JPS6134256A - Controller 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 (Industrial Application Field) The present invention relates to a control device for a fluid injection type loom, particularly for controlling the fluid supplied to a weft insertion nozzle or the rotation speed of the loom main shaft to achieve optimal weft insertion conditions. Regarding a control device.

“〈Prior art〉 As a conventional control device of this kind, for example,
There is one shown in Publication No. 938. This involves inserting the weft yarn into the warp shedding using a plurality of nozzles supplied with a transfer fluid, and measuring the weft transfer speed or time, which occupies a fixed portion of one cycle of the loom. This is to control the rotational speed or transfer speed of the main shaft of the loom, and is effective in reducing weft insertion errors.

(Problems to be Solved by the Invention) However, with this device, the weft and yarn transfer speed are measured, and based on the measurement results, the loom is machined by measuring the weft and yarn transfer speed for each pick or by averaging a plurality of measurement results. The rotational speed or transfer speed of the main shaft is controlled, but in the early stages of operation immediately after the loom starts rolling, the loom is on the way to reaching a predetermined rotational speed, so the operating speed of the loom is slower than the predetermined operating speed. , Weft insertion is performed normally, so one of the main shafts of the loom
Since the angle required for weft insertion during rotation becomes extremely small, controlling the fluid pressure to the nozzle and the rotation speed of the loom main shaft based on this angle would lengthen the time required for weft insertion. , the fluid pressure to the nozzle is lowered or the rotational speed of the loom main shaft is increased, so the angle required for weft insertion during one revolution of the loom main shaft becomes larger during the next weft insertion, and the weft cannot be inserted within the weft insertion period. There was a problem in that the weft insertion was not completed and the warp threads got caught, resulting in errors in weft insertion.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems caused by control during the initial stage of operation of a loom.

Means for Solving the Problems> In order to achieve the above object, the present invention, as shown in FIG. When equipped with a control means B that compares the input force with a reference value and controls the fluid supplied to the weft insertion nozzle or the rotational speed of the loom main shaft according to the difference, the actual measured value of the weft insertion force is determined at the initial stage of operation of the loom. An initial operation control stop means is provided to temporarily stop the control based on the comparison between the control value and the reference value.

In other words, the weft insertion force measuring means A measures the weft insertion force, specifically, the timing at which a predetermined state is reached during or at the end of weft insertion, or the weft insertion speed or the time required for weft insertion calculated from that time. The tension at least in part or at the end of the weft flight is measured, and the control means B compares the measured value with a reference value and adjusts the fluid supplied to the weft insertion nozzle or the rotational speed of the loom main shaft according to the difference. In the 4th go to control,
At the beginning of the operation of the loom, specifically, for a predetermined number of picks or a predetermined time immediately after starting, the initial operation control stop means C stops the control performed by the control means B by comparing the actual measured value and the reference value. be.

(Example) The present invention will be explained in detail below.

First, the overall structure of the loom will be explained with reference to FIG. 1.
1' is the frame of the loom, 2 is the warp, 3 is the puff crawler, 4 is the heddle, 5 is the reed, 6 is the loom, 7 is the woven fabric, and 8 is the pressed beam. Also, 9 is a package holder, IOA, fixed to frame 1.

10B is a weft package held by the package holder 9, and 11 is a weft drawn out from the package IOA. After this weft yarn 11 is passed through a pipe-shaped air tensor 12 to generate an air flow in the direction of arrow a inside,
The weft 11 is guided through a guide pulley 13 to a drum-type weft storage device 14, wound there, and at a predetermined timing.
The main nozzle 16 for inserting the weft swings together with the reed 5.

The weft storage device 14 and the weft gripper 15 will be described in more detail with reference to FIGS. 3 and 4.

A stay 21 that the gear box 20 protrudes from the frame 1
A, 21B, the gear box 20 supports a hollow rotating shaft 22, and the zero rotating shaft 22 has a guide pipe 23 protruding away from the axis.
Further, a drum 24 is supported at the leading end so as to be relatively rotatable. 25 is a magnet holder fixed to the gear box 20, and a magnet (not shown) fixed to it and the drum 24
The rotating shaft 22 is placed opposite the magnet 26 fixed on the back side of the
The drum 24 is designed to remain stationary even when the drum 24 rotates. The drum 24 is formed with a conical winding portion 24A and a substantially cylindrical storage portion 24B. The drum 24 is also formed with a plunge hole 27 located at the boundary between the winding part 24A and the storage part 24B, and a plunge hole 28 located in the storage part 24B. The locking pins 29 and 30 are designed to move in and out.

