JPS60209053A - Loom - 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 Field of Industrial Application The present invention relates to a weft storage bobbin that remains in the outer five portions of the hole, a weft insertion mechanism that passes through the hole during weft insertion,
For example, it relates to a loom having a projectile.

In conventional looms of this type (German Patent No. gJA
No. 9.24, U.S. Patent No. 2, kt9. <
9) During weft insertion, the weft thread is inserted primarily by the tensile force of the projectile, in which case the weft thread is pulled out from the thread storage body (storage bobbin). At the end of wefting, the projectile and the thread drawn subsequently are
At the same time, it is braked by a friction brake and brought to a standstill.

When the loom is to be driven at high speeds and, in some cases, sensitive threads are to be processed,
The weft yarn has a high acceleration, especially at the beginning of weft insertion,
The disadvantage therefore arises that high thread tensions have to be submitted. On the contrary, the thread is strongly braked at the end of weaving and must therefore again be subjected to special stresses. At the beginning of wefting, the end of the thread can be torn off from the clamping of the wefting mechanism (loss of thread) under the rapidly occurring, high tensile forces, and at the end of wefting, , the thread can be crushed in the thread brake under the influence of the relatively high inertial forces that occur rapidly during braking. In both cases, the weaving operation may be disturbed.

The invention is based, inter alia, on the problem of obtaining a weaving machine which is improved in this respect.

Means for Solving the Problem In order to solve this problem, the present invention provides a system between the weft yarn storage bobbin and the weft yarn delivery point to the weft insertion mechanism.
It is characterized in that a device is provided which is supplied with compressed air to influence the movement of the weft thread during wefting.

This makes it possible, for example, to influence, during wefting, that the weft thread experiences an extra smooth additional acceleration at the beginning of wefting. Strong thread stresses, which occur at the beginning of wefting, are therefore avoided or reduced.

At the end of wefting, the thread can be slowed down in a particularly smooth manner. For this purpose, the device for influencing the movement of the weft thread merely needs to be correspondingly supplied with compressed air and controlled. Also in this case, the stress in the yarn is reduced.

Therefore, 3m and more of sensitive weft.

Even for larger weave widths, e.g. 1l100r
It becomes possible to perform machining at a high rotational speed of p. In that case, the weft threads are not damaged. This is because, during acceleration (at the beginning of weft insertion), the total mass of the thread no longer
This is because it ensures that it is no longer moved solely by the wefting mechanism and, conversely, that at the end of wefting it no longer has to be decelerated solely by the thread brake. In both cases, the motion (acceleration or deceleration) is
It can be assisted by an additional compressed air device between the storage bobbin and the thread transfer point.

It is believed that other features of the invention will become apparent from the detailed description of the invention that follows.

EXAMPLE In the loom according to the invention, the weft thread l is fixed,
It is withdrawn from the storage bobbing which remains outside the hole J formed by the warp threads. The weft thread is, first of all,
The spray reaches a drum reservoir 5 and then via a feed device 6 consisting of - continuously rotating rollers, from where it reaches a reservoir 7 . This reservoir 7 includes a tube t standing transversely to the weaving direction S and an air nozzle // for blowing the yarn l into this tube 9. A yarn loop /J is thereby created by blowing.

Subsequently, the weft yarn l is sprayed by a deceleration nozzle (brake nozzle) /3 which sprays the weft yarn in the opposite direction to the weft insertion direction t, an acceleration nozzle l da which sprays the weft yarn in the weft insertion direction t, and the yarn tightening is performed by a device 13 in the direction of the arrow 16. The weft thread I is guided by the nozzle /S through the thread tensioner l and the thread delivery nozzle 7g, which can be moved in the opposite direction, and by means of the nozzle /S the weft thread l is presented by its end /1 to the thread crambu of the projectile. Projectile-one is the striking lever a3
It is inserted horizontally into the hole 3 (weaving width W) through. The resulting fabric in the osa-uchikoda is shown at 1.2j, and the projectile brake on the capture side 1/
It is shown in

When the weft thread 1 is to be wefted into the thread 3, the projectile body, which is in the thread delivery position shown in FIG. 1, must be located at the projection point. A short pulse of air is now applied from yarn delivery nozzle 1g by the loom control.

Therefore, the end of the thread/? is sprayed into the open projectile-1 clamp, 2/. The yarn delivery point is indicated by the symbol -◯.

Subsequently, the thread clamp 2/ is closed and the air pulse in nozzle 7g is interrupted. Thereafter, the striking lever λ3 is turned clockwise in FIG. 1, and the projectile here is projected into the hit path 3.

At the same time, an air pulse is applied into the accelerating nozzle /lI and the thread tensioner 17 moves to position /7a. The projectile-1 flies through the path 3, and the weft thread l passes through the nozzle/lI under acceleration.
, and in this case more or less of the thread loop saw in the reservoir 7 is brought out. A reservoir if you need it! The thread is pulled from.

Toward the end of the weft of the weft thread/, therefore, when the projectile-1 reaches the catching side of the loom and is braked by the brake q-λ, the air pulse in the nozzle/F It is interrupted and a pulse is applied through nozzle /3 in a direction opposite to the weft direction t. The weft thread is therefore braked.

The thread brake 15 is then closed, so that the thread l comes to a complete standstill.

Subsequently, the projectile 2a is returned to the defined thread-relaxation position, which position is completely the same for each weft insertion. During the return movement of the projectile 2-, the thread tensioner /7 moves to position /? a to the starting position 17, the weft thread l is therefore held under tension in the thread 3. The thread is cut by the shark on the injection side. Thereafter, the inserted weft yarn is beaten with a reshaping core in the fabric section 3.

In the embodiment shown in FIG. 2, instead of the acceleration nozzle/hiro and deceleration nozzle 13, a thread guide tube 31 is arranged, which is only shown schematically. By supplying pressurized air into the branch tubes 3, the yarn can be accelerated, and by supplying pressurized air into the branch tubes 33, the yarn can be decelerated. .

Moreover, in the variant shown in Figure 1, the drum storage S
Between the spray and the reservoir 7, a controllable thread clamp 74I is installed. This thread clamp 3 can, for example, be closed during wefting, so that the spray can remove the length of weft thread l to be wefted from the reservoir or loop/J. .

After finishing the weft insertion, clamp JII is opened and clamp 13 is closed. The nozzle // now contains an air pulse, so a new loop saw is formed in the reservoir.

In the embodiment according to FIG. 3, member 3.

During 31, the spray is applied to the reservoir 7. The member corresponding to /l is not installed, and similarly the member /j by the thread clamp corresponding to Figure 1 is part J/.

It is omitted during the first part.

Other variants are provided, for example in FIG. 1, in which the separate accelerating nozzle /4I is omitted and its function is taken over by the delivery nozzle /1. In this case, nozzle /1 contains another air pulse for the delivery of the thread and another air pulse during weft insertion into the weft thread J.

Furthermore, the device according to FIG. 1 is controlled in such a way that, for example, by the nozzle /J, the piece of thread which is set free during the movement of the thread tensioner 17 to the position /71L is blown back into the loop /J. It can also be done. Also, for example, a drum storage! can also be omitted and only the spray reservoir and // provided. All different combinations of the influence part of the yarn controlled by compressed air in the area between the preparatory bobbing and the yarn transfer point -0 are possible.

Movement of the weft threads of the above-mentioned or similar type also includes:
For example, it can also be used in a band grip loom, in which a freely flying projectile, two
Instead of -, a grip attached to the carrying band is adapted to be moved through the hitch J.

When a device supplied with compressed air for influencing the movement of the weft thread during wefting is to be used for - or more injection machines, the component holder shown in FIG. ,A;,3/,/7. / A large number approximately corresponding to t is
7 installed in accordance with Figure 3 for each prefecture type.
Several such arrangements are installed. At that time, the types of threads to be wefted into the path J by the multi-projection device are determined by the projector at the thread delivery point -〇;
Can be presented to 2 people.

Effects of the Invention Since the present invention has the above-described structure and operation, it is possible to provide a loom having a weft insertion mechanism for inserting particularly sensitive weft yarns. be.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing essential parts of a projectile type loom according to the present invention, and FIGS. C and 3 are schematic diagrams showing modified embodiments of the present invention. l...Weft thread; 3...Hidou; Da...Weft thread storage bobbin;
39... Thread storage device; 1.2... Weft thread loop; l... Weft insertion direction; tJ, /q... Air nozzle; l... Thread tensioner; lt... Yarn delivery nozzle; Ko O ... Weft thread delivery point; Here... Weft insertion mechanism; 3/... Tubular element.

Claims (1)

[Claims] l A weft yarn storage bobbin (ri) that remains outside the feeder (3) and a weft insertion mechanism that passes through the feeder (3) during weft insertion, such as a projectile C1; , l), between the weft yarn storage bobbin (da) and the point (-〇) where the weft yarn (1) is delivered to the weft insertion mechanism (here), there is a A loom, characterized in that it is provided with a device supplied with pressurized air for influencing the weft movement. The device to be supplied with pressurized air comprises a tubular element (3/) connected to a source of pressurized air, this element (31
2. A loom according to claim 1, wherein the weft thread (1) is guided by a weft thread (1). a A tubular element (at) is connected to a controlled pressurized air nozzle (ha0) through which air is blown in the wefting direction (t), through which the weft yarn (1) is inserted during wefting. A loom according to claim 1 or 2, wherein the false tubular element (J/) is operated by a controlled pressure air nozzle which blows air in a direction opposite to the wefting direction (1>). (
is), and the weft yarn (1
) is braked during wefting. F. A patent in which a controlled yarn delivery nozzle (/l) for delivering the weft yarn (1) is arranged at the delivery point (-〇) of the weft yarn (1) to the weft insertion mechanism (-1) A loom according to claim 7 or -. M Weft yarn storage bobbin (ri) and weft yarn delivery point (2)
Q) at least 7 weft yarn stores Cke9 between
) is arranged in claim #I/~! A loom according to any of paragraphs. 2. Weaving machine according to claim 6, wherein the weft yarn storage is a mechanical drum storage (s). g The weft yarn store is supplied with pressurized air. A loom according to claim 6 or 7, characterized in that the weft (1) is a reservoir (7) that blows out the weft yarn (1) as a weft yarn loop (/a) extending transversely to the weft insertion direction. Weft yarn storage bobbin (4t) and yarn delivery point (λθ
) is provided with a thread tensioner (/) having an arm that can freely pivot in the lateral direction with respect to the weft insertion direction CI>. The loom described in.