JPS6036637Y2 - hose braiding machine - Google Patents

Description

[Detailed description of the invention] The present invention relates to a braiding machine for forming a stable braided layer uniformly and at high speed in a braiding machine for knitting a braided layer of fiber yarn or the like into a tubular shape as an intermediate reinforcing layer of a hose or the like. It is something.

Generally, as shown in FIG. 1, a braiding machine has a mechanism in which a carrier 3 revolves by crossing two annular meandering guide grooves 2 provided on a plywood surface 1 in different directions.

As shown in FIG. 2, a very commonly used carrier includes a first guide 6 in which a thread 5 wound around a bobbin 4 attached to a bobbin mast 19 is fixed to an auxiliary mast 8, and a main mast 8. They pass through the second guide 10 fixed to the slider 13 that slides the main mast 9 and the auxiliary mast 8, and then pass through the third guide 12 fixed to the cap 11 that sets the main mast 9 and the auxiliary mast 8, and gather at the center of the braiding machine. It has a mechanical structure and runs with the main mast at the beginning.

Further, the tension of the yarn 5 is adjusted as follows during the process of being unwound from the bobbin 4 and gathering at the center of the braiding machine.

That is, when the thread 5 is pulled out from the third guide 12 of the carrier, the slider 13 slides above the main mast 9 while compressing the main spring 14 loosely fitted to the main mast 9.

Then, the auxiliary mast 8 slides and the slider 13 comes to the point where it lifts the rod lever 16, which is pressed down by the return spring 15 loosely fitted to the auxiliary mast 8 (point marked → in the figure). (Part a of the slider 13 and part b of the rod lever 16 are in contact) Rod lever 1
The gourd lever 17 connected to the bobbin 4 is disengaged from the ratchet wheel 18 of the bobbin 4, and the bobbin 4 is rotated to the left by one tooth of the ratchet wheel 18.

When the bobbin 4 rotates and the thread 5 is paid out, the thread tension is relaxed and the slider 13 slides downward.At the same time, the rod lever 16 is pushed downward by the return spring 15, and the gourd lever 17 is moved by the ratchet wheel 18. The l dentary engages the teeth rotated to the left.

By repeating the above steps, the yarn 5 is not unrestrictedly let out from the bobbin, but is adjusted to an appropriate tension and pulled out from the carrier.

The ratchet wheel 18 shown in FIG. 2 freely rotates to the right, but cannot rotate to the left unless the gourd lever 17 is removed from the ratchet wheel 18.

From now on, the ratchet car in this state will be called a ratchet car that rotates freely to the right, and vice versa.

By the way, in conventional braiding machines, the direction of rotation of the bobbin attached to the carrier is the same regardless of the running direction of the carrier.

That is, the carriers are designed to have a mechanism in which the direction of rotation of the bobbin is the same when the yarn is pulled out from the bobbin, whether the carrier revolves counterclockwise or the carrier revolves clockwise.

According to the experience of the inventors, when using a braiding machine with such a mechanism, there is a disadvantage that the tension of the yarn pulled out from the carrier is different depending on the counterclockwise carrier and the clockwise carrier. If a large amount of bobbin is attached to a carrier and braided, the braided tube may be twisted, the braided layer may not be tubular but polygonal, and the stitches of the braided layer may be uneven. It is recognized that this results in a decrease in pressure resistance, resulting in extremely unfavorable results for the performance of the braided pipe.

Moreover, when braiding low-strength yarn due to pipe performance requirements, yarn breakage occurs frequently only in carriers that revolve in one direction.
In order to prevent this, the current situation is that the number of revolutions of the carrier must be lowered in order to be able to braid it, which has the disadvantage of reducing production speed and increasing manufacturing costs. It has been recognized that there is a tendency for breakage and damage to occur.

The reason for this is that the tension f of the yarn pulled out from the carrier
The inventors found that this is due to large fluctuations in .

That is, the yarn tension f is generated when the spring force f1 and the carrier change the traveling direction from inward (toward the center of the bed plate) to outward (towards the center of the bed plate) on the annular meandering path, or The force f caused by the inertia difference between the bobbin and the carrier body when changing direction inward from
2 and the carrier move along the annular meandering path from the inside (path on the center side of the base plate) to the outside or from the outside to the inside, and the distance between the hose stitch (the point where the yarn is knitted around the outer circumference of the pipe to be processed) and the carrier increases. It was confirmed that it is equal to the sum of the force g generated due to the change.

(f = f1 + f2,000 g) In this case, f2 and g can be almost ignored when the carrier revolves at low speed, but as the speed increases, the ratio of f2 and g to f increases.

Here, Figure 3 shows the traveling direction of the carrier of the conventional braiding machine (
This is a schematic diagram showing the relationship between the rotation direction of the bobbin, each position of the carrier, and the thread tension.The A carrier revolves to the left on the annular meandering path, and the B carrier revolves to the right.

The bobbins attached to both carriers A and 8 rotate to the left when yarn is unwound from the bobbins.

