JPS58214565A - Weft yarn receiving and inspecting apparatus - 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 The present invention relates to a weft receiving and scenting device for a needle loom, which inserts the weft using air.

The device includes a first weft detector and a second weft detector mounted on the batten on the opposite side of the loom from the weft insertion nozzle. It is clear that in a loom of the type in question, when a length of weft thread or "pick" is inserted, it is necessary to be able to detect defective picks by keeping the regular picks taut with the beating. be.

To perform the first of these functions, it is known in the art to hold the end of the pick by means of a suction device which in some cases deflects the thread from its wefting axis (French Painting Patent No. 2). , 488, 293).

The second function, namely the inspection of the weft yarn in its receiving area, is essentially a photoelectric device that inspects the weft after wefting, so that the loom can be stopped in case there is no pick end in place. Automatically checks for the presence of a pick end.The absence of a pick end means that the length of the pick is too short, making it difficult to measure the length, or that the adjustment is inaccurate, i.e. during wefting. This occurs when the weft yarn becomes tangled and breaks.Generally, the weft yarn detector is 1
It is also well known to use two weft thread detectors instead of one. In this case it is also possible to stop the loom when defects of this kind occur (French Painting Patent No. 2,184).
, 356 and Belgian Patent No. 891,217). However, with the structures known to date, the operation of such devices is unsatisfactory due to twofold inadequacies. Firstly, the end of the pick which is too long is not accurately guided towards the second detector. Secondly, the passage of the thread in front of this second detector during the beating movement of the batten is not accurately checked. If in practice a part corresponding to the normal length of the pick is supported by the lower opening of the warp and the low selvedge strands of the fabric, then the withdrawal of this part of the pick from the reed and its passage in front of the first detector. Because of this, no active device is provided to similarly hold the overly long end of the pick, which must be detected by the second detector.

The invention provides a device for the reception and inspection of weft threads which is capable of detecting all defects of this kind, in particular by ensuring that the second detection always takes place accurately. Excludes obstacles.

For this purpose, the present invention provides that a weft suction device is disposed downstream of a first weft yarn detector and upstream of a second weft yarn detector along substantially the weft insertion axis of the weft yarn that is taken to the batten, and that the suction device The present invention relates to a weft yarn acceptance inspection device as described above, in which the end of an excessively long pick is presented to a second detector to ensure that said pick is used during the beating movement of said batten.

That is, the suction device holds the end of the pick and acts precisely along the wetting axis. In this way, in the case of an excessively long pick, the end of this pick can be presented precisely to the second detector.

In one embodiment, the weft yarn acceptance inspection device according to the invention also comprises:
A fixed pull-out finger is provided which extends perpendicularly to the weft insertion axis and is located between the weft thread suction device and the second weft thread detector. This drawer finger is fixed to the frame of the loom. During the beating movement, this fixed pull-out finger brings an excessively long pink in front of the second detector. This drawer finger preferably has its upper edge located approximately at the same level as the lower shed of the weft thread. The pull-out finger then ensures the pull-out of the pick and its passage in front of the first weft thread detector. This acceptance (with regard to the cooperation of each part of the moxibustion device,
The function of the drawer fingers is pneumatic rather than purely mechanical. This finger piece forms a partial obstruction to the air jet exiting the suction device so as to deflect the air jet and assist the flotation force of the thread for passage of the thread in front of the second detector. Make any other pieces that support the thread past the detector redundant.

All device parts other than the fixed drawer fingers, namely the first weft thread detector, the weft thread suction device and the second weft thread detector, are
Advantageously, the same support placed at the end of the batten opposite to the side of the transverse nozzle can be accessed. If an intermediate so-called relay nozzle supported on the batten is used for the pneumatic weft insertion of the weft yarn, said support also supports an additional relay nozzle located upstream of the first weft yarn detector, which is attached to this support. Ensures injection of the end of the pick towards the subsequent piece. This support also supports a pattern extending the teeth of the reab, in particular to form a crosslight slot between the first detector and the weft suction device.

According to one embodiment of the invention, this weft thread suction device has an internal annular chamber supplied with air by at least one eccentric air inlet so as to obtain a rotational movement of air which maintains the twist of the end of the pick. It has a main body. The main body of the suction device has two air inlets with opposite eccentric distances, so that the same suction device is suitable for S weft and Z weft yarn, so as to obtain two air rotation directions. It is better to be able to do so. each.

The air intake can be connected to the air intake of its used reservoir or blocked if this air inlet is left unused. This weft thread suction device has its main body extending in the direction of the second weft thread detector by means of a tube section which delimits a central slot. The annular chamber communicates with the pit hole by a conical passage. This conical passage makes it possible to accelerate the rotational movement of the air in proportion to the reduction in diameter, according to the principle of conserving kinetic energy. The action of the weft suction device is permanent or continuous. However, successive solutions only allow for small air savings.

The above-described weft thread acceptance inspection device can also recognize normal picks, too short picks, too long picks or weft thread breaks.

That is, when the pick is normal, its end is stopped between the first detector and the second detector at the level of the suction device. During punching, such a pick is characterized in that it is present at the level of the first detector and not at the level of the second detector.

If the pick is too short, its end will not reach the first detector. During punching, such a defective pick is characterized in that it is not present at the level of two detectors simultaneously.

If the pick is too long, its end leaves the suction device and reaches the second detector. During punching, such a defective pick is characterized in that it is present simultaneously at the level of two detectors.

If the weft thread breaks, the separated fragments may not be completely released and may be present at the level of the two detectors when the test is performed. That is, each detector stops the loom in the same way as if these detectors picked too long picks.

When the inspection is carried out in the event of a break in the weft thread, the detached fragments may be partially ejected and present only at the level of the second detector. The first detector detects the absence of a weft thread, while the second detector detects the presence of a weft thread. This is characterized by such defects.

If the weft thread breaks, the separated fragments will eventually be completely released. This case is similar to the case of too short a pick. If there is no yarn detected as errr+ at the level of the two detectors, the loom is similarly stopped.

As is clear from the foregoing, if there is a thread blown out at the level of the second detector, it is determined that there is a defect that requires the loom to be stopped. This device thus suffers from not distinguishing between picks that are too long or broken, defects that effectively require a stoppage of the loom, and the presence of very short pieces of weft thread or loose threads. In these cases,
If a weft thread fragment or a waste thread passes in front of the second detector during the inspection window, an unnecessary machine stoppage occurs.

This unintentional stopping of the loom can be prevented by providing the second weft thread detector with two sets of detection device parts, in particular optoelectronic mounting parts, located in the same plane approximately perpendicular to the weft thread path. The function of the second detector part is to confirm the presence of the object to be detected by the first detector part after a short delay.

An electronic circuit associated with the second weft thread detector is adapted to identify commands and discrepancies in the signals coming from the two sets of detector components of this detector and to control the stopping of the loom. That is, by positioning the two sets of detector parts in a plane orthogonal to the weft thread path, a pick held too long will float successively past the two sets of detector parts.

In this case, two signals are generated one after the other in a determined order. These signals control the stopping of the loom.

Very small loose fragments of relatively small size weft or waste threads that are ejected at very high rates are identified by only one of the two sets of detector parts.

In this case the electronic circuit does not cause the loom to stop.

A relatively large amount of loose threads, i.e. loose threads of dimensions at least equal to the spacing of the two sets of detector parts, can be seen by the two sets of detector parts, which in this case provide approximately simultaneous signals. If the electronic circuit does not recognize the prescribed order of successive signals and their minimal discrepancy, it will not stop the loom.

A variant of the device which can eliminate the same obstacle is to provide a third weft thread detector located downstream of the second weft thread detector in the same arrangement on approximately the same axis.

An electronic circuit cooperating with the structure formed by the second and third detectors ensures quasi-synchronization of the signals coming from these two detectors and controls the stopping of the loom. This stop occurs when a piece of weft thread passes near two detectors at the same time.

Hereinafter, an embodiment of the weft yarn acceptance inspection device of the present invention will be described in detail with reference to an accompanying drawing.

As shown in Figures 1, 2, 3 and 4, the batten (2) is inspected at the rear of the weft receiving inspection device M (11 indicates most of its parts). That's it. As is well known, the axis line (51
a confinement piece (41) formed by teeth dividing a slot along which the weft thread passed through, and a series of relay nozzles (6) acting as weft insertion nozzles for sending a jet of air into said slot (9); We are collaborating with

The support (7) of the device (1) of the present invention, which is fixed to the end of the norutsu ten (2) that is far from the horizontal insertion nozzle (6), is pick-picked onto each of the following pieces attached to the support (7). supports an additional relay nozzle (81) for reliably injecting the end of the weft thread; 1).

