinning fancy yarn as described above, the diameter of the intermittent feed back roller is 25 - 38 mm, the diameter of the middle roller is 25 - 38 mm, the diameter of the front roller is 25 - 38 mm, the diameter of the lower roller is 6 - 8 mm, and the diameter of the upper roller is 6 - 8 mm.

[0035] A preparation device for ring spinning fancy yarn as described above, when the height of the upper roller is at its maximum, the vertical distance between the central axes of the upper roller and the lower roller is 18 - 22 mm.

[0036] A preparation device for ring spinning fancy yarn as described above, the middle of the upper roller is made of metal material, and the surface layer is nitrile rubber.

[0037] A preparation device for ring spinning fancy yarn as described above, the ring spinning frame further includes a continuous feed back roller.

[0038] Principle of the invention:

[0039] In the spinning process of the present invention, the fiber strand in the roving is in the back draft zone between the intermittent feed back roller and the middle roller. In addition to being affected by the forces of the intermittent feed back roller and the middle roller, it is also affected by the force F n The force F n is between the intermittent feed back roller and the middle roller; when the drafting action of the middle roller on the fiber strand is completed, the force F n holds the fiber strand and acts together with the intermittent feed back roller to make the fiber strand move towards the middle roller nip. When the fiber strand moves within the range controlled by the middle roller's frictional field, it stops moving forward; when the roving is fed again, the force F n does not act on the fiber strand, and the intermittent feed back roller starts to feed cotton forward. At this time, the middle roller will redraft the fiber strand again. Since during the period when the roving passing through the back draft zone changes from stopped drafting to starting drafting, the head end of the fiber strand has entered the range controlled by the middle roller's frictional field, when the roving is redrafted by the middle roller again, the head end of the fiber will immediately change speed and enter the middle roller nip, thus reducing the average length of the transition section of the spun fancy yarn, making the transition section of the fancy yarn less obvious, which is beneficial to enhancing the three-dimensional style of the fabric woven from the fancy yarn; at the same time, the spinning method of the ring spinning fancy yarn of the present invention can also reduce the probability of the appearance of details in the transition section of the spun fancy yarn, improve the evenness level of the spun yarn, and enhance the quality level of the yarn.

[0040] Beneficial effects:

[0041] In the process of preparing the ring - spun fancy yarn of the present invention, by feeding the head end of the fiber sliver into the range controlled by the frictional field of the middle roller and regulating the distance between its head end and the nip of the middle roller, the detail problem generated in the transition section during the alternate feeding of two rovings or the intermittent feeding of one roving in the prior art is effectively solved, and the empty distance caused by the stop of the back roller during intermittent feeding is avoided, thereby improving the quality and appearance quality of the ring - spun fancy yarn. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the spinning method of the ring - spun fancy yarn in Example A1;

[0043] Figure 2 It is a schematic diagram of the structure of the device used for preparing the ring - spun fancy yarn;

[0044] Figure 3 It is a schematic diagram of the structure of the lifting mechanism;

[0045] Figure 4 It is a schematic diagram of the movement of the intermittent - feeding back roller within a single cycle;

[0046] Among them, 1 - first roving, 2 - second roving, 3 - intermittent - feeding back roller, 4 - middle roller, 5 - lifting mechanism, 6 - controller, 51 - support rod, 52 - sliding sleeve, 53 - spring, 54 - pressure - applying arm, 55 - pressure - applying cylinder, 56 - connecting rod, 57 - top roller, 58 - bottom roller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0048] The following are the test methods for relevant performance indicators in each embodiment and comparative example:

[0049] Average length of the transition section: The average value is taken by randomly selecting 20 transition sections.

[0050] Number of details: The test is carried out with reference to the standard of GB / T 3292.1 - 2008.

