JPH0318529Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a fluid jet type weft tacking device for a loom, and more specifically a fluid jet type in which the weft storage section operates in synchronization with the main shaft of the loom. This invention relates to a device for temporarily taking over and retaining the weft on the storage section of a length measurement storage device when the loom is reversed in a type loom.

(Prior Art) In the above-mentioned type of loom, generally the length measuring and storage device side is operatively connected to the loom side and moves synchronously. By the way, if an accident occurs on the loom, such as a defective weft insertion, the loom side is reversed for repair work, and along with this, the storage drum on the length measuring storage device side is also naturally reversed. become. However, since the weft yarn is wound around the storage drum, when the storage drum is reversed in this manner, the weft yarn on top of the weft yarn is unwound and becomes frayed or tangled.

In order to avoid such inconvenience, a clutch is interposed between the length measuring storage device and the loom, and when the loom is stopped, this clutch is automatically opened so that the length measuring storage device follows the reversal of the loom. Things are being done to avoid this. However, according to such a system, when the loom is restarted, it is necessary to align the phases of the length measurement storage device and the loom.
If this is done manually, it is very time consuming and likely to be inaccurate. Also, if you want to do it automatically,
A very complex mechanism is required to detect the phase difference between the length measurement storage device and the loom, and to correct rotation of the length measurement storage device according to the results, which is disadvantageous in terms of cost. I can't escape it.

In other words, a system in which a clutch is interposed between the length measuring storage device and the loom has the unavoidable drawback that it is necessary to align the loom side and the length measuring storage device when restarting the machine. There is.

(Summary of the invention) The purpose of this invention is to move the length measurement storage device side in synchronization with the loom side, while making phase alignment after repair work following reversal of the loom side unnecessary with an extremely simple device configuration. There is a particular thing.

Therefore, in this invention, a gravity-biased movable yarn guide is provided between a pair of fixed yarn guides, and a holding mechanism holds it on a straight line connecting the fixed yarn guides during normal operation, and the loom The gist is to move this when the machine is stopped.

(Embodiment) What is shown in FIG. 1 is an example of a temporary retention device of this invention, and as shown in FIG. , which is disposed between the drive roller 2 and the yarn feeder 1 and engages with the weft W as described later.

Now, in FIG. 1, F indicates the yarn supplying body 1 side, and D indicates the storage drum 3 side. The frame of the loom (not shown) is attached to a board 1 which is appropriately fixed.
1 has a guide plate 12 extending downward and extending substantially vertically.
is fixed, and a total of three rollers 14 on the left and right sides installed on the shuttle 13 are attached to this guide plate 12.
is held from both sides. Further, the shuttle 13 is provided with a movable thread guide 17, and in line with this, first to third fixed thread guides 21, 22, and 23 are installed on the base plate 11 in order from the upstream side. Of these, the second and third fixed thread guides 2
2 and 23 are arranged with the movable thread guide 17 in between. A rotary solenoid 15 is fixed to the base plate 11 with its axis parallel to the roller 14, and an arm 16 fixed to the output shaft of the rotary solenoid 15 is in contact with the lower side of the front protrusion 13a of the shuttle 13 in the illustrated state. is held in the raised position shown.

Between the first and second fixed yarn guides 21 and 22, a clamper 32 driven by a tube solenoid 31, which is also fixed to the base plate 11, is connected to the weft yarn W.
are placed between them. Also, shuttle 13
A sensor 33 is fixed to the substrate 11 at the rear of the substrate 11 in a position corresponding to the highest position of the shuttle 13, that is, the highest position that can be raised by the weft tension.

In the above, the rotary solenoid 15 and the tube solenoid 31 are connected to a stop signal generation mechanism (not shown) of the loom, and are also electrically connected to the sensor 33, and upon receiving the output signal from the sensor 33, respectively, as described below. works.

