阅读说明：本技术 一种螺纹整束及尖端加捻的纺纱方法及纺纱装置 (Spinning method and spinning device for thread whole bundle and tip twisting ) 是由 徐卫林 许多 刘可帅 范航 杨旺旺 郭维琪 于 2020-12-30 设计创作，主要内容包括：本发明涉及一种螺纹整束及尖端加捻的纺纱方法及纺纱装置,本发明采用在旋转胶辊装置上压持第一集聚装置和第二集聚装置,利用其集聚槽轮表面螺纹齿峰刺入输入的散纤维、分束纤维,同时左右分设的右旋螺纹和左旋螺纹推动散纤维分别依次向中部的集聚槽和U型槽进行集聚,U型槽内高速旋转的尖端加捻装置表面摩擦带动下集束后的纤维发生扭转纠缠,纤维排列形成倾斜、相互之间捻合纠缠,在捻合尖端形成具有捻合强力的集束纤维,在输出辊装置牵伸后收集在卷绕装置上,实现了散纤维利用螺纹轴向推进形成集束,再通过高速旋转的摩擦使集束纤维直接捻合成型形成纱线；本发明纺纱效率高,大幅缩短前纺工序,操作简单,利于推广。(The invention relates to a spinning method and a spinning device for thread whole bundle and tip twisting, which adopts a first gathering device and a second gathering device which are pressed and held on a rotary rubber roll device, utilizes the thread tooth crest on the surface of a gathering sheave thereof to pierce input loose fibers and split fibers, meanwhile, the left-handed thread and the right-handed thread which are respectively arranged on the left and the right push the loose fibers to be respectively gathered to the gathering groove and the U-shaped groove in the middle part in sequence, the fibers gathered under the driving of the surface friction of the tip twisting device rotating at high speed in the U-shaped groove are twisted and entangled, the fibers are arranged to form inclination and mutual twisting and entanglement, bundling fibers with twisting strength are formed at the twisting tip end, and are collected on a winding device after being drafted by an output roller device, so that the loose fibers are axially pushed by threads to form bundling, and then the bundling fibers are directly twisted and formed into yarns through high-speed rotation friction; the invention has high spinning efficiency, greatly shortens the fore-spinning process, has simple operation and is beneficial to popularization.)

1. A spinning method of thread full-bunching and tip twisting is characterized in that the spinning method comprises the following steps: the loose fibers are split firstly, the split loose fibers are gradually drawn close to the middle position from two sides to form a cluster fiber strip, then the cluster fiber parallel arrangement structure which is similar to the steel needle-shaped tip surface friction is utilized to drive the cluster fibers to be gathered to change, the tangential group force generated by friction enables the cluster fibers which are straightly arranged to be twisted and inclined, meanwhile, the friction and torsion action inside and outside the fibers are different to generate cohesion between the fibers, and a yarn structure with twisting strength is formed.

2. A spinning apparatus for carrying out a thread-bundling and tip-twisting spinning method according to claim 1, characterized in that the spinning apparatus comprises:

the rotary rubber roll device comprises a rotary rubber roll with a cavity inside and a plurality of air holes arranged on the surface of the rotary rubber roll, and the air holes are communicated with the cavity;

the negative pressure box is communicated with the air hole through a negative pressure pipeline;

the motor device is connected with the rotary rubber roll and is used for driving the rotary rubber roll to rotate;

a first gathering device;

the first gathering device and the second gathering device are sequentially arranged on the surface of the rotary rubber roll in parallel along the yarn conveying direction, and are respectively pressed and matched with the rotary rubber roll to form a first gathering jaw and a second gathering jaw for yarn output; the first gathering device and the second gathering device both comprise gathering grooved wheels, a supporting shaft and a bearing, the gathering grooved wheels are rotatably mounted on the supporting shaft through the bearing, each gathering grooved wheel comprises a thread area positioned in the middle and pressing areas positioned on two sides of the thread area, each thread area comprises a left-handed thread and a right-handed thread which are symmetrically arranged relatively, the height of a pressing platform in each pressing area is consistent with the height of a thread tooth peak of each thread area, a group of gathering thread grooves are further formed in the middle of each gathering grooved wheel on the first gathering device in the circumferential direction, and a group of U-shaped grooves are further formed in the middle of each gathering grooved wheel on the second gathering device in the circumferential direction;

the tip twisting device is arranged above the middle position of the second gathering jaw and comprises a twisting tip, a connecting shaft stem and a high-speed motor, the twisting tip is connected with the high-speed motor through the connecting shaft stem, the twisting tip is of a tip structure similar to a steel needle shape, and the twisting tip vertically extends into the U-shaped groove;

and a winding device.

