JPH0643188Y2 - Weft tensioning device for loom - Google Patents

Description

[Detailed description of the device] Industrial field of application This device corresponds to the type and characteristics of the weft thread to be inserted.
The present invention relates to a weft tensioning device for a loom, which can switch the jetting direction of a nozzle for weft tensioning.

2. Description of the Related Art In a conventional loom, when the weft yarn is beaten before the weaving, there are cases where it is necessary to actively maintain tension with respect to the weft yarn immediately after weft insertion, and there is a case where it is not necessary.

This is mainly determined by the type and characteristics of the weft. For example, in the case of a highly elastic yarn such as a nylon filament yarn, in order to prevent the fabric defect due to the looseness of the weft, the weft put in the weft must maintain its tension until it is beaten. Contrary to this, for example, in the case of spun yarn, generally, it is not necessary to take such consideration, and excessive tension force causes the weft yarn to be cut in the middle,
This causes a so-called accidental cut-out.

Therefore, when wefts are mixed with weft yarns of different counts, such as multicolor weaving, in order to realize smooth weaving, it is necessary to maintain tension depending on the type and characteristics of the weft yarns to be wefted. It is important to make a distinction and execute this switching accurately.

By the way, in the case of an air jet loom, in order to apply a tension force to the weft thread immediately after weft insertion and hold this, the tip of the weft thread is bent by an air flow on the opposite weft insertion side of the woven fabric, There is known a weft tensioning device for keeping a tension state.

This is a reed R at the end of the flight path of the weft Y.
A front side and a rear side to form a slit R ₁ that communicates (Figure 4), through the slit R _1, before and after surface side of the reed R of,
The nozzle N ₁ and the capture pipe P are respectively arranged, and another nozzle N ₂ is arranged on the downstream side thereof. Further, a weft feeler WF ₁ for detecting the weft Y that has been normally inserted, and a weft Y when a run-out accident occurs on the upstream side of the nozzle N _{1 and} the downstream side of the nozzle N ₂ , respectively. A weft feeler WF ₂ for detecting the torn tip portion Yb is provided. The jetting direction of the nozzle N ₁ is such that the tip portion Ya of the weft yarn Y that has been normally inserted can be blown into the catching pipe P to bend the weft yarn Y (the direction of arrow K in the figure). ) Is almost perpendicular to the
N ₂ has a predetermined angle direction (hereinafter, referred to as “parallel direction” to the weft inserting direction) so that the tip portion Yb of the weft yarn Y that has been cut off can be reliably conveyed to the position of the weft feeler WF ₂ . The direction of travel).

When the weft Y that has been wefted needs to maintain tension, the nozzle N ₁ is operated to move the tip portion Ya of the weft Y,
If the weft Y is bent toward the catching pipe P through the slit R ₁ , the weft Y is locked to the front end edge of the reed wing R ₂ immediately upstream of the slit R ₁ , so that the reed is well hit, You can keep that tension. On the other hand, for the weft yarn Y that does not require tension maintenance, the nozzle N ₂ can be operated to ensure the transport of the tip end portion Yb in the event of a body breakage accident.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention Therefore, in the case of such a conventional technique, two nozzles that are switched and operated depending on the type and characteristics of the weft yarn to be inserted are provided independently. The weight is too large, and it tends to be difficult to attach the weft to the trailing end of the weft flight route in terms of space. That is, since these nozzles reciprocate at high speed with the reed, they require a sturdy mounting member,
Therefore, when the mounting member is divided into a plurality of parts, the weight and size of the mounting member become a big limitation.

Therefore, the object of the present invention is to use a single nozzle in view of the circumstances of the prior art, and to make it possible to select the jetting direction between the capturing pipe side and the weft traveling direction side. It is an object of the present invention to provide a novel weft tensioning device for a loom that can remarkably reduce space constraints.

Means for Solving the ProblemsThe structure of the present invention for achieving such an object is a catch pipe that opens from the rear surface side of a reed with respect to a slit that communicates the front and rear of the reed at the terminal end of the weft flying path, The gist of the nozzle is to face the catching pipe and to be arranged on the front surface side of the reed, and the jetting direction of the nozzle can be selected between the catching pipe side and the weft traveling direction side.

Further, the nozzle may have a motor for switching the ejection direction, and may further have a plurality of nozzle holes corresponding to the ejection direction.

With this structure, since the nozzle and the capture pipe are opposed to each other through the slit that communicates the front and rear of the reed, the tip of the weft that has flown along the weft flight path is On the other hand, if the nozzle is operated so that the jetting direction is toward the trapping pipe side, the tip end of the weft yarn is bent at a substantially right angle by the air jetting, passes through the slit, and is further guided into the trapping pipe. At this time, the weft is pulled in the direction of the tip by the air flow due to the jetting and is bent so as to come into contact with the front end edge of the reed wing at the slit entrance, so that the necessary tension state is maintained until the beating. can do. For weft yarns that do not require tension maintenance, the jet direction of the nozzle should be directed toward the weft yarn advancing direction. At this time, the nozzle should smoothly move the torn end of the broken weft yarn to the downstream side. Transport can be guided.

Further, if the nozzle has a motor for switching the ejection direction, this motor reversely drives the nozzle,
The injection direction can be switched using one nozzle.

Furthermore, if the nozzle has a plurality of nozzle holes corresponding to the injection direction, for example, a three-way valve for switching the air flow path is installed between the nozzle and the pressure air source, and this is operated. By supplying the air for jetting only to the nozzle holes oriented in a predetermined direction, the jetting direction can be easily selected.

It operates as described above.

Example Hereinafter, an example will be described with reference to the drawings.

The weft tensioning device of the loom is a slit that connects the front and back of the reed R.
It is composed of a nozzle 11 and a trapping pipe 20 which are respectively arranged before and after the reed R with respect to R ₁ (FIG. 1).

The reed R is composed of a large number of reeds R ₂ , R ₂ ... And beaded R ₃ and R _{4 at} the upper and lower ends of the reeds R ₂ , R ₂ ... . A mounting groove S ₁ is formed on the upper surface of the sley S. The rim R ₄ is brought into contact with the side wall in front of the mounting groove S ₁ , and the wedge block R ₅ is fastened to the sley S via the bolt 22b. As a result, the entire reed R is firmly fixed to the sley S.
The sley S is connected to a loom main body (not shown), and reciprocates at high speed together with the reed R for beating.

The slit R ₁ is on the side of the reed R on the reverse weft insertion, that is, the reed R ₂
Weft flying path R ₆ formed near the center of the front of R ₂ ...
The front end side and the rear face side of the reed R are formed to communicate with each other at the terminal end portion of the. The slit R ₁ is formed by inserting the insertion pins 23, 23 of the capturing pipe 20 between the _two reed blades R ₂ , R ₂ or by removing a part of the reed blades R ₂ , R ₂ ... , Reed wing spacing is wider than the regular reed wing spacing. The weft Y is inserted by a weft inserting device (not shown) and flies in the direction of arrow K in the weft flying path R ₆ .

The capture pipe 20 is arranged on the rear surface side of the reed R so as to open to the slit R ₁ . That is, the capture pipe 20
Is composed of a bent pipe 21, a bracket 22, and insertion pins 23, 23. One end of the bent pipe 21 is fixed to the bracket 22 and is directed toward the slit R ₁ through a through hole 22a formed in the bracket 22. It is open. Bracket 22 is bolt 22
It is fixed to the upper surface of the wedge block R ₅ by b and supports the bent pipe 21 behind the slit R ₁ . The insertion pins 23, 23 are sandwiched through the through hole 22a, and are erected on the upper side and the lower side thereof, with the weft flying route R ₆ being vertically sandwiched,
Reed is inserted between R ₂ and R ₂ . The insertion pins 23, 23 position the catching pipe 20 in the left-right direction and divide the slit R ₁ into upper and lower parts to reliably guide the weft Y blown into the slit R ₁ to the catching pipe 20. It forms a passage.

Nozzle 11, the nozzle hole 11a of the tip, so as to face the catching pipe 20 through the slit R _1, are disposed on the front side of the reed R. However, it is assumed that the nozzle 11 can be driven by the motor 12 so that the nozzle hole 11a can be reversed between the catching pipe 20 side and the weft Y traveling direction (arrow K _{1 in} FIG. ₁ ). Control is performed by a yarn type selection signal from a weft yarn selection device (not shown). The nozzle 11 and the motor 12 are fixed to the sley S via the holder 13. That is, the holder 13 is a T groove of the sley S.
A T-slot bolt 13a which is inserted into the S _2, via the nut 13b,
It is attached to the sley S.

Here, in the case of weaving using two types of weft yarns Y ₁ and Y ₂ having different yarn types, the nozzle 11 acts as follows (second
Figure). However, the weft Y ₁ is a highly elastic yarn such as a nylon filament yarn, and it is necessary to apply a tension force immediately after weft insertion to maintain the tension, while the weft Y ₂ is a span yarn. It is not necessary to maintain tension like a thread.

