JPH0457777B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to a weft thread drawing device for setting weft threads in a drum-type weft storage device of a loom.

<Prior art> Conventionally, as shown in, for example, Japanese Patent Application Laid-Open No. 57-39360, a weft thread is drawn from one end surface of a rotating shaft through a shaft hole formed in the shaft core, and the outer circumferential surface of the intermediate portion of the rotating shaft is In a drum-type weft storage device, in which the weft is pulled out from a draw-out port and stored by being wound around a drum supported at the other end of the rotating shaft, when setting the weft, it is necessary to pull the weft through the shaft hole. be. For this reason, in the device described in the same publication, an air injection nozzle for drawing the weft yarn is provided opposite to the entrance of the shaft hole.
If the weft thread is drawn through the air stream in this way, the weft thread can be pulled through very easily.

However, in order to create the air flow for drawing the weft threads, a pressure higher than a predetermined value is required, and for looms that use high-pressure air, such as air-jet looms, it is easy to use high-pressure air. However, for looms that do not use high-pressure air, such as water-jet looms, there is a problem in that a new high-pressure air generator and piping must be installed.

<Object of the Invention> In view of the above-mentioned problems, the present invention aims to generate pressurized air for weft thread pulling without using a special high-pressure air supply source, thereby making it possible to pull the weft thread through. purpose.

<Object of the invention> For this reason, the present invention utilizes the air discharged from a blower installed in a water-jet loom, but the air discharged from the blower has a large volume but a low pressure, so it cannot be used as it is. Since this is not possible, the flow rate on the discharge side of the blower is regulated to increase the pressure on the discharge side.

Specifically, a thread guide tube is inserted into the entrance of the shaft hole of the rotating shaft, and air is introduced between the outer circumferential surface of the tip of the thread guide tube and the inner circumferential surface of the shaft hole in the weft drawing direction. While forming an air injection outlet, an air release port and a communication port communicating with the air injection outlet are provided on the discharge port side of the blower whose suction port is connected to the suction airflow acting part of the water injection loom. and further provided with a valve device for adjusting at least the degree of opening of the atmosphere opening.

<Example> Examples will be described below.

Figure 1 shows an overview of a water jet loom, in which 1 is a warp beam, 2 is a warp, 3 is a back crawler, and 4 is a warp beam.
5 is a heddle, and 5 is a reed, in which a weft 8 stored in a weft storage device to be described later is inserted into a warp opening 6 formed by the heddle 4 with water jet from a weft insertion nozzle 7, and the weft 8 is A woven fabric 10 is woven by reeding the woven material onto the fabric front 9 using a reed 5. The woven fabric 10 is then pulled by a weaving density adjusting device 12 through a dewatering tube 11 and wound around a cross roller 13.

Here, the dehydration cylinder 11 has a slit 14 and communicates with a suction port 17 of a blower 16 via a steam/water separator 15. Therefore, the blower 16
When sucking air through the slit 14, the woven fabric 10 is dehydrated by sucking the moisture contained in the woven fabric 10 along with the air. 18 is a discharge port of the blower.

Next, the weft storage device 20 will be explained with reference to FIGS. 2 and 3.

A housing 23 is fixed by bolts 22 to a bracket 21 fixed to the frame of the loom, and a rotary shaft 25 is rotatably supported by the housing 23 via a bearing 24. Rotating shaft 25
A gear 26 is fixed in the middle thereof, and is adapted to be rotated from the main shaft of the loom at a predetermined transmission ratio. Further, a handle 28 for manual rotation is fixed to the rear end of the rotating shaft 25 by a nut 27.

