JPH0860464A - Cooling plate of draw false-twisting machine - Google Patents

Abstract

PURPOSE: To provide a cooling plate of a drawing false-twisting machine capable of reducing the contact resistance with a yarn while maintaining sufficiently high cooling effect and coping with the increase in the processing speed. CONSTITUTION: This cooling plate 17 has a nearly inverted V-shaped cross-section and is provided with a plurality of yarn non-contacting parts 18 formed along the yarn-contacting running path interposing spaces between the non- contacting parts. The pitch of the non-contacting, parts is long at the yarn- introducing side and short at the yarn-delivery side. The individual length of the non-contacting part is short at the yarn-introducing side and long at the yarn-delivery side. The non-contacting part has a form of indented recess.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling plate for a draw false twisting machine.

[0002]

2. Description of the Related Art A drawing false twisting machine is supported by a creel stand 3 (the left side portion in the figure is omitted) installed on both sides of a machine base 1 through passages 2 as shown in FIG. 3 which is a side view. The yarn Y unwound from the yarn feeding package Ps is guided by the separate plate 4 and guided to the first feed roller 5, and passes through the primary heater 6, the cooling plate 7, and the twister unit 8 for texturing, and then the second feed roller. In the process of reaching 9, the yarn Y is stretched while being heated, and the yarn Y is false twisted by a twister unit 8 composed of a pair of twister belts which intersect each other in the traveling direction and contact each other. The winder 13 passes through the next heater 10, the third feed roller 11, and the oiling roller 12, and is wound around the winding package Pw. Many are juxtaposed in a trapezoidal longitudinal direction.

The cooling plate 7 exits the primary heater 6 and cools the yarn Y in a high temperature state to a predetermined temperature, so that the yarn Y is introduced into the twister unit 8 in a high temperature state and twisted. It is provided for the purpose of preventing indefiniteness and alteration of the twister belt, and preventing the yarn Y from ballooning on the upstream side of the twister unit 8 and varying the yarn tension.

Conventionally, this cooling plate 7 is shown in FIG.
As shown in FIG. 3, the elongated metal plate is bent to form a substantially V-shaped cross section, and is curved slightly downward in the length direction. This is a yarn Y that runs slightly suspended by its own weight.
, So that the high temperature yarn Y and the cooling plate 7 which radiates the heat of the yarn Y into the air can be sufficiently exchanged so as to make uniform sliding contact with the cooling plate over the entire length. This is for efficiently cooling the yarn Y.

At this time, the contact surface of the cooling plate 7 must be made sufficiently smooth in order to prevent the surface of the yarn Y slidingly contacting the cooling plate 7 from being adversely affected, but on the other hand, the contact surface is smooth. Then, there is a problem in that the yarn Y is brought into close contact with the contact surface to increase the contact resistance and the yarn tension increases during high-speed processing to cause yarn breakage.

[0006]

In view of the above-mentioned problems of the prior art, the present invention is capable of reducing the contact resistance with the yarn while ensuring a sufficient cooling effect, and drawing capable of coping with high speed. It is intended to provide a cooling plate for a false twisting machine.

[0007]

Means for Solving the Problems A plurality of non-contacting portions are formed intermittently along a yarn contacting traveling path of a cooling plate having a substantially inverted V-shaped cross section, and the non-contacting portion is on the yarn introducing side. Is arranged at a long pitch interval and on the yarn sending side at a short pitch interval. Further, it is assumed that the length of each of the non-contact portions is small on the yarn introduction side and large on the yarn delivery side. Further, it is assumed that the non-contact portion is a pressing recess.

[0008]

On the yarn introducing side where the yarn is at a high temperature near the primary heater, the ratio of the portion in contact with the yarn is high, the cooling effect is prioritized, and the cooling is already achieved to some extent near the twister unit and the second feed roller. On the yarn delivery side, the proportion of the portion that is not in contact with the yarn is increased, the contact resistance with the yarn is reduced, and the increase in yarn tension and the accompanying yarn breakage are prevented.

[0009]

Embodiments will be described with reference to the drawings.

FIG. 1 shows a cooling plate 17 according to the first embodiment of the present invention. Since the drawing false twisting machine itself is the same as that described in the conventional example, common members are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, the cooling plate 17 is
The elongated metal plate is bent to form a substantially inverted V-shaped cross section, and is slightly curved downward in the lengthwise direction. The yarn Y running in a state of being slightly suspended by its own weight is of the cooling plate 17. It can be slid evenly over the entire length.

As the material of the cooling plate 17,
A stainless plate or the like is used in consideration of thermal conductivity and wear resistance. The cooling plate 17 intermittently forms a large number of pushing recesses 18 along the contact travel path of the yarn Y, that is, the inner top portion of the cooling plate 17 having an inverted V shape. Y is not in contact with the cooling plate 17.

