JPH0141736B2 - - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a wefting device for a fluid-jet loom, in particular for determining the injection of wefting fluid, water or air, especially air, during transient operating conditions. This invention relates to a device for controlling the injection so that the injection is always approximately equal to that of the regular injection.

BACKGROUND OF THE INVENTION The main movements of a loom are all set in relation to the rotation angle of the loom. The injection timing of the main nozzle and the auxiliary nozzle for wefting is generally controlled by a mechanical cam. The rotation of this cam is driven by the rotation of the main shaft of the loom in order to synchronize it with the movement of the loom.

By the way, in a transient operating state of the loom, for example, at startup, the rotational speed of the loom has not reached the steady rotational speed. As a result, the injection period of the weft fluid at startup is longer than the injection period during steady operation, although it starts from the rotation angle of the normal injection start. This is because the time required for one rotation is long, and the elapsed time between certain rotation angles is temporally extended. As a result, more fluid is ejected than necessary, and in extreme cases, the weft thread may break off, or the tip of the weft thread may become bent due to the timing difference between the main nozzle and the auxiliary nozzle, resulting in poor weft insertion. Stability is inevitable.

Prior Art For example, the invention of Japanese Patent Publication No. 57-38699 ``Jet Loom'' was designed to control the fluid flow rate for weft insertion in relation to the rotation speed of the loom, and to make the fluid flow rate relatively small during low speed rotation. It is set to . However, in that invention, the weft thread flying state when the loom is started is different from that during steady rotation, so the instability of weft insertion still remains unsolved.

OBJECT AND SOLUTION PRINCIPLE OF THE INVENTION Therefore, an object of the present invention is to make the transient rotational state of the loom, mainly the fluid injection time and fluid flow rate at the time of starting the loom, almost the same as the state during steady rotation. The objective is to control the width and stabilize the horizontal insertion.

Based on the above object, the present invention considers transient rotational characteristics such as when starting a loom, and closes the main nozzle and auxiliary nozzle for a regulated time, so that even during a transient operation period, the present invention always operates during steady operation. Weft insertion is performed using a fluid flow rate similar to that of the above.

On the other hand, the inserted weft yarn is detected by a weft yarn filler at the end of the fabric on the side opposite to the nozzle. The loom control device receives the output signal from the weft filler and sequentially controls the loom while checking the weft insertion state. For this reason, the time when the weft reaches the opposite nozzle side is an important timing for controlling the loom.

If injection is performed for a specified time from the same rotation angle as during steady rotation when the loom is in a transient rotation state, the injection flow rate can be equal to the flow rate during steady rotation, but if The time point at which the vehicle reaches the end is faster than during steady operation. As a result, normal control of the loom cannot be expected.

Therefore, another object of the present invention is to control the loom so that the arrival timing of the inserted weft yarn is the same as the arrival timing during normal rotation even when the loom is in a transient rotational state.

Based on the above object, the present invention starts fluid injection after a predetermined delay time from the point of rotation angle at which wefting starts when the loom is in a transient rotational state. Therefore, in the present invention, even in a transient operating state, the rotation angle at the end of fluid injection always matches the rotation angle at the end of the lateral insertion, as in the steady state. Therefore, the loom can be controlled under similar conditions both during transient operation and steady operation.

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

Embodiment 1 (FIGS. 1 to 4) First, FIG. 1 shows a weft insertion device 1 of the present invention. The weft yarn 2 is wound around a yarn feeder 3, passes through the inside of a winding arm 4, is locked by a locking means, that is, a locking pin 6, and is attached to a drum 5 for length measurement storage.
The thread is wound around the outer peripheral surface of the thread by one pick or several picks continuously, and is guided through a thread guide 7 to a main nozzle 8 for weft insertion. The winding arm 4 synchronizes with the rotation of the loom and receives the rotational force to rotate along the outer periphery of the stationary drum 5. The drum 5 also has a winding arm 4
Although it is rotatable on the same axis as the center of rotation of the weft thread 2, it remains stationary when the weft thread 2 is wound around it. Further, the locking pin 6 is in a state where it can move back and forth and locks the weft thread 2 when it enters the circumferential surface of the drum 5, and prevents the weft thread 2 from starting winding or unwinding on the circumferential surface of the drum 5. giving a stop. When the locking pin 6 moves backward, the weft thread 2, which has been wound around the peripheral surface of the drum 5 and is in a stored state, becomes unwound and is set in a state where it can be wefted by the main nozzle 8. Ru.

The main nozzle 8 takes in a fluid for weft insertion, such as pressurized air 9, and injects it toward the weft thread 20 during weft insertion, and by placing the unwound weft thread 2 on this jet flow, Road 20
Let it fly inside. This pressurized air 9 is supplied to a supply path 10
It is controlled by a mechanical injection control valve 11 and an electromagnetic control valve 12. The injection control valve 11 is operated by a cam 13 on a rotating shaft 15. This cam 13 rotates in synchronization with the movement of the loom, operates the cam follower 14 between the rotation angle θS at the start of injection and the rotation angle θE at the end of injection, and opens the injection control valve 11. Therefore, the pressurized air 9 reaches the main nozzle 8 via the supply path 10 when it can pass through both the injection control valve 11 and the control valve 12 at the same time.

Further, the control valve 12 is of a type that opens when energized and returns automatically when not energized, and is controlled by a control device 16. This control device 16
calculates the necessary delay time Δt from the rotation angle θS at the start of injection, using the transient rise characteristics of the loom's rotation speed as input information when the loom is in a transient state, and calculates the start timing tS after this delay time Δt. The control valve 12 is kept in an open state for a period from to end timing tE, and during a transient operating state, the control valve 12 is opened.
2 controls the supply time of the pressurized air 9. When the loom reaches a steady rotational speed, the control device 16 keeps the control valve 12 open at all times, so that the control valve 12 is connected to the supply path 1.
The 0 portion indicates a state in which there is no substantial effect. Therefore, in a steady state, only the injection control valve 11 controls the pressurized air 9. In the steady operating state, the rotation angle θS at the start of injection and the rotation angle θE at the end always coincide with the injection start timing ts and end timing tE.
However, in a transient operating state, the injection start rotation angle θS is stretched on the time axis, so it does not match the regular injection start timing tS, and it only matches after a delay time Δt. becomes. However, even in this transient state, the rotation angle θE at the end of injection always coincides temporally with the end timing tE.

The flying weft thread 2 is also accelerated and urged in the weft insertion direction by a plurality of auxiliary nozzles 17 provided near the threadway 20. These auxiliary nozzles 17 are divided into, for example, three groups of three, and the auxiliary nozzles 17 in each group are as follows:
Pressurized air 19 having a pressure slightly lower than the pressure air 9 is taken in through each supply path 18, and when the flying weft yarn 2 passes through the position of each auxiliary nozzle 17, the pressurized air 19 is auxiliary. inject and accelerate the injected air. Similarly to the above, these supply paths 18 are provided with a mechanical injection control valve 21 and an electromagnetic type control valve 22 of a self-resetting type that opens when energized and is connected in series. The injection control valve 21 is controlled by a cam 23 and a cam follower 24. The mounting phases of these cams 23 with respect to the rotating shaft 15 are slightly shifted in correspondence with the arrangement positions of the auxiliary nozzles 17 of each group. Further, the control valves 22 are driven by respective control devices 25.

Next, FIG. 2 shows a specific configuration of the control device 16. This control device 16 includes proximity switches 27, 28, 29, a one-shot multivibrator 30, and an R-S type flip-flop 3.
1, 32, 33 and and gates 34, 35,
36, 37, an OR gate 38, and a solenoid drive circuit 39.

The proximity switches 27, 28, and 29 are timing signal generating means, and correspond to the dog 40 of the rotating body 26 attached to the rotating shaft 15, with different phases. The proximity switch 27 is connected to the set input terminal of the flip-flop 31 as a memory circuit, and the proximity switch 28,
29 are connected to one input terminal of AND gates 34 and 35, respectively. The input terminal of the one-shot multivibrator 30 is connected to the input terminal 41 of the operation signal A, and the output terminal thereof is connected to the flip-flop 3 as a memory circuit.
They are connected to reset terminals 1, 32, and 33, respectively. The output terminal of the flip-flop 31 is connected to the other input terminal of AND gates 34 and 35, and to one input terminal of AND gates 36 and 37, respectively. 32, 33
is connected to the set input terminal of the The output ends of the flip-flops 32 and 33 are connected to the other input ends of AND gates 36 and 37, respectively. The output ends of the AND gates 36 and 37 are connected to the input ends of an OR gate 38, and the output end of the OR gate 38 is connected to a solenoid drive circuit 39. This solenoid drive circuit 39 is connected to the drive section of the control valve 12.

