JPS609268Y2 - Weft length measuring device - Google Patents

Description

[Detailed description of the invention] This invention relates to a weft length measuring device used to measure the length of weft threads in a shuttleless loom.

Conventional length measuring devices of this type are known to measure length by winding the weft multiple times around a feed roller (length measuring roller) that rotates in pressure contact with a length measuring drum that rotates in conjunction with the rotation of the loom. The entire circumferential surface of the measuring roller is made of metal such as stainless steel, which is a so-called low-friction material that has a relatively small coefficient of friction with the weft, or is made of nitrile-butadiene, which has a relatively large coefficient of friction with the weft. There is one in which the entire circumference of the measuring roller is made of a high friction material such as rubber.

However, the former, in which the entire circumference of the length-measuring roller is made of a low-friction material, has the disadvantage that when measuring the length of processed yarn, etc., slip increases and length measurement unevenness tends to occur.
In addition, in the case of the latter, in which the entire circumference of the measuring roller is made of a high-friction material, depending on the type of yarn (for example, non-processed yarn such as nylon yarn), it is difficult for the weft yarn to separate from the length measuring roller. There is a drawback that the weft thread gets wrapped around the length measuring roller, making it impossible to measure the length of the weft thread and to store it later in a storage device.

This idea was created by focusing on these conventional problems, and by forming a part of the circumferential surface of the weft length measuring roller with a high friction material such as rubber, it is possible to prevent the weft from slipping and The purpose of this invention is to prevent the winding of nylon threads, etc., and to enable accurate length measurement and storage of weft threads.

Embodiments of this invention will be described below with reference to the drawings.

In the figure, 1 is a length measuring drum that rotates in conjunction with the rotation of the loom; 2
is a feed roller that rotates while being pressed against the length measuring drum 1;
3 is a support arm of the feed roller 2, 4 is a spring retaining pin thereof, 5 is a weft length measuring roller integrally formed concentrically with one side of the feed roller 2, and 6 is an appropriate distance from the weft length measuring roller 5. 7 is a yarn feeder, 8 is a weft yarn, and 9 is a storage device.

After the weft yarn 8 pulled out from the yarn feeder 7 is wound several times between the separation guide 6 and the weft length measuring roller 5,
Enter the storage device 9 and enter the weft inserting device (not shown) from this
be led to.

1 and 2 show a first embodiment of this invention, which consists of a winding start portion 5 on the circumferential surface of the weft length measuring roller 5.
a is made of a high friction material 10 such as rubber, and the winding end portion 5b is made of a low friction material such as stainless steel.

In this case, as shown in FIG. 2, an annular groove 5c is formed at the beginning of the winding of the length measuring roller 5, and a rubber ring-shaped high friction body 10 is stretched and fitted into this groove 5c so that it can be attached and detached. become.

3 and 4 show a second embodiment of this invention, in which circular high-friction bodies 11 are distributed at appropriate intervals on the circumferential surface of the length-measuring roller 5. be.

In this case, as shown in FIG. 4, the length measuring roller 5 is provided with a stepped hole 5d, and after fitting the flanged cylindrical high friction body 11 into the hole 5d from the inner circumference of the length measuring roller 5. A thin cylinder 12 is fitted as a stopper into the inner circumference of the length measuring roller 5, and a retaining ring 13 is fixed to the outer surface of the length measuring roller 5 with a screw 14 as shown in FIG. For example, the high friction body 11 can be attached and detached, which is convenient.

FIG. 5 shows a third embodiment of this invention, in which i5e each having a convex cross-section is placed on the shaft of the length-measuring roller 5 at four equal positions on the circumferential surface of the length-measuring roller 5. Carved in parallel,
A high friction body 15 having a convex cross section is also provided in these grooves 5e.
is inserted.

In this case as well, the high friction body 15 can be made detachable.

13 in the figure is a retaining ring similar to that shown in FIG. 3.

Next, the effects of this invention will be explained.

In FIG. 1, the weft yarn 8 pulled out from the yarn feeder 7 is first wound around the high friction body 10 of the length measuring roller 5 via the separation guide 6.

Since this high friction body 10 is made of a material such as rubber that has a large coefficient of friction with the weft thread 8, the length of the weft thread 8 can be accurately measured at this portion 5a without slipping.

Before the weft yarn 8 enters the storage device 9, the weft yarn 8 is in contact with the metal part of the length measuring roller 5, which is a low friction part.
There is no resistance to the separation of the weft yarn 8 from the length measuring roller 5.

Therefore, there is no possibility that the weft yarn 8 will be wrapped around the length measuring roller 5 due to the pulling force of the storage device 9.

Furthermore, in the second embodiment shown in FIG. 3, circular high-friction bodies 11 are distributed around the circumferential surface of the length-measuring roller 5, so the weft yarn 8 is in a portion that is in contact with the high-friction bodies 11. Since slipping is prevented in the weft area, and the weft yarn 8 is easily detached from other low-friction areas, neither slipping nor winding occurs in the end.

Therefore, depending on the yarn type, this second embodiment is very effective.

Further, in the third embodiment shown in FIG.
, the weft thread 8 wound around the length measuring roller 5 is prevented from slipping in the high friction part, and the weft thread 8 is easily separated from the metal part which is the other low friction part. After all, in this case as well, slipping and winding of the weft yarn 8 can be prevented.

Furthermore, as mentioned above, the high-friction bodies 10, 11.15 of each embodiment can be attached to and detached from the length measuring roller 5, making it easy to replace parts and always achieving the intended purpose. can be a distant relative.

Since this invention is as described above, it has the excellent effect of preventing weft threads from slipping and wrapping, and making it possible to accurately measure and store weft threads.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a weft length measuring device showing a first embodiment of this invention, Fig. 2 is a partial sectional view of a weft length measuring roller, and Fig. 3 is a weft length measuring device showing a second embodiment of this invention. FIG. 4 is a partial sectional view of the weft length measuring roller, and FIG. 5 is a partially exploded perspective view of the weft length measuring roller showing a third embodiment of this invention. 1...Length measuring drum, 2...Feed roller, 3...Support arm, 4...Spring retaining pin, 5... Weft length measuring roller, 6.
...Separation guide (yarn guide), 7...
- Yarn feeder, tail...weft, 9... storage device, 10. 11. 15... High friction body.

Claims (1)

[Scope of utility model registration request] In a weft length measuring device that measures the length of a weft by winding the weft multiple times between a weft length measuring roller and a separation guide of a loom, a part of the circumferential surface of the weft length measuring roller is made of a high friction material. A weft length measuring device characterized by: