JPH043022Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a device for correcting the tension of warp threads in a circular loom.

<Prior Art> A circular loom is a loom suitable for weaving a cylindrical fabric and sewing it into a bag shape as it is, and many proposals have been made regarding its warp yarn delivery device.

The product woven by the circular loom is pulled upward by the product take-up roller at the top, and the rotational driving force used by this roller to take up the product causes the warp thread delivery roller to rotate without any driving force. Warp yarns are pulled out from a creel, which is a source of warp yarns. However, the warp yarn pulled out from the creel causes tension changes in the warp yarn due to differences in yarn speed, bobbin diameter, number of bobbins, etc., and the product is not uniform. The tension of the warp threads is adjusted by rotating it. As a drive source for the warp yarn delivery roller, a torque motor separate from the main drive source or a structure that transmits power from the main shaft of the loom main body is considered (for example,
−40379).

<Problem to be solved by the invention> The former of the above conventional technologies, that is, the drive mechanism that uses a torque motor to rotate the warp thread feed roller at a circumferential speed higher than the warp thread speed, is difficult to start the loom. Another problem is that when stopped, uneven weaving occurs due to differences in inertia between the main body and rollers, characteristics of the torque motor, and time differences. In addition, when weaving by changing the weaving density, for example from 8 threads/inch to 16 threads/inch, the weaving density will change twice as much, and even if the voltage is adjusted, the relationship between torque and rotational speed will change. Another problem was that it was difficult to maintain constant conditions. In the latter case, that is, when using the drive source of the loom itself, it is necessary to reduce the speed using gears etc. in order to match the rotation speed of the delivery roller.
The gear had to be changed every time the weave density changed, resulting in poor workability. Further, it was difficult to adjust the tension when conditions such as the size of the warp bobbin were changed.

<Means for Solving the Problems> Therefore, in order to solve the above problems, the present invention has a product take-up roller 16 and a warp yarn delivery roller 3, both of which are driven by the drive motor 15 of the circular loom main body. In this circular loom, an electromagnetic powder clutch 12 is provided behind the weft thread driving conversion gear 11 in the transmission element from the main shaft 5 to the warp thread delivery roller 3, and the output shaft 19 of the electromagnetic powder clutch 12 and the warp thread delivery roller 3 are connected to each other. connected to the yarn sending roller 3,
We have developed a warp thread tension correction device for a circular loom, which is characterized by controlling the rotational torque of the roller 3 by exchanging current values.

<Function> Since the structure is as described above, the speed of the warp thread 1 sent out from the creel is determined by the speed of the warp thread delivery roller 3 which rotates depending on the speed at which the product 9 is taken up under certain conditions, and the speed of the warp thread 1 sent out from the creel is determined under certain conditions. Drive conversion gear 1
By connecting the warp yarn delivery roller 3 to the rear of the yarn transfer roller 1 through an electromagnetic powder clutch 12, the above-mentioned problems of the prior art can be solved. In addition, the warp thread sending roller 3
Only the rotational torque of can be adjusted by the current value of the electromagnetic powder clutch 12.

<Examples> Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic side view of a circular loom equipped with this device. As shown in this figure, warp yarn 1 is fed from a warp yarn supply source (not shown) to guide roller 2, warp yarn delivery roller 3, guide It passes through the roller 2 and the dancing lever 4 and reaches the gauge ring 6 mounted around the main shaft 5. Then, the warp thread 1 heald is opened by the wire healds 7, 7 which move up and down between the gauge ring 6 and the dancing lever 4, and the shuttle 8 passes through this heald by the rotation of the main shaft 5, and the weft thread is threaded. The threads are woven into a cylindrical woven product 9.

Since the warp thread 1 repeatedly moves up and down at high speed in conjunction with the wire heald 7, excessive tension or loosening (tension change) is likely to occur. This is lever 4. This dancing lever 4
absorbs tension changes by swinging.

The main shaft 5 is connected to a main body drive motor 15 and a reducer 18.
A cam drum 20 mounted on the main shaft 5 operates the wire healds 7, 7 to open and close the warp 1 heddle.

The warp thread tension correction device according to the present invention adjusts the torque of the warp thread delivery roller 3 from the drive source of the loom main body via the electromagnetic powder clutch 12.
The warp yarn is sent out, and the drive of the main body drive motor 15 is the main shaft 5, reduction gear 18, belt drive 10, weft yarn driving conversion gear 11, and the output of the electromagnetic powder clutch 12 provided in the present invention. The output shaft 19 and the warp thread delivery roller 3 are connected via a shaft drive 13, a chain drive 14, etc., so that the warp thread delivery roller 3 is rotated. A take-up drive shaft 17 for transmitting the driving force for rotating the product take-up roller 16 is connected to the weft driving conversion gear 11, and the product take-up roller 16 also has a structure in which the same main body drive motor 15 is used as a drive source. It is.

Here, the feature of the present invention is that in a circular loom having a product take-up roller 16 and a warp yarn delivery roller 3 that use the drive motor 15 of the circular loom main body as the same drive source, the warp yarn is Weft driving conversion gear 11 in the transmission element to the delivery roller 3
An electromagnetic powder clutch 12 is provided at the rear of the electromagnetic powder clutch 12. And this electromagnetic powder clutch 12
The output shaft 19 of the warp thread delivery roller 3 is connected to the warp thread delivery roller 3, and the rotational torque of the delivery roller 3 is controlled by exchanging current values. By providing the electromagnetic powder clutch 12 behind the weft thread driving conversion gear 11, the weft thread can be pulled out heavily in response to changes in the swinging position of the dancing lever 4 due to changes in the weight or quantity of the weft thread package, that is, changes in tension. If it is light, apply a torque to the delivery roller 3, and vice versa if it is light, apply a low torque to the dancing lever 4.
This is to position the swing range of the That is, the dancing lever 4 is provided with an excessive tension stopper 2.
1 and an under-tension stopper 22 are provided, and when abnormal tension is applied to the warp thread, the dancing lever 4
Since the loom comes into contact with these stoppers 21 and 22 to stop the loom, it is important for stable operation of the loom that the swinging range of the dancing lever 4 is positioned normally.

<Effects of the Invention> As detailed above, the warp thread tension correction device for a circular loom according to the present invention greatly reduces weaving irregularities that occur particularly when starting or stopping, thereby improving product quality. In addition, this device makes it possible to easily change the weaving density significantly and to weave stably at a stable density without unnecessary stoppage of the loom due to excessive or under tension, which also helps improve production efficiency. .

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a circular loom equipped with this device. 1... Warp thread, 3... Warp thread sending roller, 4...
...Dancing lever, 5...Main shaft, 7...Wire heald, 8...Shuttle, 9...Product, 11...
... Weft thread driving conversion gear, 12 ... Electromagnetic powder clutch, 15 ... Main body drive motor, 16 ... Product transaction roller, 19 ... Output shaft, 20 ... Cam drum.

Claims (1)

[Scope of utility model registration request] A product take-up roller 16 and a warp yarn delivery roller 3 that use the drive motor 15 of the circular loom main body as the same drive source.
In a circular loom comprising:
is provided, and the output shaft 1 of the electromagnetic powder clutch 12 is
9 and a warp thread sending roller 3 are connected to each other, a warp thread tension correction device for a circular loom.