JPS5982443A - Wefting apparatus of fluid jet type loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weaving device for a fluid injection type loom, and in particular to a method for precisely controlling the flow rate of the wefting fluid during transient operating conditions so that it is equal to the flow rate of the weaving fluid during steady state operation. Related to sudame equipment.

The injection timing of horizontal injection nozzles is generally controlled by a mechanical cam. The rotation of this cam is driven by the main shaft of the loom in order to synchronize it with the movement of the loom.

By the way, during transient operation of the loom, such as when starting up, the rotational speed of the loom does not reach the steady rotational speed. As a result,
The injection period at startup is longer than the injection period during steady operation, and in extreme cases, weft yarn breakage accidents may occur.
Instability in horizontal placement is unavoidable.

Therefore, the invention disclosed in Japanese Patent Publication No. 57-38699 ``Jet Loom'' is designed to control the flow rate of wefting fluid in relation to the rotational speed of the loom. However, in that invention, the weft thread flying state when the loom starts is different from that when the loom is in steady rotation.
The instability of horizontal insertion remains unresolved.

It is therefore an object of the present invention to stabilize weft insertion by controlling the jetting time, that is, the flow rate of the fluid at the time of start-up as a transient rotational pure production of the loom, so that it is the same as the flow rate during steady rotation. be.

Based on the above object, the present invention detects the start timing of fluid injection from the rotation angle of the loom during transient rotational operation such as when starting the loom, and after a preset delay time from that point, the fluid is By starting the injection of the fluid, the injection time of the fluid, that is, the fluid flow rate, is kept constant under the transient rotational speed.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be specifically described below based on an embodiment shown in the drawings.

First, FIG. 1 shows a wefting device 1 for a fluid jet loom according to the present invention. The weft yarn 2 is transferred from the yarn supplying body 3 to the length measuring device 4
It is fed out to a length necessary for horizontal insertion, stored in a storage device 5, and then guided to a horizontal insertion nozzle 8 via a clamper 6.7. The clamper 6 is operated by a cam 9 that is synchronized with the rotation of the loom. On the other hand, a fluid 10 such as air or water reaches the nozzle 8 via a supply path 15, for example, through a mechanical injection control valve 11 and an electromagnetic type control valve 12 that closes when energized. Injection control valve 11
is operated by the cam 13, which rotates in synchronization with the movement of the loom, and the injection start timing tB
The cam follower 14 is operated and the injection control valve 11 is opened during the period from 1 to 3 until the end timing (3). Therefore fluid 1
If it is possible to pass through the injection control valve 11 and control valve 12, it reaches the nozzle 8 via the supply path 15. In addition, the control valve 12 is controlled by the control valve 12, and the control valve 16 is controlled by the control valve 12.

When the loom is in a transient state, this control device 16 uses the transient rotational speed of the loom as input information, selects a necessary delay time ΔT from the fluid injection start timing ts, and delays the loom corresponding to this delay time ΔT. The control valve 12 is fully opened during the period between the timing and the regular end timing tB, and when the loom is in a steady rotation state, the control valve 12 is fully opened.
is always open, and functions to control the fluid 10 only by the injection control valve 11.

Next, FIG. 2 shows a circuit example of the control device t16.

The main parts of this control device 16 include an encoder 17 that interlocks with the rotation of the cam 13, and a rotation angle θS corresponding to the start timing tB and end timing ty2.

The main components are a θE detector 18, 19, an identification circuit 20, a delayed tuna opening setting circuit 21, 22, a switching circuit 23, and a priority circuit 24. Detector 18 above.
19 are respectively connected to one input terminal of the AND gate 25.26, and these AND gates) 25.2
The output terminal of 6 is connected to the clock input terminal of the counter 20a as the failure identification circuit 20 and the reset input terminal of the flip-flop 2Qa as the priority circuit 24, respectively. The set input of this flip-flop 24a is connected to the detector 18. Also counter 20
The "1" and "2" output terminals of a are connected to delay time setting circuits 21 and 22 such as a monostable multi-by-break, respectively, and an OR gate 27, and then to one input terminal of an exclusive-or-gate 28 of the switching circuit 23. It is connected to. Further, the output terminal of the counter 20H "2" is connected via a NOT circuit 29 to the other input terminals of the anti-games 25 and 26, respectively. The output terminal of the flip-flop circuit is connected to the other input terminal of the exclusive-or gate 28 of the switching circuit 23. On the other hand, the input terminal 30Vi of the stop signal is connected to the clear terminals of the counter 20a and the flip-flop 24a, and one input terminal of the NOR gate 31 of the switching circuit 23. The other input terminal of this NOR gate 31 is connected to the output terminal of the exclude-or gate 28, and the output terminal thereof is connected to the control terminal or base of a switching element, such as a transistor 32.

