Texturing machine

Abstract: A draw texturing machine comprises a first heater (13) for heating a yarn (Y), a false twisting device (14) for imparting twists to the yarn (Y), and a cooling plate (15), disposed between the first heater (13) and the false twisting device (14), for cooling the yarn (Y) which has been heated by the first heater (13) and for inhibiting vibration of the yarn (Y) so as to allow the yarn (Y) running stably. The cooling plate (15) is provided with a yarn threading groove member having a bottom portion (15a) with which the yarn (Y) runs in contact and wall portions (15b, 15c) connected to the bottom portion (15a) to form a concave opened downwardly. The wall portions (15b, 15c) of the yarn threading groove member are provided with a plurality of holes (30a, 30b, 30c), respectively. The bottom portion (15a) of the yarn threading groove member is provided with no holes.

Description: The present invention relates to a texturing machine according to the preamble of claim 1 and known, for instance, from document US-A-4 905 468. More specifically, the present invention relates to a cooling plate disposed in a texturing machine or a draw texturing machine comprising a first heater for heating a yarn, a false twisting device for imparting twists to the yarn, and the cooling plate, disposed between the first heater and the false twisting device, for cooling the yarn which has been heated by the first heater and for inhibiting vibration of the yarn so as to allow the yarn running stably. A supply yarn supplied with a texturing machine or a draw texturing machine is generally applied with finish so as to enhance smooth withdrawal of a yarn from a supply package and its processing. Such finish applied to the yarn is heated in a first heater, and a part of the finish is evaporated to oily smoke which is then transferred by an air flow accompanying with the running yarn to the outlet of the first heater, where it is sucked into a suction pipe for sucking the oily smoke. Further, a part of the finish is converted to liquid oil which has a high temperature and a low viscosity and which adheres to filaments constituting the yarn. The liquid oil adhering to the filaments may be scattered as it moves with the running yarn and may be condensed at a deflecting guide disposed at the outlet of the heater or at the bottom of the cooling plate with which the yarn runs in contact. Thus, oil drops adhere to the yarn guides or the cooling plate. Especially, when the first heater and the cooling plate are so arranged that the yarn passage scarcely has very small deflection therebetween (see, for example, the arrangement of the first heater and the first cooling plate in U.S. Patent No. 4,905,468), the oily smoke and oil drops generated from finish in the first heater are directly transferred to the cooling plate, and thus, scattering, cooling and condensation of finish are caused at the bottom of the cooling plate as described above. In order to prevent scattering, cooling and condensation of finish from occurring, it may be recommended to dispose a cooling plate which has a groove with which a running yarn is in contact and a plurality of holes at the bottom of the groove so that oil drops adhering to a running yarn are discharged through the holes. However, if holes are formed at the yarn contacting portion of the groove with which a yarn runs in contact, there is a problem that the cooling ability of the plate is deteriorated since the contacting area between the yarn and the bottom of the groove is decreased due to the existence of the holes. Further, there is another problem that finish applied to the yarn is deposited at the corner of the holes which are formed at the bottom. In addition, the yarn running at the bottom of the groove of the cooling plate is rotated on the cooling plate due to twists imparted by a false twisting device, and thus, there is a further problem that filaments constituting the yarn which is rotating abut the corner of the holes formed at the bottom of the groove of the cooling plate and that the yarn quality is degraded due to the damage of the filaments by scratching at the corner. Taking the above-described disadvantages inherent to the conventional devices, it is an object of the present invention to provide a cooling plate of a texturing machine or a draw texturing machine by which the cooling ability of the cooling plate is good since the contacting area between the yarn and the bottom of the groove is not decreased. It is another object of the present invention to provide a cooling plate of a texturing machine or a draw texturing machine by which cleaning interval of the cooling plate can be elongated since finish applied to the yarn is not deposited at the corner of the holes. According to the present invention, the above-described objects are achieved by a texturing machine or a draw texturing machine comprising a first heater for heating a yarn, a false twisting device for imparting twists to the yarn, and a cooling plate, disposed between the first heater and the false twisting device, for cooling the yarn which has been heated by the first heater and for inhibiting vibration of the yarn so as to allow the yarn running stably, characterized in that the cooling