JPH0512452B2 - - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a weft yarn accumulating device, and particularly to a weft yarn storage device that divides the weft yarn wound around a drum by an electric weft yarn winding arm into one pick portion using a plurality of locking pins. The invention relates to a device for controlling the winding amount of weft yarn in the process of storing the weft yarn in the same state and unwinding the divided one pick of weft yarn at the time of weft insertion.

Conventional technology As a multi-color weft yarn length measuring and storage device, several picks of weft yarn are pre-wound on a drum without being separated, and the weft yarn unwound from the drum is detected during wefting, and the weft yarn is divided into one pick worth of weft yarn. It is known that a locking pin is inserted when the corresponding number of turns of weft yarn is unwound. However, the weft insertion length depends on the weft detection ability and tends to be unreliable. Phototubes and mechanical switches are used to detect the amount of pre-winding, that is, the amount of storage, but when the thread is changed or the winding tension changes, it is necessary to adjust it accordingly. Rather, the system had its limits due to the influence of wind cotton and other factors.

Purpose of the invention Therefore, the purpose of the present application is to
To provide a control device for accurately maintaining a specified amount of storage in a weft yarn storage device, which has the feature of unwinding weft yarn divided into picks and can also be used for free exchange of multiple colors. .

Summary of the Invention The present invention focuses on the fact that in the target weft yarn storage device, one pick of weft yarn is always unwound at the time of weft insertion, and the present invention directly measures the number of turns of weft yarn unwound from the drum. The feature is that it is detected based on the number of horizontal insertions, rather than the number of horizontal insertions.

Specifically, the number of weft threads stored on the outer circumferential surface of the drum is calculated by additively comparing the number of weft threads stored, which is proportional to the number of rotations of the winding arm, and the number of weft threads. When the number of storage picks is reached, the drive motor for driving the winding arm is stopped, and when the minimum number of storage picks is reached, the drive motor is automatically started. Since such counting and control functions can be configured by an electric circuit, it can be easily handled even when changing the horizontal insertion pattern.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings.

First, FIG. 1 shows a weft yarn storage device 1 of the present invention. This weft yarn storage device 1 includes, as main parts, a plurality of storage units 2 corresponding to the number of colors and a control device 3 for free exchange of the colors.

The storage unit 2 described above includes a winding arm 4, a drum 5 for measuring and storing lengths, and, for example, four locking pins 6a, 6b, 6c, and 6d. The winding arm 4 rotates on the axis of the drum 5, pulls out the weft yarn 8 from the yarn feeder 7, and winds it around the outer peripheral surface of the drum 5 one after another. This wrapping arm 4
The rotational force is provided by a driving motor 10.

And the locking pins 6a, 6b, 6c, 6d
As shown in FIGS. 2 and 3, the drum 5
They are arranged diametrically on the tapered surface 51 of the circumference at positions dividing the circumference into four, and are driven to move forward and backward by plungers 9a, 9b, 9c, and 9d, respectively. When the stored weft yarn 8 is unwound, the weft yarn 8 is transferred to the weft insertion nozzle 1.
1, the weft is placed in the middle of the warp.

Further, the control device 3 is for generating a weft-input command signal S1 to each storage unit 2 based on a program input in advance in accordance with actual weaving conditions, and is used to set the weft-input pattern. In addition to being connected to the machine 12 and the weft timing generator 13, it is also connected to a start switch 14, an arrangement switch 15, and a release switch 16. The weft-setting pattern setting device 12 is for setting a predetermined weft-setting pattern, and the weft-setting timing generator 13 is for setting a predetermined weft-setting pattern, and the weft-setting timing generator 13 is configured to set a weft-setting rotation angle for one rotation of the loom in synchronization with the rotation of the loom. A timing signal S2 is generated each time and sent to the control device 3. In addition,
The start switch 14 is for starting the control device 3, and the arrangement switch 15 is for starting preliminary winding.
Further, the release switch 16 releases the locking pin 6 of each storage unit 2 regardless of the weft insertion pattern set by the weft insertion pattern setting device 12.
This is for selectively operating a, 6b, 6c, and 6d. Note that the horizontal insertion command signal S1 is sequentially passed through the circuit 17 to each of the locking pins 6a, 6b, 6c,
6d. In the drawings, A, B, C, and D indicate corresponding connection relationships.

