JPH0819599B2 - Weft inserting device for fluid jet loom - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft inserting device for a fluid jet loom, and more particularly to a weft inserting device adapted to automatically adjust to optimum weft inserting conditions.

[0002]

2. Description of the Related Art Conventionally, a weft inserting device of this type is disclosed in, for example, JP-A-59-71459.
This is because the photoelectric feeler detects the timing when the tip of the weft thread inserted by the fluid from the weft insertion nozzle reaches the non-nozzle side. If the timing is fast (when the transfer speed is fast), The supply pressure of the fluid to the nozzle is decreased, and if the supply speed is slow, the supply pressure is increased to suitably adjust the weft insertion conditions.

[0003]

However, in such a conventional device, the arrival timing of the tip of the weft yarn to the side opposite to the nozzle is simply detected, and the detected arrival timing and a suitable arrival timing (reference). Since the method was to adjust the weft insertion force according to the result of comparison with the (value), it is necessary to change the weft insertion force by changing the supply pressure to the nozzle by changing the weft (changing the initial setting) and the change at the start of weft insertion. There is a problem in that it is necessary to find a suitable arrival timing with respect to the above and perform automatic control based on it, and the work to find the suitable arrival timing is complicated.

Therefore, an object of the present invention is to provide a weft inserting device that does not need to change the reference value for comparison by changing the weft thread type and the like and can automatically adjust to the optimum weft inserting condition. .

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention winds a weft yarn around a drum and temporarily stores the weft yarn, and then draws out the weft yarn from the drum by fluid injection from a nozzle to open the warp yarn. In a fluid jet loom in which wefts are inserted inside and the wefts are locked to a locking device that protrudes into the circumferential surface of the drum, the predetermined length of the wefts is pulled out from the drum in a fluid jet loom that regulates the length of one pick The first detection device for detecting the timing, the second detection device for detecting the timing when the tip portion of the weft reaches the predetermined position on the side opposite to the nozzle, and the timing signals from the first and second detection devices. A device for outputting a weft-insertion condition change signal based on the weft insertion condition, a device for receiving the weft-insertion condition change signal and changing the weft-insertion condition ,
Detects switching of yarn feeder and outputs switching detection signal
Switching detector, and the
A weft inserting device of a fluid jet loom is provided by providing a device for changing the inserting condition to a predetermined condition .

[0006]

That is, the weft insertion condition change signal is output based on the detection timing signals from the first and second detection devices so that the relationship between these timing signals becomes substantially constant, and the weft insertion condition is changed. is there. Also, weft supply
Detects body switching and changes the weft insertion condition to the specified condition.
Corresponding to a sudden change from empty to full by changing
To do.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 and 1'denotes a frame of a loom, 2 warps, 3 back rollers, 4 healds, 5 reeds, 6 weaving cloth, 7 woven cloth, and 8 breast beams. Also, 9 is a package stand fixed to the frame 1, 10A, 10B
Is a yarn feeder, 11 is a weft yarn, 12 is a pipe-shaped air tensor for internally generating an air flow in the direction of the arrow to give tension to the weft yarn 11, 13 is a drum type weft storage device, 14 is a weft gripper,
15 is a nozzle for weft insertion, and 16 and 16 'are cutters.

