JPS6225769B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for false twisting a synthetic thread by imparting a false twist to it by friction.

Devices of this type are well known and include three pivotably supported shafts each provided with at least one rotationally symmetrical friction element. When viewed from above, these three shafts form the vertices of an equilateral triangle and can be adjusted individually, and the thread to be twisted is passed between the friction elements. The three shafts are such that at least one shaft can be shifted relative to the other shafts for threading between the friction elements (West German patent application no.
No. 2213147).

Each of the three shafts can be provided with a belt pulley, the belt pulley of one shaft being connected to the drive motor and the belt pulley of the other shaft being connected indirectly via an elastic belt connecting all the belt pulleys. can be connected to. Another known processing device is driven via a gear wheel mounted on a shaft and meshing with a cog belt (Swiss Patent No. 591,578).

A disadvantage of elastic belts and cog belts is that they are not suitable for the very high speeds of operation required of modern twisting devices. Conventional elastic belts require a large amount of elastic stretch to absorb the movement of the shaft that is shifted for threading, but with such elastic belts, power transmission is not constant over time and due to stretch. In addition to slippage and a very short service life, cog belts require the use of relatively small gears with fine pitches due to space constraints. Furthermore, the tension of the belt must be relatively high, and therefore the belt and gear cannot be meshed continuously and accurately.

The object of the present invention is to eliminate the above-mentioned disadvantages by providing a device of simple construction and reliable torque transmission for individual shafts in a friction twisting machine of the above-mentioned type.

According to the invention, these requirements are met by providing three parallel shafts positioned at the vertices of an equilateral triangle and each having a friction element, at least one of which is connected to the other in order to thread the thread between the friction elements. The shafts can be shifted relative to each other, and each shaft is provided with a belt wheel, and the endless belt temporarily twists the yarn by applying friction that connects all the belt wheels. In the twisting device, an additional shaft with a belt pulley is provided, the additional shaft being connected to the shaft supporting the friction element and the additional shaft supporting the friction element. 4
The four shafts are positioned such that a line connecting the centers of the four shafts forms a quadrilateral, the four shafts being such that one pair of opposing shafts is shiftable with respect to the other pair of opposing fixed shafts; This is achieved by the endless belt having a relatively low elasticity so as to connect the sheaves of all shafts.

This solution is such that for threading purposes the shifting of each pair of opposing shafts forming a quadrilateral requires only a minimal change in the length of the belt. This feature therefore allows the use of belts with minimal elasticity and supporting structure, which allows the power transmission to be constant over time even at very high speeds and to extend the service life of the belt. .

Preferably, one pair of shafts supporting friction elements located at opposite vertices of the quadrilateral can be shifted with respect to another opposite pair of fixed shafts. The additional shaft can be parallel to or perpendicular to the shaft supporting the friction elements, in which case guide rolls are used to support the belt.

Two embodiments of the invention will be described below with reference to the accompanying drawings. These figures are schematic in pure frame.

FIG. 1 shows a base plate 1 supporting two shafts 2, 5 and comprising two bearing blocks 6, 7, on which rods 9, 10 supporting a retaining plate 8 slide. It is attached so that it can be adjusted by movement. The two shafts 3 and 4 are the retaining plate 8
is mounted on the substrate 1 and guided downward through a corresponding perforation provided in the substrate 1. The shafts 2, 3, 4 support friction elements (not shown) in their portions projecting upward from the base plate 1. Shaft 5 is an additional shaft.

As shown in Fig. 2, shafts 2, 3,
4 and 5 are arranged so that they face each other and a line connecting their centers forms a quadrilateral in the shape of an octopus.

Belt pulleys 11, 12, 13, and 14 that are in contact with an endless belt 15 are attached to portions of the shafts 2, 3, 4, and 5 that extend downward from the base material 1, respectively. An electric motor 16 is connected to the portion of the additional shaft 5 extending upward from the base plate 1 for driving this shaft.

As shown in FIG. 3, the holding plate 8 having the shafts 3 and 4 can be moved in the direction indicated by the double-headed arrow C by means of levers 9' and 10' provided on the rods 9 and 10, respectively, and the operating position is indicated by the solid line. The non-active position shown in phantom is shown in the threaded state of the device. In the working position, the line connecting the centers of the shafts 2, 3, 4 forms an equilateral triangle. As shown in FIG. 2, when the shafts 3, 4 are shifted from their working position to their non-working position or vice versa, the belt pulley 1
The shafts 3, 4 with 2, 13 respectively change their position 3', 4', 12', 13' without significantly affecting the length of the belt 15. Therefore, a belt 15 with minimal elasticity and support structure can be used.

In the specific example shown in FIG.
The shafts 2, 3, 4 with 2, 13 are horizontal but supported by vertical base plates and sliding retaining plates, which base plates and retaining plates as shown in the first embodiment are shown in FIG. Not shown. The additional shaft 5 is vertical and the endless belt 15 has belt pulleys 12, 13.
It passes through guide rolls 17 and 18 and is guided to a belt pulley 14 provided on the shaft 5. A line connecting the centers of shafts 2, 3, 4, and 5 forms a quadrilateral with two pairs of adjacent sides, and as shown in FIG. The paired sides c and d have unequal lengths and are bent. The belt pulley can be placed in pressure contact with the drive belt 19.