The weft yarn storage device 1 of the present invention includes a preliminary winding control device 18 as a characteristic part. This preliminary winding control device 18 is provided for each storage unit 2, and includes an up/down type counter 19, comparators 20, 2
1, a drive control circuit 22, a detector 23, and a storage counter 24.

The counter 19 is connected to a detector 23 by a reservoir counter 24 at its up input.
This detector 23 is an encoder or a proximity switch, and is connected to the winding arm 4 or the motor 10, and detects the amount of rotation thereof. The storage counter 24 generates one pulse each time its rotation amount reaches the rotation amount of one pick. Further, the down input terminal of the counter 19 receives the output terminal of the control device 3, that is, the horizontal insertion command signal S1.
This wefting command signal S1 is generated in a pulsed manner once per revolution of the loom when each storage unit is selected. Due to the above action, the counter 19 counts up by 1 when the amount of weft yarn 8 required for one weft insertion is stored.
When one horizontal insertion is performed, count down by 1. In other words, the counter 19 always indicates the amount of winding of the weft thread 8, that is, the number of picks P in the stored state. Note that the counter 19 is set to the control device 3 when the preparation button is pressed prior to the start of operation.
The number is reset to a preset number by a reset signal S5 generated from the. The output terminal of this counter 19 is connected to each comparator 2.
It is connected to the input terminals 0 and 21. One comparator 20 inputs the count value of the counter 19, compares it with a preset maximum storage pick number P3, and when the count value becomes larger than the maximum storage pick number P3, a stop command signal is sent. S
Generates 3. In addition, the other comparator 21
compares the count value of the counter 19 with a preset range of minimum storage pick numbers P1 and P2, and when the count value falls within the range, generates a start command signal S4. The drive control circuit 22
controls on/off of the starting motor 10 using the stop command signal S3 or the start command signal S4 as an input condition.

Function of the Embodiment Next, the function of the weft yarn storage device 1 will be explained with reference to FIGS. 2 to 5.

When the drive motor 10 is rotating, the winding arm 4 winds the weft thread 8 around the tapered surface of the drum 5 in sequence. Now, as shown in FIGS. 2 and 3, if only the locking pin 6a is inserted into the hole in the peripheral surface of the drum 5, the weft thread 8 is
It is locked by this locking pin 6a, and is sequentially wound around the larger diameter side of the tapered surface 51. During this winding process, the weft thread 8 is attached to the tapered surface 51 of the drum 5.
As seen in the exploded views of FIGS. 2, 3, and 4, the tapered surface 51 is in contact only near the locking pin 6a, and the other locking pins 6b, 6c, The portion 6d is not in contact with the tapered surface 51 and is wrapped around the cylindrical surface 52. Therefore, all other locking pins 6
b, 6c, and 6d are located on the larger diameter side of the tapered surface 51 than the weft thread 8 that is locked by the locking pin 6a. Note that in the drawings, ● indicates the locking pin's protruding state, and ○ indicates the locking pin's retracted state.

When the first locking pin 6a wraps one pick, for example, 3.75 turns, the locking pin 6b then plunges into the tapered surface 51 of the drum 5, for example. Since the winding arm 4 is continuously rotating at this time, the weft yarn 8 is newly locked by this locking pin 6b, and is sequentially wound around the large diameter side of this locking pin 6b. go. Multiple locking pins 6
Since a, 6b, 6c, and 6d divide the circumference of the drum 5 into four, the number of turns per pick can be set in 1/4 increments. Regarding the other locking pins 6c and 6d, one pick of weft thread 8 is similarly locked in sequence as shown in FIG. 42. In this way, the initial preliminary winding or preparatory work is completed. As a result, 8 weft threads for 4 picks are all stored in storage unit 2.
will be stored. During this time, counter 1
9 counts the number corresponding to the number of 4 picks from the rotation of the winding arm 4.

