JPH0361780B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weft length measuring device for a shuttleless loom such as a fluid jet loom.

Generally, shuttleless looms, particularly fluid jet looms, are provided with a weft length measuring device for measuring and storing a weft of a length necessary for one weft insertion in advance. As this type of weft length measuring device, there is a so-called pipe type weft length measuring device in which the weft is carried in an air flow and stored in a storage pipe. However, this pipe-type weft length measuring device has a relatively large resistance when pulling out the weft from the storage pipe during weft insertion.
In addition, since the weft is inserted into the storage pipe using air current, it is difficult to accurately store the length of weft required for one weft insertion, which causes unstable weft insertion and can result in weft insertion errors. There was a defect in that it was easy for this to occur.

In order to eliminate the defects of the pipe-type weft length measuring device as described above, the weft supplied from the weft supply section is continuously wound in a coil shape on the circumference of the weft storage drum, and this winding is performed during weft insertion. A drum-type weft length measuring device has been proposed that pulls out the weft threads that have been removed. In this weft length measuring device, a pair of weft locking bodies for controlling the winding amount and withdrawal of the weft are provided so as to be retractable from the circumferential surface of the weft storage drum.

The weft locking body provided in this type of conventional drum-type weft length measuring device is configured to move in and out by swinging motion along a plane perpendicular to the axis of the drum. Of the wefts wound into a coil, the weft of the first turn remains locked until the moment the weft locking body sinks into the drum, and the wefts of the second and subsequent turns become the weft of the first turn. It tends to move over the weft and move in the weft drawing direction.
This has the disadvantage that the weft threads become tangled, which impairs the weft insertion function. In addition, the drum has a long hole formed in the circumferential direction so that the weft yarn locking body can move in and out of the drum, and the weft of the first roll in this long hole part is attached to the weft of the second and subsequent turns. Since the weft threads are located on the inside of the drum in the radial direction compared to the weft threads on the circumferential surface of the drum, the weft threads from the second winding onward are placed in the first winding at the moment when the weft thread locking body sinks into the drum. This has the disadvantage that it tends to move over the weft threads of the eye, and the weft threads tend to get tangled, which impedes the weft insertion function.

The present invention has been made in order to eliminate the above-mentioned defects of conventional devices, and its purpose is to provide a weft length measuring device that smoothly releases the weft without getting it entangled and is durable. .

Hereinafter, one embodiment embodying the present invention will be described based on the drawings. A rotating body 3 having a thread introduction hole 2 is supported by a bearing 4 on a frame 1 located on the side of a loom table of a loom. A pulley 5 is fixed to one end of the rotating body 3, and the rotating body 3 is rotated by a belt 6 in synchronization with the operation of the loom. Further, a thread winding tube 8 having a passage 7 communicating with the thread introduction hole 2 is fixed to the other end of the rotating body 3. A flanged bracket 10 is rotatably supported by a metal 11 on a shaft 9 extending concentrically from the rotating body 3, and a circular side wall 12 and a support plate 13 are attached to bolts 14 at the flange portion of the bracket 10. Fixed by This side wall 12 includes a cylinder 15 whose front face is closed and a head member 16 integrated into a notch of the cylinder 15. Furthermore, several attachment grooves 17 are cut in a part of the periphery, and the weft threads are An arcuate member 19 having a winding pin 18 forming part of the length measuring drum is fixed by bolts 20 so as to be adjustable in its position in the radial direction. Therefore, it is possible to change the length of the weft side. Further, a magnet 21 is attached to the support plate 13, and the support plate 22 on the frame 1 side is attached to the support plate 21 on the side of the frame 1, sandwiching the rotation locus of the thread-wound tube 8.
Due to the attraction force with the magnet 23 attached to the cylinder 15, the slope member 16 and the winding pin 1,
A measuring drum consisting of 8 is kept stationary.

