JPH05209343A - Apparatus for imparting tension to warp yarn - Google Patents

Abstract

PURPOSE:To impart a tension to warp yarns with controlling compressed air consumption by opening and closing a solenoid valve lying between an air tensor and a compressed air source corresponding to a crank angle. CONSTITUTION:An air tensor C is so constructed to impart tension to a yarn A passing through an air flow made in a passing hole 3 by jetting a compressed air from a clearance formed with a conical hole 1a of a nozzle body 1 and a conical hole 2a of a nozzle 2. In a shuttleless loom, a solenoid valve 5 and a check valve 6 are piped in branch to the air tensor C having a yarn A through it and are connected to a compressed air source through a reduced pressure regulator for high tension 7 and that for low tension 8 respectively, and the solenoid valve 5 is so installed to open and close corresponding to a crank angel. When the solenoid valve 5 is opened, an air flow adjusted its pressure by the reduced pressure regulator for high tension 7 is supplied to the air tensor C to give tension to the yarn A and when the solenoid valve 5 is closed, a weak air flow adjusted its pressure by the reduced pressure regulator for low tension 8 is supplied to the air tensor C.

Description

Detailed Description of the Invention

[001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for applying a tension to a weft yarn that is shed when weaving with a loom.

[002]

2. Description of the Related Art In shuttle-looms, a washer type, a gate type, a spring type, or the like, which is provided immediately before wefting of a weft, installs a thread tension applying device to apply tension to the weft. Since all the add-on devices are based on solid friction, the yarn tension becomes unstable due to the accumulation of cotton wool and abrasion of frictional parts, which adversely affects the quality of the fabric.

[003]

According to the present invention, as a yarn tension applying device, compressed air is used to generate an air flow, and a yarn resistance is applied by utilizing a fluid resistance generated by running a weft in the air flow. It is also an object of the present invention to provide a tension applying device capable of minimizing the air consumption by generating the air flow only when the tension is required.

[004]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a conical portion (2a) of a nozzle (2) is fitted into a conical hole (1a) of a nozzle body (1) to create a conical gap, and the screw coupling is adjusted to adjust the conical shape. The conical clearance is made adjustable, the other end of the nozzle piece (3) fitted to the nozzle body (1) is fitted to the tensor body (4), and compressed air is supplied from the piping tube (b). Is reached to the air chamber (1b) of the nozzle body (1), and passes through the conical clearance to form the passage hole (3a).
To generate an air flow, which is guided to the passage hole (4a) and is diffused to the outside. On the other hand, the yarn (a) passes through the passage hole (4a), passes through the passage hole (3a), comes out from the passage hole (2b) to the outside, and tension is applied to the yarn (a).
Make up.

In FIG. 2, the air tensor (c) is branched into a solenoid valve (5) and a check valve (6) for piping, and a high-tension pressure reducing valve (7) and a low-tension pressure reducing valve (8) are respectively provided. Connected to a compressed air supply source. The solenoid valve (5) is opened and closed according to the crank angle of the loom.
It is open only during the period when high tension is required during rotation, and is closed during other periods. Here, when the solenoid valve (5) is open, the compressed air whose pressure has been adjusted by the high tension pressure reducing valve (7) flows into the air tensor (c), creating a strong air flow, and the check valve (6) is low. Prevents backflow to the tension circuit.
When the solenoid valve (5) is closed, the compressed air whose pressure has been adjusted by the low tension pressure reducing valve (8) flows into the air tensor (c), creating a slightly weak air flow.

As described above, since the present invention utilizes the fluid resistance obtained by passing the yarn in the air flow, the above-mentioned drawbacks fatal to the conventional tension applying device using solid friction are eliminated. it can. Further, the air consumption can be minimized by opening and closing the solenoid valve in correspondence with the crank angle and creating the high-tension air flow for the required time during one rotation of the loom.

[0097]

[Brief description of drawings]

FIG. 1 is a front sectional view showing the structure of an air tensor.

[Fig. 2] Piping system diagram of this device

[Explanation of symbols]

 1 Nozzle body 1a Conical hole 1b Air chamber 2 Nozzle 2a Conical part 2b Passage hole 3 Nozzle piece 3a Passage hole 4 Tensor body 4a Passage hole 5 Solenoid valve 6 Check valve 7 High tension pressure reducing valve 8 Low tension pressure reducing valve I Thread piping Tube air tensioner

Claims (1)

[Claims] 1. In a shuttleless loom, compressed air is jetted from a conical gap created by a conical hole (1a) of a nozzle body (1) and a conical portion (2a) of a nozzle (2) to provide a passage hole (3a). ), An air flow is generated in the air flow, and an air tensor (c) that gives a tension to the air flow by passing a thread is connected to a solenoid valve (5) that opens and closes corresponding to the crank angle. A weft tension applying device, which is opened for a necessary period during one rotation of a loom.