The control device 16 controls the control valve 12 by:
Although the configuration is as described above, the configuration of the other control device 25 is exactly the same as the configuration of the control device 16 described above.

Next, referring to FIG. 3, the above-mentioned wefting device 1
Explain the operation. The control system of the loom at the start of operation
When “H” level operation signal A is input at t0,
The number of rotations N per unit time of the loom increases sequentially from zero, and reaches the steady number of rotations N0 after a transient time τ. In Fig. 3, it is assumed that the horizontal axis is the rotation angle θ, assuming that the weft is performed twice during this transition time τ.
Or, it is drawn taking time t.

When the rotational speed N is low, that is, in the period of the transient time τ, the rotational speeds of the rotating shaft 15 and the cam 13 are also low, so the injection control valve 11 is inversely proportional to the transient low rotational speed N during the steady state. The open state occurs during transient injection periods T1 and T2 that are longer than the prescribed injection period T. That is, during steady operation, the injection start angle θS always coincides with the start timing tS, so the injection period T is always constant at a specified time. However, since the injection start angle θS at the transient time τ does not match the start timing tS,
The injection periods T1 and T2 are transient functions of the rotational speed N and are indefinite. Therefore, this injection period T1,
T2 is expressed as follows using delay times ΔT1 and ΔT2.

T1=T+ΔT2 T2=T+ΔT2 By the way, the starting rotation angle θo when the loom starts operating
is set in advance, and the transient time τ
Since the rise characteristic of the rotational speed N of the loom is considered to be approximately constant, the rotation angle at the end of the delay times ΔT1 and ΔT2 is also approximately constant. Therefore, the proximity switches 27 and 29 set the delay time ΔT1,
Generate “H” level timing signals S1 and S3 at rotation angles θ1 and θ3 corresponding to the end point of ΔT2,
Further, the proximity switch 28 generates an "H" level timing signal S2 at a rotation angle θ2 between the timing signals S1 and S3.

On the other hand, since the operation signal A at the "H" level is input at the start time t0, the one-shot multi-vibrator 30 generates an output signal at the "H" level, and all the flip-flops 31, 32, 33
to the reset state in advance. Therefore, since the outputs of the AND gates 36 and 37 are both set to "L" level, the solenoid drive circuit 39
In this case, the control valve 12 is set in a closed state.

By the way, at the time of rotation angle θ1 after a delay time ΔT1 from rotation angle θS at the apparent start of injection, the timing signal S1 of “H” level is output from flip-flop 3.
1, the flip-flop 31 generates an "H" level output signal Q1 at its output terminal, so the AND gate 36 receives "H" level signals at both input terminals. from,
It generates an output signal of "H" level and operates the solenoid drive circuit 39. That is, the solenoid drive circuit 39 drives the control valve 12 to open the control valve 12 at the rotation angle θ. In this way, the control valve 12 enters the open state at a time delayed by the delay time ΔT1 from the rotation angle θS at which the apparent injection starts.
As a result, the pressurized air 9 is injected by the main nozzle 8 over the period when both the injection control valve 11 and the control valve 12 are open, that is, the prescribed injection period T. As a result, the unwound weft thread 2 is wefted toward the channel 20 along with the jet of pressurized air 9. Therefore, even during this transient time τ, the injection period T is set to be approximately the same as the injection period T during the steady state.

While the weft yarn is flying along the path 20, the auxiliary nozzle 17 sequentially injects pressurized air 19 in a relay manner to supplementally accelerate the flight of the weft yarn 2. A constant delay time ΔT1 is also set for this auxiliary nozzle 17 in the same manner as described above. Furthermore, when operating a plurality of groups of auxiliary nozzles 17 in sequence, if the injection periods overlap in time when switching from the previous group to the next group, the flow of the auxiliary pressurized air 19 can be It will continue smoothly without any interruption. In this way, the pressurized air 19 is injected into the channel 20 by the auxiliary nozzle 17 at the most appropriate time for accelerating the weft thread 2. These auxiliary nozzles 17 are
Since the ink is injected sequentially from the group on the main nozzle 8 side in a relay manner, the mounting angles of the three cams 23 with respect to the rotating shaft 15 are sequentially set at different phases, as described above.

Now, after the first weft insertion is completed, the proximity switch 28 generates the "H" level timing signal S2 and sends it to one input terminal of the AND gate 34, so the AND gate 34 outputs the "H" level timing signal S2. The flip-flop 32 is set in the set state by the output signal, and the output signal 2 at the "L" level is sent to one input terminal of the AND gate 36. At this point, the output of the AND gate 36 changes from the "H" level to the "L" level, so the solenoid drive circuit 39 sets the control valve 12 to the closed state.
Note that if the timing signal S2 is generated earlier than the rotation angle θE at the end of injection, control at the end of injection is also possible.

When the rotation angle θS for the second injection start comes, the injection control valve 11 immediately becomes open, but as in the first case, the control valve 12 starts to open after the delay time ΔT2. Therefore, the pressurized air 9 is injected over the prescribed injection period T. In other words, after the delay time ΔT2, the timing signal of the proximity switch 29 becomes "H" level.
When S3 is generated, the AND gate 35 sets the flip-flop 33 with an output signal of the "H" level, and changes the output signal Q3 to the "H" level. Upon receiving a high level input signal, an "H" level output signal is sent to a solenoid drive circuit 39 via an OR gate 38. Therefore, the solenoid drive circuit 39 opens the control valve 12 after the delay time ΔT2. In this way, the injection control valve 1
1 and control valve 12 are both in the open state, pressurized air 9 is injected from the main nozzle 8 for filling. The above relationship also applies to the auxiliary nozzle 17.

After two weftings have been carried out for the transient time τ, the rotational speed N of the loom has already reached the steady rotational speed N0, so such special control is no longer required. Therefore, the control devices 16 and 25
After the transition time τ has elapsed, the control valve 12 is kept open. Therefore, when entering this steady operating state, only the injection control valve 11 substantially controls the pressurized air 9. That is, when the wefting is performed twice, all the flip-flops 31, 32, and 33 output an "H" level output terminal signal.
Since Q1, 2, and Q3 are generated, the "H" level input signal is continuously input to the solenoid drive circuit 39, and the solenoid drive circuit 39 continuously sets the control valve 12 to the open state. There is. In addition,
The response speed of the solenoid drive circuit 39 is increased by temporarily applying a voltage higher than the voltage required to drive the control valve 12.

Now, the driving mechanism of the locking pin 6 will be explained here. As shown in FIG. 4, the locking pin 6 is attached to the tip of a swing lever 67, which is supported by a support shaft 68 and supported by a spring 69.
While being biased counterclockwise by the roller 70 at the other end, the roller 70 contacts the drive cam 71. In principle, this drive cam 71 rotates once per revolution of the loom.
During the weft insertion period, the locking pin 6 is pulled up from the circumferential surface of the drum 5, and the weft thread 2 is unwound. Even if this unwinding is performed over the transient time τ in the same manner as during steady rotation, the fluid injection from the main nozzle 8 is performed after the delay times ΔT1 and ΔT2, so the weft insertion is still substantially performed during the delay time ΔT1. , is performed after ΔT2. However, if during this time the stored weft yarn 2 becomes unstable and is inconvenient, an electromagnetic plunger 72 is provided. This electromagnetic plunger 72 has delay times ΔT1 and ΔT2 during the transient time τ.
The plunger rod 73 is moved over the swing lever 6.
7 and pulls up the locking pin 6 only after the delay times ΔT1 and ΔT2 have elapsed, and the unwinding point is delayed until the regular start timing tS. Therefore, the output of the control device 16 is used as is when driving the electromagnetic plunger 72. Of course, when it enters a steady operating state, the electromagnetic plunger 72 is moved by the magnetic attraction force to the plunger rod 7.
3 is always moved backward and does not take part in the movement of the locking pin 6.

Embodiment 2 (FIGS. 5 and 6) Next, FIG. 5 shows another embodiment of the control devices 16, 25. The control device 16 in the embodiment shown in FIG. 2 controls the control valve 12 to be in the open state for two horizontal strokes for the transient time τ.
The embodiment shown in FIG. 5 is an example in which the control valve 12 is controlled only for one weft insertion.

The timing signal S1 in this embodiment is
The timing signal is generated by an encoder 42 connected to the rotating shaft 15, a comparator 44 that compares the output signal of the encoder 42 with the input signal from the setting device 43, and one input of the AND gate 47. sent to the edge. Further, the operation signal A from the input terminal 41 serves as an input signal to the one-shot multivibrator 46 as well as the other input terminal of the AND gate 47 . The AND gate 47 and the one-shot multivibrator 46 are respectively connected to the set input terminal and the reset input terminal of a flip-flop 45 as a memory circuit, and the output terminal of the flip-flop 45 is directly connected to the solenoid drive circuit 39. ing.

Since the setting device 43 outputs a signal of the rotation angle θ1 corresponding to the delay time ΔT1 to the comparator 44, when the loom reaches the rotation angle θ1 after starting, the comparator 4
4 is the output signal of the setting device 43 and the encoder 4
Check that it matches the loom rotation angle signal from 2,
At the time of coincidence, the timing signal S1 of "H" level is sent to the AND gate 47 as shown in FIG. Therefore, the AND gate 47
4, the flip-flop 45 is set and the solenoid drive circuit 39 is activated. Of course, this flip-flop 45 is reset in advance by the one-shot multivibrator 46 as in the previous embodiment at the time when the "H" level operation signal A is input. When the first weft insertion is completed in this way, the control valve 12
are always open and do not substantially participate in the control of the pressurized air 9, 19.

Note that since the control valve 12 must be set to an open state when the power is turned on, an additional circuit is provided. Of course, the delay time ΔT1
The rotation angle θ1 is set to an appropriate value according to the number of rotations of the loom, the weft pattern, etc. Note that the signal for resetting the flip-flop 45 may be an "H" level operation preparation signal. Further, the output signal of the comparator 44, that is, the timing signal S1, may be input directly to the set input terminal of the flip-flop 45 without passing through the AND gate 47. Control device 16, 2 of this embodiment
5 is effective when the rotational speed of the loom starts up quickly and is extremely simplified, so it can be implemented easily at low cost.

Embodiment 3 (FIGS. 7 to 9) Next, in the embodiment shown in FIG. 7, the weft yarn 2 after length measurement is stored by an air flow, and the pressurized air 9 is stored by one electromagnetic control valve 12. An example of controlling only That is, the weft thread 2 is measured by the length of one pick required for weft insertion by the rotation of a pair of length measuring rollers 48, and the length of the weft thread 2 is measured by the length of one pick required for weft insertion.
It is stored in a loop between Between the pair of buffs 49, a storage nozzle 50 is provided on the inlet side, and the stored weft yarn 2 is held in a U-shaped slack state by air. and main nozzle 8
Although the weft thread 2 is drawn in under weak tension, the unwinding of the weft thread 2 in this stored state is performed by the clamper 51 as a locking means. That is, this clamper 51 is equipped with an electromagnetic solenoid 52.
At the time of weft insertion, the grip on the weft thread 2 is released, and the stored weft thread 2 is set in a state where it can be inserted by the main nozzle 8. Moreover, only one control valve 12 is interposed in the supply path 10, and no injection control valve 11 is provided. Therefore, unlike the first and second embodiments, the control valve 12 has a transient time τ
In addition to this period, the pressure air 9 is continuously controlled during the steady operation state. The injection control valve 21 is also omitted in the supply path 18 of the auxiliary nozzle 17.

FIG. 8 shows a circuit of the control device 16 for controlling the control valve 12 and the clamper 51. This control device 16 includes a one-shot multivibrator 53 and an R-
S-type flip-flops 54, 55, 56, 5
7. In addition to the AND gates 58, 59, 60, and 61 and the OR gate 62, the solenoid drive circuit 39 is provided.

