JPS5924211B2 - False twisting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of continuously performing false twisting using a processing machine equipped with false twisting means.

Recently, processing machines equipped with a friction-type false-twisting means (particularly a circumscribed friction-type false-twisting means) have been used in the process of false-twisting synthetic fiber yarns such as polyamide and polyester in order to speed up the processing. It's becoming like that. In addition, in the false twisting process using a processing machine equipped with a conventional spindle-type false twisting means, in order to ensure continuous processing, the lower opening yarn of the supply system package being processed and the supply system package to be processed next to the package are There is a method (generally referred to as the "tail transfer method") in which false twisting can be performed continuously without interrupting the processing even when the supply system package is changed by knotting the top threads in advance. It has been adopted.

However, when such a tail transfer method is adopted, a knot is created between the lower opening thread of the supply system package being processed and the upper opening thread of the supply system package to be processed next.
When the wire runs in contact with the false twisting means, the winding property changes when the pin passes near the knot portion, and the processing tension fluctuates. For this reason, there is a problem in that the crimpability of the obtained false twisted yarn decreases near the knot portion, and striations occur. When such a tail transfer method is adopted in the false twisting method using the above-mentioned friction type false twisting means, the winding property changes greatly due to a change in the yarn diameter near the knot part, and the processing tension changes greatly. However, a much more serious problem occurs than when using a conventional spindle-type false twisting means, and the resulting false-twisted yarn has poor crimpability in the vicinity of the knot, resulting in the occurrence of striations.

In order to avoid this problem, each time the supply system package is switched, the operation of the processing machine is stopped and processing is temporarily interrupted, and then the processing machine is operated at low speed until the knot part has completely passed, and the yarn near the knot part is removed by an appropriate method. After wrapping or removing the belt, normal operation is resumed and processing is resumed.

However, with this method, it is necessary to interrupt processing at each knot, which reduces productivity and increases the amount of waste yarn.
At present, the effectiveness of high-speed processing using friction-type false twisting means has been halved. As a result of intensive research to solve this drawback, the present inventors have discovered that false twisting can be performed continuously without interrupting the processing at each knot, and that the non-uniform strings near the knot can be completely removed. The present invention has reached the fifth point, which can be removed and reduces the amount of waste threads.

That is, the present invention provides means for applying false twist without interrupting processing when switching packages by knotting in advance the lower opening yarn of the supply system package being processed and the upper opening yarn of the supply system package to be processed next. When false twisting is carried out continuously using a processing machine equipped with the above-mentioned 3. This method is characterized in that the false-twisted yarn is wound outside the normal traverse area for a certain period of time before and after the knot portion passes through the false-twist imparting means.

Hereinafter, the present invention will be explained with reference to the drawings. FIG. 1 is a schematic side view of a false twisting machine showing one embodiment of the present invention, and FIG. 2 is a front view of the winding machine in FIG. 1.

In the figure, 1a and 1b are supply system packages wound around bobbins 3a and 3b, respectively. 2a, 2b are knot parts, 4
, 4/ is a yarn take-out guide, 5 is a feed roller, and 6 is a friction type false twisting means. Three friction disks 6a are each attached to three rotating shafts 6b located at the vertices of a triangle, and the friction disks are partially attached. The polymers cross each other and are arranged along a spiral.

7 is a heater, 8 is a delivery roller, 9 is a yarn guide, 1
A winding machine 0 has a traverse guide 11 for traversing the yarn, a friction roller 12 for frictionally driving the bobbin, and a bobbin holder 13 for mounting the bobbin.

Reference numeral 14 indicates a bobbin, and 15 indicates a false twisted yarn package.

Further, as shown in FIG. 2, a waist spool 17 is rotatably supported at one end of a bobbin holder 13 on which a bobbin 14 is attached via a bearing 16. The waist spool 17 is connected to the drive shaft 20 through the pulley 8 and the drive bell opening 9.
is connected to. The drive shaft 20 is connected to a drive source (not shown). Reference numeral 21 denotes a moving guide, which is moved in the bobbin axis direction by an air cylinder (not shown) or the like, and removes the yarn Y, which is reciprocating in the normal traverse area by the traverse guide 11, from the traverse guide 11 and moves it to the waist spool 17. Move to the position.

