JPS61167052A - Apparatus for detecting flow speed distribution of jet stream in air jet type 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 comprises an air guide groove formed by a row of recesses arranged in the weft direction on the front side of a reed. The present invention is directed to a type of loom that injects air for entering the weft, and relates to a device that is attached to such a loom and detects the flow velocity distribution state of the injected air flow.

(Background of the Invention) As is known, the above-mentioned type of loom uses a main nozzle to inject the weft yarn, and auxiliary nozzles arranged along the air guide groove inject air toward the guide groove, Weft insertion is performed by successively blowing the tips of the weft yarns toward the opposite side of weft insertion while guiding the jet airflow through the guide groove.

Although this type of loom is suitable for wide width weaving, etc., it has the disadvantage of high air consumption per unit weft insertion length.
Therefore, during design and development, in order to increase the guiding function of the air guide groove and improve air economy, we installed a pitot tube type or other current meter to experimentally understand the ripple effects of the jet air flow.

However, since the jet airflows of the plurality of auxiliary nozzles influence each other within the air guide groove, it has been extremely difficult to linearly analyze the airflow distribution state in the entire guide groove.

On the other hand, in a weaving factory, in order to find the functionally and economically optimal injection conditions according to the weaving conditions, the placement position and injection direction of the auxiliary nozzle, as well as the air supply pressure, etc. are adjusted to achieve the appropriate flow rate throughout the air guide groove. Adjustments are made to obtain this, but the reality is that this work relies on the intuition of experts.

SUMMARY OF THE INVENTION An object of the present invention is to linearly and easily detect the state of flow velocity distribution within the air guide groove for the entire guide groove.

(Means of the present invention) The means of the present invention that solves the above problems includes a rail that is integrated with a reed and extends in the weft insertion direction, a carrier that can travel while engaging with this rail, and an engagement of this carrier. The apparatus includes an attitude holding means for maintaining a constant alignment attitude, and a flow velocity detector carried by the carrier, and the flow velocity detection part of the flow velocity detector is disposed within an air guide groove.

(Function) According to the above means, the carrier can travel in the weft insertion direction while holding the flow velocity detector while maintaining a constant posture, so that the flow velocity detection section disposed within the air guide groove is always in the weft direction. It stays at a fixed position on the cross section and moves in the weft direction. Therefore, it is possible to continuously and comprehensively grasp the state of the airflow at the fixed position.

(Example) Figure 1 shows the main parts of a loom to which the present invention is applied.
This is an example.

In the drawing, 1 is a reed, 2 and 3 are upper and lower frames of this reed, respectively, and 4 is a liquid root that is firmly fixed to these upper and lower frames and arranged densely.

This liquid state s4 is called a modified reed blade, etc., and the front part of the liquid state body 4 protrudes in a mountain shape, and a recess 5 is formed at the top thereof, and the row of recesses forms an air guide groove extending in the weft direction. 6. □Then, this R1 is fixed to a reed holder T by its lower frame 3, a T groove 8 extending in the weft insertion direction is formed in this reed holder, and the position of a plurality of auxiliary nozzles 9 can be adjusted using this T#. It is arranged. The auxiliary nozzle 9 has an injection port disposed near the lower edge of the air guide groove 6 and injects air toward the guide groove obliquely to the weft entry side.

10 is a flow velocity distribution detection device according to an embodiment of the present invention, and the outside is covered with a cover 11. In this flow velocity distribution feeding device, a rail extending in the weft direction is attached to the reed 1 or the reed holder 1, and the reed is engaged with the rail so that it can run. In this embodiment, the upper frame 2 of the reed is used as the rail. It was used. Hereinafter, this upper frame 2 will be referred to as a rail 2.

In FIGS. 2, 3, and 4, 20 is a carrier, 21 is a base of this carrier, and base 21 is the upper plate 2.
1J! It is formed by a side plate 21b that hangs down from the front side of this upper plate. 22, 22 are 91 pairs of brackets attached to the lower surface of the upper plate 21a), 23.23 is a running wheel, and 24.
24 is a side roller, and a pair of running wheels 23, 2
3 is disposed on the rear side of each bracket 22 and supported by the bracket, and these are engaged with the upper surface of the rail 2.

Also, a pair of side rollers 24, 24 are attached to each bracket 22.
A press roller 626 supported on the upper end of the shaft 25 (FIG. 3) hanging from the shaft and engaged with the front surface of the rail 2 is a press roller that is elastically engaged with the rear surface of the rail 2.
, 24, and its supporting structure is as follows.

3 and 5 are mainly used, 2T is a bracket installed on the upper surface of the upper plate 21a, 28 is an arm extending rearward from this bracket, and 29 is a ball constructed at the tip of this arm. A joint 30 is a swing shaft that hangs below the upper plate 21a from the arm 28 via this ball joint.A press roller 26 is supported at the lower end of this swing shaft, and a tension spring 31 The press roller 26 is pressed against the rail 2 by urging the press roller 26 forward. Reference numeral 32 denotes a bar for releasing this locking, and as shown in FIG. It is facing the front side. Further, in FIG. 4, reference numeral 34 denotes an operating lever, the middle part of which is supported on a stand 35 projecting downward from the upper plate 21a, the rear end of which is bent as shown in FIG. It is located close to the front side of 32.

Therefore, when the operating lever 34 is rotated counterclockwise in FIG. 4, the swing shaft 30 is rotated rearward via the bar 32.
The press roller 26 is separated from the rail 2.

Mainly using FIG. 3, 40 is a traveling drive means for the carrier 20, 41 is a reversible geared motor fixed on the upper plate 21a, 41a is its output shaft, and 42 is fixed to this output shaft. The coupling 43 is the drive row 2 fastened to this coupling.