3. A spinning apparatus with complete thread bundle and tip twist as claimed in claim 2, wherein the central axis of the tip twist device forms an angle of 85-95 ° with the connecting line of the central points of the second gathering device and the rotary glue roller device.

4. The spinning device of claim 2, wherein the first and second collecting jaws are spaced apart from each other by 15-50 mm.

5. The spinning device of claim 2, wherein the rotation speed of the tip twisting device is 10000r/min to 200000r/min, the surface friction coefficient of the twist tip is 0.1 to 0.5, and the widest part of the twist tip has a diameter of 1 to 3 mm.

6. The spinning device for thread bunching and tip twisting according to claim 2, wherein the groove depth of the gathering groove in the middle of the first gathering sheave is 0.3mm to 1mm, the groove width is 0.3mm to 1mm, the groove depth of the U-shaped groove in the middle of the second gathering sheave is 3mm to 6mm, and the groove width is 3mm to 6 mm.

7. A spinning device with complete thread bundle and tip twist according to claim 2, characterized in that the linear speed of the rotating rubber roller device is 30-100 m/min.

Technical Field

The invention relates to the technical field of spinning, in particular to a spinning method and a spinning device for thread bundling and tip twisting.

Background

The ring spinning technology belongs to holding end spinning, in the ring spinning process, when a yarn is wound on a bobbin, a steel wire ring is driven to rotate around a steel collar to twist a sliver, in the traditional ring spinning twisting process, the twist is generated by the movement of the steel wire ring, and the twist is transmitted to a twisting point from bottom to top after being generated. The ring spinning technology is widely applied due to strong adaptability of raw materials, wide range of production varieties and high quality of finished yarns, but has the defects of low spinning efficiency, complex production process, high quality control difficulty, high requirement on pre-spinning quality and the like.

The novel spinning is a new spinning technology which is different from the traditional ring spinning, and the rotor spinning technology and the vortex spinning technology are produced according to the fatal problems that the ring spinning speed is limited by a spun yarn package and the spinning speed is lower. Compared with the traditional ring spinning technology, the rotor spinning and vortex spinning technology comprises the following steps: the method has the advantages of short spinning process, high production efficiency, labor saving, low processing cost and the like, so the method is developed rapidly.

The rotor spinning technology belongs to the free end spinning, and the spinning principle is that cotton slivers are fed into a cotton conveying roller through a cotton feeding roller, and fibers are carded into a single fiber state which is arranged in parallel; the fibers arranged in parallel enter the rotating cup through the fiber conveying channel, are conveyed to the inner wall of the conical surface of the rotating cup and slide into the condensing groove of the rotating cup; the twisting of the yarn is completed by rotating the inclined other end of the yarn around the yarn or the axis of the rotor, and the rotating twisting of the yarn enables the fibers in the coagulation groove of the rotor to be held together; the twisted yarn is led out through a yarn-drawing tube and is wound into a cone yarn through a yarn guide and winding device. Compared with ring spinning, the rotor spinning has the advantages that the rapid, short-flow and automatic spinning of fiber strips is realized. However, the rotor spinning technique is inferior to ring spinning in the development of high-quality, ultra-high count yarns.

The air-jet vortex spinning technology is a technology for twisting and wrapping yarn cores by using free tail end fibers which are laid down at the inlet of a hollow spindle in a twisting cavity through high-speed rotating airflow to form yarn. The technology adopts compressed air to generate high-speed rotating airflow, has the characteristic of high twisting efficiency, realizes the separation of twisting and winding processes, overcomes the defect of solid piece rotating twisting, and can spin at high speed. And in the yarn forming process, the fiber head end leaves the jaw of the front roller and then forms a head end free end fiber under the action of negative pressure at the inlet of the twisting cavity, the fiber slides into the yarn tail core part at the inlet of the hollow spindle along the guide of the guide needle, the fiber which is continuously fed meets the moving yarn tail and is condensed onto the yarn tail, and the yarn strip is continuously twisted to form yarn. However, there are certain challenges to the yarn forming process: the method has the advantages of improving the parallel straightness of the strands and the fibrillation of the strands, reducing the cotton doffing rate, enhancing the self-twisting and internal and external transfer effects of the free tail end fibers, and strictly controlling weak twisting, and is the key for developing high-quality air-jet vortex yarns.

