JPH0585662B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention provides a means for measuring and storing weft yarns and for measuring and storing the length of weft yarns through the engagement and disengagement between a yarn winding surface forming body for winding weft yarns and a weft locking body. The present invention relates to a weft length measuring method in a jet room using a weft length measuring and storage device that controls withdrawal from a weft.

(Prior technology) This type of weft length measuring and storage device was developed in 1982.
In the device disclosed in Publication No. 106976, a period during which a predetermined unwinding of the winding yarn is expected to be detected is set in advance, and the detection timing of the predetermined unwinding of the winding yarn is within the set expected detection period. In this case, a weft locking body protrusion command is issued at this predicted detection time, and if the expected detection timing of the predetermined yarn unwinding is not within the set period, the weft locking body is protruded at the previous weft locking body projection command timing. I'm trying to issue instructions. As a result, even if wind floss is detected, the weft locking body protrusion command is performed after unwinding the number of yarns corresponding to the set weft insertion length, eliminating the lack of length measurement caused by wind floss detection. be done.

(Problem to be Solved by the Invention) However, since the detection period set as the predetermined unwinding prediction detection period is fixed,
Variations in the winding yarn unwinding timing subsequent to the final winding yarn unwinding due to variations in the machine rotation speed, fluctuations in the weft injection speed, or changes in the diameter of the weft cheese are related to the fixed expected detection period. In some cases, the unwinding prevention timing range specified by the above may be exceeded. Therefore, even after the final unwinding, one turn of the winding thread is unwound and inserted into the weft, and the unnecessarily long discarded selvage part gets into the warp opening and is woven into the woven fabric. This may cause fabric defects.

Structure of the Invention (Means for Solving Problems) Therefore, in the present invention, length measurement and storage of the weft yarn and removal from the yarn winding surface are achieved by the engagement and disengagement between the yarn winding surface forming body for winding the weft yarn and the weft yarn locking body. In the weft length measuring and storage device for controlling unwinding, a predetermined number of unwinding yarns is set in advance in the weft yarn measuring determination means, and detection is performed by the unwinding detecting means for detecting the unwinding yarn that is pulled out from the yarn winding surface. Send the signal to the weft length measurement and determination means,
If the number of undetected winding yarns does not match the preset number of unwinding yarns, outputting at least one of an alarm signal or a machine stop signal from the weft measurement determining means; When the cumulative number of output signals reaches a preset number of times in the weft measurement determination means, at least one of an alarm or a machine stop signal is output from the weft measurement determination means.

(Function) That is, the weft length measurement and determination means compares the detected winding yarn unwinding number with a preset winding yarn unwinding number,
When the detected number of unwinding yarns exceeds the set number of unwinding yarns, at least one of an alarm signal or a machine stop signal is output. When the number of signal outputs reaches a set number of times, a warning that the set cumulative number of times has been reached is issued, or the machine is stopped. When the number of times a signal is output to stop the machine reaches a set number of times, a warning that the set cumulative number of times has been reached is issued. If the detected number of unwinding threads does not reach the set number of unwinding threads due to the detection performance of the winding thread unwinding detection means, an alarm signal is output, and the number of times this signal is output is equal to the set cumulative number of winding threads. If the set cumulative number of times has been reached, a warning that the set cumulative number of times has been reached is issued. By issuing such an alarm or stopping the machine, it is possible to prevent the occurrence of weaving due to excessive length measurement, and furthermore, it is possible to prevent erroneous detection of insufficient length measurement due to the detection performance of the yarn unwinding detection means. It becomes possible to understand the

(Example) Hereinafter, an example embodying the present invention will be described based on the drawings.

A rotary support tube 2 is rotatably supported on a side frame 1 of the loom via a support ring 3.
A winding tube 4 is fixedly connected to the rotation support tube 2 in a communicating manner. A drum-shaped thread wrapping surface forming body 5 is supported at the tip of the rotation support tube 2 so as to be relatively rotatable, and a gear 6 fixed to the support ring 3 and the thread wrapping surface forming body 5 are fixedly attached Gear 7 and planetary gears 8 and 9
are interlockingly connected. Due to this meshing relationship, even when the rotating support tube 2 side rotates, the thread-wrapped surface forming body 5 side remains stationary without rotating.
Weft yarn Y supplied from the cheese 10 into the thread-wrapped tube 4
is wound around the thread wrapping surface 5a of the thread wrapping surface forming body 5.

The rotation support tube 2 is rotated by a motor 11 that is separate from a machine drive motor (not shown), and the operation of the motor 11 is controlled by commands from a machine control computer C.

A phototube 12 is arranged near the thread winding surface 5a, and a weft locking body 14 driven by an electromagnetic solenoid 13 is arranged in front of the phototube 12 so as to be able to intersect with and separate from the thread winding surface 5a. The phototube 12 sends a signal current corresponding to the amount of light reflected from the bobbin winding surface 5a to the machine control computer C via the signal shaping circuit 15, and the machine control computer C controls the operation of the motor 11 according to this signal. The rotation of the motor 11 is controlled so that the amount of stored yarn becomes a predetermined amount or more.

