JPH052634Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a tuck-in selvage assembly device that forms selvage tissue by folding back the ends of beaten weft yarns in a fragment loom and inserting them into the next warp opening. .

<Prior Art> As a conventional tuck-in selvage device of this type, there is one described, for example, in Japanese Patent Application Laid-open No. 193557/1983.

This consists of a tuck-in needle that swings to catch the end of the beaten and cut weft, fold it back, and insert it into the next warp opening, and a tack-in needle that is installed on the selvedge side of the cutter for cutting the weft. It is equipped with a thread holder (however, conventionally, it was a mechanical thread holder) that holds the weft end until it is captured by a quinne needle, and these are activated at a predetermined timing to form a tuck-in selvage. It is.

<Problems to be solved by the invention> However, in such a conventional tuck-in selvedge assembly device, a mechanical thread gripper is used to hold the weft end until it is caught by the tuck-in needle. For example, the weft yarn may be slack when gripped, or the grip may become loose and the weft yarn may become slack.
Furthermore, it is very difficult to match the timing of cutting by the cutter and the timing of gripping the weft yarn, which is also a cause of the above-mentioned sagging of the weft yarn.

Therefore, the applicant of the present invention proposed in Japanese Patent Application Laid-open No. 188404/1988 that the yarn holder is constituted by an air nozzle that pulls and holds the ends of the weft yarns by the action of air flow.

According to this, as soon as the weft end is cut by the cutter and becomes free, it is pulled and held in a tensioned state by the air nozzle type yarn holder, and moreover, the air flow acts to constantly apply tension to the weft. Therefore, the weft yarn does not become sagging, and the weft yarn can be reliably captured by the tuck-in needle.

However, when weft ends are folded and inserted, that is, when the tuck-in needle hooks the weft threads and brings them into the warp opening, it is better to apply sufficient tension to the weft threads to form the selvage, and thus to improve the air flow. It is necessary to strengthen the traction and holding force, but if this strength is constantly maintained, the weft will break during the holding time until it is captured by the tuck-in needle, resulting in tuck errors and uneven tuck amounts, so it is still necessary to improve it. There was room for.

The present invention was developed in view of these points, and its purpose is to appropriately control the pulling and holding force caused by the air flow in the air nozzle type thread holder to better form ears. The goal is to make it possible.

<Means for Solving the Problems> Therefore, the present invention consists of a yarn holder consisting of an air nozzle that pulls and holds the weft ends by the action of air flow, and a high-pressure air supply circuit and a low-pressure air supply circuit connected to the air nozzle. A valve mechanism is provided which connects the air nozzle to the air supply circuit and communicates the air nozzle with the high pressure air supply circuit when the weft end is folded and inserted, and communicates with the low pressure air supply circuit during the remaining period.

<Function> In the above configuration, low-pressure air is supplied during the waiting time until the weft is caught by the tuck-in needle, and the weft end is pulled and held within a range that does not cause the weft to break, and the weft is caught by the tuck-in needle. During folded insertion, high-pressure air can be supplied to provide sufficient tension while forming ears.

<Example> An example of the tuck-in ear assembly device according to the present invention will be described below.

FIGS. 2 and 3 show a tuck-in selvage assembly device on the weft insertion side.

Reference numeral 1 denotes a gearbox which constitutes the main body of the selvedge assembly device, in which rotation of the main shaft of the loom is transmitted to an input shaft 4 via a toothed belt 2 and a toothed pulley 3, and the rotation is internally converted into various motions. This gearbox 1 is fixed via a mounting base 5. 6 is a warp, 7 is a cloth front, and 8 is a cloth front holding plate.

Reference numeral 10 denotes a tuck-in needle, which is the tip of an arm 13 which is secured by a bolt 12 to one end of an actuating rod 11 that protrudes from the rear surface of the gear box 1 and swings back and forth in the axial direction (reciprocating angular movement). It is fixed to the section with bolts 14. The weft is curved as a whole and has a hook portion 10a at its tip, which catches the end of the beaten and cut weft and inserts it into the next warp opening.

Reference numeral 20 denotes an air nozzle type holder that pulls and holds the end of the weft yarn under tension until it is captured by the tuck-in needle 10, and is fixed by a bolt 24 to a bracket 23 which is fixed to a lever 21 (described later) with a bolt 22. a letter-shaped hollow member 25;
The hollow member 25 has a pipe-shaped air nozzle 26 projecting downward from the tip thereof, and a notch 27 formed on the rear circumferential surface of the air nozzle 26 is used as a selvage and a cutter 30 (described later). It is located approximately on the warp line behind the weave 7 between the two. Then, a flexible air supply pipe 28 from an air supply circuit, which will be described later, is connected to the hollow member 25, and the air nozzle 2
6 has a notch 27 as shown in FIGS. 4 and 5.
An air outlet 29 is provided upwardly and connected to the inside of the hollow member 25, facing downward.

A scissor-type cutter 30 includes a fixed blade 31 and a fixed blade 32, and cuts the edge of the beaten weft. 31a is the tip of the fixed blade 31, 32a
is the tip of the movable blade 32.

