JPH0116599Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a tension adjustment device that can adjust the tension of a plurality of cords running substantially parallel to each other to a predetermined value that hardly differs from each other while the cords are running.

For example, in the tire manufacturing industry, corded rubber sheets reinforced with textiles or steel are used as intermediate materials. This corded rubber sheet is manufactured by crimping rubber onto multiple cords that run on the same plane at equal distances from each other, and the tension of the multiple cords is maintained at a predetermined value without variation. It is necessary to be familiar. Therefore, conventionally, as shown in Fig. 1, resistance is applied to the cord 2 by rolls 1 and 1 in advance, and then the cord 2 is forcibly pulled by rolls 3 and 3, so that the cord 2 is uniformly stretched. A method of applying tension was used.

However, as shown in FIG. 2, for example, two bobbins 5 and 6 are attached at the same time to a generally used fixed creel pin 4 that does not rotate.
When connecting the end 7 of the cord of the bobbin 5 to the tip 8 of the cord of the bobbin 6 for continuous cord pulling,
A large difference in tension will occur when changing to the cord, but if you try to compensate for this large difference in tension using the conventional method as described above, you will have to apply a larger tension to the cord.
There may also be cases where a tension exceeding the allowable value is applied. However, there was a problem in that a cord subjected to such high tension could not withstand practical loads. Furthermore, in the conventional method, there is a problem in that it is difficult to eliminate variations in tension between cords and adjust the tension to be uniform, and a solution to these problems has been desired.

This invention was made in view of the above points, and includes a plurality of rolls that rotate while applying frictional force to a plurality of cords that run parallel to each other, and a plurality of rolls that rotate in the order in which the cords come into contact with each other as the cords advance. The surface speed of the rolls is slowed down, and as the cord comes into contact with multiple rolls, the higher the tension among the cords, the lower the tension, thereby reducing the variation in tension between each cord. a rotation mechanism that rotates the plurality of rolls while correcting the tension so that the tension is uniformly equal to or less than a predetermined value, and a cord that is located behind the plurality of rolls and has a uniform tension equal to or less than the predetermined value. and a tensioning mechanism that applies a tensile force using a mass body so that the tension reaches a certain value, and adjusts the tension to a uniform predetermined tension without applying high tension to multiple cords. It is an object of the present invention to solve the above-mentioned problems by providing a tension adjustment device for a plurality of cords that is capable of adjusting the tension of a plurality of cords.