Between the first weft detector (9) and the inlet of the suction device (10) the support (7) also has a series of teeth 0 which are divided into two groups at the top.
Supports 2.

Each tooth .alpha. extends the length 4) so that each group of strands can be brought together so as to pass the weft thread through the slot and retain the lint or selvedge thread.

In addition to the parts attached to the support (7), the device has two parts perpendicular to the weft axis (5), the outlet of the suction device (10) and the
A drawer finger piece 03) located between the weft thread detector OD and the weft thread detector OD is provided. The finger piece (13) is fixed to the frame α→ of the loom.

The weft suction device (lO), which is illustrated in more detail in FIGS. 5 and 6, has a cylindrical body (19
I am prepared. The main body 0e has two joints (18) facing each other so as to admit air into the annular chamber (19) connected to the central slot (21) by a conical passage 120). The axis of each joint (47+, (18)) is eccentric by an amount e, inducing a rotational movement of the air in one direction or the other depending on the joint used.The suction device (10) is connected to the support (7). It is attached to part (7a). Part (
7a) allows the suction device +10+' to be fixed in the desired angular position. The fitting (17) or fitting (
I8) is connected to the air pipe line (22), but the other joint, which is not in use, is blocked by a stopper post (2).

As is clear from FIG. 7, each weft thread detector (9) (formerly) has a pedestal (24) for fixing it to the support (7) and two arm pieces to form a recess (26). and a dividing head (25). The outline of the depression (26) approximately corresponds to the outline of the rice cake partitioned by the rice bowl 4) and each tooth θ. One arm of the head (25) is a light source (27)
', while the other arm supports the photovoltaic cell (28)'.

The light source (27) and the photovoltaic cell (28) constitute a light barrier located in the free passage between the recess (26) and the outside.

During operation of the loom, the end of each weft pick, reaching from the opposite side of the weft nozzle (6), is usually connected to a first detector (9) before being sucked and kept under tension by a suction device (1α).
and 0 each tooth. Air conical passage 120)
The suction device (
10) The S-twist or Z-twist of the weft is maintained at the same time by the rotation of the air inside.

The first weft thread detector (9) detects if a pick that is too short does not reach the detector (9) at the end of weft insertion, or if the pick breaks and a piece of weft thread gets stuck in the detector (9). Stop the loom if it enters without moving. The detector (9) intervenes when the batten (2) has pivoted about its axis of rotation (29) by an angle consisting of the position shown in FIG.

In this position shown in FIG. 3, the weft insertion axis +51 U is located above the lower shed (30) of the warp threads.

In practice, as shown in Figure 4, the lower shed (30) extended by the threads of the low selvedge strands is previously At the same time, lower the horizontally inserted pick 4) to the tooth αa.
This pick is withdrawn by disassociating it from the first weft thread detector (9). In particular, as shown in Figure 7, the thread present at the level of the detector (9) is
It is pulled out from the recess (26) through a passage provided between the two arm pieces. And the existence of this thread means that this thread is the light source (27)
It is detected when passing through a light barrier formed by a photovoltaic cell (28).

In case of an abnormally long pick, the suction device (10)
From the horizontal position shown in the figure, the batten (2) is aligned with its axis of rotation (
When pivoting to the knitting machine of 29), the end of the pick is presented to the second weft thread detector (old). The upper edge of the finger piece 03) located approximately at the same level as the lower shed (30) of the warp threads has the same draw-out function as the shed (30) for the end of the pick located in front of the suction device (10). fulfill. This end is thus released from the hole of the second weft detector (formerly), and this end is connected to the light source (27) of the detector (11) and the photocell (2).
8) is detected when passing between In this case, the spinning machine stops.