Next, the operation will be explained. When an accident occurs on the loom and a stop signal is generated, the tube solenoid 31 is activated and the clamper 3 is activated.
2 is closed to sandwich the weft W. Subsequently, this signal drives the rotary solenoid 15 to rotate the output shaft and swing the arm 16 downward. Then, the shuttle 13 which has lost its support becomes able to descend along the guide plate 12. However, at this point, the weft is taut, so shuttle 1
3 has not descended yet.

Next, when the loom side is reversed, the weft on the storage drum 3 is rewound. By this rewinding, the storage drum 3
Looseness occurs in the weft yarn part on the more upstream side, but in this part, the weft yarn W is connected to the second and third fixed yarn guides 22 and 23 in the front and back, and the movable yarn guide 1 in the middle.
7, and the shuttle 13, which is integrated with the movable thread guide 17, is in a state where it can be lowered downward, so the shuttle 13, which has lost its hold due to the tension of the weft thread, descends, and the weft thread is moved to the position shown in Fig. 2. As shown, it forms a U-shape that opens upward. That is, the storage drum 3
The weft yarn that is rewound from the weft is picked up by this temporary fixing device 10 and temporarily fixed.

Next, prior to restarting the loom, for example, the weft threads pulled up by the tacking device 10 are manually pulled up together with the weft threads on the storage drum 3. As a result of this, the tension of the weft yarn returns, causing the shuttle 13
is pulled up and rises along the guide plate 12.
At this time, the piston 5 is actuated or the length measuring roller 7 and the driving roller 2 are separated manually so that the weft can be freely drawn out. When the shuttle 13 reaches the highest position, the sensor 33 detects this, and the output signal causes the rotary solenoid 15 to reversely rotate, swinging the arm 16 upward and holding the shuttle 13 at that position. Further, in response to this signal, the tube solenoid 31 is driven to open the clamper 32 to open the weft yarn W.
release.

Note that it is effective to use the tacking device 10 of this invention in combination with a defective weft removal device. For example, using a defective weft removing device that winds up the continuous weft between the main nozzle 4 and the woven fabric, the gripper 6 is in an open state, and the length measuring roller 7 is separated from the drive roller 2. Activate the removal device. Then, the weft yarn taken up by the tacking device 10 along with the defective weft yarn is automatically wound up in the removing device.

Furthermore, if the weft yarn is cut for some reason during the winding process, the shuttle 13 will not rise and the sensor 33 will not output a detection signal.
Therefore, by using a timer, if a detection signal is not output within a predetermined period of time, it can be determined that there is a winding failure.

(Effects of the invention) In the device of the invention, there is no clutch between the storage device side and the loom side, and the two are directly connected, so phase alignment after repair work is not necessary. Moreover, for this reason, even if the storage drum is reversed due to the reversal of the loom, the shuttle 13 will absorb the unwinding of the weft yarn.
Since the weft is temporarily absorbed by the lowering of the weft, fraying and entanglement of the weft yarn on the storage drum due to the reversal can be completely prevented. The shuttle 13 is simply the guide plate 1
Since it only moves up and down along 2, the movement is simple, and the configuration for that purpose is also very simple.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing an example of the temporary fixing device of this invention, and FIG. 2 is a side view showing the arrangement position of the device. DESCRIPTION OF SYMBOLS 1... Yarn supply body, 3... Storage drum, 4... Main nozzle, 10... Tempering device, 12... Guide plate, 13... Shuttle, 15... Rotary solenoid, 17... Moving yarn guide, 21, 22,
23... Fixed thread guide, 31... Tube solenoid, 32... Clamper.

Claims (1)

[Scope of Claim for Utility Model Registration] Used in a loom in which the weft storage section operates in synchronization with the main shaft of the loom, and is provided spaced apart upstream and downstream between the yarn supplying body and the length measurement storage section. a movable yarn guide that engages with the weft between the fixed yarn guides and is biased by gravity; and a movable yarn guide that engages with a supporting member of the movable yarn guide during normal operation. A holding mechanism is provided on the upstream side of the fixed thread guide and is closed when the loom is stopped. A weft tacking device for a fluid jet loom, comprising a clamper for holding a weft.