JPS6220465Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a weft insertion device in a jet room, which is equipped with a weft storage section that stores weft yarns shorter than one pick length using an air pool method.

BACKGROUND TECHNOLOGY In general, in a jet room, the weft yarn is temporarily stored in the weft storage section after passing from the weft supply section through the weft length measurement section, and is loaded into the warp opening by being carried by a jet fluid such as air jetted from a main nozzle. I'm starting to do that. As a conventional weft storage device, the first
As shown in the figure, a so-called air pool stores the weft yarn Y whose length has been measured by a weft length measuring section (not shown) in a substantially U-shape in the weft yarn storage section 2 by the air flow jetted from the storage fluid injection device 1. There is a method. In a weft insertion device that is equipped with this type of weft storage device and that continuously measures the length in the weft length measuring section, the weft yarn Y having a length of approximately 2/3 of one pick is stored in the weft storage section 2. . At the time of weft insertion, the gripper 3 releases the weft Y held between the grippers 3 and the thrust of the fluid jetted from the main nozzle 4. The weft Y stored in the weft storage section 2 is first conveyed into the weft guide and stored there. After the weft yarns Y are exhausted, the weft yarns Y whose lengths have been continuously measured by the weft length measuring section are sequentially fed into the weft guide.

FIG. 2 is a diagram showing changes in the state during weft insertion, with the vertical axis representing the weft insertion length and the horizontal axis representing the crank timing. At point A, the gripper 3 releases the weft yarn Y, at point B, the weft Y stored in the weft storage section 2 is exhausted, and at point C, the gripper 3 releases the weft yarn Y.
The weft yarn Y is gripped by the weft Y, and one weft insertion is completed. That is, the weft Y stored in the weft storage section 2 is conveyed according to the speed curve A-B, and the weft Y whose length has been continuously measured in the weft length measuring section thereafter is conveyed according to the speed curve B-C. Since the weft yarn Y is conveyed along the weft line, a sudden speed change occurs at point B, that is, the point where the pool length of the weft Y is 0 (the timing at this time is Tp). This rapid speed change (pool shock) occurring in the weft storage section 2 causes vibrations to be applied to the weft Y, and the waves of vibration spread to the tip of the weft Y, causing weft insertion errors.

Purpose This invention was made in order to eliminate the above-mentioned defects in the conventional device, and its purpose is to prevent the vibrations applied to the weft yarn by the pool shock during weft insertion from spreading to the weft tip, To provide a weft insertion device in a jet room that can prevent weft insertion mistakes caused by a pool shock.

Embodiment An embodiment embodying this invention will be described below with reference to FIG. A storage fluid ejecting device 1 is fixed to a plane L-shaped bracket 5 fixed to a machine stand (not shown) so that the tip of a nozzle 1a faces the weft storage section 2. A fluid ejecting device 6 as a deflecting device is fixed to the bracket 5 so as to be located between the weft storage section 2 and the gripper 3. The fluid injection device 6 has a fluid distribution hole 8 whose open end is sealed by a screw 7, and a fluid distribution hole 8 whose open end is sealed by a screw 7, and a pipe line 9 through which a pressure fluid supplied from a pressure fluid source (not shown) is inserted into the fluid injection device 6 at a nearly right angle to the traveling direction of the weft yarn Y. A plurality of injection holes 10 communicate with the distribution hole 8 so as to spray in a direction.
is formed.

Further, a cover 11 that covers the injection hole 10 side is fixed to the fluid injection device 6, and fixed guides 12 are provided on both the front and rear sides of the cover 11. Said cover 1
A discharge port 13 for discharging a part of the fluid injected from the injection hole 10 is formed in a wall surface 11a facing the injection hole 10 of the first embodiment. A valve 14 and a cam 15 for actuating the valve 14 are disposed in the middle of the pipe line 9 that connects the fluid injection device 6 and a pressure fluid source (not shown). Further, a tank 16 is provided in the middle of the pipe line 9 that connects the main nozzle 4 and the pressure fluid source. A pipe line 9 communicating with the storage fluid ejection device 1 and the fluid ejection device 6
and a pressure reducing valve 1 in the pipe line 9 communicating with the tank 16.
7 and 18 are respectively provided to supply fluid at a predetermined pressure. Also, main nozzle 4
A valve 19 and a cam 20 that actuate the valve 19 in accordance with the weft insertion timing are disposed in the middle of the pipe line 9 that connects the weft and the tank 16.

Next, the operation of the device configured as described above will be explained. Now, when inserting the weft, gripper 3
At the same time, the weft yarn Y that has been clamped is released, fluid is jetted from the main nozzle 4, and the weft yarn Y is conveyed into the weft guide by the jetted fluid. When the weft temporarily stored in the weft storage section 2 runs out, that is, at timing Tp when the pool length is 0, the valve 14 is kept open by the cam 15, which is driven in time with the weft insertion action. The fluid is ejected from the ejection hole 10 of the fluid ejection device 6. Because the weft yarn Y is deflected by the action of the fluid injected from the injection hole 10 and is pressed against the wall surface 11a provided at a position facing the injection hole 10,
The vibrations applied to the weft Y by the pool shock generated at the timing Tp when the pool length is 0 are alleviated, and the vibrations are prevented from spreading to the weft ends. The timing of fluid injection by the fluid injection device 6 is not limited to the time from the time Tp when the pool length is 0 to the end of weft insertion, but may be stopped before the end of weft insertion.