plate is provided with a yarn threading groove member having a bottom portion with which the yarn runs in contact and wall portions connected to the bottom portion to form a concave opened downwardly, the wall portions of the yarn threading groove member are provided with a plurality of holes, respectively, and the bottom portion of the yarn threading groove member is provided with no holes. According to the present invention, both the wall portions of the yarn threading groove member of the cooling plate are provided with a plurality of holes while no holes are formed at the bottom portion of the groove member. Accordingly, the contacting area between the yarn and the bottom of the groove is not decreased, and consequently, the cooling ability of the cooling plate is not lowered. Since according to the present invention, there is no holes at the bottom portion of the groove member with which a yarn is in contact, finish applied to the yarn is not deposited at the corner of such holes. Further, the yarn quality is not degraded according to the present invention since the yarn is not scratched by such holes. Further, according to the present invention, both the wall portions are provided with a plurality of holes, finish scattered at the bottom portion of the cooling plate is discharged to the outside of the cooling plate through the holes. As a result, adhesion of the oil drops to the yarn threading groove member is decreased, and the interval for cleaning the adhered liquid oil can be long. The discharge of finish may be carried out by the spontaneous convection of air. However, ends of the wall portions of the cooling plate opposite to the bottom portion may be bent outwardly, respectively, and the ends may be connected to each other at a rear of the yarn threading groove member so as to form a suction chamber, and the suction chamber may be communicated with a suction means. Thus, finish separated from the yarn running through the yarn threading groove member may be actively sucked through the holes to the suction chamber. When a suction chamber which is actively sucked is formed, the cleaning interval of the cooling plate can be further elongated. When suction chamber is formed as described above, it is preferred that an outlet for discharging finish is disposed at a lower side of the suction chamber. The shape of the holes formed on the wall portions according to the present invention is not limited. However, it is preferred that the holes of the wall portions are elongated in a longitudinal direction of the cooling plate. Further, it is preferred that a plurality of elongated holes are disposed along an imaginary line directed in the longitudinal direction of the cooling plate. Further, it is preferred that a plurality of elongated holes are disposed along a plurality of imaginary lines directed in the longitudinal direction of the cooling plate and that ends of adjacent elongated holes in the plurality of lines are overlaid with each other in a direction along which gravity takes place. The present invention will now be explained in detail with reference to the accompanying drawings, wherein: Fig. 1 is an elevation grammatically showing a draw texturing machine according to the present invention; Fig. 2 is an enlarged elevation showing a cooling plate installed in the draw texturing machine in Fig. 1; Fig. 3 is a perspective view of a first embodiment of the cooling plate according to the present invention; Fig. 4 is a perspective view of a second embodiment of the cooling plate according to the present invention wherein the illustration of some parts are omitted; Fig. 5 is an enlarged elevation of another cooling plate according to the present invention; and Fig. 6 is a perspective view of the downstream portion of the cooling plate illustrated in Fig. 5. Preferred Embodiments Referring to Fig. 1 which is an elevation grammatically showing a draw texturing machine according to the present invention, a yarn Y, for example, made of a synthetic fiber, such as polyester or polyamide, is withdrawn from a supply package 18 supported on a creel 17 and is fed to a first heater 13 through yarn guides 25 and 26, first feed roller device 11 and a yarn guide 27. A first cooling plate 15 of the present invention is disposed downstream the first heater 13 (see Fig. 2), and a deflecting guide 28 and a second cooling plate 16 are disposed downstream the first cooling plate 15. A false twisting device 14 is disposed below the second cooling plate 16. The false twisting device is of a well known type, such as a device provided with equidistantly supported multiple spindles and multiple discs mounted on the spindles, or a rotary spindle with a twisting pin. A second feed roller device 12 is disposed beneath the false twisting device 14. A second heater 19 disposed below the second feed roller device 12 adjusts the bulk properties or stretch properties of the yarn Y. Reference numeral 20 denotes a third feed roller device. The yarn Y is guided from the third feed roller device 20 and passes under the threading aisle 22, and then through a guide 29, it reaches a take up 21 where it is wound into a yarn package. In the machine which has such a construction as described above, while the yarn Y withdrawn from the supply