JPH02175952A - Weft-length measuring apparatus for fragment loom - Google Patents

Abstract

PURPOSE:To carry out the length-measuring operation without applying load on the ejection through a nozzle and to prevent the defective weft-insertion by using a guide member clamping a weft synchronous to the nozzle ejection, moving the guide member to a length-measuring position, clamping said weft between a pair of feed rollers and introducing the weft into the nozzle while measuring the length of the weft. CONSTITUTION:A driving motor 17 is energized synchronous to the ejection timing of a fluid nozzle 13 to rotate a pair of feed rollers 16 in the direction of the arrows. At the same time, a solenoid 22 is actuated and a weft 8 is clamped between the above feed roller pair 18 by shifting a weft-holding guide member 10 from the wait position shown by the dotted line to the length- measuring position. The weft 8 is unreeled from a bobbin 15 during the period clamped with the feed roller pair 16 and ejected through the ejection nozzle 13 toward the opening part of warp. The motion of the guide member 19 is controlled in such a manner as to position at the length-measuring position in the flying stage of the weft and at the wait position in the non-flying stage of the weft.

Description

[Detailed description of the invention] <’A business field of use) The present invention relates to a weft sub-length device in a piece loom.

(Prior Art) In a fragmentary loom, a weft fed into a warp opening is measured and cut. In FIG. 8, the warp threads 2 wound around the yarn beam 1 are passed through the opening 7 between the guide rollers 3 and 4 by belt frames 5 and 6 (only two are shown).
is formed. The weft yarn 8 is inserted into this opening.

The inserted weft yarn is then driven in by the reed 9. The woven fabric formed by weft insertion is wound up on a winding roller 10. The reed 9 is swingable between a retracted position shown by a solid line and a driven position shown by a chain line, and is swung by receiving power from a drive source 11 via a crank mechanism or a cam mechanism. As shown in FIG. 9, the length of the weft thread 8 is measured by a length measuring machine 12, and then passed through a fluid nozzle, for example, a water jet nozzle 13.
It is made to fly to the opening of the warp threads. When the weft yarn is driven in by the reed, the weft yarn is cut by the cutter 14.

As length measuring machines, several methods have been proposed and put into practical use, such as a drum length measuring method and a pool pipe length measuring method. In the drum length measuring method, the length of the weft to be inserted is set by winding the weft, which is easily unwound and wound around the bobbin of the weft supply mechanism, by a predetermined length onto a length measuring drum having a tapered peripheral surface. The pool pipe length measurement method measures the length of a weft thread wound around a bobbin by pulling it into the pipe using a vacuum.

(Problem M to be Solved by the Invention) The drum length measuring method described above uses a baffle plate to restrict the so-called ballooning phenomenon in which the weft yarn unwound from the length measuring drum spreads in the radial direction when the weft yarn is made to fly with a jet nozzle. Therefore, there is a problem in that the friction between the baffle plate and the weft puts a large load on the jet nozzle. This problem causes the weft to fly incompletely, leading to a high load on the jet nozzle and the pump system that drives it. In addition, with the above-mentioned pool pipe length measurement method, the vacuum pressure during length measurement becomes a load on the jet nozzle, so the flight ability must be significantly increased, and the increased capacity of the pump system causes heavy snowfall and noise. There is a problem with getting bigger.

The purpose of the present invention is to provide a weft length measuring device for a fragmentary loom that can measure length without particularly improving the flight ability of the nozzle and without causing heavy snowfall on the device, and a weft yarn length measuring device that prevents excessive tension from occurring on the weft during length measurement. The purpose of the present invention is to provide a weft length measuring device that does not.

(Means for Solving the Problems) The length measuring device of the present invention is disposed on the weft passage between the fluid nozzle and the weft supply mechanism, and is rotationally driven in the weft conveying direction at least during weft side length. The feed roller pair is engaged with the weft thread pulled out from the weft supply mechanism,
A weft yarn provided movably between a side length position where the weft yarn is held between the pair of feed rollers and sent toward the fluid nozzle, and a standby position where the engaged weft yarn is separated from the pair of feed rollers. a guide member, a guide member moving means for moving the weft guide member to the side length position when the weft is flying, and positioning the weft guide member to the standby position when the weft is not flying; and a control device for controlling the operation of the guide member moving means so as to selectively position the guide member on either side, and the feed roller pair is composed of a pair of tapered rollers, and the weft thread The device is characterized in that the standby position of the guide member is beside the small diameter part of the tapered roller, and when the weft is on the weft side, the weft is moved from the small diameter part of the roller to the large diameter part.

(Function) When the weft opening is formed and the timing for weft flight is reached, the control device operates the guide member moving means to move the weft guide member to the side length position and engage it. The weft yarn is held between rotating feed rollers, and the weft yarn is let out from the weft supply mechanism by the rollers. The weft thread is fed toward the nozzle while being held between a pair of feed rollers, and when a predetermined length of weft thread is sent out, the control device operates the guide member moving means to move the weft thread guide member to the standby position and perform measurement. end the length. The drawn-out weft yarn is inserted into the warp opening by a fluid nozzle. When the weft yarn is driven in by the reed, the cutter is activated to cut the weft yarn.