As shown in FIG. 8, the head (25') of the second weft thread detector (ii') has two sets of separate detection devices located in the free passage between the kuhomi (26) and the outside. Parts (27)-
(28) and two light sources (27), (27') and two photovoltaic cells (27') and parts (27')-(28').
28), (285). The two silk detector parts are located in the same plane perpendicular to the weft axis (5). With this construction, stopping of the loom is effectively caused by picks that are too long. However, in other cases, the stop does not occur and the distinction is made as shown in Figure 9, Figure 1O, Figure 11, Figure 12, Figure 14, Figure 15, Small Figure 16, and Figure 17. First, as shown in FIG. 9, a pure pick that is too long during the passage of the air jet generated in the direction of the arrow (31) by the phased movement of the drawer finger (13) is detected by the first detection device. It sequentially passes in front of the component, namely light # (27) and photocell (28), and in front of the second detection device component, namely the light source (27') and photocell (28').The first device component (27), (28) produces a detection signal S, followed by a second device part (27'), (28') which produces a detection signal S'.
will occur. The presence of two signals s, s' which follow each other in a fixed order with a discrepancy d-i with respect to time, as shown in FIG. 10, is thus characteristic of a pick that is too long and stops the loom.

High speed without being held (50 to 100r+1/
'5ec), showing a small fragment of the weft moving at the
In the case shown in the figure, this one piece is the first detection device part (2
For 7 people (28)! 11 tJ was observed, or this fragment was recognized by the PO2 detector parts (27'), (28',). However, the same fragment cannot pass in front of two sets of device parts.

That is, a single signal S coming from a device component (27 people (28)
(Figure 12A) or device parts (27'), (28')
A single signal S' (FIG. 12B) is obtained coming from . In any case, in this case, the two consecutive signals cannot be confirmed and the loom does not stop.

Figure 13 shows two sets of detection device parts (27 people (28 people (2
7'), (28'), some waste material (33)' large enough to be occasionally recognized at the same time.
It is shown as e. In other words, parts (27), (28) and part (27' input (2B') each receive a signal S%S' indicating the presence
k occurs. However, these signals do not follow each other in a constant order with minimal discrepancy, as shown in FIG. Therefore, loom 1' does not stop.

Finally, as shown in FIGS. 15 and 16, a relatively long weft thread segment (34) (length 5 to LOot+) is connected to two sets of machine parts (27) in front of which the segment (34) passes successively.
, (28), etc., produce discrepant signals s, s''' (FIG. 17), as in the case of too long bicks.

In this way, a stoppage of the loom occurs. This stop is a fragment (
34) is valid because it reliably corresponds to fabric defects according to the lack of weft threads in the fabric.

FIG. 18 shows an example of an electronic circuit having two sets of detector parts, marked as detector (U'), which can control the stopping of the loom only when absolutely necessary, as described above. This circuit 11 (i) receives on one hand the signal S coming from the first detector component, pre-shapes this signal, and receives on the other hand a signal F' corresponding to the "window j" that justifies the input trap check; a first AND gate (35) and (11) a time delay signal generator (3) connected to the output of the AND gate (35);
6), (111) a monostable circuit (37) connected to the output of the time-delayed signal generator (36) and creating a test window F' for the second detector component; circuit(
A second ANI) gate (3B) connected to the output of the ANI) gate (3B) whose other input receives the signal S' coming from the second detector component after shaping;
8), the other input of which receives the positioning stop signal W.

The diagram of FIG. 19 illustrates the operation of the circuit of FIG. 19th
In the figure, T represents the signal generated by AND (35). T' represents the signal available at the output of the time-delayed signal generator (36) resulting in the discrepancy Δt'l.

V represents the signal generated by ANI) (38,).

In this case, the signal S' coming from the second device part is assumed to be located within the window F'.
(39) of course does not generate a stop command.

Next, FIG. 20 shows the apparatus of the present invention. In this device, the second weft detector 0υ is a single detector component (27, 1, (28
,), but the detection device parts (21')
, (28'/) a third weft thread detector (11//).
) followed by The second detector [111 and the second detector (11//) are located on substantially the same axis and in the same arrangement. Each detector produces a respective presence signal S, S''k. Only after approximately synchronizing each signal S, S' is sent to the electronic circuit (40) which controls the stoppage of the loom. In this case, too long picks and wefts A distinction can be made between small fragments of

Although the present invention has been described in detail with respect to its embodiments, it is of course possible to make various changes and modifications to the present invention without departing from its spirit.