This invention will be explained below based on the drawings. FIG. 3 is a diagram showing an embodiment of this invention. In the figure, 10a, 10b, 11a, 11b, ... 17a,
Reference numeral 17b is a known bobbin, two of which are attached to each creel pin 18, as shown in detail in FIG. These bobbins 10a, 10
b, 11a, 11b... are each wound with a cord Z, and two bobbins attached to the same creel pin 18, for example 10a, 10
The cord Z wound around b is connected to the end Zb of the cord Z that is pulled out first and the tip Za of the cord Z that is pulled out later, so that it can be pulled out continuously. Further, the creel pin 18 has a structure as shown in detail in FIG. That is, 20 is a frame of the creel stand, 21 is inserted into a hole 22 made in this frame 20, and a seat member 23 and a nut 2 are inserted.
4 is a fixed creel pin fixed to the frame 20 by. Reference numeral 25 denotes a cylindrical rotating creel pin fitted from the distal end 21a side of the fixed creel pin 21 so as to be rotatable around the axis. This rotating creel pin 25 is connected to the bobbin 10a, 10b, 1
It has an outer diameter that allows it to be tightly fitted into the center shaft hole 27 of 1a, 11b, . Further, a substantially cylindrical sliding member 30 made of metal or resin with low frictional resistance and having a flange portion 29 at one end is fitted and fixed to the base end 25b of the rotating creel pin 25. A protrusion 31 having an arcuate cross section is provided on the inner circumference of the sliding member 30, and this protrusion 31 is similar to the same protrusion 31 provided on the outer circumference of the fixed creel pin 21 over the entire circumference. By being slidably fitted into the cross-sectional groove 32, the rotating creel pin 25 becomes integral with the bobbins 10a, 10b... when the bobbins 10a, 10b... attached to the rotating creel pin 25 are pulled out. This prevents it from coming off the fixed creel pin 21. 33 is fixed creel pin 2
The rotating creel pin 25 is attached to the tip of the
This is a bearing that supports the motor from the inside and allows it to rotate smoothly. Due to the rotation of the bearing 33 and the sliding movement of the sliding member 30 with the fixed creel pin 21, the rotating creel pin 25 is moved to the bobbin 10a, 1
When pulling out code Z from 0b... bobbin 10
a, 10b... and when the cord Z is stopped being pulled out, the bobbins 10a, 1
Due to the inertial rotational force acting on the bobbins 10a, 10b, etc., they rotate relative to the fixed creel pin 21 around the axis. 34 is the seat member 23 and the sliding member 30
The creel pin 21 is fixed between the flange portion 29 of the
This is a friction cushion member made of urethane foam, felt, etc. that is attached to the This cushion member 34 is provided to apply a predetermined rotational frictional resistance to the rotating creel pin 25 via the sliding member 30 in sliding contact with it, and to apply an appropriate tension to the cord Z pulled out from the bobbins 10a, 10b... It is something. The pressing force of the cushion member 34 against the sliding member 30 is applied to the seat member 23 and the nut 2.
This can be adjusted by adjusting the amount of screwing into the fixed creel pin 21 of No. 4, thereby making it possible to adjust the rotational frictional resistance given to the rotating creel pin 25. Returning to FIG. 3, 36 is the bobbin 10a, 10b, 11a.
37 is a metal support rod arranged to provide resistance to the cords Z pulled out in parallel to each other to prevent them from getting entangled. It is a reed made of boards arranged in the shape of a comb. 38 is a guide roll;
1, 42, 43, 44, and 45 are cylindrical rolls rotatably supported by a frame (not shown). These rolls 41, 42, .
(preferably above 100%).
Further, it is preferable that each of the rolls 41, 42, . . . , 45 has a uniform friction coefficient and roll diameter over the entire circumferential surface, is resistant to change over time, and has a diameter as large as possible (100 mm or more). 47 is a gear provided on the output shaft of a speed reducer (not shown) connected to the output shaft of a motor (not shown);
This gear 47 and each of the rolls 41, 42...45
Gears 41a, 42a...45 provided at the ends of
A chain 51 is spanned between the rolls 41, 42, .
It constitutes a mechanism 52 for rotating 45. Each of the rolls 41, 42...45 is arranged at a constant ratio by changing the number of gear teeth or changing the roll diameter, so that the surface speed of the rolls arranged later in the direction of movement of the code Z is constant. The tension of the cord Z is made uniform below a predetermined value by slowing down the tension. 55 is arranged behind each of the rolls 41, 42...45,
A weight (mass body) serves as a tension applying mechanism that applies a tensile force to each cord Z having a uniform tension of a predetermined value or less so that the tension becomes a predetermined value, and 56 is a guide roll.

Next, the operation of the tension adjusting device for a plurality of cords having the above configuration will be explained. Thousands of cords Z pulled out in substantially parallel lines from the bobbins 10a, 10b, 11a... attached to the creel pins 18, 18... 37 and are aligned at a predetermined distance from each other. After passing through a guide roll 38, the first roll 41 is passed. At this time, the tension of each cord Z is not constant, and among the multiple cords Z, the cord with higher tension is placed on roll 4.
The contact pressure to 1 is high. Further, a cord with low tension has a low contact pressure with the roll 41. Therefore, a cord with high tension is fed more than a cord with low tension. However, as described above, the surface speed of the next second roll 42 is slower than the surface speed of the first roll 41, so the amount fed by the second roll 42 is smaller than the amount fed by the roll 41. The amount will be less than the amount fed in. For this reason, roll 4
The tension of the cord is absorbed between 1 and 42, and the more tension the cord is fed by the first roll 41, the lower the tension. Also, the cord with low tension is
Since the pressure in contact with the roll 41 is low, the cord with higher tension is not fed in as much and the amount of tension absorbed is small.
Next, each cord Z fed by the second roll 42 is passed between the second roll 42 and the third roll 43 whose surface speed is slower than the third roll 43, as described above, the higher the tension, the lower the tension. descend. A similar action is performed between the third roll 43 and the fourth roll 44, and between the fourth roll 44 and the fifth roll 45.

In this way, the tension of the high-tension cord decreases as it passes through each roll, and its tension approaches that of the low-tension cord. That is, variations in each code are corrected between the first roll 41 to the fifth roll 45. Each cord Z that has passed through the fifth roll 45 has a uniform tension at a value lower than the final required value. Next, these codes Z have a weight of 55
After applying tension evenly by and adjusting to a predetermined final tension, it passes through a guide roll 56,
In the next step (not shown), rubber is crimped and processed into a corded rubber sheet.