This transistor 32 is connected to the control valve 12 and the clamper 7.
It is connected in series with the excitation coils 33 and 34 between the power supply terminal 35 and the ground 36.

Next, referring to FIG. 3, the operation of the above-mentioned wefting device will be explained. FIG. 3 shows the rotational speed N1 of the loom, the opening/closing states of the injection control valve 11 and the control valve 12, the stop signal A, the angle signals θS, θ
E1 delay time signal M1 r Mt, output signal Q, B
1 + B2 and the injection status of fluid 10 are shown respectively. As already mentioned, the rotational speed N of the loom is determined at the start-up time t. After a transition time τ has passed, the steady rotational speed N is reached. K
reach Figure 3 shows that the width is 2 during this transition time τ.
It is depicted with sadness that it will happen again and again. When the rotational speed N is low, the rotational speed of the cam 13 is also low, so the injection control valve 11 maintains an injection period TI, T2 which is inversely proportional to the transient low rotational speed N and is longer than the steady-state injection period T. It becomes a released state. In other words, the injection period T in the steady state is constant from the injection start timing tB to the injection end timing tBO, but the injection period TI, 'rz at the transient time τ is a function of the transient rotation speed N and is constant. , is indeterminate.

This injection period T1. Tx is expressed as follows using delay time ΔT1+ΔT2.

'r, = T + ΔTI T2 = T + ΔT2 Now, when the loom is stopped, the stop signal A at the high level appears at the input terminal 309, which causes the counter 2 to
0a and the flip flop 24a have been returned to their initial states. The loom starts up at I! . When the engine is started, the stop signal A changes from the "H" level to the "L" level. At this time, since the Nant gate 29 receives the input signals at the high level, it outputs an output signal B2 at the 'H' level, turns on the transistor 32, and turns on the excitation coils 33 and 34 of the clamper 7 and the control valve 12. Make it in an excited state.

As a result, the clamper 7 and the control valve 2 are closed. When the signal of the rotation angle θ of the encoder 17 becomes the rotation angle θS, the detector 18 sends the angle signal θS of the 1H level corresponding to the start timing tS to the flip-flop 2.
4a to the set input terminal, and its output signal Q is -H”
level and simultaneously sends it to one input terminal of the AND gate 25. Since the AND gate 25 receives a 1H level signal on the other side, the AND gate 25 sends the 1H level angle signal θS to the clock input terminal of the counter 20a. Here, the counter 20a counts "1" corresponding to the first input, and uses its output to operate the delay time setting circuit 21 to generate the delay time signal M1 at the "H" level, and output the OR gate. 27 to the exclusive use save or gate 28 of the switching circuit 23. The pulse width of this delay time signal M1 corresponds to the delay time ΔT1. When receiving a ゝゝH〃 level signal,
Since it is generating the output signal B1 at L// level, the NOR gate 31 continues to generate the signal at H level. Therefore, the control valve 12 remains closed. However, after the delay time ΔTl has elapsed, the delay time signal Ml changes from 75E'H' level to 11L' level.
The output signal B1 is from tl L, /l level to NH〃
level, and the output signal B2 of the NOR gate 31 changes from the 11H level to the ``L'' level, so the switching transistor 32 becomes cut off.
Therefore, the control valve 12 changes to the open state at that point. Subsequently, when the first end timing tB comes, the detector 19 generates the angle signal θE of the ゝゝH〃 level and sends it from the AND gate 26 to the reset input terminal of the flip write flop 24a, so that its output signal Q is as follows. Therefore, the output signal Bl of the exclusive use save or gate 28 changes from the 1H" level to the 1L" level, and the output signal B of the NOR gate 31 changes from the 1H" level to the 1L" level.
2 changes from the "L" level to the "H" level. Therefore, the switching transistor 32 is not in a conductive state, and the control valve 12 is closed at that point. As already mentioned, the injection control valve 11 is already in the open state at the time of the start timing tB, but since the control valve 12 is in the open state for the first time after the delay time ΔT1, the injection of the fluid 10 is as follows. As in the steady rotation state, this is performed only during the regular injection period T.

