JPS5828381B2 - Belt type false twisting unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a false twisting device, particularly a belt type false twisting unit.
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A device is known in which two (7,1) belts are run in opposite directions and the yarn is nipped between the two opposing belts to perform false twisting.

That is, two flexible belts are crossed at a set angle and run in opposite directions, and by nipping the thread between the belts, the running force of the running belts is used to rotate the thread and send out the thread. This is a type of force that applies false twist to the yarn.

In such a belt-type false twisting device, the intersecting parts of the two belts are pressed together in surface contact, and the yarn is nipped between the belts, but in this case, the twist imparted to the yarn is stable to some extent. However, since the two belts run at a constant angle, friction occurs on the contact surfaces of the belts, causing belt wear.If lubricants such as water and oil are not constantly supplied, the belt life will be shortened. There is a drawback.

In addition, since the yarn nipped at the intersection of the belts is in contact with the belt over a length longer than the belt width, the nip point and the twisting point constantly move, resulting in heating and untwisting areas. Therefore, if the twisting point moves to the heating side, an over-untwisted part will occur in the yarn, and on the other hand, if the twisting point moves to the untwisting side, an untwisted part will occur in the yarn. , it will not be a uniform false twisted yarn and will cause the quality to deteriorate.

Furthermore, there is a false twisting unit that is rotatable about a single axis around a bracket that supports a pulley that extends the belt in order to facilitate the threading process when threading the belt intersection. In this case, a means for positioning the rotating bracket is required, and the bracket vibrates due to the yarn running at high speed, and the contact pressure of the six belts may vary during twisting, resulting in uneven twisting.

The present invention has been made in order to eliminate the various drawbacks mentioned above, and is made by pressing a rotatable spherical roller from inside one of the belts, and using the pressing force to bring the two belts into point or line contact. By nipping the yarn at the contact portion, the point of contact between the yarn and the belt, that is, the twisting point, is held at a constant position.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of a false-twisting device having a belt-type false-twisting unit.

That is, the yarn Y pulled out from the yarn supply bobbin 1 passes through the twist fixing heater 2, rises, passes through the deflection roller 3.4, is introduced into the balloon guide 5, and is cooled in the ζ rune guide 5 area. The yarn, which has been cooled by a cooling device using water as the case may be, is introduced into a belt-type false twisting unit T.

The yarn that has passed through the false twisting unit T is introduced into the torque elimination heater 6 as the case may be, and then travels to the winding section where it is attached to the winding bobbin γ.
It is wound up.

In FIG. 2, which shows the schematic structure of the false twisting unit L-T, the first endless belt (Vl) which is hung around the pulleys 9 and 10 of the bracket 80 and the second endless belt V2 which is held by the pulleys 12 and 13 of the bracket 11 are shown. The belts V1.
(2) Thread is passed between the two under constant contact pressure, and a heating force and a feeding force, which are components of the belt running force, are applied to the thread.

Note that the bracket 8 is fixed to a base 14, and the base 14 is rotatable around a fixed shaft 15.
is fixed to a base 16, and the base 16 is rotatably supported with respect to a protruding disc body 17 formed on one of the bases 14, so that the bracket (8.11) It is rotatable only in the plane, and Bell 1-Vl
, V2 can be freely adjusted.

Further, in FIGS. 3 and 4, a spherical roller 18 provided on one bracket 8 is shown.

That is, the drive shaft 19 is rotatably supported by the bracket 8.
A pulley 9 is fixed to the pulley 9, and a belt v1 is stretched between the pulley 9 and the pulley 10.

The drive shaft 19 has a bearing 21 in a hollow fixed cylindrical body 20.
A lever 23 is rotatably supported on the cylindrical body 20 via a needle bearing 22.

A shaft 24 is connected to the drive shaft 1 of the pulley 9 at the tip of the lever 23.
9, and a roller 18 is rotatably supported on the shaft 24 via a bearing 25.

Therefore, by pivoting the lever 23, the roller 18 is moved by the bell)V
It is possible to press and separate the back surface V1a of 1.

The roller 18 has a spherical surface.

Further, the bracket 8 is provided with a tension adjustment mechanism S for the belt 1 which is applied to the pulleys 9 and 10.

The tension adjustment mechanism is similarly provided in the bracket 11, and the explanation will be given with respect to the bracket 18.

That is, the pulley 10 is located within the window 26 formed in the bracket 8.
A U-shaped support 27 supporting the
A rod 28 passing through is rotatably supported by the bracket 8.

A threaded portion 29 is formed on a portion of the rod 28, and a square plate 30 is screwed into the threaded portion. When the rod 28 is rotated, the square plate 30 comes into contact with the side walls 31, 31 of the bracket 8 and is prevented from rotating.
It moves along the threaded portion 29.

Further, a spring 33 is wound around the rod 28 and supported between the square plate 30 and the side plate 32 of the pulley support 27, and urges the pulley support 27 rightward in FIG.

The capacity side plate 34 of the pulley support 27 is located at the tip of the pulley support 27.
A groove 35 is cut and lies across a pin 36 fixed to the bracket 8, which prevents the pivoting of the pulley support 27 about the rod 28 and acts as a movement guide.

Therefore, by turning the knob 37 at the end of the rod 28, the rod threaded part 29 is rotated, the square plate 30 is moved to the right or left, and the force of the spring 33 is changed.
The tension of the belt V1 applied therebetween can be adjusted.