Here, the fixed blade 31 is fixed to the side surface of the cutter support 33. And cutter support 33
has a fitting portion 34 which is slidably fitted into a dovetail groove 36 formed on the rear surface of a bracket 35 and fixed with a bolt 37. The insertion hole for this bolt 37 is a long hole 38, which allows the cutter support 33 to be attached to the bracket 3.
5, it can be adjusted in the width direction of the loom. Further, the bracket 35 is fixed to the side surface of the gear box 1 by a bolt 39, and the hole through which the bolt 39 is inserted is also a long hole 40, so that the mounting position of the cutter support 33 together with the bracket 35 can be adjusted in the front-rear direction of the loom. It is as follows.

The movable blade 32 is rotatably supported within a cutter support 33 and is attached to the end of a shaft 41 that protrudes through a fixed portion of the fixed blade 31. One end of an adjustment rod 44 is rotatably fitted into a boss 43 fixed to an arm 42 integral with the movable blade 32, and is prevented from coming off by a washer 45 and a nut 46. A threaded portion 44a at the other end of the adjustment rod 44 is screwed into one end of a link 47, and is prevented from coming off with a lock nut 48.
The other end of the link 47 is rotatably connected to a pin 50 protruding from a lever 49, which will be described later.

Reference numeral 52 denotes a weft guide, which is fixed to the cutter support 33 so as to be located side by side with the cutter 30 on the side of the fabric selvedge, and has an inclined guide portion 5 on its upper edge.
2a and a locking recess 52b, the weft yarn guided along the inclined guide portion 52a during the beating process is locked in the locking recess 52b, and the weft yarn guided along the inclined guide portion 52a during the beating process is locked in the air flow action area of the air nozzle 26 in the yarn holder 20. It is located within a certain notch 27 and within the opening of the cutter 30.

The levers 21 and 49 are rotatably attached to a common fixed shaft 54 projecting from the bracket 35. These levers 21 and 49 are biased by springs 55 and 56, respectively, to bring the cam followers 57 and 58 mounted in the middle into contact with cams 61 and 62 mounted on the rotating shaft 60 that protrudes from the gearbox 1 and rotates. There is.

Here, the air supply circuit to the air nozzle 26 of the air nozzle type yarn holder 20 is constructed as shown in FIG.

That is, the pipe line from the pressure air supply source is branched into a high pressure side circuit 70A and a low pressure side circuit 70B, and the high pressure side circuit 70A is equipped with a pressure regulator 71A and a solenoid valve 72.
A is interposed therein, and a pressure regulator 71B, a solenoid valve 72B, and a check valve 73 are interposed in the low-pressure side circuit 70B. And high voltage side and low voltage side circuits 70A, 7
0B joins them on the downstream side, then branches and connects to the air nozzle type yarn holder 20 (air nozzle 26) of the tuck-in selvedge assembly device on the weft insertion side, and connects to the tuck-in selvedge on the anti-weft insertion side. It is connected to the thread holder 20' of the braiding device. And solenoid valve 72
The solenoid valve 72B is opened and closed in synchronization with the rotation of the main shaft of the loom by a control circuit (not shown), and the solenoid valve 72B is opened during operation of the loom. The high pressure side circuit 70A including the pressure regulator 71A constitutes a high pressure air supply circuit, the low pressure side circuit 70B including the pressure regulator 71B constitutes a low pressure air supply circuit, and the solenoid valves 72A, 72
B constitutes a valve mechanism.

Next, the effect will be explained. In addition, FIG. 6 shows the movement locus of the tuck-in needle 10, and FIG. 7 shows the tuck-in needle 10 and the air nozzle type yarn holder 2.
0 and the operation timing of the cutter 30 and the like.

After the weft is inserted, when the reed is beaten by the advance of the reed, the weft moves along the inclined guide portion 52a at the weft guide 52 and finally reaches the locking recess 52b.
It enters and locks into place, and remains in this position even when the reed is moved back. In this state, the weft yarn stretched between the selvedge and the weft guide 52 is located within the opening of the cutter 30 and within the notch 27 of the air nozzle 26 in the yarn holder 20 (see FIG. 5A). situation).

Immediately after the beating, the lever 4 is moved by the cam 62.
9. The movable blade 32 of the cutter 30 is driven via the link 47, the adjustment rod 44, etc., and the fixed blade 31
The weft yarn is cut in cooperation with the

At this time, the weft yarn between the weave selvage and the cutter 30 is already located within the notch 27 which is the air flow action area of the air nozzle 26, so when the weft yarn is cut by the cutter 30, the cut fabric The weft end on the ear side is connected to the air outlet 29 in the air nozzle 26.
Due to the action of the air jet from the air jet and the suction air flow generated around it, the air is sucked into the air nozzle 26 from the notch 27, and is pulled and held by the air flow (fifth
Figure B). This state of pulling and holding continues until the weft is delivered to the tuck-in needle 10 after the next weft insertion, but since the weft is pulled and held by the air flow, no slack occurs.