(Example) Hereinafter, the present invention will be described in detail based on the illustrated example. In FIG. 1, a weft passage between a fluid nozzle 13 and a bobbin 15 serving as a weft supply mechanism includes a roller 16a made of an elastic material such as rubber, and a roller 16a that has been subjected to a surface treatment such as alumite treatment or chrome plating. A pair of feed rollers 16 including rollers 16b made of a hard material having a circumferential surface is provided. This feed roller pair 16 is connected to the drive motor 1
7, it is rotationally driven in the weft conveying direction shown by the arrow. The drive motor 17 is operated by a drive signal output from the control device 18 of the JA machine main body, and may rotate the feed roller at all times, or may rotate the roller pair only during length measurement operation, which will be described later. . For the example shown.

The roller 16b is a driving roller, and the roller 16a is pressed against it and rotates as a result. As shown in FIG. 2, the outer peripheral edge of the end surface of each roller is chamfered, and the nip portion 16c
This makes it easy for the weft thread 8 to enter. A weft drawn from a pirn, a cone, etc. is wound around the bobbin 15 so that it can be easily unwound.

Between the bobbin 15 and the pair of feed rollers 16 is a weft guide member 1, which has the weft thread 8 passed through the guide portion 19a at the lower end thereof.
9 are arranged. As shown in FIG. 2, the weft guide member 19 is provided to be swingable about a pivot shaft 20. A spring 2 is attached to the other end of the weft guide member 19.
1 is applied, giving the guide portion 19a of the member a tendency to swing to the standby position shown by the chain line. As shown in FIG. 2, a movable portion of a solenoid 22 is connected to the other end of the weft guide member 19. Solenoid 22
is operated in synchronization with a weft flight signal from the control device 18, and is turned on and off by a solenoid drive circuit (not shown). When the solenoid 22 is turned on during weft side length.

The weft thread guide member 19 is swung to a longitudinal position in which the weft thread 8 engaged therewith is positioned in the nip portion of the pair of feed rollers 16, as shown by the solid line in FIG.

The operation of the embodiment configured as above will be explained. 7th
The figure shows the timing of weft insertion and driving.
When the drive source 11 of the machine body is turned on, the main shaft 11a
(see FIG. 8) is constantly rotated, causing the reed 9 to swing. The reed 9 has one driving position (for example, 65°, 425°, 78° in terms of the main shaft angle) in one rotation of the main shaft 11a.
5° position). As the main shaft rotates, the warp yarns alternate between upper and lower yarns to form an opening 7.

The nozzle 13 is turned on when the warp threads 2 form an opening, and starts spraying to make the weft threads 8 fly. Simultaneously with or prior to this timing, the drive motor 17 is turned on to rotate the feed roller pair 16 in the direction indicated by the arrow. At this time, the solenoid 22 is turned on to move the weft guide member 19 from the chain line position to the solid line position in FIG. ! ! (In FIG. 3, it is swung from the solid line position to the broken line position).

When the weft guide member 19 is moved to the side length position, the weft 8 engaged therewith is conveyed toward the nozzle 13 while being held by a pair of feed rollers 16 rotating in the weft conveyance direction. The weft yarn 8, which is conveyed while being pinched by the pair of feed rollers 16, is transferred to the bobbin 1 only while being pinched by the pair of rollers.
It is unrolled from 5. This unwound weft yarn 8 is caused to fly toward the opening 7 (see FIG. 4) by the nozzle 13 that has started jetting. The length measuring operation by the weft guide member 19 is temporarily stopped when the solenoid 22 is turned off and the weft guide member moves to the standby position indicated by chain m (see FIG. 2).

When the weft thread guide member 19 is moved to the standby position, the weft thread 8 is separated from the feed roller pair 16 and released from the feeding action thereof, as shown in FIG. The length measuring operation, that is, the operation of moving the weft yarn guide member 19 to the side length position to sandwich the weft yarn 8 between the pair of feed rollers 16, is stopped at the same time as or slightly before the nozzle 13 stops spraying. After the reed 9 drives the weft fed into the opening 7, the cutter 14 (see FIG. 8) is operated at an appropriate timing to cut the weft 8.
cut.

Thereafter, the weft guide member 19 is moved to the side length position in synchronization with the rotation of the main shaft, that is, the timing of weft flight, and causes the weft to be held between the pair of rotationally driven feed rollers 16. Here, the timing at which the nozzle 13 starts jetting and the solenoid 22 is turned on will be explained in a little more detail. If the solenoid 22 is turned on earlier than the nozzle starts jetting, the feed roller pair 16 will immediately start feeding the yarn, and there is a risk that the weft yarn will become loose between the roller pair 16 and the nozzle 13. Therefore, turning on the solenoid 22 is
At the same time as the start of jetting from the nozzle 13, or a little later than this.

The measured length of the weft yarn is determined by controlling the rotation angle of the feed roller pair 16 and the energizing time of the solenoid 22, that is, the number of rotations of the roller 16b, according to the length of the weft yarn that corresponds to the width of the woven fabric. , is set appropriately.

