JPS6157421B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a false twisting device having both twisting and feeding functions.

Synthetic yarns such as polyester, nylon, acrylic, diacetate, triacetate, etc. must be false twisted.

There are two types of false twisting devices: spindle type and friction type.

The spindle type was difficult to rotate at high speeds and had a limited twisting ability.

In the friction type, for example, three or more parallel belts are arranged in parallel and run in opposite directions alternately, and the synthetic fiber thread is pulled and wound up while being in contact with the belt surface.

This has the disadvantage that since the belt running and the thread feeding are at right angles, extra tension is applied to the thread and the thread is likely to break.

As another method, a disk type false twisting device is known. For example, there is a description in Japanese Patent Publication No. 1467/1973. Two discs with the same diameter are placed in contact with each other with their central axes offset, and a synthetic yarn is passed between the contact surfaces.

According to this, twisting and feeding are performed at the same time. It can be extremely effective for synthetic yarns such as acetate, which are difficult to twist using conventional methods.

However, setting the disk spacing is extremely difficult. For yarns other than acetate, the critical gap is extremely narrow and unstable. It often becomes like a dumpling and cannot be false-twisted.

A third method has emerged in which two belts are brought into relative contact with each other and the thread is threaded through the contact surfaces. The outer surfaces of the belts are brought into contact with each other at a constant angle, and both belts are run at the same speed. Then, the thread is fed in the direction of the bisector of the belt running line.

As with the disk type, twisting and feeding can be done at the same time, which is convenient.

However, there were some difficulties.

Since the outer surfaces of the belts are brought into contact with each other, contact pressure fluctuations cannot be suppressed. A belt rotating around two pulleys is in an unrestrained state between the pulleys. In addition, due to the action of centrifugal force, the belt naturally vibrates in the direction perpendicular to the surface between the pulleys.

Since a thin thread passes between the surfaces, the contact pressure applied to the thread varies greatly. Natural vibrations cannot be completely suppressed simply by increasing the tension of the belt. Therefore, this drawback is overcome by increasing the contact pressure of the belt excessively. In this way, contact pressure fluctuations can be reduced to some extent, but belt wear becomes severe.

As the belt surface wears, the contact condition changes. As a result, the number of twists becomes indeterminate, and the belt must be replaced frequently.

Further, in such a device, the rotation axes of the pulleys are not parallel. Two of them are parallel, but in a "twisted" position with respect to the other two. Moreover, the twist angle must be made variable. Machining becomes extremely difficult.

There were some difficulties as mentioned above.

Although the present invention uses a crossed belt system, the side surfaces of the belts are brought into contact with each other, and the thread is passed through the belts.

The sides of the belt are brought into cross-contact, and false twisting is performed by the action of the sides of the belt. Similar to the former two, "twisting" and "feeding" are performed at the same time.

However, since it uses the side surface of the belt, it has characteristics intermediate between the former two.

It is easier to set the optimum gap than with a disk.

Less variation in contact pressure than those using the outer surface of the belt. This is because the belt is difficult to deform laterally. Since contact pressure is small, belt wear is also minimal. Even if the side surfaces of the belt wear out, the contact condition remains unchanged, allowing stable operation to continue.

Embodiments will be described below with reference to drawings showing examples.

FIG. 1 is an overall plan view of a false twisting device according to an embodiment of the present invention, and FIG. 2 is a vertical right side view thereof. Third
The figure is a plan view of only the lower base plate, and Figure 4 is a vertical right side view of the same thing drawn horizontally. FIG. 5 is a plan view of the upper base plate, and FIG. 6 is a right side view thereof.

B1 and B2 are a first belt and a second belt.
The first belt B1 is connected between the pulleys P1 and P2.
Belt B2 is stretched between pulleys P3 and P4.

The second belt B2 and the first belt B1 have 4 points a,
At points b, c, and d, the sides are in contact or in close proximity. Since the diameters of the pulleys are the same, there are 4 points a, b, c,
d forms a diamond.

A synthetic fiber thread T passes between two points a and b.

The first belt B1 and the second belt B2 are running at constant speed. The thread T is in contact with both belts at one of the crossing points a and b, and not at the other. For this reason, the belt surface is slightly inclined.

At the contact crossing point (for example, a), the thread T is subjected to "twisting" and "feeding" action at the same time. If the crossing angle of the belt is θ, the thread forms a bisector of the belt angle, so the sine component of (θ/2) contributes to “twisting” and the cosine component contributes to “feeding”.

At other intersection points (for example, b), the thread T and the belt are in contact with each other, so no action is taken.

If it is difficult to make contact at one of the crossing points and non-contact at the other, a guide may be provided so that the thread T passes through only one crossing contact point (for example a).

It is a feature of the present invention that the sides of the belt are brought into contact and the false twist is performed at the side contact points.

Of course, performing false twisting on the side requires various mechanisms. Belt axial movement, angular movement,
Requires various adjustment mechanisms such as pulley movement.

Any known mechanism may be used as these mechanisms.

Below, these mechanisms will be explained in more detail.

The first belt B1 is stretched between the first pulley P1 and the second pulley P2. The first pulley P1 is supported by a support shaft S1, and the second pulley P2 is supported by a support shaft S2. The support shaft S1 of the first pulley P1 is directly fixed to the upper plate 1' of the upper base plate 1. The second pulley P2 is movable.

The support shaft S2 of the second pulley P2 is attached to the moving table 11. The moving table 11 moves horizontally in a square hole 13 in the upper plate 1'. Two sliding rods 17 are provided in the horizontal direction, and the movable table 11 is guided by the sliding rods 17 to move back and forth correctly. The sliding rod 17 is fixed to the upper plate 1' by screws 47 and 48.

A screw hole is horizontally bored in the center of the moving table 11. Pass the tension adjustment screw 6 through the hole in the upper plate 1'.
It is screwed into the screw hole of the moving platform. When the adjusting screw 6 is turned, the moving table 11 moves in the radial direction. The tension of the belt B1 can be appropriately applied by the adjustment screw 6.

The second belt B2 rotates around the third pulley P3 and the fourth pulley P4. The support shafts S3 and S4 of the third pulley P3 and the fourth pulley P4 are fixed to elongated support columns 28 and 29.

As seen in FIG. 2, the support column 29 extends through the arcuate window 9 of the upper base plate 1 and is fixed to the lower base plate 2. As shown in FIG. The support column 29 is fitted and screwed into the mounting seat 39 of the lower base plate 2.

On the other hand, the support column 28 of the third pulley P3 is attached to the movable base 12 of the lower base plate 2. In other words, the mobile platform 1
The support column 28 is fitted into the mounting seat 38 of No. 2 and fixed.

The moving table 12 is guided by a parallel sliding rod 18,
It can move in the radial direction within the square window 14. Reference numeral 7 denotes a tension adjustment screw whose threaded portion 22 at its tip is screwed into a female thread on the movable table 12 through a through hole 24 in the lower plate stand.

The sliding rod 18 is attached to the lower base plate 2 by screws 35, 35.
Fixed against.

By turning the tension adjustment screw 7, the tension of the second belt B2 can be freely adjusted.

First belt B1, first and second pulleys P1, P2
can be raised and lowered along with the upper base plate 1.

Second belt B2, third and fourth pulleys P3, P4
The set can be angularly displaced according to the lower base plate 2.

After all, the upper and lower base plates 1 and 2 can be freely set in the vertical direction and angle.

The upper base plate 1 and the lower base plate 2 are coupled by a core shaft 3 and its shaft cylinder 8.

The shaft cylinder 8 is fixed by a retaining screw 23 that passes through a hole in the base 5 and is screwed into a retaining ring 20 that is integrated with the base 5.

A fitting ring 19 is fitted into the shaft cylinder 8 from above the base plate 5, and further fitted into the through hole of the lower base plate 2. Fitting ring 19
is for appropriately separating the base plate 5 and the lower base plate 2, and may be fixed to the base plate 5 or to the lower base plate 2. Further, it may be loosely fitted without being fixed to any of them.

The cylinder shaft 8 and the lower base plate 2 are simply in sliding contact.
As shown in FIG. 3, the shaft cylinder 8 is fixed to the lower base plate 2 with a set screw 30. In this case, the lower base plate 2 cannot be rotated. However, when the set screw 30 is loosened, the lower base plate 2 can be angularly displaced about the shaft tube 8.

The core shaft 3 is loaded into the shaft cylinder 8 . The core shaft 3 and the shaft cylinder 8 are spline connected. Splines 3' and 8' are formed on the lower outer peripheral surface of the core shaft 3 and the inner peripheral surface of the shaft cylinder 8, respectively.

At the upper end of the core shaft 3, there is an upper base plate 1 and an upper plate 1' thereof.
is fixed. The upper base plate 1 and the upper plate 1' are integrally connected by a connecting screw 26.

The lower end of the core shaft 3 has a female threaded hole, which is screwed into the tip of the elevation adjustment screw 4. The vertical adjustment screw 4 passes through the lower end of the shaft tube 8, extends upward, and is threadedly engaged with the core shaft 3, so that the shaft tube 8 can be moved up and down. Tsuba 2
5 correctly defines the position of the adjustment screw 4.

Further, a spring 10 is placed between the bottom of the shaft cylinder 8 and the lower end surface of the core shaft 3 to lift the core shaft 3.

When the elevation adjustment screw 4 is turned, the lower base plate 1 is raised or lowered. Since the shaft tube 8 and the core shaft 3 are spline-coupled, the upper base plate 1 moves up and down without changing its angle.

Pulleys P1, ~, and P4 are directly under the drive pulley 3.
1 to 34. A drive belt (not shown) is stretched around the drive pulley.

