JPH081020B2 - 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-56-9693
There is one shown in Japanese Patent Publication No. 8. In this method, a plurality of nozzles supplied with a transfer fluid are used to insert a weft into a warp opening, the transfer speed or time of the weft is measured, and the time occupies a certain portion in one cycle of a loom. As described above, the number of revolutions of the loom main shaft or the transfer speed is controlled, which is effective for reducing weft insertion errors.

<Problems to be Solved by the Invention> In this device, in order to measure the weft transfer speed or time, the weft transfer path, that is, the time from the main nozzle until the tip of the weft reaches A weft yarn detector is provided to detect the arrival timing. There are various types of weft yarn detectors such as photoelectric type and electrostatic type.
Since it is difficult to detect the arrival of the tip of the weft in the course of weft insertion, that is, in the warp row, it is difficult to detect the arrival of the tip of the weft,
The arrival of the tip of the weft is detected outside the warp row on the side opposite to the weft insertion side, and is usually used for controlling the rotational speed of the loom main spindle or the supply pressure to the main nozzle.

In this case, a weft detector for stopping the weaving machine is provided on the outer side of the warp row on the side opposite to the weft insertion side in the case of a weft insertion error. It is necessary to adjust the sensitivities to match the detection of the arrival timing, and it is preferable to make the processing system independent.

However, if they are made independent, the two weft yarn detectors are arranged on the outer side of the warp yarn line on the opposite weft insertion side, and there is a problem that the length of the weft yarns becomes longer.

Further, regarding the detection of the weft on the side of inserting the weft, since the tip portion of the weft is not constrained and always vibrates, the detection signal is not stable, and a deviation occurs between the arrival timing and the detection timing. In many cases, it is sufficient to detect only the presence or absence of wefts, but it is difficult to accurately detect the arrival timing.

Therefore, the present invention accurately measures at least a part of the weft insertion time using a suitable detector, and based on this, a fluid that can appropriately control the fluid supplied to the weft insertion nozzle or the rotational speed of the loom main shaft. An object is to provide a control device for a jet loom.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention provides an apparatus for measuring at least a part of the weft insertion time, each time the device is rewound once from the weft storage drum during weft insertion. A rewinding detector that detects the passage of the weft and outputs a plurality of detection signals in one weft insertion; a means for preselecting one of the plurality of detection signals from the rewinding detector; It is configured to include a means for detecting a time point at which a predetermined number of detection signals selected in advance among a plurality of detection signals from the return detector are input.

<Operation> That is, by detecting the passage of the weft that is rewound around the drum during weft insertion by the rewind detector, the behavior of the weft that rotates around the drum due to rewind is stable, so a stable detection signal Based on this, at least a part of the weft insertion time can be accurately measured based on this, and the control by it can be stabilized.

<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 package holder fixed to the frame 1, 10A and 10B are weft packages held by the package holder 9, and 11 is a weft drawn from the package 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 a weft storage device 14 of drum type via a guide pulley 13.
, Wind around there, and weft at the specified timing
It is passed through a weft grasping device 15 for grasping or releasing 11 and a main nozzle 16 for weft insertion which swings integrally 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. Gear box
20 is fixed to stages 21A and 21B protruding from the frame 1, and a gear box 20 supports a hollow rotating shaft 22. 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 denotes a magnet holder fixed to the gear box 20, and a magnet (not shown) fixed to the magnet holder and a magnet 26 fixed to the back surface of the drum 24 are opposed to each other so that the drum 24 is rotated even if the rotary shaft 22 rotates. I keep it still. The drum 24 has 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 portion 24A and the storage portion 24B and a plunge hole 28 located at the storage portion 24B. The locking pins 29 and 30 are adapted to enter and exit. These locking pins 29,3
Reference numeral 0 is slidably fitted to a guide body 31 projecting from the gear box 20, and is reciprocally moved in the vertical direction in FIG. 3 by rocking bodies 32 and 33 fitted to the rectangular portions at the ends. Reference numerals 34 and 35 denote levers for manually pulling out the locking pins 29 and 30, which are fitted to the shaft 36. 37 is the main shaft of the loom (not shown) to the gear box 20
It is a transmission system that transmits power to. The weft gripper 15 is fixed to the base 38 fixed to the frame 1, and the gear box 20
Fixed shaft by cam 40 fixed to shaft 39 protruding from
The lever 42 pivotally attached to the shaft 41 is swung so that the upper clamp body 15B is brought into contact with and separated from the lower clamp body 15A by the lever 42 to grip and release the weft thread 11. 43 and 44 are weft grippers 15
It is a guide provided before and after.