[0051] The device used for preparing the ring - spun fancy yarn in each of the following embodiments, as Figures 2 to 3 shown, includes a ring - spinning frame, a top roller 57, a bottom roller 58, a controller 6, and a lifting mechanism 5;

[0052] As Figure 2As shown, the ring spinning frame includes an intermittently-fed back roller 3, a middle roller 4, and a front roller. Alternatively, the ring spinning frame further includes a continuously-fed back roller;

[0053] As Figure 3 shown, the central axes of the top roller 57 and the bottom roller 58 are both parallel to the left-right direction. The top roller 57 is located above the bottom roller 58, and both the top roller 57 and the bottom roller 58 are located between the intermittently-fed back roller 3 and the middle roller 4. The diameter of the intermittently-fed back roller 3 is 25 - 38 mm, the diameter of the middle roller 4 is 25 - 38 mm, the diameter of the front roller is 25 - 38 mm, the diameter of the bottom roller 58 is 6 - 8 mm, and the diameter of the top roller 57 is 6 - 8 mm. The middle of the top roller 57 is made of a metal material, and the surface layer is made of nitrile rubber;

[0054] The controller 6 controls the operation of the intermittently-fed back roller 3, the middle roller 4, the front roller, and the bottom roller 58, and at the same time adjusts the height of the top roller 57 through the lifting mechanism 5. When the height of the top roller 57 is at its minimum, the distance between the top roller 57 and the bottom roller 58 is 0. When the height of the top roller 57 is at its maximum, the vertical distance between the central axes of the top roller 57 and the bottom roller 58 is 18 - 22 mm;

[0055] The lifting mechanism 5 includes a pressure arm 54, a connecting rod 56, and a pressure cylinder 55. The pressure arm 54 is parallel to the left-right direction. Its non-end position is connected to the top roller 57 located below it through the connecting rod 56, and its middle position is connected to the pressure cylinder 55 located above it. The pressurizing direction of the pressure cylinder 55 is downward. A sliding sleeve 52 is provided at each of the left and right ends of the pressure arm 54. The two sliding sleeves 52 are respectively sleeved on the middle section of a vertically arranged support rod 51. A support seat is provided at the lower end of each of the two support rods 51. A spring 53 is sleeved on the lower section of each of the two support rods 51. On the same support rod 51, the spring 53 is clamped between the sliding sleeve 52 and the support seat. The stroke of the pressure cylinder 55 is 5 - 10 mm, and the thrust is 1000 - 1500 N. The spring 53 is a carbon steel spring, with a diameter of 40 - 45 mm, a wire diameter of 2 - 3 mm, 15 - 20 turns, a length of 80 - 120 mm, and an elastic coefficient of 200 - 250 N / mm;

[0056] When using this device to prepare ring-spun fancy yarn, the fiber sliver fed from the intermittently-fed back roller 3 is placed between the intermittently-fed back roller 3 and the middle roller 4. At this time, the top roller 57 is at its highest point and maintains a certain initial distance from the bottom roller 58;

[0057] Subsequently, the controller 6 starts the operation process of the intermittently-fed back roller 3, the middle roller 4 (continuously rotating forward, with a linear speed of v3), the front roller (continuously rotating forward, with a linear speed of v4), and the bottom roller 58. Among them, the intermittently-fed back roller 3 performs a periodic motion, such as Figure 4As shown in the figure, the starting time of a single cycle is denoted as t1, the ending time is denoted as t3, and there are 4 increasing moments between t1 and t3, which are respectively denoted as t2, ta, and tb. In the stage of [t1, t2), the intermittent feeding back roller 3 rotates forward at a linear speed of v1. In the stage of [t2, ta), the intermittent feeding back roller 3 does not rotate. In the stage of [ta, tb), the controller 6 controls the pressure cylinder 55 to apply downward pressure. The pressure cylinder 55 pushes the pressure arm 54 to move the upper roller 57 downward through the connecting rod 56 to cooperate with the lower roller 58, tightly holding a point on the roving in the back draft zone. At the same time, it controls the lower roller 58 and the intermittent feeding back roller 3 to rotate forward at the same linear speed v2. In the stage of [tb, t3), the lower roller 58 and the intermittent feeding back roller 3 stop rotating. At the moment of t3, the pressure cylinder 55 stops applying pressure, and the upper roller 57 gradually bounces up to the highest point under the elastic force of the spring 53, no longer holding the fiber sliver. The intermittent feeding back roller 3 enters the next periodic motion, rotates forward at a linear speed of v1, and continues to prepare the ring-spun fancy yarn.

[0058] Example A1

[0059] A method for preparing a ring-spun fancy yarn, the specific steps are as follows:

[0060] (1) Preparation of raw materials;

[0061] The first roving and the second roving: both are made of cotton, and the main body lengths are both 30 mm;

[0062] (2) Design of roving feeding method;

[0063] As Figure 1 shown, the first roving 1 is intermittently fed by the intermittent feeding back roller 3 of the device, and the second roving 2 is continuously fed by the middle roller 4 of the device;

[0064] (3) Start the device to prepare the ring-spun fancy yarn;

[0065] Among them, the relevant parameters of the device: the diameter of the intermittent feeding back roller is 25 mm; the diameter of the middle roller is 25 mm; the diameter of the front roller is 25 mm; the diameter of the lower roller is 6 mm; the diameter of the upper roller is 6 mm; when the height of the upper roller is the largest, the vertical distance between the central axes of the upper roller and the lower roller is 18 mm; the distance between the lower roller nip and the intermittent feeding back roller nip is 10 mm less than the main body length of the first roving; the distance between the lower roller nip and the middle roller nip is 15 mm less than the main body length of the first roving; the distance between the middle roller nip and the front roller nip is 35 mm;

[0066] Relevant process parameters: spindle speed is 12,000 r / min; spinning count is 21 English counts; twist is 550 twists / m; the first roving weight per unit length is 6 g / 10 m; the second roving weight per unit length is 6 g / 10 m; v1 is 0.8 m / min; v2 is 10 mm / s; v3 is 0.96 m / min; v4 is 21.8 m / min; the interval between t2 and t1 is 3 s; the interval between ta and t2 is 0.3 s; the interval between tb and ta is 0.2 s; the interval between t3 and tb is 0.1 s.

[0067] The finally obtained ring-spun fancy yarn is a ring-spun slub yarn, and the average length of the transition section is 3 mm.

[0068] Example A2

[0069] A preparation method of a ring-spun fancy yarn, the specific steps are as follows:

[0070] (1) Preparation of raw materials;

[0071] The first roving and the second roving: both are made of viscose, and the staple length is 38 mm;

[0072] (2) Design of roving feeding method;

[0073] The first roving is intermittently fed into the back roller by the intermittent feeding device, and the second roving is continuously fed into the middle roller by the device;

[0074] (3) Start the device to prepare the ring-spun fancy yarn;

[0075] Among them, the relevant parameters of the device: the diameter of the intermittent feeding back roller is 28 mm; the diameter of the middle roller is 28 mm; the diameter of the front roller is 28 mm; the diameter of the lower roller is 6 mm; the diameter of the upper roller is 6 mm; when the height of the upper roller is the largest, the vertical distance between the central axes of the upper roller and the lower roller is 20 mm; the distance between the lower roller nip and the intermittent feeding back roller nip is 8 mm less than the staple length of the first roving; the distance between the lower roller nip and the middle roller nip is 30 mm less than the staple length of the first roving; the distance between the middle roller nip and the front roller nip is 43 mm;

[0076] Relevant process parameters: spindle speed is 13,000 r / min; spinning count is 32 English counts; twist is 680 twists / m; the first roving weight per unit length is 5.5 g / 10 m; the second roving weight per unit length is 5.5 g / 10 m; v1 is 0.64 m / min; v2 is 15 mm / s; v3 is 0.83 m / min; v4 is 19.1 m / min; the interval between t2 and t1 is 5 s; the interval between ta and t2 is 0.4 s; the interval between tb and ta is 0.13 s; the interval between t3 and tb is 0.15 s.