On the other hand, the tip of the shaft 9 protruding into the cylinder 15 is supported by a bracket 24 integral with the cylinder 15, and a gear 25 is fixed thereto, which meshes with a gear 27 on a support shaft 26 fixed to the bracket 24. Also,
A gear 28 on the same shaft 26 meshes with a gear 31 integrally constructed with cams 29, 30 bearing on the shaft 9. Furthermore, swinging arms 32 and 33 urged by a spring 45 are pivotally supported within the cylinder 15, and their cam followers 34 and 35 are brought into contact with the cams 29 and 30 to swing in different phases. Fixed shafts 46, 47 and links 36, 37 are connected to the tips of the swing arms 32, 33, respectively.
The links 36 and 37 are connected to members 43 and 44 to which weft locking bodies 38 and 39 are fixed. The weft locking bodies 38 and 39 are slidably fitted into guide members 40 and 41 attached to the head member 16, and move in and out of the surface of the head member 16 as the cams 29 and 30 rotate. Note that the cylinder 15 is the weft locking body 3
Since the protruding and retracting positions of the cylinders 8 and 39 are sealed by the guide members 40 and 41, entry of fluff and the like is prevented, and the drive mechanism disposed inside the cylinder 15 can be maintained in good condition. In addition, the weft locking body 3
A space 42 is formed by slightly cutting out the surroundings of the protruding and retracting positions of the locking bodies 3 and 39.
The weft can be smoothly transferred from the 9th side to the 38th side without becoming entangled.

In the above configuration, when the thread winding tube 8 is rotated by the drive of the belt 6, the weft threads are sequentially wound onto the length measuring drum. At the same time, gears 25, 27, 2
Since the cams 29 and 30 are rotated via the cams 8 and 31, for example, as shown in FIG.
4 reaches the top of the cam 29, the swing lever 32
is pushed up, and the weft locking body 3 is held by the link 36.
8 can slide within the guide member 40 and project onto the head member 16 to lock the weft thread. next,
As shown in FIG. 4, the cam follower 34 is connected to the cam 29.
When it comes into contact with the lower part of the weft thread, the swinging lever 32 pivots downward and the link 36 causes the weft thread stopper 38 to slide downward within the guide member 40, releasing the weft thread.
Therefore, the weft locking bodies 38, 39 are connected to the links 36, 3
7, the guide members 40, 41
Since the direction of motion is regulated and guided by the guide, linear motion is applied, and the problem with conventional devices is that the locking body tends to catch the weft, especially when descending to release the weft. Can cause problems.

FIG. 5 shows an example of application of the present invention, and in particular only the mechanism on the weft locking body 38 side is schematically shown. In this example, a long hole 48 is provided protruding from the tip side of the swing lever 32, and a fixed shaft 46 of the link 36 is fixed therein. Therefore, if the fixed position of the fixed shaft 46 of the link 36 is fixed to the tip end side of the swing lever 32 as shown in the imaginary line, even if the same cam 29 is used, the protrusion height of the weft thread locking body 38 will be set as shown in the imaginary line. It is possible to easily make changes and adjustments when assembling the length measuring device or depending on the type of thread.

In the above embodiment, the guide members 40 and 41 are arranged in the head member 16, but the guide members 40 and 41 are arranged in the cylinder 15 so that the weft locking body of the head member 16 does not come out. The position may be formed by a long hole or the like.

Furthermore, the present invention may be a weft length measuring device that measures and stores a weft of a length necessary for weft insertion using a single weft locking member.

As described above, the present invention connects the weft thread locking body with a link to the rocking lever that swings by the cam in the length measuring drum, and also provides a guide section that swings and guides the weft thread locking body. Even with a similar structure, the weft thread locking body can perform linear motion, so there is no change in the state in which the weft thread locking body locks the weft threads, and the weft threads do not become entangled on the measuring drum during weft insertion. , the weft can be smoothly released, and the mechanism can be made durable. Furthermore, since it is a link connection, even if the number of weft locking bodies increases, such as for mixing, the positions and directions can be set freely.
Can be easily installed.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a sectional front view of a weft length measuring device, Fig. 2 is a sectional side view of Fig. 1, and Figs. 3 and 4 show the operation of the present invention. FIG. 5 is a schematic diagram illustrating another embodiment of the invention. 15: cylinder, 18: winding pin, 29, 30: cam, 32, 33: swing lever, 36, 37: link, 38, 39: weft locking body, 40, 41: guide member.

Claims (1)

[Claims] 1. A weft locking body is provided that sequentially winds the weft yarns supplied from the weft supply section onto the length measuring drum and regulates the separation of the weft yarns required for one weft insertion from other weft yarns. In the weft length measuring device which performs weft insertion by releasing the weft, a guide portion is formed in the length measuring drum to allow linear movement of the weft locking body, and a guide portion is formed in the drum to allow the weft locking body to move in a straight line. A cam that rotates in synchronization and a swinging lever that swings by the cam are provided, and a link is provided that is rotatably connected to the swinging lever and rotatably connected to the weft locking body. A weft length measuring device for a shuttleless loom, which is characterized by: