JPS61174455A - 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] [Industrial Application Field] 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, and an auxiliary nozzle to this air guide groove. The present invention relates to a loom of the type that injects air for weft insertion, and relates to a device that is attached to such a loom and detects the flow velocity distribution state of the jet air flow.

[Background of the Invention] As is known, the above-mentioned type of loom uses a main nozzle to eject the weft yarn, while auxiliary nozzles arranged along the air guide groove inject air toward the guide groove. Weft insertion is performed by sequentially blowing the tips of the weft yarns toward the opposite side of weft insertion while guiding the ejected airflow through guide grooves.

Although this type of loom is suitable for wide woven hats, it has the disadvantage of high air consumption M per unit weft length, so when designing and developing it, the guiding function of the air guiding grooves has to be enhanced. In order to measure air economy, we have installed pitot tube type and other current meters to experimentally understand the 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 the FJ41 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 ensure that the entire air guide groove is properly sprayed. Adjustments are made to obtain the desired flow velocity, 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. It has a posture holding means for maintaining a constant alignment position, and a position detector for detecting the positions of a flow velocity detector and an auxiliary nozzle carried by the carrier, and the flow velocity detection part of the flow velocity detector is positioned within the air guide groove. It is arranged and configured.

[Function] According to the above means, the carrier can travel in the weft 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 connected to the guide groove. Since the position of the auxiliary nozzle can be detected while the auxiliary nozzle is at a fixed position on the cross section and moves in the weft insertion direction, the positional relationship between the auxiliary nozzle and the above-mentioned fixed position is known. Therefore, it is possible to continuously and comprehensively grasp the state of the airflow at the fixed position in relation to the auxiliary nozzle.

[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 root 4 is called a modified reed blade, and the front part of the adult blade root body 4 protrudes in a mountain shape, and a recess 5 is formed at the top thereof, and the row of recesses guides air extending in the weft direction. This constitutes a groove 6. The reed 1 is fixed to a reed holder 7 by its upper frame 3, and a T-slot 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-slot. 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 is surrounded by a cover 11 on the outside. In this flow velocity distribution detection device, a rail extending in the weft direction is attached to the reed 1 or the reed holder 7, and the reed is engaged with the rail so that it can travel.In addition, in this embodiment, the upper frame 2 of the reed is used as the rail. It is something. Hereinafter, this upper frame 2 will be referred to as a rail 2.

In FIGS. 2, 3, and 4, 20 is the base of the carrier 21, and the base 21 is the upper plate 21.
a and a side plate 21b hanging down from the front side of this upper plate. 22.22 is a pair of brackets attached to the lower surface of the upper plate 21a, 23°23 is a running wheel, 24.24
is a side roller, with a pair of running wheels 23, 23 disposed behind each bracket 22 and supported by the bracket;
These are engaged with the upper surface of the rail 2. Also 1
A pair of side rollers 24,24 are supported on the upper ends of shafts 25 (FIG. 3) depending from each bracket 22 and engaged with the front surface of the rail 2. A press roller 26 is elastically engaged with the rear surface of the rail 2 and is disposed between the side rollers 24 and 24, and its support structure is as follows.

Mainly, in addition to Fig. 3, Fig. 5 is also used, and 27 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 joint constructed at the tip of this arm. 30 is a swing shaft that hangs down from the arm 28 to the lower part of the upper plate 21a via this ball joint. The press row 526 is pressed against the rail 2 by applying the force forward. Reference numeral 32 denotes a bar for releasing this engagement, and as shown in FIG. It faces the front side. Also, in this figure 4, 34
is an operation lever whose middle part is supported by a stud 35 projecting downward from the upper plate 21a, and whose rear end is bent as shown in FIG. 3 so that this bent part approaches the front side of the bar 32. It is. Therefore, when the operating lever 34 is rotated counterclockwise in FIG. 4, the swing shaft 30 is rotated rearward via the bar 32, and 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 a cup fixed to this output shaft. The ring 43 is a drive roller fastened to this coupling. The drive roller consists of a hub 43a and a tire 43b made of an elastic material such as rubber, which is arranged between the side rollers 24 and 24 and is pressed against the front surface of the rail 2 with an appropriate elastic force as shown in FIG. engage.

As is clear from the above configuration, since the center of gravity of the carrier 20 is located in front of the traveling wheel 23, the carrier tends to tilt forward. Mainly 50 in Figure 3
．． Reference numeral 50 denotes an attitude holding means for suppressing this tilting and keeping the above-mentioned engagement attitude of the carrier 20 constant. In these means, reference numeral 51 denotes a holding roller whose peripheral portion is formed of a tire 51a made of an elastic material such as rubber.
25 via sleeves 52 and 52, and is engaged with the front surfaces of four rows of liquid roots to suppress the above-mentioned tilting, as shown in FIG. 53 is a weight that also serves as a handle, and is attached to the upper plate 21 at the rear of the traveling wheel 23.
a, thereby adjusting the position of the center of gravity of the carrier 20 to prevent a large bending load from being applied from the holding roller 51 to the liquid root 4.

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. Reference numeral 64 denotes a clamper that holds the holder 62, and this clamper is attached to the side plate 21 of the carrier base via an L-shaped bracket 65.
b, and in this state, the tip of the pitot tube 61, that is, the flow velocity detection part 61a, is placed facing into the air guide groove 6 and facing upstream of the jet air flow (FIG. 3).

