Patent Publication Number: US-10781538-B2

Title: Yarn twisting device and continuous twisting method

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This is a 371 application of the International PCT application serial no. PCT/CN2017/094839, filed on Jul. 28, 2017, which claims the priority benefits of China Application No. 201610622001.9 filed on Jul. 29, 2016. The entirety of each of the above-mentioned patent applications is hereby incorporated by reference herein and made a part of this specification. 
     BACKGROUND 
     Technical Field 
     The present invention is related to the textile field, in particular to a yarn twisting device and continuous twisting method. 
     Description of Related Art 
     Twisting treatment is essential for cotton fabric weaved with cotton yarn. Twisting aims to fix two or more single yarns into plied yarns so as to obtain such quality status as better shaping and high strength. Two or more single yarns will be lack of cohesion without twisting, which may split under an external force to the extent of affecting the quality of finished products. 
     Twisting is an essential approach to fabricate fiber strip into yarns. A twisted silk yarn is also known as PP fiber or thrown silk, which in general aims to endow the filament with twist. The twisted silk yarn is applicable to knitting and weaving, covering whole of the textile field. The twisted silk yarn above 150 D (15D-50D for superfine denier) is relegated into coarse yarn, which is in the unit of twist/cm. People regard twisted silk yarn of 80-500 twists as weak twist, 500-1000 twists as medium twist, and over 1000 twists as strong twist. According to fabric style, twisting is available in single Z twist or s and z in direction S and Z. 
     Twisting has following functions: enhance the strength and friction of the silk yarn to minimize fuzz and broken ends, and improve fastness of fabrics; provide certain profiles and patterns for the silk yarn; endow the fabrics with such effect as refraction, crinkle or looped pile and knit; enhance the elasticity of silk yarn, and improve wrinkle resistance (imitation memory ironing-free fabrics) and permeability (strong twist yarn), and make the fabrics cool and comfortable. 
     Two-for-one twister is a conventional twisting device, which has such disadvantages as complicated structure, high price and excessive tension on the yarn during twisting. 
     SUMMARY 
     In view of defects of the prior arts, the present invention aims to provide a yarn twisting device featuring in simple structure, less twisting tension and continuous twisting of a single yarn and combined twisting of multiplied yarns. 
     Technical solutions provided by the present invention are stated as follows: 
     A yarn twisting device, including a frame and following components on the frame: 
     a hollow shaft, in which a passage is provided for a yarn passing therethrough; 
     a drive mechanism, configured to drive the hollow shaft for rotation; 
     a winding mechanism, driven by the hollow shaft for rotation in the same direction to wind and twist the yarn; and 
     a speed reducing mechanism for transmission coordination between the hollow shaft and the winding mechanism. 
     Preferably, A yarn twisting device including a frame and following components on the frame: 
     a hollow shaft, in which a passage is provided for a yarn passing therethrough; 
     a drive mechanism, configured to drive the hollow shaft for rotation at a first rotating speed; 
     a winding mechanism, driven by the hollow shaft for rotation in the same direction at a second rotating speed to wind and twist the yarn; and 
     a speed reducing mechanism for transmission coordination between the hollow shaft and winding mechanism to reduce the input first rotating speed to the output second rotating speed. 
     In the present invention, it is applicable to configure the first rotating speed corresponding to the hollow shaft and the second rotating speed of winding mechanism according to actual number of yarns to be twisted and a twist of the yarn. 
     In a preferred embodiment, a twisting arm synchronous with the hollow shaft and extended outside of the winding mechanism is provided. The hollow shaft passes through a center portion of the twisting arm. A yarn guide mechanism is provided on one side of the twisting arm. 
     In a preferred embodiment, a through-hole connected with the passage is provided on a side wall of the hollow shaft. The yarn penetrating through the through-hole enters the winding mechanism through the yarn guide mechanism. 
     In a preferred embodiment, the yarn guide mechanism comprises a guide pulley on an end portion of the twisting arm and a guide sleeve located between the guide pulley and the through-hole. 