The angle signal θ corresponds to the subsequent second start timing tB.
When S is input, flip-flop 24a is set again and counter 20a "counts 2J;
The second delay time setting circuit 22 is activated. Therefore, the delay time setting circuit 22 generates a delay time signal M2 of "H" level with a pulse width corresponding to the delay time ΔT2, and sends it from the OR gate 27 to the exclude-or gate 28.Same as the first time. Since the control valve 12 is opened after the delay time ΔT2, the injection of the fluid 19 starts substantially at the time of the delay time and continues over the regular injection period T.

If two injections are performed during this transient time τ, the loom will:
Since it enters a steady rotation state, subsequent control becomes unnecessary. Therefore, the output of "2" from the counter 20a is inputted as a 1TI' level signal to the AND gates 25 and 26 via the NOT circuit 29, and the subsequent input of the angle signals θS and θE is prohibited. Therefore flip-flop 24H
After that, the output signal Q of ``N''H'' level is -1, so the output signal B1 of the exclude-or gate 28 is ``H'' level, and the output signal B2u of the NOR gate 31, It becomes 'L' level. This causes transistor 32 to be cut off and therefore control valve 12 to remain open thereafter. In this way, in the steady state of operation, the injection of the fluid 10 is controlled only by the opening and closing of the injection control valve 11.

Note that in the above embodiment, the maximum count value of the counter 24a is set to "2", assuming that there will be two insertion operations during the transient time τ from startup to steady operation. Two delay time setting circuits 21 and 22 are provided correspondingly, but one or three or more of these may be provided as necessary, corresponding to the number of times of horizontal insertion in a transient state. Furthermore, since the logic circuit of the control device 16 is fp'J, the intended purpose can be achieved by combinations other than this logic.

In the present invention, even when the loom is in a transient rotation state lower than the steady rotation speed, the fluid injection period, that is, the fluid flow rate, is controlled to be the same as the steady flow rate, so weft breakage and unstable wefting can be prevented. In addition, the flying time of the weft thread is constant υ regardless of the rotation speed of the loom, and the time when the weft thread reaches the opposite nozzle side is also stabilized, making it possible to weave high-quality fabrics. Since the control device and the control device do not substantially function during steady operation, these do not cause weaving to become unstable during steady operation.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a wefting device for a fluid jet loom according to the present invention, FIG. 2 is a block diagram of a control device, and FIG. 3 is a time chart during operation. 1... Wefting device for fluid jet loom, 2...
Weft, 6, 7... Clamper, 8... Nozzle, 10... Fluid, 11... Injection control valve, 1
2... Control valve, 15... Supply path, 16... Control device, 17... Encoder, 18.19... Detection circuit, 2o... Identification circuit, 20a... Counter, 21 .22...Delay time setting circuit, 23...
Switching circuit, 24...Priority circuit, 24a...
·flip flop. 264

Claims (2)

[Claims] (1) A weft inserting nozzle that injects fluid to make the weft yarn fly; an injection control valve that is located in the fluid supply path and controls the fluid injection in synchronization with the rotation of the loom; A control valve that is interposed in the supply path and controls the fluid flow rate detects the start timing of fluid injection during the transient operating state of the loom, and opens the control valve after a preset delay time from the start timing. 1. A weaving device for a fluid jet loom, characterized by comprising a control device for controlling the state. (2) A start timing detector, an identification circuit that determines the number of yototo inserts when the loom's rotational speed is in a transient state, and a predetermined delay time according to the judgment content of this identification circuit. Priority is given to a delay time setting circuit that generates a signal, a switching circuit that opens the control valve after the delay time, and a signal that sends a signal to the switching circuit that holds the control valve open after the transient operation period has elapsed. The weft inserting device for a fluid jet loom according to claim 1, characterized in that the weft inserting device for a fluid jet loom comprises a control device together with a circuit.