The electromagnetic solenoid 13 is configured to receive command control from the weft length measurement determination computer C1 via the drive circuit 16, and when the electromagnetic solenoid 13 is demagnetized, the weft locking body 14 intersects with the thread winding surface 5a, and the electromagnetic solenoid 13 causes the weft locking body 14 to separate from the yarn winding surface 5a. Weft locking body 1
A weft detector 17 for detecting winding yarn unwinding is installed at a position axially symmetrical with 4, and the weft yarn unwinding detection signal from the weft yarn detector 17 is passed through a signal shaping circuit 18 and an amplifier circuit 19 to a weft measuring circuit. It is taken into the length judgment computer C1. A variable resistor (not shown) is incorporated in the amplifier circuit 19, and the amplification factor in the amplifier circuit 19 can be changed by operating this variable resistor.

The weft length measurement and determination computer C1 contains the electromagnetic solenoid 13 excitation command angle The angle α for defining the range, the angle β for defining the demagnetization command angle of the electromagnetic solenoid 13, the predetermined number of unwindings n, and the number of unwindings detected for each weft insertion does not reach n. The cumulative number of unwindings m1 in case of unwinding and the cumulative number of unwindings m2 in case the number of unwindings detected for each weft insertion exceeds n are input and set in advance by the input setting device 20, and each of these setting values is input and set by the optical communication unit 21. The data is input from the input setting device 20 to the weft length measurement and determination computer C1 via the input setting device 20. The set unwinding number n is the number of windings corresponding to the weft insertion length, and is 4 in this embodiment. The reference angular position θ is corrected at any time based on the yarn unwinding detection information for each weft insertion, and the expected yarn unwinding detection angle range is adjusted based on the reference angular position that is corrected as necessary. [θ
−α, θ+α]. Then, the weft length measurement determination computer C1 calculates and grasps the machine rotation angle based on the machine rotation angle detection signal from the rotary encoder 24, and when the n-th unwinding is detected, the reference angle position θ Performs correction control.

Figure 3 a and b are the weft length measurement judgment computer C1
The control method will be explained below according to this flowchart.

As shown in FIG. 1, the electromagnetic solenoid 13 is in a demagnetized state and the weft locking body 14 intersects with the yarn winding surface 5a, thereby preventing the yarn from unwinding on the yarn winding surface 5a. When the machine rotation angle position reaches X, the weft length measurement judgment computer C1 activates the electromagnetic solenoid 1.
3, and the electromagnetic solenoid 13 is excited. As a result, the weft locking body 14 is separated from the thread winding surface 5a with a slight delay, and the yarn on the thread winding surface 5a is pulled out from the thread winding surface 5a and unwound by the jet from the weft insertion main nozzle 22. If the (n-1)th unwinding detection angle position is within the set expected detection angle range [θ-α, θ+α], the weft length measurement determination computer C1 determines the (n-1)th unwinding detection angle position. A degaussing command is issued after the machine rotation angle β has passed from the shaft detection angle position. As a result, the weft locking body 14 intersects with the thread winding surface 5a after the n-th unwinding, and unwinding of the thread is prevented. Therefore, the length of the weft Y ejected from the main weft insertion nozzle 22 is equal to n turns of the winding yarn, and a predetermined length of weft yarn is inserted.

When the detected number of yarn unwindings reaches n, the weft length measurement/judgment computer C1 corrects the reference angular position θ. This is carried out by calculating the average value of the time of horse detection. With this correction, the reference angular position θ is changed to θ' as shown in FIG. 2a, and the set expected detection angle range [θ-α, θ+α] is changed to
θ′+α].

As shown in Fig. 2b, if the (n-1)th unwinding is not detected within the set expected detection angle range [θ-α, θ+α], the weft length measurement judgment computer C1 determines the machine rotation angle. A demagnetization command is issued to the electromagnetic solenoid 13 at the position (θ+β). As shown in the figure, if the (n-1)th unwinding detection is performed before (θ-α), excessive length measurement may occur, that is, the unwinding detected during one rotation of the machine may occur. If there is a risk that the number of yarn unwindings detected during one rotation of the machine exceeds n, the weft length measurement and determination computer C1 cumulatively stores this number of unwindings, and displays a display built into the input setting device 20. A command is given via the optical communication unit 21 to display an alarm on a first alarm display section of a panel (not shown). Cumulative storage is performed from the weft pre-winding operation for starting a new weft length measurement in the weft length measurement storage device after the machine is stopped, to the next weft pre-winding operation, and during this period, the cumulative number of times is set. When the cumulative number m2 has been reached, the weft length measurement determination computer C1 instructs an alarm display on the second alarm display section of the display panel. If the cumulative number exceeds the set cumulative number m2 during this period, the weft length measurement and determination computer C1 sends a machine stop command to the machine control computer C via the optical communication unit 21.

