JPH0816298B2 - Weft insertion control device in jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of drawing out a weft from a weft length measuring and storing device, inserting the weft from a weft insertion main nozzle, and inserting the inserted weft into a plurality of wefts. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft insertion control device in a jet loom that is pulled by a relay by an injection action of an insertion auxiliary nozzle.

[Prior Art] In this type of jet loom disclosed in Japanese Patent Laid-Open No. 63-282339, the time when the front end of the weft inserted reaches the predetermined position on the weft insertion start side, or the weft insertion end side The time to reach the predetermined position, or the time to reach both the predetermined positions, is detected, and the injection timing suitable for the weft flying state grasped based on the arrival time detection result is selected. . By selecting such an injection timing, an appropriate weft flying state and favorable injection air consumption are achieved.

[Problems to be Solved by the Invention] The injection timing is set in accordance with the arrival time of the weft tip, and the injection timing corresponding to the detected arrival time of the weft tip is selected every time the weft tip arrival time is detected. Used. The injection timing set corresponding to the arrival time of the weft tip is selected so as to obtain an appropriate tension state that provides a good flying posture without the blowout of the weft during weft insertion. It is not guaranteed that the tip arrival time will always converge within an appropriate range. for that reason,
Although the weft flying condition is good, it may happen that the weft tip reaches the predetermined position on the weft inserting end side too late or too early, and the improper arrival of the weft tip may result in weft insertion. Induce defects.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a weft-insertion control device capable of preventing a weft-insertion defect by optimizing the time when a weft yarn tip reaches a predetermined position.

[Means for Solving the Problem] Therefore, in the present invention, an electromagnetic drive type weft drawing-out control means for performing drawing-out control of the weft drawn out from the weft measuring and storing device, and a pressure fluid supply to the weft inserting main nozzle are provided. An electromagnetic valve for controlling, an electromagnetic valve for controlling the supply of pressure fluid to the auxiliary nozzle for weft insertion, and a first weft end arrival that detects the arrival time of the weft end reaching a predetermined weft insertion position on the weft insertion start end side. Timing detection means, second weft tip arrival timing detection means for detecting the arrival timing of the weft tip reaching a predetermined weft insertion position on the weft insertion end side, the weft pull-out control means, and excitation / demagnetization timing of each electromagnetic valve The weft insertion control device is constituted by the timing control means for controlling the weft insertion, and is acceptable based on the weft tip arrival timing detection information from the first weft tip arrival timing detection means. A correction pattern corresponding to each combination unit of the result and the admissibility result grasped from the weft end arrival time detection information from the second weft end arrival time detection means is input and set in advance in the timing control means. The timing control means is provided with a control function for selecting and executing the correction pattern corresponding to the grasped combination unit every time the grasped combination unit is grasped.

[Operation] The timing control means determines the combination unit based on the detection information from the first and second weft yarn tip end timing detection means, and selects and executes the correction pattern corresponding to the calculated combination unit. The combination units are, for example, three states regarding the arrival time obtained from the first weft end arrival time detection means (too early, too late and too late).
And 9 states obtained from the second weft end arrival time detection means and three states regarding the arrival time (too early, too late and too late), and the remaining combination units excluding the combination of the allowed states. A correction pattern is set for each. The selection of the correction pattern is performed until the detection timings of the first and second weft yarn tip arrival timing detection means converge within the allowable range.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a winding type weft measuring and storing device, in which the weft Y measured and stored by the weft measuring and storing device 1 is injected from a weft inserting main nozzle 2 and a weft inserting auxiliary nozzle group is formed.
Passed on to relay injection of 3,4,5,6,7,8,9,10. If the weft insertion is carried out favorably, the weft yarn is detected by the weft yarn detector 11 within a predetermined machine frame rotation angle range, and the loom operation is continued. When the weft yarn detector 11 does not detect the presence of the weft yarn within the predetermined machine frame rotation angle range, the loom operation is stopped.

The unwinding and unwinding of the weft yarn from the yarn winding surface 1a of the weft length measuring and storing device 1 and the stopping thereof are performed by the excitation and demagnetization of the electromagnetic solenoid 12 which drives the locking pin 12a. The excitation / demagnetization control of the electromagnetic solenoid 12 is performed by a command from the control computer C, and the control computer C transmits the electromagnetic solenoid via the drive circuit 14 based on the detection signal from the rotary encoder 13.
Controls 12 demagnetizations. In the vicinity of the yarn winding surface 1a, a weft unwinding detector 15 composed of a reflective photoelectric sensor is provided.
The weft Y unwound from the yarn winding surface 1a is detected by the weft unwind detector 15.

Electromagnetic valve for pressure air injection of main nozzle 2 for weft insertion
Controlled by opening / closing V ₁ , auxiliary weft insertion nozzle groups 3 to 10
The pressure air injection at is the electromagnetic valves V ₂ , V ₃ , V ₄ , V ₅ ,
It is controlled by opening and closing V ₆ , V ₇ , V ₈ , and V ₉ . Solenoid valve V ₁
Is connected to the pressure air supply tank 16 and the electromagnetic valve
V _{2 to} V ₉ are connected to the pressurized air supply tank 17. Opening / closing control of each electromagnetic valve V ₁ , V _{2 to} V ₉ is performed by a command from the control computer C, and the control computer C transmits each electromagnetic valve V ₁ , via the drive circuit 18 based on the signal from the rotary encoder 13. Command the opening and closing of V _{2 to} V ₉ .

The control computer C target weft insertion start timing T ₀ in the data memory C ₁ in the allowable related to the target weft insertion start timing T ₀ error Δ
T ₀ , a target arrival time Tω at which the tip of the weft Y inserted into the weft yarn reaches the installation position of the weft detector 11, an allowable error ΔTω regarding the target arrival time Tω, a standard excitation / demagnetization timing [γ, δ] of the electromagnetic solenoid 12, The standard opening / closing timings [αi, βi] (i = 0 to 9) of the electromagnetic valves V ₁ , V _{2 to} V ₉ are set by the input setting device 19, and the central processing unit CPU
Executes the weft insertion control shown in the flow chart of FIG. 5 based on these input data and the weft insertion control program input and set in the program memory C ₂ . The curves D _{0 in} FIGS. 3 (a) and (b) and FIGS. 4 (a) and (b) are shown.
Represents the ideal flight curve of the weft.

When the machine base rotation angle becomes (α0−δθ) (δθ represents a response delay angle), the control computer C causes the electromagnetic valve V ₁
Is commanded to be released, and immediately thereafter, the electromagnetic solenoid 12 is commanded to be excited. As a result, the winding yarn on the yarn winding surface 1a is pulled out and injected from the weft inserting main nozzle 2 into the weft. When the machine rotation angle reaches (αi−δθ) (i = 1 to 9), the control computer C causes the electromagnetic valve V _i (i = 1 to 1).
9) commanding the opening, and the machine rotation angle is (βi-
Δθ) (i = 1 to 9), the electromagnetic valve V _i (i = 1 to 1)
9) is commanded to be closed, and the weft Y is the auxiliary nozzle group 3 for weft insertion.
It is inherited by ~ 10 relay tow.

The control computer C calculates and stores the weft-insertion start detection time T _0x based on the detected unwinding time grasped from the first unwinding detection signal output from the weft unwinding detector 15. The weft yarn end arrival detection time Tω which is grasped based on the detection signal from the detector 11 is stored. That is,
The weft unwinding detector 15 detects the time when the weft tip reaches a predetermined position on the weft insertion start side to grasp the weft insertion start time, and the weft detector 11 determines when the weft tip reaches a predetermined position on the weft insertion end side. To detect. Control computer C detects weft insertion start
The difference (T _0x −T ₀ ) between T _0x and the target weft insertion start time T ₀ is calculated, and the weft end arrival detection time Tω _x and the target arrival time T are calculated.
Calculate the difference from ω. And the difference T _0x −T ₀ is the tolerance ΔT
If it is within ₀ and the difference Tω _x −Tω is within the allowable error ΔTω, the control computer C uses the same weft insertion control data as the control data for the next weft insertion, that is, standard excitation / demagnetization timing [γ, δ] and standard opening / closing. The timing [αi, βi] is used.

Except when | T ₀ −T ₀ | ≦ ΔT ₀ and | Tω _x −Tω | ≦ ΔTω, there are the following eight combination units.

T _0x −T ₀ ≦ ΔT ₀ , Tω _x −Tω> ΔTω T _0x −T ₀ ≦ ΔT ₀ , Tω _x −Tω <−ΔTω T _0x −T ₀ > ΔT ₀ , Tω _x −Tω ≦ ΔTω T _0x −T ₀ > ΔT ₀ , Tω _x −Tω> ΔTω T _0x −T ₀ > ΔT ₀ , Tω _x −Tω <−ΔTω T _0x −T ₀ <−ΔT ₀ , Tω _x −Tω ≦ ΔTω T _0x −T ₀ <− ΔT ₀ , Tω _x −Tω> ΔTω T _0x −T ₀ <−ΔT ₀ , Tω _x −Tω <−ΔTω The curve D _{1 in} FIG. 3 (a) shows the weft flight curve for the combination unit represented by , A curve D _{2 in} FIG. 4 (a) shows a weft flying curve in the case of the combination unit represented by. When the weft flying is represented by, that is, weft insertion start detection time T
_{When 0x} is within the allowable range [T ₀ −ΔT ₀ , T ₀ + ΔT ₀ ], and when the tip arrival time Tω _x is later than the time (Tω + ΔTω), the control computer C selects the correction pattern P _7. To carry out. The correction pattern P ₇ is the solenoid valve V _{2 to} V ₉
The degaussing timing is delayed by a predetermined angle Δβ, and this correction delays the injection stop timing of the weft-insertion auxiliary nozzle groups 3 to 10 by a predetermined angle Δβ. That is, FIG. 3 (b)
As shown in, the jetting period of the weft-insertion auxiliary nozzle groups 3 to 10 is expanded by a predetermined angle Δβ, and the jetting air amount acting on the weft Y increases. As a result, the flying speed of the weft Y becomes higher than that in the previous weft insertion, and as shown by the curve D ₃ in FIG. 3 (b), the tip arrival detection time Tω _x of the weft Y is within the allowable range [T
ω−ΔTω, Tω + ΔTω].

When the weft flying is represented by, that is, when the weft insertion start detection time T _0x is later than the time (T ₀ + ΔT ₀ ), and the arrival detection time Tω _x is within the allowable range [Tω−ΔTω, Tω + Δ
If it is within Tω], the control computer C selects and executes the correction pattern P ₁ . This correction pattern P ₁ advances the excitation timing of the electromagnetic solenoid 12 by a predetermined angle Δγ, and the excitation timing of the electromagnetic valve V ₁ by a predetermined angle Δγ.
The content of advancing α ₀ and demagnetization timing by a predetermined angle Δβ ₀ is such that the jetting action on the weft Y before the start of weft insertion is accelerated and the weft release timing by the locking pin 12a is advanced. As a result, the weft insertion start detection time T _0x of the weft Y is earlier than that in the previous weft insertion, and the weft insertion start detection time T _0x of the weft Y is within the allowable range [T] as shown by the curve D ₄ in FIG. 4 (b). _{0 −} ΔT ₀ , T
₀ + ΔT ₀ ].

The correction pattern P ₂ shown in FIG. 5 is set corresponding to the flying state represented by, the correction pattern P ₃ is the flying state represented by, the correction pattern P ₄ is the flying state represented by, and the correction pattern P ₅ The flying state represented by, the correction pattern P ₆ is set corresponding to the flying state, and the correction pattern P ₈ is set corresponding to the flying state represented by. Each of these correction patterns P ₂ , P ₃ , P ₄ ,
Similar to the correction patterns P ₁ and P ₇ , P ₅ , P ₆ and P ₈ are such that the weft insertion start time of the weft Y or the arrival time of the weft tip is corrected so as to converge to the above-mentioned allowable range. And
The control computer C selects and executes a correction pattern corresponding to each detection of each combination unit represented by. Therefore, the flight state of the weft Y is corrected so that the weft insertion start time and the weft end arrival time converge within the allowable range, and as a result, the weft flight curve approaches the ideal weft flight curve D _0. become. As a result, good weft insertion is achieved.

Of course, the present invention is not limited to the above-mentioned embodiment, and for example, the weft insertion start time or the weft yarn tip arrival time is not three stages of too early, permissible and too late, but rather regions of too early and too late are plural regions. An embodiment in which the correction pattern is set separately for each area is also possible.

Further, the present invention can be applied to a jet loom equipped with an air pool type weft measuring and storing device as disclosed in Japanese Utility Model Publication No. 60-162838.

[Effects of the Invention] As described in detail above, according to the present invention, the weft insertion start time is grasped from the arrival time of the weft tip reaching the predetermined weft insertion position on the weft insertion start end side, and the predetermined weft insertion end side is determined. Since the arrival time of the weft end reaching the weft insertion position is grasped, and the correction pattern corresponding to each combination unit of the acceptability results grasped from each detection information is selected and executed, the actual weft The flying state comes close to the ideal flying state, and this has the excellent effect that good weft insertion can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment embodying the present invention. FIG. 1 is a schematic front view, FIG. 2 is a schematic front view showing a state during weft insertion, and FIG. (A) is a graph showing a delayed state of the weft insertion start time, FIG. 3 (b) is a graph showing an excitation / demagnetization timing for correcting the delayed state of the weft insertion start, and FIG. 4 (a) is a delay of reaching the weft tip. Fig. 4 (b) is a graph showing the state, Fig. 4 (b) is a graph showing the excitation / demagnetization timing for correcting the delayed state of arrival of the weft tip, and Fig. 5 is a flow chart showing the weft insertion control program. Main nozzle 2 for weft insertion, auxiliary nozzle groups 3 to 1 for weft insertion
0, electromagnetic solenoid 12 as weft pull-out control means,
Electromagnetic valves V _{1 to} V ₉ , a weft unwinding detector 15 as a first weft tip arrival detection means, a weft detector 11 as a second weft tip detection means, and a control computer C as a timing control means.

Claims (1)

[Claims] 1. A jet loom in which a weft is pulled out from a weft measuring and storing device and is injected from a main nozzle for weft insertion, and the weft inserted therein is relay-pulled by a jetting action of a plurality of auxiliary nozzles for weft insertion. In the weft measuring and storing device, an electromagnetic drive type weft withdrawing control means for controlling the withdrawal of the weft, an electromagnetic valve for controlling the pressure fluid supply to the main nozzle for weft insertion, and an auxiliary nozzle for the weft insertion A plurality of electromagnetic valves for controlling the supply of the pressure fluid, a first weft end arrival time detection means for detecting the arrival time of the weft end reaching a predetermined weft insertion position on the weft start end side, and a predetermined weft end end side Second weft end arrival timing detection means for detecting the arrival time of the weft end reaching the weft insertion position, the weft pull-out control means, and the excitation of each electromagnetic valve. And a timing control means for controlling the magnetic timing, the acceptance / rejection result grasped from the weft tip arrival timing detection information from the first weft tip arrival timing detection means, and the weft from the second weft tip arrival timing detection means. A correction pattern corresponding to each combination unit with the admissibility result grasped from the tip arrival time detection information is input and set in advance in the timing control means, and the grasped combination unit is grasped every time the combination unit is grasped. A weft-insertion control device in a jet loom in which the timing control means is provided with a control function of selectively performing a correction pattern corresponding to the above.