[Brief explanation of the drawing]

Fig. 1 is a diagram 111 of an embodiment of the weft receiving transverse distortion device of the present invention installed in a batten of a loom, Fig. 2 is a plan view of Fig. 1, and Figs. 3 and 4 are the same as Fig. 1. 1 is a side view showing the device in a weft insertion position and a weft withdrawal position, respectively; FIG. FIG. 5 is an enlarged side view of the weft suction device of the apparatus shown in FIG. 1, and FIG. 6 is a front view showing the upper half of FIG. 5 in axial section. FIG. 7 is an enlarged side view of one of the weft thread detectors of the apparatus of FIG. 1, and FIG. 8 is a partial side view of a second detector provided with two sets of detector parts of the Shimafuzu Ω apparatus. Figure 9, Figure 1O, Figure 11, Figure 12, Figure 13, Figure 14, Figure 15, Figure 16 and Figure 17 show the operation of the weft thread detector in Figure 8. FIG. 18th
The figure is a block diagram of an electronic circuit that cooperates with the detector in Figure 8.
FIG. 19 is a diagram showing the operation of the electronic circuit of FIG. 18, and FIG. 20 is a diagrammatic front view of the apparatus of the present invention equipped with a third weft thread detector. 1... Weft receiving horizontal lid device, 2... Batten, 5
...Horizontal insertion axis, 6...Horizontal insertion nozzle, 9...
First weft detector, 10... suction device, 11.11'
...Second weft detector ria, 1

Claims (1)

[Scope of Claims] A yarn loom for wefting the weft yarn by air, which comprises a first weft detector and a second weft detector attached to the batten on the opposite side of the weft insertion nozzle. Ta,
In a weft yarn acceptance inspection device for a Hinoki loom, a weft suction device is attached to the batten and arranged approximately along the weft insertion axis of the weft yarn on the downstream side of a first weft yarn detector and on the upstream side of a second weft yarn detector, and the suction device A weft yarn acceptance inspection device characterized in that the end of the pink yarn which is too long is presented to the second detector so that the pink yarn is reliably detected during the beating movement of the batten. (2) A fixed drawer finger extending perpendicular to the weft insertion axis and positioned between the weft suction device and the second weft detector is also provided, and the drawer finger is fixed to the frame of the loom. An acceptance inspection device according to claim (1). (31) the upper edge of the fixed drawer finger is positioned approximately at the same level as the lower shed of the warp threads when said lower shed ensures the withdrawal of the pick and its passage in front of the first weft thread detector. Claim No. 2 (2) characterized in that
) Acceptance inspection equipment described in section 2. (41) The first weft thread detector, the weft thread suction device, and the second weft thread detector are all mounted on the same support fixed to the end of the batten remote from the weft insertion nozzle. The acceptance inspection device according to any one of the ranges (1) to (31). Claim 4, characterized in that the extension supports teeth located particularly between the first weft thread detector and the weft thread suction device.
The acceptance inspection device described in item 1. (6) A patent claim characterized in that the weft suction device is provided with a body having an annular internal chamber supplied with air by at least one eccentric air inlet so as to obtain a rotational movement of the air. The acceptance inspection device according to any one of items (1) to (5). (71) Claim (6) characterized in that the main body of the suction device is provided with two air inlets having opposite eccentric distances so as to obtain two rotational directions of air. (8) The main body of the weft thread suction device is extended in the direction of the second weft thread detector by a tube section partitioning a central slot, and the annular chamber is connected to the slot by a conical passage. The acceptance inspection device according to claim 6 or 71, characterized in that: There are 2
The acceptance inspection device according to any one of claims (1) to (81), characterized in that a set of unloading device parts is provided. (10) An electronic device that cooperates with the second weft yarn detector Acceptance inspection according to claim 9, characterized in that a circuit ensures the order and proper discrepancy of the signals coming from the two sets of equipment parts of the detector to control the stopping of the loom. Apparatus. ■) Patent No. 1iii8+1jilJ (paragraphs 11 to 11) characterized in that a third weft thread detector is provided downstream of the second weft thread detector and located on substantially the same axis and in the same arrangement. The acceptance inspection device according to any one of clauses (8). αa "The electronic circuit cooperating with the structure formed by the second detector and the third detector allows the signals coming from said two detectors to be synchronized" 111. The acceptance inspection device according to claim 111, wherein the acceptance inspection device is completely reliable and controls stopping of the loom.