JPH0248445Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an improvement of a thread tensioning device for a jia guard connected to a lower part of a heald via a connecting thread.

In addition, in this specification, a constant force spiral spring is
When a certain load is applied to the outer end of a spiral spring, the spiral portion is rotated in the direction of the load and the outer layers are sequentially peeled off, and when the load is released, the peeled layers return to their original state. say.

<Prior art> From the viewpoint of enabling high-speed operation of Jiya Guard, elastic threads and tension coil springs have been used instead of arrows as the thread tensioning device (Japanese Patent Publication No. 51-9059, etc.). reference). These elastic threads and tension coil springs are connected at one end to a connecting thread under the heald, and at the other end to a base plate at the lowest end of the jacket. Then, the heddle in the raised position is surely and quickly returned to the lower position when the knife and the hook are separated, and furthermore, the heald is stabilized in the lower position and acts to apply a constant tension to the warp threads of the fabric.

<Problems to be solved by the invention> However, the above elastic threads and tension coil springs have the following problems.

(a) Since the tensile force increases in proportion to the opening amount of the heald, the opening amount should be made as small as possible to prevent thread breakage and damage to the hook (needle-like). Therefore, restrictions are imposed on the device for threading the weft thread, and the degree of freedom in designing the jia guard is reduced.

(b) Elastic threads are easily broken, and in tension coil springs, the free height increases due to permanent strain, which may change the tension that should be applied to the warp yarns and affect the texture of the fabric. Therefore, it is necessary to frequently inspect and replace parts, which requires maintenance. In particular, it was very difficult to warp and replace parts in the narrow space of the Jia Guard system, which had nearly a thousand healds lined up.

<Apparatus for Solving Problems> The present invention has been made to solve these problems. That is, it is a thread tensioning device for a jia guard that is connected to the lower part of the heald via a connecting thread, and a constant force spiral spring corresponding to each heald is installed on a fixed shaft located below the heald and in the direction of the heald. This is a thread tensioning device of Jia Guard, which has a structure in which the spiral portion of the constant force spiral spring is fitted and the outer end of the constant force spiral spring is connected to the connecting thread.

<Example> An example of the present invention will be described below with reference to FIGS. 1 to 3.

1 is a perspective view of the thread tensioning device 1 of the embodiment, A in FIG. 2 is a cross-sectional view taken along the - arrow line in FIG. (not shown) is fixed in the direction of the heald.

7 is a receiving drum for the spiral leaf spring 9, and the spiral portion 9b of the constant force spiral spring 9 is loosely fitted between the collar portions 8, 8 at both ends. This receiving drum 7 is fitted on the fixed shaft 3 below the corresponding heald 5. More specifically, the outer end 9a of the constant force spiral spring 9 is positioned on the virtual extension line of the heald 5. Although only one thread tensioning device 1 is shown in the figure, one thread tensioning device 1 is provided for each heald 5.

The constant spiral leaf spring 9 is loosely fitted into the drum 7 with the center of its spiral portion 9b being received, and its outer end 9a is connected to the connecting thread 11 with the outer layer of the spiral portion 9b being peeled off. The constant load spiral spring 9 was one in which the outer layer of the spiral portion 9b was peeled off when a load of 150 gF was applied to the outer end 9a.

The flange 8 of the receiving drum 7 is designed to (i) prevent interference between adjacent constant force spiral springs 9, and (ii) prevent even the slightest amount of fabric fluff from accumulating between the layers of the spiral portion 9b. It is not necessary.

Alternatively, the constant force spiral spring 9 may be attached to the fixed shaft 3 in such a manner that its movement in the axial direction is restricted, but it is rotatable in the circumferential direction (see B in FIG. 2).

In the narrow gear guard device, as shown in Fig. 3, multiple fixed shafts 3 with steps are installed.
On the other hand, it is preferable to arrange the adjacent thread thread 1, connecting thread 11, heald 5, horse thread 13, thread thread 15, and hook 17 in this order to prevent mutual interference.
In addition, 19 is a knife, and 21 is a warp.

Thread tensioning device 1 of the embodiment having such a configuration
When the heald 5 is in the lower position, a predetermined tension is applied to the warp threads 21 by the constant force spiral spring 9. Even if the opening amount of the heald 5 changes, only the amount of peeling of the outer layer of the spiral portion 9b increases, and the tension of the thread 15 hardly changes. That is, this is because only a force is applied to the constant force spiral spring 9 to return it to its original shape after being peeled off from the spiral portion 9b and made into a straight line. Of course, when the hook 17 and knife 19 are separated, the heald 5 is reliably and quickly returned to the lower position by the force of the peeled portion of the constant force spiral spring 9 returning to its original shape.

<Effects of the invention> As explained above, the thread tensioning device of the invention has a configuration in which the spiral portion of the constant force spiral spring is fitted into the fixed shaft, and the outer end is connected to the connecting yarn under the heald. Therefore, the following effects are achieved.

(a) There is almost no increase in the tensile force with respect to the opening amount of the heald, and even if the opening amount is increased, thread breakage and damage to the hook are less likely to occur, and the degree of freedom in designing the Jia Guard increases.

(b) Compared to conventionally used elastic threads and tension coil springs, constant load spiral springs are less prone to permanent deformation due to fewer changes in stress, reducing the need for maintenance such as inspections. Even if permanent deformation or damage occurs in the holding part - usually occurring in the outer layer of the spiral part, which is constantly changing its shape - if that part is cut and removed, the remaining part will become a constant load spiral like new. It acts as a spring, eliminating the need for parts replacement. This has the effect of making it easier to work inside the narrow Ja-Guard device.

[Brief explanation of drawings]

The figures show a thread tensioning device according to an embodiment of the present invention, in which Fig. 1 is a perspective view, and A in Fig. 2 is a -
2 is a sectional view taken along the arrow line, B in FIG. 2 is a sectional view without the receiving drum 7, and FIG. 3 is a usage diagram. 1... Thread tension device, 3... Fixed shaft, 5
...Held, 9...Constant force spiral spring, 9a...
Outer end portion, 9b... spiral portion, 11... connecting thread.

Claims (1)

[Claims for Utility Model Registration] A thread tensioning device for a jia guard connected to a lower part of a heddle via a connecting thread, wherein a fixed shaft located below the heddle and in the direction of the heddle includes each of the above-mentioned parts. A thread tensioning device for a Jia Guard, characterized in that a spiral portion of a constant force spiral spring is fitted in correspondence with the heald, and an outer end of the constant force spiral spring is connected to the connecting thread.