These locking pins 29, 30 are slidably fitted into guide bodies 31 protruding from the gear box 20, and are moved up and down as shown in FIG. is reciprocated in the direction. 34.35 is the locking bottle 29.30.
This is a manual pull-out lever and is fitted onto the shaft 36.

37 is a transmission system that transmits power from the loom main shaft (not shown) to the gear box 20. The weft gripper 15 is attached to the frame 1
It is fixed to a base 38 fixed to the gear box 2.
A lever 42 pivotally connected to a fixed shaft 41 is swung by a cam 40 fixed to a shaft 39 projecting from 0, and the lever 42 moves the upper clamping body 15B toward and away from the lower clamping body 15A, thereby gripping the weft yarn 11.・I am trying to release it.

43 and 44 are guides provided before and after the weft gripper 15.

In this thing, the rotating shaft 22 is connected to the main shaft of the loom.
At the same time, the guide pipe 23 rotates and the winding portion 2 of the drum 24 is rotated.
While winding the weft 11 around 4A, the locking pins 29 and 30
are inserted into and removed from the entry holes 27 and 28 at predetermined timing. That is, if we explain from the point in time when weft insertion is completed, first, when weft insertion is completed, the locking pin 30 has been pulled out from the plunge hole 28, the locking pin 29 has plunged into the plunge hole 27, and the weft 11 After the locking pin 30 is locked by the locking pin 29, the locking pin 30 takes the shortest distance to the guide 43 on the entrance side of the weft gripper 15. Next, the locking pin 30 enters the plunge hole 2nd, and then locks. The pin 29 is pulled out from the plunge hole 27, the weft 11 wound around the winding part 24A is transferred to the storage part 24B, and after being wrapped around the storage part 24B a predetermined number of times, for example, four times, the locking pin 29 is inserted. It enters the hole 27 and separates from the weft yarn 11 that will be wound thereafter. When it is time to insert the weft, the weft gripper 15 releases the weft 11, the locking pin 30 pulls out from the plunge hole 28, and the weft 11 is inserted by air jet from the main nozzle 16. At this time, storage section 24B
The weft yarn 11 that has been wound around the weft thread is unwound four times around this area, and is then stopped by the locking pin 29 to complete the weft insertion.

After this, the weft yarn gripper 15 grips the weft yarn 11.

FIG. 5 shows an outline of the control system according to the present invention when applied to such a loom.

Referring to FIG. 5, the main nozzle 16 is connected to an electric-pneumatic proportional valve 45, which has the function of supplying air pressure from a pressurized air supply source to an air pressure proportional to an electric signal, and stores an amount of air equivalent to approximately one vacuum. an air tank 46 that opens when the loom start preparation switch is turned on, and a solenoid valve 471 that opens when the loom is stopped and closes when the loom stops; a cam 4 that rotates in conjunction with the loom main shaft.
8, pressurized air is supplied through a mechanical valve 49 that opens at a predetermined time in the weaving cycle, that is, at the weft insertion time. 50 is a pressure gauge. Here, a digital signal from the control circuit 51 is converted into an analog voltage and input to the electro-pneumatic proportional valve 45 via the D/A converter 52 .

The control circuit 51 receives, as control inputs, a signal from the rewinding detector 53 as a weft insertion force measuring means, a signal from the angle sensor 58 and the proximity switch 75, and a signal from the pre-seven phthalo 0. Ru.

The unwinding detector 53 detects the passage of the weft yarn 11 being rewound around the drum 24 during weft insertion, and has an optical fiber having a light projecting surface 54 and a light receiving surface 55 as shown in FIG. Optical fibers are bundled, and their light emitting/receiving surfaces 54 and 55 are connected to the main nozzle 16 side from the locking pin 30 of the storage section 24B of the drum 24, as shown in FIGS. 7 and 8. And in the unwinding direction of the weft 11 (the direction shown in Fig. 7), the locking pin 29.3
0, gear box 2
Bracket 56 fixed at 0 (see Figures 3 and 4)
It is fixed to .

Note that the axis of the rewind detector 53 is orthogonal to the axis of the drum 24. Further, the drum 24 is made of aluminum, and its winding portion 24
A and the storage section 24B are coated with ceramic spraying to prevent the weft 11 from slipping, but the unwinding detector 53
Regarding the portion of the drum 24 facing the projection/reception surfaces 54 and 55, the ceramic spraying is removed to expose the aluminum surface, which is then puff polished to a mirror surface 57 (see FIG. 7).