If an electric drive motor is connected to an additional shaft which is mounted on a belt pulley and does not support friction elements, this motor will depend on the diameter of the friction elements and the electric motor to ensure that these shafts are not affected by its action. It must be located very close to the sliding shaft to prevent it from being displaced from its position to its inactive position.

According to another embodiment of the invention, this disadvantage can be overcome by providing sufficient space between the fixed shaft supporting the friction element and the additional fixed shaft and using this space to control the friction element in the working position. This can be avoided by at least 2.5 times the corresponding spacing between the supporting shafts and by positioning guide rolls for the endless belt between the sheave of the sliding shaft and the additional fixed sheave.

Preferably, both fixed shafts are spaced at least equal to 3 to 4.5 times the corresponding spacing when the shaft supporting the friction element is in the active position. According to the invention, by maintaining a relatively large gap between the additional stationary shaft to which the electric motor is connected and the opposite stationary shaft, the two other shafts, each supporting a friction element, Allows for easy transition from position to non-working position.

FIG. 6 shows the base plate 1 supporting both fixed shafts 2,5. A sliding retaining plate (not shown) is positioned on the top of the base plate 1, to which both sliding shafts 3, 4 are mounted and guided downwardly through the perforations in the base plate 1. Shaft 2,
3 and 4 support friction elements 22, 23, and 24, respectively, at portions projecting upward from the substrate 1. A belt pulley 1 is attached to each of the parts of the shafts 2, 3, 4, and 5 that protrude downward from the base plate 1.
1, 12, 13, and 14 are attached, and these belt pulleys are arranged in pressure contact with the endless belt 15. An electric motor 16 for driving the shaft is connected to a portion of the shaft 5 extending upward from the base plate 1.

The gap between shaft 5 and shaft 2 is approximately equal to four times the corresponding gap between shafts 2, 3, 4 in the working position. In order to apply the necessary tension to the drive belt 15, guide rolls 20, 21 are positioned between the belt pulleys 12, 13 on the one hand and the belt pulley 14 on the other hand.

The sliding shafts 3, 4, each having a belt pulley 12, 13, are shown in their working position with a solid line and in their non-working position with broken lines 3', 4', 12', 13', respectively, and in this position the threading is not carried out. be.

It will be appreciated that in the arrangement shown, the shafts 3, 4 can be shifted from the working position to the non-working position and that the electric motor 16 and the friction elements 23, 24 are so spaced that they do not interfere with the action of this shaft.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a first specific example of the device of the present invention, FIG. 2 is a plan view of the back side of the device in FIG. 1, and FIG.
The figure is a sectional view taken along line B-B in Figure 1, Figure 4 is a perspective view of another specific example of the device of the present invention, and Figure 5 is a perspective view of the device in Figure 4. , FIG. 6 is a plan view of the back side of yet another embodiment of the device of the present invention. 2, 3, 4...Shaft, 5...Additional shaft, 11, 12, 13, 14...Belt wheel, 1
5...Belt.

Claims (1)

[Scope of Claims] 1. Three parallel shafts positioned at the vertices of an equilateral triangle and each having a friction element, at least one of these shafts being connected to another shaft for threading between the friction elements. It is now possible to shift relative to
In an apparatus for false twisting yarn by imparting a false twist by friction, in which every shaft is provided with its own belt pulley and an endless belt connects all the belt pulleys, an additional shaft with a belt pulley is used. and the additional shaft is provided with respect to the shaft supporting the friction element such that a line connecting the centers of the four shafts of the shaft supporting the friction element and the additional shaft forms a quadrilateral. The four
The two shafts are such that one pair of opposing shafts is shiftable with respect to the other pair of opposing fixed shafts, and the endless belt has a relatively low elasticity so as to connect the belt pulleys of all shafts. A device for false twisting yarn. 2. Device according to claim 1, in which two shafts supporting friction elements and positioned at opposite vertices of a quadrilateral are movable relative to two other fixed shafts. 3. The device of claim 1, wherein the additional shaft is parallel to the shaft supporting the friction element. 4. The additional shaft comprises an idler wheel arranged at right angles to the shaft supporting the friction element and guiding an endless belt connecting each belt pulley. Device. 5. the space between one fixed shaft supporting said friction element and said additional fixed shaft is at least 2.5 times the facing space between the shafts supporting said friction element in the working position; 3. A device according to claim 1, further comprising an idler wheel for the endless belt, each of which is positioned between the belt pulley of the shiftable shaft and the additional fixed shaft. 6. Device according to claim 5, characterized in that the spacing between the two fixed shafts is 4.5 times the facing spacing between the shafts supporting the friction element in the active position.