[0077] The finally obtained ring-spun fancy yarn is a ring-spun section-colored yarn, with 2 details per km and the average length of the transition section being 4 mm.

[0078] Example A3

[0079] A preparation method of a ring-spun fancy yarn is as follows:

[0080] (1) Preparation of raw materials;

[0081] The first roving and the second roving: both are made of polyester and have a staple length of 55 mm;

[0082] (2) Design of the roving feeding method;

[0083] The first roving is intermittently fed into the back roller by the intermittent feeding device of the device, and the second roving is continuously fed into the middle roller by the device;

[0084] (3) Start the device to prepare the ring-spun fancy yarn;

[0085] Among them, the relevant parameters of the device: the diameter of the intermittently fed back roller is 38 mm; the diameter of the middle roller is 38 mm; the diameter of the front roller is 38 mm; the diameter of the lower roller is 8 mm; the diameter of the upper roller is 8 mm; when the height of the upper roller is the largest, the vertical distance between the central axes of the upper roller and the lower roller is 22 mm; the distance between the lower roller nip and the intermittently fed back roller nip is 15 mm less than the staple length of the first roving; the distance between the lower roller nip and the middle roller nip is 30 mm less than the staple length of the first roving; the distance between the middle roller nip and the front roller nip is 60 mm;

[0086] The relevant process parameters: the spindle speed is 15000 r / min; the spinning count is 40 English counts; the twist is 800 turns / m; the first roving has a weight per unit length of 5 g / 10 m; the second roving has a weight per unit length of 5 g / 10 m; v1 is 0.55 m / min; v2 is 20 mm / s; v3 is 0.8 m / min; v4 is 18.75 m / min; the interval between t2 and t1 is 8 s; the interval between ta and t2 is 0.5 s; the interval between tb and ta is 0.1 s; the interval between t3 and tb is 0.2 s.

[0087] The finally obtained ring-spun fancy yarn is a ring-spun section-colored yarn, with 1 detail per km and the average length of the transition section being 5 mm.

[0088] Comparative Example A1

[0089] A method for preparing a ring-spun fancy yarn is basically the same as that of Example A3, except that: the device used does not include an upper roller, a lower roller, and a lifting mechanism. Between time t2 and time t3, the intermittent feed rear roller always does not rotate and does not hold a point on the roving in the rear drafting zone and move forward.

[0090] The finally obtained ring-spun fancy yarn is a ring-spun section-colored yarn, with the number of details being 3.2 per km and the average length of the transition section being 9 mm.

[0091] Example B1

[0092] A method for preparing a ring-spun fancy yarn comprises the following specific steps:

[0093] (1) Preparation of raw materials;

[0094] The first roving and the second roving: both are made of cotton and have a main body length of 30 mm;

[0095] (2) Design of roving feeding method;

[0096] The first roving is intermittently fed by the intermittent feed rear roller of the device, and the second roving is continuously fed by the continuous feed rear roller of the device;

[0097] (3) Start the device to prepare the ring-spun fancy yarn;

[0098] Among them, the relevant parameters of the device: the diameter of the intermittent feed rear roller is 25 mm; the diameter of the continuous feed rear roller is 25 mm; the diameter of the middle roller is 25 mm; the diameter of the front roller is 25 mm; the diameter of the lower roller is 6 mm; the diameter of the upper roller is 6 mm; when the height of the upper roller is the largest, the vertical distance between the central axes of the upper roller and the lower roller is 18 mm; the distance between the lower roller nip and the intermittent feed rear roller nip is 10 mm less than the main body length of the first roving; the distance between the lower roller nip and the middle roller nip is 15 mm less than the main body length of the first roving; the distance between the continuous feed rear roller nip and the middle roller nip is 35 mm; the distance between the middle roller nip and the front roller nip is 35 mm;

[0099] The relevant process parameters: the spindle speed is 12000 r / min; the spinning count is 21 English counts; the twist is 550 turns / m; the first roving draft is 6 g / 10 m; the second roving draft is 6 g / 10 m; v1 is 0.8 m / min; v2 is 10 mm / s; v3 is 0.96 m / min; v4 is 21.8 m / min; the interval between time t2 and time t1 is 3 s; the interval between time ta and time t2 is 0.3 s; the interval between time tb and time ta is 0.2 s; the interval between time t3 and time tb is 0.1 s.

