A BOBBIN COVER PLATE USED IN TWISTER

Abstract: The present invention is related to a circular shaped bobbin cover plate used in twister characterized in that: a yarn guide groove (1a) which guides the yarn in yarn feeding bobbin (B) to upper direction of the bobbin cover plate (1) is installed in the center part of the circular plate, a yarn guide supporter (1b) having punched yarn guide (1c) which feed the yarn in the center of guide roller (2) is installed in lower part of the circular plate which is located at right front position of guide roller (2) during operation, and a fixed part (1d) which can fix the bobbin cover plate (1) to the body of guide roller (2) is installed in upper side of the circular plate. The said bobbin cover plate (1) is installed at the right upper part of yarn feeding bobbin (B) standing upright, improves the ratio of full drum by preventing chewing phenomenon and other problems caused by the unwinding inferiority of said bobbin (B).

Description: A BOBBIN COVER PLATE USED IN TWISTER TECHNICAL FIELD The present invention is related to a bobbin cover plate used in twister. More particularly, the present invention is related to a bobbin cover plate used in twister, wherein twisting 2 strings of polyester yarns together used for rubber reinforcing tire cord, for solving several problems caused by unwinding inferiority of yarn feeding bobbin(B) and improving ratio of full drum. BACKGROUND ART The tire cord for rubber reinforcement is weaved with 2 strings of equally twisted yarn of high modules low shrinkage polyester as its warp and covering yarn of high modules low shrinkage polyester covered by cotton yarn as its weft. Saurer Twister of Allma Co. has been primarily used for the preparation of the said warp of tire cord. As for the said former twister, as shown in Figure 1 , twist 1 string of polyester yarn fed from yarn feeding bobbin(A) and another 1 string of polyester yarn fed from yarn feeding bobbin(B) standing upright position to the said bobbin(A) in cord regulator(4), then winding at winding bobbin(C) by passing through capstan(5). The 1 string of polyester yarn fed from the bobbin(B) standing upright reaches to cord regulator(4) passing through inner yarn tensioner(3) by guide roller(2). There is high possibility for yarn in bobbin(B) to slip down under bobbin during unwinding (hereinafter called "Slip Phenomenon") since the yarn feeding bobbin(B) is standing upright. Also, in the process of preparing yarn feeding bobbin(B), it is obliged to have minor winding tension difference during the winding yarn in bobbin(B), and there could be fine hairs on yarn winded in bobbin(B). In the former twister, lots of unwinding inferiority happen during the unwinding of yarn from yarn feeding bobbin(B) to guide roller(2) due to the said reasons such as Slip Phenomenon, winding tension difference, and fine hairs in yarn. Thus, there are several problems in the former twister that over-feeding of yarn or jumping phenomenon of yarn to upward (hereinafter called "jumping phenomenon") due to the said unwinding inferiority. As a result, the yarn is frequently squeezed and chewed between guide roller(hereinafter called "chewing phenomenon"), or winded around inner yarn tensioner(3). In this case, the twister stops automatically since higher tension(±10%) comparing to the setting value is loaded to the self adjusting sensor. Accordingly, the ratio of full drum of the former twister is in low level at 90—92% in general. The more rotation speed(rpm) of twister, the more happening of these serious phenomena. Because of these reasons, it is serious problem for the former twister to drop down the ratio of full drum remarkably if the twister is operated over than 7,500rpm. The object of present invention is to provide a bobbin cover plate(l) which can resolve the aforesaid problems caused by unwinding inferiority during the process of high speed unwinding of yarn from yarn feeding bobbin(B). In addition, the object of present invention is to improve the productivity(rotation speed) and ratio of full drum of the twister. DISCLOSURE OF INVENTION The present invention is related to a bobbin cover plate used in twister. More particularly, the present invention is related to a bobbin cover plate used in twister, wherein twisting 2 strings of polyester yarns used for rubber reinforcing tire cord, for solving several problems caused by unwinding inferiority of yarn feeding bobbin(B) and improving ratio of full drum. The present invention is to provide a bobbin cover plated ) which can resolve the problems caused by unwinding inferiority during the process of high speed unwinding of yarn from yarn feeding bobbin(B). In the present invention, particularly, bobbin cover plated ) used in twister is installed in right upward angle to the yarn feeding bobbin(B) as shown in Figure 2. From this installation, it is possible to prevent the chewing phenomenon, or winded around inner yarn tensioner(3) by precluding the yarn over-feeding even in a high speed twisting. The bobbin cover plate, shaped in circular plate, used in twister characterized in that • a yarn guide grooved a) which guides the yarn in yarn feeding bobbin(B) to upper direction of the bobbin cover plated ) is installed in the center part of the circular plate, a yarn guide supporter(lb) having punched yarn guided c) which feed the yarn in the center of guide roller(2) is installed in lower part of the circular plate which is located at right front position of guide roller(2) during operation, and a fixed part(ld) which can fix the bobbin cover plate(l) to the body of guide roller(2) is installed in upper side of the circular plate. Detail illustration on the present invention is followed hereinafter. First of all, the bobbin cover plate used in twister of the present invention is round circular plate as shown in Figure 3. The favorable diameter of the circular bobbin cover plate(l) is 85~95% of the diameter of yarn feeding bobbin(B) in full-drum condition. If the diameter of the bobbin cover plate(l) is too large, the operation shall be inconvenient. If it is too small, it is not possible to effectively protect the jumping phenomenon and chewing phenomenon caused by unwinding inferiority. A yarn guide grooved a) which guides the yarn in yarn feeding bobbin(B) to upper direction of bobbin cover plate(l) is installed in the center part of the circular plate. In the rim of the said yarn guide grooved a), ceramic protection is prepared in order to prevent any fine hairs in the yarn. In the meantime, a yarn guide supporter(lb) having punched yarn guide(lc) which feed the yarn in the center of guide roller(2) is installed in lower part of the circular plate which is located at right front position of guide roller(2) during operation. The said yarn guide supporter(lb) shaped ^- as shown in Figure 3. The angle of θ in Figure 3 is 50-70°. More preferably, the angle of θ is 60°. Occasionally, the yarn guide supporterdb) may have shape. If the angle of θ is not within the aforesaid range, the yarn fed from yarn feeding bobbin(B) may not be fed precisely to the exact center of guide roller(2). The height(center basis) of yarn guide(lc) installed in the yarn guide supporter(lb) should be set up as same as that of guide roller(2). If the height of yarn guide(lc) is set up wrong, fine hairs may come into exist due to the touch of yarn with the rim of yarn guide( lc). In the meantime, a fixed part(ld) which can fix the bobbin cover plate(l) to the body of guide roller(2) is installed in upper side of the circular plate. By bolting the hole of said fixed part(ld), fix the bobbin cover plate(l) to the lower part of guide roller body. For the material of bobbin cover plate(l) in the present invention, plastic such as acryl may be used, considering impact strength, in particular, polycarbonate is favorable, and anti-static treated polycarbonate is more favorable. Additionally, it is more favorable to prepare bobbin cover plated ) with transparent plastic resin that the operation status of yarn could be observed during twisting process. It is more favorable to treat the rim of the circular plate roundly for the prevention of any damage(fine hairs etc.) to yarn. From figure 2, detail illustration on the twisting process for rubber reinforcing yarn by using the bobbin cover plated ) of the present invention is followed hereinafter. The bobbin cover plated ) of the present invention is fixed at the lower part of guide roller(2) so as to the bobbin cover plate locates at the right upward angle to yarn feeding bobbin(B). One string of yarn fed from yarn feeding bobbin(A) installed in certain inclination angle, is feed to cord regulator(4) through magnetic brake, and another one string of yarn fed from yarn feeding bobbin(B) standing upright is feed to cord regulator(4) through the bobbin cover plate(l) of the present invention. In this case, the yarn fed from yarn feeding bobbin(B) standing upright comes up to the upper part of bobbin cover plated ) through yarn guide grooved a) of the present invention, and is feed to the center part of guide roller(2) through the hole of yarn guided c) installed in yarn guide supporterdb). The said guide roller(2) guide yarn before the yarn comes up to inner yarn tensioner(3), and provides certain tension with yarn. In addition, the said inner yarn tensioner(3) substantially provides yarn come up from yarn feeding bobbin(B) with tension before it reaches to cord regulator(4). It is favorable to provide yarn with 1, 340— 1 , 350g/d of tension in the said inner yarn tensioner(3). If the yarn is twisted without having proper tension, the twisting shall be unequal. When the twist gets unequal, the length difference of yarn(hereinafter called "LD value"), measuring each of the length of yarn after untwisting the twisted yarn, gets bigger and the property of tire cord gets deteriorated. The lower LD value the better it is, but up to 5mm of LD value is permitted. 