The pushing recesses 18 are formed on the thread introducing side 17i.
Is arranged at a long pitch interval Pi and at the yarn delivery side 17o at a short pitch interval. For example, for a cooling plate 17 having a total length of 2100 mm and a thickness of 1 mm, the length L = 6 m
The pushing recess 18 having a depth of 3 mm and a depth of 3 mm has a pitch Pi = 200 to 300 mm on the yarn introducing side 17i (first half) and a pitch Po = 20 to 50 mm on the yarn sending side 17o (second half).
The proportion of the non-contact portion (18) in this case is 2 to 3% on the yarn introducing side 17i and 10 to 2 on the yarn sending side 17o.
It will be about 3%.

With the above construction, the yarn introducing side 17i, which is close to the primary heater 6 and the yarn Y is at a high temperature, has a large proportion of the contact portion with the yarn Y, and the cooling effect is prioritized. On the yarn delivery side 17o, the yarn introduction side 1 has already been
Since the cooling has been achieved to some extent with 7i, the contact resistance with the yarn Y is reduced even if the cooling effect is somewhat sacrificed, whereby the yarn tension is increased during high-speed processing, and with it. It is possible to prevent thread breakage. Also,
By providing the pressing recessed portion 18, the cooling plate 1
There is also an advantage that the surface area of 7 is increased, and that heat is promoted by the inflow of air into the pressing recess 18. The pitch P of the push-in concave portion 18 may be gradually reduced from the yarn introduction side 17i toward the yarn delivery side 17o.

FIG. 2 shows a cooling plate 27 according to a second embodiment of the present invention. The cooling plate 27 has individual pitches P of intermittently arranged pushing recesses 28 instead of a constant pitch P. The length L of the pushing recessed portion 28 is short on the yarn introducing side 27i as shown by Li in FIG.
The yarn delivery side 27o has the same effect as the cooling plate 17 of the first embodiment shown in FIG. 1 by making it longer as indicated by Lo in FIG. Further, by applying the constitution of the first embodiment to the constitution of the second embodiment, the pushing recess 28
The pitch P of the yarn introduction side 27i is large,
Needless to say, it may be small in o.

In each of the above-mentioned embodiments, the portions of the cooling plates 17 and 27 which are intermittently arranged and which are not in contact with the thread are
In both cases, the pressing recesses 18 and 28 are shown.
If the non-contact portion is a cutout hole, the strength of the cooling plate will be reduced by that amount, but on the other hand, there is an advantage that hot air trapped inside the cooling plates 17 and 27 is discharged through the cutout hole.

[0017]

As described above, the cooling plate of the drawing false-twisting machine of the present invention has a plurality of non-contact portions intermittently formed along the yarn contacting travel path of the cooling plate having a substantially inverted V-shaped cross section. The non-contact portions are arranged at a long pitch interval on the yarn introduction side and at a short pitch interval on the yarn delivery side, or the length of each non-contact portion is small on the yarn introduction side and the yarn delivery is performed. Since it is large on the side, the ratio of the contact part with the yarn is large on the yarn introducing side, the cooling effect is given priority, and the ratio of the non-contact part with the yarn is large on the yarn sending side which has already been cooled to some extent. Further, the contact resistance of the yarn is reduced, the increase of the yarn tension at the time of high-speed processing and the accompanying yarn breakage can be prevented, and the cooling effect and the high-speed drawing false twisting process can be achieved in a well-balanced manner.

Further, since the non-contact portion is the pushing concave portion, it is advantageous in terms of strength in constructing the cooling plate, and by providing the pushing concave portion, the surface area of the cooling plate is increased and the pushing concave portion is formed. The inflow of the air promotes heat dissipation and improves the cooling efficiency.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a cooling fret according to a first embodiment of the present invention.

FIG. 2 is a side sectional view showing a cooling fret according to a second embodiment of the present invention.

FIG. 3 is a side view showing a drawing false twisting machine.

FIG. 4 is a perspective view showing a conventional cooling plate.

[Explanation of symbols]

 5 First Feed Roller 6 Primary Heater 8 Twister Unit 9 Second Feed Roller 17,27 Cooling Plate 17i, 27i Thread Introducing Side 17o, 27o Thread Delivery Side 18, 28 Push-in Recess (Non-contact Part)

Claims (3)

[Claims] 1. A plurality of non-contacting parts are intermittently formed along a yarn contacting traveling path of a cooling plate having an approximately V-shaped cross section, and the non-contacting parts have a long pitch interval on the yarn introducing side. The cooling plate of the draw false twisting machine is characterized in that the yarn sending side is arranged at a short pitch. 2. A plurality of non-contacting portions which are not in contact with the yarn are intermittently formed along the yarn contacting traveling path of the cooling plate having a substantially inverted V-shaped cross section, and the length of each non-contacting portion is the yarn introducing side. The cooling plate of the draw false twisting machine is characterized by a small size and a large size on the yarn sending side. 3. The non-contact portion is a pressing recess.
Alternatively, the cooling plate of the drawing false twisting machine according to 2.