JPH02243473A - Yarn suction device for spinning frame - Google Patents

Abstract

PURPOSE:To prevent any yarn entanglement or the like due to turbulence of an air current in a slack tube by installing a pressure regulating value in an edge at the opposite side to a suction source of a suction duct connecting each base of plural number of slack tubes. CONSTITUTION:At time of ending, yarn ends at both spinning and winding sides are drawn out and this ending is carried out by an ending device, but the spinning side yarn end is continuously spinned, so that it is sucked in plural numbers of slack tubes 1 connected to a suction duct 2 by a suction blower 6 connected via a dust box 5. Since these slack tubes 1 require stable wind speed, namely, stable static pressure in the suction duct 2 when inhaling the yarn end, a pressure regulating value 8 is set up in the other end of the suction duct 2 via a seal tape 10, maintaining the specified static pressure. Thus, entanglement, intertwinement, kinkiness or the like of yarn being left behind in suction in the slack tubes can be prevented from occurring.

Description

[Detailed description of the invention] [Industrial application field]

The present invention provides a system for suctioning and retaining spun yarn in order to avoid fluctuations in yarn tension that occur when the spun yarn is not wound up during yarn splicing or when it is wound into a cone package. The present invention relates to a suction device for suctioning air inside a slack tube to be used. BACKGROUND ART 1 In a spinning device, for example, a binding spinning device, following a draft device that drafts a sliver, the drafted a
An air injection nozzle for heating the fiber bundle is provided, and the yarn exiting the air injection nozzle is wound up by a winding device via a delivery roller, a slab catcher, etc. When a yarn defect is found with the slub catcher, the yarn is cut and spliced by the splicing device, but while splicing the yarn end on the spinning side and the yarn end on the package side, the spun yarn ends is being sucked into the slack tube. One slack tube is provided for each spinning unit, and has a suction flow path with a flat cross section that is long in the vertical direction. There are types with a section provided with a section, and types with an enlarged cross section so that the flow rate gradually increases toward one end. The tip of the slack tube is open to face the yarn running trajectory between the delivery roller and the slab catcher, and the base is open and supported within a suction duct common to each slack tube. The suction duct is connected to a suction source such as a suction blower, and during yarn splicing, each slack tube uses the suction force of the suction blower to suction the yarn end on the spinning side connected to the yarn splicing device from the end opening and slacken it. The thread is suctioned and stored in the tube in an inverted U shape. The yarn stored in the slack tube rides on the suction airflow inside the tube, and its tip is bent into a U-shape. The U-shaped portion at the tip of the stored thread that is being suctioned and stored may exhibit a pointed state, and the two threads may come close to each other and appear entangled with each other.

[Problem to be Solved by the Invention 1] In view of the above points, the present invention maintains the pressure in the suction duct to which a large number of slack tubes are connected constant, thereby reducing the pressure in each slack tube without fluctuation. By keeping it constant, the purpose is to prevent the end of the suction insulation yarn in the slack tube from becoming deformed or becoming entangled. [Means for solving the problem 1 Action] During yarn splicing, the spinning side yarn end and the winding side yarn end are pulled out respectively and the yarn splicing device performs the yarn splicing, but during the yarn splicing operation, the spinning side yarn end is continuously spun. Because of this, it is sucked into the slack tube. Since the slack tube is connected to a suction source such as a suction blower, the static pressure within the slack tube depends on the static pressure of the suction duct. Since the suction duct is provided with a pressure regulating valve at the end opposite to the suction source, the pressure inside the suction duct is kept constant, and the static pressure inside the slack tube is kept constant. This eliminates the generation of airflow within the slack tube that would tangle the bent ends of the threads stored within the slack tube.