In this way, the light projected from the light emitting surface 54 is normally reflected by the mirror surface 57 of the drum 24 and enters the light receiving surface 55, and as the weft 11 is unwound, the weft 11 is transferred to the light emitting/receiving surface 55. 55 and the mirror surface 57, the light beam is blocked and the amount of light incident on the light receiving surface 55 is reduced, and this is used to detect the passage of the weft 11. Incidentally, if the weft yarn 11 is wound around the drum 24 four times for one bit, the detection signal due to the passage of the weft yarn 11 is obtained every time it is unwound one turn, so it can be obtained four times until the weft insertion is completed. A selected one of them is used for control.

The angle sensor 58 is connected to a rotating body 59 that rotates in conjunction with the main shaft of the loom and has 360 protrusions around the loom.
The rotation angle of the main shaft (
(hereinafter referred to as the main axis angle). In addition, each time a convex part is detected, the count is increased by 1 degree, and after 359 degrees -, it is 0.
It should output °. In addition, the proximity switch 75
is placed opposite to a rotating body 76 which rotates in conjunction with the loom main shaft and has a single convex portion around its periphery, and is designed to emit a signal every time the loom main shaft rotates.

The presetter 60 is provided to preset information necessary for control in the control circuit 51, and includes a binary switch 60a capable of hexadecimal input, three decimal switches 60b, and the like.

Reference numeral 61 denotes a rewind timing indicator that displays the main shaft angle when the weft 11 is detected by the rewind detector 53. A predetermined number of light emitting diodes 62 are arranged in a row along the angle scale, and The light emitting diode 62 at the corresponding angle emits light according to the signal.

In this case, light emitting diodes 62 are provided every 5°,
The light emitting diode 62 at the angular position close to the actual measurement value is designed to emit light. Reference numeral 63 denotes a light emitting diode provided corresponding to the approximate angular position at each rewinding number, which indicates which rewinding detection signal is used for control. The display 61 is also provided with a digital display section 64 that displays the supply pressure to the main nozzle 16, that is, the digital output to the electro-pneumatic proportional valve 45.

Here, the control circuit 51 includes a rewind detector 53° angle sensor 58 . Proximity switch 75 and presetter 6
Based on the control input from 0, the D/A
It outputs to the converter 52 and the display 61, controls the supply pressure to the main nozzle 16 via the electro-pneumatic proportional valve 45, and displays a predetermined display.

Specifically, as shown in FIG.
PU65. ROM66, RAM67, l1068°69
and drivers 70 and 71, which receive a rewind detection signal from the rewind detector 53, a main shaft angle signal from the angle sensor 58, a main shaft rotation signal from the proximity switch 75, and a reference angle setting value TO2 allowance from Buri-Nanaphthalo 0. Range setting value LM
and the initial pressure setting value V to the CPU 65 via l1068.
According to the program on the ROM 66, necessary data is written to the RAM 67, read again, and output to the D/A converter 52 via the l1069, and the driver 7
Light emitting diode 62 for timing display via 0.71
and is output to the pressure display digital display section 64.

In this example, the control circuit 51 constitutes a control means together with the electro-pneumatic proportional valve 45, and also has a function as an operation initial control means in the form of software.

Next, the operation of this system will be explained with reference to the flowcharts shown in FIGS. 10 to 12.

First? When you turn on the power of machine a, the start pink number SP
Clears cumulative values ΣT and ΣP, which will be described later, and displays the voltage value corresponding to the output from the D/A converter 52 that has been set so far on the digital display section 64 for pressure display via the driver 71. (Step S1 of the flow in FIG. 10), here the voltage value is set to match the pressure value.

Next, it is determined whether or not the information is read from the precenter 60 (reading switch ON) (step S2);
In the reading state, if various conditions are to be newly set or changed, those conditions are inputted from the presetter 60 according to the flowcharts shown in FIGS. 11 and 12.

That is, for example, when the binary switch 60a of the presafeter 60 is set to 0, it is a case where the number of rewinding times to be selected is selected, and in that case, the current number of rewinding times (
1 to 4), it is determined whether to write a new value (write switch ON), and if writing, the value set by the three decimal switches 60b is transferred to the RAM.
67 and store it. In other words, when setting the number of times, the binary switch 60b is set to 0, and the decimal switch 60b is set to "0" for the fourth time.
04" and turn on the write switch.