A drum support 30 is attached to the tip of the rotating shaft 25 via a bearing 29 so as to be relatively rotatable.
A drum 32 is fixed to this drum support 30 with bolts 31. A permanent magnet 33 is embedded in a part of the drum 32. A permanent magnet 35 is attached to a stay 34 protruding from the bracket 21, and these magnets 33,
35 allows the drum 32 to remain stationary. A tapered portion 36 tapered from the rear end side and a straight portion 37 connected to the tapered portion 36 are formed on the outer circumferential surface of the drum 32. However, the straight portion 37 is also slightly tapered. Additionally, a tapered portion 36 is provided on the outer peripheral surface of the drum 32.
Holes 38 and 39 are formed near the boundary between the straight portion 37 and the tip of the straight portion 37, and locking pins 40 and 41 enter and exit the holes 38 and 39 at predetermined timings, respectively. .

A winding arm 42 is attached to the center of the rotating shaft 32 in a direction perpendicular thereto and is fixed with a nut 43, and the winding arm 42 has a guide 44 at its tip.

A fiber guide tube 46 is inserted into the shaft hole 45 of the rotating shaft 25 from the rear end side and fixed with an adhesive or the like. A fiber guide tube 47 is formed at the axis of the fiber guide tube 46, and the outer circumferential surface of the distal end portion is formed into a tapered shape 48.
Further, the shaft hole 45 communicates with an outlet 50 having a guide 49 that opens on the outer circumferential surface of the rotating shaft 25 .

Here, the weft yarn 8 is inserted into the yarn guide hole 4 of the yarn guide tube 46.
7 into the shaft hole 45 of the rotating shaft 25, and the outlet 5
0, pull it through the guide 44 of the winding arm 42, and attach it to the locking pin 40 or the locking pin 4 on the drum 32.
1, the weft thread 8 is passed through the weft inserting nozzle 7, and the winding arm 42 is rotated around the drum 32 held stationary by the rotation of the rotating shaft 25, so that the weft thread 8 is inserted into the drum 32. The weft is wound around and stored, and at the weft insertion timing, it is pulled out by the weft insertion nozzle 7 and inserted. 51 is a cover for regulating ballooning.

The weft drawing device includes an air outlet 52 formed between the outer circumferential surface of the tapered part 48 of the yarn guide tube 46 and the inner circumferential surface of the shaft hole 45 of the rotating shaft 25.
One end of an air guide hole 53 formed in the rotary shaft 25 is exposed to the rear portion of the rotary shaft 25. Then, the other end of the air guide hole 53 is connected to a cover 54 and a gasket 55 around the rotating shaft 25.
It faces an air chamber 56 formed by.
A nipple 57 is screwed into the cover 54, and one end of a pipe 58 is connected and fixed to the nipple 57. On the other hand, referring to FIG. 4, a manual on-off valve 54 is provided at the air release port on the discharge port 18 side of the blower 16, and a communication port is provided from the side wall upstream of the on-off valve 59 in a direction perpendicular to the discharge direction. A branch pipe 60 is provided as a branch pipe. The other end of the pipe 58 is connected and fixed to the branch pipe 60. The reason why the branch pipe 60 is provided at right angles is to prevent almost any air from flowing toward the branch pipe 60 when the on-off valve 59 is opened.

The on-off valve 59 is constructed as shown in FIG. 5A. That is, a valve body insertion hole 63 is formed in the frame 61 and is perpendicular to the air passage 62 on the atmosphere opening side connected to the discharge port 18 of the blower 16.
3, a cylindrical valve body 64 is rotatably inserted through an O-ring 65. A through hole 66 facing the air passage 62 is formed in the valve body 64 . A compression spring 68 is provided between the spring retainer 67 fixed to one end of the valve body 64 and the frame body 61.
is interposed so that the valve body 64 is held in a predetermined position. A handle 69 for rotational operation is provided at the other end of the valve body 64. Therefore, the valve can be opened by operating the handle 69 and rotating the valve body 64 so that the through hole 66 is in the same direction as the air passage 62, as shown in FIG. 5B. Moreover, the valve can be closed by making the through hole 66 orthogonal to the air passage 62 as shown in FIG. 5C.

Further, in FIG. 4, 70 is a limit switch, which is fixed to the casing of the blower 16 via a stay 71, and the handle 6 is placed in the fully closed position of the on-off valve 59.
It is designed to be closed when 9 is operated. However, the closure is not necessarily limited to the fully closed position, but may be closed at a partially open position as long as a predetermined pressure air can be obtained to the branch pipe 60 side.

This limit switch 70 is incorporated into the circuit shown in FIG.

To explain the circuit shown in FIG. 6, a series circuit including an auxiliary equipment starting switch 72 and a relay 73 is connected to the power supply via a normally closed contact 84b of a relay 84, which will be described later. It is inserted into the power supply circuit 75 of the motor 74. Also, a relay 76 is connected in parallel with the relay 73.
The contact 76a of this relay 76 is inserted into the power supply circuit 78 of the left and right heat cutters 77. Further, a series circuit of a normally closed stop switch 79 and a self-holding contact 73b of the relay 73 is connected in parallel with the auxiliary equipment start switch 72. Further, a series circuit consisting of a loom starting switch 80 and a relay 81 is connected in parallel with the relays 73 and 76, and a contact 81a of this relay 81 is inserted into a power supply circuit 83 of a loom driving motor 82.
Further, a self-holding contact 81 of a relay 81 is connected in parallel with the loom starting switch 80.

Further, a series circuit of a limit switch 70 and a relay 84 is connected to the power supply, and this relay 84
The contact 84a is inserted into a power supply circuit 85 provided in parallel with a power supply circuit 75 having a contact 73a for the loom driving motor 82.

Next, the action will be explained.

First, the normal starting operation of a loom will be explained.
Normally, the on-off valve 59 is operated to the fully open position,
Since the limit switch 70 is in the open state, the relay 84 is inactive and the contact 84b is in the closed state.

When the auxiliary equipment starting switch 72 is closed in this state, the relays 73 and 76 are energized, the self-holding contact 73b is closed to perform self-holding, and the contacts 73a and 76a are closed to drive the blower. The motor 74 and heat cutter 77 operate.

Next, when the loom starting switch 80 is closed,
The relay 81 is energized and the self-holding contact 81b is closed to perform self-holding, and the top of the contact 81 is closed to operate the loom driving motor 82.

When the stop switch 79 opens, the relay 7
3, 76, and 81 are released, and the loom and auxiliary equipment stop.

Prior to the above-mentioned starting operation, the weft storage device 20
When setting the weft yarn 8, first turn the handle 69 of the on-off valve 59 counterclockwise in FIG. 4 to the fully closed position (FIG. 5C). This closes the limit switch 70, energizes the relay 84, opens the contact 84b, and closes the contact 84a, causing the blower drive motor 74 to operate.

As a result, the blower 16 is activated and the dehydrator 1
The air sucked in from the slit 14 of 1 is passed through the discharge port 18
However, since it is closed by the on-off valve 59, it is discharged to the branch pipe 60 side and fed into the air chamber 56 via the pipe 58 and nipple 57. Then, the air reaches the air outlet 52 from the air chamber 56 through the air guide hole 53, is ejected from the air outlet 52, and flows inside the shaft hole 45 toward its distal end. Here, with respect to the discharge flow rate of the blower 16, the air outlet 52
Since the cross-sectional area of is extremely small, the flow rate is converted into a pressure head, creating a high-speed airflow flowing out from the shaft hole 45 to the outlet 50. This airflow generates a negative pressure airflow toward the tip in the thread guide tube 46, so when the tip of the weft yarn 8 is brought to the rear end of the thread guide tube 46, that is, to the entrance of the thread guide tube 47, the air flow It gets sucked in. Then, when it comes out of the thread guide tube 47,
It is blown away by the high-speed airflow in the shaft hole 45 and flies out from the outlet 50, completing the drawing of the weft yarn 8.

