CH341417A - Spinning frame draw train - Google Patents

Description

The present invention relates to a drawing train for drawing a sliver or a roving in a spinning frame.

A known drawing line with three rows of rolls generally consists of front rolls or delivery rolls, middle rolls (or sleeve rolls) and back rolls.

In such a drawing train, it was allowed to obtain a partial draw rate between the posterior rolls and the middle rolls up to 1.8 times and a total draw rate up to 30 times.

However, it has been possible to obtain a preliminary stretching of 2.0 to 5.0 times by increasing the pinching force of the posterior cylinders or of the middle cylinders and by placing the said cylinders at a distance from each other equal to 1a length of the fibers implemented. This has therefore resulted in the possibility of obtaining a total draw rate of 40 to 100 times and even more.

Since this result is obtained by a judicious and appropriate adjustment of the cylinders and by overloading the pressure cylinders, the gap between the median cylinders and the rear cylinders must be regulated very strictly according to the length of the fiber to be treated and moreover, this adjustment must be able to be carried out very simply and neatly.

For example, an will obtain particularly favorable results by choosing said spacing as follows

for large issues 31 mm for medium issues 34 mm for thin issues 35.7 mm the cylinders regulated in a very precise way, it is necessary to implement a very vigorous pinging force for the pressure cylinders.

In general, it is common practice to equip the drawing train with a drawing sleeve of the Casa Blancas type on the median rolls in order to obtain suitable operation with a very high total drawing. In this System it is necessary to apply a weight at least twice the usual weight to obtain a sufficiently effective pinging force between the upper and lower sleeves. However, when such a high weight is applied, the sleeves are liable to move laterally, with the consequent inevitable wear of said sleeves.

The main object RTI ID="0001.0269" WI="14" HE="4" LX="1275" LY="1851"> of the present invention is to create a drawing train that does not have the drawbacks cited higher while retaining the aforementioned advantages.

The drawing train according to the invention is characterized in that it comprises a large central cylinder driving a lower drawing sleeve, a central pressure cylinder driving an upper drawing sleeve and a pressure cylinder pinch working in tandem On said large cylinder with lower sleeve, the whole so as to create two stretching zones, the first between said pinch cylinder and the rear cylinders, the second between said middle pressure cylinder with stretcher sleeve and the delivery cylinders.

This arrangement makes it possible to create a high pinging force between the pinch pressure cylinder and the lower sleeve so that it becomes possible to heavily load the pinch pressure cylinder and drive the sleeve by means of the lower cylinder. without any slippage between said cylinders. On the other hand, the middle pressure cylinder does not require the high overload which is necessary to efficiently feed the lower sleeve through the lower cylinder in the usual three-row draw train, So that it is sufficient to have a relatively light weight to rotate the upper sleeve at a speed equal to that of the lower sleeve. Thus, it suffices to apply a weight which is equivalent to 0.5 to 0.8 times the usual filler weight.

The appended drawing shows, by way of example, three embodiments of the drawing train which is the subject of the invention.

fig. 1 is a schematic profile view of a first form of execution.

fig. 2 is an enlarged side view of a stabilizer forming part of this embodiment.

fig. 3 is a plan view of the stabilizer of FIG. 2.

fig. 4. is a schematic side view of a second embodiment of the drawing train provided with a pressure lifting mechanism.

fig. 5 is a schematic side view of a third embodiment.

In the embodiment represented in FIGS. 1 to 3, a lower stretching sleeve 2 is mounted on a large middle lower cylinder 1 and on a tension bar 3.

Above the lower cylinder 1 are arranged a pinch pressure cylinder 4 and a median pressure cylinder 5 entra3nant an upper stretching sleeve 6. These two cylinders 4 and 5 are placed respectively in the vicinity of posterior cylinders 23 and in the vicinity of delivery cylinders 17. A posterior stretching zone is thus formed between the pinging points B and A; the second of the pinching points is located between the two rear cylinders 23 and the first of the res points is located between the pinch pressure cylinder 4 and the lower sleeve 2. front stretching point between the pinging points C and D, the first point C being located between the upper sleeve holder cylinder 5 and the lower sleeve holder cylinder 1 and the second pinging point D being located between the feeder cylinders 17.

With this arrangement, it is possible to obtain an adjustment of the cylinders which is advantageous enough to allow various thread numbers to be spun, provided however that the margin of the adjustment distances does not exceed 12.7 mm. Thus, to make the adjustment at the desired distance RTI ID="0002.0277" WI="10" HE="4" LX="507" LY="2503"> from the rear cylinder, it suffices to adjust the position of the cylinder appropriately. pinch pressure 4 and it is not at all necessary to alter the adjustment positions of the other cylinders. In this drawing train, the positions of the lower drawing cylinders belonging to the front, intermediate and rear rows are permanently fixed and the pressure cylinders belonging to the front and rear rows as well as the intermediate upper sleeve-holder cylinders also have a fixed position. . On the other hand, the adjustment and fixing of the critical position of the rear stretching zone can be carried out easily and quickly: it suffices for this to adjust only the position of the pinching pressure cylinder according to the length of the fibres. to work. These characteristics can be partly applied to the spinning of long fibres. This amounts to saying that, although in the long fiber plane it is impossible to regulate absolutely definitively the position of the rear cylinder as in the plane of the cotton mill, a precise adjustment of the position of said rear cylinders by adjusting the position of the pinch pressure cylinder 4 after having carried out a first rough adjustment of said rear cylinder. In practice, such a fact is extremely valuable for stretching under the most favorable conditions.

The drawing train which has just been described is further improved by the presence of a special stabilizer.

In general, it is impossible to obtain the most favorable results by adopting only a drawing train such as that represented in fig. 1 for the usual three-row drawing because the width of the drawn roving in the posterior zone is too large to obtain satisfactory spinning, although said roving may enter the main airing zone in the form with a wide ribbon.

This drawback is effectively eliminated by the fact that the draw train is equipped with a draw stabilizer arranged so that it can slide freely in the pinging point of the rear cylinders. along the wick feed path and that it can slide between the wick guide funnel and the rear cylinders.

Said stabilizer can bring the wick to the pinching point of the rear cylinders in a width of 1.5 to 2 mm. This amounts to saying that with the entry of the wick into the pinching point of the rear cylinders, the nose of this stabilizer approaches as nearly as possible said pinching point. This bringing together is essential to obtain stretching under the best stability conditions.

This stabilizer is shown in Figs. 1 to 3 where it is seen that the wick is guided in the usual way by a rear funnel 8 so that the pinging point B of the two rear cylinders moves regularly in the longitudinal direction of said cylinders.

In addition to this usual arrangement, the draw train includes a draw stabilizer 7 placed between the feed funnel 8 and the pinch point B of the two rear cylinders. It is preferable in practice to use a stabilizer 7 having a nose 12 whose width is 1.5 to 2 mm so as to provide the rear cylinders with a sufficiently narrow wick.

The pivot 10 of said stabilizer is supported 6 so as to be able to slide freely in a slot 11 of the support 9 of the stabilizer. According to such a construction, the wick which comes to engage in the first pinching point B of the two rear cylinders is introduced there after having been reduced in width by the first beak 12 of the said stabilizer 7; this sliding of the pivot 10 in the slot 11 allows the nose 12 of the said stabilizer 7 to approach the pitching point B of the two rear cylinders as nearly as possible so as to carefully maintain the wick at the said pitching point B at a width which is approximately equal to the width of the nose 12 of the stabilizer. Thanks to the conditions achieved as just described, it is possible to obtain satisfactory spinning with a high airage without the need for any special device capable of making the roving narrower before it reaches the delivery rolls. .

It should be noted that when any part of the draw train is in poor working order, due to the removal of pressure due to insufficient pressure, yarns are obtained whose numbers are irregular and ill-defined. If such an accident occurs, it is much preferable to achieve conditions in which the thread breaks before being spun. Consequently, in the form of execution represented in FIGS. 1 to 3, it is desirable that the pressure exerted on the pressure cylinders belonging to the delivery cylinders, the pinch cylinder and the rear cylinders should be uniformly in the best condition or uniformly raised or even uniformly in an imperfect condition.

This uniformity of the pressure conditions is obtained in the form of execution represented in FIG. 4, in which the same organs as in the example of FIG. 1 are designated by the same reference numbers.

In general, when any spring is compressed from a Normal Good State to a Shorter State, said spring exerts the same forces at both ends.

Thus, in the drawing train shown in FIG. 4, a spring 13 Loads the front pressure cylinder 17 by one of its ends through the of levers 14 and 15 and a pressure hook 16, while it loads at the right other end the pinch pressure cylinder 4 and the rear pressure cylinder 23 respectively via a pressure lever 19, a pressure lifting handle 25, a pressure lever 24, a pressure rod 21 and a saddle 22.

In this way, when a pressure relief mechanism is arranged in one of the parts of the pressure system which has just been described, it becomes possible to remove the pressure exerted on the middle cylinder 5, 1st pressure cylinder 17, 1st pinch pressure cylinder 4 and 1st rear pressure cylinder 23.

In the position represented in fig. 4, in which the pointed end 26 of the pressure-removing handle 25 enters a notch 27 of the pressure lever 19, the pressure cylinders 17, 23 and 4 are held under the pressure of the spring. , but as soon as the tip 26 comes out of the notch 27, the spring 13 pushes the lever 19 into the position shown in phantom. In this position the spring 13 has relaxed and resumed its normal length and its force becomes nil or almost nil, so that all the pressure cylinders 17, 23 and 4 are uniformly freed from all pressure.

As stated above, the feed roll pressure rolls, the pinch pressure roll 4 and the rear pressure rolls can be loaded or unloaded in one section only, except if the spinning machine accidentally starts. , the yarn breaks at the location which is unloaded and the fiber cannot be spun despite the fact that another loaded unit can continue to spin.

The drawing train according to FIG. 4 presents a very short lower stretching sleeve 2. In the form of execution according to FIG. 5, this short lower sleeve is replaced by a much longer sleeve; the operation and other characteristics are identical in the two examples.

Claims (3)

CLAIM Spinning machine drawing train, characterized in that it comprises a large middle cylinder driving a lower drawing sleeve, a middle pressure cylinder driving an upper drawing sleeve and a pressure cylinder clamp working in tandem on said large cylinder with lower sleeve, thereby creating RTI ID="0003.0550" WI="8" HE="4" LX="1573" LY="2178"> two zones of drawing, the first between said pinch cylinder and the rear cylinders, the second between said middle pressure cylinder with a drawing sleeve and the delivery cylinders. SUB-CLAIMS 1. A drawing machine according to claim, characterized in that all of the lower cylinders and the upper cylinders are fixedly adjusted and that only the pinch pressure cylinder is mounted so as to be able to be adjusted. 2. A draw train according to claim and sub-claim 1, characterized in that a draw stabilizer is slidably disposed between the back rolls and a wick guide funnel. 3. Drawing train according to claim, characterized in that it comprises, on the one hand, a pressure spring intended to load by one of its ends the first pressure cylinder and by its other end the first pressure cylinder. rear pressure and, on the other hand, a pressure raising device rises so as to release at the same time the said front and rear pressure cylinders.