[0100] The finally obtained ring - spun fancy yarn is a ring - spun slub yarn, and the average length of the transition section is 3 mm.

[0101] Example B2

[0102] A preparation method of a ring - spun fancy yarn is as follows:

[0103] (1) Preparation of raw materials;

[0104] The first roving and the second roving: Both are made of viscose, and the staple length is 38 mm.

[0105] (2) Design of the roving feeding method;

[0106] The first roving is intermittently fed into the back roller by the intermittent feeding device of the device, and the second roving is continuously fed into the back roller by the continuous feeding device of the device.

[0107] (3) Start the device to prepare the ring - spun fancy yarn;

[0108] Among them, the relevant parameters of the device: The diameter of the intermittently fed back roller is 28 mm; the diameter of the continuously fed back roller is 28 mm; the diameter of the middle roller is 28 mm; the diameter of the front roller is 28 mm; the diameter of the lower roller is 6 mm; the diameter of the upper roller is 6 mm; when the height of the upper roller is the largest, the vertical distance between the central axes of the upper roller and the lower roller is 20 mm; the distance between the lower roller nip and the intermittently fed back roller nip is 8 mm less than the staple length of the first roving; the distance between the lower roller nip and the middle roller nip is 30 mm less than the staple length of the first roving; the distance between the continuously fed back roller nip and the middle roller nip is 45 mm; the distance between the middle roller nip and the front roller nip is 43 mm.

[0109] The relevant process parameters: The spindle speed is 13000 r / min; the spinning count is 32 English counts; the twist is 680 turns / m; the first roving draft is 5.5 g / 10 m; the second roving draft is 5.5 g / 10 m; v1 is 0.64 m / min; v2 is 15 mm / s; v3 is 0.83 m / min; v4 is 19.1 m / min; the interval between t2 and t1 is 5 s; the interval between ta and t2 is 0.4 s; the interval between tb and ta is 0.13 s; the interval between t3 and tb is 0.15 s.

[0110] The finally obtained ring - spun fancy yarn is a ring - spun section - colored yarn, the number of details is 2 per km, and the average length of the transition section is 4 mm.

[0111] Example B3

[0112] A preparation method of a ring - spun fancy yarn is as follows:

[0113] (1) Preparation of raw materials;

[0114] The first roving and the second roving: both are made of polyester, and the staple length is 55mm for both;

[0115] (2) Design of roving feeding method;

[0116] The first roving is intermittently fed into the back roller by the intermittent feeding device of the device, and the second roving is continuously fed into the back roller by the continuous feeding device of the device;

[0117] (3) Starting the device to prepare ring-spun fancy yarn;

[0118] Among them, the relevant parameters of the device: the diameter of the intermittently fed back roller is 38mm; the diameter of the continuously fed back roller is 38mm; the diameter of the middle roller is 38mm; the diameter of the front roller is 38mm; the diameter of the lower roller is 8mm; the diameter of the upper roller is 8mm; when the height of the upper roller is the maximum, the vertical distance between the central axes of the upper roller and the lower roller is 22mm; the distance between the lower roller nip and the intermittently fed back roller nip is 15mm less than the staple length of the first roving; the distance between the lower roller nip and the middle roller nip is 30mm less than the staple length of the first roving; the distance between the continuously fed back roller nip and the middle roller nip is 65mm; the distance between the middle roller nip and the front roller nip is 60mm;

[0119] Relevant process parameters: the spindle speed is 15000r / min; the spinning count is 40 English counts; the twist is 800 turns / m; the first roving count is 5g / 10m; the second roving count is 5g / 10m; v1 is 0.55m / min; v2 is 20mm / s; v3 is 0.8m / min; v4 is 18.75m / min; the interval between t2 and t1 is 8s; the interval between ta and t2 is 0.5s; the interval between tb and ta is 0.1s; the interval between t3 and tb is 0.2s.