     In a preferred embodiment, the end portion of the twisting arm is connected with a guide plate extended to outside of a periphery of the winding mechanism. The guide plate is provided with a guide hole. 
     In a preferred embodiment, the drive mechanism comprises a twisting motor and a transmission part for linkage with the twisting motor and the hollow shaft. 
     In a preferred embodiment, the winding mechanism is a bobbin. 
     In a preferred embodiment, one end of the hollow shaft extends into the bobbin. The speed reducing mechanism comprises a drive gear sleeved on the hollow shaft and at least one speed change gear set engaged with the drive gear and having an axle fixed in correspondence with the frame. A gear tooth engaged with the speed change gear set is provided on an inner wall of the bobbin. 
     According to the present invention, a speed reducing mechanism with planetary gear is used in priority, which can be provided with three change gear sets around the hollow shaft. 
     In a preferred embodiment, the axle of the change gear set is installed with a first magnetic part. A mounting seat fixed to the frame is provided with the second magnetic part fitting with the first magnetic part. 
     In the present invention, the magnetic part is a device with magnetic performance, such as magnet. An axle of a speed change gear inside the speed reducing mechanism of a planetary gear is fixed through suction between the first magnetic part and the second magnetic part to ensure rotation of the speed change gear during operation without revolution around the hollow shaft, and the rotation of the speed change gear will drive rotation of the bobbin. 
     In a preferred embodiment, at least one locating gear engaged with the gear tooth is provided inside the bobbin. A revolving shaft of the locating gear is also installed with a magnetic part. 
     The present invention further provides a method for continuous twisting of a yarn, comprising: 
     the yarn to be twisted penetrates an axial passage inside a hollow shaft; 
     driven by the drive mechanism, the yarn rotates at a first rotating speed inside the hollow shaft; and 
     the yarn being twisted is wound by a winding mechanism; the winding mechanism rotates in the same direction at a second rotating speed that is lower than the first rotating speed. 
     The present invention features in simple structure, less twisting tension, and continuous twisting of a single yarn and combined twisting of multiplied yarns. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a structural diagram for a twisting device according to the present invention; 
         FIG. 2  is a perspective diagram of the twisting device; 
         FIG. 3  is a sectional diagram taken along line A-A in  FIG. 2 ; 
         FIG. 4  is a structural diagram of a winding mechanism; and 
         FIG. 5  is an exploded diagram of the winding mechanism in  FIG. 4 . 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     The twisting device as shown in  FIG. 1  to  FIG. 3  comprises a frame, a hollow shaft  8  installed on the frame, a drive mechanism, a winding mechanism  4 , and a speed reducing mechanism. 
     A passage for a yarn to pass therethough is provided inside the hollow shaft  8 . An arrow B in  FIG. 3  refers to a movement direction of the yarn. A single yarn or multiplied yarns directly enter the hollow shaft  8 . 
     The drive mechanism comprises a twisting motor  2 . The twisting motor  2  is fixed to the frame by a fastener  1 . The twisting motor  2  drives the hollow motor shaft  8  to rotate at a first speed. 
     In this embodiment, a main shaft of the twisting motor  2  is as a same component with the hollow shaft  8 ; in other words, the main shaft of the twisting motor  2  and the hollow shaft  8  are coaxially arranged. Furthermore, the main shaft of the twisting motor  2  and the hollow shaft  8  can be provided on different axis to realize linkage between the twisting motor  2  and the hollow shaft  8  via a transmission part. The transmission part is, for example, a gear or a transmission belt, and so on. 
     A twisting arm  3  is provided at a center portion of the hollow shaft  8 . The hollow shaft  8  passes through the center portion of the twisting arm  3 . In this embodiment, the twisting arm  3  is fixed to the hollow shaft  8 . The twisting arm  3  is to be in synchronous rotation while the hollow shaft  8  is rotating. An arrow C in  FIG. 3  refers to a rotation direction of the twisting arm  3  and the hollow shaft  8 . 
