JPS6239109Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a warp delivery device for a loom.

In the case of a loom, the rotation speed of the warp beam is appropriately changed during operation because it is necessary to maintain the warp tension at a constant value regardless of changes in the winding diameter of the warp beam.
As such a warp sending device, for example,
−154260 is known. In this type of device, a tension roll for guiding the warp threads is attached to one end, and a tension lever rotatably supported detects the warp thread tension or tension fluctuation. When the warp tension fluctuates, the tension lever rotates, and this displacement is transmitted to the speed change lever connected to the warp delivery amount control mechanism via a transmission mechanism such as a weight lever or rod, thereby increasing the rotational speed of the warp beam. are changed as appropriate.

By the way, changes in warp tension are not only caused by relatively gradual changes such as changes in warp beam diameter, but also high-frequency fluctuations occur due to warp shedding motion or beating, and these high-frequency vibrations are caused by speed changes. When transmitted to the lever, the rotational speed of the warp beam changes and the warp delivery amount fluctuates significantly, causing problems in weaving and reducing the quality of the fabric. Vibration significantly accelerates wear of various parts, shortening the life of the device. For this reason, high frequency vibrations of the tension lever are generally buffered or absorbed by connecting the tension lever to a weight lever via an elastic body such as a spring.

However, in order to prevent resonance with high-frequency vibrations, it is necessary to use an elastic body with a large elastic constant, so the high-frequency vibrations of the tension lever cannot be completely absorbed by the elastic body alone, and the shift lever does not absorb high-frequency vibrations with a certain amplitude. It vibrates. Therefore, in the invention of Utility Model Application Publication No. 53-154260, high-frequency vibrations of the weight lever or gear shift lever are prevented by making the weight lever rotatable only during a predetermined period, and the crank angle range is fixed. It has a mechanism that prevents the tension from being transmitted to the tension roll lever over the period of time.

On the other hand, if the loom stops due to some kind of trouble, the warp beam stops rotating and the warp delivery is stopped. At this time, tension is still applied to the warp threads, so the warp threads elongate, and therefore the warp thread tension gradually decreases after the stand is stopped.
For this reason, the speed change lever is gradually displaced while the machine is stopped, changing the rotational speed of the warp beam, that is, the warp delivery amount.

For this reason, the warp delivery amount immediately after restarting becomes inappropriate and gradually returns to the normal value as soon as restarting starts, causing weaving defects called so-called trusses to occur on the woven fabric.
In order to prevent such weaving defects, for example,
No. 51-5564 is known. In this design, the tension control mechanisms such as the weight lever and gear shift lever are fixed only when the platform is stopped using a brake mechanism consisting of a solenoid, thereby preventing the shift lever from shifting when the platform is stopped.

Therefore, in order to realize a perfect warp let-off device, it is necessary to combine Japanese Utility Model Application Publication No. 53-154260 and Japanese Utility Model Application Publication No. 51-5564, but this will complicate the mechanism and require a large space for installation. Furthermore, the device of Japanese Utility Model Application Publication No. 51-5564 operates a solenoid etc. by an electric signal when stopped, so the equipment is expensive and requires careful maintenance and inspection.

In view of these circumstances, the purpose of this invention is to provide a device that has a simple mechanism and has the various functions required for the above-mentioned delivery device.
The main idea is to constantly apply a predetermined amount of braking force to the weight lever so that the weight lever can be moved during operation only when a change in tension greater than the braking force occurs, and to fix the weight lever using the braking force while the machine is stopped. do.

The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings.

In FIG. 1, warp yarns Y wound around a warp beam 1 are guided to a heald frame (not shown) via a tension roll 2a supported on the left end of a tension lever 2. The tension lever 2 is rotatably supported by a fixed bracket 3, and one end of a tension rod 5 elastically biased by a spring 4 is attached to its right end 2b.

The other end of the tension rod 5 is a fixed bracket 6
One end of the weight lever 7 is pivotally supported at a predetermined position of a rotatably supported weight lever 7, and a weight 8 is attached to the other end of the weight lever 7. One end of a rod 9 is also pivotally supported at an appropriate position on the weight lever 7. The rod 9 is connected to a speed change lever 12 of a warp delivery amount control mechanism 11. That is, the speed change lever 12 is connected to the weight lever 7 via the rod 9 so that there is no mechanical play. In addition, one end of a brake plate is pivotally supported at an appropriate position on the tip side of the shaft support of the rod 9 of the weight lever 7, and the other end of this brake plate 10 is connected to the brake base 13 and one end of the brake lever 14. is sandwiched between. The brake base 13 is fixedly supported, and the brake lever 14 is rotatably supported by a fixed bracket 15.