On the other hand, the weft insertion pattern is set in advance by the weft insertion pattern setting device 12 and input to the control device 3. Therefore, when the loom is in operation, this control device 3 inputs the timing signal S2 from the weft-insertion timing generator 13 and controls the weft-insertion into a plurality of storage units 2 based on the set weft-insertion pattern. A command signal S1 is sequentially generated to operate a plurality of storage units 2 in a predetermined order.

Now, Fig. 5 shows the relationship between the storage amount, that is, the number of picks P (the number of turns T), as well as the situation of weft insertion due to free exchange of multiple colors on the axis of time t. The operating status of the motor 10 is shown together with the rotation speed N. In the figure, horizontal insertion is indicated by a triangular hatch.

In this example, in the beginning of one repetition of the weft insertion pattern, five weft insertions are performed consecutively, then two weft insertions are performed every other rotation, and then two weft insertions are performed in the latter half. is performed continuously, and after two revolutions, three times of weft insertion are performed continuously. This weft pattern is repeated every 19 revolutions of the loom. Of course, these horizontal insertions are performed in the order of locking pin 6a → locking pin 6b → locking pin 6c → locking pin 6d. These locking pins 6a, 6b, 6c, and 6d retreat during weft insertion to unwind the stored weft yarn 8, but immediately plunge into the circumferential surface of the drum 5 when this unwinding is completed. For example, in the state shown in FIG.
When a moves back, the weft yarn that was locked by it is unwound, but at that time, the other locking pin 6
b, 6c, and 6d, and the weft thread 8 on the larger diameter side is connected to the tapered surface 51 as shown in FIG.
Therefore, the locking pin 6a after unwinding is located on the larger diameter side of the tapered surface 51 than all the stored weft yarns 8. Therefore, after this plunge, a new weft thread 8 is attached to the locking pin 6a.
becomes wrapped.

When the weft thread is continuously inserted by the locking pins 6a and 6b, the amount of stored weft thread 8 decreases from four picks to two picks, as shown in FIG.
Therefore, even after this, if the winding arm 4 remains stopped, the amount of stored weft yarn 8 will decrease to one pick or less.

Therefore, the preliminary winding control device 18 performs appropriate control. That is, each time the weft insertion is performed, the weft insertion command signal S1 is applied to the down input terminal of the counter 19, so that the count value of the counter 19 decreases each time the weft insertion is performed. The counted value is then sent to comparators 20 and 21. Therefore, the comparator 21 uses the counter 19
It is determined whether the count value is within a range smaller than 2 picks, that is, within the range of the minimum storage pick numbers P1 and P2, and when it is within that range, a start command signal S4 of "H" level is generated and this is activated. The signal is sent to the drive control circuit 22. Therefore, the drive control circuit 22 immediately starts the motor 10 and rotates the winding arm 4 so that the weft thread 8 can be applied to the circumferential surface of the drum 5.
Preliminarily wrap it.

Even after that, the locking pin 6c → the locking pin 6d
→Depending on the order of the locking pins 6a, the weft insertion is performed three times in succession, so the amount of winding increases in a sawtooth wave pattern. When wefting is performed five times in succession, the storage unit 2 does not perform wefting in the next rotation, so the amount of winding reaches the maximum storage pick number P3, for example, about 3 picks. Since this maximum storage pick number P3 has been input into the comparator 20 in advance, the comparator 20 determines the match and immediately outputs "H".
A level stop command signal S3 is generated and sent to the drive control circuit 22 to stop the rotating motor 10. In this way, an appropriate amount of weft yarn 8 is always preliminarily stored on the circumferential surface of the drum 5.