It goes without saying that weft clippers may be provided before and after the feed roller pair 16 in the weft passage between the bobbin 15 and the nozzle 13. Although a ballooning phenomenon occurs in the weft yarn between the clipper and the bobbin 15, this phenomenon does not become a load on the nozzle 13 because the weft yarn is forcibly conveyed by the pair of feed rollers 16.

Now, when the weft yarn guide member 19 is moved to the side length position, the feeding speed of the weft yarn 8 by the feed roller pair 16 shown in FIG. 2 suddenly rises as shown by the broken line in FIG. ing. Therefore, a relatively large impact is applied to the weft yarn 8 that is unwound from the bobbin 15. This phenomenon causes problems such as yarn breakage depending on the type of weft yarn.

An embodiment that can solve this problem will be described. In this embodiment, the structure of the pair of feed rollers 16 is devised.

In FIG. 4, a pair of feed rollers 16A disposed in the weft path between the bobbin 15 and the nozzle 13 includes a driving roller 16Ab and a driven roller 16 each consisting of a tapered roller.
It consists of Aa. And weft guide member 19A
In this case, the small diameter side of the taper roller is set as the standby position (see the chain line position), and the solenoid 22 is activated at the timing of the weft flight.
When turned on, it is moved to the side length position shown by the solid line. Since the feed roller pair is composed of tapered rollers, the weft conveyance speed during length measurement rises gradually as shown by the solid line in FIG. This effect will be explained based on FIG. 5. When the guide portion 19Aa of the weft guide member is placed in the standby position, the weft 8 is located away from the pair of feed rollers. In response to a signal to start weft flight, the solenoid 22 is turned on and the weft guide member, which has been placed at the chain line position in FIG. 4, moves toward the side length position shown by the solid line. As shown by 8a → 8b → 8c, the nipping part of the roller is changed from the small diameter part to the large diameter part 6 Therefore, the weft transport speed by the pair of feed rollers is such that the weft moves in the direction shown by the solid line arrow. At times it becomes progressively faster, and when moving in the direction indicated by the dashed arrow it becomes progressively slower. In other words, when the weft starts to be fed by the feed roller pair 16A during length measurement, the tension applied to the raw yarn is relatively small, so problems such as yarn breakage do not occur. Of course, the measured length of the weft yarn by the pair of taper rollers is based on the width of the spread cloth, but this length is determined by the average diameter of the drive roller 19Ab, its rotation speed, and the movement of the weft yarn guide member L6a from the standby position to the side length position. based on various factors such as the time it takes to return to the standby position.

It is determined by setting the energization time to the solenoid 22. The embodiment shown in FIG. 4 also operates at the timing shown in the flowchart shown in FIG.

(Effect of the invention) As described above, according to the weft length measuring device of the present invention.

By sandwiching the weft yarn between a pair of rotationally driven feed rollers, the length of the weft yarn is measured and forcibly sent toward the nozzle, so the sub-length movement does not place a load on the nozzle that causes the weft to fly. This completely eliminates the problems of insufficient weft insertion and increased capacity of the pump system.

[Brief explanation of the drawing]

Fig. 1 is a front view of a weft sub-length device of a fragmentary loom showing a first embodiment of the present invention, Fig. 2 is a side view showing the relative positions of a pair of feed rollers and a weft guide member, and Fig. 3 is a plan view of the same. , 4th
The figure is a side view of a pair of feed rollers and a weft guide member showing only the main parts of a second embodiment of the present invention, FIG. 5 is a plan view of the same, and FIG.
The figure is a line diagram showing the rise of the weft speed during length measurement, Figure 7 is a flowchart showing the operation of the device of the present invention, Figure 8 is a front view showing an overview of the fragment loom, and Figure 9 is the main part of the same as above. FIG. 2... Warp, 7... Opening, 8... Weft, 13.
...Fluid nozzle, 16.16A...Feed roller pair,
19... Weft guide member, 22... Solenoid, 1
8...Control device. Patent applicant -n ″″ 'tA'-I Town

Claims (1)

[Scope of Claims] 1. A fragmentary loom in which a weft measured to a predetermined length is sent between the warp yarns in which an opening is formed by a fluid nozzle and driven by a reed, wherein the fluid nozzle and the weft supply mechanism are connected to each other. A pair of feed rollers are disposed on the weft path between the two and are driven to rotate in the weft conveying direction at least when the weft side is being lengthened. a weft guide member provided movably between a length measurement position where the weft is held between a pair of feed rollers and sent toward the fluid nozzle, and a standby position where the engaged weft is separated from the pair of feed rollers; a guide member moving means for moving the weft guide member to the side length position when the weft is flying, and positioning the weft guide member to the standby position when the weft is not flying; and moving the weft guide member to either of the two positions. A control device for controlling the operation of the guide member moving means to selectively position the guide member. 2. The pair of feed rollers is composed of a pair of tapered rollers, and the waiting position of the weft guide member is on the side of the small diameter part of the tapered roller, and when the weft is on the weft side, the weft is moved away from the small diameter part of the rollers. The weft side length device in a fragmentary loom according to claim 1, characterized in that the weft side length device is moved toward the diameter portion.