For example, the drive belt (not shown) may drive only the drive-side pulley 32 of the second pulley P2 and the drive-side pulley 34 of the fourth pulley P4.

However, you must be careful about the direction of rotation. In FIG. 1, belt B1 must be stretched clockwise and belt B2 must be stretched counterclockwise.

The operation in the above configuration will be explained.

First, tighten the belt B using the tension adjustment screws 6 and 7.
1. Adjust the tension of belt B2 appropriately.

Synthetic yarn T is connected to intersection points a and b of belts B1 and B2.
Pass it through.

If necessary, loosen the set screw 30 and tighten the belt B1,
Change the intersection angle θ of 2B. In FIG. 1, the case where θ=90° is shown. The crossing angle θ is on the angle scale 15,
16 can be read directly.

θ determines the distribution ratio of "twist" and "feed".
It is similar to the known disk type or known belt type.

Furthermore, adjustment is made using the lift adjustment screw 4 so that the belt B1, thread T, and belt B2 are brought into proper contact with each other at the intersection point a.

When ready, switch on the motor (not shown).

The synthetic fiber yarn that has passed through a heater (not shown) provided at the front stage is pulled forward while being twisted at the intersection point a of the first belt and the second belt. False-twisting can be done smoothly and continuously without applying any additional tension.

Next, the effects of the present invention will be described.

(1) Twisting conditions are not fluctuated because the twisting is done by taking measures against the side where belt vibration is low.

FIG. 7 shows an enlarged cross section of the belt.

The belt consists of fabric 41 and thread 42 and a rubber outer layer 40 covering them. And it has a flat cross section.

The belt is easily distorted in the direction perpendicular to the flat plane.
However, there is little distortion in the lateral direction.

In the case of a known device in which flat outer surfaces are brought into contact with each other, the contact pressure fluctuates because the belt surface vibrates in a direction perpendicular to the surface. For example, the thread was slippery or unstable. Therefore, the tension is increased and the contact pressure is strengthened in advance. This caused significant belt wear.

Because the invention uses the sides of the belt, it avoids the difficulties of vibration. It also requires less contact pressure. Belt wear is also minimal. Moreover, it is not affected by centrifugal force.

(2) Even if the side of the belt wears out, the circumferential speed will not change. There are no fluctuations in twisting conditions, and uneven twisting does not occur.

(3) Even if the thread thickness varies, the belt moves in the axial direction and the contact pressure is automatically adjusted.

In the case of a disc type, variations in thread thickness are fatal. Since the gaps are fixed and unchanging, they form and break into dumplings.

(4) Contact pressure is not affected much by the height of pulleys P1, -, P4.

This is because the belt can move freely to some extent in the axial direction of the pulley. The curvature of the pulley exerts a restoring force toward the center, but it is not very strong.

It is easier to adjust than a disc type or a belt type where the outer circumferential surfaces face each other.

(5) Since the pulley axes are parallel, the support mechanism is simple. Design and machining become easier.
Manufacturing costs can be reduced.

A device having a shaft in a twisted position has a complicated structure and is inevitably expensive.

(6) No lint remains on the contact surface.

The lint is either scattered by centrifugal force or moved from the side to the outer surface due to centrifugal force. The sides containing the contact points are always kept clean.

It has excellent advantages such as This is an extremely useful invention.

[Brief explanation of the drawing]

Fig. 1 is an overall plan view of a false twisting device according to an embodiment of the present invention, Fig. 2 is a longitudinal right side view, Fig. 3 is a plan view of the lower bed plate, and Fig. 4 is a longitudinal right side view of the lower bed plate. 5 is a plan view of the upper base plate, FIG. 6 is a right side view drawn horizontally, and FIG. 7 is an enlarged sectional view of the belt. 1 is the upper base plate, 1' is the upper plate of the upper base plate, 2 is the lower base plate, 3 is the core shaft, 4 is the elevation adjustment screw, 5 is the base,
6 and 7 are tension adjustment screws, 8 is a shaft cylinder, 9 is an arcuate window,
10 is a spring, 11, 12 is a moving table, 15,
16 is an angle scale, 17 and 18 are sliding rods, 19 is a fitting ring, 20 is a retaining ring, B1 and B2 are belts, P1
~P4 is a pulley, S1~S4 are spindles, 31~34
is the drive side pulley.

Claims (1)

[Claims] 1 Pulleys P1, -, P4 supported by substantially parallel support shafts S1, -, S4, and the pulleys P1, -, P
4, the first belt B1 and the second belt B2
and a driving means for driving the first belt B1 and the second belt B2 to travel at a constant speed, and the first belt B1 and the second belt B2 are arranged so as to cross each other so that their side surfaces contact each other, and the contact portion of the side surface of the belt is A false twisting device characterized in that a thread T is passed through a, and twisting and feeding are simultaneously applied.