In this case, the rotary shaft 22 is associated with the main shaft of the loom.
At the same time, the guide pipe 23 is rotated to wind the weft 11 around the winding portion 24A of the drum 24, and the locking pins 29, 30 are inserted into the insertion holes 27, 28.
It is put in and out at a predetermined timing. That is, when the weft insertion is completed, the locking pin 30 is pulled out from the plunge hole 28 at the end of the weft insertion, and the locking pin 29 is plunged into the plunge hole 27. After being locked by the locking pin 29, the shortest distance is taken to the guide 43 on the inlet side of the weft gripper 15. 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
The weft thread 11 wound around 24A is moved to the storage section 24B and wound around the storage section 24B a predetermined number of times, for example, four times, and then the locking pin 2
9 enters the plunge hole 27, and the weft 11 to be wound thereafter
And separate. When the weft insertion time comes, the weft gripper 15
Releases the weft yarn 11, the locking pin 30 is pulled out from the thrust hole 28, and the weft yarn 11 is weft-inserted by air injection from the main nozzle 16. At this time, the weft 1 wound around the storage section 24B
1 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
Hold 11

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

Referring to FIG. 1, 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. The air tank 46, the solenoid valve 47 that is opened by turning on the start preparation switch of the loom and closed when the loom is stopped, and the cam 48 that rotates in conjunction with the main shaft of the loom open at a predetermined time of the weaving cycle, that is, the weft insertion time. The compressed air is supplied through the mechanical valve 49. 50 is a pressure gauge. Here, the electric-pneumatic proportional valve 45 receives the digital signal from the control circuit 51 as D / A.
It is converted into an analog voltage via the converter 52 and input.

A signal from the rewind detector 53, a signal from the angle sensor 58, and a signal from the presetter 60 are input to the control circuit 51 as control inputs. 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 unwinding detector 53 detects the passage of the weft 11 unwound around the drum 24 at the time of 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, 55 are located on the main nozzle 16 side of the retaining pin 30 of the storage portion 24B of the drum 24, as shown in FIGS. 6 and 7. In addition, the unwinding direction of the weft 11 (Fig. 6B)
Direction)), the bracket 56 fixed to the gear box 20 is made to face the position immediately before the locking pins 29, 30.
(See FIGS. 3 and 4). The axis of the rewind detector 53 is orthogonal to the axis of the drum 24. The drum 24 is made of aluminum, and the surfaces of the winding portion 24B and the storage portion 24B are ceramic-sprayed to prevent the weft 11 from slipping. With respect to the portion of the drum 24 opposed to the above, the ceramic surface is removed to expose the aluminum surface, and buffing is performed to finish the mirror surface 57 (see FIG. 6).

In this way, the light emitted from the light emitting surface 54 is usually
The light is reflected by the mirror surface 57 of 24 and enters the light receiving surface 55. When the weft 11 is unwound, the weft 11 projects the light receiving and receiving surface 5.
When passing between 4,55 and mirror surface 57, the light flux is blocked and the light receiving surface
The amount of light incident on 55 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 main shaft of the loom and is made to face a rotating body 59 having 360 convex portions around it, and detects the convex portion to detect the rotation angle of the main spindle (hereinafter referred to as the main spindle angle). To do. 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 required for control by the control circuit 51, and includes a binary switch 60a capable of hexadecimal input and three decimal switches 60b.

Reference numeral 61 is a rewinding timing indicator 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 signal from the control circuit 51 is output. The light emitting diode 62 of the corresponding angle emits light. 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, based on the control input from the rewind detector 53, the angle sensor 58 and the presetter 60,
A predetermined process is performed and output to the D / A converter 52 and the display 61 to control the supply pressure to the main nozzle 16 via the electro-pneumatic proportional valve 45 and to perform a predetermined display.

Specifically, this control circuit 51 is, as shown in FIG.
Equipped with U65, ROM66, RAM67, I / O68, 69 and drivers 70, 71,
Rewind detection signal from rewind detector 53, angle sensor
The main shaft angle signal from 58, the reference angle set value T ₀ from the presetter 60, the allowable range set value LM and the initial pressure set value V are input / output to the I / O 6
Read into CPU65 via 8, write necessary data to RAM67 according to the program in ROM66, read it out, output to D / A converter 52 via I / O69, and for timing display via drivers 70, 71 It outputs to the light emitting diode 62 and the digital display section 64 for pressure display.

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 through (step S1 in the flow of FIG. 9). Here, the voltage value is set to match the pressure value.

Next, it is determined whether or not the 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. 11, those conditions are input from the presetter 60.

That is, for example, the binary switch of the presetter 60
When 60a is 0, the number of rewinding times to be selected is set, and at that time, the current number of times (1
~ 4) is displayed, 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 in the RAM 67 and stored. . In other words, when setting the number of times,
The binary switch 60a is set to 0, the decimal switch 60b is set to "004" for the fourth time, for example, 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. Therefore, the presetter
The binary switch 60a and the decimal switch 60b of 60 correspond to means for preselecting one of the plurality of detection signals from the rewind detector 53.

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

When the allowable range LM is set, the binary switch 60a may be set to A, the decimal switch 60b may be set to "100", and the write switch may be turned on. When the initial pressure V is set, the binary switch 60a is set to F, the value is set by the decimal switch 60b, and the write switch is turned on.

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, pressure control and reading of information for that are not performed until the second pick, and wait until the rotation is stabilized.

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. The spindle angle signal T from the angle sensor 57 at the time when is input is read. Therefore, this portion corresponds to a means for detecting the time point when the preselected and predetermined detection signal of the plurality of detection signals from the rewind detector 53 is input. Then, the reference value T ₀ is subtracted from the value to obtain the difference (T−T ₀ ) and the cumulative value ΣT of the difference is calculated. At the same time, the value of ΣP, which indicates the number of picks since the accumulation is started, 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).

If the allowable range on the minus side is exceeded, the current pressure V
Is divided by the number of picks ΣP until it exceeds the allowable range, and this is subtracted from the current pressure V to set a new pressure V (step S11).

The pressure V newly set in this way is output to the D / A converter 52 and also displayed on the digital display unit 64. At the same time, ΣT and ΣP are cleared (step S1
2).

As described above, 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. The supply pressure V to the main nozzle 16 is increased by an amount corresponding to the number of picks ΣP, the traction force is increased, and the weft insertion time is optimized.

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

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 S13) and the system stands by.

Here, the weft insertion time is measured and the rewinding timing used for control is detected by selecting one from a plurality of rewinding times, so that one suitable for control can be selected. That is, when the number of rewinds is small (for example, in the first round), the variation is small but the variation is small. Therefore, if the resolution is good, the variation is not affected and the responsiveness can be improved, and the number of rewinding is increased. In the case of detecting and controlling the timing, the change is large, but the variation is large, so that it cannot be judged with a few picks, and the responsiveness is deteriorated accordingly. Therefore,
The optimum type is selected in consideration of the yarn type and the like.

In this embodiment, 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 rotational speed 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.

<Effect of the Invention> As described above, according to the present invention, since the rewinding of the weft from the drum is detected, a stable detection signal can be obtained, and the weft insertion time can be accurately measured and controlled. In addition, since one of a plurality of detection signals obtained by one weft insertion is selected and used in advance, the optimum one can be selected in consideration of the yarn type and the like.

[Brief description of drawings]

FIG. 1 is a schematic view of an essential part showing an 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, and FIG.
FIG. 5 is a side view of the weft storage device, FIG. 5 is an enlarged view of the rewind detector, FIGS. 6 and 7 are front and side views showing the layout of the rewind detector, and FIG. 8 is a control circuit. A block diagram showing the hardware configuration, and FIGS. 9 to 11 are flowcharts 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

Claims (1)

[Claims] 1. A weft insertion nozzle (16) for inserting a weft (11) wound around a drum (24) a plurality of times into a warp opening by a fluid jet and having a weft insertion time of the weft (11). A device for measuring at least a part of the weft insertion time and a device for comparing the measured weft insertion time with the reference time and controlling the supply fluid to the weft insertion nozzle (16) or the rotational speed of the loom main shaft according to the difference (45,51). And a device for measuring at least a part of the weft insertion time,
An unwinding detector (53) that detects the passage of the weft (11) every time it is unwound from the drum (24) and outputs a plurality of detection signals in one weft insertion, and this unwinding detector (53). ) From a plurality of detection signals from the rewind detector (53), and a time point at which a predetermined number of detection signals selected in advance from the plurality of detection signals from the rewind detector (53) are input. A control device for a fluid-jet loom, comprising: a detecting unit.