Abstract: A yarn breakage position detecting device and method of detecting a yarn breakage position involves a running yarn tension detector arranged at a reference position and that outputs a tension signal by which occurrence of yarn breakage is detected, and passage of the end of a broken yarn through the reference position is then calculated based on the time period from occurrence of yarn breakage to passage of the broken yarn end through the reference position. The yarn breakage time is stored as a time at which the tension signal becomes a peak value and/or a time at which the tension signal begins to decrease below a steady state tension value. The time when the yarn passes through the reference position is stored as a time at which the tension signal becomes lower than a lower limit value and/or a time at which natural oscillation begins.

Abstract: A yarn feeding device including a preheater 23 for preheating a yarn bar Y, a first feed roller 27 for drawing the yarn bar Y from an original yarn package 11 is provided opposite to a temporary twisting and relaxation heat treating device including a second feed roller having a higher circumferential speed than that of the first feed roller 27, a temporary twisting tool 31 for twisting the yarn bar Y and a second heater 35 for carrying out a relaxation heat treatment on the temporary twisted yarn bar Y with a worker passage A interposed therebetween, a first heater 41 and a cooling plate which thermally fix a twist retroacting along the yarn bar Y are provided in portions positioned above from the yarn feeding device to the temporary twisting and relaxation heat treating device, and a winding device 51 including an automatic switching device is provided on an opposite worker passage A side of the temporary twisting and relaxation heat treating device.

Abstract: Yarn breakage position detecting method and device. The device includes a tension detector arranged at a reference position, to monitor tension of a running yarn, so that from a tension signal output by the tension detector, occurrence of yarn breakage is first detected and passage of the end of a broken yarn through the reference position is then detected. The yarn breakage position is calculated based on the time period from occurrence of yarn breakage to passage of the broken yarn end through the reference position. The time when the yarn is broken is stored as a time at which the tension signal becomes a peak value and/or a time at which the tension signal begins to decrease below a steady state tension value. The time when the yarn passes through the reference position is stored as a time at which the tension signal becomes lower than a lower limit value and/or a time at which natural oscillation begins.

Abstract: An apparatus and method for threading a yarn onto a draw texturing machine comprising a main frame (20) provided with twisting devices (5) and second heaters (13) and a winding frame (22) provided with winding devices (10) are disposed sandwiching an operator's aisle (21) therebetween. A yarn (Y) leaving the second heater is guided along the operator's aisle to the winding device mounted on the winding frame. The second heater (13) has a yarn threading slit (13a) formed therein, and a guiding pipe (34) having a spiral cross section and yarn disengaging slit (34a) formed therein is disposed adjacent to the yarn threading slit (13a). Along the operator's aisle (21), an extendable yarn guide pipe (41) and a fourth movable yarn feed roller device (7) are disposed. A yarn feed tube (51) provided with a yarn feed nozzle (51a) is disposed between the extended end of the yarn guide pipe (41) and the winding device (10).

Abstract: In a relaxation-heating method and an apparatus therefor, relaxation-heating is performed by a heating apparatus which is provided between a yarn supply roller (5) and a take-up roller (7) having a speed lower than that of the supply roller (5) and which is constituted by a heating roller (6a) and an auxiliary bobbin (6b). In the relaxation-heating method and an apparatus therefor, the size is compact, the heat conductivity is high and yarn can be made to run at a high speed.

Abstract: In a relaxation-heating method and an apparatus therefor, relaxation-heating is performed by a heating apparatus which is provided between a yarn supply roller (5) and a take-up roller (7) having a speed lower than that of the supply roller (5) and which is constituted by a heating roller (6a) and an auxiliary bobbin (6b). In the relaxation-heating method and an apparatus therefor, the size is compact, the heat conductivity is high and yarn can be made to run at a high speed.

Abstract: A yarn feeding device including a preheater 23 for preheating a yarn bar Y, a first feed roller 27 for drawing the yarn bar Y from an original yarn package 11 is provided opposite to a temporary twisting and relaxation heat treating device including a second feed roller having a higher circumferential speed than that of the first feed roller 27, a temporary twisting tool 31 for twisting the yarn bar Y and a second heater 35 for carrying out a relaxation heat treatment on the temporary twisted yarn bar Y with a worker passage A interposed therebetween, a first heater 41 and a cooling plate which thermally fix a twist retroacting along the yarn bar Y are provided in portions positioned above from the yarn feeding device to the temporary twisting and relaxation heat treating device, and a winding device 51 including an automatic switching device is provided on an opposite worker passage A side of the temporary twisting and relaxation heat treating device.

