JPH0791732B2 - Fluid ejection loom controller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a controller for a fluid jet loom, and particularly controls the fluid supplied to the weft inserting nozzle or the rotational speed of the loom main spindle under optimal weft inserting conditions. Regarding the control device.

<Prior Art> Conventionally, as a control device of this type, for example, JP-A-56-96938
There is one shown in Japanese Patent Publication. This is to insert a weft into a warp opening using a plurality of nozzles supplied with a transfer fluid, and measure the transfer speed or time of the weft,
The rotation speed or the transfer speed of the loom main shaft is controlled so that the time occupies a constant portion in one cycle of the loom, which is effective for reducing weft insertion errors.

If the weft insertion conditions are exactly the same and the properties of the weft yarn are also the same, there is theoretically no difference in the time required for weft insertion. If the insertion time is compared with the reference value and the fluid supplied to the weft insertion nozzle or the rotation speed of the main shaft of the loom is controlled, weft insertion is not necessarily performed under optimal conditions. Therefore, in the apparatus of the above publication, the weft insertion times of a plurality of picks are averaged, and the control is performed based on this average value to prevent a problem caused by the variation of the difference.

<Problems to be Solved by the Invention> By the way, when acetate or nylon is used for the weft,
When controlling the supply pressure to the main nozzle, there may be a difference of about 1 kg / cm ² between the start of use (full winding) and end of use (empty winding) of the yarn feeder (weft package). all right.
In other words, weft insertion error is more likely to occur when the pressure is higher by about 1 kg / cm ² in the full winding than in the empty winding.

On the other hand, in order to improve the production efficiency, it is performed to automatically switch the yarn feeders by connecting the end of the yarn feeder being used and the tip of the yarn feeder to be used next.

Therefore, as described above, when the winding state of the yarn supplying body is switched to the next yarn supplying body and abruptly changes to the full winding state, even if it is the optimum value in the empty winding state, If the supply pressure is too low, the optimum pressure will not be reached immediately when the roll is fully wound, and the effects of variations will be caused by averaging the weft insertion times of multiple picks when measuring the weft insertion time. In the case of controlling the supply pressure to the main nozzle so as not to receive the change, the change control is not performed before the plural picks are completed even if the state is changed to the full winding state, so that there is a problem associated therewith.

That is, since it is in a fully wound state, it is necessary to supply a pressure about 1 kg / cm ² higher than that in the empty state immediately before that.
Since the extremely low pressure or the low pressure which is changed, is still supplied, the weft insertion force is small, and the weft cannot be stretched sufficiently even if weft insertion is defective or weft insertion is performed. However, the weft had insufficient tension to cause weaving defects.

Further, for example, when weft insertion time is measured and, for example, the supply pressure to the main nozzle is controlled so that it is constant, even if the pressure is controlled to the optimum pressure, it may be too strong depending on the yarn type, causing yarn breakage, It was sometimes not economical in terms of consumption.

Therefore, the present invention is capable of preventing the occurrence of weft insertion defects and weaving defects due to control delays at the time of switching the yarn feeder, and preventing the yarn breakage and energy loss. To aim.

<Means for Solving Problems> In order to achieve the above-mentioned object, the present invention, as shown in FIG. 1, is a weft-insertion-force measuring means A for measuring a weft-insertion force with respect to a weft and a measured weft. Based on the output of the control value output means B, which compares the insertion force and the reference value and outputs the control value of the fluid supplied to the weft insertion nozzle or the rotation speed of the loom main spindle in accordance with the difference, Limit value setting means D for setting a limit value for the range of the control value of the supply fluid or the loom spindle speed when the means C for changing the supply fluid to the weft insertion nozzle or the revolution speed of the loom spindle is provided. When,
A comparison means E for comparing the control value of the control value output means B with the limit value, and a rotation speed of the supply fluid or the loom spindle when the control value of the control value output means B exceeds the limit value. A limit value output means F for outputting the control value as the limit value is provided.

<Operation> That is, by the weft-insertion-force measuring means A, the weft-insertion force, specifically, the timing at which the weft-insertion force reaches a predetermined state during or after the weft-insertion, or the weft-insertion speed calculated therefrom or the time required for the weft-insertion At least a part or the tension at the end of the weft flight is measured, the control value output means B compares the measured value with the reference value, and the fluid supplied to the weft insertion nozzle or the rotation of the weaving machine spindle according to the difference. In the case of calculating and outputting the control value of the number, the limit value setting means D previously sets a limit value (upper limit value and / or lower limit value) to the range of the control value of the fluid supplied to the weft inserting nozzle and the rotation speed of the loom spindle. ) Is set and the control means of the control value output means B compares the control value with the limit value by the comparison means E, and if the control value of the control value output means B exceeds the limit value, the limit value output means By F, at that time The control value is suppressed to the limit value, and the operation is continued at this limit value.

<Examples> Examples of the present invention will be described below.

First, the overall structure of the loom will be described with reference to FIG. 1,
1'is a loom frame, 2 is a warp, 3 is a back roller,
4 is a heddle, 5 is a reed, 6 is a cloth cloth, 7 is a woven cloth, and 8 is a breast beam. Further, 9 is a yarn feeder holder fixed to the frame 1, 10A and 10B are yarn feeders (weft package) held by the yarn feeder holder 9, and 11 is a weft yarn drawn from the yarn feeder 10A. This weft 11 is passed through a pipe-shaped air tensor 12 in which an air flow in the direction of arrow a is generated, and then guided to a drum type weft storage device 14 via a guide pulley 13 and wound around the weft storage device 14. The weft thread holding device 15 that holds or releases the weft thread 11 is passed through the weft thread 11 and the main nozzle 16 for weft insertion that swings integrally with the reed 5 is drawn.

The weft storage device 14 and the weft gripper 15 will be described in more detail with reference to FIGS. 3 and 4. Gearbox 20
Are fixed to stays 21A and 21B protruding from the frame 1, and a hollow rotating shaft 22 is supported by the gear box 20 thereof. A guide pipe 23 is provided on the rotary shaft 22 in a direction away from the axis of the rotary shaft 22, and a drum 24 is rotatably supported at the tip of the rotary pipe 22. Reference numeral 25 is a magnet holder fixed to the gear box 20, and a magnet (not shown) fixed to the magnet holder.
And the magnet 26 fixed on the back of the drum 24,
The drum 24 is kept stationary even when the rotary shaft 22 rotates. The drum 24 has a conical winding portion 24A and a substantially cylindrical storage portion 24B. The drum 24 also has a protrusion hole 27 located at the boundary between the winding portion 24A and the storage portion 24B.
And a projecting hole 28 located in the storage portion 24B are formed, and the locking pins 29, 30 project into and retract from the projecting holes 27, 28. These locking pins 29,30
Is slidably fitted to a guide body 31 protruding from the gear box 20, and is reciprocally moved in the vertical direction in FIG. 34 and 35 are locking pins 2
Numeral 37 is a manual pull-out lever of 9,30 and is fitted to the shaft 36. Numeral 37 is a transmission system for transmitting power from the loom main shaft (not shown) to the gear box 20. The weft gripper 15 is fixed to a base 38 fixed to the frame 1, and a lever 42 pivotally mounted on a fixed shaft 41 is swung by a cam 40 fixed to a shaft 39 protruding from the gear box 20. Grips the weft 11 by moving the upper clamp 15B to and from the lower clamp 15A.
It is designed to be released. 43 and 44 are guides provided in front of and behind the weft gripper 15.

In this structure, the guide pipe 23 is rotated together with the rotary shaft 22 in relation to the main shaft of the loom to wind the weft 11 around the winding portion 24A of the drum 24, and the locking pins 29 and 30 are inserted into the insertion holes. It is put in and out of 27, 28 at a predetermined timing. That is, the description will be made with the time point when weft insertion is completed as a starting point.
29 is projected into the plunge hole 27, and has the shortest distance to the guide 43 on the inlet side of the weft gripper 15 after the weft 11 is locked by the locking pin 29. Next, after the locking pin 30 is inserted into the insertion hole 28, the locking pin 29 is pulled out from the insertion hole 27, and the winding portion 24
The weft 11 wound around A is moved to the storage section 24B,
After being wound around 24B a predetermined number of times, for example, four times, the locking pin 29
Rushes into the plunge hole 27 and separates from the weft 11 to be wound thereafter. Then, when the weft insertion timing comes, the weft gripper 15 releases the weft 11, the locking pin 30 is pulled out from the entry hole 28, and the weft 11 is wefted by the air injection from the main nozzle 16. At this time, the weft 11 wound around the storage section 24B
This is rewound four times around this and is rewound, and is locked by the locking pin 29 to complete the weft insertion. After this, the weft grasper 15
To hold.

An outline of the control system according to the present invention when applied to such a loom is shown in FIG.

Referring to FIG. 5, to the main nozzle 16, an electric-pneumatic proportional valve 45 having a function of adjusting an air pressure proportional to an electric signal from a pressure air supply source, stores an air amount corresponding to approximately one pick. An air tank 46, a solenoid valve 47 that is opened by turning on the start preparation switch of the loom and closed by stopping the loom, and a cam 48 that rotates in conjunction with the main shaft of the loom open at a predetermined time of the weaving cycle, that is, a weft insertion time. Pressure air is supplied through the mechanical valve 49. 50 is a pressure gauge. Here, the electric-pneumatic proportional valve 45 corresponds to a means for changing the pressure of the air supplied to the main nozzle 16 for weft insertion, and the electric-pneumatic proportional valve 45 receives a digital signal from the control circuit 51 D /. It is converted into an analog voltage via the A converter 52 and input.

The control circuit 51 has, as control inputs, a signal from an unwinding detector 53 as a weft inserting force measuring means and an angle sensor 58.
And the signal from the presetter 60 are input. Further, although not shown, a signal from a proximity switch that outputs a signal for each rotation of the main shaft of the loom is also input.

The rewinding detector 53 detects the passage of the weft 11 that is rewound around the drum 24 at the time of weft insertion, and as shown in FIG. 6, it has an optical fiber having a light projecting surface 54 and a light receiving surface.
An optical fiber having 55 is bundled, and their light emitting / receiving surfaces 54, 55 are connected from the locking pin 30 of the storage portion 24B of the drum 24 to the main nozzle 16 as shown in FIGS. 7 and 8.
Side part and unwinding direction of the weft 11 (direction of FIG. 7b)
In the above, it is fixed to a bracket 56 (see FIGS. 3 and 4) fixed to the gear box 20 so as to be opposed to the portions immediately before the locking pins 29 and 30. The rewind detector 53
The axis of the is orthogonal to the axis of the drum 24. The drum 24 is made of aluminum, and the surfaces of the winding portion 24A and the storage portion 24B are ceramic sprayed to prevent the weft 11 from slipping. With respect to the portion of the drum 24 facing the above, the aluminum surface is exposed by removing the ceramic spraying, and the buffing is performed to finish the mirror surface 57 (see FIG. 7).

In this way, the light emitted from the light emitting surface 54 is constantly emitted from the drum 24.
The light is reflected by the mirror surface 57 and enters the light receiving surface 55. When the weft 11 is unwound, the weft 11 projects the light receiving and receiving surfaces 54,5.
When passing between 5 and the mirror surface 57, the light beam is blocked and the light receiving surface 55
The amount of light incident on is reduced, and the passage of the weft 11 is detected by this. If the weft 11 is wound around the drum 24 four times as one pick, the detection signal due to the passage of the weft 11 is obtained each time the winding is rewound, and thus is obtained four times until the weft insertion is completed. The selected one of these is used for control.

The angle sensor 58 rotates in conjunction with the loom main shaft and is made to face a rotating body 59 having 360 convex portions on its periphery, and detects the convex portion to detect the rotation angle of the main spindle (hereinafter referred to as the main spindle angle). . Each time a convex portion is detected, it is incremented by 1 °, and 0 ° is output after 359 °.

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

Reference numeral 61 is a rewinding timing display for displaying the spindle angle when the weft 11 is detected by the rewinding detector 53, and a predetermined number of light emitting diodes 62 are arranged in line along the angle scale, and a control circuit is provided.
The light emitting diode 62 of the corresponding angle emits light by the signal from 51. In this case, the light emitting diode 62 is provided at every 5 ° so that the light emitting diode 62 at an angular position close to the actually measured value emits light. Reference numeral 63 is a light emitting diode provided in correspondence with the approximate angular position at each rewinding frequency, which indicates how many times the rewinding detection signal is used for control. Further, the display 61 is provided with a digital display section 64 for displaying the supply pressure to the main nozzle 16, that is, the digital output to the electric-pneumatic proportional valve 45.

Here, the control circuit 51 performs predetermined processing based on the control inputs from the rewind detector 53, the angle sensor 58, and the presetter 60, and outputs it to the D / A converter 52 and the display 61, and outputs the electric signal. Controlling the supply pressure to the main nozzle 16 via the air pressure proportional valve 45 and performing a predetermined display.

Specifically, this control circuit 51 is provided with a CPU 6 as shown in FIG.
5, ROM66, RAM67, I / O 68, 69 and drivers 70, 71, and a rewinding detection signal from the rewinding detector 53 and an angle sensor 58.
Read the spindle angle signal from, the reference angle setting value T ₀ from the presetter 60, the allowable range setting value LM, the initial pressure setting value V, the pressure upper limit setting value Va and the pressure lower limit setting value Vb into the CPU 65 via the I / O 68. , RAM67 with necessary data according to the program on ROM66
To and from the D / A converter 52 via I / O 69
And to the timing display light emitting diode 62 and the pressure display digital display section 64 via the drivers 70 and 71.

In this example, the control circuit 51 is provided with the functions of a control value output means, a limit value comparison means, and a limit value output means as software.

Next, the operation of this system will be described with reference to the flowcharts of FIGS.

First, when the power of the loom is turned on, the number of star topics SP and the cumulative values ΣT and ΣP which will be described later are cleared, and the voltage value corresponding to the output from the D / A converter 52 set up to then is set in the driver 71. It is displayed on the digital display section 64 for displaying the pressure (step S1 in the flow of FIG. 10). Here, the voltage value is set to match the pressure value.

Next, it is determined whether or not information is being read from the presetter 60 (reading switch ON) (step S2), and when various conditions are newly set or changed in the reading state, as shown in FIG. And according to the flow of FIG. 12, those conditions are input from the presetter 60. Here, the presetter 60 constitutes a limit value setting means.

That is, for example, the binary switch 60 of the presetter 60
When a is 0, the number of rewinding times to be selected is set, and at that time, the current number of times (1 to 1
After displaying 4), it is determined whether or not a new value is to be written (write switch ON), and if so, the value set by the three decimal switches 60b is written and stored in the RAM 67. That is, to set the number of times, the binary switch 60b is set to 0, the decimal switch 60b is set to "004" for the fourth time, and the write switch is turned on. As a result, T ₀ is set to the conventional reference value according to the number of times.

To change this, set the binary switch 60a to 4 and the decimal switch 60b to "230", for example.
Set to (indicates angle) and turn on the write switch.

Binary switch 60a when setting the allowable range LM
Is set to A, and the decimal switch 60b is set to "100", for example.
Set it to and turn on the write switch. Also,
Binary switch 60a to set the initial pressure V
Is set to B, the value is set by the decimal switch 60b, and the write switch is turned on. Furthermore, when setting the upper limit value Va of pressure, the binary switch 60
It is sufficient to set a to C, set the value with the decimal switch 60b, and turn on the write switch. Furthermore, when the lower limit value Vb of the pressure is set, the binary switch 60a may be set to D and the same operation may be performed.

Next, when the operation switch of the loom is turned ON, the pick number SP from the start is determined (steps S3, S4). Up to the second pick, the presence / absence of a signal from the proximity switch is determined (step S5), and when there is a signal, the number of star topics SP is counted up (step S6), and the process waits for the third pick. In this way, the pressure control and the reading of information for the pressure are not performed up to the second pick, and the process waits until the predetermined number of revolutions is reached and becomes stable. At this time, the injection is performed at the initial pressure V.

After the third pick, when the weft 11 is unwound from the drum 24 during weft insertion, a preselected signal, for example, the fourth signal among the signals from the rewind detector 53 that is generated each time the weft 11 is unwound by one turn. Is read, the spindle angle signal T from the angle sensor 57 is read, the reference value T ₀ is subtracted from the value, and
The difference (T−T ₀ ) is obtained, and the cumulative value ΣT of the difference is calculated. At the same time, Σ showing the number of picks since the accumulation started
The value of P 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 to be visualized.

Next, it is determined whether the cumulative value ΣT of the difference (T−T ₀ ) exceeds the plus side or minus side allowable range LM (for example, ± 100) (steps S8 and S9).

If the allowable range on the plus side is exceeded, the current pressure (or the initially set initial pressure) V is divided by the number of picks ΣP (eg 10) until the allowable range is exceeded, and this is added to the current pressure V. And set a new pressure V (step S1
0). Next, the set pressure V is compared with the upper limit value Va (step S11), and if it is larger than the upper limit value Va, the upper limit value Va
Is set to (step S12).

If the allowable range on the minus side is exceeded, the current pressure V is divided by the number of picks ΣP until the allowable range is exceeded, and this is subtracted from the current pressure V to set a new pressure V (step S13). ). Next, the set pressure V is compared with the lower limit value Vb (step S14).
The lower limit value Vb is set (step S15).

The pressure V as the control value newly set in this way
Is output to the D / A converter 52 and displayed on the digital display unit 64. At the same time, ΣT and ΣP are cleared (step S16). In this example, steps S7, S8, S9, S10, S1
The part 3 corresponds to the control value output means, the steps S11 and S14 correspond to the limit value comparison means, and the steps S12 and S15
The part of corresponds to the limit value output means.

In this way, when the cumulative value ΣT of the difference between the detected value T at the predetermined rewinding timing and the reference value T ₀ exceeds the allowable range LM on the plus side, the weft insertion time is too long, and it is necessary to exceed it. The supply pressure V to the main nozzle 16 is increased by an amount corresponding to the pick number ΣP, and the traction force is increased to optimize the weft insertion time.

On the contrary, if the allowable range on the minus side-LM is exceeded, the weft insertion time is too short, so the number of picks required to exceed ΣP
According to the above, the supply pressure V to the main nozzle 16 is reduced, the traction force is reduced, and the weft inserting time is optimized.

Of course, if it is within the allowable range, the previous pressure is continued. When the operation switch is turned off, the number of star topics SP is cleared (step S17) and the system stands by.

Here, when the yarn supplying body 10A moves from the full winding state to the empty winding state, the pressure V gradually decreases due to the pulling resistance of the weft 11, and becomes smaller than the lower limit value Vb before the empty winding state. However, in this case, the pressure V remains held at the lower limit value Vb as described above. Therefore, even if the pressure in the idle winding state is maintained until the yarn winding body 10B is switched to the full winding state and the accumulated value exceeds the allowable range, the pressure V becomes the lower limit value in the idle winding state. Since it is held at Vb, the pressure V is not so low when switching to the full winding state,
The degree of occurrence of weft insertion defects and weaving defects is significantly less than in the past. Therefore, the lower limit value Vb is set to a value within which weft insertion errors do not occur and no defects occur.

Further, the upper limit value Va can be prevented by setting it in a range in which yarn breakage and air loss do not occur.

However, either one of the upper limit value Va and the lower limit value Vb may be selected and used as required.

In these examples, the time required for weft insertion is measured as an indication of the weft insertion force, and for this reason, the timing of reaching a predetermined state during weft insertion or at the end is detected. The tension at the end of the flight, specifically, the tension when the weft 11 is locked to the locking pin 29 of the drum type weft storage device 14 at the end of the flight, for example, a strain gauge is attached to the locking pin 29. It is also possible to measure by detecting the distortion.

Further, in these embodiments, the supply pressure to the main nozzles is controlled, but in the case of the air injection type loom, the supply pressure to the auxiliary nozzles and the injection time may be controlled. Further, the number of rotations of the main shaft of the loom may be controlled so that the time required for weft insertion becomes a constant ratio in the weaving cycle.

<Effects of the Invention> As described above, according to the present invention, the range of the control value of the fluid supplied to the weft inserting nozzle or the rotational speed of the main shaft of the loom is limited. To prevent weft insertion failure and weaving due to the delay of control in
Further, it is possible to obtain an effect that continuous operation is possible while preventing yarn breakage and energy loss can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention. 2 to 12 show one embodiment of the present invention, FIG. 2 is a plan view of a loom, FIG. 3 is a plan view of a weft storage device, FIG. 4 is a side view of the weft storage device, and FIG. FIG. 6 is a system configuration diagram, FIG. 6 is an enlarged view of a rewinding detector, FIGS. 7 and 8 are front and side views showing a layout of the rewinding detector, and FIG. 9 is a hardware configuration of a control circuit. FIG. 10 is a block diagram showing FIG.
The figure is a flowchart showing the control contents. 11 …… Weft, 14 …… Weft storage device, 16 …… Main nozzle, 24
...... Drum, 29,30 ...... Locking pin, 45 ...... Electro-pneumatic proportional valve, 51 ...... Control circuit, 53 ...... Rewinding detector, 58 ......
Angle sensor, 60 ... Presetter

Claims (1)

[Claims] 1. A weft inserting nozzle (16) for inserting a weft (11) into a warp opening, and a weft inserting force measuring means (A, 53) for measuring a weft inserting force with respect to the weft (11), and measurement. Control value output means (B, 51) for comparing the weft insertion force and the reference value, and outputting the control value of the fluid supplied to the weft insertion nozzle (16) or the rotational speed of the loom main spindle, according to the difference between them. Based on the output of this control value output means, the weft insertion nozzle (1
A fluid injection type loom having means (C, 45) for changing the supply fluid to the 6) or the rotation speed of the loom spindle, and setting a limit value for the control value range of the supply fluid or the loom spindle speed. Limit value setting means (D, 60), comparing means (E, 51) for comparing the control value of the control value output means with the limit value, and the control value of the control value output means sets the limit value. And a limit value output means (F, 51) for outputting the control value of the supply fluid or the rotation speed of the loom main shaft to the limit value when the fluid is exceeded.