Therefore, in this case, both carriers A and B are equipped with a right-handed free rotation ratchet wheel.

In the figure, the solid line arrow indicates the direction of rotation of the bobbin when the thread is pulled out from the bobbin, and the broken line arrow indicates the direction of free rotation of the bobbin and ratchet wheel.

In this case, if we look at the change in the tension of the yarn for carrier A, f and □ are the same no matter where the carrier is located in the annular meandering guide groove 2 due to the force of the spring.

On the other hand, regarding fa2, at the position @ in Figure 3, the carrier body changes its traveling direction from inward to outward, that is, to the right, and the bobbin is centered around the carrier body due to inertia. If you look at it, it will try to rotate to the left.

(Rotation direction of the solid line arrow in the figure) However, since the ratchet wheel of the carrier A rotates freely to the right as described above, the gourd lever engages with the teeth of the ratchet wheel, and no inertial shift occurs between the bobbin and the carrier body.

However, at position 8, the carrier main body changes its direction of movement to the left, and the bobbin tends to rotate clockwise when viewed from the carrier main body due to inertia.

(Rotational direction of the broken line arrow in the figure) Since this ratchet wheel rotates freely to the right, the thread is wound around the bobbin, and is added as part of the tension of the thread.

Next, regarding the diameter, ga is maximum at the position ■O where the distance between the carrier and the hose eccentricity is the longest, and is minimum at the position @ where it is the shortest.

Therefore, when the tension applied to the yarn is composed of fa□ and fa29gb, the difference between the maximum tension and the minimum tension of the yarn increases as in fa.

Next, regarding the B carrier, fbl is constant like the A carrier, and fb2 is at the position 8, so that no inertial shift occurs between the bobbin and the carrier body for the same reason as the A carrier.

However, at the @ position, the yarn is wound onto the bobbin, and fb2 is added as part of the yarn tension.

gb is maximum at the ■G position and minimum at the @ position.

fb. When fb29gb is synthesized, the tension fluctuation of the yarn is smaller than that of A carrier like fb.

In this way, there is a large difference in the amplitude and maximum tension in the tension of the yarn drawn out from both carriers A and B.
This results in disadvantages such as damage to the braided tube, the braiding process, or the braiding machine as described above.

When the speed is further increased or the amount of bobbin winding is increased, the above-mentioned f2 greatly affects the tension of the yarn.

In order to reduce the influence, it is necessary to reduce the amount of thread wound, and as a result, the frequency of untied threads increases, which is an undesirable drawback in terms of manufacturing control.

In view of the above-mentioned points, the present invention aims to provide a braiding machine capable of forming a uniform and stable braided layer even at high speed and when the bobbin winding amount is large. As shown in the figure, two annular meandering guide grooves 2 are formed on a plywood surface 1 on a large number of carriers 3 that orbit each other while intersecting each other in opposite directions. The ratchet wheel 18 rotates freely.
The bobbin 4 is attached to each ratchet wheel, and when the pawl lever and the ratchet wheel are disengaged by increasing the tension of the thread being pulled out from the bobbin, the bobbin moves in the opposite direction to the free rotation direction of the ratchet wheel. The threads are sequentially pulled out while rotating, and the threads are gathered at the center of the plywood surface and are sequentially knitted around the outer periphery of the braided tube that is pulled out through the center of the plywood to form a tubular braided layer. In this braiding machine, the ratchet wheels on the right revolving carrier and the left revolving carrier are respectively set as a ratchet wheel that freely rotates in the right direction and a ratchet wheel that freely rotates in the left direction, and each bobbin is It is characterized in that the direction of rotation and the direction of revolution of the carrier are opposite to each other.

An embodiment of the present invention will be described in detail below with reference to FIG.

Figure 4 shows that the C carrier revolves to the left in the annular meandering guide groove 2, the bobbin attached to the C carrier rotates to the right as the yarn is pulled out from the bobbin, and the D carrier rotates to the right. It revolves, and the bobbin of the D carrier rotates to the left.

FIG. 3 is a simulation diagram showing the relationship between the carrier traveling direction and the rotation direction of the bobbin and the relationship between yarn tension at each position of the carrier according to the present invention.

The C carrier is equipped with a ratchet wheel that freely rotates on the left, and the D carrier is equipped with a ratchet wheel that freely rotates on the right.

Further, the annular meandering guide groove 2 is a developed view of the broken line portion in FIG. 1, and the lower part in the figure is the direction toward the center of the plywood surface.

First, for the C carrier, fcm is the same regardless of the position of the carrier in the annular meandering guide groove due to the force of the spring.

At fc2, the direction of movement of the carrier changes to the left at the CO position in FIG.

Also, due to inertia, the bobbin tends to rotate in the right direction when viewed from the carrier body (rotation direction indicated by the solid line arrow in the figure).

However, since the ratchet wheel of the C carrier rotates freely to the left, the gourd lever engages with the teeth of the ratchet wheel, and no inertial shift occurs between the bobbin and the carrier body.