Abstract: A method for rethreading a yarn during false twist texturing of the yarn includes setting the temperature of a heater body outside a range having upper and lower limits so that if melted yarn adheres to the heater, the yarn vaporizes quickly if the temperature is above the upper limit or is easily removed by rethreading the yarn if the temperature is below the lower limit. The heater body has a total length between 0.8 and 1.2 m, the heater body and heating member divided into two pieces from upstream side to downstream side of the heat treating apparatus in ratio of length between 1:3 and 1: 1:5. The divided upstream heating member (12) is able to heat the upstream heater body (11) at a temperature higher than 370.degree. C., and the downstream heating member (22) is to heat the downstream heater body (21) at a temperature of between 200.degree. and 320.degree. C. or higher than 370.degree. C.

Abstract: A heater body has a total length between 0.8 and 1.2 m, the heater body and heating member are divided into two pieces from upstream side to downstream side of the heat treating apparatus in ratio of length between 1:3 and 1:1.5, the divided upstream heating member (12) is able to heat the upstream heater body (11) at a temperature higher than 370.degree. C., and the downstream heating member (22) is to heat the downstream heater body (21) at a temperature of between 200.degree. and 320.degree. C. or higher than 370.degree. C., the upstream heater body has yarn guides (15) disposed at a longitudinal pitch of at most 30 mm, and the downstream heater body has yarn guides (24) disposed at a longitudinal pitch between 80 and 120 mm.

Abstract: A draw texturing machine comprises 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 to run in a stable manner. 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, downwardly directed opening. The wall portions of the yarn threading groove member are provided with a plurality of holes, and the bottom portion of the yarn threading groove member is provided with no holes.

Abstract: An apparatus for heat treating a synthetic yarn comprises a heater body for completely or partially encircling the synthetic yarn, which is being false twisted or being drawn and false twisted, in a non-contacting condition therewith, a heating member disposed in the heater body for heating the heating wall of the heater body at a high temperature, and yarn guides disposed in a yarn passage surrounded by the heating wall of the heater body. In a first embodiment, the heater body and the heating member are longitudinally divided into at least two sections. In a second embodiment, the yarn guides are provided with yarn guide heating members which are different from the heating member for the heater body.

Abstract: In an automatic bobbin changing apparatus of a winding machine having a plurality of work stations disposed along the lengthwise direction of a machine frame, each winding portion of work station is provided with: a yarn treating device including a yarn sucking device (21), a yarn lifting guide (22), a yarn cutting device (24), a yarn gathering arm (61) and yarn threading arm (63) a cradle turning device including a cradle (13) and a cradle turning motor (31); an empty bobbin donning device including an empty bobbin arm (51); and a package receiver (83), and disposed in the winding machine is a control member for operating the yarn treating device, the cradle turning device, the empty bobbin donning device and the package receiver when at least one of packages at the winding portions reaches a state where it is to be changed.

Abstract: An apparatus for heat treating a synthetic yarn comprises a heater body for completely or partially encircling the synthetic yarn, which is being false twisted or being drawn and false twisted, in a condition non-contacting therewith, a heating member disposed in the heater body for heating the heating wall of the heater body at a high temperature, and yarn guides disposed in a yarn passage surrounded by the heating wall of the heater body. In a first embodiment, the heater body and the heating member are longitudinally divided into at least two sections. In a second embodiment, the yarn guides are provided with yarn guide heating members which are different from the heating member for heater body.

Abstract: A false twisting apparatus comprising: a pair of first feed rollers for feeding a yarn to be false twisted; a pair of second feed rollers for feeding a false-twisted yarn; a first heating means and a twisting means whcih are provided between the first and second feed rollers in order to false twist the yarn fed by the first feed rollers; wherein first and second stabilizing means for cooling and stabilizing the yarn heated by the first heating means are arranged between the first heating means and the twisting means in the recited order; the first stabilizing means being arranged substantially aligned with the first heating means; an interior angle defined between the first and second stabilizing means and inside the apparatus being more than 90.degree.; and the length of the second stabilizing means being shorter than that of the first stabilizing means.

Abstract: Respective leading and trailing end portions of two multi-filament yarns are joined together by disposing the leading and trailing end portions of the two multi-filament yarns in longitudinally contacting conditions, clamping the end portions of the multi-filament yarns at two points which are located at a predetermined distance from each other, drawing and slackening the end portions of the yarns between the two points, and blowing air under pressure toward the end portions of the yarns so that a jet stream of air impinges at a predetermined angle upon the end portions of the yarns over a predetermined length of the end portions between the two points for causing the end portions of the yarns to disintegrate into filaments over the aforesaid predetermined length and causing the filaments to entwine on one another.