JPH0336544Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a circular loom for weaving a tubular fabric using warp and weft threads, and particularly to a shedding device for shedding the warp threads.

2. Description of the Related Art Generally used circular looms have a structure in which a plurality of shuttles are supported by a circular shuttle guide and a large number of healds are arranged along the shuttle guide. This circular loom can weave a cylindrical fabric using the warp and weft by running the machine along a shuttle guide, opening the warp by each heddle, and letting out the weft from each shuttle.

In order to open the warp threads in this type of circular loom, it has been proposed to connect a predetermined number of healds to an iron heald frame, and to operate this heald frame by a pair of upper and lower belts. The belts are engaged with a pair of upper and lower pulleys, and the heald frame is disposed between one end and the other end of each belt and connected to each belt. Further, one belt is connected to a cam follower that moves up and down as the shuttle travels.
Therefore, each belt and heald frame can be driven by the cam follower, and each heald frame and its healds can be moved up and down in mutually opposite directions. The warp threads can therefore be opened by each heddle. However, this shedding device requires machining of an iron heald frame, resulting in a problem of high cost. Furthermore, although there has recently been a demand for faster weaving of tubular fabrics, the heavy weight of iron heald frames has been a major obstacle to speeding up weaving.

Purpose of the invention Therefore, the invention was made with the aim of reducing the cost of a shedding device for a circular loom and making it possible to speed up the weaving of tubular fabrics.

Structure of the device This device has one end and the other end of a pair of upper and lower wide belts engaged with a pair of upper and lower pulleys facing each other, and a predetermined number of healds are arranged between one end and the other end of each belt. . Each heald is directly connected to each belt, and one belt is connected to a cam follower that moves up and down following the running of the shuttle.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of this invention will be described with reference to the drawings.

In the figure, the circular loom has a plurality of shuttles 1 and a number of healds 2. Each shuttle 1 is movably supported by a circular shuttle guide, and each heald 2 is arranged at intervals along the shuttle guide. Furthermore, a large number of warp yarns 3 are connected to each heddle 2.
The shuttle 1 runs along the shuttle guide, and each heald 2 sequentially and alternately moves up and down in opposite directions. Therefore, by each heddle 2 a warp thread 3
is opened, weft threads are let out by each shuttle 1, and a cylindrical fabric is woven by the warp threads 3 and weft threads.

The heald 2 is operated by a pair of wide belts 4H and 4L, which are engaged with a pair of upper and lower pulleys 6H and 6L. One end and the other end of each belt 4H, 4L are opposed to each other, and the width thereof is set to correspond to the spacing between a predetermined number of healds 2.

In this embodiment, as shown in FIG. 3, eight healds 2 are arranged between one end and the other end of belts 4H and 4L, respectively. Further, as shown in FIG. 2, both ends of the belts 4H and 4L are bent to form holes 7, and a bar 8 is inserted into each hole 7. Both ends of each belt 4H, 4L have a plurality of slits 9, and the healds 2 between the side edges of the belts 4H, 4L are inserted into the slits 9 of the belts 4H, 4L,
Strapped to bar 8. Belt 4H, 4L
The healds 2 outside the side edges of are tied directly to the bar 8. Further, a collar 10 and a snap ring 11 are fixed to the bar 8, and the spacing between the healds 2 is kept constant by the slits 9 of the belts 4H, 4L and the collar 10 of the bar 8.

The lower belt 4L is connected to a cam follower 12, which is vertically guided by a guide rod 13 and engaged with a cam groove 15 formed on the outer peripheral surface of a cam drum 14.

In the shedding device for a circular loom constructed as described above, when the shuttle 1 runs, the cam drum 14 rotates following it, and the cam follower 12 is operated by the cam groove 15 of the cam drum 14. The cam follower 12 is guided by a guide rod 13 and sequentially and alternately moves up and down. Each belt 4H, 4L is pulled by a cam follower 12, and pulleys 6H, 6
Rotate around L. Therefore, the healds 2 are sequentially and alternately moved up and down in opposite directions, and the warp yarns 3 are opened by each heald 2. Therefore, weft threads are let out from each shuttle 1, and a cylindrical fabric is woven by the warp threads and the weft threads.

As previously mentioned, in the past, an iron heddle frame had to be processed, which not only caused the problem of high costs, but also the weight of the heddle frame was an obstacle to speeding up the weaving of tubular fabrics. That's right. This shedding device uses a pair of wide upper and lower belts 4H, 4L, and each heald 2 is directly connected to each belt 4H, 4L, so there is no need to use an iron heald frame. Therefore, costs can be reduced. Furthermore, the weights of the belts 4H and 4L are small, and they can be driven at high speed. Therefore, weaving of the tubular fabric can be sped up.

Effects of the invention As explained above, this invention connects a pair of wide upper and lower belts 4H and 4L to a pair of upper and lower pulleys 6.
H and 6L, and one end and the other end of the belts 4H and 4L are opposed to each other. Then, a predetermined number of healds 2 are arranged between one end and the other end of each belt 4H, 4L, and each heald 2 is directly connected to each belt 4.
Since it is connected to H and 4L, there is no need to use the conventional iron heald frame, and problems associated with the weight of the heald frame do not occur, making it possible to speed up the weaving of tubular fabrics. Moreover, not only is it not necessary to specially process the iron heald frame, but also existing healds can be used as each heald 2, and the cost is low.
Furthermore, when the warp yarns 3 are opened by the healds 2, the warp yarns 3 do not touch the belts 4H, 4L, and there is no fear that the belts 4H, 4L will be worn out. Regarding the healds 2, if a particular heald 2 is damaged, only that heald 2 needs to be replaced, and each belt 4H, 4L
And it is not necessary to replace all the healds 2.
The number of healds 2 is not limited, and the density of the warp threads 3 can also be increased.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the principle of a circular loom, FIG. 2 is a sectional view showing an embodiment of this invention, and FIG. 3 is a side view of FIG. 2. 1...Shuttle, 2...Heald, 3...Warp,
4H, 4L...Belt, 6H, 6L...Pulley,
12... Come follow me.

Claims (1)

[Scope of utility model registration request] A plurality of shuttles are supported on a circular shuttle guide, a large number of healds are arranged along the shuttle guide, and at the same time the shuttles are run along the shuttle guide, the warp yarns are In a circular loom, the weft threads are let out from each of the shuttles, and the warp threads and the weft threads are used to weave a tubular loom. A predetermined number of healds are arranged between one end and the other end of each of the belts, with the other ends facing each other, and each of the healds is directly connected to each of the belts, and the healds are vertically movable following the running of the shuttle. An opening device characterized in that one of the belts is connected to a cam follower.