[0120] The finally obtained ring-spun fancy yarn is ring-spun section-colored yarn, the number of details is 1 per km, and the average length of the transition section is 5mm.

[0121] Comparative example B1

[0122] A method for preparing ring-spun fancy yarn is basically the same as that of Example B3, except that: the device used does not include the upper roller, the lower roller, and the lifting mechanism, and between t2 and t3, the intermittently fed back roller does not rotate all the time, nor does it hold a point on the roving in the back draft zone and move forward.

[0123] The finally obtained ring-spun fancy yarn is ring-spun section-colored yarn, the number of details is 3 per km, and the average length of the transition section is 8mm.

Claims

1. A preparation device for ring spinning fancy yarn, comprising a ring spinning frame, the ring spinning frame including an intermittent feeding back roller, a middle roller, and a front roller, characterized in that, The device for preparing ring - spun fancy yarn further includes an upper roller, a lower roller, a controller, and a lifting mechanism; The central axes of the upper roller and the lower roller are both parallel to the left - right direction. The upper roller is located above the lower roller, and both the upper roller and the lower roller are located between the intermittently - feeding back roller and the middle roller; The controller controls the operation of the intermittently - feeding back roller, the middle roller, the front roller, and the lower roller. Meanwhile, it adjusts the height of the upper roller through the lifting mechanism. When the height of the upper roller is at its minimum, the distance between the upper roller and the lower roller is 0, and at this time, the roving in the back draft zone is held. When the height of the upper roller is at its maximum, the distance between the upper roller and the lower roller is greater than 0.

2. The preparation device of a ring spinning fancy yarn according to claim 1, characterized in that, The lifting mechanism includes a pressure - applying arm, a connecting rod, and a pressure - applying cylinder; The pressure - applying arm is parallel to the left - right direction. Its non - end position is connected to the upper roller below it through a connecting rod, and its middle position is connected to the pressure - applying cylinder above it. The pressure - applying direction of the pressure - applying cylinder is downward; A sliding sleeve is provided at each of the left and right ends of the pressure - applying arm. The two sliding sleeves are respectively sleeved on the middle section of a vertically - arranged support rod. A support seat is provided at the lower end of each of the two support rods. A spring is sleeved on each of the lower sections of the two support rods. On the same support rod, the spring is clamped between the sliding sleeve and the support seat.

3. The preparation device for a ring-spun fancy yarn according to claim 2, characterized in that, The stroke of the pressure - applying cylinder is 5 - 10 mm, and the thrust is 1000 - 1500 N.

4. The preparation device for a ring spinning fancy yarn according to claim 2, characterized in that, The spring is a carbon - steel spring, with a diameter of 40 - 45 mm, a wire diameter of 2 - 3 mm, 15 - 20 turns, a length of 80 - 120 mm, and an elastic coefficient of 200 - 250 N / mm.

5. The preparation device of a ring-spun fancy yarn according to claim 1, characterized in that, The diameter of the intermittently - feeding back roller is 25 - 38 mm, the diameter of the middle roller is 25 - 38 mm, the diameter of the front roller is 25 - 38 mm, the diameter of the lower roller is 6 - 8 mm, and the diameter of the upper roller is 6 - 8 mm.

6. The preparation device of a ring spinning fancy yarn according to claim 5, characterized in that, When the height of the upper roller is at its maximum, the vertical distance between the central axes of the upper roller and the lower roller is 18 - 22 mm.

7. The preparation device of a ring-spun fancy yarn according to claim 1, characterized in that, The middle part of the upper roller is made of metal material, and the surface layer is made of nitrile rubber.

8. The preparation device of a ring-spun fancy yarn according to claim 1, characterized in that, The ring - spinning frame further includes a continuously - feeding back roller.

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