3 and 7, 70 is a position detector for detecting the traveling position of the carrier 20. In FIG. The detector 70
, 71 is a light emitting/receiving coaxial type optical fiber, and this optical fiber is housed in a sleeve 72 and clamped by a clamper 73, and this clamper is fixed to the side plate 21b of the carrier base 21 via an L-shaped bracket 74. The light emitting/receiving section 71a at the tip of the optical fiber 71 is disposed at a position that can face the auxiliary nozzle 9, and is also disposed in the same line as the flow velocity detecting section 61a of the pitot tube, as shown in FIG. Thereby, when the flow velocity detection section 61a passes the auxiliary nozzle 9, the position detector 70 can detect the presence of the nozzle 9 based on the change in the amount of received light. The embodiment is as described above, so when the traveling wheels 23, 23 are placed on the rail 2 and the operating lever 34 is operated to press the press roller 26 against the rail, the carrier 20 is brought into contact with these wheels and rollers. It engages with the rail 2 via the side rollers 24.24, and this engaged position is maintained by the holding rollers 51.51. Here, when the reversible geared motor 41 is started and the drive roller 43 is rotated forward or reverse, the carrier 2
0 travels in a desired direction in the weft insertion direction, and the detection part 61a of the Pitot tube type flow velocity detector carried by this carrier is held at a predetermined position in the cross section of the air guide groove 6 and moves to measure the air flow velocity at the face part. Detect. Then, the flow velocity detection section 63 converts this detected flow velocity value into a voltage and outputs it.

Further, the position detector 70 also moves along with the carrier, and each time the light emitting/receiving section 71a of the optical fiber passes the auxiliary nozzle 9, the detector 70 detects the presence of the nozzle 9 based on the change in the amount of received light. The running speed of the carrier 20 is 80C/min.
It is experimentally appropriate to set it to about Im.

FIG. 8 shows the output and position detection 57 of the flow velocity detection section 63.
This shows an example of a recording device that records a 0 signal.

In this recording device 90, reference numeral 91 amplifies the electrical quantity signal of the flow velocity detection section 63 in the flow velocity detector 60, and 92 indicates an optical fiber 7 in the position detector 70.
a converter for converting the change in the amount of received light of 1 into a change in electricity;
3 is an amplifier for amplifying this electrical change, and 94 is an analog recorder for recording the outputs of these amplifiers 91 and 93.

FIG. 9 shows an example of the record of the recorder 94.
The vertical axis indicates the value obtained by converting the flow velocity into head pressure, and the arrow indicates the downstream side (opposite the weft entry side) of the jet air flow, and the carrier 20 was run in the direction of the arrow. (2) indicates the output of the amplifier 91, that is, a flow velocity curve showing changes in flow velocity, and Pl to pn indicate the output of the amplifier 93, that is, the location of the auxiliary nozzle 9, or the position on the movement path of the flow velocity detection unit 61a. It is a position mark.

FIG. 10 shows another embodiment of the flow rate detector, and this flow rate detector 80 includes a plurality of pitot tubes 80, nine in this example.
1 is placed in the cannula 82 and clamped by the clamper 83, and in this state, the flow velocity detection part 81a at the tip of each pitot tube is arranged flush within the air guide path 6, and at the other end of each pitot tube, each ultra-small A connector/flow velocity detection section 84 incorporating a flow velocity/voltage conversion element is connected thereto.

According to this embodiment, the flow velocity distribution within one cross section of the air guide groove 6 can be grasped.

[Effect] 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 in correlation with the auxiliary nozzle, so the analysis results can be used as effective design data. In addition, spray conditions and the like can be appropriately and easily set for improving weaving.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram 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 partial end view from II in Figure 1, Figure 3 is a partial cross-sectional side view from Figure 2 at ■, Figure 4 is a bottom view from Figure 3 at V, and Figure 5 is a partial cross-sectional side view from Figure 2. vg
3 is a sectional view taken along the line v-v in FIG. 3, FIG. 6 is a sectional view taken along the line ■-■ in FIG. 3, FIG. 7 is a sectional view taken along the i-w line in FIG. FIG. 9 is a block diagram of a recording device for recording data known from the device, FIG. 9 is a graph illustrating the recording obtained with the device of FIG. 8, and FIG. 10 is an end view of main parts showing another embodiment. 1... Limbs 2... Rail (upper frame of the reed)
4... Liquid root 5... Four places 6... Air guide groove 9... Auxiliary nozzle 10... Flow velocity distribution detection device 20... Carrier 23, 24, 26... As engagement means Traveling foil side roller breath roller 40... Traveling drive means 50... Posture holding means 51
... Holding roller 53 ... Weight 60.80 ...
・Flow velocity detector 61.81... Pitot tubes 61a, 81a... Flow velocity detection section 70... Position detector Patent applicant Nissan Motor Co., Ltd. Fig. 5 "j Fig. 6-i Fig. 7 Fig. 8 Seki

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. A rail that extends in the weft direction, a carrier that can travel while engaging with the rail, an attitude holding means that maintains the engagement attitude of the carrier constant, and a flow velocity detector and an auxiliary nozzle carried on the carrier. 1. A flow velocity distribution detection device for an air jet loom in an air jet loom, comprising: a position detector for detecting the position of the flow velocity detector;