JPS5911702B2 - Air tightening device for continuous running yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for tightening a continuous yarn using compressed air.

More specifically, this device is designed to tighten fiber threads.

Processing of fiber yarns such as bleaching and dyeing has long been carried out using bobbins or yarn skeins, but it is well known that it is advantageous to use continuous yarn processing methods and equipment in terms of both processing quality and production speed. be.

Most of these treatments are carried out continuously, either as an intermediate treatment step or as a final treatment step, and require complete tightening of the yarn.

Many devices have been proposed, and some that use circulating airflow in close proximity to the yarn are well known.

In general, the yarn was not guided well and came into contact with various machine parts, resulting in tearing, creating small fiber bundles, and damaging the properties of the yarn.

Furthermore, these devices generally require very high air pressures to provide efficient tightening, are expensive, and may not be good for the yarn.

Textile yarn means a flexible article, the cross section of which has a small size relative to its length, whether natural or man-made, continuous or discontinuously formed fibers. belongs to.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a device for air tightening of fiber yarns that is efficient at low operating pressures and does not damage the yarns.

To achieve this purpose, the device comprises a generally conically shaped clamping chamber for axially transversing the thread, the thread entering from the end where the chamber's cross section is the largest. It is configured to discharge from one end.

Compressed air is supplied to the chamber from a pipe that is in contact with the inner wall of the chamber and opens at the part where the cross section of the chamber is maximum, creating a spiral motion similar to that of a cyclone.

The inlet orifice for entering the thread into the chamber is 6-necked.

The outlet orifice is preferably constituted by a tube which axially surrounds the thread in a portion of the chamber and has the function of guiding and protecting means.

Depending on the type of yarn to be processed, the tangential feed is carried out in such a way that air circulates in the chamber either in the direction of rotation S or 2.

Thread 1 traverses the device in the direction of the axial arrow with this tightening.

The device essentially consists of a chamber 2 with an inlet orifice 3 and an outlet orifice 4 for passing the thread, the orifices being axially aligned.

This chamber 2 has a substantially conical shape. The inlet orifice 3 is provided at the smallest cross section of the chamber 2 and has a "waist-shaped" shape, and the diameter of the neck portion is close to the diameter of the system to be treated.

The outlet orifice 4 is provided in the largest cross section of the chamber 2 and is actually constituted by a capillary tube 5.

This capillary tube is arranged in the chamber 2 on its axis in a portion of the path through which the yarn passes through the chamber and is designed to surround the yarn.

This inner diameter is close to the inner diameter of the system to be processed, and its function will be described later.

This chamber 2 is equipped with a vibrotube which is open in the area of maximum cross section of the chamber, and this pipe is the outlet area for the thread.

This pipe is almost in contact with the inner wall of chamber 2.

Its axis is preferably perpendicular to the axis of the chamber.

This pipe is connected to a compressed air supply device (not shown).

The end where the cross section of the chamber 2 is the smallest is the "neck-shaped" part 3
It is connected to the recovery chamber 7 by.

This collection chamber may be of any shape and is equipped with a pipe 8 for discharging the articles which have become detached from the thread 1 by tightening, and which are then recycled.

The yarn 1, which has already undergone an impregnating treatment, for example from a dye bath, is driven through the device for tightening according to the invention by means of a device not shown.

After traversing the collection chamber T, the thread passes through the inlet orifice 3 and enters the chamber 2.
go inside.

After traversing the chamber 2, the thread leaves the exit orifice 4 after traversing the tube 5.

Compressed air is supplied to the chamber 2 by a vibro.

Other fluids may be used as long as efficient clamping or handling can be ensured.

Due to the tangential supply to the conical chamber 2, the air becomes a thin flow and escapes from the neck 3 having a ``flange'' shape.

The rotation direction becomes S or Z-shaped depending on the position of the vibro.

As occurs in a cyclone, this air portion circulates backwards along the axis of the chamber and attempts to escape from the orifice 4.

Part of this effect is suppressed by the presence of the capillary tube 5 and by the small internal diameter of the capillary tube set by the treated system.

The air escaping from the neck section 3 at this point produces an efficient thread tightening, which is further facilitated by the widening section at the entrance to the collection chamber 70.

Furthermore, the residual moisture in the yarn is carried along with the airflow escaping through the outlet orifice 4, so that it is completely clamped at the outlet of the chamber 2.

The tube 5 plays a very important role in practice.

As outlined above, the tube 5 limits the amount of air escaping from the orifice 4, thereby providing a good clamping at the inlet orifice 3.

Furthermore, the tube 5 reliably guides the thread into the chamber 2 and keeps it on the axis of the thin flow.

This prevents rotation of the thread and contact with the inner surface of the chamber 2, which is considered harmful.

Furthermore, the yarn is protected from the action of compressed air when it enters the chamber 2 and is not yet rotating.

In fact, without this tube, the action of the compressed air on the thread would tear the surface fibrils, bunching them up into rings, rotating inside the chamber, and eventually clogging the thread passage.

By selecting S or bidirectional rotational motion, which is set depending on the type of system to be treated, the thread and tightening can prevent deterioration of the device.

The length of the tube 5 is determined by the pressure of the compressed air, the running speed of the yarn, the speed of the predetermined tightening, the shape of the chamber, and the diameters of the air inflow and outflow ports.

Even at very high yarn running speeds of 800 to 1000 meters per minute, a compressed air supply pressure as low as 1 bar is sufficient for correct tightening to obtain the speed.

Furthermore, the tightening speed can be easily modified by changing the compressed air pressure.

The threads are not damaged because the fibrils on the surface are not torn and they do not come into contact with the mechanical parts of the device.

It goes without saying that the invention is not limited to the embodiments described above, but includes all variants of the invention.

Next, some examples of embodiments of the present invention will be listed.

(1) In the device described in the claims, a patent characterized in that the lower orifice is shaped into a 6-necked shape (2) In the device described in the claims, the exit orifice is arranged in an axial direction A device characterized in that it is constructed as a part of the passage through which the thread inside the chamber passes, by means of a tube that extends into the chamber.

(3) The device according to the claims, characterized in that the tangential supply to the chamber is performed in the rotational direction S.

(4) The device according to the claims, characterized in that the tangential supply to the chamber is performed in the rotational direction Z.

[Brief explanation of the drawing]

The drawing is a schematic illustration of an air clamping device according to the invention. 1... Thread, 3... Entrance orifice, 2
...Chamber, 4...Exit orifice, 5.
... Capillary, 6 ... Pipe, 7 ...
・Recovery room.

Claims (1)

[Claims] 1 substantially conical forming an inlet orifice 3 and an outlet orifice 4, each aligned with the axis of the chamber and provided at the end where the chamber cross-section is the smallest and at the end where the chamber cross-section is the largest, respectively; A device for air tightening of a continuous running yarn is provided with a chamber 2 for tightening the shape and a vibro for supplying fluid to the chamber, and the cross section of chamber 2 is the largest. The outlet orifice 4 is connected to a tube 5 extending in the axial direction of the chamber 2 as a part of the path through which the thread passes through the chamber 2.
The inlet orifice 3 provided at the end where the cross section of the chamber is the smallest is connected to the outlet orifice 4 and a diverging collection chamber 7 in the opposite direction, whereby the inlet orifice 3
The pipe 8 for discharging substances separated from the continuous running yarn is arranged almost perpendicular to the running direction of the yarn near the connection part with the inlet orifice 3 of the collection chamber γ. , a continuous running yarn air tightening device.