Also. Along the weft flying path R ₆ , on the upstream side of the nozzle 11, a weft feeler WF ₁ for detecting the tips of the normally inserted wefts Y ₁ and Y ₂ is arranged, and on the downstream side of the nozzle 11. Is equipped with a weft feeler WF ₂₁ for detecting the torn end Y _2b of the weft Y ₂ when a cutout occurs, and another weft feeler WF ₂₁ is provided near the end of the catch pipe 20. WF ₂₂ is attached. It should be noted that the weft yarns Y ₁ and Y _{2 that} have been wefted normally pass through the weft feeler WF ₁ at their tips, but do not reach either of the weft feelers WF ₂₁ or WF ₂₂ . That is, if the lengths of the wefts Y ₁ and Y ₂ that satisfy this condition are defined as the specified lengths, the wefts Y ₁ and Y ₂ that do not pass the weft feeler WF ₁ are
Show topics and Ben topics below the specified length,
Also, after passing through the weft feeler WF ₁ ,
F ₂₁ , or wefts Y ₁ and Y ₂ that have passed the weft feeler WF ₂₂
Indicates that the body is broken or excessively long, and all of these indicate that weft insertion is abnormal.

Now, when the weft yarn Y ₁ is selected, the motor 12 is driven by the yarn type selection signal for notifying this, the nozzle 11 is rotated, and the nozzle hole 11a is directed toward the catching pipe 20 side (see FIG. 2 (A )). Then, when the tip of the weft Y ₁ reaches the position of the weft feeler WF ₁ and injects air from the nozzle hole 11a, the tip of the weft Y ₁ passes through the slit R ₁ and is captured. Guided in the pipe 20, the weft Y ₁
It is bent by the front end edge of the reed blade R ₂ forming the immediate upstream side of the slit R ₁ , and the tension can be maintained until the reed is beaten.

When the weft yarn Y ₂ is selected, the motor 12 which receives the yarn type selection signal rotates the nozzle 11 so that the nozzle hole 11 a
Is rotated about 70 to 80 degrees, and the jetting direction of the nozzle 11 is directed toward the traveling direction side of the weft Y ₂ (FIG. 2B). As a result, the front end portion Y _2b of the weft yarn Y ₂ that has run out of the trunk can be reliably conveyed to the weft feeler WF ₂₁ and detected.

When the weft Y ₁ is broken, the weft feeler WF
_Although it is possible to detect it by means of ₂₂ , the weft feeler WF ₂₂ can omit this, because generally, the weft that needs to maintain tension has a high strength and it is extremely rare to cause a cylinder break. As the motor 12, not only a general electric motor but also any type such as a rotary solenoid and an air motor can be used.

Other Embodiments The nozzle 11 is formed by combining two nozzles 11f and 11b integrally, instead of selectively changing the injection direction using the motor 12, and heading toward the trapping pipe 20 side, respectively. Nozzle hole 11f ₁ , nozzle hole 11 facing the weft Y traveling direction
b ₁ may be formed (FIG. 3). At this time, the yarn type selection signal is used to control, for example, a three-way valve for switching an air flow path interposed between the nozzle 11 and a pressure air source (not shown), and the nozzle holes 11f ₁ and 11b ₁ If one of the above is selected, the ejection direction of the nozzle 11 can be easily selected.

Advantageous Effect of the Invention As described above, according to the present invention, it is necessary to maintain the tension before the beating by making the jetting direction of the nozzle selectable between the capture pipe side and the weft traveling direction side. Since a single nozzle can deal with a weft with a line and a weft that does not need to maintain tension, compared to the case of using an independent nozzle for each jet direction, In terms of space and space, there is an excellent effect that the restriction can be remarkably relaxed.

[Brief description of drawings]

FIG. 1 and FIG. 2 show an embodiment, FIG. 1 is an explanatory diagram of the overall configuration, and FIGS. 2A and 2B are operational explanatory diagrams. FIG. 3 is a view corresponding to FIG. 2 showing another embodiment. FIG. 4 is a view corresponding to FIG. 2 showing a conventional example. R ... Reed R ₁ ... Slit R ₆ ... Weft flying path Y, Y ₁ , Y ₂ ... Weft 11 ... Nozzles 11a, 11f ₁ , 11b ₁ ... Nozzle hole 12 ... Motor 20 ... Capture pipe

Claims (3)

[Scope of utility model registration request] 1. A catch pipe that opens from the rear surface side of the reed with respect to a slit that communicates the front and rear of the reed at the terminal end portion of the weft flying path, and a nozzle that is arranged on the front side of the reed, facing the catch pipe. The weft tensioning device of the loom, wherein the nozzle is capable of selecting the jetting direction between the capture pipe side and the weft traveling direction side. 2. The weft tensioning device for a loom according to claim 1, wherein the nozzle has a motor for switching the jetting direction. 3. The weft tensioning device for a loom according to claim 1, wherein the nozzle has a plurality of nozzle holes corresponding to the jetting direction.