Further, in this embodiment, since the discharge port 13 is formed in the wall surface 11a provided at a position facing the injection hole 10, the weft yarn Y is easily deflected toward the wall surface 11a.

Another Embodiment Next, another embodiment will be described with reference to FIG. In this embodiment, the configuration of the fluid ejecting device 21 is different from the previous embodiment. That is, the fluid ejecting device 21 includes a nozzle body 22 fitted to the bracket 5.
and a weft introducing needle 23 fitted into the axial center thereof. A discharge hole 25 is formed in the nozzle portion 24 and communicates with the outside air through a notch 5a provided in the bracket 5. Further, the tip of the nozzle portion 24 is arranged so as to be directed toward the gripper 3.

In this device, the cam 15 is operated only near the timing Tp when the pool length is 0, when the pool shock occurs.
Due to this action, the valve 14 is opened and fluid is injected. A part of the fluid supplied from the pressure fluid source is discharged to the outside from the discharge hole 25, so that the weft yarn Y is deflected toward the discharge hole 25 and pressed against the inner wall of the nozzle portion 24. Therefore, as in the previous embodiment, the vibrations applied to the weft Y by the pool shock are alleviated, and the vibrations are prevented from spreading to the weft ends.

Furthermore, since the gripper 3 clamps and releases the weft yarn Y at a very high speed, it is easy for the generation and adhesion of fluff. When the fluff adheres to the gripper 3, the gripping action of the gripper 3 weakens, and the fluff is carried by the weft Y to the main nozzle 4 and clogs the nozzle, causing inconveniences. Since the fluid is injected toward the gripper 3, the fluff on the gripper 3 is removed, and the above-mentioned inconvenience does not occur.

Note that this invention is not limited to the above-mentioned embodiments; for example, as shown in FIG. At the same time, the fluid is injected from the through hole 26 at the timing Tp when the pool length is 0, the suction action by negative pressure is used as a means to deflect the weft yarn Y toward the contact surface, and the opening/closing operation of the valve 14 is controlled. It is also possible to arbitrarily change the shape, structure, etc. of each part without departing from the spirit of the invention, such as by using a solenoid.

Effects As detailed above, this invention creates a weft contact surface between the weft storage section of the air pool system and the main nozzle, close to the flying path of the weft stored in the weft storage section during weft insertion. In addition, by providing a deflection device that deflects the weft by the action of fluid from around the timing Tp when the pool length is 0 during the weft insertion period, the vibrations applied to the weft by the pool shock are alleviated, and the vibrations reach the weft ends. Since this prevents the spread of force, weft insertion errors caused by the pool shock can be reduced, and the magnitude of the force acting on the weft can be easily controlled by adjusting the valve opening or fluid pressure. It has excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a conventional device, FIG. 2 is a diagram showing changes in weft speed during weft insertion, and FIG. 3 is a partially cutaway schematic plan view showing an embodiment of this invention. FIG. 4 is a partially cutaway schematic plan view showing another embodiment, and FIG. 5 is a partially cutaway plan view of a main part showing a modified example. Weft storage section 2, gripper 3, main nozzle 4,
Fluid injection device 6, 21, injection hole 10, wall surface 11
a. Timing Tp with valve 14, cam 15, weft Y, and pool length 0.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a jet room equipped with a weft storage section that stores weft yarns shorter than the length of one pick using an air pool method, between the weft storage section and the main nozzle, the weft yarns are stored in the same weft storage section. A weft contact surface is provided close to the flying path of the weft thread during weft insertion, and the weft thread that flies during the weft insertion period from around the timing Tp when the pool length is 0 to the end of weft insertion is brought into contact with the weft thread. A weft insertion device in a jet room, characterized in that it is provided with a deflection device that deflects the weft toward the surface side by the action of fluid. 2. The utility model registered in claim 1, wherein the deflecting device is a fluid ejecting device that includes an ejection hole oriented in a direction substantially perpendicular to the traveling direction of the weft yarn and ejects fluid at the timing. Weft insertion device. 3. Claims for registration of a utility model, characterized in that the contact surface is a wall surface disposed at a position facing the injection hole of the fluid injection device, and a fluid discharge port is formed in the wall surface. The weft inserting device according to item 2. 4. The deflection device includes a weft introducing needle,
This is a fluid ejecting device in which a discharge hole communicating with the outside air is formed in a nozzle portion in front of the tip of the weft introducing needle, and the nozzle tip is disposed so as to face the gripper, and the contact surface is connected to the exhaust hole. The weft inserting device according to claim 1, wherein the weft insertion device is the inner wall surface of the nozzle on the formed side. 5. Utility model registration claims 2 to 4, characterized in that the pipeline connecting the fluid injection device and the pressure fluid source is provided with a valve that is operated by a cam in accordance with the timing. The weft insertion device according to any one of the above.