Although the novel spinning technologies overcome the problems of low efficiency and difficulty in realizing large packages of ring spinning, the spinning is still required to be carried out through the fiber strands, the spinning process is not shortened obviously, and meanwhile, the spinning is carried out through the high-quality fiber strands, so that the requirements on the previous spinning process are high, and the revolutionary breakthrough of direct spinning of loose fibers is difficult to realize.

Disclosure of Invention

In view of the above problems, it is an object of the present invention to provide a spinning method and a spinning apparatus for thread bunching and tip twisting, which allow bulk fibers to be axially pushed by a thread to form a bunch, and then the bunch fibers are directly twisted by friction of high-speed rotation to form a yarn.

In order to achieve the purpose, the technical solution of the invention is as follows:

a spinning method of thread bundling and tip twisting comprises the following steps: the loose fibers are split firstly, the split loose fibers are gradually drawn close to the middle position from two sides to form a cluster fiber strip, then the cluster fiber parallel arrangement structure which is similar to the steel needle-shaped tip surface friction is utilized to drive the cluster fibers to be gathered to change, the tangential group force generated by friction enables the cluster fibers which are straightly arranged to be twisted and inclined, meanwhile, the friction and torsion action inside and outside the fibers are different to generate cohesion between the fibers, and a yarn structure with twisting strength is formed.

Meanwhile, the invention also provides a spinning device for realizing the spinning method of thread bundling and tip twisting, which comprises the following steps:

the rotary rubber roll device comprises a rotary rubber roll with a cavity inside and a plurality of air holes arranged on the surface of the rotary rubber roll, and the air holes are communicated with the cavity;

the negative pressure box is communicated with the air hole through a negative pressure pipeline;

the motor device is connected with the rotary rubber roll and is used for driving the rotary rubber roll to rotate;

a first gathering device;

the first gathering device and the second gathering device are sequentially arranged on the surface of the rotary rubber roll in parallel along the yarn conveying direction, and are respectively pressed and matched with the rotary rubber roll to form a first gathering jaw and a second gathering jaw for yarn output; the first gathering device and the second gathering device both comprise gathering grooved wheels, a supporting shaft and a bearing, the gathering grooved wheels are rotatably mounted on the supporting shaft through the bearing, each gathering grooved wheel comprises a thread area positioned in the middle and pressing areas positioned on two sides of the thread area, each thread area comprises a left-handed thread and a right-handed thread which are symmetrically arranged relatively, the height of a pressing platform in each pressing area is consistent with the height of a thread tooth peak of each thread area, a group of gathering thread grooves are further formed in the middle of each gathering grooved wheel on the first gathering device in the circumferential direction, and a group of U-shaped grooves are further formed in the middle of each gathering grooved wheel on the second gathering device in the circumferential direction;

the tip twisting device is arranged above the middle position of the second gathering jaw and comprises a twisting tip, a connecting shaft stem and a high-speed motor, the twisting tip is connected with the high-speed motor through the connecting shaft stem, the twisting tip is of a tip structure similar to a steel needle shape, and the twisting tip vertically extends into the U-shaped groove;

and a winding device.

Furthermore, the central axis of the tip twisting device forms an included angle of 85-95 degrees with the connecting line of the central points of the second gathering device and the rotary rubber roll device.

Furthermore, the first collecting jaw and the second collecting jaw are 15-50 mm apart.

Furthermore, the rotating speed of the tip twisting device is 10000 r/min-200000 r/min, the surface friction coefficient of the twisted tip is 0.1-0.5, and the diameter of the widest part of the twisted tip is 1-3 mm.

Furthermore, the groove depth of the gathering groove in the middle of the first gathering grooved wheel is 0.3mm-1mm, the groove width is 0.3mm-1mm, the groove depth of the U-shaped groove in the middle of the second gathering grooved wheel is 3mm-6mm, and the groove width is 3mm-6 mm.