However, at the @ position, the direction of movement of the carrier changes, and the bobbin tends to rotate to the left when viewed from the carrier body due to inertia (rotation direction indicated by the dashed line arrow in the figure), and the ratchet wheel rotates freely to the left. The yarn is wound onto the bobbin, and this fc2 is added as part of the tension of the yarn.

Next, gc becomes maximum at the position ■0 and minimum at the position @ for the reason stated earlier.

fc,, fc2. When GC is made of synthetic leather, the fluctuation in yarn tension becomes smaller like FC.

Next, for the D carrier, fdl is constant like the C carrier, and fa2 is at the @ position in FIG. 5 for the same reason as the C carrier, so that no inertial shift occurs between the bobbin and the carrier body.

However, in the position ■O, the yarn is wound onto the bobbin as described previously, and fa2 is added as part of the tension of the yarn.

gd is maximum at the @ position and minimum at the ■8 position.

fdl, fa2. When GD is made of synthetic leather, it becomes D like FD.
The fluctuation range of the carrier yarn tension is small, and the absolute tension is uniform.

Therefore, the fluctuation width of the yarn tension between the C9D carriers is small and the same, and there is no difference in the absolute tension. According to the braiding machine of the present invention, the drawbacks of the conventional braiding machine do not occur at all.

Therefore, not only the number of carrier revolutions can be doubled, but also the amount of bobbin thread winding can be increased.

The differences between the conventional example and the example of the present invention when braided under the following conditions around the outer periphery of a soft vinyl chloride pipe with an outer diameter of 23 m/m and a wall thickness of 2 m and 1 m using a braiding machine are as follows.

Braiding conditions ■ Main spring 1000! 9 2 Return spring 200g 3 Thread is nylon filament thread 1260D/1
4 Number of carriers One direction 16 reverse direction 1
6 pieces 5 Knitting angle (angle between the axis of the pipe to be processed and the yarn) 54 degrees 4
With a conventional braiding machine, the carrier revolves at a rate of 15 times per minute, which causes twisting in the braided processed tube and uneven stitches, but with the braiding machine devised by Tai-Koshimoto, the carrier Even at a revolution speed of 32 revolutions/minute, a well-processed tube without twisting or thread misalignment can be obtained, and the bobbin winding amount is 300 g with a conventional braiding machine, but 700 y with the braiding machine of the present invention. Even when the weight was increased to 800 g, a braided pipe with good appearance and quality was obtained.

Further, according to the present invention, since the fluctuation range of the tension of the yarn is small, no impact force is applied to the carrier or the base plate, and damage to the machine is drastically reduced.

A bobbin is attached to only one of the carrier 32 ice, and the braiding machine is operated at the carrier revolution number and the thread withdrawal speed from the bobbin shown in the table below, and the tension of the thread that is drawn out is determined by the braiding machine of the present invention and the conventional braiding machine. Braiding machines were measured and compared.

Operating conditions: Main spring 1000g Yarn // 20011 Yarn nylon 1260d / 1 bobbin winding amount Invention braiding machine 700g Conventional 〃300y With a conventional braiding machine, as the number of revolutions of the carrier increases, the maximum tension mentioned above becomes too large. Therefore, there were many cases of damage mainly to the bobbin mast, guide, slider, etc. Breakage of the bobbin mast in particular had the fatal result of having to discard the carrier itself.

However, with the braiding machine of the present invention, no breakage of the bobbin cloak occurred, and damage to sliders, guides, etc. was drastically reduced, and great effects and benefits were exhibited in terms of maintenance and maintenance of the braiding machine.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the relationship between the baseplate annular meandering guide groove and the carrier in a braiding machine, Fig. 2 is a detailed front view of a portion of the carrier, and Figs. 3 and 4 show the carriers of the conventional product and the present invention. 3 is a schematic diagram showing the relationship between the running direction (rotation direction) and the rotation direction of a bobbin attached to the carrier, and the relationship between each position of the carrier and thread tension; 1 is plywood; 2 is a carrier guide groove; 3. A, B, C, D
indicates a carrier.

Claims (1)

[Scope of utility model registration request] A ratchet wheel is mounted on a large number of carriers that revolve around two annular meandering guide grooves intersecting in opposite directions on the plywood surface, and that rotates freely in only one direction by engaging with an individually provided pawl lever. However, when a bobbin is attached to each ratchet wheel and the pawl lever and ratchet wheel are disengaged due to an increase in the tension of the yarn being pulled out from the bobbin, the bobbin rotates in the opposite direction to the free rotation direction of the ratchet wheel. The yarns are sequentially pulled out from the base plate, and while gathering at the center of the base plate surface, the yarns are sequentially knitted around the outer periphery of the tube to be braided which is pulled out through the center of the plywood to form a tubular braided layer. In a braiding machine, the ratchet wheels on the right revolving carrier and the left revolving carrier are respectively a ratchet wheel that freely rotates to the right and a ratchet wheel that freely rotates to the left. A braiding machine characterized in that the direction of rotation and the direction of revolution of the carrier are opposite to each other.