As a result, To is set to the previous reference value depending on the number of times.

If you want to change this, then binary - switch 60
Set a to 4 cents, and set the decimal switch 60b to r, for example.
Set it to 230J (representing the angle) and turn on the write switch.

When kitting the tolerance range LM, use binary switch 6.
0a to A, set the decimal switch 60b to, for example, rloooJ, and turn on the write switch. Also, when setting the initial pressure V, use binary -
Set the switch 60a to F, and turn off the decimal switch 60.
Just set the value using b and turn on the write switch.

Next, when the operation switch of the loom is turned on, the number of picks SP from the start is determined (step S3゜34).Up to the second pick, the presence or absence of a signal from the proximity switch 75 is determined (step S5), and the presence or absence of a signal is determined. At the same time, the start pink number SP is counted up (step S6) and waits for the third pick. In this way, until the second pick, pressure control and reading of information for that purpose are not performed, and the engine waits until the predetermined rotational speed is reached and stabilized.In this case, injection is performed at the initial pressure V.

From the 3rd pick onward, the weft 11 is removed from the drum 24 during weft insertion.
When the is rewound, the main shaft angle signal from the angle sensor 57 at the time when a pre-selected signal from the rewind detector 53, for example, the fourth signal, which is generated every time the rewind is rewound one round, is input. T is read, the reference value T0 is subtracted from the value, the difference (T-To) is obtained, and the cumulative value ΣT of the difference is calculated.

At the same time, the value of ΣP indicating the number of bigs since the start of accumulation is incremented by 1 (step S7). Here, the light emitting diode 62 corresponding to the main axis angle signal T is caused to emit light and visualized.

Next, it is determined whether the cumulative value ΣT of the difference (TTo) exceeds the tolerance range LM (for example, ±100) on the plus or minus side (steps S8 and S9).

If the allowable range on the plus side is exceeded, divide the current pressure (or the initially set initial pressure) by the number of picks ΣP (for example, 10) until the allowable range is exceeded, and add this to the current pressure V. and set a new pressure V (step 51
0).

If the negative tolerance is exceeded, divide the current pressure V by the number of picks ΣP until the tolerance is exceeded, and subtract this from the current pressure V.1. A new pressure V is set (step 5ll).

The newly set pressure V in this way is output to the D/A converter 52, and is also output to the digital table and the receiving part 64.
will be displayed. At the same time, ΣT and ΣP are cleared (step 512).

In this way, the cumulative value ΣT of the difference between the detected value T at the predetermined rewinding timing and the reference value T0 is within the positive tolerance range LM.
If the weft insertion time is exceeded, the weft insertion time is too long, so increase the supply pressure V to the main nozzle 16 by an amount corresponding to the number of picks ΣP required to exceed it, increase the traction force, and set the weft insertion time to an appropriate value. become

On the other hand, if the negative tolerance range - LM is exceeded, the weft insertion time is too short, and the number of picks required to exceed the weft insertion time Σ
The supply pressure V to the main nozzle 16 is reduced by an amount corresponding to P, the traction force is reduced, and the weft insertion time is optimized.

Of course, if the pressure is within the allowable range, the previous pressure is continued. If the operation switch is turned off, the start pick number SP is cleared (step 313) and the machine waits.

FIG. 13 shows another embodiment. In this embodiment, the same parts as in the above embodiment are given the same reference numerals.

80 is a clock pulse generator that outputs pulses at predetermined time intervals. A counter 81 resets the previous count value by opening the weft gripper 15, starts counting the number of pulses from the clock pulse generator 80 anew, and starts counting the number of pulses from the clock pulse generator 80. The counting operation is stopped by the first weft detection signal from the detector 82, and the count value at that time is sent to the comparator 83. The comparator 83 compares the count value with a reference value preset in the setter 84 and sends the comparison value to the D/A converter 52. The electro-pneumatic proportional valve 45 adjusts the air pressure in proportion to the voltage supplied from the D/A converter 52 and the constant voltage output circuit 85. 86 is a proximity switch that detects the high portion of the cam 48 and sends its output to a counter 87. When this counter 87 receives a signal from the proximity switch 86, for example twice, it outputs it to the relay coil 88 and comparator 8.
3 and the D/A converter 52 is closed.

Next, the effect will be explained. When the weft gripper 1.5 opens due to the weft insertion operation immediately after starting, the counter 81 is reset and starts counting pulses from the clock pulse generator 80. When the weft detector 82 detects the arrival of the tip of the weft 11, the counter 81 stops counting, and the count value up to that point is transferred to the comparator 83.
send to This comparator 83 compares it with the reference value of the setter 84 and attempts to send the comparison value to the D/A converter 52 via the contact 89, but since the counter 87 has not yet counted 2, the contact 89 remains open, and the D/A converter 52 does not operate. At this time, the electro-pneumatic proportional valve 45 is adjusted to the pneumatic pressure determined by the voltage from the constant voltage output circuit 85. cam 48
When the high part of the signal faces the proximity switch 86, the proximity switch 86 outputs one pulse and sends it to the counter 87. cam 48
Since the loom rotates in synchronization with the main shaft of the loom, the proximity switch 86 outputs one pulse for each rotation of the main shaft.

This pulse is counted by a counter 87, and after two rotations of the loom main shaft, the relay coil 88 is actuated to close the contact 89. As a result, the output from the comparator 83 at the third rotation of the main shaft is input to the D/A converter 52. The output of this D/A converter 52 and the output from the constant voltage output circuit 85 are combined and the electric-pneumatic proportional valve 45
The air pressure is adjusted according to this voltage value.

In these embodiments, the time required for weft insertion is measured as an expression of weft insertion force, and the timing at which a predetermined state is reached during or at the end of weft insertion is detected. The tension at the end of the flight, specifically, the tension when the weft 11 is locked on the locking pin 2♀ of the drum-type weft storage device 14 at the end of the flight, can be measured by, for example, using a strain gauge on the locking pin 29. Measurement may also be carried out by attaching it and detecting its distortion.

In addition, in these embodiments, the supply pressure to the main nozzle was controlled, but in the case of an air injection type loom, the supply pressure and injection time to the auxiliary nozzle may be controlled. The rotational speed of the main shaft may be controlled so that the time required for weft insertion is a constant proportion of the weaving cycle.

Furthermore, in these embodiments, the control is stopped until a predetermined big weft insertion is performed after the start, but a timer may be used to stop the control until a predetermined time has elapsed after the start.

<Effects of the Invention> As explained above, according to the present invention, the fluid supplied to the weft inserting nozzle or the rotational speed of the loom main shaft is not controlled based on measured data that does not match the actual situation at the initial stage of operation immediately after the start of the loom. This has the effect of reducing the occurrence of weft insertion errors.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention. Figures 2 to 12 show an embodiment of the present invention, in which Figure 2 is a plan view of the loom, Figure 3 is a plan view of the weft storage device, Figure 4 is a side view of the weft storage device, and Figure 5 is a side view of the weft storage device. The figure is a system configuration diagram, Figure 6 is an enlarged view of the rewind detector, Figures 7 and 8 are front and side views showing the layout of the rewind detector, and Figure 9 is the hardware configuration of the control circuit. Block diagram showing the first
0 to 12 are flowcharts showing control details. FIG. 13 is a system configuration diagram showing another embodiment. 2... Warp 11... Weft 14... Weft storage device 16... Main nozzle 24... Drum 2
9.30... Locking pin 45... Electric-pneumatic proportional valve 51... Control circuit 53... Rewinding detector
58...Angle sensor 60...Presetter
75... Proximity switch 82... Weft detector
83...Comparator 86...Proximity switch 89...
・Contact Patent Applicant: Nissan Motor Co., Ltd. Agent Patent Attorney: Fujishii Sasashima Figure 6 Figure 8

Claims (1)

[Claims] Weft insertion nozzle (1) that inserts the weft (11) into the warp opening
6), and a weft insertion force measuring means (A, 53, 82) for measuring the weft insertion force against the weft yarn (11), and a weft insertion force measuring means (A, 53, 82) for measuring the weft insertion force against the weft (11), and comparing the measured weft insertion force with a reference value and measuring the weft according to the difference. In a fluid injection loom equipped with a control means (B, 45, 51, 83) for controlling the fluid supplied to the insertion nozzle (16) or the rotation speed of the loom main shaft, the actual measured value of the weft insertion force is determined at the beginning of operation of the loom. A control device for a fluid injection type loom, characterized in that it is provided with operation initial control stop means (C, 51, 89) for temporarily stopping control based on a comparison between the current value and a reference value.