JPH0512451B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a drum-type multicolor weft yarn measuring and storage device, and particularly to a method for controlling the start and end of weft insertion using two locking pins.

[Technical background]

In a drum-type weft yarn length measurement and storage device, the weft yarn is wound around the outer circumferential surface of the drum by the relative rotational movement of the winding arm for guiding the weft yarn and the drum for length measurement storage, and the stored weft yarn is unwound. That is, the control of the start of weft insertion and the locking of the weft thread, that is, the control of the end of weft insertion, are performed by two locking pins installed along the circumferential direction of the drum.
For example, in a "1 x 2" two-color alternating weave, one of the two weft threads is wefted twice in a continuous manner, so two weft threads are placed along the circumferential direction on the inside or outside of the drum. A locking pin is provided.

[Prior art and its technical issues]

First, we will specifically explain the configuration and operation of a conventional drum-type weft length measuring and storage device that stores the weft without transferring it, with reference to Figures 1 to 4, and clearly state the technical issues involved. do.

The weft thread 1 passes through the inside of the winding arm 2, and its rotational movement causes it to be wound one after another around the outer circumferential surface of the length measurement storage drum 3 in a stationary state. This drum 3 integrally forms a conical surface 3a and a cylindrical surface 3b with almost no taper.
Two holes 4 and 5 are formed along the circumferential direction. The two first locking pins 6 and the second locking pins 7 control the unwinding of the stored weft yarn 1, that is, the start of weft insertion, by retreating from the inside of the holes 4 and 5. Furthermore, by entering the inside of the holes 4 and 5, the locking of the weft thread 1, that is, the completion of weft insertion is controlled.

As an example, Fig. 4 shows the weaving cycle "1".
For the example of the two-color alternating weave of "x2", the forward and backward movement of the first locking pin 6 and the second locking pin 7 is shown in relation to the rotation angle of the loom, and the hatched portions are as follows:
A state in which the first locking pin or the second locking pin 7 has entered the corresponding holes 4 and 5 is shown.

Now, in the first rotation of the weaving cycle, only the first locking pin 6 enters the corresponding hole 4, so the weft yarn 1 is locked by the first locking pin 6,
It is wound around the outer peripheral surface of the drum 3. Number of turns required for weft insertion For example, 4 turns of weft 1 is the first
When the second locking pin 7 is stored by the locking pin 6, the second locking pin 7 enters the corresponding hole 5 at a rotation angle of around 310 degrees. It is then locked and sequentially wound around the conical surface 3a. In addition, in this first rotation, the weft thread of the other of the two colors is inserted.

In the subsequent second rotation, the first locking pin 6 rotates at the rotation angle.
Since it retreats from the inside of the hole 4 at nearly 90 degrees, the weft yarn 1 stored between the first locking pin 6 and the second locking pin 7 is unwound, and as a result, the weft yarn 1 at the first pick is unwound. Horizontal insertion begins. The length of the weft thread 1 at this first pick is regulated by the retreat of the first locking pin 6 and the entry of the second locking pin 7.
Based on the position of the first locking pin 6, (4 turns + L)
It is becoming. Here, L represents the distance between the first locking pin 6 and the second locking pin 7 in the circumferential direction of the drum 3.

After this, the second locking pin 7 retreats at a rotation angle of about 90 degrees during the third rotation, and weft insertion of the second pick is started. At that point, there are still four turns of weft thread 1 on the conical surface 3a on the large diameter side of the second locking pin 7.
is not completely rolled. However, wrapping arm 2
Since the weft yarn 1 continues to be wound around the circumferential surface of the drum 3 even during weft insertion, the weft yarn 1 will be wefted by the required length at the end of the second pick. Of course, at this time, the first locking pin 6
is set back and away from the circumferential surface of the drum 3, so
This will not interfere with the weft insertion of the weft thread 1 of the second pick. After that, at a rotation angle of around 185 degrees, the first
The locking pin 6 enters the inside of the hole 4 of the drum 3. At this time, the second pick weft 1 is
Since it is locked by the locking pin 6, the weft insertion of the second pick is completed. The length of the second pick is regulated by the retreat of the second locking pin 7 and the entry of the first locking pin 6.
L).

In this way, the first locking pin 6 and the second locking pin 7 alternately control the weft thread of the first pick and the second pick, so that the weft insertion length of the first pick and the second pick is (2L). ) will make a difference.
Such a length measurement error (2L) not only wastes more weft than necessary, but also causes shot pick. This is the first problem of the present invention.

By the way, when the first locking pin 6 or the second locking pin 7 locks the weft thread 1 and ends the weft insertion, the weft thread 1 is attached to the first locking pin 6 or the second locking pin 7. As shown in Figure 1, it is wrapped at a winding angle α smaller than 90 degrees. At this time, as shown in FIG. 3, the weft thread 1 receives a sliding force in the weft insertion direction along the conical surface 3a from both sides of the first locking pin 6 or the second locking pin 7. 1
It slides down along the side of the locking pin 6 or the second locking pin 7. As a result, due to fluctuations in the winding tension of the weft thread 1 and fluctuations in the coefficient of friction, the weft thread 1 ends up always being wound around the locking pin at different height positions. Therefore, when the first locking pin 6 or the second locking pin 7 comes out of the holes 4 and 5 during the next weft insertion, even though the timing is the same, the winding position of the weft thread 1 will be different. , even though the timing is the same,
Since the winding position of weft thread 1 is different, weft thread 1
The timing at which it comes off may be off, resulting in a horizontal insertion failure.

Moreover, as the speed of the loom increases, it is necessary to reduce the amount of movement of the locking pin, so it is necessary to reduce the amount of penetration of the first locking pin 6 or the second locking pin 7 into the holes 4 and 5. In some cases, the weft thread 1 may slip through the tips of these locking pins, and the weft thread 1 may come off. As a result, the weft insertion length is increased by, for example, one roll, resulting in a long pick or a short pick next time.
This also results in poor horizontal insertion. Because of this phenomenon, horizontal insertion is always in an unstable state. This is the second problem of the present invention.

[Purpose of the invention]

Therefore, the purpose of the present invention is to solve the first problem, that is, the error in the length of the weft thread, and at the same time, the second problem, that is, to stabilize the locked state of the weft thread 1 and to average the unwinding timing of the weft thread. It is.

[Means for solving the invention]

Therefore, in order to solve the first problem, the present invention uses the first locking pin 6 and the second locking pin 7 as in the conventional example, and in order to solve the first problem, the weft insertion of the first pick and the second pick is The finishing is performed only by the first locking pin 6, and the weft insertion is always controlled from the same position. Furthermore, in order to solve the second problem, the present invention provides a first
By allowing the second locking pin 7 on the downstream side of the locking pin 6 to enter the conical surface 3a side, the weft thread 1
The winding angle is shared between the first locking pin 6 and the second locking pin 7 to increase the winding angle.

〔Example〕

Hereinafter, the method of the present invention will be specifically explained based on FIGS. 5 to 10. Similarly to the conventional example, the case of "1×2" two-color alternating weave will be described as an example, and the same parts as in FIG. 1 will be described using the same reference numerals.

In the present invention, as shown in FIGS. 5 and 6, the second locking pin 7 is located on the conical surface 3a and is provided on the larger diameter side of the drum 3 than the first locking pin 6. It is being

Next, FIG. 7, like FIG. 4, shows the forward and backward movement of the first locking pin 6 and the second locking pin 7 in relation to the rotation angle of the loom. Here again, the shaded area in the drawing is the first locking pin 6 or the second locking pin 7.
represents a state in which the holes 4 and 5 have entered the corresponding holes 4 and 5.
In addition, as already mentioned, in the case of "1 x 2" two-color alternating weave, three rotations of the loom constitute one repetition, and in the first rotation, weft insertion is performed for the weft yarns of other storage devices, Subsequent 2nd and 3rd rotation
The same weft thread 1 is continuously inserted in each rotation.

In the first rotation, as shown in FIG. 8, the first locking pin 6 has entered the corresponding hole 4, and the second
At its initial stage, the locking pin 7 is located on the downstream side thereof and on the large diameter side of the conical surface 3a, and is retreated from the corresponding hole 5. In addition, in FIGS. 8 to 10, the cross sections are shown in the holes 4 and 5 for convenience of explanation. Therefore, the weft thread 1 is sequentially wound between the first locking pin 6 and the second locking pin 7 by the winding arm 2, as shown in FIG. When the number of windings corresponds to one pick, for example four, the second locking pin 7 enters the corresponding hole 5 at a rotation angle of around 310 degrees. after that,
The weft yarn 1 is locked by the second locking pin 7 and wound around the large diameter side of the drum 3. In this first rotation, as already mentioned, the weft yarn of the mating storage device is inserted.

When entering the subsequent second rotation, the first locking pin 6 begins to retreat from the rotation angle of 90 degrees, and enters again at a rotation angle of nearly 185 degrees. During this period, the first pick weft 1 stored between the first locking pin 6 and the second locking pin 7 is unwound and wefted. 1st
When the locking pin 6 enters the corresponding hole 4 at a rotation angle of approximately 185 degrees and the weft thread 1 is then wound around the first locking pin, the second locking pin 7 has already been inserted into the corresponding hole 5. Because it has entered the inside, the weft 1 is the 6th thread.
As shown in the figure, it is bent while contacting the first locking pin 6 and the second locking pin 7. At this time, the winding angle α1 of the weft thread 1 around the first locking pin 6
is larger than the winding angle α of the conventional example, and as a result, the force by which the weft yarn 1, which is locked by the first locking pin 6, tries to slide on the tapered portion 3a is also shared by the second locking pin 7. Therefore, the effects of changes in winding tension, etc. do not directly affect the first locking pin 6, and the weft thread 1 is less likely to slip down the side of the first locking pin 6, and is locked in a stable state. Ru. Furthermore, the winding angle α2 of the weft thread 1 about the second locking pin 7 is similarly increased.

In the next third rotation, both the first locking pin 6 and the second locking pin 7 move backward from around the rotation angle of 90 degrees, so that the weft insertion of the second pick is started. The weft insertion for the second pick is started, and by the time it is completed, the number of turns of the weft yarn 1 necessary for weft insertion for one pick is stored on the upstream side of the drum 3, that is, on the conical surface 3a. Since the first locking pin 6 and the second locking pin 7 retreat simultaneously in this way, the start of the weft insertion of the second pick is substantially controlled by the first locking pin 6. Here, the length of the weft thread 1 at the time of weft insertion is substantially locked by the first locking pin 6 that enters before the completion of four windings, so even when wefting the second pick, the length of the weft thread 1 is The length of the weft yarn 1 is theoretically the same as the weft insertion length of the first pick. Note that the first locking pin 6 may precede the second locking pin 7 and retreat earlier. The dotted lines in the drawings indicate this.

In addition, since both the first locking pin 6 and the second locking pin 7 enter the corresponding holes 4 and 5 at a rotation angle of approximately 185 degrees, the weft thread 1 also reaches the end of the weft insertion of the first pick. At the same time, they are locked at the winding angles α1 and α2, respectively, and are locked stably as before. The entry timing of the first locking pin 6 or the second locking pin 7 is from the time when the first roll passes the second roll locking pin 7 before the end of the weft insertion, to the time when the next one roll passes through the second roll locking pin 7.
The period can be arbitrarily set as long as it is a period up to when the winding passes the position of the first locking pin 6 or the second locking pin 7, respectively. Within this period, for example, the second locking pin 7 may enter the hole 5 a little later than the first locking pin 6, as shown by the dotted line.

When the initial locking is completed in this way, the second
The locking pin 7 is retracted before entering the first rotation of one weaving cycle, and then moves on to the first rotation of the next weaving cycle. In this case, the timing of retraction of the second locking pin 7 may be set after the weft yarn of the second pick is once locked, and may be set earlier than in the above example. As above, the loom is
Once rotated, one repetition will be completed.

By the way, these first locking pins 6 and second
The locking pin 7 can be controlled by a cam and a cam lever that synchronize with the rotation of the loom, or by controlling the drive current while synchronizing the rotation of the loom using independent electromagnetic plungers or the like. It will be done.

[Other Examples]

In the above embodiment, the first locking pin 6 is also arranged to enter the conical surface 3a of the drum 3, but this first locking pin 6 is arranged in the cylindrical portion 3b. Good too. Although the cylindrical portion 3b is less stable than the conical portion 3a, the same function can be obtained.

Furthermore, although the above embodiments have been described with reference to the case of two-color alternating weave of "1 x 2", the present invention is not limited thereto; for example, "2 x 2", "3 x
2" etc., in short, it can be applied to fabrics in which two picks are continuously wefted.

〔Effect of the invention〕

In the present invention, the first pick and the subsequent second pick
Since the start and end of weft insertion of the picked stitches is always controlled by the first locking pin on the upstream side in the winding direction, the unwinding position of the weft is always constant, and therefore length measurement errors are reduced. Also, at least at the end of weft insertion, the second locking pin on the downstream side of the first locking pin always enters the large diameter side of the conical surface of the drum, so the weft thread against the first locking pin The winding angle becomes large, and as a result, the locked weft yarn does not slide down the side surface of the first locking pin and is locked in a stable position, so the timing of weft insertion is stabilized.

Also, at least at the end of the horizontal insertion, the first
Since the locking pin and the second locking pin enter the drum, the impact applied to the weft thread during winding is dispersed to two points, which has the effect of reducing the occurrence of weft thread breakage due to impact during winding. There is also.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the arrangement of conventional locking pins;
Fig. 2 is a sectional view showing the positional relationship of conventional locking pins, Fig. 3 is an enlarged sectional view of the hole portion, Fig. 4 is a time chart of the conventional control method, and Figs. 5 and 6 are FIG. 7 is a plan view showing the arrangement of pins according to the control method of the present invention; FIG. FIG. 10 is a sectional view showing the positional relationship of pins corresponding to the first, second, and third rotations in one repeating pattern. 1... Weft, 2... Winding arm, 3... Drum for length measurement storage, 4, 5... Hole, 6... First locking pin, 7... Second locking pin.

Claims (1)

[Claims] 1 By the relative rotational movement of the winding arm for guiding the weft thread and the drum for length measurement storage, the weft thread is wound around the outer circumferential surface of the drum, and the weft thread insertion start and end are placed on the small diameter side of the drum. The weft yarn for two picks is controlled by the forward and backward movement of a first locking pin and a second locking pin located downstream of the first locking pin in the winding direction on the large diameter side of the conical surface of the drum, and continuously moves the weft yarn for two picks. In a drum-type multi-colored weft yarn measuring storage device, the start and end of weft insertion of the first pick is controlled by pressing the first locking pin while the second locking pin remains in the drum. The weft insertion of the second pick is started by moving the first locking pin and the second locking pin back from the drum surface, and the weft insertion of the second pick is completed by the first locking. 1. A method for controlling a locking pin of a drum-type multicolor weft length measuring and storage device, characterized in that the method is performed by entering the pin and the second locking pin into a drum surface.