The one-shot multivibrator 53 has its input end connected to the input terminal 41 of the operation signal A, and its output end connected to the flip-flop 5.
4, 55, and 56, respectively. Further, the set input terminal of the flip-flop 54 and one input terminal of the AND gate 59 are connected to proximity switches 63 and 64, respectively. , timing signals S1 and S2 are generated at predetermined rotation angles θ1 and θ2. A set input terminal and a reset input terminal of the flip-flop 57 are respectively connected to an encoder 66 for detecting the rotation of the rotary shaft 15. This encoder 66 determines the rotation angle of the rotary shaft 15, detects the rotation angle θS at the start of injection and the rotation angle θE at the end, and at each time, an on-timing signal of "H" level is output.
SN and off-timing signals SF are generated sequentially. Note that the rotation angle θS and the rotation angle θE can be adjusted inside the encoder 66. The output terminal of this flip-flop 57 is connected to one input terminal of AND gates 60 and 61, respectively. The output of the flip-flop 54 is connected to one input of AND gates 58, 60, and the AND gate 58 is connected to the encoder 66 on the input side and to the set input of the flip-flop 55 on the output side. It is connected to the. One output terminal of this flip-flop 55 is connected to an input terminal of an AND gate 60.
Further, the other output terminal is connected to the other input terminal of the AND gate 59. The output terminal of AND gate 59 is connected to the set input terminal of flip-flop 56, and the output terminal of flip-flop 56 is connected to the other input terminal of AND gate 61. The AND gates 60 and 61 are both connected to the input terminal of an OR gate 62, and the output terminal of the OR gate 62 is connected to the solenoid drive circuit 3.
9 is connected.

All of the auxiliary nozzles 17 are controlled by one control device 25.
The configuration is the same as that of the control device 16 described above. All of these auxiliary nozzles 17 operate simultaneously after the weft yarn has flown, accelerating the weft yarn 2 during its journey.

Next, the operation of the control device 16 will be explained with reference to FIG. When the operation signal A at the "H" level is input at the start of operation time t0, the one-shot multivibrator 53 generates an output signal at the "H" level, and the flip-flops 54, 55, 56,
to reset state. Therefore, the output signals Q1 of these flip-flops 54, 55, 56,
Q2 and Q3 all change to "L" level at that point. Thereafter, when the rotation angle θS for the apparent injection start is reached, the encoder 66 generates the on-timing signal SN of the "H" level, thereby setting the flip-flop 57 to the set state and changing the output signal Qo to the "H" level. ”Set the level state. Also, when the rotation angle θE at the end of injection comes, the encoder 6
6 is for generating the off-timing signal SF,
The output terminal signal Qo of the flip-flop 57 is “H”
level changes to “L” level. In this way, the output signal Qo of flip-flop 57 is
It is set to the "H" level for the section from the rotation angle θS at the start of injection to the rotation angle θE at the end. Here, the injection start rotation angle θS for the transient time τ does not match the regular injection start timing tS, and only matches after the delay time ΔT1 or the delay time ΔT2.

Then, after the delay time ΔT1, the proximity switch 63
Since the flip-flop 54 generates the timing signal S1, the flip-flop 54 enters the set state and outputs the "H" level output signal Q1 to one input terminal of the AND gates 58 and 60. At this point, the AND gate 60 receives "H" level signals at all inputs, so it sends the "H" level output signal X1 to the solenoid drive circuit 39 via the OR gate 62. In this way, the solenoid drive circuit 39
After the delay time ΔT1, the control valve 12 and the clamper 51 are brought into an open state, and the open state is continued until the subsequent generation of the "H" level off-timing signal SF. Therefore, the control valve 12 injects the pressurized air 9 over a specified injection period T,
The open weft thread 2 will be inserted.

In the second horizontal insertion that follows in the same way, the output signal Qo of the flip-flop 57 is at the "H" level,
This is done by the timing signal S2 and during the period when the output signal Q3 of the flip-flop 56 is set at the "H" level.

When wefting is performed twice in this way,
The transition time τ at the time of starting the loom has elapsed, and therefore the rotational speed N of the loom has reached the steady rotational speed N0.
When this steady operation state is entered, the flip-flop 5
The output signals Q1, Q2, and Q3 of 4, 55, and 56 have all changed to "H" level. Therefore, when the steady state of operation is entered, the on-timing signal SN and the off-timing signal SF substantially drive the solenoid drive circuit 39. When the steady state is entered in this way, the solenoid drive circuit 39
is the period from the generation point of the on-timing signal SN, that is, the rotation angle θS at the start of injection (start timing tS), to the rotation angle θE at the end of injection, that is, the off-timing signal SF (end timing tE),
With the control valve 12 in an open state, pressurized air 9 is injected for weaving.