package 18 is drawn at a predetermined draw ratio between the first and second roller devices 11 and 12, twists are imparted to the yarn Y by the false twisting device 14 and run back along the yarn Y toward the first heater 13, where they are heat set. The twists may be imparted after the yarn Y is drawn at a predetermined draw ratio. Then, the twists set at the first heater 13 are cooled by means of the first cooling plate 15 and the second cooling plate 16 as the yarn Y moves, and they enter into the false twisting device 14, and then, the yarn Y is de-twisted as it leaves the false twisting device 14. An embodiment of the cooling plate 15 of the present invention is illustrated in Fig. 3. In this embodiment illustrated in Fig. 3, the cooling plate 15 is formed in a downwardly opened U-shape, and the yarn Y runs at the bottom portion 15a, which is illustrated at the top in Fig. 3, of the cooling plate 15, while the yarn Y is in contact with the bottom portion 15a. Another embodiment of the cooling plate 15 of the present invention is illustrated in Fig. 4. In order to simplify the illustration, a suction chamber 31 and a suction pipe 32 communicating with the suction chamber 31, which are illustrated in Fig. 3 and which will be explained later, are omitted from the embodiment of Fig. 4. The cooling plate 15 illustrated in Fig. 4 is formed in a downwardly opened V-shape. Similar to the embodiment illustrated in Fig. 3, the yarn Y runs at the bottom portion 15a, which is illustrated at the top in Fig. 4, of the cooling plate 15, while the yarn Y is in contact with the bottom portion 15a. As clearly illustrated in Figs. 3 and 4, the bottom portion 15a, where the yarn Y runs while it is in contact with, has no holes formed therein. Wall portions 15b and 15c are connected to the sides of the bottom portion 15a and extend outwardly from the bottom portion 15a. The wall portions 15b and 15c have elongated holes 30a and 30b formed therein and extending in a longitudinal direction of the cooling plate 15. The elongated holes 30a and 30b are formed along two imaginary lines a and b ( see Fig. 4) which extend in the longitudinal direction and which are in parallel with each other. The ends of the elongated holes 30a and 30b are overlaid with each other in a direction along which the gravity takes place. The portions overlaid in a direction along which the gravity takes place are denoted by hatching in Fig. 4. The lower ends of the wall portions 15b and 15c are bent outwardly, i.e., in a direction opposite to the bottom portion 15a to form bent portions 15d and 15e. As illustrated in Fig. 3, the ends of the wall portions 15b and 15c forming the bent portion 15d and 15e are further bent to surround the outside of the yarn threading groove member and are connected to each other to form a suction chamber 31. The suction chamber 31 is communicated with a suction means (not shown) through a suction pipe 32 as illustrated in Fig. 3. As described above, the suction chamber 31 and the pipe 32 communicated with the suction chamber 31 are omitted from Fig. 4. Although the illustration of a side plate disposed downstream the bent portion 15d and 15e is omitted from Figs. 3 and 4, in actual, the side plate is attached at the front end of Figs. 3 and 4. The side plate has discharge outlets 33 mounted thereon for recovering finish gathered in the suction chamber 31, so that the finish is recovered at the lower side of the suction chamber 31, i.e., at the downstream side of the suction chamber 31 in the illustrated embodiment. A still another embodiment is illustrated in Figs. 5 and 6. In this embodiment, the upstream side, i.e., the portion A near the first heater 13, of the cooling plate 15 has a construction similar to that of the embodiments illustrated in Figs. 3 and 4. More specifically, the cooling plate 15 at this region A has a yarn threading groove member formed in a downwardly opened U-shape or V shape. The yarn threading member comprises a bottom portion 15a, where a yarn Y runs while it is in contact with the bottom portion 15a, and wall portions 15b and 15c connected to the bottom portion 15a and extending from the bottom portion 15a. The wall portions 15b and 15c have holes 30a and 30b, while the bottom portion 15a is provided with no holes. The holes 30a and 30b are elongated and extending in a longitudinal direction of the cooling plate 15, and a plurality of elongated holes 30a and 30b are formed along a plurality of imaginary lines which extend in the longitudinal direction and which are in parallel with each other. The ends of the elongated holes 30a and 30b are overlaid with each other in a direction along which the gravity takes place. The lower ends of the wall portions 15b and 15c are bent outwardly, i.e., in a direction opposite to the bottom portion 15a to form bent portions 15d and 15e. The ends of the wall portions 15b and 15c forming the bent portion 15d and 15e are further bent to surround the outside of the yarn threading groove member and are connected to each other to form a suction chamber 31. The suction chamber 31 is communicated with a suction means, and discharge outlets 33 are communicated with the suction chamber 31. Contrary to this, the downstream side of the cooling plate 