The other end of the brake lever 14 is also attached to the other end of a spring 18 which has one end engaged with a hook 17 fixed to the fixed bracket 16.

In the embodiment of this invention having the above configuration, while the loom is operating, the total tension of the warp Y is kept at a constant value T as shown by the solid line in Fig. 2A as the warp opens and closes. It fluctuates periodically around the center. Incidentally, the dashed line in the figure indicates that when the tension exceeds this value, the brake plate 10 overcomes the frictional force applied from the brake base 13 and the brake lever 14 and moves. Here, the brake plate 10 is connected to the brake base 13 and the brake lever 1.
When the brake force is not received from weight lever 7, the displacement of tension lever 2 causes weight lever 7 to be applied.
varies as shown in FIG. 2B.

In reality, the brake plate 10 receives the braking force from the brake base 13 and the brake lever 14, so it does not displace due to fluctuations in the total warp tension between the dashed dotted lines shown in FIG. 2A. The increase in warp total tension from a constant value T is brake plate 1
This is because it remains within the range of the maximum frictional force acting on zero. When the total warp tension exceeds the maximum frictional force caused by the braking force, that is, in the shaded area in FIG. The weight lever 7 rotates clockwise or counterclockwise. The displacement of the weight lever 7 is shown in FIG. 2C.

If some trouble occurs in the loom, such as a weft insertion error, the operation of the loom is stopped and the rotation of the warp beam 1 is also stopped. In this case, the loom is set to stop at a fixed position slightly before beating (for example, 300 degrees), so the total warp tension is lower than the constant value T, for example, the value shown by the two-dot chain line in Fig. 3. And since the total warp tension at this time is less than the maximum friction force applied to the brake plate 10 (dotted chain line in Fig. 3),
Brake plate 10 does not move. Therefore, while the loom is stopped, the weight lever 7 is not displaced, the speed change lever 12 is not rotated, and the warp delivery amount remains unchanged. In addition, since the gear shift lever 12 is connected to the weight lever 7, which is applied with a brake, through the rod 9 in such a manner that there is no mechanical play, the gear shift lever 12 does not move loosely during driving. I have never experienced a situation where the warp feed rate was unstable.

In the above explanation, a fixed value of braking force is applied to the brake plate by the elastic force of the spring 18 regardless of whether the vehicle is running or stopped. The braking force may be applied to the brake plate by the loom, and if necessary, the braking force may be switched to increase when the loom stops, for example, by a stop signal of the loom.

Furthermore, if a damper such as an oil damper is attached to an appropriate position of the weight lever as necessary, the amplitude of high frequency vibration can be more effectively reduced.

As described above, according to this invention, the speed change lever of the warp delivery amount control mechanism is displaced only when there is a tension fluctuation greater than the maximum frictional force caused by the braking force applied to the brake plate, and moreover, Since the speed change lever is connected to the weight lever via the rod 9 so that there is no mechanical play, it is possible to prevent the loom from being damaged by high-frequency vibrations during operation of the loom and to reduce wear on various parts. It is possible to effectively prevent slipping when the speed change lever moves freely during the process and the warp feed amount becomes unstable.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of this invention, and FIGS. 2A to 3C and 3 are explanatory diagrams showing how each part of the embodiment vibrates. 1... Warp beam, 2... Tension lever, 7... Weight lever, 10... Brake plate, 11... Warp delivery amount control mechanism, 12...
Gear shift lever, 13... Brake base, 14...
brake lever.

Claims (1)

[Claims for Utility Model Registration] The warp threads wound around the warp beam are guided to the weaving front via a tension roll, and a weight lever connected to a speed change lever of a warp delivery amount control mechanism is activated in accordance with the displacement of the tension roll. A warp for a loom, which is of a type in which the warp delivery amount is adjusted appropriately by moving the warp, and has a brake mechanism that constantly applies a predetermined value of braking force to the weight lever 7 in a state where the weight lever 7 is prevented from moving. Sending device.