During this process, I accidentally turned off the auxiliary equipment start switch 72.
Even if the loom starting switch 80 is closed, the contact 84b remains open, so the heat cutter 77
The loom drive motor 82 does not operate,
By returning the on-off valve 59 to the fully open position, the loom can be started. Therefore, there is no fear of forgetting to operate the on-off valve 59.

According to experiments, a friction blower of 400 W and a discharge flow rate of 1.6 m ³ /min was used as the blower 16.
The total cross-sectional area of the slit 14 is 52.5cm ² , and the air injection port 5
When the cross-sectional area of 2 is 0.133cm ² , the pressure on the blower discharge side is 200mm/Aq when the on-off valve 59 is fully open, whereas it is 600mm/Aq when it is fully open, which is sufficient for use. It was confirmed that

In addition to the above-mentioned on-off valve 59, the valve device includes the above-mentioned on-off valve 59,
A switching valve 90 as shown in FIG. 7 may also be used.
This switching valve 90 has a Y-shaped passage 92 formed in a rotatable cylindrical valve body 91, and a blower 16.
The discharge port 18 is selectively connected to either the atmosphere opening port 93 or the communication port 94 on the drawing device side. Of course, during normal operation, the discharge port 18 is connected to the atmosphere opening port 93 as shown in FIG. 7A, and during lead-through, the discharge port 18 is connected to the device-side communication port 94 as shown in FIG. 7B. The aforementioned pipe 58 is connected to this communication port 94. In this case as well, it is desirable to prevent the loom from starting when the state is switched to the state shown in FIG. 7B.

<Effects of the Invention> As explained above, according to the present invention, the blower provided in the water jet loom can generate a sufficient pressure air flow for weft drawing without using a special high-pressure air supply source. The effect is that the weft can be pulled through by generating the weft.

[Brief explanation of the drawing]

1 to 6 show one embodiment of the present invention, FIG. 1 is a side view of the entire loom, FIG. 2 is a front sectional view of the weft storage device, FIG. 3 is a plan view of the same, and FIG. The figure is a schematic diagram of the air path for drawing the weft thread, Figure 5A is a sectional view of the on-off valve, Figures 5B and C are XX cross-sectional views of Figure A in different operating states, and Figure 6 is the loom. FIG. 3 is a circuit diagram of a drive circuit of FIG. Moreover, FIGS. 7A and 7B are sectional views of a switching valve according to the operating state, showing another embodiment. 8...Weft, 11...Dehydration tube, 16...Blower, 17...Suction port, 18...Discharge port, 20...
Weft storage device, 25...Rotating shaft, 32...Drum, 42...Wrapping arm, 45...Shaft hole, 46...Yam guide tube, 50...Output port, 52...Air jet port, 5
6...Air chamber, 58...Pipe, 59...Opening/closing valve, 60...Branch pipe, 69...Handle, 70...
...Limit switch, 74...Blower drive motor, 90...Switching valve, 93...Atmospheric release port, 94
...Communication port.

Claims (1)

[Claims] 1. The weft thread 8 is drawn from one end surface of the rotating shaft 25 through the shaft hole 45 formed in the shaft core portion, and is pulled out from the outlet 50 on the outer peripheral surface of the intermediate portion of the rotating shaft 25.
In a drum-type weft storage device in which the weft is stored by being wound around a drum 32 supported at the other end,
Inserting the thread guide tube 46 into the entrance part of the shaft hole 45,
An air jet port 52 is formed between the outer circumferential surface of the distal end of the yarn guide tube 46 and the inner circumferential surface of the shaft hole 45 for blowing out air in the drawing direction of the weft yarn 8.
forming an atmosphere opening port and a communication port communicating with the air injection port 52 on the side of the blower 16 and the discharge port 18 connected to the suction airflow acting part of the water injection loom;
The weft thread pulling device for a drum-type weft storage device further comprises valve devices 59 and 90 for adjusting at least the opening degree of the atmosphere opening.