【Example】

An example of implementation of the device of the present invention will be described below with reference to the drawings. For each unit, a slack tube 1 is provided with its open end positioned along the yarn travel locus at a position closer to the spinning side than the yarn splicing device (not shown), and its base is connected to the suction duct 2. Provided with an opening inward. The slack tube 1, whose proximal end surface is shown in FIG. Some parts have the same cross section, and others have various cross sections, such as those whose width increases as they approach the ends. The suction duct 2 is provided on the back side of the spinning machine base along the longitudinal direction of the machine base. Therefore, as shown in Figure 1,
Slack tube 1 installed in parallel for each unit
Bend and extend the vicinity of the base of the slack tube 1 by 90 degrees, insert the end into the suction duct 2, and suction the slack tube 1 in such a state that the direction of the branched flow sucked from the slack tube 1 faces the longitudinal direction of the suction duct 2. It is fixed to the duct. The suction duct 2 is connected via a dust box 5 to a suction blower 6 which serves as a suction source. 7 is a motor for rotating the suction blower 6. A pressure regulating valve 8 is provided at the end of the suction duct 2 opposite to the suction blower 6. When the static pressure inside the suction duct 2 drops below a predetermined pressure, the pressure regulating valve 8 opens and the suction blower 6 is constantly removed. The static pressure inside the duct 2 is kept constant. The guy pressure regulating valve 8 is constructed as follows. The end of the suction duct 2 is closed and the valve box 9 is attached. A sealing tape 10 is attached to the joint between the valve box 9 and the suction duct 2. The valve box 9 has an intake port 1 on the side.
1 is integrally provided, and a valve seat 13 is provided at the boundary between the cylinder 12 and the valve box 9. The valve seat 13 forms a tapered flow path that widens toward the valve box 9. A valve rod 15 is supported by a guide member 14 in the cylindrical body 12 so as to be vertically slidable. A valve body 16 corresponding to the valve seat 13 is provided at the end of the valve stem 15, and the valve seat 13 and the valve body 16 come into contact with each other as the valve stem 15 moves up and down. A spring 17 is inserted into the valve stem 15. The spring 17 has one end in contact with the guide member 14 and the other end in contact with the spring receiver 18, and the position of the spring receiver 18 is aligned with the valve rod 15.
Adjustment is made by an adjusting nut 20 screwed into the threaded portion 19 of. Since the valve stem 15 is always urged to move upward in FIG. 2 by the elastic force of the spring 17, the valve body 16 comes into close contact with the valve seat 13, preventing outside air from entering the valve body. The opening and closing pressure of the valve body 16 is controlled by the adjusting nut 20.
is determined by adjusting the position of The apparatus of the present invention has the above-described structure, and the slack tube 1 must constantly maintain a static pressure, for example, minus 300 MAQ, to obtain a stable wind speed when suctioning the yarn end from the opening at its tip. Therefore, by turning the adjusting nut 20 and adjusting the position so that the regulating valve 8 opens when the inside of the suction duct reaches a predetermined static pressure, the pressure inside the suction duct 2 is adjusted to below the predetermined pressure. Decrease (decrease here means duct 2
(This means that the internal pressure has fallen below -300ttunAQ, indicating that the thread suction force into the stick tube 1 has become stronger.) Then, the external air presses the valve body 16 against the valve seat 13 by the spring 17. Overcoming the force, the valve body 3 is pushed down as shown in FIG. Increase the static pressure inside the suction duct 2 and stick tube 1 (bring it closer to atmospheric pressure). When the predetermined pressure is reached, the valve stem is pulled up again by the elastic force of the spring 17, and the valve body 16 is turned into a valve! ! i!
13, and entry of outside air from the intake port 11 is stopped. In the above operation, the suction blower 6 is designed to have a capacity such that the static pressure within the suction duct 2 can be reduced to a degree higher than the target value at all times. The opening of the slack tube 1 on the side facing the yarn path is kept open at all times, and in addition to sucking the spun yarn that accumulates during yarn tying as described above, it is also used to resolve fluctuations in yarn tension that occur during regular spinning operation. In order to moisten the yarn, it is also possible to keep the thread in a steady state of running under suction. In addition, the pressure regulating valve is not limited to the one shown in the second diagram, but a damper opening/closing type or an opening/closing valve type is also possible.
In the one shown in the second figure, since the valve body 16 and the valve seat 13 are conical, the valve can be opened and closed smoothly even by minute pressure changes, and the valve body 16 and the valve seat 13 are The valve shown in the second figure is most suitable for the present invention because the change in the flow rate of air flowing between the valves 19 and 19 is smooth and the airflow flowing into the valve 19 does not become turbulent. Furthermore, the mounting position of the pressure regulating valve to duct 2 is
If the duct 2 is long enough, it does not need to be at the end of the duct, and if the duct 2 is extremely long, one pressure regulating valve may be provided at the end, and an auxiliary pressure regulating valve may be provided in the middle. . [Effects of the Invention] In the device of the present invention, the bases of a plurality of slack tubes are connected, and a pressure regulating valve is provided on the side opposite to the suction source of the suction duct connected to the suction source. Change in number. Even if the pressure inside the suction duct changes due to filter clogging or other causes, the pressure regulating valve installed at the end of the suction tube will immediately operate, preventing the static pressure from becoming unstable. The airflow flowing through the tube does not cause any turbulence due to pressure changes within the suction duct, and there is no tangle, tangle, or tear in the threads that are being sucked and kept warm in the slack tube, which are caused by turbulence in the airflow within the slack tube. etc. can be prevented from occurring.

[Brief explanation of drawings]

The drawings show an example of the implementation of the device of the present invention, and FIG. 1 is a perspective view, and FIG. 2 is a sectional view of a pressure regulating valve. 1...Slack tube. 2...Suction duct.

Claims (1)

[Claims] 1. The bases of multiple slack tubes are connected,
A yarn suction device for a spinning machine, characterized in that a suction duct connected to a suction source is provided with a pressure regulating valve on the side opposite to the suction source.