Further, the linear speed of the rotary rubber roll device is 30-100 m/min.

Due to the adoption of the technical scheme, compared with the prior art, the spinning method of the thread whole bundle and the tip twisting has the advantages that:

the method is characterized in that a first gathering device and a second gathering device are pressed on a rotary rubber roll device and arranged in parallel front and back and are composed of gathering grooved wheels, supporting shafts and bearings, the screw thread peaks on the surfaces of the gathering grooved wheels are utilized to pierce input loose fibers and split fibers, meanwhile, right-handed threads and left-handed threads which are respectively arranged on the left and right push gathering grooves in the middle of the loose fibers to gather to form gathered fibers, the gathered fibers are transferred into a second gathering under the action of negative pressure of a gathering area, and then the right-handed threads and the left-handed threads push U-shaped grooves in the middle of the gathered fibers to gather, so that the technical problem that the fibers can be spun after being formed into roving fiber strands through multiple pre-spinning processes is solved; the method comprises the following steps that fibers collected after being driven by the surface friction of a tip twisting device rotating at a high speed in a U-shaped groove are twisted and entangled, so that the structure of parallel arrangement of the collected fibers is changed, the tangential acting force generated by the friction enables the collected fibers arranged straightly to be twisted and inclined, and the stress difference of the internal and external friction and twisting action of the fibers generates cohesion among the fibers, so that the fibers are arranged to be inclined and twisted and entangled with each other to form the collected fibers with twisting strength, and the collected fibers are collected on a winding device after being drafted by an output roller device, thereby overcoming the technical problems of complexity and high energy consumption of various novel spinning technical mechanisms; the bulk fibers are axially pushed by the threads to form bunches, and then the bunched fibers are directly twisted and formed into yarns through high-speed rotation friction. The invention has the advantages of convenient operation, no additional energy consumption, simple and clear mechanism and easy popularization and use.

Drawings

FIG. 1 is a schematic view of a spinning process with thread finishing and tip twisting.

FIG. 2 is a schematic view of the structure of a rotary rubber roll device.

Fig. 3 is a schematic view of a first coalescing assembly.

Fig. 4 is a schematic view of a second nesting device.

Fig. 5 is a schematic view of the structure of the tip twisting device.

In the figure: 1-rotating rubber roll device, 2-first gathering device, 3-second gathering device, 4-tip twisting device, 5-motor device, 6-negative pressure device, 7-loose fiber, 8-output roll device, 9-yarn, 10-winding device, 11-cavity, 12-air hole, 13-negative pressure pipeline, 15-gathering grooved wheel, 16-supporting shaft, 17-bearing, 18-thread area, 19-pressing area, 20-thread crest, 21-pressing platform, 22-right-handed thread, 23-left-handed thread, 24-gathering groove, 25-U-shaped groove, 26-high-speed motor, 27-connecting shaft stem and 28-twisting tip.

Detailed Description

The present invention is described in further detail below with reference to the attached drawing figures.

The embodiment aims at the technical problems of low spinning efficiency, difficulty in large package, poor adaptability of raw materials for rotor spinning and vortex spinning, high spinning energy consumption and complex mechanism of the traditional ring spinning, and further provides a spinning method and a spinning device for thread bundling and tip twisting, which realize that bulk fibers are axially pushed by threads to form bundled yarns, and then the bundled fibers are directly twisted and formed into yarns through high-speed rotating friction.

Firstly, the invention provides a spinning method of thread whole bundle and tip twisting, which comprises the following steps: the loose fibers are split firstly, the split loose fibers are gradually drawn close to the middle position from two sides to form a cluster fiber strip, then the cluster fiber parallel arrangement structure which is similar to the steel needle-shaped tip surface friction is utilized to drive the cluster fibers to be gathered to change, the tangential group force generated by friction enables the cluster fibers which are straightly arranged to be twisted and inclined, meanwhile, the friction and torsion action inside and outside the fibers are different to generate cohesion between the fibers, and a yarn structure with twisting strength is formed.

Referring to the attached drawings 1 to 5, the invention also provides a spinning device for realizing the spinning method of thread bundling and tip twisting, which comprises a rotary rubber roll device 1, a first gathering device 2, a second gathering device 3 and a tip twisting device 4, wherein the interior of the rotary rubber roll device is a cavity 11, the surface of the rotary rubber roll device is provided with a circle of air holes 12, the air holes 12 penetrate through the surface of the rotary rubber roll device and are connected to the cavity 11 inside the rotary rubber roll device, one end of the axial direction of the rotary rubber roll device is provided with a negative pressure pipeline 13, one end of the negative pressure pipeline 13 is connected with the cavity 11 inside the rotary rubber roll device 1, the other end of the axial direction of the rotary rubber roll device 1 is externally connected with a negative pressure device 6, the other end of the axial direction of the rotary rubber roll device 1 is additionally provided with a motor device 14, the first gathering device 2 and the second gathering device 3 press the surface, the first gathering device 2 and the second gathering device 3 are arranged in a front-back and parallel symmetrical mode, the first gathering device 2 is meshed with the rotary rubber roll device 1 to form a first gathering jaw, the second gathering device 3 is meshed with the rotary rubber roll device 1 to form a second gathering jaw, the distance between the first gathering jaw and the second gathering jaw is 15-50 mm, the first gathering device and the second gathering device are respectively composed of a gathering sheave 15, a supporting shaft 16 and a bearing 17, the gathering sheave 15 is installed on the supporting shaft 16 through the bearing 17, the outer diameter of the first gathering sheave and the outer diameter of the second gathering sheave are 6-12 mm, the inner diameter of the first gathering sheave and the inner diameter of the second gathering sheave are 4-10 mm, a thread area 18 and a pressing area 19 are respectively arranged on the surface of the gathering sheave 15, the pressing area 19 is arranged at two ends of the thread area 18, the height of a pressing platform 21 in the pressing area 19 is consistent with the height of a crest 20 of the thread area 18, right-handed thread 22 and a left-, the thread angle of the thread area on the surfaces of the first gathering grooved wheel 2 and the second gathering grooved wheel 3 is 30-60 degrees, the smaller the thread pitch width is, the larger the thread groove depth is, the larger the contact holding force to the loose fibers is, the easier the whole bundle control to the fibers is, the thread pitch is 0.3-1.5 mm, the thread groove depth is 0.3-3 mm, the tooth crest and the groove bottom of the thread area both adopt the circular arc with the chamfer angle of 0.1-0.15 mm, the middle part of the gathering grooved wheel 15 of the first gathering device 2 is provided with a group of gathering thread grooves 24 along the circumferential direction, the depth of the gathering thread grooves is 0.3-1 mm, the groove width is 0.3-1 mm, both ends are connected with a right-handed thread 22 and a left-handed thread 23, the middle part of the gathering grooved wheel 15 of the second gathering device 3 is provided with a group of U-shaped grooves 25 along the circumferential direction, the groove depth of the U-shaped grooves is 3-6 mm, and the groove, the U-shaped groove is vertical to the central axis of the grooved wheel, a tip twisting device 4 is additionally arranged in the middle of a second gathering jaw formed by the engagement of a second gathering device 3 and a rotary rubber roll device 1, the rotating speed of the tip twisting device is 10000 r/min-200000 r/min, the tip twisting device comprises a twisting tip 28, a connecting shaft stem 27 and a high-speed motor 26, one end of the connecting shaft stem 27 is connected with the twisting tip 28, the other end is connected with the high-speed motor 26, the twisting tip 28 of the tip twisting device 4 is similar to a steel needle shape and is arranged in a U-shaped groove 25 in the middle of a grooved wheel 15 of the second gathering device 3 along a direction perpendicular to the central axis of the second gathering device 3, the surface friction coefficient of the twisting tip is 0.1-0.5, the diameter of the widest part is 1-3 mm, the twisting tip 28 is close to the bottom of the U-shaped groove 25, and an included angle of 85-95 degrees is formed between the central axis of the tip twisting device 4 and the connecting line of the central points of the second gathering device 3 and the rotary rubber roll device 1;

