JPH08199442A - Yarn-threading device for heater - Google Patents

Abstract

PURPOSE: To provide a yarn-threading device which can easily thread a yarn through a non-contact high-temperature cylindrical heater used in textile machinery, for example, a false twister or a drawing-false twister without yarn breakage by fusing. CONSTITUTION: This device comprises a straight pipe 9 for conveying yarn taken out of a package 2 along an air flow, a slit pipe 10 which extends from the outlet of the straight pipe 9 to the inlet of the heater 3, where a slit is formed along the axis line at its lower part and a yarn-conveying nozzle 11a for jetting air from the inlet of the heater 3 into its inside. The yarn-conveying nozzle 11a may approach the heater 3 inlet only on yarn-threading operations and the air jetting from the yarn-conveying nozzle 11a preferably precedes the formation of an air flow in the straight pipe 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a threading device suitable for a non-contact high temperature tubular heater which is present in a textile machine such as a false twisting machine and a drawing false twisting machine.

[0002]

2. Description of the Related Art Non-contact heaters used in conventional false twisting machines and draw false twisting machines are of the slit type in which slits are formed along the yarn running direction. , The heater lid is opened and the running yarn is dropped into the slit.

[0003]

In recent years, a non-contact high-temperature tubular heater having high thermal efficiency has been developed in place of the slit type heater, but the non-contact high-temperature tubular heater prevents heat escape as much as possible. Since it is wrapped with a heat insulating material and is not provided with a lid, it is impossible to directly adopt the thread hooking method of the slit type heater for thread hooking of this non-contact high temperature tubular heater.

The present invention provides a threading device which allows a non-contact high-temperature tubular heater used in a textile machine such as a false twisting machine or a drawing false twisting machine to easily pass the thread without melting it. Is intended.

[0005]

In order to achieve the above object, a threading device for a heater according to the present invention comprises a straight pipe for carrying a yarn drawn from a package on an air stream, and a straight pipe from the outlet to the heater inlet. It comprises a slit pipe extending and having a slit formed downward along the axis, and a yarn conveying nozzle for ejecting air from the heater inlet to the inside thereof. The yarn conveying nozzle may be brought close to the heater inlet only during the threading, and the ejection of air from the yarn conveying nozzle may precede the formation of the air flow in the straight pipe.

[0006]

In the yarn threading device of the heater constructed as described above, when an air stream is formed in the straight pipe, the yarn pulled out from the package riding on the air stream moves in the straight pipe and continues. Is conveyed to the downstream of the slit pipe. Then, the air jetted from the yarn conveying nozzle travels inside the heater and goes out.
Then, he continues to run while being attracted to the waiting hand soccer. At this time, the yarn is not melted because it is protected by being surrounded by the air jetted from the yarn conveying nozzle whose temperature is lowered by adiabatic expansion. When the supply of each air is stopped, the running yarn escapes from the slit of the slit pipe and a predetermined yarn path is formed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a threading device for a heater according to the present invention will be described with reference to FIGS.

The heater to which the threading device [A] of the present invention is applied is, for example, the first one in the drawing false twisting machine shown in FIG.
Used for heater 3. This draw false twisting machine includes a creel stand 1 on which a yarn supplying package 2 in which partially drawn yarns are wound, a first heater 3, and a cooler 4 are provided.
The twisting device 5, the second heater 6, and the take-up winder 7 forming the winding package 8 for the processed yarn are already known. In this drawing false twisting machine, the yarn Y is false twisted by the twisting device 5 and spreads to the first heater 3. There, the yarn Y is plasticized and advances to the cooler 4 to fix the twisted state. Then, when passing through the twisting device 5, reverse twisting is applied, and crimps are manifested in each filament, and the filament becomes bulky. Then, the process proceeds to the second heater 6, the torque is reduced, and the winding package 8
Rolled up. Meanwhile, the yarn Y is about 1.2 times for the polyamide yarn and about 1.6 times for the polyester yarn,
Each is stretched.