15, i.e., the portion B away from the first heater 13, has such a construction as illustrated in Fig. 6. More specifically, the cooling plate 15 at this region has a yarn threading groove member formed in a downwardly opened U-shape or V shape. The yarn threading member comprises a bottom portion 15a, where a yarn Y runs while it is in contact with the bottom portion 15a, and wall portions 15b and 15c connected to the bottom portion 15a and extending from the bottom portion 15a. The wall portions 15b and 15c have a plurality of circular holes 30c, while the bottom portion 15a is provided with no holes. The lower ends of the wall portions 15b and 15c are slightly bent outwardly, i.e., in a direction opposite to the bottom portion 15a, to form bent portions 15d and 15e, however, different from the embodiments illustrated in Figs. 3 and 4, the ends of the wall portions 15b and 15c are not connected to each other to form a suction chamber 31, and no suction chamber 31 is formed. The ends 15d and 15e of the wall portions 15b and 15c bent opposite to the bottom portion 15a is intended to reinforce the strength of the cooling plate 15. At the upstream portion of the cooling plate 15 in the embodiment illustrated in Figs. 5 and 6, the elongated holes are formed in the wall portions 15b and 15c and are oriented to a longitudinal direction of the cooling plate 15. At the same time, the suction chamber 31 is formed around the cooling plate 15. When the suction chamber 31 is actively sucked, generation of liquid oil and its adhesion to the cooling plate can be prevented or decreased. In addition, due to the above-described construction, the scattered liquid oil is sufficiently removed at the upstream side of the cooling plate 15, oily smoke, which may be generated by the rolling motion of the running yarn Y at the bottom portion 15a of the cooling plate 15 in the downstream side of the cooling plate 15, can be discharged to the outside through the plurality of holes 30c formed on the wall portions 15b and 15c by means of spontaneous convection of air. According to the present invention, while no holes are formed at the bottom portion of the yarn threading groove member, only the wall portions of the yarn threading groove member of the cooling plate are provided with a plurality of holes. Accordingly, the length of the yarn contacting with the bottom of the groove of the cooling plate is substantially the same as that when a cooling plate has no holes. Thus, the contacting length which determines the cooling temperature of the yarn or the restriction of the yarn vibration is unchanged from that of conventional one. Generation and adhesion of oil drops are remarkably decreased. The present invention is especially advantageous when the first heater and the cooling plate are aligned substantially in a line, i.e., so arranged that the yarn passage scarcely has very small deflection therebetween, wherein a serious problem of oily smoke accompanying with a running yarn may occur easily.

Claims: A texturing machine or a draw texturing machine comprises a first heater (13) for heating a yarn (Y), a false twisting device (14) for imparting twists to said yarn (Y), and a cooling plate (15), disposed between said first heater (13) and said false twisting device (14), for cooling said yarn (Y) which has been heated by said first heater (13) and for inhibiting vibration of said yarn (Y) so as to allow said yarn (Y) running stably, characterized in that said cooling plate (15) is provided with a yarn threading groove member having a bottom portion (15a) with which said yarn (Y) runs in contact and wall portions (15b, 15c) connected to said bottom portion (15a) to form a concave opened downwardly, said wall portions (15b, 15c) of said yarn threading groove member are provided with a plurality of holes (30a, 30b, 30c), respectively, and said bottom portion (15a) of said yarn threading groove member is provided with no holes. A machine according to claim 1, wherein said holes (30a, 30b) of said wall portions (15b, 15c) are elongated in a longitudinal direction of said cooling plate (15), a plurality of elongated holes (30a, 30b) are disposed along a plurality of imaginary lines (a, b) directed in said longitudinal direction of said cooling plate (15), and ends of adjacent elongated holes (30a, 30b, 30c) in said plurality of imaginary lines (a, b) are overlaid with each other in a direction along which gravity takes place. A machine according to claim 1 or 2, wherein ends (15d, 15e) of said wall portions (15b, 15c) opposite to said bottom portion (15a) are bent outwardly, respectively, said ends (15d, 15e) are connected to each other at a rear of said yarn threading groove member so as to form a suction chamber (31), and said suction chamber (31) is communicated with a suction means. A machine according to claim 3, wherein an outlet (33) for discharging finish removed from said yarn (Y) is disposed at a lower side of said suction chamber (31).

Inventors: NAITO SHUNZO, YAMAMOTO SHIGERU, NAITO, SHUNZO, YAMAMOTO, SHIGERU, NAITO, SHUNZO, C/O TEIJIN SEIKI CO., LTD., Yamamoto, Shigeru, c/o Teijin Seiki Co., Ltd.
Applicants: TEIJIN SEIKI CO LTD, TEIJIN SEIKI CO. LTD.
Application year: 1993
Main classification: D02J13
IPC codes: D02G1, D02J13