A means 30 for detecting the amount of yarn remaining in the raw yarn package is provided near the supply system package 1a.

The detection means 30 for detecting the amount of yarn remaining in the yarn package is provided in the vicinity of the yarn package 1a (according to experiments conducted by the inventors, it is preferable to be several degrees below the surface of the yarn package 1a in a fully wound state). It is composed of a light emitting element 31 and a light receiving element 32. Here, the optical axes of the light-emitting element 31 and the light-receiving element 32 are arranged so that the light beam emitted from the light-emitting element 31 enters the light-receiving element 32 by reflection when the amount of remaining yarn in the yarn package 1a is reduced. They are arranged in the axial direction toward the axis of the yarn package 1a (they may be arranged in a direction perpendicular to the axial direction of the yarn package 1a). Further, a cylindrical hollow hood (not shown) is provided in front of the light emitting element 31 and the light receiving element 32 in order to reduce the influence of ambient light. Further, the light-emitting element 31 is supplied with pulsed power (approximately 1 KHz with a peak value of 5 in the embodiment) from the power supply, and the output signal of the light-receiving element 32 is sent to a signal processing circuit that is supplied with power from the power supply. It is being sent. The operation of the signal processing circuit will be described later. Furthermore, bobbin 3
The surfaces of a and 3b are entirely or partially colored, for example, black (this coloring is based on the light reflectance between the surface composed only of threads and the surface of the paper constituting the thread tube). (This is not necessarily necessary if the values are significantly different.) When the amount of yarn remaining in the yarn package 1a becomes extremely small (as shown in FIG. 1), the surface of the bobbin 3a is exposed from the mesh of the wound yarn. Through this state, there is no remaining yarn in the raw yarn package 1a, and
The yarn package 1b is connected continuously by the knot 2a.
begins to unravel. Therefore, by detecting the state in which the surface of the bobbin 3a is exposed from the above-mentioned loop of the thread being wound, it is possible to estimate the time when the knot 2a is supplied to the processing section.

That is, it is possible to estimate the point in time at which defective yarns that are processed non-uniformly occur based on the knots 2a. Here, to explain the detection operation of the above-mentioned state, normally, the pulsed light emitted from the light-emitting element 31 is reflected by the surface of the yarn package 1a that is made up only of threads, and the light-emitting element 32 as reflected pulsed light. The incident light pulse is transmitted by the light receiving element 32 to the signal processing circuit as an electrical detection pulse signal. Next, as described above, when the surface of the bobbin 3a is exposed through the gaps between the filaments of the yarn, the surface reflectance of the yarn package 1a in such a state changes greatly, causing light to be emitted from the light emitting element 31. The pulsed light no longer enters the light receiving element 32, and the detection pulse signal is no longer transmitted from the light receiving element 32 to the signal processing circuit. Note that when the change in the light incident on the light receiving element 32 is not much different between the case where the package is provided on the bobbin and the case where the bobbin surface is exposed, it is preferable to perform signal processing as follows.

That is, the light receiving element 32 converts the change in the amount of light received into an electrical detection pulse signal, and the pulse voltage of the converted signal is amplified by the amplifier. Next, this amplified pulse voltage is transmitted to a comparator and compared with the set level of the comparator, and if it exceeds the set level, the amplified pulse signal passes through the comparator, and conversely, if it is less than the set level, the amplified pulse signal passes through the comparator. No signal should be generated from the comparator. The pulse signal that has passed through the comparator is transmitted to the signal processing circuit. In the signal processing circuit, the detected pulse signal is transmitted directly or after being amplified by an amplifier (not shown) to a signal discriminator (not shown), and the signal discriminator removes disturbance light, etc. By comparing the phases of the noise signal and the detected pulse signal, only the detected pulse signal is discriminated and transmitted to a retriker monostable multi-circuit (not shown). In the retriker monostable multi-circuit, if the detection pulse signal is continuously transmitted within the operating time, no signal is transmitted, but if the detection pulse signal is transmitted intermittently for longer than the operating time? Or, if the detection pulse signal is not transmitted at all, a minute remaining yarn signal is transmitted. That is, when the amount of yarn remaining in the yarn package 1a becomes very small and the surface of the bobbin 3a is exposed from the gap between the filaments of the yarn, a minute yarn remaining signal is reliably transmitted from the signal processing circuit. Therefore, if the defective yarn generated by the knot 2a is removed as described above either directly or after a delay of a predetermined time using a timer or the like based on the minute remaining yarn signal, normal processing can be achieved. No defective yarns are mixed into the treated yarns.

For example, the time from when the minute remaining yarn signal is transmitted until there is no yarn in the yarn package 1a and the time when the first predetermined length of yarn in the yarn package 1b to be processed next passes. The total time of the detection means is set in advance in a timer, and the timer is activated by the minute remaining yarn signal, and the movement guide 21 is linked to the detection means during the operation period of the timer. In addition to the above-mentioned configuration, the means 30 for detecting the amount of yarn remaining in the yarn package includes a light emitting element 31, a light receiving element 32 that receives light emitted from the light emitting element 31 and reflected on the surface of the bobbin 3a, and a light receiving element 32. Element 32
The circuit detects changes in the reflectance from the light emitting element to the light receiving element due to changes in the amount of light received by the system. It may also be possible to detect that the amount of yarn remaining after use is small.

In addition, instead of detecting the light reflected by the bobbin surface, a light emitting element and a light receiving element are provided on both sides of the bobbin shaft, and the transmitted light from the light emitting element is detected by the light receiving element. It may be detected that the amount is below a predetermined amount.

It is preferable to have the detection means 30 interlock with the moving guide 21 and to automatically change the traverse area of the yarn in the winder 10 at the same time as the knot is detected.

However, it is also possible to check the knot passing timing in advance and manually move the yarn out of the normal traverse area. Note that as a method for returning the yarn from the waist spool position to the normal traverse area A, it is industrially advantageous to automatically return the yarn after a certain period of time has passed since the knot is detected, but it may also be returned manually. . This traverse area change may be performed for all spindles of the machine at the same time, or may be performed for each spindle individually.The key point is to wind the non-uniform yarn before and after the knot part outside the normal traverse area. It's good. In the present invention,
The lower opening thread of the supply system package 1a being processed and the upper opening thread of the supply system package 1b to be processed next are knotted, and the lower opening thread of the supply system package 1b to be processed next is tied together with the lower opening thread of the supply system package 1c to be processed next. The upper opening thread is knotted, and the supply system package 1a
, 1b are processed continuously by tail transfer. Supply system during processing The supply system unwound from the package 1a is fed to the false twisting area by the feed roller 5 at a constant speed via the take-out guides 4, 4', and is twisted to a predetermined value by the friction type false twisting means 6. The applied twist that has traveled upstream is thermally set by a heater 7 and taken off at a constant speed by a delivery roller 8. The false twisted yarn leaving the delivery roller 8 passes through a yarn guide 9 and is wound up by a winder 10 to form a package. In the embodiment shown in FIG. 1, when the addition of the supply system package 1a is almost completed and the amount of remaining yarn becomes very small, before the knot part 2a is supplied to the false twisting area, a supply system installed near the supply package part The remaining yarn amount detection means 30 of the package detects that the remaining yarn amount has become less than a predetermined amount and issues a signal, and the signal activates the moving guide of the winding machine to move the yarn from the traverse guide 11 to the moving guide. is moved from the normal traverse area to the waist spool position on the right side to change the yarn winding traverse position.

Then, the state is maintained for a certain period of time, and the unevenly twisted yarn before and after the knot is wound around the waist spool. After that, the moving guide is moved back to lock the yarn to the traverse guide 11, and the normal traverse is restored. and perform steady-state winding. The supply system used in the present invention may be a normal drawn yarn, a normal undrawn yarn, a highly oriented undrawn yarn (POY) obtained by high-speed spinning, or a semi-drawn yarn that is slightly drawn.

In the case of these undrawn yarns and semi-drawn yarns, it is preferable to false-twist them while drawing them. Although either an internal type or a circumscribed type can be used as the friction type false twisting means, a circumscribed type in which disks are arranged in multiple stages and on multiple axes is preferred.

As a knotting method, a Fisherman type knotting machine or the like is suitable.

When using undrawn yarn as a supply system, it is best to draw and orient only the vicinity of the knot in advance. Can be adopted. Note that it is preferable to finish the knotted end as small as possible using scissors or the like. Note that it is also possible to move the traverse mechanism for winding into the normal traverse area to the waist spool position as it is, and wind the winding onto the waist spool at a constant position or while slightly traversing at that position.

Alternatively, waist winding may be performed at the end of the bobbin. 1st
If the waist spool is driven separately as shown in the figure, it is only necessary to drive the waist spool when necessary, and the load is small. As a processing method after doffing, the yarn outside the normal traverse area, including the knot part, is peeled off and removed, and both ends of the yarn wound in the remaining normal traverse area are knotted.

According to the present invention as described above, it is possible to completely remove non-uniform threads including knot portions without interrupting the processing or reducing the processing speed.

In addition, the amount of waste yarn can be minimized by measuring in advance the length of the yarn that is uneven before and after the knot, and by setting the winding time outside the normal traverse area appropriately in relation to the processing speed. I can do it. Therefore, in the present invention, when false twisting is performed at high speed using the friction type false twisting means, the effect of adopting the tail transfer method can be maximized. Examples of the present invention will be described in detail below.

Example 3 An undrawn polyethylene terephthalate yarn (with an intrinsic viscosity of 0.63 measured in an orthochlorophenol solution at 5°C)
Birefringence 0.045, fineness 225 denier/30 filament) was stretched and false twisted under the following conditions using a false twisting device equipped with a heater and a false twisting means in this order between a feed roller and a delivery roller. I went.

'JH' Ichidai Eso 5 (Akira Vv
・−′ −−−−−−−−−−−−−−1 At this time, the following three methods were implemented and comparisons were made in terms of machine operating rate, amount of waste yarn, uniformity of product winding amount, and product quality.

The results are shown in the table below. Method-1 Stop the machine, knot the yarn end of the supply system connected to the processing machine and the yarn end of the new supply system package supply system, then start operating the machines at low speed all at once, and knot the yarn end of the supply system connected to the processing machine. A method of resuming winding at the normal winding speed after winding the winding.

Method 2: Processing is carried out continuously using one type of tail transfer without stopping the machine, replacing the bobbin only near the knot and winding it miscellaneously, then replacing the bobbin again and resuming normal winding.

Method-3 Method of the present invention

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing one embodiment of the present invention, and FIG. 2 is a front view of a winding machine. 1a, 1b... Supply system package, 2a22b
・・・・・・Dutt part, 3a, 3b・・・Bobbin,
30...Means for detecting the amount of yarn remaining in the yarn package;
5...Feed roller, 7...Zeta,
6... Friction type false twisting means, 8... Delivery roller, 10... Winding machine, 11...
...Traverse guide, 17... ．． Waist spool for winding non-uniform lines including knots.

Claims (1)

[Claims] 1. The lower opening thread of the supply system package being processed and the upper opening thread of the supply system package to be processed next are knotted in advance to give false twist without interrupting processing when switching packages. When false twisting is carried out continuously using a processing machine equipped with means, the amount of yarn remaining in the supply system package on the bottom yarn side is detected, and after detecting that the amount of yarn remaining is less than a predetermined amount, the A false-twisting method characterized in that the false-twisted yarn is wound outside the normal traverse area for a certain period of time before and after the knot portion passes through the false-twisting means. 2. The false twisting method according to claim 1, wherein the false twisting means is a friction type false twisting means. 3. The amount of yarn remaining in the supply system package is detected by a light emitting element that irradiates light onto the surface of the supply system package and a light receiving element that receives the emitted light emitted from the light emitting element to the surface of the supply system package. A false twisting method according to claim 2. 4. The false twisting method according to claim 3, wherein the light emitted from the light emitting element is pulsed. 5. Claims 2 and 3, wherein the friction-type false-twisting means is a circumscribed friction-type false-twisting means in which disks are arranged in multi-axis and multi-stage manner, and the disks are arranged along a spiral so that they partially overlap and intersect with each other.
The false twisting method described in Section 1 or Section 4.