Note that even after the drive control circuit 22 stops the motor 10, the motor 10 continues to rotate due to inertia, so the amount of winding temporarily exceeds its upper limit.

In this manner, the drive motor 10 rotates intermittently to wind the required number of weft threads 8 around the circumferential surface of the drum 5. Such a series of operations is not directly related to the weft insertion pattern and always follows the pattern, so no special adjustment operation is required even when the weft insertion pattern is changed.

In addition, Fig. 6 shows the same horizontal insert pattern.
It shows a change in the amount of weft yarn when a motor 10 having a gradual rise characteristic is used. Corresponding to the slow start-up speed of the motor 10, the storage amount temporarily decreases, but problems such as shot pick do not occur.

Modifications of the Invention In the above embodiment, for convenience of explanation, the preliminary winding control device 18 is provided independently for each storage unit 2, but these preliminary winding control devices 18 are provided in common for a plurality of storage units 2. It may be. Such a common preliminary winding control device 18 is equipped with a multiplexer, and switches communication channels for a plurality of storage units 2 at high speed, and performs necessary processing in a time-sharing manner. Further, the functions of the preliminary winding control device 18, that is, the counting function, the comparison function, and the drive control function, can also be realized including the control device 3 in the field of software using a CPU or the like.

In addition, as an example, a multi-colored weft yarn storage device in which four locking pins are arranged equally on the circumference of the drum taper part is shown, but the storage amount is not limited to this. may be a weft yarn storage device in which two locking pins are equally divided,
Needless to say, it can also be used for one color.

Effects of the Invention In the present invention, since the storage amount is calculated based on the weft wrapping amount and the number of weft insertions, which can be reliably detected, the rotation of the motor for driving the winding arm is turned on based on the storage amount.・Even with off control, the storage amount can be accurately kept within the specified amount. Furthermore, since it does not utilize conventional optical detection means, it is not affected by changes in the environment and can be expected to operate stably over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the weft yarn storage device of the present invention, FIG. 2 is an enlarged side view of the drum portion of the storage unit, and FIG. 3 is a front view showing the arrangement of the locking pins.
Figure 4 is a developed view showing the relationship between the movement of the locking pin and the stored weft thread, and Figures 5 and 6 show the relationship between the preliminary winding amount and motor on/off control in relation to the weft insertion pattern. It is a time chart. 1... Weft yarn storage device, 2... Storage unit,
3...Control device, 4...Wrap arm, 5...Drum, 51...Tapered surface, 52...Cylindrical surface, 6
a, 6b, 6c, 6d... Locking pin, 7... Yarn feeder, 8... Weft thread, 9a, 9b, 9c, 9d...
Plunger, 10... Drive motor, 11...
Nozzle for horizontal insertion, 12... Horizontal insertion pattern setting device, 13... Horizontal insertion timing generator, 1
4...Start switch, 15...Arrangement switch, 16...Release switch, 17...Sequential circuit, 18...Preliminary winding control device, 19...Counter, 20, 21...Comparator, 22...Drive control circuit , 23...detector, 24...storage counter.

Claims (1)

[Claims] 1 A plurality of locking pins are arranged at equal intervals on the circumference of the drum taper part, and the locking pins are sequentially connected to the weft thread wound around the drum circumferential surface by a winding arm driven by a motor independent of the main shaft of the loom. In a weft yarn storage device, the weft yarn is stored at a stop position and divided into the number of turns for one pick, and the divided weft yarn is released by sequentially positioning the locking pin at a release position each time the weft is inserted. A detector that detects the amount of winding, a counter that uses the amount of winding of the weft thread as an addend and the number of weft insertions as a subtraction value, and uses the counted value of this counter as input to calculate the maximum number of stored picks and the minimum number of stored picks. 1. A weft storage device comprising: a comparator that compares and generates a command signal; and a drive control circuit that controls on/off of the drive motor in accordance with the command signal of the comparator.