In addition, since the creel pin 18 rotates together with the rotating creel pin 25 and two bobbins attached thereto, for example, 10a and 10b, the cord Z to be pulled out is connected to one bobbin 10a.
There is little variation in tension when moving from one bobbin to the other bobbin 10b, but in a general fixed creel pin as shown in Fig. 2, where the creel pin does not rotate together with the bobbin, the cord moves from one bobbin to the other bobbin. Large fluctuations in tension occur when moving to However, such a large difference in tension can be sufficiently absorbed by the device described above.

Further, the final tension of each cord Z is the final tension of each cord Z.
1, 42, 43... diameter, rolls 41, 42,
By appropriately setting the winding angle of the cord Z on 43..., the number of winding stages (number of rolls), and the surface speed ratio between each roll 41, 42, 43..., it can be adjusted to an arbitrarily low value. is possible.

Furthermore, each code Z has a creel pin 18...
Among the two bobbins 10a, 10b, 11a, 11b... attached to each of the bobbins, one bobbin, for example, the bobbin 10a, becomes empty and is removed from the rotating creel pin 25, and the other bobbin 10b also has a remaining amount. When the cord Z is running low, the bobbin 10b is temporarily removed from the rotating creel pin 25 while the cord Z is still being pulled out, and is attached to another creel pin (not shown), and the end of the cord Z that is being pulled out is newly prepared. By repeating the process of connecting both bobbins to the tip of the cord of a new fully wound bobbin (not shown) and attaching them to the rotating creel pin 25 first, the new fully wound bobbin can be connected to the tip of the cord Z for bobbin replacement. The code Z can be sent out continuously without stopping the sending out.

As explained above, according to this invention, the tension adjustment device for a plurality of cords includes a plurality of rolls that rotate while imparting a frictional force to a plurality of cords running substantially parallel to each other, and a plurality of rolls that rotate while applying frictional force to the cords that run in parallel with each other. The surface speed of the plurality of rolls decreases as the cord comes into contact with the plurality of rolls, and as the cord comes into contact with the plurality of rolls, the tension of the cord with higher tension decreases. a rotation mechanism that rotates the plurality of rolls while correcting the variation in tension between them so as to be uniform to a predetermined value or less; and a rotation mechanism located behind the plurality of rolls;
Since the structure is equipped with a tension applying mechanism that uses a mass body to apply a tensile force to the cords having a uniform tension equal to or less than the predetermined value so that each cord has a uniform tension of the predetermined value, the cord is not subjected to large tension. The effect is that variations in tension between the cords can be removed without applying any tension, and the tension can be made uniform to an arbitrarily low level.

Furthermore, by using the creel pin 18 shown in the above embodiment in combination, it is possible to continuously feed out the cord without stopping to replace the bobbin, and the two bobbins attached to the creel pin can be integrated into one body. Since the cord rotates in a circular motion, the cord connected between both bobbins does not become loose and wrap around the creel pin when the cord is started or stopped, resulting in a significant improvement in work efficiency. .

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of the conventional method of adjusting the tension of multiple cords, Fig. 2 is a partially sectional front view showing the state in which two bobbins are attached to a fixed creel pin, and Fig. 3 The figure is a schematic explanatory diagram showing the configuration of an embodiment of the tension adjustment device for multiple cords according to this invention, and Figure 4 shows a bobbin attached to a rotary creel pin that can rotate two bobbins together. FIG. 5 is a front sectional view of the rotary creel pin shown in FIG. 4. Z...Code, 41, 42, 43, 44, 45
...Roll, 52...Roll rotation mechanism, 55...
Weight (mass body) as a tension applying mechanism.

Claims (1)

[Scope of utility model registration request] A device that adjusts the tension of a plurality of cords running substantially parallel to each other to a predetermined value, and includes a plurality of rolls that rotate while applying frictional force to the cords, and a plurality of rolls that rotate the cords in the order in which they come in contact with each other as the cords advance. The surface speed of the roll should be slow,
As the cord comes into contact with multiple rolls, the higher the tension among the multiple cords, the lower the tension, so that the variation in tension between each cord is corrected to be uniform below a predetermined value. a rotation mechanism that rotates the plurality of rolls, and a cord located behind the plurality of rolls and having a uniform tension of not more than the predetermined value, by a mass body so that the tension is uniformly equal to the predetermined value. A tension adjustment device for a plurality of cords, comprising: a tension applying mechanism that applies a tensile force to a plurality of cords.