JPH0424245A - Weft inserting controller in jet loom - Google Patents

Abstract

PURPOSE:To inhibit reduction of measuring accuracy by judging a timing attaining a count number of detected pulse signal within a fixed period in one rotation of a machine obtained from a weft detector to a fixed number as a weft arriving timing. CONSTITUTION:A number of detected pulse signal within a fixed period in one rotation of a machine obtained from a weft detector 11 detecting weft Y arriving at a weft inserting position is attained to a previously fixed number and the timing is judged as a weft arriving timing by a controlling computer C as a judging means of existence of weft.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention involves pulling out a weft from a weft length measuring and storage device, injecting the weft from a main nozzle for weft insertion, and transferring the inserted weft to a plurality of wefts. This invention relates to a weft insertion control device in a jet loom that pulls a relay by the jet action of an auxiliary insertion nozzle.

[Prior art] In this type of jet loom, it is important to achieve a good weft insertion condition in which the weft reaches a predetermined weft insertion end position at a predetermined timing in order to weave a high-quality woven fabric. In order to reach the weft insertion nozzle at a predetermined timing, it is necessary to appropriately set the injection pressure or injection timing of the weft insertion nozzle.

Therefore, it is necessary to accurately measure the weft arrival timing, and as disclosed in Japanese Patent Publication No. 64-494, the detection signal level obtained from the weft yarn detector must be set within a predetermined period during one rotation of the machine. A common method is to use the first time the threshold is exceeded as the weft arrival timing.

[Problems to be Solved by the Invention] However, a device composed of a weft yarn detector may generate not only a weft detection signal but also a fluff detection signal or a noise signal. If the weft detection signal is output before the weft detection signal, the detected weft arrival timing may be significantly different from the actual weft arrival timing. If such a measurement error occurs, it is impossible to set an appropriate injection pressure or injection timing, and a good weft insertion state cannot be achieved.

SUMMARY OF THE INVENTION An object of the present invention is to provide a weft insertion control device in a jet loom that can avoid deterioration in measurement accuracy of weft arrival timing even when there is a fluff detection signal or a noise signal.

[Means for Solving the Problems] For this purpose, in the present invention, a detection pulse signal within a predetermined period during one rotation of the machine machine obtained from a weft thread detector that detects a weft thread reaching a predetermined weft insertion position is detected as a detection pulse signal for the presence or absence of a weft thread. The input signal is input into the determination means, and the time when the count number of this input signal reaches a preset number is determined as the weft arrival timing.

[Function] The weft yarn presence/absence detection means counts the number of detected pulse signals within the predetermined period, measures the generation timing of each detection pulse signal, and determines the generation timing of the pulse signal measured at the predetermined number. It is determined that this is due to the arrival of the weft thread. Signals due to fluff or noise tend to occur relatively regularly every rotation of the machine, and the set number can be grasped by measuring the signal generated due to fluff or noise before the actual weaving stage. Ru. For example, the number of pulse signals generated due to fluff or noise may be lower than the number of pulse signals generated (
If there are N-1), the signal generation timing due to the arrival of the weft is when the Nth pulse signal is detected.

[Example] Hereinafter, an example embodying the present invention will be described based on the drawings.

3 is a weft length measuring and storing device of a winding type, and the weft Y whose length has been stored in the weft measuring and storing device 1 is ejected from the main nozzle 2 for weft insertion, and is inserted through a plurality of auxiliary nozzle groups 3 for weft insertion.
．． 4. 5. 6. 7. 8. The reception continues to the relay injection of 9°IO. If the weft insertion is performed well, the machine rotation angle range [θ1. [theta]2], the weft is detected by the weft detector 11 consisting of a reflective photoelectric sensor, and the loom operation is continued. The weft detector 11 detects a predetermined machine rotation angle range [θ1. θ2], if the presence of weft is not detected, the loom operation is stopped.

The pulling out, unwinding, and stopping of the weft yarn from the yarn winding surface 1a of the weft length measuring and storage device 1 are performed by excitation and demagnetization of the electromagnetic solenoid 12 that drives the locking pin 12a. Electromagnetic solenoid 1
The excitation/demagnetization control of No. 2 is performed by a command from the control computer C, and the control computer C uses the low reencoder I3.
The excitation and demagnetization of the electromagnetic solenoid 12 is controlled via the drive circuit 14 based on the angle detection signal from the solenoid. A weft unwinding detector 15 consisting of a reflective photoelectric sensor is installed near the yarn winding surface 1a.
is disposed, and the weft yarn Y pulled out from the yarn winding surface 1a and unwound is detected by the weft unwinding detector 15. When the number of unwindings detected by the weft unwinding detector 15 reaches a set number, the control computer C instructs the electromagnetic solenoid 12 to be demagnetized, and the locking pin 12a engages with the yarn winding surface 1a to prevent the weft from being pulled out. .

Pressure air injection from the main nozzle 2 for weft insertion is carried out by a solenoid valve v.
Auxiliary weft insertion nozzle groups 3 to I
Pressure air injection at O is performed by solenoid valve V2*V3T
Controlled by opening and closing of V41 v,, Va, Vy+ Va+Vg. Solenoid valve V1 is pressurized air supply tank 16
The solenoid valves v2 to V are connected to the pressure air supply tank 17. An electromagnetic regulator 19.20 for pressure adjustment is interposed between each pressure air supply tank 16.17 and a source pressure tank (not shown).

The opening/closing control of each electromagnetic valve Vl, V2 to V is performed by the command from the control computer C.
are connected to each electromagnetic valve Vl, V2 to ■, via the drive circuit 18 based on the angle detection signal from the rotary encoder 13.
commands to open and close.

Further, the control computer C controls the pressure regulation state of the electromagnetic regulators 19 and 20 via the drive circuit 2I.

The data memory Ct of the control computer C stores the target arrival time Tω at which the tip of the weft yarn Y to be inserted reaches the installation position of the weft yarn detector 11, the tolerance ρ regarding the target arrival time Tω, and both pressure air supply tanks 16 and 17. standard pressure Pt
l P2 , each electromagnetic valve Vl, V! ~V, standard opening/closing timing [αi.

β1) (i=o~9) is input and set by the input setting device 22, and the central processing unit CPU performs weft insertion based on each of these input data and the weft insertion control program input and set in the program memory C2. Execute control. Note that the curve in FIG. 4 represents an ideal flying curve of the weft yarn.

The curves El and EIO in FIGS. 2(a) and 2(b) are curved over a predetermined period [θ1. θ2] represents the weft detection pulse signal taken into the control computer C, and the curve E2 represents the fluff detection pulse signal or noise signal. The tip of the weft Y is vibrating due to the air flow, and the waveform processing of the detection signal of this vibration is the pulse signal E I + E
It is 10. The fact that the pulse signal E2 is not a weft detection signal is determined in advance using the strobe 23 and weft detector 11 shown in FIG. 1 before weaving. The strobe 23 captures the state at the moment when the tip of the weft yarn Y reaches the installation position of the weft yarn detector 11, and detects the arrival timing θr at this time and the weft yarn detector 1.
The generation timing θX of each detection pulse signal E2°El obtained from 1 is compared. θX does not match θr (
Detection pulse signal E of generation timing θX as long as θX<θr)! is a signal other than the weft detection signal, and the detection pulse signal E1° when θX matches θr (θX=θr) represents the arrival timing θr of the weft Y.

In the case of FIG. 2(a), the pulse signal E2 before weft detection
For example, as shown in FIG. 3, there is a case where the fluff 24 passes through the weft detector 11 before the weft Y. In this case, the weft arrival timing is a predetermined period [θ
1. θ, ] is equal to the generation timing of the second pulse signal E1°. In the case of FIG. 2(b), there are two pulse signals E2 before weft detection, and the weft arrival timing is for a predetermined period [θ1. the third pulse signal E, within [θ2]. is equal to the timing of occurrence. Weft detection pulse signals E+, E+. If other pulse signals tend to occur as shown in FIG. Furthermore, if pulse signals other than the weft detection pulse signal E++E+o tend to occur as shown in FIG.
The input is set by 2.

The flowchart in FIG. 5 shows a pressure control program that detects the weft arrival timing and controls the injection pressure of the main weft insertion nozzle 2 and the auxiliary weft insertion nozzles 3 to 10.

When the machine rotation angle reaches 61, the control computer C enters a standby state for receiving signals from the weft detector 11 and counts the number of input pulse signals from the weft detector 11. If this count does not reach the set number M before the machine frame rotation angle θ2 is reached, weft heat is determined and the loom is stopped. If the count reaches the set number M before the machine rotation angle θ, it is determined whether there is a weft thread, and the arrival timing Tω of the Nth set pulse signal is stored. This arrival time Tω is used in place of the earliest detection arrival time to calculate the average value <Tω,> for each n times of weft insertion.

Average value〈Tωpi〉s and target arrival time Tω and difference〈TωN
>, Tω1 = 1 If ΔTωN1 is less than the allowable error ρ, the control computer C maintains the pressure regulation state of the electromagnetic regulator 19.20 as before, and the weft insertion nozzles 2, 3 -
The injection pressure of 10 remains as before. Difference 1ΔTω, 1
If exceeds the allowable error ρ, the control computer C instructs the electromagnetic regulator 19, 20 to change the pressure regulation state, and the weft insertion nozzles 2, 3, . ~10 injection pressure difference 1ΔTωN1
is corrected in the direction of converging to less than the allowable error ρ.

Then, when the machine rotation angle reaches θ2, the control computer C cancels the standby state for receiving the signal from the weft detector 11, and invalidates the pulse signal input from the weft detector 11.

The weft arrival timing is specified in Figure 2 (a).

This is done by understanding in advance the tendency of pulse signal E2 generation other than the weft detection signal due to fluff or noise as shown in (b). Therefore, FIGS. 2(a) and 2(b) represent the generation tendency of the pulse signal E2 that has been grasped in advance.
The pulse signal E, which is generated before the weft arrival timing as shown in FIG.

Furthermore, even when the pulse signal E as shown in FIGS. 2(a) and 2(b) is not generated, the weft arrival timing is the Nth detection pulse signal of the weft detection pulse signals E, ..., E. The timing of occurrence of is understood as the weft arrival timing. The interval between each weft detection pulse signal E1°+EI is short, and the difference from the actual weft arrival timing θr is small. Therefore, this degree of error is more accurate than when the pulse signal generation timing due to fluff or noise is used as the weft arrival timing, and the weft arrival timing measurement method of this embodiment is highly reliable when correcting injection pressure. It will be expensive.

The present invention is, of course, not limited to the above-mentioned embodiments, but can be applied, for example, to trends in the number of weft detection pulse signals and the maximum number of pulse signals other than weft detection signals during a predetermined period [θ1°θ2] during one rotation of the machine. Based on this, an embodiment in which a constant number N is set regardless of machine conditions and weaving conditions is also possible.

Also, the machine rotation angle range [θ1. Weft detector 11 at θ2]
Various hydrochloric acid treatments may be performed after receiving the signal from the machine and at the machine rotation angle θ2.

Furthermore, the present invention can also be applied to jet timing control of weft insertion nozzles.

[Effects of the Invention] As described in detail above, the present invention determines that the weft arrival timing is when the number of detected pulse signals within a predetermined period during one rotation of the machine reaches a preset number. Therefore, the generation timing of a signal other than the weft detection signal is not taken as the weft arrival timing (this is an excellent effect in that highly accurate weft arrival timing measurement can be achieved).

[Brief explanation of the drawing]

The drawings show an embodiment embodying the present invention; FIG. 1 is a front view of a road body, FIG. 4 is a graph showing the weft insertion state, and FIG. 5 is a flowchart showing the pressure adjustment program.Main nozzle for weft insertion 2, auxiliary nozzle groups for weft insertion 3 to 1
0, weft detector 11, control computer C0 as a weft presence/absence determination means Patent applicant: Toyota Industries Corporation Manufacturing agent
Person Patent attorney Hironobu Onda (and 1 other person) Figure (a)

Claims (1)

[Scope of Claims] 1. A weft detector that detects a weft that reaches a predetermined weft insertion position in a jet loom that pulls out a weft from a weft length measurement storage device and inserts the weft from a main weft insertion nozzle; It is comprised of a weft yarn presence/absence determination means that counts the number of input detection pulse signals from the machine and measures the input timing of each detection pulse signal, and measures the number of input detection pulse signals within a predetermined period during one rotation of the machine. A weft insertion control device for a jet loom, wherein the weft presence/absence determining means is provided with an arrival timing determination function of determining the weft arrival timing when the number of wefts reaches a preset number.