When excessive weft length measurement occurs, the tip of the weft thread may enter the warp opening and cause weaving flaws.Furthermore, when excessive weft length measurement occurs frequently, the number of yarns stored on the winding surface 5a may become constant. It tends to decrease more than the amount, which tends to cause variations in weft length measurements. However, by appropriately selecting the set cumulative number m2, it is possible to suppress the occurrence rate of excessive weft length measurements to a certain level or less, and thereby it is possible to reduce the occurrence rate of weaving flaws and length measurement variations.

Note that the cumulative number of times stored in the weft length measurement and determination computer C1 is reset every time the weft preliminary winding operation is performed.

As shown by the solid line in Fig. 2c, when the yarn unwinding detection signal value (negative voltage) exceeds the reference voltage V, the number of detected yarn unwindings during one rotation of the machine does not reach n.
The weft length measurement determination computer C1 cumulatively stores this number of times, and also commands an alarm display on the third alarm display section of the display panel. This cumulative number is set within the set weft insertion and number of times.
When m1 is reached, an alarm is displayed on the fourth alarm display section of the display panel, and the stored cumulative number is reset. If the cumulative number of weft insertions reaches the set cumulative number m1 within the set number of weft insertions after resetting the cumulative number of weft insertions, the fourth warning will continue to be displayed, and if the cumulative number of weft insertions does not reach the set cumulative number m1, the fourth warning will be displayed. The display is canceled.

When the fourth alarm is issued, weft detection errors can be avoided by increasing the amplification factor by operating the variable resistor of the amplifier circuit 19 and amplifying the weft detection signal value as shown by the chain line in Fig. 2c. However, if the fourth alarm is not canceled even when the amplification factor reaches the maximum, check the mounting position of the weft yarn detector 17, and check the mounting position of the weft yarn detector 17 on the thread winding surface forming body 5. It is necessary to perform maintenance inspections such as cleaning of the parts and the weft yarn detector 17 itself. Note that the amplification factor can be changed either manually or automatically, and the detection sensitivity can also be changed in the same way by adjusting the reference voltage V.

The third and fourth alarms are based on the premise that the weft yarn detector 23 on the non-end side of the weaving width has detected the tip of the inserted weft yarn Y, and the weft yarn detection by the weft yarn detector 23 must be performed. The machine control computer C issues a machine stop command. Therefore, the reason why the detected number of unwinding threads does not reach the set number of unwinding threads can be identified by detecting the number of unwinding threads, and the set cumulative number of unwinding threads can be detected.
m1 serves as a guideline for setting the amplification factor according to the detection signal level that varies depending on the yarn type, that is, the detection sensitivity, and this detection sensitivity serves as a guideline for maintenance and inspection.

Of course, the present invention is not limited to the above embodiments, and for example, the first and third alarms in the above embodiments may be omitted, or the first and second alarms may be omitted and the machine may be stopped immediately. , an embodiment in which this cumulative display is performed is also possible.

Effects of the Invention As detailed above, the present invention is configured to issue an alarm or stop the machine based on information when the detected number of unwinding yarns does not match the set number of unwinding yarns, so that excessive length measurement can be avoided. This makes it possible to grasp erroneous detection on the side of under-measured length, which has the excellent effect of preventing weaving caused by excessive length measurement and setting good sensitivity for detecting yarn unwinding.

[Brief explanation of drawings]

The drawings show an embodiment embodying the present invention; FIG. 1 is a combination diagram of a weft length measuring and storage device and a block circuit, and FIGS. 2 a, b, and c show the unwinding state and the winding yarn The graphs illustrating the unwinding prevention state, FIGS. 3a and 3b, are control flowcharts. Thread winding surface forming body...5, Thread winding surface...5a, Electromagnetic solenoid...13, Weft locking body...14, Weft detector for detecting winding unwinding...17, Weft length measurement and determination computer...C1, Weft...Y .

Claims (1)

[Claims] 1. In a weft length measurement and storage device that controls the measurement and storage of the weft yarn and its withdrawal from the yarn winding surface by the engagement and disengagement between the yarn winding surface forming body that winds the weft yarn and the weft locking body, a predetermined number of unwindings is performed. is set in advance in the weft length measurement and determination means, and a detection signal from the winding release detection means for detecting the winding thread that is pulled out from the thread winding surface and released is sent to the weft length measurement and determination means, and the number of undetected threads is determined. If the number of unwindings does not match the preset number of unwindings, at least one of an alarm signal or a machine stop signal is outputted from the weft measurement determining means, and the cumulative number of output signals from the weft length determining means is determined. A weft length measuring method in a jet room, wherein at least one of an alarm or a machine stop signal is output from the weft length measuring and determining means when a preset number of times is reached.