The drive row 2 consists of a hub 43m and a tire 43b made of an elastic material such as rubber, which is connected to side rollers 24, 2.
4 and engaged with the front surface of the rail 2 with appropriate elastic contact force as shown in FIG.

As is clear from the above configuration, since the center of gravity of the carrier 200 is located in front of the traveling wheel 23, the carrier tends to tilt forward.

Mainly in FIG. 3, so and so are posture holding means for suppressing this tilting and keeping the above-mentioned engaged posture of the middle carrier 20 constant. In these means, reference numeral 51 denotes a restraining roller, the peripheral portion of which is formed of a tire 51a made of an elastic material such as rubber, and the restraining roller is connected to the lower end of the support shaft 25.25 of a pair of side rollers 24.24. sleeve 5
2,52t-, and as shown in FIG. 2, it is engaged with the front surface of four rows of liquid roots to suppress the above-mentioned tilting movement. 53 is a weight that also serves as a handle, and a traveling wheel 23
It is attached to the upper plate 21a at the rear of ゜23, and this K
Adjust the center of gravity position of the carrier 200 and press the holding roller 51.
The liquid root 4 is prevented from being subjected to a large bending load.

6 is also used, 60 is a pitot tube type flow rate detector, 61 is a pitot tube, 62 is a holder for this pitot tube, 63
is a flow velocity detection section fixed to this holder, and this flow velocity detection section has a built-in flow velocity (pressure)-voltage conversion element. 64 is a clamper that clamps the holder 62, and this clamper t-L
The side plate 2 of the carrier base is attached via the letter-shaped placket 65.
1b, and in this state, the tip of the pitot tube 61, that is, the flow velocity detection part 61a, is placed so as to face the inside of the air guide groove 6 and toward the upstream side of the jet air flow (FIG. 3).

Since the embodiment is as described above, the traveling wheel 23.
23 on the rail 2 and press the press roller 26 against the rail by operating the operating lever 34, the carrier 20
are these foils and rollers, and the length roller 24.
24 and engages with the rail 2 through the press rollers 51, 51.
This engaged posture is maintained by this. When the reversible geared motor 41 is started to drive the drive roller 43 in the normal direction or in the reverse direction, the carrier 20 travels in a desired direction in the weft insertion direction, and the detection section of the pitot tube type flow velocity detector supported on this carrier 61a is held at a predetermined position in the cross section of the air guide groove 6 and moves to detect the air flow velocity in the core portion. Then, the flow velocity detection section 63 converts this detected flow velocity value into a voltage and outputs it, so that the output is subsequently amplified using normal means and recorded on the recording device. Sho carrier 200
Experimentally, it is appropriate that the running speed be approximately 80 crn/min.

FIG. 7 shows an example of the above record, where the vertical axis shows the value obtained by converting the flow velocity into water head pressure, the arrow shows the downstream side (opposite weft entry side) of the jet air flow, and the carrier 20 is shown on the arrow I made it run in the same direction.

The injection port of the auxiliary nozzle 9 exists slightly in front of the peak of this water head pressure curve.

FIG. 8 shows another embodiment of the flow rate detector 10, which includes a plurality of pitot tubes T1, nine in this example.
is placed in the mantle tube 12 and clamped by the clamper T3, and in this state, the flow velocity detection section 71m at the tip of each pitot tube is arranged flush within the air guide path 6, and an ultra-small A connector/flow velocity detection section T4 containing a flow velocity/voltage conversion element is connected thereto.

According to this embodiment, it is possible to grasp the flow velocity distribution within one cross section of the air guide #I#6.

(Effects) As explained above, according to the present invention, the flow velocity distribution of the jet air flow in the air guide groove can be grasped for the entire guide groove, so the analysis results can be used as effective design materials, etc. Alternatively, spray conditions etc. can be appropriately and easily set in a weaving factory.

[Brief explanation of drawings]

FIG. 1 is an explanatory view illustrating the main parts of a loom in which the present invention is implemented and the equipment of the present invention, and FIGS. 2 to 7 are drawings showing details of one embodiment of the present invention, Figure 2 is a partially sectional end view as seen in Figure 1, Figure 3 is a partially sectional side view as seen in Figure 2, Figure 4 is a bottom view as seen in Figure 3, and Figure 5 is a side view as seen in Figure 2. The line ■-■ line cross-sectional view in Figure 3 and Figure 6 are Vl - Vll in Figure 3.
A line cross-sectional view, FIG. 7, is a graph showing one example of the flow velocity distribution detection results according to the above embodiment, and FIG. 8 is an end view of a main part, showing another embodiment. 1...Reed 2...Rail (upper frame of reed)
4...Liquid root 5...Recess 6...Air guide groove 9...Auxiliary nozzle 10...°Flow velocity distribution detection device 20...Carrier 23, 24..., 26...
- Traveling wheel, side roller, press roller 40 as engagement means... Traveling drive means 50... Posture holding means 5
1... Hold down row 2 53... Weight 60, 70.
...Flow velocity detector 61, 71... Pitot tube 61a,
71a...Flow velocity detection unit patent applicant Nissan Motor Co., Ltd. 1!5 Figure LJ

Claims (1)

[Claims] An air guide groove is formed by a row of recesses arranged in the weft insertion direction on the front side of the reed, and is attached to a loom that performs weft insertion by jetting air from an auxiliary nozzle toward the air guide groove, and is integrated with the reed. The present invention includes a rail extending in the weft direction, a carrier capable of traveling while engaging with the rail, an attitude holding means for keeping the engagement attitude of the carrier constant, and a flow velocity detector supported on the carrier. A flow velocity distribution detection device for a jet air flow in an air jet loom, in which a flow speed detection part of a flow speed detector is arranged in an air guide groove.