Such a control state also applies to the auxiliary nozzle 17. In addition, the off timing signal SF
By shifting the point in time at which . In addition, the above embodiment is
The control device 16 simultaneously controls the control valve 12 and the clamper 51; however, the control device 16 controls only the control valve 12 or the clamper 51.
It is also used to control only the In a transient state, even if the control valve 12 opens early without the delay time ΔT, the clamper 51 opens the stored weft thread 2 only after the delay time ΔT, so the weft insertion is substantially This is done after a delay time ΔT. Such control is effective for a strong weft yarn 2 that does not break. Conversely, even when only the control valve 12 is controlled to open after the delay time ΔT, the unwinding of the weft thread 2 is performed quickly, but since the fluid injection is started after the delay time ΔT, weft insertion is still not possible. , is executed substantially after a delay time ΔT.

Effect of the invention The present invention provides the following unique effects.

Even when the loom is in a transient rotation state lower than the steady rotational speed, the fluid injection period, that is, the fluid flow rate, is controlled to be approximately the same as the steady flow rate, so weft breakage and unstable weft insertion are eliminated. In addition, since the end timing of injection during transient operating conditions is always constant, the timing at which the weft yarn reaches the opposite nozzle side is always stable, and therefore even when the loom control is in a transient state, it is the same as during steady operation. The same is done. Furthermore, since the auxiliary nozzle also injects auxiliary pressurized air after a certain delay time, the auxiliary jet from the auxiliary nozzle effectively accelerates the weft yarn during flight, thus eliminating waste. No more spraying,
Furthermore, since the auxiliary injection is not shifted on the time axis, it is possible to prevent air turbulence in advance.

[Brief explanation of drawings]

Fig. 1 is a diagram of the wefting device of the present invention, Fig. 2 is a block diagram of the control device, Fig. 3 is a time chart during operation, Fig. 4 is a front view of the locking pin drive mechanism, FIG. 5 is a block diagram of another embodiment of the control device, FIG. 6 is a time chart of the control device of FIG. 5, and FIG. 7 is a wefting device of still another embodiment of the present invention. FIG. 8 is a block diagram of the control device in the embodiment of FIG. 7, and FIG. 9 is a time chart during operation of the control device of FIG. DESCRIPTION OF SYMBOLS 1... Weft insertion device, 2... Weft thread, 6... Locking pin as a locking means, 8... Main nozzle for weft insertion, 9... Pressure air, 10... Supply path, 11
... Injection control valve, 12 ... Control valve, 13 ... Cam, 15 ... Rotating shaft, 16 ... Control device, 17 ...
... Auxiliary nozzle, 18 ... Supply path, 19 ... Pressure air, 20 ... Hitachi, 21 ... Injection control valve, 22 ...
...Control valve, 23...Cam, 25...Control device, 5
1...A clamper as a locking means.

Claims (1)

[Scope of Claims] 1. A length measuring and storage device for measuring and storing a weft yarn of a predetermined length, a locking means for locking the stored weft yarn, and a fluid jetting device for locking the weft yarn in an unwound state. A wefting nozzle that is made to fly all over the road by a weaving machine, a control valve located in the fluid supply path of this nozzle that controls the timing of fluid supply, and a control valve that controls the timing of the fluid supply when the loom is in a transient state of rotation. A predetermined delay time is determined as a function of the number of rotations, and the control valve is opened for a predetermined injection time after the delay time from the time of the apparent wefting start rotation angle, and when the loom is in a steady rotation state. A wefting device for a fluid injection type loom, comprising: a control device that keeps the control valve in an open state for a prescribed injection time from a wefting start rotation angle. 2. Timing signal generating means for generating a timing signal corresponding to a preset delay time from the transient rotational state of the loom, a memory circuit for storing the generation point of the timing signal, and a means for receiving the output of the memory circuit. The fluid injection type loom according to claim 1, characterized in that the control device is constituted by a solenoid drive circuit that opens the control valve during a period from the time when the timing signal is generated to the rotation angle at which the injection ends. horizontal insertion device. 3. The wefting device for a fluid jet loom according to claim 1 or 2, wherein the locking means is constituted by a locking pin. 4. The wefting device for a fluid jet loom according to claim 1 or 2, wherein the locking means is constituted by a clamper.