JPS632458Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a warp thread tension adjustment device for a circular loom, and relates to an improvement of the spring tension structure of a so-called dancing lever.

FIG. 1 is a schematic side view of a circular loom, in which the warp threads 1 are transferred from a large number of warp thread bobbins 2 to guide rollers,
The wire heald 8a moves up and down between the inner gauge ring 6, the outer gauge ring 7, and the dancing lever 4 in order to reach the dancing lever 4 via the warp thread delivery roller 3 and the guide roller, and to weave the product 5 here. The threads 8b are alternately passed through and opened, and the weft thread 10 is supplied by the shuttle 9. The power for the circular movement of the shuttle 9 and the vertical movement of the wire healds 8a and 8b for shedding the warp threads is transmitted from the push roller arm 12 and the cam drum 13, which rotate around the main shaft 11 at the center of the circular loom. This is converted into vertical movement of the wire heald by the cam strip 14.

The warp thread tension tuning device according to the present invention is composed of a dancing lever and a spring for controlling the swinging force of the dancing lever. Dimensional changes occur constantly, and the linear length between the inner gauge ring 6 of the warp thread 1 and the dancing lever 4 extends to ₁ + ₂ due to the vertical movement of the wire healds 8a and 8b, and the dancing lever changes in synchronization with this tension change. This device uses a spring 16 to pull the lower end of the dancing lever 4, and absorbs changes in tension by swinging the dancing lever 4.

Since the difference in dimensional change of warp thread 1 is ₁ + ₂ >>, it is usually difficult to set it with one spring.
Conventionally, as shown in Figure 3, two springs were used.
By installing the books in parallel and applying special processing to the spring, the spring acts until the swing angle α of the dancing lever, and when it exceeds α and reaches the β range, the spring becomes tense and the combined spring constant I'm trying to make it work. However, as is clear from FIG. 3, this is a structure in which the spring is complicated and costly, and it is difficult to set the spring constant. Since there are as many dancing levers around a circular loom as there are warp threads, their simplification and ease of adjustment are important components that have a significant impact on equipment costs and product quality.

The present invention has a structure that makes it difficult for unbalanced warp thread tension to occur, and has been improved so that if an unbalanced warp thread tension occurs due to thread breakage or other causes, it is immediately sensed and the loom is stopped. So, spring A with a large spring constant is attached to the dancing lever.
and a spring B with a small spring constant are connected in series via a hook having a predetermined length of play, and a fixing ring is inserted into the hook.

FIG. 4 is a side view showing an embodiment of the present invention,
A warp thread guide hole 18 is provided at one end of a large number of dancing levers 4 that swing by a shaft ring 17, and the warp thread 1 is passed through this and pulled in the direction of the arrow. A large number of spring locking holes 19 are provided at the other end of the dancing lever 4 to resist the forward inclination of the dancing lever 4, and a spring A16A with a large spring constant and a spring B16B with a small spring constant are connected in series to these holes. A hook 20 having a predetermined length of play is interposed at the connecting portion between spring A and spring B,
Moreover, this hook 20 is entirely inserted through a ring-shaped fixing bar 21 that goes around the circular loom. Therefore, in the normal swing range α of the dancing lever 4, the spring A and the spring B act with a series spring constant, and the spring B, which has a small spring constant, takes priority. Next, when the tension of the warp thread 1 increases and enters the swinging range β where the tension is large, the lower end of the hook 20 comes into contact with the fixing ring 21, and only the spring A works, and the spring constant of the spring A becomes large. This prevents the dancing lever 4 from tilting forward. At point P, a shaft ring 1 is installed behind the dancing lever 4, on the right side of Fig.
A breakage ring 22 is wound around in parallel with 7. The breakage ring 22 is also set at a position where the dancing lever 4 comes into contact with the loom to stop the loom even if the yarn breaks or the yarn tension reaches point Q, which is abnormally low.

As detailed above, the warp thread tension tuning device of the present invention has a structure in which two springs A and B are connected to the dancing lever in series via a hook, so it is easy to attach and detach a large number of springs. This is an excellent device that leads to cost reduction and contributes to uniformity of the product by reducing variations in warp thread tension.

[Brief explanation of the drawing]

Figure 1 is a schematic side view of a circular loom, Figures 2 a and b
is an explanatory diagram showing the fluctuation of the warp thread length when the warp thread is opened, and Figure 3 is a side view of a conventional dancing lever.
FIG. 4 is a side view of the dancing lever of the present invention. 1... Warp thread, 3... Warp thread sending roller, 4
...Dancing lever, 16...Spring, 17...
Shaft ring, 18...Warp thread guide, 19...Spring locking hole, 20...Hook, 21...Fixing bar, 2
2... Brake ring, ,... Conventional spring, A, B... Spring of the present invention.

Claims (1)

[Scope of utility model registration request] In a circular loom in which a large number of warp threads from a large number of warp thread bobbins pass through warp thread delivery rollers, guide rollers, and dancing levers, the warp threads are opened in a shuttle travel path, and are woven into a tubular fabric. A warp thread guide 18 is provided at one end of the
In a circular loom, a spring A with a large spring constant and a spring B with a small spring constant are connected in series via a hook 20 having a predetermined play at the other end, and a fixed bar 21 is inserted into the hook. Warp thread tension tuning device.