JPH0437173B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a weft insertion method in a fluid jet loom, and more particularly to a method for controlling the flying speed of weft threads.

Prior Art In general, in a fluid injection type loom, a weft is injected into a weft guide passage formed by a row of weft guide holes of a large number of weft guide members arranged in parallel on a slay, and the weft is inserted into the weft guide passage. The inserted weft yarn is assisted in its flight by auxiliary nozzles arranged at predetermined intervals along the guide path. This flying condition of the weft threads not only has a great influence on the quality of the woven fabric, but is also a factor that can cause errors in weft insertion, such as when the weft threads jump out of the weft guide path during weft insertion.

Therefore, in order to control the flight of the weft yarn, it is necessary to appropriately control the injection pressure and injection timing in the main nozzle or the auxiliary nozzle, which affect the flight state. Therefore, conventionally, a pair of weft detectors are provided at appropriate positions in the weft guide passage at a predetermined interval, and the flying speed of the weft tip is measured based on the weft detection by both detectors and the machine rotation angle. A method is adopted in which the injection pressure and injection timing are controlled based on the measurement results. Usually, the weft detector is composed of a light emitting/receiving element, and both elements are arranged opposite to the peripheral wall of the weft guide hole of the weft guide member, sandwiching the weft guide hole because of the restriction of non-contact with the warp. However, since it must be assumed that the weft tip flying through the weft guide path can pass through almost the entire area of the guide hole, a plurality of light emitting/receiving elements are arranged opposite each other so that the weft can be detected in almost the entire area of the guide hole. However, it is extremely difficult to mount such a plurality of light emitting and receiving elements due to restrictions such as the shape, size, material, etc. of the weft guide member.

Purpose The present invention has been made in consideration of the above-mentioned problems, and its purpose is to control the flying speed of the weft yarn at multiple times during one weft insertion in areas other than the weft guide path where the contact relationship with the warp yarns is a problem. It is an object of the present invention to provide a weft insertion method for a fluid jet loom, which allows easy measurement step by step, and controls the flight of weft yarns based on the measurement results.

Configuration In order to achieve the above-mentioned object, the present invention detects changes in the amount of stored weft yarns for each predetermined length multiple times during one weft insertion, and determines the flight of the weft yarns for each detection based on the detection results. This method employs a method of detecting the velocity, controlling the jetting conditions of the jetting fluid based on the detection result, and controlling the flight of the weft yarn.

Embodiment Examples 1 to 3 below are examples embodying the present invention.
To explain based on the figure, the weft yarn Y wound around the weft supply section 1 is pulled out while being measured by the length measuring roller mechanism 2, and is ejected by the storage nozzle 3. The ejected weft yarn Y is stored in a storage pipe 5 having a slit 5a on one side to a predetermined length while the weft gripper 4, which opens and closes in synchronization with the rotation angle of the machine, that is, the weft insertion timing, is closed. is stored. Then, at a predetermined timing, the gripper 4 is opened, and the main nozzle 7 on the slay 6 connected to a compressed fluid supply source (not shown) is operated, and the stored weft yarn Y is pulled out from the slit 5a. The weft is injected from the main nozzle 7 into the weft guide path S formed by a large number of weft guide members 8 arranged in parallel on the slay 6 . The weft yarn Y inserted into the weft guide path S is assisted in flight by auxiliary jetting fluid from a plurality of auxiliary nozzles 9 arranged at predetermined intervals along a large number of weft guide members 8. The weft guide member 8 and the auxiliary nozzle 9 are arranged in a plurality of blocks (6 in the illustrated example, 10,1
1, 12, 13, 14, 15), and the auxiliary nozzles 9 of each block 10 to 15
are the fluid passages 10a and 1 provided therein.
It is connected to the compressed fluid supply source (not shown) via 1a, 12, 13a, 14a, and 15a.

In this embodiment, the main nozzle 7 is the electromagnetic valve 1
6. Connected to the compressed fluid supply source via a sub-tank 17 and an electromagnetic pressure controller 18.
Further, the auxiliary nozzles 9 attached to the blocks 10 to 13, respectively, are connected to electromagnetic valves 19, 20, 21, and 21, respectively, provided corresponding to the blocks 10 to 13, respectively.
22 to the sub-tanks 23, and further connected to the compressed fluid supply source via an electromagnetic pressure controller 24. Further, the auxiliary nozzles 9 attached to the blocks 14 and 15 are connected to the sub-tank 27 via electromagnetic valves 25 and 26 provided correspondingly to the blocks 14 and 15, respectively, and are further connected to the sub-tank 27 via an electromagnetic pressure controller 28. and connected to the compressed fluid supply source. and,
The electromagnetic valves 16, 19 to 26 and the electromagnetic pressure controllers 18, 24, 28 are operated based on commands from a control device 29, which is arranged along the slit 5a of the storage pipe 5. The electromagnetic valves 16, 19-22,
25, 26 and pressure controllers 18, 24, 28.

As shown in FIG. 4, a computer 32 (central processing unit CPU, read-only memory ROM, readable and rewritable memory
The preset weft flying speed, the initial pressure value and initial injection timing in the main nozzle 7 and each auxiliary nozzle 9 are inputted via an A/D converter and an input port 33 (not shown). is entered and stored. Then, the computer 32 calculates the flying speed of the weft based on the weft detection signals sequentially inputted from the plurality of weft detectors 30 and the detection signal from the machine rotation angle detection device 31, and also uses the calculated speed and the above settings. The weft flying speed is compared with the determined weft flying speed, and the output is sent to the electromagnetic pressure controllers 18, 24, 28 and electromagnetic valves 16, 19 to 22, 25, 26 via the output port 34 and a D/A converter (not shown). Correction commands are now sent.

In this embodiment, the set weft flying speed is the flying speed corresponding to the weft flying distance curve C within the machine rotation angle range shown by [θ1, θ2] in FIG. 4, that is, the tangential slope of the curve C. has been adopted, and the following
The flying control of the weft yarn according to the set flying speed will be described. Incidentally, FIG. 6 is a block diagram thereof.

When the weft yarn Y is stored in the storage pipe 5 for a predetermined length as shown in FIG. The weft is injected from the main nozzle 7 into the weft guide path S.
Then, an operation command is sent from the control device 29 to each of the electromagnetic valves 19 to 22 in synchronization with the flight timing of the weft yarn Y, thereby assisting the flight of the weft yarn Y. As the weft yarn flies, the bent portion of the weft yarn Y that is pulled out from the slit 5a of the storage pipe 5 and connected to the gripper 4 (FIG. 1) faces from the upper side to the lower side in FIG. As the weft yarns pass through the weft yarn Y sequentially, changes in the storage length of the weft yarn Y due to weft insertion are detected stepwise at a plurality of positions, and a weft yarn detection signal is inputted from each weft yarn detector 30 to the control device 29 . The same device 29
calculates the weft flying speed based on the sequentially inputted weft thread detection signal and machine rotation angle detection signal, and compares and judges the calculated speed with the set weft thread flying speed. The tip of the weft Y is shown in Figure 1.
At the time when the position indicated by TP is reached, that is, the amount of weft yarn Y stored in the direction of the storage pipe 5 is exhausted and the weft yarn Y starts flying while being restrained by the length measuring roller mechanism 2, the weft yarn is detected by the weft yarn detector 30. is completed, and the weft flying after the TP position shifts to a constant speed state as shown by the chain line in FIG.

When the calculated flying speed is larger than the set weft flying speed, the control device 29 issues a correction command according to the calculated flying speed to the electromagnetic pressure controllers 18 and 2.
4, 28, each pressure controller 18, 24, 28
The fluid injection pressure controlled by is corrected by a predetermined amount in the direction of pressure reduction. If the calculated flying speed converges to the set weft flying speed based on this injection pressure correction, the control device 29 maintains this corrected state. If the calculated flying speed does not converge to the set weft flying speed based on this pressure correction, the control device 2
9 is the electromagnetic valve 16, 19 along with the pressure correction.
A correction command for delaying the closing timing is sent to the nozzles 7 and 22, 25, and 26, and the fluid ejection time in each nozzle 7 and 9 is lengthened.

Conversely, when the flying speed of the weft yarn decreases and the weft yarn becomes loose, the control device 29 controls the pressure controller 2
A correction command is sent to the auxiliary nozzle 8 to increase the injection pressure of the auxiliary nozzle 9 from the position indicated by TP in FIG. Then, based on this injection pressure correction, the tension of the flying weft after the position indicated by TP in FIG. 1 is increased, and the loosening of the weft is eliminated.

In this way, when performing weft flight control, the above-mentioned conventional method involves measuring the weft flight speed based on the detection results of the weft yarn detection performed in the weft guide path, where the contact relationship with the warp yarns is a problem. In contrast, in the present invention, weft yarn detection is performed by detecting changes in the weft storage length step by step for each predetermined length in a weft storage section that does not cause any mechanical problems, and by this detection command, weft yarn flight is detected. Velocity measurements are easily made.
Based on these multi-step measurement results, the injection pressure and injection timing of the main nozzle 7 and the auxiliary nozzle 9 are finely corrected to control the flying speed of the weft Y, which improves the quality of the woven fabric and improves the quality of the weft. This greatly contributes to preventing insertion errors.

Further, the present invention may be embodied in a weft length measuring device 35 of the winding length measuring method shown in FIG. Same length measuring device 3
Reference numeral 5 denotes a rotational support shaft 36 operatively connected to a rotational drive source of the machine base, and a spool attached to the support shaft 36 so as to communicate with a thread guide hole 36a provided along the axis of the support shaft 36. a drum 40 that is rotatable relative to the tip of the rotary support shaft 36 and held stationary based on the attractive force of magnets 38 and 39;
It is comprised of a pair of weft locking bodies 41 and 42 that alternately move in and out of the drum 40 once per rotation of the machine and control the length measurement of the weft and its withdrawal in the weft insertion direction. A plurality of (four in this embodiment) light emitting elements 43A are provided on the peripheral surface of the tip end of the drum 40, and a light receiving element 43B is provided on the balloon control body 44 disposed around the drum 40.
is provided facing each of the light projecting elements 43A. Therefore, as the weft Y is drawn out, a weft detection signal is emitted from the light receiving element 43B. Weft insertion 1
If the number of windings of the stored weft yarn per weft insertion is 3, the number of times the weft detection signal is transmitted per weft insertion is 4×3.
Therefore, it becomes possible to measure the weft flight degree in the same manner as in the above embodiment.

Of course, it is desirable to have a large number of pairs of light emitting/receiving elements 43A, 43B, and both elements 43A, 43B may be arranged interchangeably.

Effects The change in the storage length of the weft due to weft insertion is detected step by step, the flying speed of the weft is measured, and fine-grained control is performed based on the measurement results. It has the excellent effect of improving the quality of woven fabric and preventing weft insertion errors.

[Brief explanation of drawings]

1 to 4 show an embodiment embodying the present invention, and FIG. 1 is a schematic front view showing the entire weft insertion device;
Fig. 2 is an enlarged sectional view taken along the line A-A in Fig. 1, Fig. 3 is a block diagram showing the control device, Fig. 4 is a graph showing the flying state of the weft yarn, and Fig. 5 shows another example of the present invention. The partially cutaway side view shown in FIG. 6 is a block diagram showing weft flight control. Main nozzle 7, auxiliary nozzle 9, solenoid valves 1, 6, 19, 20, 21, 22, 25, 26,
Electromagnetic pressure controller 18, 24, 28, control device 2
9. Weft detector 30, light emitting element 43A and light receiving element 43B as weft detector, weft Y.

Claims (1)

[Claims] 1 In a fluid injection loom that stores a predetermined amount of weft in a weft length measuring device and inserts the weft by jetting the weft with a jet of fluid, the change in the amount of weft stored during one weft insertion is measured by a predetermined length. detecting the weft yarn multiple times at each detection position, detecting the flying speed of the weft yarn at each detection position based on the detection result, controlling the jetting conditions of the jetting fluid based on the detection result, and controlling the flying weft yarn. A weft insertion method in a fluid jet loom, characterized by: