JPS5831144A - Weft yarn slip preventing apparatus in drum type weft yarn storing apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weft slip prevention device for eliminating variations in the length of weft yarns wound around a drum and stored in a drum-type weft storage device of a loom.

As a drum type weft storage device, patent application No. 55-8649
According to No. 7, the drum is held stationary and the weft is rotated around the drum.The first and second weft threads are wound around the circumferential surface of the drum by a guide, and enter and exit holes formed on the circumferential surface at predetermined timings, respectively. It has been proposed that the second locking body continuously measures and stores the length of the weft thread while inserting the weft thread.

In this device, the weft yarn is wound around the circumferential surface of the drum while being unwound from the yarn supplying body by a guide. Varies depending on diameter. In other words, as the winding diameter of the yarn supplying body becomes smaller, the unwinding resistance gradually becomes larger.

In other words, when the weft yarn is unwound from the yarn supply source and wound around the drum by a winding wheel rotating at a constant speed, a tension corresponding to the unwinding resistance is applied to the weft yarn, and the tension tends to increase as the winding diameter of the yarn feeder decreases or decreases.

On the other hand, the frictional resistance force (resistance force against sliding in the winding direction) of weft yarns, etc. wound on a drum etc. is expressed as a function that raises the winding angle (number of windings) to a certain value. When the frictional resistance force decreases from As a result, the frictional resistance suddenly decreases, and at this point the tension tends to pull the weft back across the drum, and this tendency increases as the winding diameter of the yarn feeder decreases, resulting in The weft length becomes shorter. In other words, when the winding diameter of the yarn feeder becomes smaller and the unwinding resistance increases, the length of the weft yarn pulled back from the drum side during weft insertion becomes longer, causing periodic variations in the weft insertion length.

When we actually investigated the relationship between changes in the winding diameter of the yarn feeder and changes in the weft insertion length (measured by the remaining yarn length on the side opposite to the nozzle) using such a conventional device, we found that for any yarn, when it is fully wound, It was confirmed that the difference in the weft insertion length between the weft winding and when the weft winding was close to empty was about 20 to 30 feet.

Problems caused by such a phenomenon are as follows.

In fragment looms with tassel selvedges such as air injection looms,
Generally, the yarn end is captured by a yarn end capturing yarn on the side opposite to the nozzle of the inserted weft yarn, and tension is applied to the yarn end to improve the tightness of the selvage. In this case, in order to reliably catch the yarn ends, the length of the weft yarn to be inserted is made to be about several tens of lengths longer than the actual woven fabric. However, in recent years, cost reduction is one of the important themes in the industry, and there is a problem that the length of this remaining yarn must be kept as short as possible. Normally, for example, if the fabric is 150CrR, the remaining yarn length is 2.5
cm (approximately 1 inch) is common knowledge in the industry, and in such cases, the weft length is 20 to 30 m +
If the weft ends are uneven, a problem will occur in that the weft ends will not reach the yarn end catching yarns, which will have an adverse effect on the formation of the selvedges.

Therefore, in order to solve this problem, a patent application filed in 1983 was filed.
- In No. 122228, the drum was separated into a length measuring part and a storage part, and a resistor such as rubber was attached to the length measuring part to prevent the weft from slipping. A so-called Luci one-way system has been proposed, which prevents slippage by increasing the number of slips.

However, such conventional anti-slip measures
In both cases, slipping was prevented by increasing the frictional resistance between the weft and the circumferential surface of the drum, so due to fluctuations in the resistance behavior on the yarn feeder side and the traction force on the nozzle side,
There was a problem in that it fluctuated and could not be sufficiently effective.

The present invention has been made by focusing on such conventional problems, and the present invention prevents the weft yarn from slipping by actively gripping the weft yarn on the circumferential surface of the drum with a gripping body during weft insertion when the weft yarn tends to slip. This aims to solve the above problems.

Hereinafter, the present invention will be explained based on the drawings.

1 and 2 show an embodiment of the present invention. A rotary shaft 5 is rotatably supported by a bearing portion 3 of a bracket 2 fixed to the frame 1 of the loom via a ball bearing 4, and this rotary shaft 5 receives power from a drive source (not shown) through a pulley 6. For example, the loom rotates four times per revolution of the loom. A drum support 8 is supported at the front end of the rotating shaft 5 via a ball bearing T so as to be relatively rotatable.
A drum 9 is fixed to this support 8 with screws 10. A magnet 33 is attached to a part of the drum 9,
A magnet 35 attached to a support 34 fixed to the bracket 2 from outside the drum 9 is placed opposite to this magnet 33 to hold the drum 9 in a stationary state.

A yarn guiding hole 11 is formed in the axis of the rotating shaft 5 from the rear end side, and this yarn guiding hole 11 is connected to a yarn guide 12 provided in the yarn guiding hole 11.
A pull-out hole 13 that opens on the circumferential surface of the intermediate portion of the rotating shaft 5 through the
It communicates with A support 14 is erected on the circumferential surface of the rotating shaft 5 slightly forward of the extraction hole 13.
A winding guide 15 for winding the weft around the drum 9 is attached to the tip of the drum 4.

Here, the weft yarn 11 pulled out from the yarn supplying body 16 is
From the thread guide 12 in the thread guide hole 11 of the rotating shaft 5 to the pull-out hole 13
After the winding is passed through the guide 15, the first and second locking bodies 18a and 18b, which will be described later, are placed on the drum 9.
The weft inserting nozzle 19 in front of the drum 9 is threaded through the weft insertion nozzle 19.

The first and second locking bodies 18m and 1ab are fixed with screws 22a and 22b to one ends of sliders 21a and 21b which are slidably inserted into a guide 20 fixed to the frame 1, and their tips ( The locking portion) has first and second holes 23a and 23b that are bored approximately side by side on the circumferential surface of the drum 9.
is relative to.

Further, a gripping body 36 made of an elastic material such as rubber is provided near the first locking body 18jL to grip the weft 17 between the gripping body 36 and the peripheral surface of the driver insert 90. This gripping body 36 is the guide 2
The screw 22c is attached to the tip of a rod 3T which is secured to one end of the slider 21c which is slidably inserted into the slider 21c, and faces the circumferential surface of the drum 9.

Approximately U-shaped stoppers 24a, 24b, 24c are attached to pins 25i, 25c at the other ends of the sliders 21a, 21b, 21c.
cam levers 26m, 26b, and 26c are attached to the tips of cam levers 26m, 26b, and 26c, which are rotatably pivoted to fixed shafts 32 inside each of these stoppers 24m, 24b, and 24e, and rows 227' + 27 bt
27c is fitted. Cam lever 26m, 26
b, 26c are springs 28m, 28b, 28 respectively
A cam 31a is urged clockwise in FIG. 2 by A, and cam followers 29a, 29b, and 29c attached to their intermediate portions are fixed to a rotating shaft 30 that rotates in synchronization with the rotation of the loom.

It is in contact with 31b and 31a.

Cams 31 a + 3 l b + 31 c move cam levers 26 a, 26 b, and 26 at predetermined timings, respectively.
c by swinging the first and second locking bodies 18 a + l 8 b through the sliders 21 m, 21 b, and 21 c.
The first and second holes 23a and 23blC of the drum 9 are moved in and out at the timing shown in the figure, and the gripping body 36
are moved toward and away from the circumferential surface of the drum 9.

Next, the effect will be explained.

During operation of the loom, as the rotating shaft rotates 50 times, the winding guide 15 rotates around the drum 9 held stationary.
The weft yarn 17 is wound around the drum 9.

If the starting point is just before weft insertion, at this time the first and second
The locking bodies 18a+1ab are connected to the holes 23m and 23b of the drum 9.
The weft yarn 1γ is locked by the 20th locking body 18b, wound around the drum 9 four times, and then locked by the first locking body 18m.

Also, there is a weft 1 on the tapered surface in front of the 10th thread body tea.
7 is slightly wound, and this weft 1T is held between the circumferential surface of the drum 9 by a gripper 36 that protrudes toward the circumferential surface of the drum 9.

From this state, the second locking body 18b is inserted into the hole 23 of the drum 9.
When exiting from b, nozzle 19 starts immediately before this.
The weft yarn 1T is inserted by the air jet. Since the winding guide 15 rotates even during this weft insertion, the weft 17 continues to be wound. During this weft insertion, drum 9 and weft 1
Although the frictional resistance force between the weft yarn 1T and the weft yarn T is unstable, in the present invention, the gripping body 36 forcibly grips the weft yarn 1T, so slipping of the weft yarn 17 is prevented, and length measurement and storage can be performed accurately. Ru. In this state, the weft yarn 17 is wound in front of the gripping body 36 as shown in FIG.

Then, during beating, the weft yarn 1T is wound around twice on the tapered surface closer to the yarn supplying body 16 than the gripping body 36, but at this time, first, the second locking body 18b enters the hole 23b of the drum 90 again, and the gripping body The body 36 is separated from the circumferential surface of the drum 9 and the weft yarn I
T is released, and then the tenth member 18m exits from the hole 23m of the drum 9. As a result, the weft thread 17 that has been locked on the tenth locking body 18b is now
It becomes locked to. When the weft 17 is wound nearly four times, the first locking body 18m enters the hole 23a of the drum 9, and then the gripping body 36 protrudes toward the circumferential surface of the drum 9 and the first locking body Grasp the weft 17 that has started winding before 1ag and prepare for the next weft insertion. Immediately after this, 1■J weft insertion is performed.

If the gripping body 36 is made of an elastic material such as rubber as in this embodiment, it is possible to prevent the drum 9 from being scratched and the weft yarn 17 from being scratched due to collision between the drum 9 and the gripping body 36.

As explained above, according to the present invention, at least during weft insertion, the weft is held by the holding body that is stored for the next weft insertion, and is held between it and the peripheral surface of the drum. The male rubbing resistance between the circumferential surface of the drum and the weft yarn is reduced, and the weft yarn can be prevented from slipping in the drum due to the tensile force on the yarn supplying body side, thereby eliminating variations in the yarn length measured and stored. I can do it.

[Brief explanation of drawings]

(11) Figure 1 is a plan view of a weft storage device showing an embodiment of the present invention, Figure 2 is a side view of the same, Figure 3 is a timing chart of the same, and Figure 4 shows the weft gripping state of the same. FIG. 5... Rotating shaft 9... Drum 15... Guide for winding 16... Yarn feeder 17... Weft yarn
18a. 18 b...locking body 23 a, 23 b
- Hole 36...Gripper patent Applicant Nissan Motor Co., Ltd. Agent Patent attorney Fujio Sasashima (12) JP-A-58-31144 (5)

Claims (3)

[Claims] (1) Weft yarn (17
) is wound around and stored, and a locking body (18 m + 1
8b) The weft (11) is stored in a drum-type weft storage device which locks and releases the weft (11) from Vc to perform weft insertion, and is stored for the next weft insertion at least during weft insertion. A weft slip prevention device in a drum-type weft storage device, characterized in that a gripping body (36) is provided to grip the weft (11) between it and the peripheral surface of a drum (9). (2) In the drum type weft storage device according to claim 1, wherein the gripping body (36) is arranged near the locking body (18a) that locks the weft during weft insertion. Weft slip prevention device. (3) A weft slip prevention device in a drum-type weft storage device according to claim 1 or 2, wherein the gripping body (36) is made of an elastic material.