The drum type weft storage device 13 is constructed as shown in FIGS. That is, the bearing is mounted on the gear box 19 fixed to the frame 1 via the stays 18A and 18B.
A hollow rotating shaft 21 is supported via 20A and 20B.
A driven gear 23 is fixed to the rotary shaft 21 by a key 22 so that the main shaft of a loom (not shown) can be rotationally driven via a transmission shaft. A yarn guide hole 24 is formed at the axial center of the rotary shaft 21, and a yarn guide tube 26 having a yarn guide portion 25 is screwed into this end and fixed by a lock nut 27. This thread guide hole
A ring-shaped air outlet is provided between 24 and the tip of the yarn guide tube 26.
29 is formed, and the air chamber 30 formed around the rotary shaft 21 is communicated with a plurality of through holes 31 formed in the rotary shaft 21. Reference numeral 32 denotes a valved nipple that supplies air to the air chamber 30, and its inlet 33 is connected to a pressure air supply source (not shown).
A drum support 35 is rotatably attached to the tip of the rotary shaft 21 via a bearing 34. The drum 37 is fixed to the drum support 35 by bolts 36. Also, the hole on the back 38
A permanent magnet 39 is fixed to this. A hole 42 is formed in the support 40 fixed to the gear box 19 so as to face the magnet 39, and a permanent magnet 43 is fixed so that a pole attracting the magnet 39 faces. The base end of the winding tube 45 is fixed to the rotary shaft 21 so as to rotate between the magnets 39 and 43.
The tip of the winding tube 45 is bent toward the drum 37.
The weft 11 is guided through a guide roller 47 fixed to a stay 46 protruding from the gear box 19, and a yarn guide portion 25, a yarn guide hole 24, and a winding tube.
It is passed through 45 and wound around drum 37. 49 is a ballooning cover, which is a bracket 48 fixed to the stay 18A.
It is fixed to. Reference numeral 50 is a first locking pin, which is a sliding body slidably fitted in a guide 51 fixed to the gear box 19.
It is fixed to 52, and its tip is tapered 37
It is designed to project into a hole 53 formed at the boundary between A and the straight portion 37B. Reference numeral 54 is a second locking pin, which is fixed to a sliding body 55 slidably fitted in the guide 51, and its tip portion is a hole formed in the straight portion 37B through the hole 74 of the cover 49. I'm trying to rush into 56. Sliders 52, 55
Rotating levers 57 and 58, which are square-shaped, are fixed to the other end of the swing lever, respectively, and are rotatably supported by a shaft 59 therein.
Cam followers 62 and 63 at the tips of 60 and 61 are fitted. The other cam followers 64 and 65 of these swing levers 60 and 61 are
A cam 67 fixed to a shaft 66 that rotates in synchronization with the main shaft of the loom,
It is abutted against 68 by springs 69 and 70. Reference numerals 71 and 72 are release levers rotatably supported on a shaft 73 for pulling out the locking pins 50 and 54 from the holes 53 and 56.

The weft gripper 14 includes a lower holding body 80 fixed to a bracket 79 protruding from the frame 1, an upper holding body 82 fixed to the upper end of a reciprocating rod 81 penetrating the lower holding body 80, and a reciprocating body. A reciprocating rod is composed of a spring (not shown) that biases the moving rod 81 downward, and is driven by a lever 88 that is driven as described later.
When 81 is pushed up, weft 11 is released. 83 and 84 are guides. Reference numeral 85 denotes a rotary shaft protruding from the gear box 19, which rotates in synchronization with the main shaft of the loom. A cam 86 is fixed to the tip of the rotary shaft 85, and the cam 86 is pivotally attached to a fixed shaft 87 protruding from the frame 1 so as to be swingable.
The cam follower 89 is contacted to drive the lever 88.

The reed 5 and the main nozzle 15 are fixed to a reed holder 90. The reed holder 90 also has a guide hole 91 and a weft escape gap.
Guides 93 (see FIG. 5) having 92 are arranged and fixed at a predetermined interval in the weft inserting direction. Here, in the drum type weft storage device 13, the timing at which the weft 11 is pulled out by a predetermined length is detected in the vicinity of the first locking pin 50 that functions as a locking device that controls the weft insertion length of the weft 11. Therefore, a first detecting device 100 for detecting that the weft 11 is locked to the locking pin 50 is provided. This first detection device 100 is fixed to a bracket 101 fixed to a gear box 19,
This is a reflection type optical detector in which a light projecting / receiving surface 102 is arranged facing a portion located when the weft 11 extends from the first locking pin 50 to the guide 83 (see FIG. 4).

Further, a second detecting device 105 for detecting that the tip of the weft 11 has reached a predetermined position on the side opposite to the nozzle of the weft inserting path is provided. The second detecting device 105 is arranged outside the two rows of warp yarns and is fixed to the reed 5, and the vertically long light emitting and receiving devices 106 and 10 are arranged with the extension of the guide hole 91 interposed therebetween.
It is a transmission type optical detector provided with 7 (refer to FIG. 5).
However, the second detection device 105 is also used as a known weft detector that detects the presence or absence of the weft 11 due to weft insertion and stops the weaving machine when there is no weft.

The pressure air is supplied to the main nozzle 15 from the pressure air supply source as shown in FIG.
110, air tank 111, and mechanical valve 11 that opens in a predetermined rotation angle range of the main shaft of the loom, that is, the weft insertion timing
It is supposed to be done through 2. The pressure regulating valve 110 as a device for changing the weft inserting condition will be described with reference to FIG. 7. The body 120 has an inlet 121 and an outlet 122.
It communicates with each other through the air introduction hole 123. A slide body 126 having a tapered portion 125 slidably supported by a slide hole 124 of the body 120 penetrates through the air guide hole 123.
126 is urged upward by a spring 127 and is tapered.
125 is designed to close the air introduction hole 123. 12
Reference numeral 8 is a diaphragm, and a pressing body 129 for pressing one end of the sliding body 126 is fixed to the central portion. 130 is also a diaphragm, and the pressure receiving body 131 is fixed to the center. Pressing body 12
An air guide hole 132 facing the pressure receiving body 131 is formed in the central portion of 9, and one end of the air guiding hole 132 is closed by an end portion 133 of the sliding body 126. Reference numeral 134 is a discharge port, and 135 is a through hole. Reference numeral 136 is a through hole that connects the air chamber 137 and the chamber 138, and is closed on the surface of the pressure receiving body 131. Entrance 12
1 and the through hole 136 are connected by a relief passage 139, and an orifice 140 is provided in the middle thereof. One end of the through hole 136 is closed by a valve seat 142 fixed to the movable coil 141. 143 is a permanent magnet, 144 is an iron core thereof, and the movable coil 141 is adapted to move downward by self-excitation by a repulsive force.

The control circuit for the movable coil 141 of the pressure regulating valve 110 is constructed as shown in FIG. In the figure, reference numeral 150 denotes an AND circuit to which the signal from the first detection device 100 and the signal from the timing signal generation circuit 151 are input. A counter 152 receives a signal from the AND circuit 150 at a set terminal and a signal from the second detection device 105 at a reset terminal. When a set signal is input, a clock 153 is used. The clock signal is clocked and reset by the reset signal to return to zero. Reference numeral 154 is a comparator, which compares the count value of the counter 152 with the preset value of the presetter 155 and outputs the result according to the comparison result. Fifteen
6 is a counter, 157 is a presetter, 158 is a delay circuit, 159 is a counter, 160 is a presetter, and 161 is provided between the yarn feeders 10A and 10B as shown in FIG. It is a switching detector that resets. 162 is a D / A converter, 163 is an operational amplifier, 16
4 is a power amplifier, which is a moving coil 1 of the pressure regulating valve 110.
It is connected to 41.

The counter 152, the clock 153, the comparator 154, the presetter 155, etc. are used to make the first and second
The device for calculating the timing difference between the detection signals from the detection devices 100 and 105 and outputting the weft insertion condition change signal when the difference exceeds a predetermined value. Further, the pressure adjusting valve 110, the counter 159 and the like receive the change signal and the nozzle
A pressure adjusting device for adjusting the supply pressure of the injection fluid to 15 is configured, and thus a device for changing the weft inserting condition is configured. The switching detection signal from the switching detector 161 is also
The counter 159 initially set by the
Change the weft insertion condition to a predetermined condition in response to the detection signal
Device is configured.

Next, the operation will be described with reference to the timing chart of FIG. During operation, weft storage device 13
Since the rotary shaft 21 of the spindle is rotated, for example, at a rotation speed four times that of the main spindle, the winding cylinder 45 rotates around the drum 37 and the weft 11 is continuously wound around the drum 37. wear. The locking pins 50, 54 retreat from the holes 53, 56 at a predetermined timing, but immediately before the start of weft insertion, the locking pins 50, 54 have the holes 53, 56.
The weft 11 is divided into four rolls between them. At the time of weft insertion, air is first jetted from the nozzle 15, and immediately after that, the second locking pin 54 is withdrawn from the hole 56 and the lever 88 is rotated to move the reciprocating rod 81 and thus the upper holding body 82. Separate from the lower clamp 80 and start weft insertion. Air jetted from the nozzle 15 is guided by the guide hole 91 of the guide element 93, and the weft 11 is wefted on the guide air flow. At this time, the weft 11 unwound from the drum 37 is the first
Each time it crosses in front of the detector 100 of the
The signal (a) is output from 100.

When weft insertion is completed, the weft 11 is locked by the first locking pin 50, so that a continuous H level signal (B) is output from the first detection device 100. Further, the timing signal generation circuit 151 periodically outputs a pulse signal (c) of a constant width at the timing when the weft 11 is locked to the first locking pin 50, and these signals (b) and (c) are output. A pulse signal (d) is output from the AND circuit 150 when is superimposed. The reason why the AND circuit 150 and the timing signal generation circuit 151 are used is to detect the rising edge of the signal (b) without detecting the signal (a).

On the other hand, the front end portion of the weft 11 is the second detection device 10
When it reaches 5, it blocks the light between the emitter and receiver 106 and 107, so
A signal (e) is output from the second detection device 105, and the weft 11
A constant signal (f) is output when the tip of the is passed. After this, beating is performed. The counter 152 is set by the rise of the signal (d), and the clock signal from the clock 153 is started to count. And this counter
The signal 152 is reset by the signal (e) from the second detection device 105 and returns to zero.

The output signal (g) of the counter 152 (which is a digital signal, but is shown as (g) in the figure for convenience) is sent to the comparator 154, and the preset value L _{1 of the} presetter 155 is set.
When it exceeds, the signal (H) is output from the comparator 154. This signal (H) is counted by the counter 156. Although the count of the counter 156 is also digitally performed, it is shown in (i) for convenience. When the count value of the counter 156 exceeds the set value L ₂ of the presetter 157, a pulse signal (nu) is output from the counter 156. This signal (i) is sent to the counter 159 and resets the counter 156 via the delay circuit 158 to return it to zero. In this example, a true change signal (nu) is output when there are a predetermined number of change signals (h).

The counter 159 is initially set to a value larger than zero by the presetter 160, and is counted down by the input of the signal (nu). This is represented by a signal (L). The output from this counter 159 is a D / A converter.
The signal is converted into an analog signal by 162 and is supplied to the movable coil 141 of the pressure regulating valve 110 via the operational amplifier 163 and the power amplifier 164.

Therefore, if the count value of the counter 159 decreases due to the signal (nu) as described above, the moving coil
The current supplied to 141 is also reduced. In the pressure control valve 110, a repulsive force is generated on the permanent magnet 143 and thus the iron core 144 by the excitation of the movable coil 141, and the valve seat 142 is pressed against the through hole 136. On the other hand, the pressure from the relief passage 139 is applied to the diaphragm 131, which presses the pressing body 129 downward, and the sliding body 12 is pressed.
6 is pushed downward, and the compressed air is discharged to the outlet 122 through between the air guide hole 123 and the tapered portion 125.