2 strings of yarn fed to cord regulator(4) respectively are twisted together in cord regulator. The cord regulator(4) aggregate and twist the fed 2 strings of yarn by its self-rotation movement. In case the bobbin cover plate of the present invention is installed, it is possible to get high ratio of full drum even more than 9,000rpm of cord regulator(4). Twisted yarn from cord regulator(4) is winded at winding bobbin(C) passing through capstan(5) and etc. The circular shaped bobbin cover plated ) of the present invention protects the over-feeding of yarn from yarn feeding bobbin(B) to guide roller(2) and jumping phenomenon of yarn caused by unwinding inferiority. As a result, it is possible to prevent chewing phenomenon of yarn in guide roller(2) and unequal tanglement of yarn in inner yarn tensioner(3). Accordingly, when the circular shaped bobbin cover plate(l) of the present invention is used, the ratio of full drum of the twister shall be improved over than 99% since the jumping phenomenon and chewing phenomenon caused by unwinding inferiority of yarn feeding bobbin(B) could be prevented. BRIEF DESCRIPTION OF DRAWINGS Figure 1 is a rough-drawing of former twisting process. Figure 2 is a rough-drawing of twisting process of the present invention. Figure 3 is a plane drawing of bobbin cover plate(No. 1 in Figure 1) of the present invention Figure 4 is an enlarged-drawing of inner yarn tensioner(3) in Figure 1. ^ Legend for the main part of Figures A, B : Yarn feeding bobbin C • Winding bobbin 1 : Bobbin cover plate 2 : Guide roller 3 '■ Iinner yarn tensionerGnternal tension controller of yarn) 4 : Cord regulator(twist providing device) 5 • Capstan la • Yarn guide groove lb • Yarn guide supporter lc • Yarn guide Id • Fixed part BEST MODE FOR CARRYING OUT THE INVENTION More concretely, the present invention shall be examined through following examples and comparative examples. The present invention, however, is not limited only to following experimental examples. Example 1 Twist 2 strings of 1,500 denier polyester yarn at 9,000rpm of twisting speed and l,340g/d of twisting tension with Saurer Twister of Allma Co. (see Figure 2) wherein the bobbin cover plate(l) of the present invention is installed at right upward angle to yarn feeding bobbin(B) as shown in Figure 3. The said bobbin cover plate(l) is made of acryl resin and the diameter is 200mm. Also, the θ angle of yarn guide supporter(lb) is 65°, and the diameter of yarn guide groove (la) is 10mm. The turn number of yarn in inner yarn tensioner(3) is set up at 5 times. Table 2 is the experiment result on ratio of full drum, LD value and waste ratio. Example 2 - Example 3 Except the change of specification and material of bobbin cover plate(l), twisting speed, and twisting tension as shown in Table 1 , twist 2 strings of 1,500 denier polyester yarn as same process and condition of example 1. Table 2 is the experiment result on ratio of full drum, LD value and waste ratio. [Table 1 ] Preparing condition Comparative Example 1 Twist 2 strings of 1,500 denier polyester yarn at 6,500rpm of twisting speed and l,340g/d of twisting tension with usual Saurer Twister of Allma Co. (see Figure 1) wherein the bobbin cover plate(l) of the present invention is NOT installed. Table 2 is the experiment result on ratio of full drum, LD value and waste ratio. [Table 2] Experiment Result INDUSTRIAL APPLICABILITY The present invention prevents the over-feeding and jumping phenomenon of yarn caused by unwinding inferiority of yarn feeding bobbin(B). As a result, it is possible to improve the twister's ratio of full drum over than 99% since the chewing phenomenon or rolling phenomenon is remarkably decreased even the rotation speed of twister is elevated. In addition, the productivity is improved since the rotation speed of twister could be elevated until lO.OOOrpm.

Claims: WHAT IS CLAIMED IS 1. A bobbin cover plate, shaped in circular plate, used in twister characterized in that • a yarn guide groove( la) which guides the yarn in yarn feeding bobbin(B) to upper direction of the bobbin cover plate( l ) is installed in the center part of the circular plate, a yarn guide supporter( lb) having punched yarn guide( lc) which feed the yarn in the center of guide roller(2) is installed in lower part of the circular plate which is located at right front position of guide roller(2) during operation, and a fixed part( ld) which can fix the bobbin cover plate( l) to the body of guide roller(2) is installed in upper side of the circular plate. 2. The bobbin cover plate used in twister as claimed in claim 1 , wherein the yarn guide supporter( lb) has z shape. 3. The bobbin cover plate used in twister as claimed in claim 1 , wherein the diameter of the circular shaped bobbin cover plate(l ) is 85~95% of the diameter of yarn feeding bobbin(B) in full-drum condition. .3 4. The bobbin cover plate used in twister as claimed in claim 1 , wherein the θ angle of yarn guide supporter( lb) is 50-70° 5. The bobbin cover plate used in twister as claimed in claim 1 , wherein the height(center basis) of yarn guided c) is as same as that of guide roller(2). 6. The bobbin cover plate used in twister as claimed in claim 1 , wherein the material of bobbin cover plate( l) is anti-static treated polycarbonate resin. 7. The bobbin cover plate used in twister as claimed in claim 1 , wherein the outside rim of bobbin cover plate(l) is rounding processed. 8. The bobbin cover plate used in twister as claimed in claim 1 , wherein the material of yarn guide groove( la) is ceramic.

Inventors: PARK HAN YONG, SHIN JONG CHUL, WOO DONG PYO, PARK, HAN, YONG, SHIN, JONG, CHUL, WOO, DONG, PYO
Applicants: KOLON INC, PARK HAN YONG, SHIN JONG CHUL, WOO DONG PYO, KOLON INDUSTRIES, INC., PARK, HAN, YONG, SHIN, JONG, CHUL, WOO, DONG, PYO
Application year: 2001
Main classification: D01H7
IPC codes: D01H1, D01H7, D01H13, D02G3