     A yarn guide mechanism is provided on one side of the twisting arm  3 ; whereas a counterbalance  9  is installed on the other side of the twisting arm  3 , to keep both sides of the twisting arm  3  balanced during rotation. 
     A through-hole communicated with the passage thereof is further provided at the center portion of hollow shaft  8 . The yarn penetrating the through-hole enters the winding mechanism  4  through the yarn guide mechanism for winding of the yarn. 
     In this embodiment, the yarn guide mechanism comprises a guide pulley  11  on an end portion of the twisting arm  3  and a guide sleeve  10  located between the guide pulley  11  and the through-hole. To ensure adequate tension on the yarn, the yarn passing through the through-hole and the guide pulley  11  is bent, and an inclination angle of the yarn between the through-hole and the guide sleeve  10  is smaller than that of the yarn between the guide sleeve  10  and the guide pulley  11 . 
     In this embodiment, a guide plate  12  extended to outside of a periphery of the winding mechanism  4  is provided on the end portion of the twisting arm  3 . The guide plate  12  is provided with a guide hole  13 . The yarn passing through the guide pulley  11  enters the winding mechanism  4  from the guide hole  13  for winding of the yarn. 
     As shown in  FIG. 4  and  FIG. 5 , winding mechanism  4  is driven by the hollow shaft  8  for synchronous rotation at the second rotating speed to wind and twist the yarn. With the transmission coordination between the hollow shaft  8  and the winding mechanism  4 , the speed reducing mechanism is adapted to reduce the input first rotating speed to the output second rotating speed. 
     In this embodiment, the winding mechanism  4  comprises a bobbin  41 . The speed reducing mechanism belongs to a gear reducing assembly. The speed reducing mechanism comprises a drive gear  42  inside the hollow shaft  8  and at least one speed change gear set  43  engaged with the drive gear  42  and having an axle fixed in correspondence with the frame. A gear tooth  44  engaged with the speed change gear set is provided on an inner wall of the bobbin  41 . 
     One end of the hollow shaft  8  extends into the bobbin  41 , which aims to reduce the first rotating speed of the hollow shaft  8  to the second rotating speed driving the bobbin  41  through the transmission coordination of the drive gear  42 , the speed change gear set  43  and the gear tooth  44 , so as to enable the bobbin  41  rotating at the second rotating speed to continuously wind the yarns being twisted. Furthermore, the bobbin  41  is also available for release of the yarn being wound under tractions of other mechanisms according to practical demands so as to realize continuous twisting in a direction indicated by an arrow D in  FIG. 3 . 
     In this embodiment, as the bobbin  41  is always kept in a rotating state, and the speed change gear set  43  is located at the bobbin  41 , it is necessary to maintain a position of the speed change gear set  43  to realize gear transmission deceleration. For this reason, an axle of the speed change gear set  43  is installed with a first magnetic part  6 . A mounting seat  5  fixed on the frame is provided with a second magnetic part  7  fitting with the first magnetic part  6 . The first magnetic part  6  and the second magnetic part  7  are located on upper and lower sides of the twisting arm  3 , which aim to keep the position of the axle of the speed change gear set  43  through mutual suction. Moreover, a lateral side of the bobbin  41  is provided with a cover  46 . To better fix the first magnetic part  6 , a magnetic guide seat  48  is used to fix the first magnetic part  6 . 
     In this embodiment, the gear tooth  44  is provided on annular ring  47  that is fixed to the bobbin  41 , and an internal part of the bobbin  41  is hollow. To prevent the bobbin  41  from shaking, at least one positioning gear  45  engaged with the gear tooth  44  is provided inside the bobbin  41 . An end portion of a rotary shaft of the positioning gear  45  is also installed with a magnetic part that is fixed through magnetic suction. 
     What mentioned above are instances of preferred embodiments for the present invention, which are not intended to restrict the present invention; any alteration, equivalent substitution and improvement as made based on the spirit and principles of the present invention are to be under the protection of the present invention.