Here, when the current supplied to the movable coil 141 decreases, the pressing force of the valve seat 142 against the through hole 136 weakens, and a small force is applied to the diaphragm 131, so that the air guide hole 123 and the taper hole 123 are tapered. The gap between section 125 and section 125 becomes smaller and the pressure also decreases. Therefore, when the counter 159 counts down by one step as described above, the weft inserting condition is changed, that is, the supply pressure to the nozzle 15 is reduced, and the weft inserting force of the nozzle 15 is reduced.

Next, when the switching from the yarn feeders 10A to 10B is detected by the switching detector 161 and the signal (e) is output, the counter 159 is returned to the initial setting, so the pressure adjusting valve 110 Is also adjusted to the pressure corresponding to this. That is, in the case of the filament yarn, since the air pressure required for the fully wound yarn feeder is higher by about 1 kg / cm ² than that when the wound yarn is close to the empty yarn, the filament yarn is returned to the high pressure (signal wheel).

In this embodiment, on the assumption that the supply pressure is reduced from the full winding to the empty winding, each time the difference between the detection timings of the first and second detecting devices 100 and 105 becomes a predetermined value or more, Although the supply pressure is being reduced, if the operating pressure is higher when the bobbin is wound than when it is fully wound, the supply pressure is lowered when the yarn feeder is switched, and the supply pressure is reduced when the detection timing difference becomes large. It is better to raise it. In addition to this, fine adjustment of the supply pressure to the nozzle 15 can be performed in either high or low direction, and the pressure adjustment is performed in the direction in which the detection timing difference decreases from the previous adjustment direction and the detection timing difference increase / decrease direction. You may make it learn-control.

[0024]

As described above, according to the present invention, the weft yarn detecting devices are provided on the nozzle side and the non-nozzle side, respectively, and the timing at which a predetermined length of the weft yarn is pulled out from the drum and the anti-nozzle side are provided. Since the weft insertion condition is changed based on the timing when the tip of the weft reaches the predetermined position, the weft insertion condition can be automatically adjusted without being affected by the change of the weft type. The effect that it can be obtained. In addition, weft switching is detected and weft
By changing the insertion condition to the specified condition,
No control delay is caused by a sudden change to full winding.
Therefore, it is possible to deal with the problem.

[Brief description of drawings]

FIG. 1 is a plan view of a loom showing an embodiment of the present invention.

FIG. 2 is a plan view of a portion of the weft storage device.

FIG. 3 is a side view of a portion of the weft storage device.

FIG. 4 is a perspective view of a portion of the first detection device.

FIG. 5 is a perspective view of a portion of the second detection device.

FIG. 6 is a schematic diagram of a pressure air supply system to the nozzle.

FIG. 7 is a sectional view of a pressure control valve.

FIG. 8 is a block diagram of a control circuit of the pressure regulating valve.

FIG. 9 is a timing chart of signals in the above circuit.

[Explanation of symbols]

5 Reed 11 Weft 13 Weft storage device 15 Nozzle 37 Drum 50 First locking pin 54 Second locking pin 100 First detection device 105 Second detection device 110 Pressure adjusting valve 141 Moving coil 152 Counter 154 Comparator 155 Presetter 156 Counter 159 Counter 161 Switching detector

Claims (1)

[Claims] 1. A weft yarn is wound around a drum and temporarily stored therein, and then the weft yarn is pulled out from the drum by fluid injection from a nozzle and inserted into the warp shed. In a fluid jet loom that restricts the weft length for one pick by locking the weft, a first detection device that detects the timing when a predetermined length of the weft is pulled out from the drum, and a predetermined nozzle side A second detection device that detects the timing at which the tip of the weft reaches the position; and a device that outputs a weft-insertion condition change signal based on the timing signals from these first and second detection devices,
A device that changes the weft-insertion condition upon receiving the weft-insertion condition change signal, and detects the switching of the weft yarn feeder and detects the switching.
Switching detector that outputs an output signal and the switching detector
A weft inserting device for a fluid jet loom, comprising a device for receiving a signal and changing the weft inserting condition to a predetermined condition .