First, the first heater 3 will be described with reference to FIGS. The first heater 3 is shown in FIG.
1 shows one heating element 31 constituting the.

As shown in FIG. 3, the heater 3 includes a plurality of heating elements 31 having a yarn traveling space 32, a balloon stopper guide 33 arranged between the heating elements 31 in series, and the heating elements 31. It is composed of a heat insulating material 34 covering the outer periphery and a storage case (not shown).

A plurality of heating elements 31 are connected in series to have a total length of about 1 meter and are composed of a base 31a, an enclosure 31b, and a heating wire 31c.

The substrate 31a is made of silicon dioxide (SiO ₂ ),
A cylindrical body having a thickness of several millimeters, which is made of a ceramic molded body having high thermal efficiency such as aluminum oxide (Al ₂ O ₃ ). The cross section of the base 31a is generally circular, but may be flat as shown in FIG. 8 (1). In that case, the distance from the wall surface of the heater is small even if the yarn Y is on the axis of the heater or away from the axis, so that the thermal efficiency is very good.

The envelope body 31b is also formed of the same ceramic body as the base body 31a, but has a much higher porosity than the base body 31a, and therefore has a very high heat insulating property.

The heating wire 31c is made of a nichrome wire or a kanthal wire and can raise the temperature of the yarn running space 32 to 300 to 700 ° C.

At the center of the tip of each balloon stop guide 33, a slit 33a for guiding the yarn Y is formed by a ceramic member. This balloon stop guide 3
3 are arranged at the inlet and outlet of each heating element 31. Also,
Each balloon stopping guide 33 is fixed to a rod 35 arranged along the axis outside the storage case. Two or three of the rods 35 are arranged around the storage case. Therefore, the respective balloon stop guides 33, when the yarn is traveling, are provided with slits 3 of each other as shown in FIGS. 5 (2) and 5 (3).
3a is butted and the yarn path is regulated. Further, the rods 35 can approach and separate from each other in parallel with the axis of the heater, and the balloon stopping guides 33 can be retracted to the outside of the heater during threading or the like. Therefore, threading becomes easy.

By arranging the balloon stopper guide 33 so that the slits 33a are abutted at the entrance and the exit of each heating element 31, a large tension is not applied to the yarn Y and the yarn path is limited without the balloon. You can run straight without. Therefore, since it is not necessary to arrange the balloon stopper guide 33 in a bow shape, the inner diameter of the heating element 31 can be reduced, and the overall size can be reduced, which can greatly contribute to energy saving. Moreover, the temperature stability becomes high, the influence of the accompanying flow can be made very small, and the production is easy.

Further, each heating element 31 is provided with an auxiliary nozzle 36 in the heater for ejecting air B in the yarn advancing direction at the time of threading which will be described later. As shown in FIG. 2, the auxiliary nozzle 36 in the heater may be provided below the heating element 31, and as shown in FIG. 4, the auxiliary nozzle 36 may be placed above, below, left, and right of the heating element 31 via the air reservoir 36a. It can also be made to squirt. When the air B is blown out from the auxiliary nozzle 36 in the heater during threading, the thread Y can pass smoothly without contacting the heater wall surface. Further, the air B blown out from the auxiliary nozzle 36 in the heater also contributes to the cooling of the heating element 31, so that the threading success rate is further improved.

Next, referring to FIGS. 2 and 6 to 10,
The threading device [A] will be described.

This threading device [A] is used for the yarn supplying package 2
The straight pipe 9 for transporting the yarn Y to be unraveled on the air flow, the slit pipe 10 connected to the outlet side thereof for guiding the yarn Y to the inlet side of the heater 3, and the slit pipe 10 provided at the downstream end thereof It is composed of a nozzle cover 11.

The heater 3 in which the threading device [A] is installed has a slit pipe 10 which will be described later at the time of threading.
Nip roller 12 which moves backward from the yarn path immediately below and advances to the yarn path after threading, rotates freely, twisting tensor roller 13 and threading failure thread does not wind around nip roller 12. Suction device 1
4 and are arranged. Further, a guide 15 made of ceramic is provided between the straight pipe 9 and the slit pipe 10 and at a lower position deviated from the yarn path at the entrance of the heater 3, respectively.
16 are arranged. Reference numeral 17 is a smoke exhaust pipe for smoke emitted from the heater 3 due to the attachment of cutting threads or the like.

The straight pipe 9 is a straight tube whose main portion has a thread passage, and a ceramic guide 9a is attached to the inlet. A yarn blowing nozzle 9b is provided on the upstream side of the yarn passage, and an auxiliary nozzle 9c is provided on the downstream side.
Are opened so that the yarn advancing direction is directed. At the time of threading, the air A is ejected from each of the nozzles 9b and 9c, the air Y ejected from the former is unwound from the yarn supply package 2 and blown up, and the air A ejected from the latter, Stretched and slit pipe 10
Sent to.

The slit pipe 10 is bent in a U-shape so as to extend to the inlet of the heater 3 following the guide 15 at the outlet of the straight pipe 9, and inside the bend, that is, downwardly along the axis. As shown in FIG.
The slit 10a is formed. FIG. 6 (2) shows a slit pipe in which the cross section is wound into a "no" shape, and in this case, the nozzle 10b from which the air A is ejected is connected to the tangential line along the "no" shape. It is advisable to open it in the direction of the yarn and the direction of travel of the yarn. The wound slit pipe 10 can be effectively used without leaking air, and only the yarn Y can be let out from the slit 10a.

The nozzle cover 11 is a slit pipe 10.
Similar to the above, it is a tubular body having a slit formed downward along the axis, and at its downstream end, air b is ejected toward the inlet of the heater 3 to create a flow of air in the heater 3. A transfer nozzle 11a is provided. Further, the nozzle cover 11 has a slit pipe 10 as shown in FIG.
By the air cylinder 11b installed at the downstream end of the yarn, it approaches the inlet of the heater 3 during threading, and does not hinder the smoke exhausted by the smoke exhaust pipe 17 after threading and retracts to a position where the thread skipping nozzle 11a is not polluted. You can

By providing the nozzle cover 11 with such a yarn skipping nozzle 11a, each of the 9 nozzles 9
The flow of the yarn ejection air A ejected from b and 9c can be stabilized and the yarn can be reliably conveyed.

There are various modes of the yarn skipping nozzle 11a shown in FIGS. 8 and 9. That is, the one shown in FIG. 8A is one on the nozzle cover 11, and is suitable for the flat heater. 8 (2) is the nozzle cover 1
There are several tubes surrounding 1 and a stable air flow can be obtained. The nozzle cover 11 shown in FIG.
One is provided so as to surround the, and a more stable air flow can be obtained. In the case of FIG. 9 (1), there is one in the nozzle cover 11, and strong air can be made to flow to the axis of the heater. 9 (2) corresponds to FIG.
Each of the yarn skipping nozzles 11a of (2) is further narrowed at the end, which is also similar to that of FIG. 9 (1).

Further, as shown in FIG. 10, the yarn skipping nozzle 11a can be fixed to the slit pipe 10 so as not to move. In this case as well, even if the slit pipe 10 is long due to the positional relationship between the yarn supplying package 2 and the heater 3, the yarn skipping nozzle 11a is provided, so that the yarn can be stably and stably fed in the heater 3. You can fly. In this case, it is necessary to install the yarn skipping nozzle 11a away from the smoke exhaust pipe 17 so that the smoke exhausting of the smoke exhaust pipe 17 is not hindered and the yarn skipping nozzle 11a is not polluted.

In the yarn threading device for the heater constructed as described above, the yarn Y drawn from the yarn feeding package 2 set on the creel stand at the time of the yarn threading or the yarn breakage at the start of operation is straight piped. The hand sucker 18 is made to stand by in the air suction state at the outlet of the heater 3 while being guided to the inlet of 9. Then, at the timing shown in FIG. 7, first, the air A is jetted to the yarn skipping nozzle 11a and the auxiliary nozzle 36 in the heater, and the air A is also supplied to the air cylinder 11b, so that the nozzle cover 11 and the yarn skipping nozzle 11a enter the heater 3 inlet. Approach. Subsequently, the yarn blowing nozzle 9b and the auxiliary nozzle 9c
The air A is jetted out onto the straight pipe 9, and the yarn Y guided to the inlet of the straight pipe 9 moves in the straight pipe 9 while being drawn from the yarn feeding package 2, and the slit pipe 10
The air B ejected from the yarn skipping nozzle 11a enters the heater 3 and the air B ejected from the auxiliary nozzle 36 in the heater aboard the heater 3.
Move outside.

The yarn Y thus moved to the outlet of the heater 3 travels while being sucked by the hand soccer 18 on standby. Therefore, the yarn moving to the hand sucker 18 in the heater 3 is surrounded by the air jetted from each nozzle whose temperature is lowered by adiabatic expansion and is protected, and therefore is not melted. Further, even after the supply of the air A, B is completed after being sucked by the hand soccer 18, the yarn Y runs at a high speed, so that the yarn Y does not melt.

The supply of air A and B is stopped, and the heater 3
When the threading into the inside is completed, the running thread escapes from the slit 10a of the slit pipe 10, and a predetermined threading is performed on the nip roller 12 and the tensor roller 13 which have advanced to the thread path immediately before.

[0030]

Since the present invention is configured as described above, it has the following effects.

That is, threading the heater is performed by fusing the thread,
It can be performed in a short time and easily with almost no failure such as non-passage. Further, after threading, the thread escapes from the slit of the slit pipe and a predetermined threading is performed, so that the thread tension during threading can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a drawing false twisting machine.

FIG. 2 is a front view showing a cross section of a part of the threading device of the heater according to the present invention.

FIG. 3 is a vertical cross-sectional view of a heater in which the threading device of the present invention is adopted.

FIG. 4 is a view of a heating element of a heater in which the threading device of the present invention is adopted, (1) is a longitudinal sectional view, and (2) is a lateral sectional view.

5A and 5B are views relating to a balloon stop guide of a heater in which the threading device of the present invention is adopted, (1) is a plan view of itself, and (2) and (3) are views showing usage modes thereof, respectively. is there.

FIG. 6 is a view showing an example of a cross section of a slit pipe which constitutes the threading device of the present invention.

FIG. 7 is a diagram showing various air blowing timings in the threading device of the present invention.

FIG. 8 is a diagram showing three modes of a yarn skipping nozzle that constitutes the yarn threading device of the present invention.
(B) is the figure seen from the outlet side, and a cross-sectional view.

9 (a) and 9 (b) are views showing another two modes of the thread skipping nozzle, wherein (a) and (b) are a view seen from the outlet side and a cross-sectional view, respectively.

FIG. 10 is a transverse cross-sectional view of a fixed type yarn ejection nozzle.

[Explanation of symbols]

 2 Yarn supply package 3 Heater 36 Auxiliary nozzle in heater 9 Straight pipe 9b Thread blowing nozzle 9c Auxiliary nozzle 10 Slit pipe 11 Nozzle cover 11a Thread skipping nozzle 12 Nip roller 18 Hand soccer

Claims (3)

[Claims] 1. A straight pipe for carrying a yarn pulled out from a package by carrying it on an air flow, a slit pipe extending from its outlet to a heater inlet, and having a slit formed downward along an axis, and its interior from a heater inlet. A yarn threading device for the heater, which consists of a yarn conveying nozzle that blows air into the air. 2. The threading device for the heater according to claim 1, wherein the thread conveying nozzle approaches the heater inlet only during threading. 3. The threading device for a tubular heater according to claim 1, wherein the jetting of air from the thread conveying nozzle precedes the formation of an air flow in the straight pipe.