FIG. 4 shows an example of the operating mechanism of the lever 23 that supports the roller 18.

That is, a protrusion 38 is formed at the end of the lever 23, and a spring 41 is connected between the protrusion 38 and a slider 40 that is movable along a grooved guide 39 fixed to the side surface of the bracket 8.

Therefore, the lever 23 is urged around the cylindrical body 200 by the spring 41, that is, counterclockwise.

Furthermore, a threaded rod 42 is attached to the female thread carved on the slider 40.
are screwed together, and the threaded rod 42 is supported by passing through a block 43 fixed to the bracket 8.

Therefore, by rotating the threaded rod 42, the slider 40 moves to the right or left, and when moving to the right, the spring 41 is stretched and the biasing force of the lever 23 is further increased, and the belt of the roller 18 is moved. ■1 The contact pressure to the back side will increase.

Note that if a scale 44 is provided around the threaded rod 42, the contact force of the roller 18 can also be set.

In such a false twisting unit, when a false twisting action is performed by nipping the yarn between the belts, the first belts V1. When the roller 18 is pressed against the back surface of the first belt (V1) of the second belt v2, the first
As shown in FIG. 6, the belt V1 bends in accordance with the shape of the surface of the roller 18 and comes into pressure contact with the second belt V2 at the intersection.

Note that the roller is preferably provided on the lever 23 so that the central axis 45 passing through the center of rotation of the roller 18 passes through the center point of the belt intersection, that is, the nip point P.

Therefore, the contact portion between the first belt V1 and the second belt V2 is a point contact at the nip point P, but in reality, the second belt V1 is in contact with the second belt V2.
2 also causes some deflection and is not an ideal point contact.
Line or surface contact.

However, compared to the case where the entire belt area at the intersection is in contact, line or surface contact is considered to be a very small point contact.

Therefore, the false twisting point (nip point P) is positioned at a fixed position in the center shown in FIG.

Therefore, the lengths of the heating zone and the untwisting zone with the nip point as the boundary can be kept constant during the entire process.

Furthermore, even when the crossing angle θ of the belts V1 and V2 is changed, if the belts V1 and V2 are moved by equal angles, the nip point P remains at a constant position and does not shift back and forth or left or right.

Note that when the thread is not passing between the belts, such as when the thread breaks, the contact pressure of the roller 18 can be set to zero, that is, if the threaded rod 42 is rotated in the opposite direction, the thread can be moved between the first and second belts at the belt intersection. The mounting positions of the brackets 8 and 110 are determined so that there is a slight gap between the two bars.

Note that even if a cylindrical roller is used instead of the spherical roller 18, the nip point will be at a constant position, but the contact between the belts will be a line contact, which is not preferable from the point of view of belt wear.

Further, it is also possible to use a roller whose cross section passing through the axis of rotation of the roller outside the spherical surface and parallel to the axis is elliptical, and is not limited to a spherical roller.

Furthermore, in the above embodiment, only one of the belts was pressed by a roller, but it is also possible to press both belts by a roller and make point contact between the belts, but in this case, the mounting position of the suppression roller must be accurately set. is necessary.

As described above, in the present invention, the first,
A spherical roller that presses the back surface of the belt is arranged at the intersection of the second belt, so that the belt at the intersection comes into contact with the belt in a bent state along the surface of the spherical roller. Since the yarn is nipped at the contact point, the contact area between the belts is reduced, reducing belt abrasion and heat generation, increasing belt life, and keeping the yarn nip point constant, preventing over-untwisting.
It is possible to prevent the occurrence of untwisted yarn and obtain high quality false twisted yarn.

Further, in the present invention, the spherical roller is supported by a bracket and is rotatable, and the intersecting angle between the belts is changed by making the axis of rotation parallel to the axis of the pulley of the bracket as shown in the drawing. However, the rotating shaft of the spherical roller maintains a posture perpendicular to the running direction of the belt with which it is in contact, so that the belt can run smoothly and no uneven false twisting occurs.

[Brief explanation of drawings]

Fig. 1 is a schematic side view showing an example of a false twisting device, Fig. 2 is a schematic structure diagram of a belt-type false twisting unit, and Fig. 3 is an embodiment of the belt intersection part of the false twisting unit according to the present invention. Cross-sectional side view, Figure 4 is the same plan view, Figure 5 is Bell) Vl, V
FIG. 6 is an enlarged side view showing the intersection portion of No. 2, and FIG. 6 is a cross-sectional front view showing the contact state of the intersection portion. 8.11...Bracket, 9,10...-
Pulley, 18... Spherical roller, 23...
...Lever, Vl...--First belt, v2...
...Second belt, P...Nip point.

Claims (1)

[Claims] 1 A belt-type false twisting unit that performs false twisting by nipping yarn between a first endless belt and a second endless belt that run in opposite directions, and a spherical The spherical roller is rotatably supported on a lever that is rotatably supported by a bracket that supports the pulley, and the rotation axis of the spherical roller is connected to the rotation axis of the pulleys. The spherical roller is parallel to the axis, and one end of the lever is biased by a spring to press the spherical roller against the back surface side of the first belt, and the surface side of the first belt at the pressure contact portion is connected to the second belt. A belt-type false twisting unit characterized by intersecting threads to nip them.