Here, during the waiting time until it is captured by the tuck-in needle 10, the solenoid valve 72A of the high pressure side circuit 70A is controlled to close, and the low pressure regulated by the pressure regulator 71B of the low pressure side circuit 70B is Air is supplied to the air nozzle 26 of the yarn holder 20, and the amount of air supplied is small, so that the flow of air jetted from the air outlet 29 is relatively weak. Therefore, there is no possibility that the weft yarn will be torn during this waiting time.

Next, the next weft yarn is inserted and the reeding process begins, during which time the tack-in needle 10 first moves to the rear of the loom (to the left in Figure 2) and then counterclockwise in Figure 3. In the middle of the swing, the upper warp threads 6 are pushed aside, the upper warp threads 6 are pushed aside, the threads enter the opening, and the warp threads 6 exit the warp threads 6 as they are.

Thereafter, the tuck-in needle 10 moves to the front of the loom (to the right in Figure 2), and the weaving selp and thread holder 20
It passes under the weft end stretched between.

After that, the tact-in needle 10 is applied to the third
Swings counterclockwise in the figure.

Thereafter, the touch-in needle 10 starts to swing in the opposite direction, that is, clockwise in FIG. 3, but at this time, the cam 61 drives the lever 21 counterclockwise in FIG. The yarn holder 20 that is currently in place moves substantially downward and presses the weft end stretched between the weaving selvedge and the yarn holder 20 toward the tuck-in needle 10 side. This results in
When the tuck-in needle 10 rotates in the opposite direction, the weft thread is reliably caught in the hook portion 10a, and the tuck-in needle 10 returns to the warp opening in the caught state, so that the weft end is folded back and inserted into the warp shedding in the opposite phase to the part that has already been woven as a woven fabric. Then, the tack-in needle 10 escapes from the warp opening by pushing through the upper warp threads 6, and then also escapes from the reed beating path of the reed.

When the inserted weft is beaten by the advance of the reed, the weft end which has been folded back and inserted into the warp opening as described above is beaten at the same time at the selvedge part, and the weft is tacked in. Ears are formed.

Here, when the tuck-in needle 10 captures the weft end, folds it back, and inserts it into the next warp opening, the solenoid valve 72A of the high-pressure side circuit 70A is controlled to open, and the pressure regulator 71A of the high-pressure side circuit 70A controls the opening of the solenoid valve 72A. The regulated high-pressure air is supplied to the air nozzle 26 of the yarn holder 20, the amount of air supplied increases, and the flow of air injected from the air outlet 29 becomes strong.
Therefore, the traction and holding force during this period increases,
Sufficient tension is applied to the weft threads, resulting in good selvage formation.

Note that the air injection may be stopped during the remaining period other than when the weft end is folded and inserted and does not contribute to pulling and holding the weft, although this is a very short period.

Further, although this embodiment mainly shows the tuck-in selvage assembly device on the weft insertion side, it goes without saying that the same applies to the tuck-in selvedge assembly device on the non-weft insertion side or for the middle ear.

<Effects of the invention> As explained above, according to the invention, by applying high pressure to the air supplied to the air nozzle type yarn holder at the time of folding and inserting the weft end, good selvage formation is achieved while providing sufficient tension. On the other hand, by supplying low-pressure air during the remaining period, it is possible to prevent the weft from tearing during the waiting time until it is captured by the tuck-in needle, and it also has the effect of leading to a reduction in air consumption. can get.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of an air supply circuit to an air nozzle type yarn holder showing an embodiment of the present invention, Fig. 2 is a side view of the tuck-in selvedge assembly device, and Fig. 3 is a front view seen from the rear of the loom. , FIG. 4 is an enlarged side view of the air nozzle type yarn holder, FIG. 5 is a cross-sectional view of FIG. 4, FIG. 6 is a schematic plan view showing the movement locus of the tuck-in needle, and FIG. FIG. 3 is a diagram showing the operation timing of a needle, an air nozzle type yarn holder, etc. 1... Gear box, 10... Tuck-in needle, 20... Air nozzle type thread holder, 26...
Air nozzle, 27... Notch, 29... Air spout, 30... Cutter, 52... Weft guide, 70
A...High voltage side circuit, 70B...Low voltage side circuit, 71
A, 71B...Pressure regulator, 72A, 72B...Solenoid valve.

Claims (1)

[Scope of utility model registration request] A tuck-in needle 10 swings to catch the end of the beaten weft, fold it back, and insert it into the next warp opening, and a thread holder 20 holds the weft end until it is caught by the needle. In the tuck-in selvedge assembly device for a shearing loom, the yarn holder 20 is constituted by an air nozzle that pulls and holds the weft ends by the action of air flow, and the air nozzle is equipped with a high-pressure air supply circuit 70A and a low-pressure air supply circuit 70B. A piece loom characterized by being provided with valve mechanisms 72A and 72B which connect the air nozzles to the high-pressure air supply circuit 70A when the weft ends are folded and inserted, and communicate with the low-pressure air supply circuit 70B during the remaining period. Tatsu-in ear assembly device.