during spinning, the rotating rubber roll device 1 drives the first gathering device 2 and the second gathering device 3 to rotate, the linear speed of the rotating rubber roll device is 30-100 m/min, the bulk fibers 5 which are arranged in parallel are fed into the first gathering jaw, the bulk fibers 7 are penetrated through a tooth peak 20 on a first sheave on the first gathering device 2, the bulk fibers 7 are pushed to a gathering groove 24 in the middle of the first gathering sheave 15 through a right-handed thread 22 and a left-handed thread 23 which are symmetrical on the surface of the first gathering sheave 15, the bulk fibers 7 form a bundle under the action of thread pushing, the bundle fibers output from the first gathering jaw enter a gathering area formed by air holes 12 on the surface of the rotating rubber roll device 1, the bundle fibers are gathered under the negative pressure of the gathering area to keep the bundle fibers to be transferred in a strip shape and not scattered and are attached to the surface of the rotating rubber roll device 1 under the negative pressure, so that the bundle fibers are driven to be transferred under, the transferred bundled fibers enter a second gathering jaw, the bundled fibers are pushed into a U-shaped groove 25 in the middle of the second gathering sheave 15 through a right-handed thread 22 and a left-handed thread 23 which are symmetrical on the surface of the second gathering sheave 15, so that the bundled fibers are gathered in the U-shaped groove 25, a twisting tip arranged in the U-shaped groove 25 is driven by a connecting shaft rod to rotate at a high speed under the drive of a high-speed motor, the bundled fibers in the U-shaped groove 25 and a second gathering device 3 form an encircling arc, when the parallel fibers continuously gathered in the U-shaped groove 25 contact the twisting tip 28 rotating at a high speed, the parallel bundled fibers are twisted and entangled under the drive of the surface friction of the twisting tip 28, the fibers are arranged to form inclined and mutually twisted and entangled, the bundled fibers with twisting strength are formed on the surface of the twisting tip, and the entangled bundled fibers are pulled in the axial parallel direction of the twisting tip 28 by an output roller device 8 arranged at the front end of the second gathering jaw, the twisted and entangled bundled fibers are axially drawn towards the most tip of the twisted tip 28, the bundled fibers are drafted through the linear velocity difference between the output roller device 8 and the rotary rubber roller device 1, the tail fibers of the drawn continuous bundled fibers are still twisted and entangled under the driving of the surface friction rotation of the twisted tip 28, the middle parts of the bundled fibers are tightly twisted and cohered under the transmission of the centrifugal twisting force and the twisting force of the tail fiber twisting and cohering force, so that the twisted and entangled fibers on the surface of the twisted tip are peeled and dragged to form continuous yarns 9, meanwhile, the fibers pushed into the gathering U-shaped groove 25 are again entangled into yarns to form a balanced state of fiber gathering-twisted and yarn-drafting and stripping, and the formed yarns 9 are finally collected by the winding device 10.

The specific embodiment is as follows:

in the embodiment, the cotton yarn is spun by the spinning method of the invention, pure cotton loose fibers which are arranged in parallel and straight after carding are spun into cotton yarn by a spinning process of thread bundling and tip twisting, a rotating rubber roll device drives a first gathering device and a second gathering device to synchronously rotate at a linear speed of 50m/min, a gathering sheave of the first gathering device has the inner diameter of 6mm, the outer diameter of 12mm, the thread pitch of 0.5mm and the thread groove depth of 1mm, the gathering groove depth of the middle part of the first gathering sheave is 1.5mm, the groove width is 1mm, a gathering sheave of the second gathering device has the inner diameter of 4mm and the outer diameter of 8mm, the thread pitch of 0.5mm and the thread groove depth of 2mm, the groove depth of a U-shaped groove of the middle part of the second gathering sheave is 4mm and the groove width is 3mm, the pure cotton loose fibers sequentially pass through the first gathering device and the second gathering device which are arranged in a front-back and back manner and are arranged on the surface, the first gathering device and the second gathering device form a gathered cotton fiber strip under the action of screw pushing gathering, the gathered cotton fiber strip is driven to twist and wrap under the high-speed rotation of tip twisting 20000r/min, and meanwhile, the output roller device performs drafting transfer at the speed of 80m/min, so that final finished yarns are collected on the winding device. Therefore, the invention obviously improves the production efficiency of spinning. The technical method is simple, effectively shortens the spinning process, reduces a series of pre-spinning processes, has low manufacturing cost and is suitable for popularization and application in the textile industry.

In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.

The features of the embodiments and embodiments described herein above may be combined with each other without conflict.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.